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Old 01-29-2011, 07:43 PM   #1
bluebottle
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Default high compression & high boost

high compression such as 12-13:1 and high boost 30 psi.

do we see this combination?


will high compression and high boost make more power?
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Old 01-29-2011, 07:52 PM   #2
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Default Re: high compression & high boost

x2
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Old 01-29-2011, 07:54 PM   #3
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Default Re: high compression & high boost

yes will make more power if you keep from detonating it apart
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Old 01-29-2011, 09:28 PM   #4
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Default Re: high compression & high boost

Methonal yes.
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Old 01-29-2011, 11:36 PM   #5
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Default Re: high compression & high boost

The tuning window will be VERY NARROW! Don't slip up
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Old 01-29-2011, 11:39 PM   #6
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Default Re: high compression & high boost

You would also need a very large turbo to run 30lbs at 12.5 to1 comp.

I have a GT500 with compound boost(stock blower and twin billet 64's) and run 8.5 to1 and 40lbs and am building a new motor with 9.5 to 1 and hope to pick 100-150rwhp at the same boost level.
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Old 01-30-2011, 12:37 AM   #7
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Default Re: high compression & high boost

VP Import
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Old 01-30-2011, 12:43 AM   #8
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Default Re: high compression & high boost

My friends old Big Cheif 540 had 11-1 with up to 43psi of boost on Alcohol..But is had a 14-71 kobelco on it..
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Old 01-30-2011, 07:50 AM   #9
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Default Re: high compression & high boost

[QUOTE=thebull;5560527]You would also need a very large turbo to run 30lbs at 12.5 to1 comp.

I have a GT500 with compound boost(stock blower and twin billet 64's) and run 8.5 to1 and 40lbs and am building a new motor with 9.5 to 1 and hope to pick 100-150rwhp at the same boost level. It's on E85.....The fuel is incredible....I don't know why they won't allow it in X275????? Cheaper for the racer and a lot less breakage!!!
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Old 01-30-2011, 08:00 AM   #10
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Default Re: high compression & high boost

[QUOTE=thebull;5561467]
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Originally Posted by thebull View Post
It's on E85.....The fuel is incredible....I don't know why they won't allow it in X275????? Cheaper for the racer and a lot less breakage!!!
It really pisses me off that I will have to switch back to gas this year to run X275. I will miss my cheap racing fuel.
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Old 01-30-2011, 08:03 AM   #11
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Default Re: high compression & high boost

I wish there was some solid data such as:

- dyno graps with low compression vs high compression

- drag race results low vs high comp engine


When the compression is raised, the piston turns the cranshaft faster.

There "is" or "should be" a point where more compression will trigger detonation whichever fuel we run.

It is hard to find that sweat spot.
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Old 01-30-2011, 09:22 AM   #12
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Default Re: high compression & high boost

Quote:
Originally Posted by bluebottle View Post
I wish there was some solid data such as:

- dyno graps with low compression vs high compression

- drag race results low vs high comp engine


When the compression is raised, the piston turns the cranshaft faster.

There "is" or "should be" a point where more compression will trigger detonation whichever fuel we run.

It is hard to find that sweat spot.
If you search on google, there are some back to back tests that were done with dyno sheets.
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Old 01-30-2011, 06:52 PM   #13
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Default Re: high compression & high boost

check out the diesel engines. HIGH compression and TONS of boost. its all in the fuel and tune for gas. also, without a long drawn out post, " just an example" if you were to run 8.5:1 engine with say.... 12lbs of boost and make 400rwhp. now, if you were to run a 10.0:1:1 engine and want to make the same rwhp you would be able to run less boost to get the same result. but you need to be more carful with the tune. like they say, the window for tuning is shorter. The 8.5:1 engine might be able to run on 89octane fuel, but the 10.0:1 would need to be on 93 octane.
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Old 01-31-2011, 01:58 AM   #14
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Default Re: high compression & high boost

Quote:
Originally Posted by 95mmRenegade View Post
If you search on google, there are some back to back tests that were done with dyno sheets.
The only tests I have ever seen are low compression ratio vs high compression ratio with constant boost. Surprise surprise the high compression engine makes more power....

The back to back tests with dyno sheets I would like to see are low compression ratio vs high compression ratio while maintaining the same BMEP, i.e. increase boost pressure with lower compression to create the same BMEP as the high compression engine.

If you search on google you will also find some interesting information on the benefits of low compression/high boost:
http://www.modularfords.com/forums/s...boost-pressure
http://forum.e46fanatics.com/showthread.php?t=726637

Cheers,
Glen

Last edited by Bear77; 01-31-2011 at 01:59 AM.
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Old 01-31-2011, 11:14 AM   #15
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Default Re: high compression & high boost

Quote:
Originally Posted by Bear77 View Post
The back to back tests with dyno sheets I would like to see are low compression ratio vs high compression ratio while maintaining the same BMEP, i.e. increase boost pressure with lower compression to create the same BMEP as the high compression engine.
Well said. That's what it's all about. We just need to find some one with the coin$ to afford us this information. One method could require less octane or greater efficiency at the same BMEP.

There are also a lot of factors to consider with each cylinder head design and such.
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