#1 |
I was wondering why I could never hit 18 psi steady all this time, so I did some changes. First I removed the BOV setup I had, and put back on the stock I/C. Then I changed the gillis valve around. Instead of running a vac line from the vac tree to the inlet of the gillis, I put in the T-fitting on the compressor housing, capped off one side of the T, and ran a vac line from the t-fitting, to the inlet end of the gillis. Then I ran the other vac line to the outlet to the WGA. So now I have the vac lines as short as possible. I checked timing and it is still set at 10 BTDC. I recently changed the d-cap, rotor, plug wires. Changed plugs 10k miles ago (I can't remember what the gap was, I guess I set it what the little sticker says on the fan shroud.
I also, just filled up on 93 octane fuel, and added a bottle of Crown Octane Booster.
After I hooked up the gillis, I checked a lot of the vac lines and made sure they were tightened down. I did NOT change the EGR emission hoses, the main I/C vac hose, or the vac hoses that run through the left side of the body. I never changed those little vac filters that are in the main I/C vac line.
I have a boost gauge installed and at idle in nuetral, its about 18 Hg. vac. When riding along without throttle, it runs at about 20/21 Hg. vac.
WHen I did the gillis test, I ran it with about 4-5 threads showing and got like 14/15 psi. I slowly tightened it in, but it wasn't going anywhere hardly. I'm down to about 2 threads left, and I hit about 16 psi. It feels like it looses a couple psi boost. For example, in 2nd, when you floor it, it goes to about 16 psi, but then at the end of 2nd, at like 5000 RPM, it will be down to 15/14.
I started hearing detonation, well I THINK i did. I don't know for sure what detonation sounds like, but I heard this faint sound coming from up in the engine comparment, it almost sounded like peices of metal shaking, or something shaking. It wasn't very loud, and the car didn't do any type of bucking or anything. It's nothing you can feel from inside the car. Now I'm wondering if maybe the knock sensor THINKS it hears detonation, and is pulling timing out. Would this pull out boost too? I'm not using the BCS, but when the KS pulls out timing, will that pull out boost?? Or should the boost pressure stay the same no matter what kinda of the timing is pulled out?
I don't see how I could be detonating, everything seems to be normal, and with 93 octane plus octane booster, it seems impossible. What could lead to detonation? What could I check? EGR valve? I never pulled the codes, though I want to next week maybe. I'm afraid to pull out the KS and run it, because I don't wanna blown a head gasket or anything (eventhough I ran with the KS disconnected for awhile). The turbo is still the stock IHI, which was driven with stock setup for 89k, then when I got I turned up the boost and ran it harder than the previous owner, could my turbo be going soon? Could the turbo be wore out, not be able to put out 18 psi (it has 105k miles on it). Someone help! What should I check and what affects detonation?
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1988 TurboCoupe - 5 Speed
5"x8" K&N / Cold Air Intake, Gillis Valve @ 18 psi, HKS Super Sequential BOV, 3" DP, 3" Cat, Dual 2.5" UltraFlos, Centerforce Dual Friction Clutch, Pro 5.0 Shifter, Autometer Boost/Vac & Air/Fuel Gauges
I also, just filled up on 93 octane fuel, and added a bottle of Crown Octane Booster.
After I hooked up the gillis, I checked a lot of the vac lines and made sure they were tightened down. I did NOT change the EGR emission hoses, the main I/C vac hose, or the vac hoses that run through the left side of the body. I never changed those little vac filters that are in the main I/C vac line.
I have a boost gauge installed and at idle in nuetral, its about 18 Hg. vac. When riding along without throttle, it runs at about 20/21 Hg. vac.
WHen I did the gillis test, I ran it with about 4-5 threads showing and got like 14/15 psi. I slowly tightened it in, but it wasn't going anywhere hardly. I'm down to about 2 threads left, and I hit about 16 psi. It feels like it looses a couple psi boost. For example, in 2nd, when you floor it, it goes to about 16 psi, but then at the end of 2nd, at like 5000 RPM, it will be down to 15/14.
I started hearing detonation, well I THINK i did. I don't know for sure what detonation sounds like, but I heard this faint sound coming from up in the engine comparment, it almost sounded like peices of metal shaking, or something shaking. It wasn't very loud, and the car didn't do any type of bucking or anything. It's nothing you can feel from inside the car. Now I'm wondering if maybe the knock sensor THINKS it hears detonation, and is pulling timing out. Would this pull out boost too? I'm not using the BCS, but when the KS pulls out timing, will that pull out boost?? Or should the boost pressure stay the same no matter what kinda of the timing is pulled out?
I don't see how I could be detonating, everything seems to be normal, and with 93 octane plus octane booster, it seems impossible. What could lead to detonation? What could I check? EGR valve? I never pulled the codes, though I want to next week maybe. I'm afraid to pull out the KS and run it, because I don't wanna blown a head gasket or anything (eventhough I ran with the KS disconnected for awhile). The turbo is still the stock IHI, which was driven with stock setup for 89k, then when I got I turned up the boost and ran it harder than the previous owner, could my turbo be going soon? Could the turbo be wore out, not be able to put out 18 psi (it has 105k miles on it). Someone help! What should I check and what affects detonation?
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1988 TurboCoupe - 5 Speed
5"x8" K&N / Cold Air Intake, Gillis Valve @ 18 psi, HKS Super Sequential BOV, 3" DP, 3" Cat, Dual 2.5" UltraFlos, Centerforce Dual Friction Clutch, Pro 5.0 Shifter, Autometer Boost/Vac & Air/Fuel Gauges