turbo spooling early?

so i rode to lunch in my friends 88TC 5-speed. we were comparing differences to my turbo stang, and we noticed that it sounded/felt like the turbo spooled early, and got done spooling around 4 grand. it kind of hit a plateau. car has a fresh tuneup with motorcraft wires/ autolite plugs, new distributor, egr, iac, etc....

is there anything in the vacuum system that could cause the wastegate to open/close prematurely causing it to stop spooling?? he boosts 16.5psi, but it just feels like it stops.

does any of this make sense??
-matt

Does he have the stock boost control solenoid? If so, no dice on crazy boost. He'll have to ditch it in favor of a Gillis or something similar to get more boost.

Is it the stock IHI? They spool a little sooner than the T-3, but I dunno what you have so it's hard to compare.

16.5 ain't bad [Image: rolleyes.gif]

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86 TC, 73 Austin Mini

Click here to beat a ricer.

i know 16.5 isnt bad [Image: rolleyes.gif]

but i'm boosting 17psi, and it pulls all the way to 6 grand. his seems to stop around 4 grand. he has a gillis and stock IHI.

His IHI "should" pull beyond 4K. Does his car have a LOT of mods including full porting, exhaust system and maybe a cam? Other possibilities include insufficient fuel or overly resrictive exhaust system (clogged cat maybe)

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NATO Member. it's not a vice, it's an obsession
Letting the cat out of the bag is a whole lot easier than putting it back in.
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm