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Thread: Stutter/Miss on higher than stock Boost.

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Posts: 21-29 of 29
2009-04-26 04:22:31
Do you have a FMIC? Check all your intake piping, and what turbo are you running on that car?
2009-04-26 04:25:30
You have BOV? Recirc or atomsphere?
Do you have a wideband?

if your vented to atomsphere and your BOV is leaking from the higher boost ----theres your leak.... WB would probably show your running richer than usual.
2009-04-26 05:30:37
Im using a HKS bov, no i don't have a wideband.
2009-04-26 05:31:15
Originally Posted by 92BoostedSER
Do you have a FMIC? Check all your intake piping, and what turbo are you running on that car?

Yes Front mount piping have been checked and nothing seems to be wrong, Standard T25 right now
2009-04-26 05:38:31
Originally Posted by Brendan
Well - I have fixed the problem. I swaped the leads with my spares and the miss is gone! Another problem/issue im having, if i floor it in a low gear when set on 15psi, it will hit 15 then swing back to 10/11

You have a t25. The only fix for that is a bigger turbo. T25's cant hold 15psi for the whole trip to redline. They start to fall back off to 12psi at a certain points in the rpms. You probably dont see that in the higher gears because it takes longer to get to that rpm where the T25 runs out of steam...
2009-04-26 05:41:59
Yeah thats what my mate said, it also does the bounce thing at 12psi.

I have a bigger turbo going on soon, Ether a GT28R or RS. Depends if i can sell my R before i want the upgrade to happen. Just sorting out these issues before all this happens.
2009-04-26 13:55:22
I would upgrade your injectors when you go to that 28R or RS. At a minimum you need to run the 370's at 4bar fuel pressure.

You'll need a wideband. You need to recirculate your BOV if you're running a draw thru setup. otherwise, a blow thru doesn't require recirculated BOV.

3" exhaust is a must.

Pressure testing the turbo system is a must, as well.
2009-04-26 14:52:03
I'm sure tekkie can attest to this... because he replied to my post. but my Avenir blew up @ 14lbs with a t25 so just keep that in mind, i dont know if you have aftermarket pistons/rings etc.

My post is called "Here was the culprit..." take a look at it and see what happened
2009-04-26 19:00:52
I have 740cc injectors going on - overkill but they were only $5 more than 555's new. As well as z32 maf n a dyno tune. Will be going to 3" on the bigger turbo setup. Will look into all the other info - thanks
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