Szester Posted September 1, 2008 Report Share Posted September 1, 2008 OK, so i just bought dans car if you know who he is. Its really nice and runs great. However i need a bit of help with it. At high revs the turbo likes to fluctuate between around 10 to 15 psi. Its set to 15 psi but wont stay there solid. I want to make the wastegate hole bigger to try and solve this problem, it will kill my times at the speedway if i let it be. Is there anyone here that has done that before? Also does anyone know a good place to buy knew rotors and pads for the 5 lug? Link to comment Share on other sites More sharing options...
Scotty Dont Posted September 1, 2008 Report Share Posted September 1, 2008 i ported my wastegate because i am running a 20g. What turbo do you have? It could be because of a poor wastegate actuator/vac lines/boost contoller so check those things first and also check all of your intercooler piping for leaks Link to comment Share on other sites More sharing options...
Szester Posted September 1, 2008 Author Report Share Posted September 1, 2008 i ported my wastegate because i am running a 20g. What turbo do you have? It could be because of a poor wastegate actuator/vac lines/boost contoller so check those things first and also check all of your intercooler piping for leaks thanks for the tip, im new to this turbo thing. appreciate the input Link to comment Share on other sites More sharing options...
Technology Posted September 3, 2008 Report Share Posted September 3, 2008 Yeah, you must have a boost controller of some kind to raise it higher than 10psi, perhaps you should try a different one to be sure it's not just that. Also, you might try and do a boost leak test, and as Mr. Don't said above, it could be dry, cracked vacuum lines. Link to comment Share on other sites More sharing options...
Szester Posted September 4, 2008 Author Report Share Posted September 4, 2008 Yeah, you must have a boost controller of some kind to raise it higher than 10psi, perhaps you should try a different one to be sure it's not just that. Also, you might try and do a boost leak test, and as Mr. Don't said above, it could be dry, cracked vacuum lines. alright, thanks. the lines are fine. so i guess ill be redoing the wastegate this winter Link to comment Share on other sites More sharing options...
mikec Posted September 5, 2008 Report Share Posted September 5, 2008 What year car? If it's an 88-later with the 3-port style wastegate and the boost control solenoid (mounted to the air filter lid) you might be experiencing engine knock. When knock is detected, the solenoid cuts out, forcing the wastegate actuator to use the "low pressure" side in an effort to eliminate knock and protect the engine. Then when the knock is gone... the system reverts back to normal high pressure mode. You can wire up a 12volt LED (or a plain LED and a 1000 ohm resistor in series) to the white connector on the solenoid. It should light up for NO KNOCK. If the LED blinks out, you're experiencing knock and have other issues. If the LED doesn't light at all... reverse the connections. The 88-later cars with 5-speed trannies also use this solenoid to limit boost pressure until the RPMs are above 4000. There is a simple one-wire mod trick in the FAQ to remove this low-RPM boost limit. mike c. Link to comment Share on other sites More sharing options...
Szester Posted September 5, 2008 Author Report Share Posted September 5, 2008 What year car? If it's an 88-later with the 3-port style wastegate and the boost control solenoid (mounted to the air filter lid) you might be experiencing engine knock. When knock is detected, the solenoid cuts out, forcing the wastegate actuator to use the "low pressure" side in an effort to eliminate knock and protect the engine. Then when the knock is gone... the system reverts back to normal high pressure mode. You can wire up a 12volt LED (or a plain LED and a 1000 ohm resistor in series) to the white connector on the solenoid. It should light up for NO KNOCK. If the LED blinks out, you're experiencing knock and have other issues. If the LED doesn't light at all... reverse the connections. The 88-later cars with 5-speed trannies also use this solenoid to limit boost pressure until the RPMs are above 4000. There is a simple one-wire mod trick in the FAQ to remove this low-RPM boost limit. mike c. Well, its an 87. However the wastegate is aftermarket. Im not sure whether its 3 port but ill have to look into that. Link to comment Share on other sites More sharing options...
Szester Posted September 5, 2008 Author Report Share Posted September 5, 2008 What year car? If it's an 88-later with the 3-port style wastegate and the boost control solenoid (mounted to the air filter lid) you might be experiencing engine knock. When knock is detected, the solenoid cuts out, forcing the wastegate actuator to use the "low pressure" side in an effort to eliminate knock and protect the engine. Then when the knock is gone... the system reverts back to normal high pressure mode. You can wire up a 12volt LED (or a plain LED and a 1000 ohm resistor in series) to the white connector on the solenoid. It should light up for NO KNOCK. If the LED blinks out, you're experiencing knock and have other issues. If the LED doesn't light at all... reverse the connections. The 88-later cars with 5-speed trannies also use this solenoid to limit boost pressure until the RPMs are above 4000. There is a simple one-wire mod trick in the FAQ to remove this low-RPM boost limit. mike c. You win 5 free internets sir!! Thanks for the tip. All taken care of. Problem solved Link to comment Share on other sites More sharing options...
mstieg Posted September 6, 2008 Report Share Posted September 6, 2008 You win 5 free internets sir!! Thanks for the tip. All taken care of. Problem solved Glad to hear it! ...but what was the problem and how did you solve it? Can't have this post end without an answer for readers to learn from now! Link to comment Share on other sites More sharing options...
Fullbore576 Posted September 6, 2008 Report Share Posted September 6, 2008 Yes please!!!!what was the problem???? Link to comment Share on other sites More sharing options...
Szester Posted September 6, 2008 Author Report Share Posted September 6, 2008 Yes please!!!!what was the problem???? i needed higher octane gas. Yes, my last run to the gas station i had gotten cheaper fuel. It wont happen again. Link to comment Share on other sites More sharing options...
Szester Posted September 6, 2008 Author Report Share Posted September 6, 2008 Yes please!!!!what was the problem???? the lower octane gas was causing engine knock basically Link to comment Share on other sites More sharing options...
hunter1 Posted September 15, 2008 Report Share Posted September 15, 2008 Hey man Nice to see you took my advice to join the boards, and I did warn you about the gas, cant say I didn tell ya, Link to comment Share on other sites More sharing options...
ernielist Posted December 19, 2008 Report Share Posted December 19, 2008 What year car? If it's an 88-later with the 3-port style wastegate and the boost control solenoid (mounted to the air filter lid) you might be experiencing engine knock. When knock is detected, the solenoid cuts out, forcing the wastegate actuator to use the "low pressure" side in an effort to eliminate knock and protect the engine. Then when the knock is gone... the system reverts back to normal high pressure mode. You can wire up a 12volt LED (or a plain LED and a 1000 ohm resistor in series) to the white connector on the solenoid. It should light up for NO KNOCK. If the LED blinks out, you're experiencing knock and have other issues. If the LED doesn't light at all... reverse the connections. The 88-later cars with 5-speed trannies also use this solenoid to limit boost pressure until the RPMs are above 4000. There is a simple one-wire mod trick in the FAQ to remove this low-RPM boost limit. mike c. Hey mike I have an 89 5 speed, where can I find that mod that removes the low rpm boost limit? Link to comment Share on other sites More sharing options...
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