Question about Supra 1987 87

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I have a 1987 toyota supra with turbo . I just replaced the stock 48mm turbo with a 61mm turbo from cx racing the waste gate on the stock one was broke. with the new turbo it wont spool up past 3 pounds of boost ive replaced all turbo hoses and had the intercooler cleaned out and pressuer tested. So i thought the electronic boost pressure gauge was incorrect i bought a autometer boost and vaccum gauge and they both read the same.check engine light isnt on but does work if i unplug any sensor under hood for the life of me i cant figure out whats wrong with the turbo system

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A turbo works from expanding exhaust gasses
on the smaller turbo the gasses fill the snail and turbine wheel exactly
That is the engineered design for that size engine
however with the bigger turbo there is not an increases in exhaust gasses to actively drive the turbine so it has been a wasted exercise
with turbos , bigger doesn't equal better as it has to be in relation to the gas flow from the exhaust
again if you haven't reset the ECM for the extra fuel needed for the bigger turbo and inlet flow then there is not the hot exhaust gasses needed to drive the turbine wheel to create the extra boost

Posted on Apr 24, 2017

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How do i install a t70 turbo to a 1987 toyota supra turbo 7mgte 3.0


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I need of a turbo waste gate on a 7.3 liter


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Timing Dpecs for Toyota Supra 87 6 cylinder


1987 non-turbo: 10 deg Before Top Dead Center (BTDC) @700 rpm
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To set the timing, you will need to connect a jumper wire between terminals E1 and TE1 on the diagnostic terminal. This diagnostic terminal is located just aft of the engine compartment fuse box. It is a black plastic box marked "diagnostic" on the cover, which flips open to reveal the terminals inside. There is a diagram on the inside of the cover which explains the terminal positions. On the Turbo model, you need to remove the forward section of the engine cover to gain access to the number one spark plug wire.

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Engine compatible


Yes. However it is a very expensive swap $5000 to $8000 to do it right. You will need the 1J or 2J engine, transmission, wiring harness, ecu, and alot of other pieces to do the swap. The engine brackets will need to be modified and you will have to upgrade your brakes. This kind of swap requires a good knowledge of the Toyota Supra and the engines. I do not recommend this swap for a beginner. A cheaper way is to take a 7M-GTE and upgrade the internals and turbo.

Jul 09, 2009 | 1987 Toyota Supra

1 Answer

Aftermarket exhaust


im not sure where you are located. but here us repair shops with exhaust benders can make your racing exaust system. and most of the time we can install it for you cheeper than youcan buy a cat back system. just stop by an independent repair shop with an exhaust bender and talk to them you will be suprised.
later paul

Feb 10, 2009 | 1989 Toyota Supra

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