turbo lag

[evan1170]

so ive recently partly rebuilt my motor... precison 58/57 bb turbo, and i have all supporting mods. when i went to the dyno my clutch was slipping and didnt make great numbers, ntm they think my cat is kinda clogged. i think im goin with a act 2600 street disk and that should be fine, and also just got my car smogged so i thought about building a test pipe. going up hills or normal acceleration my car has some trouble boosting, and sometimes feels sluggish, do you think a test pipe will make my spool up that much better?

 

[RLPerformance]

A restrictive cat is a lot of backpressure so its always going to help but I would hope they didnt try to finish the tune on a slipping clutch since its not accurate. Meaning the tune is still probably not ideal to faster spool up.

Youre also running a pretty decent sized turbo that is laggy under normal driving conditions.

 

[Dylan0123]

Kind of an obvious one and maybe a stupid question but:

Have you done a boost leak test recently? I wonder if that would help the sluggishness/lack of boost.

 

[crusada]

As stated above if they finished the tune on a slipping clutch they need to be smacked. It could be the tune. When they were tuning it did it seem to have turbo lag at all? That would be a good question to ask them. As far as the test pipe goes that wont be a bad idea at all. A 3 inch cat that i see in your profile i dont see how that beast is clogged though. Id get a new tune done then try it out and see what happens. thats just my .02

 

[1MeanTSI]

ANy pre turbo exhaust leaks? I had a cracked manifold and my 16g was only spooling 8 lbs by 3500 rpm. Maybe a leaky bov as well

 

[CharlieGTGSX]

Like said above... cat can do that if its clogged, remove it... 3" free direct exhaust is the best!!!

But... you can check your intercooler piping too... I see lag in my car suddenly... and I thing that the turbo gone... cheap thing... but when I see... a clamp of a silicone coupler opened (bad quality) and start a little very little leak... enought to lag from 2500 to 4500rpm... I put T-Bolt clamps and problem gone! Spool faster again

 

[evan1170]

they did not finish the tune on the slipping clutch, so i know there is still room for improvement. The cat it has is a 3in, but it was cheap. But there are no leaks and intercooler couplers are tightened down. Im looking forward to this straight pipe setup and think it will help a lot, maybe just get the clutch over with, make a test pipe, then back for another tune. Hopefully it will work out in the end.