turbo lag

[waldo786]

On the 85 GN's how bad is the turbo lag and what was done to correct it in 86/87? Was it a computer tweak or something else?

 

[BLACK6PACK]

Can't say anything about the 84-85 models, but the only reason for turbo lag on a stock 86-87 car would be mechanical problems. If a torque converter is matched properly to the turbo size, turbo lag is nearly non existant.

 

[bison]

Can't say anything about the 84-85 models, but the only reason for turbo lag on a stock 86-87 car would be mechanical problems. If a torque converter is matched properly to the turbo size, turbo lag is nearly non existant.

A catalyic converter will increase lag a lot especially if its falling apart inside. Collapsed baffles in the muffler will cause it too.

 

[QUIP'6']

wouldnt the innercooler help with the lag problem that hot air cars had?

 

[bison]

wouldnt the innercooler help with the lag problem that hot air cars had?

Intercoolers increase lag if anything. More volume=more lag. The 84-85 have a more restrictive exhaust than the 86-87. Also a lot of these cars have the wrong torque converter since the trans has probably been out before. Coverting to 86-87 ecm and chip may decrease lag also if the chip is programmed correctly. The turbine is slightly different and less efficient as well. Get a stock 86-87 turbo (TBO348) and have the 84-85 compressor housing cut in a lathe to fit the 86-87 comp wheel. The turbo vendors can easily do this.

 

[waldo786]

Thanks for the info. The car I'm looking at is an '85 that actually has a new exhaust with headers and a 3.73 rear put in so a lot of those would help. Good info on the turbo. Will have to look into possibly getting an 86/87 if I can get the car. Might get a new chip at some point too so seems like it could be a solid runner. Thanks!