North American Turbocoupe Organization

IHI Turbos 5 Speed vs Auto Part Numbers
riisitas Offline
I noticed that the 5 speed and Auto 88 TC has two different part numbers for the IHI Turbo. What's the difference between them? Do they install any differently?

Ford Part Numbers:
New Turbo for 87-88 TC E7SZ9G438A (5 Speed)
New Turbo for 87-88 TC E7SZ9G438B (Auto)
1988 TC 5 Speed Stock

thecrusher315 Offline
Senior Member
As far as I know, the turbo itself is the same but I have heard the waste gate actuator(WGA) is different. Not 100% on this but I beleive the auto WGA one will not allow as much boost as the 5 speed WGA....Tommy

Nsw Offline
Senior Member
The auto did have less boost. but from what i have read the computer and BCS limit the boost in autos. The turbo and waste gate should be the same. Someone chime in if I am wrong.
1988 5speed black every option. 3inch single turbo to tail(stinger), manual boost control. k&n cone walbro fuel pump

1986 xr4ti project car..... way to many mods to list.

Jeff K Offline
AFAIK, they are the same.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized

AerobirdMotorsports Offline
I've personally swapped WGA's from a 5-Spd to an Auto and visa-versa. Neither's boost changed. It's all in the BCS and ECU 100% for sure.

There are no physical differences in the IHI's either. I have one of each sitting here.

riisitas Offline
Thanks for the information. I'm in the hunt for a spare IHI. Ultimately I'd like to upgrade to a T3 or hybrid once I understand the upgrade process better, have a firm grasp of the parts required and have confidence in the upgrade plan/reliability of the set up from the fuel tank to the computer, sensors and guages out to the exhaust system. One key thing for me isn't just higher horsepower. It's drivability in traffic, usable power, spool up time, cold A/C, reliability and the ability to run/cope with the high temperatures in southern Nevada. I'd also like to keep my fuel consumption reasonable for road trips.
1988 TC 5 Speed Stock

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