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Location:
Sydney
Registered:
March 2003
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Who said 7M, had no potential??
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Mon, 29 March 2004 12:15
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BLC-JET MA70 Supra 
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Mon, 29 March 2004 14:03
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7m going to 8800 rpm? 
hmmmmkhay...
impressive figures none the less. any specs?
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Location:
Sydney
Registered:
February 2003
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Re: Who said 7M, had no potential??
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Mon, 29 March 2004 14:20
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dug up and article from fast fours when this car was making 565kw@8100 and 12.48@133mph.
Internals: block: decked; torque plate bore and hone with plateau brush; i beam rods; rod bolts; floating forged pistons; gapless rings; head and mains studs; crank been stress relieved, cross drilled, tuftrided, index ground; heavily modded oil pump. Head: hardened and annealed; standard valves with seven angle seats, pleanty of porting, aftermarket cams, trd valve springs, hks 1.0mm mhg, 8.5:1 CR
Induction: ta51 garret, custom tube and fin cooler, custom 10 litre plenum with bell mouths, 3inch cooler piping, 4 litre surge tank, holley 15psi pre pump, 2x044 bosch pumps, 1/2in feed fuel line, 3/8in return line, 1000cc injectors, malpassi fuel pressure reg.
Management: motec m48, 5 core radiator
Exhaust: port matched, tuned length, twin entry, split pulse manifold, 45mm external gate, 3.5in turbo to cat, 3in cat to tip, 3.5in cat, single 3in muffler
Drivetrain: Supra 5 speed, triple plate clutch, standard diff, 3.5in tailshaft, standard brakes
Suspension: bilstein struts with 3in lowered kings
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Location:
Adelaide
Registered:
September 2003
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Re: Who said 7M, had no potential??
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Mon, 29 March 2004 22:16
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| STR8 2.8 wrote on Tue, 30 March 2004 00:20 |
, standard brakes
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Some people just don't get it do they ????
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Location:
Adelaide, SA
Registered:
May 2002
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Location:
Girraween,Sydney
Registered:
September 2003
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 00:25
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Any one got pics of the car??
Cheers,
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Location:
Adelaide
Registered:
September 2003
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 02:00
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| lumpy wrote on Tue, 30 March 2004 09:37 |
| bbaacchhyy wrote on Tue, 30 March 2004 07:46 |
| STR8 2.8 wrote on Tue, 30 March 2004 00:20 |
, standard brakes
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Some people just don't get it do they ????
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Hey man didn't you read it's got lowered kings springs! At least the suspension is sorted 
All that power and only a 12.48 second timeslip. Since it's got a manual gearbox, I guess it's not meant to be a drag car... but what was it built for? Completely mad street driving?
and standard diff still hanging on? - Go the almighty G-series!
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Correct, King springs sort out everything 
all that grunt and only 12.48 - musn't be able to drive that well. Norbs gets close to that and he has less power and crappy tires !!!!!
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 02:01
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yeah
norbie's is in a car that weighs 300kgs less tho 
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Location:
Adelaide
Registered:
September 2003
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 02:13
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| draven wrote on Tue, 30 March 2004 12:01 |
yeah
norbie's is in a car that weighs 300kgs less tho
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I still doesn't have anywhere near 650 rwkW though !!!!
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Location:
Brisbane
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 03:51
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| bbaacchhyy wrote on Tue, 30 March 2004 12:00 |
all that grunt and only 12.48 - musn't be able to drive that well. Norbs gets close to that and he has less power and crappy tires !!!!!
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Exactly what I was thinking. My launch was woeful (2.7 60ft) so this guy must have truly sucked getting it out of the hole!
Still, the trap speed says it all: 117mph vs 133mph.
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Location:
Ballarat, Vic.
Registered:
September 2002
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 04:43
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ive got pics but i need to resize them, i'll put them up later in the day
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Location:
Sydney
Registered:
March 2003
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 06:02
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Trap speed indicated hi 10's right??
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Location:
Adelaide
Registered:
June 2002
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very interesting............
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Tue, 30 March 2004 06:19
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AH HA-The 7m is a great motor-but as we all know there is the ever present bone of contention associated with them "The Head Gasket Issue".
It is something that has always bugged me about the 7M, and all the m series. I know some stalwarts will say there isn't a problem-but the reality is that they do blow far more regularly than other motors. Having a look at the bolt spacings and general arrangement of the head, there doesn't seem to be any obvious reason for it, however something I have found with the 5M/4M heads in particular is that they have a tendency to go "soft". This seems to happen when the engines get a bit warm and screw up the temper. In the 5M's you can see it easily as the posts on the head where the rocker gear mounts begin to squash/collapse. This can be fixed but it requires someone capable of properly annealing and hardening the head again. (very few places are capable of this properly.) I have often wondered if this problem is common to the later M's (it would be assuming the same metal was used.)
