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Location:
Brisbane
Registered:
June 2003
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Better motor to hot-rod?
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Wed, 14 July 2004 07:59
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A question regarding Cams and the appropriate engine design for me wanting to blow one of my 7mge's. Heres the two options:
A 7mge out of cressida, with the lower rpm orientated cams and intake ports, or ;
A 7mge out of a supra, with the split intake ports and its rpm/ sporty spec cams?
One would think for a blower, the more bottom end grunty cams in the cressida motor would be better for playing around with? Seeing as blower isnt so reliant on rpm to work.
Just an idea, as i have a mx83 motor in my garage that cost me very little, and seems to be in fine nic. I wouldnt mind stripping it down and making a ma70 "coupla year" project.
Computer for running this, would i need a Motec or is there something a little less expensive i could use?
Note: NO, I dont want a turbo.
For Hp figures, id like around 300-320hp at the flywheel.
[Updated on: Wed, 14 July 2004 08:01]
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Location:
Brisbane
Registered:
May 2002
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Re: Better motor to hot-rod?
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Wed, 14 July 2004 08:18
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It would be interesting to find out the lift and duration (such as Ed did) on both cams (did Ed do the MA70 or MX83 cams?) and see how large the difference in fact is 
(I guess you could always swap the cams and dyno as well, but setting up the shims would be painful, for what I suspect would be little gain...)
Also where do you plan to mount the SC? What type of SC? Plan to run 7M-GTE injectors? Intercooler? By the time you come to sorting out the ECU side of things, Ultra Mega Squirt should be out, which looks like it will be fantastic (start sucking up to charles!).
Cheers
Wilbo
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Location:
Brisbane
Registered:
June 2003
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Re: Better motor to hot-rod?
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Wed, 14 July 2004 08:26
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no intercooler. Not a neccessity really.
Mount the Sc at the front of the motor, a Vortech style one.
That is "if" when i do more research and measuring, an eaton one sitting on the side of the motor cant fit. As these are a lot cheaper.
Injectors would be the 1uzfe job id imagine. 400cc should do 
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Location:
Brisbane
Registered:
June 2003
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Re: Better motor to hot-rod?
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Wed, 14 July 2004 08:33
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out of interest, if youre reading..how many hp did you achieve ed?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: Better motor to hot-rod?
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Wed, 14 July 2004 08:53
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| V8_MA61 wrote on Wed, 14 July 2004 16:26 |
Injectors would be the 1uzfe job id imagine. 400cc should do
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1uz injectors are 251cc
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Location:
Brisbane
Registered:
February 2003
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Location:
Brisbane
Registered:
June 2003
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Re: Better motor to hot-rod?
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Wed, 14 July 2004 12:52
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Eaton m90's go for $700 everyday..and they're a substantial blower. More than enough for what id be looking at.
Id have to look more into the intercooler thing...But i cant really see it worth the $1000 the cooler itself costs! Its not Hot exhaust driven air like a turbo creates 
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Location:
Brisbane
Registered:
May 2002
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Re: Better motor to hot-rod?
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Wed, 14 July 2004 23:14
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It's a common misconception that superchargers don't "need" intercooling. The heat generated by turbos has almost nothing to do with the exhaust; the inlet charge gets hot because it's compressed. This is high-school physics stuff; have a look at the Ideal Gas Law for starters. This it applies to superchargers as well as turbochargers!
As mentioned above, if you're using a supercharger without lowering the compression, you'd be crazy not to use intercooling. The only way to stop it from pinging would be to run it on rocket fuel, or use fuck-all boost, or retard the timing to buggery. None of these are good options.
Get an intercooler, and it doesn't have to cost you a grand, that's just for the bling brand-name ones. Hell my uber-cooler only cost me $700 and you won't need anything half as big as that! Something like the Aristo cooler I have in my garage would work nicely, and you can pick them up for $200 tops.
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Toymods Vice President
Location:
Sydney
Registered:
May 2002
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Location:
Brisbane
Registered:
June 2003
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Re: Better motor to hot-rod?
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Thu, 15 July 2004 07:59
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fair enough. thanks for telling me that.
Jeez, i thought your ice cube wouldve cost over 1200 norbie!!
