help dyno day was dissapointing whats wrong
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help dyno day was dissapointing whats wrong well first off i got 6.0 lq9 trqr2 cam matchn springs, stage2.5 5.3 heads ls6 intake 38lbs injectors portd tb ud pulley 1 3/4 lt headers 3" custom y built trans 3200stall 373gears. well i pulled 345rwh unlocked crank 410hp.tuner said my injectors were running 92% and car was running real lean on topend so i odered ractronix 255 with hot wire. will this fix my problem or is there smthing wrong????? plez help
Why not just take it to a tuner that knows his ****? I mean my guy charges like $300 bucks and by the time you get all your tuner stuff aren't you going to be there already? These motors are pretty much a bitch when you get all ur **** on them
Your numbers seem a bit off. I know that locking the converter can give higher numbers. But I don't see it adding that much to it. I would start with the simple things. Changing your fuel pump/ plug & wire check. Was it tuned for 38lb injectors? What was the timing and AFR?
Always possible the throttle body blade wasn't opened up all the way?
Always possible the throttle body blade wasn't opened up all the way?
Thread Starter
Teching In
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the car is tuned and the tuner was at the dyno pull he was tuning between the pulls.the plugs are new ngk tr55 wires are stock .tuner said car is running fine untill topend then it starts running realy lean .i just got my racetronix pump i just finished installin it so well findout sat.im going back to dyno and tuner will retune.
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what type of dyno?
92% duty cycle though high should still not have the car into a lean condition
The current injectors should be fine and only be that high of a duty cycle if it was actually dropping fuel pressure. was that verified?
3200 converter unlocked would be worth maybe 10 rwhp
92% duty cycle though high should still not have the car into a lean condition
The current injectors should be fine and only be that high of a duty cycle if it was actually dropping fuel pressure. was that verified?
3200 converter unlocked would be worth maybe 10 rwhp
Thread Starter
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he didnt check fuel pressure but i just installed racetronix pump lastnit n just conncted last wire to alt a few min ago.and drove it around everything seems fine so this weekend hopefully will take it back for dyno tune.it did smell like carbon out the exaust though think its rich now?i no i have to retune
Sounds kind of shady just cause the lack of seriousness but idk the situation but if there tune does not work this next time around for you try out a mail order tune by frost . Only good news have I read from there mail order tunes.
That depends totally on what type of converter it is. All 3200 converters are not created equal. Some may only have a 10 hp gain or loss, others can have significantly more. It also depends on the engine, and how it makes torque. The same 3200 converter will act differently behind 2 different engines with different power making characteristics.
I would ask the tuner:
What was the AFR when it leaned out?
When it leaned out, was the injector at 92%?
If so, why didn't he add more fuel to it? (He had room to run the injectors up to see if it was the fuel pump not keeping up).
What was the fuel pressure?
What was the timing table set to (max timing)?
It's your car and your tuner should be able to answer any and all questions you have. But, if you don't know what to ask, well, you can't ask it.
To those that say he is using a shaddy unreputable tuner, you don't know who he is using and if he isn't armed with the right info to ask, well, you can't put it back on the tuner with out the full story. Just sayin..
What was the AFR when it leaned out?
When it leaned out, was the injector at 92%?
If so, why didn't he add more fuel to it? (He had room to run the injectors up to see if it was the fuel pump not keeping up).
What was the fuel pressure?
What was the timing table set to (max timing)?
It's your car and your tuner should be able to answer any and all questions you have. But, if you don't know what to ask, well, you can't ask it.
To those that say he is using a shaddy unreputable tuner, you don't know who he is using and if he isn't armed with the right info to ask, well, you can't put it back on the tuner with out the full story. Just sayin..
Thread Starter
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i hear u bro im not trynig to blame the tuner just trying to figure out whats going on with my car and i am a newbie to this sport although im mechanicly inclined. well he did add more fuel but pump wouldnt give it .and he said it was lean an injector were running at 92% on topend . i got the sheets just not sure how to post them.timing i dont no should his laptop had said the fuel pressure ?if so he didnt tell me