Just got my 87 TC

[AmMscl]

NooB????s
I just got my 87 TC today, the idle is kind of rough.....but gets better when it reaches OP Temp. What should I see for Vac at idle and what RPM?
One thing I noticed is, it builds boost (up to 10PSI by around 2500-3500) but then starts to fall off way before redline WOT.
I've seen 10PSI at 5500, but car was not pulling very hard (No ping or over heating)
87 TC = 108k on it and no mods (5spd)
Thx

 

[Red_LX]

Sounds to me like you have a vacuum and/or boost leak somewhere. check the couplings on the intercooler and also check the vacuum lines to make sure none are unhooked or cut.

 

[AmMscl]

From what I've been reading, the IHI starts to fall off after 4500-5000 RPMS...is this possibly what I'm experiencing?
Sorry, new to the turbo world...Every supercharger I had pulled all the way to redline?

 

[Red_LX]

Well I dunno, people have told me that too although my car seemed to pull good clear up to 5000+ RPM and I definitely didn't have the boost fall off at the upper rpm's either.

 

[ratrapp2]

is it an a/t car?most a/t cars are limited to 10 psi.your factory boost control solenoid could be going bad as well.we replaced the one on my brothers 88 turbocoupe with the gillis valve,best $45 spent on the car.it's adjustable up to 17/18 psi.also turbo boost does fall off alittle compared to supercharged boost.my brothers car also had a rough idle,his problem was a bad tps and dirty iac.we used a ford tps(these car prefer ford parts,especially plug wires)and cleaned the iac.

 

[AmMscl]

red lx: I switched over to premium (switch) and got a pretty good response...still only about 10PSI

ratrapp2:5spd...thanks for the advice I will check those components out