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Location:
Adelaide Street Racing ca...
Registered:
November 2004
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Making 250-300rwkW with 7m-gte HELP PLZ
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Thu, 04 November 2004 12:17
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Hi,
I'm after some info on modifying a 7mgte powered 89 supra. The car is a very low km manual jap import with exhaust. I understand head gaskets are a problem.
I plan to replace the head gasket with a steel item (i hear hks make them) and instal new arp head bolts. Does anybody know what this will cost doing the work myself?
What parts will I need to make 250-300rwkW apart from the head gasket?
I hear the turbo can be high-flowed with to4 wheels, I assume this will be necessary.
Will the stock intercooler be up to the job?
Will I need new injectors, fuel pump or fuel reg?
Will I need a fuel cut defender or something similar?
Will anything else need to be replaced or improved?
Should I swap cams, anything a drop in fit? or port the head/inlet manifold when changing the gasket?
Thanks for your help, I tried searching the forums but it's hard to find direct answers to these questions.
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I supported Toymods
Location:
Perth
Registered:
July 2004
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Thu, 04 November 2004 12:50
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Rabid Chimp do the Head Gaskets for $140 USD.. you can buy online.. dont know anyone that does the HKS one locally. And its a long afternoon to change it, but Im goin down the same path as you bro so let us know how you go with it
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Location:
Perth
Registered:
August 2004
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Thu, 04 November 2004 13:11
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Well there are probably many schools of thought on making this sort of power from a 7mgte....
250rwkw you could probably get away with
Metal head gasket arp head bolts (do a compression test first) The injectors should be ok but you will need either a piggyback fuel computer or a complete aftermarket system...
A hiflowed turbo would be a must you may even loo at a garret gt30 or similar ballbearing turbo.. you will also want to throw away your exauhst and start again...
For 300rwkw you will definately want to look at forged pistons etc
What might be a good idea to source one of the group a motors which came with an uprated turbo and TRD cams etc....
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Location:
Sydney
Registered:
January 2003
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Thu, 04 November 2004 13:14
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About $300 for the HKS head gasket from Toyota Penrith and ARP head studs were about $240 (from some melb online place, cant remember to tired).
Yes you can high flow stock unit but if you have the money go something a little more decent like GT3xXX 
new cooler, new injectors, aftermarket ECU/PIGGY, new fuel pump. New clutch since the old one will die pretty soon with that power!. Maybe new raditor depending on how you gonna use the car.
There are other ways, try supraforums.com i think the questions like this have been asked about 6900 times
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Location:
Adelaide Street Racing ca...
Registered:
November 2004
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Fri, 05 November 2004 07:09
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Anybody know about porting? How much does it generally cost to have the inlet man and head ported in ma70 turbo? Is it worth doing while the head gasket is off?
Also, in the nissan RB engines: they perform better with the NA cams fitted to the turbo models. More lift and duration i believe. Is this the same with the ma70?
If the MA70 is an imported '89 S spec manual what diff will the car have and will it be up to the job?
What ecu should i go with if i decide to go aftermarket(living in adelaide)?
Also, what injectors should i buy if i upgrade them? Are any other cars injectors a drop in fit?
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Location:
Perth
Registered:
August 2004
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Fri, 05 November 2004 09:41
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| RAWS wrote on Fri, 05 November 2004 18:09 |
Anybody know about porting? How much does it generally cost to have the inlet man and head ported in ma70 turbo? Is it worth doing while the head gasket is off?
Also, in the nissan RB engines: they perform better with the NA cams fitted to the turbo models. More lift and duration i believe. Is this the same with the ma70?
If the MA70 is an imported '89 S spec manual what diff will the car have and will it be up to the job?
What ecu should i go with if i decide to go aftermarket(living in adelaide)?
Also, what injectors should i buy if i upgrade them? Are any other cars injectors a drop in fit?
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In my opinion even for high hp applications a port job is not really that important.. I would get the inlet manifold port matched to the head however.
As for the cams if it is one of the 89 S spec or GRP A cars (The one with the extra big vent at the front) Then it already has uprated cams. If not then the N/A cams will probably be an improvement. Im not 100% if the NA cams are the same fit however as the NA motor runs a dizzy of one of the cams.
As for the LSD it has a torsen centre factory so it should be fine...
As for the after market fuel computers a like the Haltechs the E6X or E11s are nice ecu's.. If your on a budget ive seen a megasquirted 7mgtes at about the 400hp mark
The car uses top feed injectors and most top feed injectors will bolt straight on.. any aftermarket injectyors for GTR's should be fine, however the stock 440cc should see you upto the 300kw mark anyway.
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Location:
Adelaide Street Racing ca...
Registered:
November 2004
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Sat, 06 November 2004 03:16
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Yea I am on a bit of a budget. Not too strict tho, got some $ to play with.
