Nitrous Compression Ratio?

N/A01RS · 08-10-2002, 05:50 PM

Im starting my N/A buildup and am looking at purchasing the Cobb Stage 2 short block, but when I get to where I want to be with the engine (210-220whp) I want to add a 75-100hp shot of nitrous. I was told by a guy at work that If I plan on running nitrous I should stick with the stock compression ratio instead of the 11:1 pistons that come with cobbs kit. Is this true? What is the highest compression that you can run on 93 octane gas with stand alone engine management? Safely of course. Also, as far as increasing the bore and/or stroke on the EJ25 I read somewhere that the bore is already so wide that it can cause problems with fuel burn. What are the positives and negatives to altering the stroke. I know this is alot of questions, but id apreciate any help/advice.

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N/A01RS · 08-11-2002, 12:25 PM

Oh come on, I know theres some really smart people on here!

Section 8 · 08-13-2002, 02:08 AM

Ummmm.... ask the person building your engine???

If you spending that kind of money and they can't answer that question.

Hang up the freaking phone.

I could tell you to run 13:1 and go to the paint store and buy chemical Toluine and add large ammounts to your gas. Guess what, your engine builder will say.

"Step away from the crack pipe."

And you will do what they say anyway......

cheeRS,

Greg

08-10-2002, 05:50 PM	#1
N/A01RS Scooby Newbie Member#: 22478 Join Date: Aug 2002 Location: Kutztown, Pa Vehicle: 2002 WRX Sedan Platinum Silver	Nitrous Compression Ratio? Im starting my N/A buildup and am looking at purchasing the Cobb Stage 2 short block, but when I get to where I want to be with the engine (210-220whp) I want to add a 75-100hp shot of nitrous. I was told by a guy at work that If I plan on running nitrous I should stick with the stock compression ratio instead of the 11:1 pistons that come with cobbs kit. Is this true? What is the highest compression that you can run on 93 octane gas with stand alone engine management? Safely of course. Also, as far as increasing the bore and/or stroke on the EJ25 I read somewhere that the bore is already so wide that it can cause problems with fuel burn. What are the positives and negatives to altering the stroke. I know this is alot of questions, but id apreciate any help/advice. * Registered users of the site do not see these ads. Last edited by N/A01RS; 08-11-2002 at 12:23 PM.

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08-11-2002, 12:25 PM	#2
N/A01RS Scooby Newbie Member#: 22478 Join Date: Aug 2002 Location: Kutztown, Pa Vehicle: 2002 WRX Sedan Platinum Silver	Oh come on, I know theres some really smart people on here!

08-13-2002, 02:08 AM	#3
Section 8 Scooby Specialist Member#: 821 Join Date: Jan 2000 Chapter/Region: MWSOC Location: "Like a hyena you are..."	Ummmm.... ask the person building your engine??? If you spending that kind of money and they can't answer that question. Hang up the freaking phone. I could tell you to run 13:1 and go to the paint store and buy chemical Toluine and add large ammounts to your gas. Guess what, your engine builder will say. "Step away from the crack pipe." And you will do what they say anyway...... cheeRS, Greg