help with pistons - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

nas240man · 04-03-2003, 10:13 PM

I'm trying to decide what compression ratio to run in my motor, , i'll be using stock rods and i'm aiming for 300whp MAX, most likely just be running 7-10 lbs on a t3, 15 lbs will be the max. do you turbo buffs think 9:1 will be to high?

Red · 04-03-2003, 10:18 PM

I would leave mine at 8:5.1.... But thats me.

turbo240sx · 04-04-2003, 08:23 AM

are you upgrading the fuel systom, "injectors fuel pump" you can do it at 9:1 but you need good tunning on the fuel system. and watch the air fuel ratio's real close.

boosteds14 · 04-04-2003, 08:48 AM

I would actually go with a 8.5:1 ratio

this way here, in the near future if you ever want to upgrade, you have room to bump the boost knowing you have the correct CR. but that is if you have the right fuel set up to be doin that.

I would also go with JE Pistons. they are nice.

Email me if you want more info: [email protected]

*Jeff240sx* · 04-04-2003, 09:53 AM

Quote:

Originally posted by nas240man
I'm trying to decide what compression ratio to run in my motor, , i'll be using stock rods and i'm aiming for 300whp MAX, most likely just be running 7-10 lbs on a t3, 15 lbs will be the max. do you turbo buffs think 9:1 will be to high?

8.5:1 is the way to go. You'll need to run ~2psi more to make up for the power loss from the pistons, but it's all good. Also, a t3 is too small to make 300hp. It could, but you'll be compressing the air past most T3 trim's efficiency. Possibly look towards a t3/4 for the 15psi you want to run. A t3 for 10psi would be a very good choice, tho. We're (Boosted and I) are just trying to keep you from buying parts, running to their limit, and then buying the same parts again, later. Buy the pistons once, buy the turbo once, and everything else is cheap enough to upgrade over time (injectors, ecu, ect.)
-Jeff

04-03-2003, 10:13 PM	#1
nas240man Leaky Injector Join Date: Feb 2002 Posts: 69 Trader Rating: (0) Feedback Score: 0 reviews	help with pistons I'm trying to decide what compression ratio to run in my motor, , i'll be using stock rods and i'm aiming for 300whp MAX, most likely just be running 7-10 lbs on a t3, 15 lbs will be the max. do you turbo buffs think 9:1 will be to high?

04-03-2003, 10:18 PM	#2
Red Zilvia Addict Join Date: Feb 2002 Location: Vancouver, WA - Portland, OR Age: 44 Posts: 734 Trader Rating: (0) Feedback Score: 0 reviews	I would leave mine at 8:5.1.... But thats me. __________________ http://www.cardomain.com/memberpage/509537 http://www.imagestation.com/album/?id=4287415487 http://www.zilvia.net/f/showthread.php?t=21036

04-04-2003, 08:23 AM	#3
turbo240sx Zilvia Member Join Date: Oct 2002 Location: CT Posts: 166 Trader Rating: (0) Feedback Score: 0 reviews	are you upgrading the fuel systom, "injectors fuel pump" you can do it at 9:1 but you need good tunning on the fuel system. and watch the air fuel ratio's real close. __________________ 240sx s-13 TURBO weekend v-8 killer 90 Talon TSI WARNING.THIS CAR IS EQUIPPED WITH A TURBOCHARGER. DUE TO POSSIBLE BREATHING PROBLEMS UNDER HEAVY ACCELERATION, ALL FEMALES ARE ADVISED TO REMOVE ANY TIGHT FITTING OR RESTRICTIVE CLOTHING FOR SAFETY.

04-04-2003, 08:48 AM	#4
boosteds14 Zilvia.net Advertiser Join Date: Jan 2002 Location: CIPmotorsports Age: 43 Posts: 1,612 Trader Rating: (0) Feedback Score: 0 reviews	I would actually go with a 8.5:1 ratio this way here, in the near future if you ever want to upgrade, you have room to bump the boost knowing you have the correct CR. but that is if you have the right fuel set up to be doin that. I would also go with JE Pistons. they are nice. Email me if you want more info: [email protected] __________________ 240SXONE www.240SXMOTORING.com --- One Stop Shop for Your Nissan 240sx