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Location:
Eagleby, Queensland
Registered:
June 2004
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7M-GTE and CT26 Turbo
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Wed, 09 June 2004 11:38
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Just a quick question. How does one increase one of these to 12psi?
and if so should i get a copper head gasket as these old engines tend to blow quite easily.
In all respect the 7M-GTE is a torquey and powerfull engine (around 230hp stock) and i read that someone somewhere as had one of these engines up around 700hp by installing a 30psi turbo, no don't get me wrong, how does he keep it reliable with all that power, or is it complete nonsense?
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Location:
Brisbane
Registered:
May 2002
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Re: 7M-GTE and CT26 Turbo
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Wed, 09 June 2004 13:55
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12psi is a simple matter of fitting a bleed valve; a very common and painless procedure. A copper headgasket would be a good precaution, but you realise you have to completely strip the engine down to install one of those right? In any case the 7M's headgasket weakness is extremely well documented so I won't go into it any further; do a search and you'll be up to your elbows in useful information.
700hp from a 7M is certainly possible and it's been done plenty of times, but a lot of modifications are necessary to make a 7M hold together with that sort of power. You certainly won't get anywhere near that much with a stocker!
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Location:
Brisbane
Registered:
November 2002
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Re: 7M-GTE and CT26 Turbo
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Wed, 09 June 2004 23:41
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INcreasing the boost to 12psi isn't really possible on one of these, you will find that you hit boost cut sometimes (if not all the time). About 11-11.5psi is the maximum, as sometimes it will spike and you'll think you blew it up 
Check the torque on the head bolts before you do anything else. Take it to a mechanic, and ask them to retorque it - I think the figure is 72 ft-lbs but please don't quote me on the exact figure.
While the car is at the mechanic, get them to do a full service including fuel filter, oil, oil filter, spark plugs, timing, etc. as well as any other routine servicing (eg timing belt if it's due).
Then, I would look at getting a full 3" exhaust system (not just a 'cat back') exhaust. This is your biggest power upgrade on a basic setup, and is probably worth about $900 give or take a little depending on how pretty you want it.
Once this is done, get a bleed valve fitted, and you are probably safe to run up around the 11psi mark as I said. I would not increase the boost without doing the exhaust first - one because the exhaust will strangel the power gain, and two because the exhaust housings on these turbos are known to crack and the restrictive exhaust dump won't be helping this.
A K&N (or similar) filter in the standard airbox should be your next modification.
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Location:
Brisbane
Registered:
November 2002
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Re: 7M-GTE and CT26 Turbo
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Thu, 10 June 2004 00:19
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Oh, and don't even dream about running anything other than Optimax/Ultimate... standard unleaded and normal premium unleaded fuels are cr@p and will see you blowing up your engine in no time.
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Location:
Brisbane
Registered:
July 2002
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Re: 7M-GTE and CT26 Turbo
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Thu, 10 June 2004 00:33
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the way i am/will be running my 1jz is 3 weeks of ultimate and then 1 week of shell optimax.. optimax has more cleaners so im going to put it through once a month to keep it all good inside
as a note.. john from importbitz's mz20 soarer made 198rwkw on 8 psi.. may not be on std turbo and have everything else done.. but that just shows how good the engine can be
imagine it with any sort of boost!
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Location:
Sydney
Registered:
February 2003
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