North American Turbocoupe Organization



Problems after T3 install
mustangtyy Offline
Member
#1
I installed a t3 in my 87 tc. With the IHI i had none of these problems: When the engin is cold if I give it boost above 10 psi it shutters and wants to stall, my boost gauge flops all over. Once the car warms up the car runs fine with full boost. Next, with no boost, if I let off the gas is fine. If i let off the gas with any boost it bucks. Ran codes and got the regular ones. Fuel pressure is set at 40 psi. Could i have a boost leak? At the idel I get 20 psi vacuum when warm. Also when I the let off after boosting I hear a strong rush of air, The IHI never did that. Normal with the t3? ????? Ty

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87 TC with 190,000. Gillis valve, K&N on VAM, Home made "Ram" air, Sac Mustang DP to a 3" Dyno Max Super Turbo dumped before rear axle, Ported E6, GN FMIC, RR Cam, T3 at 20 psi.
87 TC with 190,000. Gillis valve, K&N on VAM, Home made "Ram" air, Sac Mustang DP to a 3" Dyno Max Super Turbo dumped before rear axle, Ported E6, Paxton AFPR, GN FMIC, RR Cam, T3 at 20 psi, OBX BOV, Spec Stage III Clutch.
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Pete D Offline
Administrator
#2
Quote:When the engin is cold if I give it boost above 10 psi it shutters and wants to stall, my boost gauge flops all over.

The engine and turbo rebuilders of the world absolutely adore this kind of behavior. It keeps them in business. Aside from the excessive wear on engine and turbo bacause the oil isn't thinned out enough to flow well, the shuddering and boost gauge behavior is indicative of a boost leak somewhere. The first thing to check is the intercooler hoses and clamps.

Quote:If i let off the gas with any boost it bucks
AND
Quote:Also when I the let off after boosting I hear a strong rush of air, The IHI never did that. Normal with the t3? ????? Ty

If you aren't running a BOV or a BPV, this is probably normal. It can happen with the IHI also, just not a noticable because it isn't moving as much air. The rush of air that you are hearing is the compressed (boosted) air that was rushing toward the intake manifold, but instead is bouncing off the closed throttle plate and is now rushing back toward the compressor blades to stop them from spinning with great force (the shudder). Over time this can damage the turbo. A properly installed BPV will correct the shuddering part of the problem

You vacuuum is fine. The probable boost leak may be in the turbo side of the throttle plate and if so, will not affect vacuum reading, hot or cold. Only leaks after the throttle plate affect vacuum, but this can include leaks from the vacuum tree or the sub systems running off of it.
Pete Dunham


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