Supercharge stock 454 mag?
10-08-2009, 07:03 PM
#11
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You already have a more static compression. I think it is 8.7:1 if a mag engine. Thats a nice bump over the 525sc which I believe was 7:1. You need a v-6 tbolt module with only 14* total advance. The v-8 have about 24 degrees which in order to make it idle right would put the all in timing too high.
I run the mechanical block mounted fuel pump but you can do what ever works for you.
I run the mechanical block mounted fuel pump but you can do what ever works for you.
10-09-2009, 01:50 PM
#14
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525SC has 7.5:1 CR and runs a 22* advance module with a total advance of 35*
454Mag has 8.75:1 CR and run a 24* advance module with total advance at 32*
The module curves are not very different. You could run the stock module as long as you can get the engine to idle with only 8* of initial timing. I would not run more than 32* total with the 8.75 CR. You will also need to run 93 octane fuel.
454Mag has 8.75:1 CR and run a 24* advance module with total advance at 32*
The module curves are not very different. You could run the stock module as long as you can get the engine to idle with only 8* of initial timing. I would not run more than 32* total with the 8.75 CR. You will also need to run 93 octane fuel.
10-09-2009, 07:00 PM
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10-09-2009, 11:18 PM
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Pay close attention to the effective compression ratio chart with regard to running 92 octane. Holley says 12:1 max for 92 octane. I would say more like 11.5:1 for a marine engine.
http://www.holley.com/data/TechServi...ech%20Info.pdf
10-10-2009, 09:36 AM
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One point worth mentioning on my setup is I get away with more because I have aluminum heads. More effective compression for sure. I have been at 12.7:1 for 2 yrs of hard running and now at 13.4:1. If you have iron heads follow the chart as the chart is based on iron heads.
10-10-2009, 10:21 AM
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Nice thread. Since we are talking about prochargers, is there many objections to a Vortec supercharger vs a procharger. They appear to have the same dynamics and concepts.
On a marine application it is almost a must to go intercooled, correct?
On a marine application it is almost a must to go intercooled, correct?
