Boost spike and lags hard when I shift fast.

[NOOB1GDUDE]

What's up guys more problems with the car now. Here it goes. When I step on the gas pedal it boost fine than when I shift fast the boost lags a lot like super lags. This is all happening from 2k to 4K.The spike problem is like this from 2k rpm to 4K it holds 15psi after 4K it spikes out of control like if the boost controller was turn up all the way. I'm thinking it's the wga because the mbc is turned down all the way down and its boostin 15psi and like I said it will spike super high.

 

[GST with PSI]

Going down is not really that retarded man, going too big is but its from a logical point though!

Your sentence implies adding a smaller downpipe is at least somewhat retarded, which I agree with. Why don't we just tell him to reinstall the stock exhaust system and fix all his problems?

IMO, adding a smaller downpipe is the equivalent of adding an extended slave cylinder rod...Yes, it could fix the problem, but ignores the underlying issue at hand.

 

[EvolutionPlus]

No reason to bicker, everyone is right in their own way. The main thing about this is getting the OP the simplest solution to his problem. Sure anyone can rebuild an exhaust system, but he could not have the money, etc. Keep the point at what will be easiest for the OP. Now like GST said, a flapper that can be opened all the way will DEFINITELY be the simplest possible fix. Worth a try.

 

[FIBA M - EC17PSE]

Your sentence implies adding a smaller downpipe is at least somewhat retarded, which I agree with. Why don't we just tell him to reinstall the stock exhaust system and fix all his problems?

IMO, adding a smaller downpipe is the equivalent of adding an extended slave cylinder rod...Yes, it could fix the problem, but ignores the underlying issue at hand.

Im not a betting man but on this occasion I bet 100% if he did install his stock exhaust DP but left the rest 2.5" it would fix it completely!

Im still shocked that you think a 3" DP is not the cause when its been proven, and even more shocked you think a 3"DP to a 2.5" back system is ideal and fine? this is the opposite way around by all means,

Im done with this anyway as i can help aid the fix but i know what the actual fix is and it is more work then needed, people always want an easy fix that might solve it but would rather avoid the fix to actually fixing it fully or 95% of it.

I am brutally honest yes and straight to the point but thats only because its what needs to be done sometimes that is all,

 

[EvolutionPlus]

I am just going to ... Op you satisfied?