B20VTEC Dyno

[93H22ACX]

just wondering why didnt he go with high compression nitrous pistons?

Higher compression and nitrous makes a good combination....

looks good though.. .cant wait to see it in action

[jackdaripper]

just wondering why didnt he go with high compression nitrous pistons?

Higher compression and nitrous makes a good combination....

looks good though.. .cant wait to see it in action

Well you see with high compression pistons you are limited to how big of a shot you can use, however with the low compression the sky is the limit. The head has a good port job just at high rpms it falls off due to no compression to combust all that is coming in, now when the car is sprayed it will wake up and a "200 shot" would actualy probbly put 210-220 to the wheels extra. Also it won't be a 200 shot on the car, but it WILL dominate on the street.

[93H22ACX]

Well you see with high compression pistons you are limited to how big of a shot you can use, however with the low compression the sky is the limit. The head has a good port job just at high rpms it falls off due to no compression to combust all that is coming in, now when the car is sprayed it will wake up and a "200 shot" would actualy probbly put 210-220 to the wheels extra. Also it won't be a 200 shot on the car, but it WILL dominate on the street.

actually you're wrong there. With tuning, sky is the limit. Higher compression with the same 200 shot of nitrous makes more whp than a lower compression pistion with 200 shot of nitrous.

Same as higher compression and turbo, it allows faster spool and more power per psi...most of the time if its built right

[Vteckidd]

there are 2 schools of thought on this subject.

A long time ago people went with as low compression as possible for their FI motors. But, nowadays there is info to prove otherwise.

You can make the SAME WHEELHORSEPOWER with less boost if you run more compression. so at 8,5:1 compression youll need 35 psi to make 600whp. or at 10.1:1 you only need 25psi to make 600whp (assuming turbo setup is the same). which is more efficient? i would take the 10:1 motor.

Nitrous has a cooling effect. On a higher compression motor, you can run less of a Nitrous shot and make the same power. Or, cause of Nitrous cooling effects, you can run a 200shot on a 12:1 motor, AS LONG AS ITS TUNED RIGHT. timing and fuel are critical.

I knew a guy once that had this 11.7:1 motor, he sprayed a 125shot on his engine. it lasted and never blew up, he ran a 12.1

[93H22ACX]

there are 2 schools of thought on this subject.

A long time ago people went with as low compression as possible for their FI motors. But, nowadays there is info to prove otherwise.

You can make the SAME WHEELHORSEPOWER with less boost if you run more compression. so at 8,5:1 compression youll need 35 psi to make 600whp. or at 10.1:1 you only need 25psi to make 600whp (assuming turbo setup is the same). which is more efficient? i would take the 10:1 motor.

Nitrous has a cooling effect. On a higher compression motor, you can run less of a Nitrous shot and make the same power. Or, cause of Nitrous cooling effects, you can run a 200shot on a 12:1 motor, AS LONG AS ITS TUNED RIGHT. timing and fuel are critical.

I knew a guy once that had this 11.7:1 motor, he sprayed a 125shot on his engine. it lasted and never blew up, he ran a 12.1

well said LOL...

Example also...
GSR hatch, stock 10:1 running 100shot = 12.01@112MPH
H22 hatch, 11.8:1 running 70 shot= 12.1@115MPH