Help! Too much boost!

[Enraged78]

Hey all,

I've got an early build '95 TSi AWD. Mods are: BCS removal, Test Pipe, K&N FIPK, No dump tube, Triple pod, boost gauge. In the fall, I was getting 16PSI until 5200 RPM, where it settled to 12 PSI. It would spike to about 20~21PSI. The other day, I was pulling onto the highway, and a civic didn't want to let me in. I romped on it in fourth, car pulled like the bejezus, and then I got what felt like fuel cut (felt like rev limit kicked in). Just before that, I glanced at my boost gauge and saw a 23 PSI spike! It was VERY cold that day, about 5 degrees out, and the car was fully warmed up. I tried this again when it was warmer, and got only 20PSI again. My questions are:

1.) Why the hell is it spiking so hard? Is something wrong? Or is the bcs just slow from the cold?
2.) Was that fuel cut, or something else?
3.) Should I worry about my block/rings/pistons? I don't really care about the T-25, as it's getting replaced soon.

Any help would be appreciated.
Thanks in advance,
Matt.

 

[Eclipsor16G]

What boost controller are you running? We'll need more pertinent info (not things like triple gauge pod) to answer your question correctly.

Chris

 

[airbrat]

yes, that was fuel cut you were feeling. you have to remember to compensate in the cold weather. every winter I have to turn down my boost a good 1-2psi or I'll hit fuel cut in the early morning.

just turn down your boost (I'm assuming you have a boost controller). Ya gotta remember TURBOS LUV DA COLD!

 

[25psi]

Originally posted by Enraged78

1.) Why the hell is it spiking so hard? Is something wrong? Or is the bcs just slow from the cold?
Matt.

Is your o2 housing stock? If so to help get rid of boost creep,port the stock one or buy a high-flow after-market o2 housing.

 

[Enraged78]

Thanks for all the replys guys. First answer, no I don't have a boost controller yet. The BCS mod was doing exactly what I needed it too, and I lived with the creep. Now, according to Airbrat, what I am seeing is definately fuel cut. As a result, I will have to keep off of the loud pedal in the morning and when it's really cold, or the turbo will hit 24 PSI. I have a 14b that's going on in the spring, along with a 2.5 inch downpipe, 3 inch high flow cat, 3 inch exhaust, and Dawes boost controller. I plan on porting the 14b, exhaust manifold, and O2 housing when it all goes on. I'll remember to keep the boost controller down a couple of pounds in the winter, and I should be good to go.

Sound good?

Thanks again,
Matt.

 

[nine5raptor]

you are seeing spike, not creep. the t25 is pretty much too small to creep. spike happens low in the rpm and is usually considered far less harmful than creep, which happens on the topend (5k+) where knock is more likely. get a boost controller or make one for like $10 and you'll get rid of the spike and have better spool than with the bcs bleeder.