Can I fit a GTR cooler? Will it fit and how hard is it to have the inlet pipe coming from the other side of the engine bay (as it would be with GTR cooler)?
Also, what is megasquirted? Is there a readily avaliable short shift kit for the manual?
Can someone possiblly tell me a complete setup they would use if they wanted to make this kind of power in a 7mgte?
At the moment the plan is:
3" ss exhaust from turbo back
gtr intercooler, new piping, BOV
fuel pump, injectors
metal head gasket, arp head bolt kit
possibly inlet man port matched to head
turbo high-flowed with to4 wheels or possibly ball bearing turbo
aftermarkey ecu and electronic boost control
extreme clutch, ebc green stuff pads
will do suspension later
Is there any other parts I should be getting? Should I do anything differently? It will be my daily driver and needs to be reliable.
Thanks guys.
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Location:
Campbelltown
Registered:
November 2003
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Sat, 06 November 2004 03:21
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A guy posted about a old soarer with a 7mgte last week, had some serious mods as it was used for raced, destroked to 2508cc and was producing 330rwkw, so anything is possible I guess, my advice would be to try and track him down for some hints
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Location:
Perth
Registered:
August 2004
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Sat, 06 November 2004 10:56
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| RAWS wrote on Sat, 06 November 2004 14:16 |
Yea I am on a bit of a budget. Not too strict tho, got some $ to play with.
Can I fit a GTR cooler? Will it fit and how hard is it to have the inlet pipe coming from the other side of the engine bay (as it would be with GTR cooler)?
Also, what is megasquirted? Is there a readily avaliable short shift kit for the manual?
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Ok Yes I have seen a GTR cooler fit.. You will have to move or replace your power steering fluid cooler (Best replace it with something more substantial anyway) Then the GTR cooler fits quite easily..
As for the cooler pipes you can make the pipe come back around and back onto the correct side. Since you need custom piping anyway it will be pretty simple.
A megasquirt is an aftermarket ECU you can build yourself with very little electronics knowledge.
http://www.bgsoflex.com/megasquirt.html
If you dont want to build one you can get them made at a reasonable price.. The Megasquirt is a fully programmable fuel ECU replacing your stock ecu..
Yea there are short shift kits available just search google and you will find the gearbox model is an R154
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Sat, 06 November 2004 11:05
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www.turbo-a.net
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Registered:
October 2004
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Sat, 06 November 2004 14:46
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250-300rwkw + on a budget is not a combination that will amke your engine last very long.
And think through why you really want that much, over say 220 which can reliably be had much more cheaply
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Location:
Brisbane
Registered:
November 2002
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Sat, 06 November 2004 15:16
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| Quote: |
3" ss exhaust from turbo back
gtr intercooler, new piping, BOV
fuel pump, injectors
metal head gasket, arp head bolt kit
possibly inlet man port matched to head
turbo high-flowed with to4 wheels or possibly ball bearing turbo
aftermarkey ecu and electronic boost control
extreme clutch, ebc green stuff pads
will do suspension later
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No need for exhaust to be stainless as long as the car is regularly driven. For these power levels I would consider a surge tank in addition to the upgraded EFI pump - RX7 injectors will do the trick but I'd suggest you get them cleaned. Porting is a waste of energy.
You can get better coolers than the GTR for about the same money - brand new, larger, less restriction... so why buy old sh!tty parts just because teh GTR can nevar loose?
MHG, ARP bolts, and aftermarket ECU with an EBC are definitely the way to go. Ignore anyone who says you require forgies at this level - they aren't a necessity but they're something people seem to think are a requirement. You really only need forged pistons if your engine is detonating.. and if your engine is detonating you should be getting it tuned somewhere else!!
At such a high level of performance budget for reglisiously regular oil changes (4-5000kms at a maximum)... also budget for a gearbox rebuild to upgrade the thrust washer and probably a tailshaft too (I twisted mine with CONSIDERABLY less than 250rwkw).
Now if you do all that, and as you say the rest of the motor is in good nick, then 250rwkw will be a walk in the park - but you're dreaming if you want a genuine 300rwkw on a basic hiflow without serious dollars. I would hazard a guess that, as you're asking these questions, you have NOOOO idea how fast your car will be with 250rwkw.... believe me it's plenty.
Please note you've listed about $10,000 in modifications. If you don't have that much money, then start saving!
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Location:
sydney
Registered:
July 2004
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Location:
Lismore, NSW
Registered:
February 2003
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Re: Making 250-300rwkW with 7m-gte HELP PLZ
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Sun, 07 November 2004 07:06
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When I got my Supra rough tuned the most the injectors would handle was 14psi (This was keeping it within the right A/F ratio), my next upgrade is a walbro 500hp fuel pump and 660cc injectors which will be going in once I recieve my HKS 2mm HG
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