I put on a 2.5" RB DP to a resinator and exhaust shop made for me to a RB 2.5" cat-back and now im only boosting 4psi!!!! I do not have a FCD or ported waste gate, my air pump is still hooked up but its not hooked to the exhaust, I was thinking maybe boost creep or fuel cut what you guys think???

THANKS

:-(

So you have no cats, what boost gauge are you running, and is it accurate?

no cats the resinator the exhaust place put on i cant see through but they said it still flows pretty good alot better then the cat, and Its almost as quiet as when I had the cats on. I have a autometer boost gauge and its reading the same as befor.

just went and drove it again turns out in 1st im only getting 2-3 psi 2nd and 3rd 4 close to 5 psi befor with all the cats on i was gettin 5 consistintly

Exhaust leak before turbo or boost leak?

Im gonna check it out after I get out of work in an hour, someone also said that the resinator the exhaust shop put on could be to restrictive.

No ive seen what a resinator looks like, the are pretty much smaller halowd out cats, that wouldnt be restrictive, I think they are just to keep the noise down. Like 1revvin said about, check for boost leaks, do you hear any hissing by the turbo? I was getting at least 5psi stock in 1-2nd gear and 6-7 in 3-5th. So prob leaking, or ur turbos bad.

I found one leak the turbo inlet pipe is cracked I taped it with some high temp sillicone tape for now till i get a new one and I left the Air pump off I got 4-5 in first but it bogs down a lil at 6,000 rpms and the boost drops to 3PSI, in second its 5 PSI but bogs a lil at 6,000 RPMs. I can here what sounds like a leak behind the intercooler or down by the downpipe but cant find it tonight its to dark.

I can see that the pruge control valve is cracked as well would that make a differance?

Pruge control valve? You mean the ACV, that could because its on the Mani, if its crcks it could be leking manifold pressure.

no the purge control valve is under the intercooler, its a black circle thing and has two vac lines at the bottom and one comming out the top. I caped the lines and had no change.

here is a link of a diagram with the purge valve and what it does.

http://www.geocities.com/huguesdc1/evapcrank.html

Just for a long shot - check the waste gate actuator link.

It's only held on by a dinky snap ring.

It may be unhooked.

Also I didnt even think, like stated above, check the actuator line, the little vac line that runs from the turbo to the WG, it could be loose or craked.

If a waste gate pressure line comes loose or gets pinched, boost will go high...



My guess - if it's not a boost leak, the waste gate is not closing.

Well I already checked the link and its connected. Im gonna take off the actuator and check that when i remove the rats nest and change my UIM=>LIM gasket. also check this link to rx7club where i have been talking about this as well.

Thanks for the help keep it commin lol.

http://www.rx7club.com/showthread.php?t=397586

New info I made a custom TID and now boost is at 5 in all gears all the way through redlin, chirps in 2nd and 3rd. Im gonna go to the exhaust shop tom and have them put on a straight pipe and see if its mabe the silencer thing they put on. Also I dont think there is and it may be a stupid question but theres no boost controler or regulator on a s4 TII is there???

The S4 boost is controlled by a small pill in the wastegate actuator line. Thats it. The S5 is controlled (poorly) by the computer via solenoid valve.