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Street tune completed Z6/Vitara -results in slow acceleration/top end
Hi
Finally tune my vitara (130 psi comp all around) Z6 setup on the streets on crome pro/wideband/knock meter @ 8 psi, afr 11-11.5 on boost and 25 degrees of timming at 91 pump gas with no signs of detonation. My top end 6-7k feels a bit slow but i don´t know if feels like that for my low compression. Any suggestions?
I spy a log manifold in the background. My guess would be midrange has some boost creep and the power there feels nice.... then boost levels off and the manifold starts to choke out the top end.
We need a dyno graph or some data logging to give you more than just off-the-cuff suggestions
I spy a log manifold in the background. My guess would be midrange has some boost creep and the power there feels nice.... then boost levels off and the manifold starts to choke out the top end.
We need a dyno graph or some data logging to give you more than just off-the-cuff suggestions
Previously used a top mount with same top end result, so i think is a tune, spark plug gap or another problem.
Forgot to mention i´m using NGK 9s at .030 gap (factory gap)
Previously used a top mount with same top end result, so i think is a tune, spark plug gap or another problem.
Forgot to mention i´m using NGK 9s at .030 gap (factory gap)
Spark plugs are Definately too cold. You're not getting efficient spark. Go back to 7s to get a more efficient burn. Hell, I can barely utilize NGK 8s on full circuit events at full tilt. 9s is just WAY too cold.
The exhaust manifolds are fine, and are irrelevant until we know what turbocharger is even used.
Spark plugs are Definately too cold. You're not getting efficient spark. Go back to 7s to get a more efficient burn. Hell, I can barely utilize NGK 8s on full circuit events at full tilt. 9s is just WAY too cold.
The exhaust manifolds are fine, and are irrelevant until we know what turbocharger is even used.
First was tuned on 6s with same results. What you think about timing? 16 base and 25 at wot.
Spark plugs are Definately too cold. You're not getting efficient spark. Go back to 7s to get a more efficient burn. Hell, I can barely utilize NGK 8s on full circuit events at full tilt. 9s is just WAY too cold.
The exhaust manifolds are fine, and are irrelevant until we know what turbocharger is even used.
Both of these points. What's the turbo? If it's super small it's possible that it's choking out of it's efficiency range at the top end.
First was tuned on 6s with same results. What you think about timing? 16 base and 25 at wot.
Going to 9s is not helping your situation. Once this is solved, you'll have other problems. This is actually rather compounded.
I'll move this over to the Engine Management forum for a bit better help. Might need a good retune from another source than what you have. He should have known better than to use 9s.
First was tuned on 6s with same results. What you think about timing? 16 base and 25 at wot.
Depends on what the plugs say. Put a fresh set of NGK bkr7e plugs in with the coating sanded off the ground strap and pull the plugs after a wot pull, shutting the engine off at redline and post pics. Try to minimize idle and cruising time on the fresh plugs, but make sure you do a couple pulls to get the plugs hot so you can get an accurate read on the plugs. 9s are way way too cold for your setup.
Depends on what the plugs say. Put a fresh set of NGK bkr7e plugs in with the coating sanded off the ground strap and pull the plugs after a wot pull, shutting the engine off at redline and post pics. Try to minimize idle and cruising time on the fresh plugs, but make sure you do a couple pulls to get the plugs hot so you can get an accurate read on the plugs. 9s are way way too cold for your setup.
That pic is from a wot pull shutting the engine off at redline with 9s. Want to do the same with 7s?
That pic is from a wot pull shutting the engine off at redline with 9s. Want to do the same with 7s?
That looks like a old plug in the pic, if that's a new plug you have an oil consumption problem. It needs to be a fresh set of plugs with the coating sanded off the ground strap so you can see the color change.
Re: Street tune completed Z6/Vitara -results in slow acceleration/top end
If you're not cutting out at low rpm, I wouldn't suspect plugs are too cold.
I wish I could say I had more exp tuning D series but 25deg at wot at 0mbar isn't that much timing. I think you need more timing on the top end. Please post your spark maps. Also want to see how much timing you are dropping as you go through boost.
What's your comp ratio?
Don't run so rich in boost unless you are having heat issues. Latent fuel in the chamber will provoke detonation. On higher comp turbo builds I have had luck in the 12's. Flame travel is a great subject to delve into if you are getting serious.
Using an audio recorder and audacity or an audio program to analyse the knock signal in conjunction with your knock sensing unit would be advised.
Re: Street tune completed Z6/Vitara -results in slow acceleration/top end
Originally Posted by theYBLEGAL
If you're not cutting out at low rpm, I wouldn't suspect plugs are too cold.
I wish I could say I had more exp tuning D series but 25deg at wot at 0mbar isn't that much timing. I think you need more timing on the top end. Please post your spark maps. Also want to see how much timing you are dropping as you go through boost.
What's your comp ratio?
Don't run so rich in boost unless you are having heat issues. Latent fuel in the chamber will provoke detonation. On higher comp turbo builds I have had luck in the 12's. Flame travel is a great subject to delve into if you are getting serious.
Using an audio recorder and audacity or an audio program to analyse the knock signal in conjunction with your knock sensing unit would be advised.
At wot at 0mbar i use 30 degrees and 25-26 at 8psi at 6-7k.
Re: Street tune completed Z6/Vitara -results in slow acceleration/top end
Originally Posted by theYBLEGAL
Your timing goes down, then up, then down. Try to maintain fairly linear line, unless you are on the Dyno and can get instant torque feedback
Right now i´m on the job at the office and i make that quick map here to show how my map are. Basically my map looks like this one but smoother droping from 29 to 25 degrees.
Re: Street tune completed Z6/Vitara -results in slow acceleration/top end
All I can say is, if you don't have detonation, and your butt Dyno says there's an obvious dip in power, try reducing the amount of retard you are introducing. Raise timing a little at a time, and back off the fuel a little bit. Go about 12.5:1afr. Check for detonation.
Street tune completed Z6/Vitara -results in slow acceleration/top end
Oks
