Chance

I was wondering if something could be wrong with a turbo even though it makes boost? My turbo spools up pretty quick but I can't feel the power come on. Really laggy and comes on slow and not hard at all. I took off the TID and it feels fine and spins freely. It's the original stock turbo w/150,000+ miles on it. Even though it boosts, could there be something wrong?

Chris Ng

make sure that your double throttle plates are actually working..
These plates are semi mechanical/vacume operated and have been known to remain shut or not fully open when they are supposed to.. Main cause of this would be a faulty checkvalve..
You would still build boost and show good boost on your boost guage, however you will not be getting the full flow past the throttle body .. to check if it's working correctly, warm up the vehicle, remove the intercooler.. remove the rubber hose connecting the IC to the throttle body and stick your fingers into the TB .. you should feel a set of plates.. now actuate the throttle linkage (or have someone step on the gas pedal) you should feel the plates opening up (there will be a slight delay in the operation)
If they don't open then you have found your problem.. there is a green/white checkvalve connected in line to the vac hose that runs to the diaphram that operates the linkage for the plates.. check to make sure it only allows flow one way.. you can also just wire the plates open...

turboedRX-7

Do you have stock exhaust? If so, its possible that your pre or main cat is clogged as well. my 88 T2 had 111k when I bought it and doing the Bonez DP & MP made a huge dif! Good luck!

Chance

Thanks for the responses guys. I removed the secondary throttle plates many months ago when you(Chris Ng) mentioned something about a checkvalve related to that on some other post a long time ago. I was really hoping that would be the problem, but alas, it wasn't ;( As far as cats go, I have none. I have a 3"dp and 2.5" mp with a Greddy Power Extreme taking care of the rear. I have been chasing this problem for over a year. Changing this and that when I could afford it, being on a student budget and all(no money). I also changed the fuel filter, plugs and wires, vacuum hoses, new TID from FattyFC3S(thanks Graham). What it sounds like is if the turbo is making boost, then it's probally ok right? How about a bad cpu then? I've been told that once in a while a car will be equipped with a bad ecu and nothing but a replacement would rectify the problem. Anyone have any experience with a bad ecu? I've hit 10lbs. of boost without a FCD, so I suppose it could be possible. I do have fuel taken care of for my mods with a Walbro and SAFC. Let me explain the problem a little more clearly. I get on the gas, boost builds, I can hear the turbo for sure, and when I let off the gas, the Apexi bov assures me that I made boost. Thing is, the car pulls to redline with ease, it just doesn't feel like it's getting assistance from the turbo, and when it does, it's nothing dramatic by any means. You almost have to convince yourself that the turbo did something. Lame, I know. Flush the intercooler maybe? What's the best way to do this? Sorry for the length. Just getting kind of desperate here.