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Old 10-09-16, 08:43PM   #1
turbo louie
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Default Steel head an E85

What is the highest amount of boost a Pontiac can run on E85 w/intercooler?
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Old 10-10-16, 12:27PM   #2
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Boost it till the bolts break then back off
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Old 10-10-16, 01:51PM   #3
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haha! easy for you to say!
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Old 10-10-16, 02:04PM   #4
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That's not an easy he said she said answer. So many variables. Dynamic compression, actual mix of E85 (some times the E85 can be diluted), jetting or efi tune, port flow, all hot spots eliminated in the piston and chamber, etc. Good E85 and the intercooler should be super safe at 10 psi even with 9.5-1 compression. Then you have to raise your psi slowly watching your plugs and listening for any onset detonation. I think you should be able to reach 15 Psi as long as you are watching/listening and tuning well. Just make absolute sure you're not leaning out on the top rpm at all. Very important to have a even overkill on the fuel pump system. Run a big pump and bypass back to tank. Just some thoughts Charlie. I didn't mention cam because that would tie into the dynamic compression argument. Your rear gearing will also have an effect on how fast or slow the engine rpms thru any danger zones. One other detail is the bore size. The smaller bore size (350 size compared to a 400/455 sized bore) makes a difference too. The smaller bore is more detonation resistant.

Mark
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Old 10-10-16, 10:32PM   #5
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Thank you Mark. I guess what I really want to know is how would iron heads compare to a set of aluminum heads with a set tune. Like say you were all tuned with the aluminum and you knew that it was safe . Then you took them off and replaced them with a set of iron heads with the same cc combustion chambers , valves etc . Would it be just as safe?
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Old 10-10-16, 11:27PM   #6
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You can take an aluminum head combo with X compression, then drop a cast iron head with identical numbers (chamber CC's etc) and identical dynamic compression, the iron heads will act as if you've added about one full point of compression. The cooling affect of the aluminum head wicks the heat away and cools the combustion event faster, the iron retains the heat better acting like a higher compression.
In short, if you have an effective 9-1 compression with the aluminum head, all factors the same, the iron will act like a 10-1 compression. If you can hold a safe combustion event in the iron head, you have the advantage of the stronger more stable head material. The cast will not soften at the exhaust ports or lift at the deck. That's why I wish someone would make an iron copy of at least a good E-Head or one of the other aftermarket heads, just for boost.

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Old 10-10-16, 11:51PM   #7
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Do some back to back testing.
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old set up-3250 LBS 69 firebird T-88 turbo 455 .030 CAT H beam rods, stock crank, stock block( 2 bolt) performer intake, 850 carb 6X-6 heads 114 cc ( unported) TH 400 and 3.73 gears = 9.76 @ 141 with a 163 short time = 725 RWHP and 878 HP @ the crank

new set up - same but with home ported heads and Gen 7 DFI, my custom SS headers
Jeff Palazzo

Www.pontiaction.net
Www.mayhemturbo.com
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Old 10-10-16, 11:55PM   #8
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It will act like it's 1'pount higher in compression for octane tolerance, it most likely will not act like it as far as throttle repose of anything like that. The benefits are pretty clear to me though , you don't see me switching to aluminum heads. ��
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old set up-3250 LBS 69 firebird T-88 turbo 455 .030 CAT H beam rods, stock crank, stock block( 2 bolt) performer intake, 850 carb 6X-6 heads 114 cc ( unported) TH 400 and 3.73 gears = 9.76 @ 141 with a 163 short time = 725 RWHP and 878 HP @ the crank

new set up - same but with home ported heads and Gen 7 DFI, my custom SS headers
Jeff Palazzo

Www.pontiaction.net
Www.mayhemturbo.com
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Old 10-11-16, 08:52AM   #9
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Thanks Mark. It sounds like its the same as N/A .So all I have to do is treat it the same way and work around those differences with a turbo as would N/A...
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Old 10-11-16, 08:52AM   #10
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What's you comp ratio Jeff?
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Old 10-11-16, 08:55AM   #11
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I have a set of #16 castings . How would I get the comp down with a 430ci to 8.5 to1?
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Old 10-11-16, 11:51AM   #12
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It's around 8.2 to 1
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old set up-3250 LBS 69 firebird T-88 turbo 455 .030 CAT H beam rods, stock crank, stock block( 2 bolt) performer intake, 850 carb 6X-6 heads 114 cc ( unported) TH 400 and 3.73 gears = 9.76 @ 141 with a 163 short time = 725 RWHP and 878 HP @ the crank

new set up - same but with home ported heads and Gen 7 DFI, my custom SS headers
Jeff Palazzo

Www.pontiaction.net
Www.mayhemturbo.com
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Old 10-11-16, 11:54AM   #13
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A , big cc heads, big dish or drop it in the hole would be the only ways. Think Cometic gaskets take very little compression away that's realy for if your close but not close enough.
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old set up-3250 LBS 69 firebird T-88 turbo 455 .030 CAT H beam rods, stock crank, stock block( 2 bolt) performer intake, 850 carb 6X-6 heads 114 cc ( unported) TH 400 and 3.73 gears = 9.76 @ 141 with a 163 short time = 725 RWHP and 878 HP @ the crank

new set up - same but with home ported heads and Gen 7 DFI, my custom SS headers
Jeff Palazzo

Www.pontiaction.net
Www.mayhemturbo.com
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Old 10-11-16, 02:18PM   #14
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What are the castings numbers that have the big cc>s Jeff?
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Old 10-11-16, 02:52PM   #15
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I think it's 6x-6 but I never can remember the - number so double check on Wallace racungs site.

I've got too many numbers in my head all the time to keep track.
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old set up-3250 LBS 69 firebird T-88 turbo 455 .030 CAT H beam rods, stock crank, stock block( 2 bolt) performer intake, 850 carb 6X-6 heads 114 cc ( unported) TH 400 and 3.73 gears = 9.76 @ 141 with a 163 short time = 725 RWHP and 878 HP @ the crank

new set up - same but with home ported heads and Gen 7 DFI, my custom SS headers
Jeff Palazzo

Www.pontiaction.net
Www.mayhemturbo.com
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