ZR-1 Net Registry Forums - View Single Post - 430-435 CHP now.....What can I do to get 500-510 CHP?

LGAFF · 06-20-2016

alot of factors in individual results; cam timing, etc. My 90 made 441 rwhp @ 7100 373 ftlbs @5300 with siamesed runners and ported heads, but the torque seemed alittle low and they were large ports. Given, the car was never professionally tuned....cams are smaller, now I have ported 93 runners on the car ported to 36MM+, would be curious to see the difference; last year ran 12.1@121MPH with an 800RPM launch and a tach that was way off...

My large plenum test resulted in a 20hp loss.

large plenum:
http://www.zr1.net/forum/showthread....hlight=siamese

06-20-2016	#35
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: 430-435 CHP now.....What can I do to get 500-510 CHP? alot of factors in individual results; cam timing, etc. My 90 made 441 rwhp @ 7100 373 ftlbs @5300 with siamesed runners and ported heads, but the torque seemed alittle low and they were large ports. Given, the car was never professionally tuned....cams are smaller, now I have ported 93 runners on the car ported to 36MM+, would be curious to see the difference; last year ran 12.1@121MPH with an 800RPM launch and a tach that was way off... My large plenum test resulted in a 20hp loss. large plenum: http://www.zr1.net/forum/showthread....hlight=siamese __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 06-20-2016 at 09:24 PM.