The boost tapering .75 psi instead of 3 to 5 psi like previous is a great improvement. That minimal boost taper at the top end is probably a mix of turbo qualities and a subpar wastegate design. I lose 5 psi after 4500 to redline with the exact same turbo and exhaust (with the resonator) setup as Tig.

 

a long time ago i did drop the exhaust and it dropped boost, but i found that i had other issues, like the exhaust flanges were loose.

recently i dropped the exhaust after i got everything else fixed, and it held boost perfectly.

before i did the tranny stuff, i would drop down to less than 4500 between shifts, and the boost would start to drop past 4500, now i guess with the new flywheel and clutch, when i shift it never drops past 5000, and the boost holds strong.

 

that is insane - at first i thought the pic showed smoked oil buildup?!? good catch.

 

I glad that you remebered what Peter said about high exhaust back pressure being the main issue with Tig's boost drop. I suspect that Tig had multiple problems at once and it can become very confusing as to what the real problem is. Tig also had a boost leak before the turbocharger (one loose turbo flange nut), once this was rectified any boost drop had to be caused by a restrictive exhaust, awesome to see that TIG is finally sorted for now.

 

true, peter was partially right, i admit it. kinda misleading tho when i called JIC and they said it was a 3" ID resonator. now i have to get the hole in the exhaust housing of the turbo fixed.

 

Tig i hate to say but that is funny as hell. Happy to see you have the boost problem fixed now.

 

yep, after all that, it in fact was the exhaust.

 

Is there really a non-resonated version???

 

Sharif
Wow - New Word - CouldntFuggenBelieveIt !

Tig - Glad you found that one.. I wonder how many other's are out there?

Cheers Amy -

 

fair enough - obviously, that's not 3" ID.

how are you going to fix that hole? can you weld a blob in there and grind it smooth?

ahm

 

i dont know about the hole, its in the cast housing. im working on it.