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Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#1
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Turbo timing curve
Curious what the turbo guys are running for timing under boost. Im running a 440” (4.185” bore x 4” stroke) with Edelbrock old style chamber heads. 10-1 compression with Butler spec’d solid roller. Blow thru on E85. What kind of initial timing and timing under boost is everyone running?
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#2
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505cid, 10.5:1 DCI RAV Heads, C16 fuel.
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#3
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9:1 - Initial 6 degrees @ 22 psi 23 degrees . 30 psi 18 degrees . 35 psi 13 degrees. With the new Edelbrock head. The older design head was different you can use more timing..
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My Half AN Injun..... |
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#4
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What fuel are you running Charlie? Did you mean 36 initial? That where I’m at but I’m pulling more timing right now to be safe. I’m at 18* at 18 psi and down to 14* at 25 psi. Plugs looks decent but I think I can add some timing.
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#5
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I run 20 degrees under full boost at 17 psi currently.
I’m at 34 cruise and I get 17 mpg. W 160 lb hr injectors.
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Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
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#6
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What your combo? What fuel are you running?
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#7
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What plugs are you guys running? I’m using NGK R5671A-10.
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#8
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Quote:
If you ask me you're timing settings are really conservative with the old style E head. With the older version head i was at 23 degrees @35 psi . But dont listen to me , work up into it by reading your plugs. Im sure you already know this but i just have to say it.lol At 25 psi i was at 24-25 degree ( old head )..
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My Half AN Injun..... |
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#9
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I use 8 heat range plug. I have used #7's in the past .. Only on E85 fuel ...
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My Half AN Injun..... |
The Following User Says Thank You to charlie66 For This Useful Post: | ||
#10
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Here's one of my center plugs also another picture of it with the threads cut off so you can see the ring . it's just under an eighth inch in width ring around the base.
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My Half AN Injun..... |
The Following User Says Thank You to charlie66 For This Useful Post: | ||
#11
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Locked at 32 with the btm pulling back to 22 at 15psi. 8.7-1 compression with 93 pump gas. I also add meth injection starting at 8psi.
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