Evo 3 16g boost creeping bad !

[v8killer]

Ok guys i am having a bad boost creep problem that i can't figure out. With the boost/vac line sourced from the uicp strait to the wastegate it will hold 9lbs till about 4000rpm then creep to 21-22lbs by 7000rpm.

 

[SpawnedX]

Look, I am not trying to big the biggest dick ever, but...member since 2002 and you still haven't learned how to use search, which concerns me more than that you still don't know what boost creep is caused by...

http://www.dsmtuners.com/forums/art...boost-creep-modified-wga-peepers-mod-how.html

http://www.dsmtuners.com/forums/art...oler/186525-how-cure-boost-creep-porting.html

http://www.dsmtuners.com/forums/art...rcooler/96678-boost-spike-vs-boost-creep.html

 

[v8killer]

Look, I am not trying to big the biggest dick ever, but...member since 2002 and you still haven't learned how to use search, which concerns me more than that you still don't know what boost creep is caused by...

http://www.dsmtuners.com/forums/art...boost-creep-modified-wga-peepers-mod-how.html

http://www.dsmtuners.com/forums/art...oler/186525-how-cure-boost-creep-porting.html

http://www.dsmtuners.com/forums/art...rcooler/96678-boost-spike-vs-boost-creep.html

Well ? i did search and believe its a different problem than the norm. I've had 14b's and 20g's that didn't creep this bad. yes i know how creep works.

 

[JusMX141]

The Evo III has a completely different turbine housing which flows better than any of the standard TD05H housings.

Run more boost, port the wastegate hole and add a 34mm flapper, add restriction to your exhaust system, or just deal with the problem seem to be your only options. It's not going to go away on it's own.

 

[Absit]

Sounds like your average Evo 3 16G with a big exhaust..

 

[v8killer]

The Evo III has a completely different turbine housing which flows better than any of the standard TD05H housings.

Run more boost, port the wastegate hole and add a 34mm flapper, add restriction to your exhaust system, or just deal with the problem seem to be your only options. It's not going to go away on it's own.

Yes i plan on running mid to upper 20's on meth and 93 pretty much what ever it can handle but i was just making sure i didn't have a problem with controlling it at the higher boost levels. I'll start cranking it up and see what happens. Thanks !

 

[JusMX141]

More boost = more backpressure, and that's exactly what that wastegate system needs to function properly.

If you were to port the wastegate hole and / or add a 34mm flapper to control the boost now it would never allow you to reach your goal later unless you were to go external. There is not enough spring tension in the MHI actuator to hold a larger flapper shut above 22-23psi.

 

[Sirnixalot]

I have done the Mr. Peepers mod to my actuator but i still get creep to 24-25psi so the next step is porting the turbine housing and converting to a VTA dump on the O2 housing.

 

[v8killer]

More boost = more backpressure, and that's exactly what that wastegate system needs to function properly.

If you were to port the wastegate hole and / or add a 34mm flapper to control the boost now it would never allow you to reach your goal later unless you were to go external. There is not enough spring tension in the MHI actuator to hold a larger flapper shut above 22-23psi.

yes i know the horror of the large flapper, thats why i wanted to figure out if the creep was from the housing or the actuator. I'll crank the boost up in the 20's later and see how it goes. Thanks

 

[Iroc_g]

Mine was similar. Cranking the boost helped a little, but not much. I never did try anything internal, because it was a temporary turbo for me anyways.

That internal waste-gate is not sufficient for 99% of the people that have them. Porting and larger will probably do the trick. That, or just go external.

 

[b00st3d4g63]

When I had my 16g it never creeped once I had it at 22lbs. That was with a 3'' exhaust and the smaller flapper door. Once you turn the boost up it will be fine.

 

[v8killer]

When I had my 16g it never creeped once I had it at 22lbs. That was with a 3'' exhaust and the smaller flapper door. Once you turn the boost up it will be fine.

considering mine is creeping to around 21-22 thats probably the sweet spot to when it will start to control it. I hope thats what happens when i turn it up !

 

[Tanro]

Just port your o2 Housing, collector, and Hotside Housing.


It basically sounds like an average 16g with a big exhaust. If your rocking a test pipe, put back on the cat until you can afford to have your stuff ported.

 

[v8killer]

Just port your o2 Housing, collector, and Hotside Housing.


It basically sounds like an average 16g with a big exhaust. If your rocking a test pipe, put back on the cat until you can afford to have your stuff ported.

It should be fine i plan on running upper 20's of boost with meth injection.

 

[UofACATS]

more backpressure, that's exactly what that wastegate system needs to function properly.

Exactly. And this is why this works:

http://www.dsmtuners.com/forums/152313115-post19.html

Easy-enough solution to run the stock downpipe and cat when I want wastegate boost, and my 3" DP and a couple turns of the MBC otherwise.

Another idea is to v-band the muffler for easy removal (and access) and run a 2" muffler.. huge exhaust restriction.