turbo ???
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
turbo ???
Hey guys ,
My bro and I decided to put a turbo on his daily driver 88 supra. The car was turbocharged form the factory, it came with a CT26 not sure what size it is. So anyways the car now has a custom manifold with a T70 turbo . The turbo is a 61 trim with a t70 housing. The car should be ready to start up this week just waiting on a fitting from summit for the oil feed. Now my questions are...
Do you think the car would be fine with the stock 440cc injectors I think that’s about 42lbs?
The stock fuel pressure is 40PSI should I bump it up to 60 PSI?
The oil feed line is a -6 and the return is a -8 , do you think am fine going with a -8 and not -10 for the return . A friend of mine said that it should be a -4 feed and a -10 return. Is going -6 to -8 going to hurt the turbo?
What do toy think kind of power to get out of the setup?
Thanks
My bro and I decided to put a turbo on his daily driver 88 supra. The car was turbocharged form the factory, it came with a CT26 not sure what size it is. So anyways the car now has a custom manifold with a T70 turbo . The turbo is a 61 trim with a t70 housing. The car should be ready to start up this week just waiting on a fitting from summit for the oil feed. Now my questions are...
Do you think the car would be fine with the stock 440cc injectors I think that’s about 42lbs?
The stock fuel pressure is 40PSI should I bump it up to 60 PSI?
The oil feed line is a -6 and the return is a -8 , do you think am fine going with a -8 and not -10 for the return . A friend of mine said that it should be a -4 feed and a -10 return. Is going -6 to -8 going to hurt the turbo?
What do toy think kind of power to get out of the setup?
Thanks
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
I wouldn't mess with the injectors or the fuel pressure. If you do either of those things then you'll need to do some computer reprogramming. Don't forget the first thing you'll want to upgrade is the fuel pump.
As far as the oil sizes go, if it worked for the last turbo it will probably work for this one as well. People usually run 3 or 4 an feeds and a 10an drain. If you get oil in your exhaust turbine section then you should upgrade the drain for sure.
I'm not sure you are going to see any more power just by upgrading the turbo. You will see some but not enought to justify it. The larger turbo will allow you to run more boost though. By upping the boost you'll see quite a bit of gain. The problem being are you fuel limited or computer limited or parts breaking limited. You should go to the supra forum and check out what other people are doing with their 1jz's. You'll also want to start thinking about ditching the stock intercooler at this point.
As far as the oil sizes go, if it worked for the last turbo it will probably work for this one as well. People usually run 3 or 4 an feeds and a 10an drain. If you get oil in your exhaust turbine section then you should upgrade the drain for sure.
I'm not sure you are going to see any more power just by upgrading the turbo. You will see some but not enought to justify it. The larger turbo will allow you to run more boost though. By upping the boost you'll see quite a bit of gain. The problem being are you fuel limited or computer limited or parts breaking limited. You should go to the supra forum and check out what other people are doing with their 1jz's. You'll also want to start thinking about ditching the stock intercooler at this point.
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Joined: Apr 2005
Posts: 58
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From: Pensacola Fl
Do not run those injectors!!!!!! If you are running a T70 and depending on PSI I would be looking into 550cc or 660cc injectors plus the factory in-tank pump will not handle that much PSI. Also you will not be able to run over 12psi do to the factory fuel cut without doing some kind of aftermarket computer or the LEX upgrade and that turbo might be too big to be for running that low of PSI to even be effective. There is alot you need to be doing before slapping that big of a turbo on the 7mgte and expection big hp numbers.
Last edited by compulsivehp; Apr 18, 2006 at 05:49 PM.
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Originally Posted by red L98
Do you think the car would be fine with the stock 440cc injectors I think that’s about 42lbs?
As for the above poster, I disagree, a larger turbo is not beneficial from a higher PSI, it's beneficial because it is less restrictive on the exhaust as well as providing a better air density (colder) and being able to maintain a more efficient compression at higher RPM. Of course, it can run more PSI as well, as it can flow more, but really, that's only a product of the original benefit (more efficient).
Engines don't don't blow from PSI measured in the intake (ie. boost) they blow because of compression in the cylinder. (air density)
Remember chemistry at equal PSI, hot air is less dense than cold air.
Originally Posted by red L98
The oil feed line is a -6 and the return is a -8 , do you think am fine going with a -8 and not -10 for the return . A friend of mine said that it should be a -4 feed and a -10 return. Is going -6 to -8 going to hurt the turbo?
And finally, why all the supra questions on the vette forum? As for power, check a supra forum to see what others are getting!
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
K guys, thanks for the info. the car has lot more upgrades the fuel pump has been changed also the car has a MAFT " horsepower in a box" 
also the car has the ls6 mass air off a corvette along with more stuffso fuel cut is no longer a problem, 3 inch down pipe ,t-body, msd wires .. I just wanted to see what you guys think about the injector size and the oil line size. And the reason I asked the question on the corvette forum and not the supra forum is because I really don’t trust bunch of little kids with there ricers ... 
also the car has the ls6 mass air off a corvette along with more stuffso fuel cut is no longer a problem, 3 inch down pipe ,t-body, msd wires .. I just wanted to see what you guys think about the injector size and the oil line size. And the reason I asked the question on the corvette forum and not the supra forum is because I really don’t trust bunch of little kids with there ricers ...
