Compression Limits of Pump Gasoline

Turbocharging, Supercharging, Intercooling, etc.

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spiffyguido
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Compression Limits of Pump Gasoline

Postby spiffyguido » Mon Mar 27, 2006 11:24 pm

I'm putting together a forced induction system. I'm trying to calculate how much boost I can run and what compression ratio I need to start out with. I will be making use of an intercooler.

My question is, is there a chart that anyone knows of that shows the compression and heat tolerances of pump gasolines? I need a baseline figure to do some calculations from to see how hard I can push things without having to over-retard my ignition.

Any help would be much appreciated.

garygadget
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Postby garygadget » Sat Dec 08, 2007 11:18 am

What are you doing turbo or supercharger a few people i know have turbocharged a 2.2 4th on standard internals you can run low boost with no problems and very little or no ignition changes i will have to find out what boost they use but any higher and the internals will have to be uprated
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spiffyguido
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Postby spiffyguido » Sat Dec 08, 2007 7:39 pm

Thanks, Gadget.

Mostly I was curious what type of boost I could safely run on pump gas. I'm in the process of rebuilding an engine right now for boost, and the internals are getting upgraded. I want to be able to have it be a daily driver on pump gas (91 octane).

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Postby garygadget » Sun Dec 09, 2007 2:13 pm

Just checked and people run about 6-8 psi on standard internals over here but have put in a p28ecu, bigger injectors,uprated fuel pump
but we have as standard 95 octane and most garages also sell 97 octane but with a good quality octane booster 100 might be acheived
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Postby Prelude4Lyfe » Thu Feb 21, 2008 9:56 pm

6-8 PSI on stock internals. If you own a thrid gen you can push 220 WHP on stock internals.

Get a tune. Or you blow that crap up

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Postby CADster » Mon Apr 28, 2008 2:40 pm

i dont think you have a set 'limit' you can go by.

too many variables.

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Re: Compression Limits of Pump Gasoline

Postby rmotive » Fri Jun 05, 2009 12:44 pm

To be safer, get water/methanol injection. You can run the same amount of boost, but more safely since you will have less engine heat and knock/ping.

Turbo is definitely the way to go, the only problem is ensuring it's reliable. Make sure to get tuned, as it's hard to say how much boost is safe for your car since it depends on so many factors... the dyno will tell you.




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