wonny

Can someone explain this please?

I saw this posted on an earlier thread and I read a couple articles on the internet, but I don't see how a larger DP can cause boost creep.

From what I gathered, the DP is the pipe that excess gases travel through once the desired boost level is reached. If this is the case, wouldn't the larger Dp allow for more effective exhaust gas removal?

How does this traslate to boost creep?

Thanks for the help,
Dave

sgi

after installing a blitz downpipe and blitz nurspec exaust on a customers car, it started to creap.. (91 mr2 turbo) i duno why

ttt, i wanna know as well.

drewspeed

Did it start to creep after installing the larger DP?

I've seen in the past where the wastegate dumptube had too much of an angle which caused boost creep. We then smoothed out the curve in which the gases exited and the problem was solved. If this doesn't give you any ideas....then sorry

wonny

on the other post it was said that the exhust gases being dumped back into the manifold resulted in too much gases spooling the turbo. Can be sloved by porting hte WG or getting a better, bigger? one.

In teh case of the tegs where the dump pipe was bent - the reason is obvious.

Thanks for the help guys,
Dave

BudaKai

It depends on the flow of the wastegate. If running an internal wastegate you're more prone to this problem. The best thing to do is to either port out the WG opening on the DP side or put a spacer to give it more space before the two flows are pushed back into each other. External wastegates don't have this problem.

CovertFI

you can get a fuzzy logic boost controler. i think that would help. it is suppose to learn when you wg opens.

BudaKai

It's not when the WG opens or anything like that. It's the pressure levels and the WG it self not being able to relieve them fast enough to keep the boost levels even.

The gasses are taking the path of least resistance in other words. Which in this instance would be through the turbo. You need to just open up the path for better flow, or just smooth out the path for better flow.

Make sense?

CovertFI

right!! but if he can get the wg to just open earlier, shouldn't that solve his problems

falcongsr

people need to learn that a boost controller cannot lower boost below the WG's threshold, only raise it and stabilize it at a higher level. whether it has a fuzzy navel or whatever.

BudaKai

Ok... Read what Falcon said. It would be the same if you just left the boost control to the internal spring. Think about it for a second or two. Boost controllers are only for higher boost levels than the spring in the WG can allow.

falcongsr

i wish i could drop in a "weaker" spring in my internal wastegate actuator so i could actually use a boost controller. i have more boost than i want right now.