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Old 02-16-2015, 08:46 PM
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[email protected] A1668 Billets Put To The Test!

Sean at SRM said he had some time before the full turbo kit is done so we said what the heck put the 'lil billets" on. Right out of the gate torque shot to the low 900s at the tires and then they got to work dialing it in. Awesome project and great tuning boys. Very impressed at how they did and with no IC's yet! Great power under the curve and I am sure a blast to drive! Can't wait to hear about it after a few miles.

This was on Sean's 3.8, 10:1 compression car on E85. My A1668/K1668 Billets at about 25psi. After the coolers I am sure she will do even better.


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Last edited by [email protected]; 02-16-2015 at 09:35 PM.
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Old 02-17-2015, 12:37 AM
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Insane power! Is this a result of the stand-alone setup? I know my boost increases as I get closer to redline, but not this much!
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Old 02-17-2015, 02:28 AM
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Originally Posted by TabooPc View Post
Insane power! Is this a result of the stand-alone setup? I know my boost increases as I get closer to redline, but not this much!
The boost profile although varies by gear averages 15-25 between 3000-7000rpm which is why you see the climb towards redline to prevent blowing the tires off down low (car is rwd). The car is running the proefi 112 system, which allowed us to shape the boost by gear and rpm to control tq onset.
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Old 02-17-2015, 06:00 AM
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holy cow. nice job guys.
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Old 02-17-2015, 10:26 AM
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E-85 and ProEFI
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Old 02-17-2015, 11:14 AM
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E-85 and ProEFI

Nice job,,
But I do think those 2 mods and 25 PSI would have most modified turbos excel?
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Old 02-17-2015, 01:06 PM
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Absolutely John. We are simply sharing how well our K16 billets did and the small turbine was not an issue here. The bigger you go the more power and more lag. Nature of the beast. This car feels like a blown V8 right now.
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Old 02-17-2015, 06:25 PM
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Yes its all a compromise some where,,more top end power at the expense of lag..
But sometimes that hard hit with a lot of power down low might make the car harder to drive off the line and put a lot of stress on the chassis components and clutch..
How is the 68 wheel compared to the 18 wheel ,,,
And you think there would be a lot to gain with it in a K24 set-up?
Thanks,,Inquiring minds would like to know..
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Old 02-17-2015, 08:03 PM
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Originally Posted by johnspeed View Post
Yes its all a compromise some where,,more top end power at the expense of lag..
But sometimes that hard hit with a lot of power down low might make the car harder to drive off the line and put a lot of stress on the chassis components and clutch..
How is the 68 wheel compared to the 18 wheel ,,,
And you think there would be a lot to gain with it in a K24 set-up?
Thanks,,Inquiring minds would like to know..
Not all billet K16's are created equal. These use an HTA68 compressor which is rated at 47lbs/min (10-20% more than some other options). The machining process to create these compressors is 4 X as long as a typical flank milled comp wheel. The HTA design is constantly evolving whereas the typical 24/18g wheels are based on 15+ year old designs, aero has improved a lot since.

Last edited by itguy; 02-17-2015 at 08:18 PM.
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Old 02-17-2015, 08:04 PM
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The HTA71 wheel used on the k24 hybrid would put this car into the 900's
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Old 02-17-2015, 08:15 PM
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Not all billet K16's are created equal. These use an HTA68 compressor which is rated at 47lbs/min (10-20% more than some other options). The machining process to create these compressors is 4 X as long as a typical flank milled comp wheel. The HTA design is constantly evolving whereas the typical 20/24g wheels are based on 15+ year old designs, aero has improved a lot since.
Thanks for reply but I am not clear on your answers to my questions Above?
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Old 02-17-2015, 08:21 PM
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Not all billet K16's are created equal. These use an HTA68 compressor which is rated at 47lbs/min (10-20% more than some other options). The machining process to create these compressors is 4 X as long as a typical flank milled comp wheel. The HTA design is constantly evolving whereas the typical 20/24g wheels are based on 15+ year old designs, aero has improved a lot since.
right but the others are not Gs... they are billet Blouch design. I do not know anyone is actually using the 20gs anymore, or 18gs for that matter... or 16gs...
that HTA wheel is good... nothing bad to say about it- as a matter of fact I have hta 3582s on my car and it ran 9.656 sec 1/4 mile and Im not done yet...
The other, which I primarily use is a Blouch billet compressor wheel. Not too shabby either if you do a search on the 60 to 130s.... BTW, Sambo stuff is great
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Old 02-17-2015, 08:25 PM
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So are you guys saying the 68 wheel would also work better in a K24 over a 18billet or 18g wheel?
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Old 02-17-2015, 08:38 PM
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So are you guys saying the 68 wheel would also work better in a K24 over a 18billet or 18g wheel?
Less back pressure, would spool slightly slower and make slightly more on top.
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Old 02-17-2015, 08:46 PM
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John, It can become an argument lol. But it has been designed to be better in every way yes. However there are some fast cars running 18G and other billet wheels. I remember we spoke about your. I would not go from one K24 hybrid to another. The next smart step for you is to go with a full spec turbo like a A307X.

To answer in short, Yes 47lbs/min vs about 40 I think on the 18G. 20G is 44.

Markski, Cheers bud. Almost ready to tune the red car.
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