Anyone have a good 93oct, 35R 10:1 compression tune they care to share?
Sep 11, 2012, 11:46 AM
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Anyone have a good 93oct, 35R 10:1 compression tune they care to share?
I'm exhausted from trying to troubleshoot my car's knock. I need to start fresh with someone else's help please. Can someone please share their tune with me who's running a 35R on a 10:1 motor with pump gas? I have my SD all setup, I'm rally just concerned with trying to use your timing/Fuel charts to see what happens with my car's knock. Thanks!
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Sep 11, 2012, 01:14 PM
#4
10-1/35r is not a big deal at all on pump gas. You just can't run a ton of boost, but that's due to using pump gas in general, not specifically related to having a bigger turbo on pump.
Volume of air and manifold pressure are two different things. Boost is only a measure of pressure, which is essentially air density. So, at a higher boost level, you may have higher air density, but that tells you nothing about how quickly the air is moving.
AKA, if using pump you can only run ~30#, whether it be a stock turbo or a 3586.
A "big" turbo creates a large column of moving air that is then necked down to whatever your port size is. A "small" turbo creates a smaller column of moving air that is also necked down. The difference is the air velocity at the neck will be higher for the large turbo then the small turbo, which is why you'll see a benefit from a larger turbo, at the same psi with the same setup.
Volume of air and manifold pressure are two different things. Boost is only a measure of pressure, which is essentially air density. So, at a higher boost level, you may have higher air density, but that tells you nothing about how quickly the air is moving.
AKA, if using pump you can only run ~30#, whether it be a stock turbo or a 3586.
A "big" turbo creates a large column of moving air that is then necked down to whatever your port size is. A "small" turbo creates a smaller column of moving air that is also necked down. The difference is the air velocity at the neck will be higher for the large turbo then the small turbo, which is why you'll see a benefit from a larger turbo, at the same psi with the same setup.
Last edited by Blue91lx; Sep 11, 2012 at 01:21 PM.
Sep 12, 2012, 06:21 AM
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Sep 13, 2012, 02:31 PM
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Honestly, we'd need to see a mod list and whatnot. A lot of the time if you have a few restrictive parts your car will want to knock due to increased back pressure. It could be due to something like that.
Once you free up those bottlenecks the car will take more timing and love it.
Also, have you ruled out phantom knock? Solid motor mounts, anything vibrating on the exhaust, etc?
Once you free up those bottlenecks the car will take more timing and love it.
Also, have you ruled out phantom knock? Solid motor mounts, anything vibrating on the exhaust, etc?
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