turbo nasty
Turbo Dojo / MNTR
- Joined
- Jul 19, 2001
Very true and then it will change as well once they have heat and work cycled.
What valve springs with 218-212 roller cam
- Thread starter quickturbo
- Start date
TurboTdr3.8
Well-Known Member
- Joined
- Jan 15, 2013
Very true
quickturbo
Member
- Joined
- Jan 15, 2012
I finally got around to installing PAC 1201 springs. I took it for a test drive and I still have the abrupt loss of boost / power around 5000-5200rpm. Car feels like you took your foot off the gas even though it's still WOT. I've data logged and it looks like the boost starts to drop out 1st but it's only about 1 frame (TT power logger) before everything else. I think I've replaced every sensor, left the stock style waste gate wide open (only made around 7-10psi at WOT this way) even converted back to MAF from TT speed density (used 2 different computers) I'm stumped. Anyone have any ideas ?
gunzandgearz
gearzandgunz
- Joined
- Aug 24, 2015
Just curious are you sure its not a fuel issue, I question this because if you think its boost pressure bouncing the valve off its seat then boost should be totally in way before that rpm, why isn't doing it down lower and the next question was it the same rpm as before with other springs and less spring pressure.
gunzandgearz
gearzandgunz
- Joined
- Aug 24, 2015
Just curious are you sure its not a fuel issue, I question this because if you think its boost pressure bouncing the valve off its seat then boost should be totally in way before that rpm, why isn't doing it down lower and the next question was it the same rpm as before with other springs and less spring pressure.
gunzandgearz
gearzandgunz
- Joined
- Aug 24, 2015
Just curious are you sure its not a fuel issue, I question this because if you think its boost pressure bouncing the valve off its seat then boost should be totally in way before that rpm, why isn't doing it down lower and the next question was it the same rpm as before with other springs and less spring pressure.
quickturbo
Member
- Joined
- Jan 15, 2012
Fuel pressure and AFR seems all good. I have a autometer fuel pressure gauge hooked up and a wide band hooked up. I'm actually running on the rich end at WOT and fuel pressure at the rails never drop
gunzandgearz
gearzandgunz
- Joined
- Aug 24, 2015
Did the rpm point change where it started laying down after stiffer springs?
quickturbo
Member
- Joined
- Jan 15, 2012
Nope. It's about the exact same. In the 5000-5200 rpm and then it falls on its face. Feels like I took my foot fully off the throttle.
quickturbo
Member
- Joined
- Jan 15, 2012
I've tried 3 different stock ignition/coil assemblies. All had the exact same outcome.
Yeah. A friend tried the same last week and the outcome was the same till he tried a known good one and the problem was solved.
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quickturbo
Member
- Joined
- Jan 15, 2012
2 of the 3 I tried came from running stock motors. Although my motor isn't stock anymore. What kind of HP will the stock modules support? I even tested them with a caspers module tester
A good stock module/coil has and will run well into the 8's if good and primary voltage is good and there's no other issues with the ignition. Seems like the bad ones seem to act up low 5000 rpm range. We duplicated it with one of them using the tester and gap extenders. Good strong spark till it got higher on the rpm then shut off. The car was off about 300hp over 5200rpm
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quickturbo
Member
- Joined
- Jan 15, 2012
Brian, can I give you a call tomorrow to pick your brain on this?
I had your number somewhere from the turbo I bought from you last winter.
I'll be tied up all week at BG. I probably won't be answering my phone till at least Friday afternoon
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fastblackracing
Well-Known Member
- Joined
- Apr 7, 2009
Are you still having issues with this?
turbotwister
FAST COMPANY PERFORMANCE
- Joined
- Oct 21, 2002
simple question.spark plug gap?