The reason I say this is because in the specs of the motor posted earlier it mentions a "hardened and annealed" head. Perhaps this has remedied the gasket problem. To me, this points to the M's being flawed not by design, but perhaps a poor material selection. Maybe this is the root of the problem and by hardening and annealing it eliminates the problem. They obviously have some success (a slight understatement...)considering the boost levels it's running.
What do you guys think?
Sean
Damn inpressive motor!!!!
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Location:
Perth
Registered:
May 2003
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 06:30
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i think someone stole the 4m out of my car 
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Location:
Brisbane
Registered:
May 2002
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Re: very interesting............
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Tue, 30 March 2004 06:58
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| MS-75 wrote on Tue, 30 March 2004 16:19 |
What do you guys think?
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I think you could be onto something there! I've heard similar stories about earlier Toyota engines (eg 18R-G) having soft alloy which doesn't take too well to overheating. It would be interesting to find out exactly what material they used in the later M series engines and what they used in the JZ engines, which of course don't have the same headgasket problems.
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Registered:
August 2002
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 07:06
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Surely it may also be a combination of issues that all helped to create the problem. Not just one symptom on its own?
- 2JZ has a greater space between cylinder bores (7m was a bored out 2L was it not?)
- 7M was prone to poor flow in the water jacket in cyl 6 and corrosion / use of non red coolant also effected this area.
- Head gasket wasnt torqued down enough
- 2JZ also uses a metal gasket.
And as sean mentioned above, the material used.
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Location:
UK at moment
Registered:
May 2003
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 09:15
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I just cannot believe only a mid 12 second time with that sort of power.. I wonder what it would make on another dyno.
Must be making decent power though - to get 133mph, but 565rwkw is a whole lot of grunt.. hmm.
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Registered:
March 2004
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 09:36
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trap speed and engine power say low-10's. im hoping that it was run with street tyres and lots and lots of wheel spin. if it was done with slicks  
but anyway it is a VERY nice supra and with 565rwkw it would be awsome to drive around a track or outback NT mmmmmmmm boost wonder how long the diff is doing to last him??
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Location:
Castlemaine Vic
Registered:
November 2002
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Re: Who said 7M, had no potential??
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Tue, 30 March 2004 11:32
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a quote from fast fours...
"As the standard diff was proving to be a problem. Nik lowered the boost to 25psi and just drove the car off the line (2.89 60ft) to record a 12.48 at 133mph. "im confident the car can run a high 9, low 10 at 140mph as is. I only just pulled fourth gear across the line so the gearing is needs some attention. at the time of writing the diff was being rebuilt with a new 4.8:1 center and thicker driveshaft axles."
pretty sure it says somewhere in the article that they welded the stock diff too...of was that in the yellow "I8A4RE" ? bah i dunno, just hope BLC JET is at melb auto salon on the weekend
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Registered:
April 2004
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Re: Who said 7M, had no potential??
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Thu, 01 April 2004 05:03
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hey all, since this is my 1st post id better make it a usefull one.
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Location:
Sydney
Registered:
June 2003
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Re: Who said 7M, had no potential??
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Thu, 01 April 2004 05:08
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Saw that one at the car show. Cannot say I was expecting to see a Mk III but was nice to see. Looks like he has done a little more work since then as before the power graph was painful to see.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Thu, 01 April 2004 05:11
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Where's the air-filter? Surely he's not driving around without one?
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Thu, 01 April 2004 05:50
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| lumpy wrote on Thu, 01 April 2004 13:11 |
Where's the air-filter? Surely he's not driving around without one?
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Correct, just a big bellmouth on the turbo inlet instead.
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Location:
Perth
Registered:
May 2003
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Re: Who said 7M, had no potential??
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Thu, 01 April 2004 05:52
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| lumpy wrote on Thu, 01 April 2004 13:11 |
Where's the air-filter? Surely he's not driving around without one?
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stick your finger in and find out
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Location:
Adelaide, SA
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Thu, 01 April 2004 06:34
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Perhaps Sean could post a few comments about the merits of driving around without an air-filter.
Yes I know it's just a bellmouth in the photo's! I wonder if it gets driven anywhere like that - or if it had an airfilter on when doing the dyno run.
