possible boost leak?

[Kyle_KleinSS]

Hey guys so Im not sure if I have an issue or not but here it goes. I have noticed that my dash gauge is buried with my current boost, but I can watch it go from 17 lbs down to about 12-13. I have an egr delete which has taken care of the boost drop off issue. Or should have. So now I am wondering if I have a boost leak issue. Its about the only thing I can think of. Pretty sure I dont have belt slip. But for the hell of it how can I check that as well? And does anyone know how to do a boost leak test?

 

[Kyle_KleinSS]

My tuner says it's most likely belt slip. I have a 2.8 with a 4lb. I also have the full billet flow idler kit. How can I check for belt slip

 

[MG0h3]

Look for belt dust around the blower snout

belt may look glazed too

 

[bigmoose]

Its normal. Your ported Eaton is out of steam. That combo is aggressive. My two previous cobras did the same with same combo and ported blower.

 

[Kyle_KleinSS]

That is strange it really doesn't happen until about 5k and up. I figured with the bleed off issue fixed it wouldn't have that problem.

 

[bigmoose]

Above 5k the blower cannot keep up with the motor which is why the boost drops off. Here is a video of my old cobra showing your exact issue.

https://youtu.be/-IHHkTnogK4

 

[Kyle_KleinSS]

Yea that sounds just like mine it drops at about the same rpm it sounds like.

 

[Kyle_KleinSS]

So here is question for you. If I were to drop to a 2.93 instead of a 2.8 would that make any difference in maxing out the Eaton?

 

[Black02GT]

Probably not just lose a little down off peak psi. Just trying to restate what's above its not like it's a heat thing or spinning too fast and getting cavitation. I just think it's simply the Eaton can't pump enough air into the intake to keep more that 14 psi or so when the 4V gets up in the higher RPM. The engine is pulling the air out of the intake faster that the blower can replace it to keep the pressure at that point.

 

[Black02GT]

Double post

 

[Kyle_KleinSS]

Stock ported tb/plenum. I did 492/525 on my dyno pull on 93. My tuner said they make right between 480-500 on his dyno. I just wanted to make sure I didnt have a different issue keeping me back. Would I gain alot from a dragon?

 

[Black02GT]

No not much, I got one because my ported blower came with the port match elbow so just ran with it. Posi did a back to back with the ported stock vs Accufab and Dragon. Article also talks about the bleed off your experiencing.

http://www.svtperformance.com/forums/showthread.php?664918-Ported-Throttle-Body-Testing