shitty day at the dyno. need some help!
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TECH Apprentice
Joined: Feb 2010
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shitty day at the dyno. need some help! took my car for a dyno tune and in the 2nd pull we where having fuel issues. wot it has about 40 psi. he said he has so much fuel going to it at shouldnt even run. where are seeing about 13- 15 air/fuel and its leaning out. its got stock pump and injectors. the next issue is that once it hits 3rd gear it misses so bad and it leans out. im running delco platinums. could changing plugs help and the wires are new delco idk wat to do. we only saw 270rwhp!
Thread Starter
TECH Apprentice
Joined: Feb 2010
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it was lean the whole time and he added so much fuel that normally it shouldnt run but it kept leaning out in our case. he was just tellin me it shouldnt even be running with how much fuel itsgetting
Your first mistake was to take the car to the dyno with a miss in 3rd gear. It doesn't do you any good to take it to a dyno when it isn't running in perfect condition. You should track down the source of your misfire and get the car running PROPERLY before you strap it to the rollers. Next...
We need far more info on your car. Who ported the heads, what kind of exhaust, CAM SPECIFICS, who did the tuning, etc. Did your tuner monitor your injector duty cycle? You might be maxing your stockers out (a likely scenario), but once again we don't know anything about your engine/combo. Was this a dyno tuning SESSION or just a 3-pulls-for-$50 thing?
There's nothing wrong with your fuel pressure BTW. 40psi at WOT is fine.
We need far more info on your car. Who ported the heads, what kind of exhaust, CAM SPECIFICS, who did the tuning, etc. Did your tuner monitor your injector duty cycle? You might be maxing your stockers out (a likely scenario), but once again we don't know anything about your engine/combo. Was this a dyno tuning SESSION or just a 3-pulls-for-$50 thing?
There's nothing wrong with your fuel pressure BTW. 40psi at WOT is fine.
Thread Starter
TECH Apprentice
Joined: Feb 2010
Posts: 319
Likes: 0
Your first mistake was to take the car to the dyno with a miss in 3rd gear. It doesn't do you any good to take it to a dyno when it isn't running in perfect condition. You should track down the source of your misfire and get the car running PROPERLY before you strap it to the rollers. Next...
We need far more info on your car. Who ported the heads, what kind of exhaust, CAM SPECIFICS, who did the tuning, etc. Did your tuner monitor your injector duty cycle? You might be maxing your stockers out (a likely scenario), but once again we don't know anything about your engine/combo. Was this a dyno tuning SESSION or just a 3-pulls-for-$50 thing?
There's nothing wrong with your fuel pressure BTW. 40psi at WOT is fine.
We need far more info on your car. Who ported the heads, what kind of exhaust, CAM SPECIFICS, who did the tuning, etc. Did your tuner monitor your injector duty cycle? You might be maxing your stockers out (a likely scenario), but once again we don't know anything about your engine/combo. Was this a dyno tuning SESSION or just a 3-pulls-for-$50 thing?
There's nothing wrong with your fuel pressure BTW. 40psi at WOT is fine.
Thread Starter
TECH Apprentice
Joined: Feb 2010
Posts: 319
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well for one we figured the miss was from timing or fuel related tune issue. the motor is a 355, cam is a cc 210/220, 510,520 i believe. stock rockers and upgraded springs. heads are stock pp by a local who seemed to do a good job. im not sure if he monitored the duty cycle or not. and this was a dyno tune.
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Get rid of those junk *** platinum plugs man, those things are turds, run some autolight 104s or NGK 55s, i had platinums in a s10 once brand new and they missed so ******* bad, changed them to ac D rapid fires and no problems