What kind of psi could i run without it going nuts? This is with the mentioned intercooler...And what sort of power would i be expecting.
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Location:
Brisbane
Registered:
May 2002
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Re: Better motor to hot-rod?
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Thu, 15 July 2004 23:56
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With intercooling and good tuning (ie NOT stock ECU) I reckon you could safely manage 10psi. Not sure what power you'd end up with (supercharged 7M's aren't exactly common  ) but you'd probably fall somewhere between 250 and 300hp.
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Location:
Brisbane
Registered:
June 2003
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Re: Better motor to hot-rod?
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Fri, 16 July 2004 15:04
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oh, i thought itd be more than 250hp...a whole 50hp isnt really worth the expense...so i might just do similar work to eds. Thanks for all info anyway guys. If i decide to go serious with it (wont be a looong time) then ill probbaly fully do it again to get 320+hp.
Thanks Again
Blake
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Location:
melb
Registered:
May 2002
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Re: Better motor to hot-rod?
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Fri, 16 July 2004 16:49
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you mention getting an eaton m90 for $700.....I would like to know where?
I checked the capa site and its closer to $3000!!!!
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Better motor to hot-rod?
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Fri, 16 July 2004 18:34
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the difference between supra cams (acis manifold) and the cressida cams really is 4/5ths of fuck all. infact i suspect the lift and duration are identical, just the lobe separation angle is different (by somthing in the realm of 3-4deg)...
...to describe them as a 'low rpm' vs 'sportier' cam is completely crap. youd best consider them the same cam for practical purposes. theyre just tuned to the intake slightly differently.
as for the 'split' ports - these are acttually better for lower rpm use, the cressida ports with the blunt divider offer better total flow, and add turbulence for emissions and economy. this blunt divider is the better modified head for big output numbers... (these conclusions btw - came from an extensive design and flow discussion on PF's (GTS_Boy) and is not supported by actual flowbench data in modified and unmodified state)
and my engine, in current state of crapped out ring and dodgy tune: id be banking on about 250hp @ flywheel. gtech gives me 198hp at wheels. dyno showed ~101kw @ 38-4000rpm before shutting down due to pinging. i dont really care any more to be honest. the war is over...time to move on to bigger and better things 
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Location:
Brisbane
Registered:
July 2002
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Re: Better motor to hot-rod?
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Sat, 17 July 2004 00:42
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just help yourself and throw a 7m gte in there
just had a ride in my mates supercharged vl..
he's using a 1g gte blower before the throttle body and has a wastegate on the piping in between.
gives it a little wack of more power and torque through complete rev range(we thought it might hamper top rev range breathing being 3 litre with a 2 litre supercharger) but didnt..
sounds like a pig though.. sounds fine on boost.. but when off throttle.. wastegate sounds like a fucking chainsaw..
off topic.. but a mention
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Location:
Brisbane
Registered:
June 2003
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Re: Better motor to hot-rod?
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Sat, 17 July 2004 02:09
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| chrisss wrote on Sat, 17 July 2004 02:49 |
you mention getting an eaton m90 for $700.....I would like to know where?
I checked the capa site and its closer to $3000!!!!
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I just saw that in the parts peddler magazine..they are used id guess.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Better motor to hot-rod?
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Sat, 17 July 2004 07:53
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Why not supercharge a 7MGTE? Could work better/cheaper/simpler...
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Location:
Brisbane
Registered:
June 2003
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Re: Better motor to hot-rod?
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Sat, 17 July 2004 09:38
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i dont think thered be enough room unless you bought a hella-expensive vortech one!
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Location:
Brisbane
Registered:
May 2002
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Re: Better motor to hot-rod?
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Sun, 18 July 2004 04:07
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| V8_MA61 wrote on Sat, 17 July 2004 19:38 |
i dont think thered be enough room unless you bought a hella-expensive vortech one!
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I think he was referring to using a 7mgte as the start point for the build up, lower compression, bigger injectors standard, oil squirter's, designed for forced induction etc
Twin charged would be nice tho
Cheers
Wilbo
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Location:
Brisbane
Registered:
June 2003
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Re: Better motor to hot-rod?
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Sun, 18 July 2004 13:25
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hmmm we shall see...i wish i was a millionaire or won lotto! 
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