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Thread: Turbo spool tuning

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Posts: 11-20 of 31
2012-05-22 15:57:24
#11
Like Xedox said in post #8, you can run really retarded ignition and basically get anti-lag behavior. The reason I don't do this has always been my emphasis on getting power to the ground rather than focus on any sort of intake pressure number. I basically don't put boost pressure up on a pedestal like others tend to. I don't focus on making boost pressure, at the expense of other things. It would take back-to-back comparisons on the dyno to show if one way is better than another, but I focus on maximizing the efficiency and power of the combustion event while basically ignoring what it might do to spooling the turbo.

I spend my efforts trying to get the most out of the air and fuel I have in the combustion chamber at that very moment, without regard to how it may or may not hurt combustion events later. For me, that makes for ultimately a smooth and predictable and more well rounded tune. A spool preferred tune may help in a few weird cases, but for me I like to see the most out of my current combustion events. I wouldn't be surprised if that smoother and more efficient method turned out to be actually the most productive when measured on a dyno or in race conditions.
Last edited by BenFenner on 2012-05-22 at 16-01-35.
2012-05-22 16:03:02
#12
Originally Posted by BenFenner
Like Xedox said in post #8, you can run really retarded ignition and basically get anti-lag behavior. The reason I don't do this has always been my emphasis on getting power to the ground rather than focus on any sort of intake pressure number. I basically don't put boost pressure up on a pedestal like others tend to. I don't focus on making boost pressure, at the expense of other things. It would take back-to-back comparisons on the dyno to show if one way is better than another, but I focus on maximizing the efficiency and power of the combustion event while basically ignoring what it might do to spooling the turbo.


Retarding timing to help build bOOst... slows RPM rate of change which hurts building boost.. .yO Net result is no help.

Hence a good reasonable tune is about as good as it gets. Tune for power and the psi will come.

If you want rate of change for PSI... You can check out my car at convention. LOL
2012-05-22 16:06:04
#13
This thread is dumb. You are asking if there is a specific way to tune your turbocharged car to make it more peppier during spool up time (turbo lag) correct? How did anti-lag even come into this equation??
2012-05-22 16:07:08
#14
You put it well Nate. I focus on rate of change of RPM, not boost. Which is exactly why it blows my mind that some folks don't like light flywheels on boosted cars "because boost doesn't build as fast".

You're telling me that the car accelerates too quickly to build as much boost as you did before, and that's somehow a problem?
You realize you just said the car accelerates faster, right? You caught that part coming out of your own mouth, yes?
2012-05-22 16:09:02
#15
Originally Posted by Scrildo
How did anti-lag even come into this equation??
Because it is the same concept. What can you do with fuel and air to get more energy to the turbocharger?
2012-05-22 16:09:14
#16
Originally Posted by BenFenner
You put it well Nate. I focus on rate of change of RPM, not boost. Which is exactly why it blows my mind that some folks don't like light flywheels on boosted cars "because boost doesn't build as fast".


FWIW on ALL of the SR motors I built... I only used a 4CW crank for this reason. Always had super light rotating assemblies.
2012-05-22 16:19:31
#17
Originally Posted by BenFenner
Because it is the same concept. What can you do with fuel and air to get more energy to the turbocharger?


Hmm I'm pretty sure anti-lag cant be used while DRIVING in vacum in the lower rpm range pre-boost to build boost dude.
2012-05-22 16:20:23
#18
Sure it can.
2012-05-22 16:22:57
#19
Originally Posted by wnwright
Tune for power and the psi will come.

You've build many sr's. Tell me what this means in afr and timing numbers between 2000 and 3000 RPM I'm too far from the convention
2012-05-22 16:23:46
#20
I have a calum basic with SAFC piggyback.
The tune I have on the Ecu works good but i had a lot of lag running GTiR turbo and BC2 cams,
so what I did was richen the mixture to 13.1-13.5 from 1500-3000 rpms above 14% Throttle and it has made a lot of difference. With those adjustments the car feels much better daily driving around town. It feels a little better if I richin it a little more but I want to keep mpg low.
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