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Location:
Brisbane
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Thu, 01 April 2004 06:36
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Most dedicated drag cars run with no filter. The engines aren't built to last anyway so sucking in a bit of dirt is unlikely to make any difference.
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Thu, 01 April 2004 10:08
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| Norbie wrote on Thu, 01 April 2004 16:36 |
.....The engines aren't built to last anyway.......
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....and it's only a 7M anyway....
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Location:
Brisbane
Registered:
June 2003
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Re: Who said 7M, had no potential??
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Sat, 03 April 2004 10:10
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i hope you dont really mean that dave!
That's seb's supra...its videos are on fullboost.com.au
He used to have 532rwkw, but a shitty torque curve
Went back to 485rwkw, very nice torque curve
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Location:
Melbourne
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Sun, 04 April 2004 11:19
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| gianttomato wrote on Thu, 01 April 2004 20:08 |
| Norbie wrote on Thu, 01 April 2004 16:36 |
.....The engines aren't built to last anyway.......
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....and it's only a 7M anyway....
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Well he can rest easy at least his dipstick wont fall out.. hey dave??? 
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Sun, 04 April 2004 12:39
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| Norbie wrote on Thu, 01 April 2004 16:36 |
Most dedicated drag cars run with no filter. The engines aren't built to last anyway so sucking in a bit of dirt is unlikely to make any difference.
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hehehehe, dedicated drag car... heehehe... 12.5sec quater... hehehehe...
i reckon my dog could race it competitively down the first 200yards based on that output curve... dyno queen
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Sun, 04 April 2004 13:20
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| Allan wrote on Sun, 04 April 2004 21:19 |
Well he can rest easy at least his dipstick wont fall out.. hey dave???
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As you know Al, the dipstick popped out because the breather was connected to a sealed cannister. It also wasn't in the standard position.
And it makes 6 rwkW more than your modified turbo in NA guise.
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Location:
Canberra
Registered:
August 2002
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Re: Who said 7M, had no potential??
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Sun, 04 April 2004 13:46
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| ed_ma61 wrote on Sun, 04 April 2004 22:39 |
| Norbie wrote on Thu, 01 April 2004 16:36 |
Most dedicated drag cars run with no filter. The engines aren't built to last anyway so sucking in a bit of dirt is unlikely to make any difference.
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hehehehe, dedicated drag car... heehehe... 12.5sec quater... hehehehe...
i reckon my dog could race it competitively down the first 200yards based on that output curve... dyno queen
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lol untill it makes boost and sucks ur dog thru that monster turbo
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Location:
Melbourne
Registered:
May 2002
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Re: Who said 7M, had no potential??
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Sun, 04 April 2004 16:18
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| gianttomato wrote on Sun, 04 April 2004 23:20 |
| Allan wrote on Sun, 04 April 2004 21:19 |
Well he can rest easy at least his dipstick wont fall out.. hey dave???
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it makes 6 rwkW more than your modified turbo in NA guise.
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I think 120,000 hard boosted Km has taken its toll on my poor ol soopie' ahhh well chuck another 2000 on that next weekend, and we will see where that 6kw difference is next year with a fresher 7m 
Drag ya to dubbo
Allan
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Location:
northgate@brisbane.qld.au
Registered:
July 2003
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Re: Who said 7M, had no potential??
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Sat, 10 April 2004 00:03
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jesus christ, that turbo looks like it'd suck harder than a Valley hooker!
thats one niiice supra
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Location:
Brisbane
Registered:
November 2002
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Re: Who said 7M, had no potential??
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Sun, 11 April 2004 03:12
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Who said 7M, had no potential?
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I don't think many people say that - I think you'll find people just bag it for the amount of money (comparitively) to achieve good, reliable results.
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and standard diff still hanging on? - Go the almighty G-series!
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Don't quote me on this, but I believe this may be the one that shattered a diff on it's first drag meet a few years ago.
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all that grunt and only 12.48
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Pay less attention to the ET and more atention to the MPH. Cars like that are notoriously hard to drive. On slicks it is hard to get the confidence to get right into it straight away, and without slicks it is hard to control the wheelspin. Either of these two scenarios, or even just a series of 'shakedown' passes, would explain a slow ET and huge MPH.
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Trap speed indicated hi 10's right??
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Yep.
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2JZ has a greater space between cylinder bores
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Have you actually measured this yourself, or are you just guessing? I agree that the bore on the 7M is huge, but from memory the actual spacing of the bores is actually very similar on the 7M and 1JZ/2JZ engines.
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thats one niiice supra
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I actually think it's one of the ugliest things I've ever seen. But hey, I drive a Corona
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