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Turbo Intercooled e85 Timing

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Old Sep 14, 2017 | 01:25 PM
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Default Turbo Intercooled e85 Timing
Looking to see what other are running for timing at around 25 lbs of boost. Engine is a 5.3 at about 8.8 on compression and has a good air to water intercooler where iats never get over 70 degrees after 1/4 pass and it's running on e85. Has an S475 w/ t6 flange and we're maxed out at 24-25 lbs of boost and looking to squeeze some more power out of it...currently sitting at 19 degrees at 24 lbs of boost. Just looking for suggestions
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Old Sep 14, 2017 | 01:41 PM
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Did it pick up power going to 19*? Where did you start out on timing at 25psi?
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Old Sep 14, 2017 | 03:07 PM
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Originally Posted by svslow
Did it pick up power going to 19*? Where did you start out on timing at 25psi?
x2, if it keeps picking up 20+whp a degree then leave it in there, if it doesn't take it out.

S475 should have more life past 25PSI on a 5.3L, turn it up if you want more power.

Also what's your current A/F?
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Old Sep 14, 2017 | 03:24 PM
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I run 19* also at 24psi and 11.6 AFR with E85.
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Old Sep 14, 2017 | 03:25 PM
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19* is pretty much where its always been...never had the car on a dyno only track. This is straight race car no street driving. The way it sits its been 8.83 @ 152 in a 3100lb car @ 23.9 lbs of boost. That's with the waste gate pinned shut. Gonna try and pressure test the system and make sure it has no boost leaks. Car does have 4" piping from the turbo to the intercooler where the rear seat would be then to throttle body. Its blowing a 7.5 AFR at 24lbs...car runs on Holley Dominator also
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Old Sep 14, 2017 | 03:49 PM
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that afr is costing you power but id drop timing a little first then add it back with a leaner afr.

is that on a gas scale wideband. ?
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Old Sep 14, 2017 | 04:00 PM
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no e85 scale...its about 11.4 on gas scale
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Old Sep 14, 2017 | 04:10 PM
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Sounds like the turbo is done if you don't have any leaks. I always tune off the plugs and iirc at 24psi it could maybe take another degree or two but not much more.
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Old Sep 14, 2017 | 10:01 PM
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I've seen that term from time to time, "...waste gate pinned shut...". How does one do that?

Originally Posted by fastmach01
19* is pretty much where its always been...never had the car on a dyno only track. This is straight race car no street driving. The way it sits its been 8.83 @ 152 in a 3100lb car @ 23.9 lbs of boost. That's with the waste gate pinned shut. Gonna try and pressure test the system and make sure it has no boost leaks. Car does have 4" piping from the turbo to the intercooler where the rear seat would be then to throttle body. Its blowing a 7.5 AFR at 24lbs...car runs on Holley Dominator also
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Old Sep 15, 2017 | 06:25 AM
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Originally Posted by mightyquickz28
I've seen that term from time to time, "...waste gate pinned shut...". How does one do that?
CO2 dome control.
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Old Sep 15, 2017 | 11:46 AM
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Originally Posted by mightyquickz28
I've seen that term from time to time, "...waste gate pinned shut...". How does one do that?
While you can use CO2 or washers instead of a spring, I literally deleted the wastegate and used a blockoff plate:

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Old Sep 15, 2017 | 12:27 PM
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Damn! That'll do it! Thanks for the tip.


Originally Posted by SLOW SEDAN
While you can use CO2 or washers instead of a spring, I literally deleted the wastegate and used a blockoff plate:

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Old Sep 15, 2017 | 12:28 PM
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Plugs


CR and chamber play a huge roll in what timing it will want
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Old Sep 17, 2017 | 04:41 PM
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Do you have a 96mm turbine?
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