Best AFR for people using C16?
What's the best AFR for people who use VP C16. This question is directed to people making big power.
Thanks. |
I see that Erniet's car was tuned at 12.0 AFR. Here is the link:https://www.rx7club.com/showpost.php...1&postcount=64
Is this about the best AFR when using C16 and wanting big hp? |
That's up to your tuner!
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leaner is meaner if you want big power ;)
But as Crispeed said, its up to your tuner('s balls, hehehe) Howard Coleman will be tuning up to 13.5:1 or so on pump gas...he wants big power and lower duty cycles. |
Originally Posted by crispeed
That's up to your tuner!
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Originally Posted by LUPE
I'm just curious to see what other people tune to (Their limits for big power). How about yours?
I don't think chrispeed is running gas. |
Originally Posted by OMGWTFDRIFTGUY
I don't think chrispeed is running gas.
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Don't worry about it. Thats your tuners job! :) Im sure Steve is plenty capable. He's made big power with his car. Its not his first rodeo.....
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Originally Posted by ErnieT
Don't worry about it. Thats your tuners job! :) Im sure Steve is plenty capable. He's made big power with his car. Its not his first rodeo.....
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Originally Posted by LUPE
I'm just curious to see what other people tune to (Their limits for big power). How about yours?
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Originally Posted by crispeed
Every application is different and there are no set standards in doing so. What might work with one setup is not going to work with another. That's why conservative tuning would come into play most of the times. Honestly if your application requires you to to be on the edge to make decent power then there are bottle necks left in there somewhere.
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I only gained about 10 horsepower going from 11.5 to 12.0 A/F. So I sacrificed the 10hp for the safety margin.
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Steve Kan emailed me and let me know he wants to tune my car at 11.6
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Originally Posted by LUPE
Steve Kan emailed me and let me know he wants to tune my car at 11.6
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Are you still doing the auto conversion?
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Originally Posted by crispeed
Are you still doing the auto conversion?
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Originally Posted by III Gen X
WHat's changed under the hood since the last time he tuned you? What are your a/fs @ 530whp? You got new porting or fuel delivery or ignition or something? You decided not to change turbo, right?
More injector, 24-29 psi wastegate spring, better boost controller, race plugs, tial 50mm bov and my exhaust is now open from the downpipe. Might be some other things besides that but I can't remember. We stopped last time because my wastegate spring was too small. |
Originally Posted by LUPE
Yeah, I'm going to do a C4.
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Originally Posted by crispeed
Before you tune?
I won't be doing the C4 until spring. I still need to buy the converter but not sure which one to get. Thinking 6500??? |
0 to 15psi - 12.0
15 to 22 - 11.5 22 - 30 - 11.0 over 30 - 10.5 That's basically how I have my A/F table set in the Tec 3. Anthony |
Anthony your leaving alot of power on the table with afr's in the 10.5 range with C16
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On pure C16 12.0 A/F's wouldn't scare me.... at 35 psi. ;)
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Originally Posted by Jim Swantko
On pure C16 12.0 A/F's wouldn't scare me.... at 35 psi. ;)
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Originally Posted by enzo250
Anthony your leaving alot of power on the table with afr's in the 10.5 range with C16
It's just that I see some rotaries make a million passes on the dyno on high boost and never blow up because they are running a lot richer on top. Anthony |
Originally Posted by AnthonyNYC
What would you say was "safe" or what would you recommend for those boost levels I noted.
It's just that I see some rotaries make a million passes on the dyno on high boost and never blow up because they are running a lot richer on top. Anthony Most of the high horsepower rotaries that I've tuned is not worth the extra 20 whp for tuning them lean in my opinion, especialy if it's a street application and if power is going to be sustained for any length of time. Power cannot be detremined only by A/F measurement. You got to have a right balance of A/F, Ign. timing and Egt's just to name a few. Just for example let's say you tune to 12.0 A/F on the dyno and made good power with safe egt's. Now you go out on the street and hold that sucker in high gear for any length of time and that same 12.0 A/f is resulting in turbine melting, apex seal growing, warping, breaking and spring flattenning egt's what will you do then? Sacrifice reliabilty for a little power. |
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