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Joined: Apr 2005
Posts: 58
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From: Pensacola Fl
The only reason I am offering advice is because I am a verteran with this car. I owned and rebuilt 3 of them and am currently working on a full forged motor with an SP67 turbo with a rwhp goal of 500hp. If you have any guestion please check out this forum www.supramania.com. They cater to the MK3 only ranging from the N/A 7M-GE, turbo 7M-GTE, and the hybid twin turbo 1JZGTE. I may not have been correct with the turbo PSI but you will not see the full potential of that turbo being on that motor with it having a stock fuel system and internals.
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Joined: Apr 2005
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From: Pensacola Fl
LMAO.......Well with all that know now I would look at 660cc injectors. That is what were are goign to run in motor with the SP67 motor but we are doing a full MAFT PRO speed desity system on the car. Sound like you will have a killer set-up. Good luck with it!
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
Originally Posted by compulsivehp
The only reason I am offering advice is because I am a verteran with this car. I owned and rebuilt 3 of them and am currently working on a full forged motor with an SP67 turbo with a rwhp goal of 500hp. If you have any guestion please check out this forum www.supramania.com. They cater to the MK3 only ranging from the N/A 7M-GE, turbo 7M-GTE, and the hybid twin turbo 1JZGTE. I may not have been correct with the turbo PSI but you will not see the full potential of that turbo being on that motor with it having a stock fuel system and internals.
Cool,
we plan to run about 18 psi . the car also had the head gasket replaced and arp head studs . we want to get the car in the 12 sec range .. any more help would be great ..thanks
guys
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Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
lol yeah , we just put my old set of welds on it and they look sick , we also took the back seat out but that didn’t do much
It sound like you know a lot about the supra, im new to this import stuff. People on the street don’t want to race the vette anymore so i was like lets build this bad boy.. People around my town cant stand imports so getting races shouldn’t be a problem: lol:
It sound like you know a lot about the supra, im new to this import stuff. People on the street don’t want to race the vette anymore so i was like lets build this bad boy.. People around my town cant stand imports so getting races shouldn’t be a problem: lol:
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
I met with one of those supras on a really twisty road last week. I've gotta say they can handle pretty well. I definately wasn't pushing it as hard as I could have been, but I value my life. I would pull on him in the strait aways, but he would catch back up around every curve.
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
Originally Posted by mn_vette
I met with one of those supras on a really twisty road last week. I've gotta say they can handle pretty well. I definately wasn't pushing it as hard as I could have been, but I value my life. I would pull on him in the strait aways, but he would catch back up around every curve.
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Joined: Apr 2005
Posts: 58
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From: Pensacola Fl
Originally Posted by red L98
lol yeah , we just put my old set of welds on it and they look sick , we also took the back seat out but that didn’t do much
It sound like you know a lot about the supra, im new to this import stuff. People on the street don’t want to race the vette anymore so i was like lets build this bad boy.. People around my town cant stand imports so getting races shouldn’t be a problem: lol:
It sound like you know a lot about the supra, im new to this import stuff. People on the street don’t want to race the vette anymore so i was like lets build this bad boy.. People around my town cant stand imports so getting races shouldn’t be a problem: lol:
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
Originally Posted by compulsivehp
Yeah, the supra is what got me into performance cars. I had to sell my supra for a daily driver because I started my own performance parts company and needed reliable transportation. Let me know what the supra finaly does and I will not be suprised if you exceed your goals.
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From: Pensacola Fl
Originally Posted by red L98
cool, thanks alot man... what do you think a good tuned supra's lower end would handle ? the car has about 100000 miles
It sounds like you have a great build for a possible 500+rwhp supra depending on all the turbo specs butyour bottom end will probibly not hold for long and possibly not at all depending on how those 100k miles were put on the car. It is not uncommom for the stock bottom end to handle 500+hp but it all depends on how the hp is applied.
Also lets move this to PM's before we get busted for import talk in a Vette Forum.
Thread Starter
Melting Slicks
Joined: Jul 2003
Posts: 2,284
Likes: 4
From: Canton MI
Originally Posted by compulsivehp
It sounds like you have a great build for a possible 500+rwhp supra depending on all the turbo specs butyour bottom end will probibly not hold for long and possibly not at all depending on how those 100k miles were put on the car. It is not uncommom for the stock bottom end to handle 500+hp but it all depends on how the hp is applied.
Also lets move this to PM's before we get busted for import talk in a Vette Forum.
Also lets move this to PM's before we get busted for import talk in a Vette Forum.
ohh your PM dont work , all i see is your email
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Joined: Apr 2005
Posts: 58
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From: Pensacola Fl