Why am I boosting at 12?, Still stock, thought max at stock was 10... Options

[Green_MachToy]

I had a stud in the Exhaust manifold break at the head. In repairing it, my car is now pushing 12 pounds. I still have the stock ecu, no boost controller (until tomorrow), no FCD (stock max is 9.7). Now to give you a few more specifics: A friend of mine put a plastic t in my lines to trick the wastegate into allowing more boost. This caused me to reach 10 (probably 9.7, but meter isn't that detailed). In doing the repair I took the t out. I also found that my Cat was bad and took it out as well (it will cost me $300 to fix later). Replaced a crush gaskit after the stock down pipe to the 3" exhaust. Got everything together at approx 0130, and took it for a test drive. Found a couple of vacuum lines had worked themselves off of the stock BOV. Fixed those, and off again. Ran at stock 7 pounds of boost. Placed the t back in, ran at 10. Next day...got in the car got on it to pass a car...14! Took the t out, down to 12! It does seem to creep. When I hit the gas, it will jump to about 8-10, then steadily walk up to 12 as the rpm's increase. Did my wastegate go bad? I was thinking the increased flow in the exhaust from having no cat may have been the problem but it ran stock the night I did everything. Any ideas?

This post has been edited by Green_MachToy: Dec 5, 2005 - 8:34 AM

[lagos]

you said your friend did something to the wastegate to trick it. put all that back to stock. that maybe why your creeping to 12psi and not just hitting it. or just install in a boost controler and set it to 16psi.

good to know that the 3rd gen swap needs wiring too. i always wanted to know if it was plug and play or not.

edit: does your cel light work? is it throwing any codes?

This post has been edited by lagos: Dec 5, 2005 - 11:24 PM

[Green_MachToy]

you said your friend did something to the wastegate to trick it. put all that back to stock. that maybe why your creeping to 12psi and not just hitting it. or just install in a boost controler and set it to 16psi.

good to know that the 3rd gen swap needs wiring too. i always wanted to know if it was plug and play or not.

edit: does your cel light work? is it throwing any codes?

Yes, it works. I had it checked and was told it is saying there is something wrong with the abs. They used the codes from a 95 MR2, though. Not sure if that was right. It is still on as I am not sure what is wrong. The clip I got did not have ABS, so I think it is a bogus reading.

I took that T out when I ran it the first night. I was at 7. put the t in and went to 10. Then I jumped up to 14 in the same configuration (the next day, somehow). Took the t out and it dropped down to 12. I had been running for a year at 7 pounds, then by changing the stud, de-cating the downpipe, putting a crush gasket from the downpipe to the exhaust - I am at 12.

WHAT DOWNPIPE ARE YOU USING???

Stock ST205 downpipe to custom exhaust.

This post has been edited by Green_MachToy: Dec 5, 2005 - 11:51 PM