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month or so ago I bought a sr20 front clip from phase2motortrend. I picked it up and was told it appeared to be a type x black top but the valve cover had been changed. It does have the fins on the front of the head and has a J4 ecu. However little things like the o2 sensor suggest redtop. Is there any way to determine for sure what my motor is?

since my swap - I ran stock o2 housing with about 3 inches of downpipe. Ran fine - But would bog down coming off a hard accel. really similar to how people with atmospheric bov cars run. But mine is all stock. Has boost controller to raise to factory 11psi. Figured it was iacv.

I recently installed my isis complete exhaust turbo back. figuring it was a black top so I didn't order the o2 sensor adapter. When installing I found that I actually had a skinny o2. I did some research and a few guys on zilvia said a fat o2 from a z32 tt would work. So I went down to the parts shop and got myself an o2 sensor. 3 wire sensor - 2 white and a black. Did some research the red and white in my factory harness were heater circuit and the black was the signal. Anyways. I installed installed the sensor and exhaust and ran how it did before only quieter. Put 200 miles on it and it started acting up.

Runs great when it's cold. Soon as it warms up it misses a little. now it bounces from 500rpm to 1500rpm at idle runs very very rich and misses a lot. I've verified fuel pressure without vacuum at roughly 44 psi - 35ish with vacuum applied. It does respond to throttle. It also holds fuel pressure for at least 30 minutes after shut off. I also checked my plugs. They have roughly 1000 miles on them and are carbon fouled. I cleaned them up and verifies gap at .030". Reinstalled. Cleaned IACV and MAF, verified resistance in injectors at 11-12ohms. Cleaned pcv valve and verified operation.

I am waiting for my o2 sensor adapter to reinstall my old skinny o2 sensor - it will be here today. I removed my air filter (cone) to see If that is restricting flow. If the problem continues I'm going to use the smoke machine at work to fog my intake and see if I have any leaks and try checking for a boost leak all though I'm not super sure how to go about it. I don't have access to a timing gun but I can verify timing marks.

Sorry for the novel - I really want my car to run smooth. I'm only getting 175 miles on 13 gallons. It's killin me. If anyone has ideas. I've been searching for the last week for forum posts about this. I've checked nearly everything. was hoping to get some insight.

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