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822 Posts
See what this sounds like to all you force induction savvy members out there.
Setup:
GA16DE
259cc injectors
S-AFC 2
SR20DET T25 turbo
Yesterday, when I drove to work, my car felt rather sluggish. So, on the way home, I tried to bring it back to life by getting on boost. Normally, around 26% throttle or so, my T25 spools up to 5 lbs in 2nd gear, and then creeps up to 8 lbs fairly quickly. Yesterday, it took until nearly 3800-4000 rpm to reach 5 lbs of boost, when it is pretty much normally instantaneous. It was almost impossible to get 8 lbs (it took a 2nd to 4th gear pull to hit it).
So, when I did get home, I decided to check out everything I thought it could be. I let the engine cool down, and checked the spark plugs first of all for signs of leaning out or detonation. The plugs themselves were a slight bit white, but that was from when we first tuned the car and didn't have the air/fuel mixture correct. No signs of detonation or impact. Next, I allowed the car to heat up, and then used the soapy water technique to test for boost leaks (my next thought). No leaks were discovered!
This only started happening yesterday! The turbo sounds fine, spools up with no problems (you can hear it and no unusual noises from it), doesn't leak any oil, and no oil out the exhaust or white smoke. I am going to do a compression check this afternoon, but I seriously doubt my head gasket is gone (the car runs acceptable without boost just sluggish). I am going to change out the spark plugs anyway, as well as remove the inlet to the turbo and check for shaft play. My friend (who has quite a lot of turbo experience) thinks that it is just bad gas (I run 93 octane), since I filled up on Saturday and this started Monday (I didn't drive the car on Sunday). I put in some octane booster last night, and it did seem to help initial response. Any ideas????
Setup:
GA16DE
259cc injectors
S-AFC 2
SR20DET T25 turbo
Yesterday, when I drove to work, my car felt rather sluggish. So, on the way home, I tried to bring it back to life by getting on boost. Normally, around 26% throttle or so, my T25 spools up to 5 lbs in 2nd gear, and then creeps up to 8 lbs fairly quickly. Yesterday, it took until nearly 3800-4000 rpm to reach 5 lbs of boost, when it is pretty much normally instantaneous. It was almost impossible to get 8 lbs (it took a 2nd to 4th gear pull to hit it).
So, when I did get home, I decided to check out everything I thought it could be. I let the engine cool down, and checked the spark plugs first of all for signs of leaning out or detonation. The plugs themselves were a slight bit white, but that was from when we first tuned the car and didn't have the air/fuel mixture correct. No signs of detonation or impact. Next, I allowed the car to heat up, and then used the soapy water technique to test for boost leaks (my next thought). No leaks were discovered!
This only started happening yesterday! The turbo sounds fine, spools up with no problems (you can hear it and no unusual noises from it), doesn't leak any oil, and no oil out the exhaust or white smoke. I am going to do a compression check this afternoon, but I seriously doubt my head gasket is gone (the car runs acceptable without boost just sluggish). I am going to change out the spark plugs anyway, as well as remove the inlet to the turbo and check for shaft play. My friend (who has quite a lot of turbo experience) thinks that it is just bad gas (I run 93 octane), since I filled up on Saturday and this started Monday (I didn't drive the car on Sunday). I put in some octane booster last night, and it did seem to help initial response. Any ideas????