View Poll Results: Best cam combo
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Best cam combo poll
Oct 28, 2004 | 10:37 AM
#61
Here's what one can do with a bit of cam timing:
https://www.evolutionm.net/forums/at...chmentid=45864
The cams are an HKS 272 set. The graph in red is a -3/-3 setting. The blue line is a -4/-1.5 setting. These runs were done back-to-back. The 300whp mark on this dyno = 350whp on a Dynojet.
Notice how the longer overlap setting (red) makes the car come on boost quicker, while the lower overlap setting spools a little later, but is a little better on peak power. Now, with a bigger turbo that can hold boost in the upper rpm ranges, one could use the lower overlap setting and really optimize power, which would be beneficial for drag racing.
For auto-x, one could use the high overlap setting and even advance both cams an equal amount (like 2-3 degrees), which would bring in the boost even earlier, and generate a wide, flat power curve that's good for blasting out of the corners.
Mods on this car: Vishnu Std turbo-back 3", 10.5t turbo, Xede +Xede-flash, AMS lower IC pipe, 255 lph pump, HKS 272, Vishnu cam gears, Helix O2 housing, 650cc injectors. Car has stock IC and has a catalytic converter.
https://www.evolutionm.net/forums/at...chmentid=45864
The cams are an HKS 272 set. The graph in red is a -3/-3 setting. The blue line is a -4/-1.5 setting. These runs were done back-to-back. The 300whp mark on this dyno = 350whp on a Dynojet.
Notice how the longer overlap setting (red) makes the car come on boost quicker, while the lower overlap setting spools a little later, but is a little better on peak power. Now, with a bigger turbo that can hold boost in the upper rpm ranges, one could use the lower overlap setting and really optimize power, which would be beneficial for drag racing.
For auto-x, one could use the high overlap setting and even advance both cams an equal amount (like 2-3 degrees), which would bring in the boost even earlier, and generate a wide, flat power curve that's good for blasting out of the corners.
Mods on this car: Vishnu Std turbo-back 3", 10.5t turbo, Xede +Xede-flash, AMS lower IC pipe, 255 lph pump, HKS 272, Vishnu cam gears, Helix O2 housing, 650cc injectors. Car has stock IC and has a catalytic converter.
Last edited by Ted B; Oct 28, 2004 at 10:43 AM.
Oct 28, 2004 | 11:07 AM
#63
Originally Posted by woobos
I have a set of tomei 280/ 11.5mm lift procams. Kind of nervous to try it out. It'll go into a BJCH Stage 5++ head next week.
260 with 11.5
270 with 11.5
280 with 11.8
Chris
Oct 28, 2004 | 12:13 PM
#64
after looking at the Chart. It seems to be a good amout of adjustablity with the camgears on the 272's. How hard is it to adjust cam gears. Is there anywhere I can read about it. Like I said earlier, I have never messed with cam gears and would like to read up on it. I guess I'll do a search. keep on posting this good information.
-Chad-
-Chad-
Oct 28, 2004 | 12:28 PM
#65
Originally Posted by 2k4EvoVIII
Hmm i was pretty sure that the Tomei come in the following configs
260 with 11.5
270 with 11.5
280 with 11.8
Chris
260 with 11.5
270 with 11.5
280 with 11.8
Chris
Oct 28, 2004 | 03:02 PM
#67
Originally Posted by boostfed
after looking at the Chart. It seems to be a good amout of adjustablity with the camgears on the 272's. How hard is it to adjust cam gears. Is there anywhere I can read about it. Like I said earlier, I have never messed with cam gears and would like to read up on it. I guess I'll do a search. keep on posting this good information.
-Chad-
-Chad-
Oct 28, 2004 | 03:06 PM
#68
Originally Posted by VTECH8TR
Heck it's Easy to adjust cam gears, just make sure you tighten all the bolts back up.
-Chad-
Oct 30, 2004 | 01:01 PM
#69
Oct 30, 2004 | 01:27 PM
#71
Originally Posted by MrBubbler
Oct 30, 2004 | 05:39 PM
#74
Originally Posted by Ted B
Here's what one can do with a bit of cam timing:
https://www.evolutionm.net/forums/at...chmentid=45864
The cams are an HKS 272 set. The graph in red is a -3/-3 setting. The blue line is a -4/-1.5 setting. These runs were done back-to-back. The 300whp mark on this dyno = 350whp on a Dynojet.
Notice how the longer overlap setting (red) makes the car come on boost quicker, while the lower overlap setting spools a little later, but is a little better on peak power. Now, with a bigger turbo that can hold boost in the upper rpm ranges, one could use the lower overlap setting and really optimize power, which would be beneficial for drag racing.
For auto-x, one could use the high overlap setting and even advance both cams an equal amount (like 2-3 degrees), which would bring in the boost even earlier, and generate a wide, flat power curve that's good for blasting out of the corners.
Mods on this car: Vishnu Std turbo-back 3", 10.5t turbo, Xede +Xede-flash, AMS lower IC pipe, 255 lph pump, HKS 272, Vishnu cam gears, Helix O2 housing, 650cc injectors. Car has stock IC and has a catalytic converter.
https://www.evolutionm.net/forums/at...chmentid=45864
The cams are an HKS 272 set. The graph in red is a -3/-3 setting. The blue line is a -4/-1.5 setting. These runs were done back-to-back. The 300whp mark on this dyno = 350whp on a Dynojet.
Notice how the longer overlap setting (red) makes the car come on boost quicker, while the lower overlap setting spools a little later, but is a little better on peak power. Now, with a bigger turbo that can hold boost in the upper rpm ranges, one could use the lower overlap setting and really optimize power, which would be beneficial for drag racing.
For auto-x, one could use the high overlap setting and even advance both cams an equal amount (like 2-3 degrees), which would bring in the boost even earlier, and generate a wide, flat power curve that's good for blasting out of the corners.
Mods on this car: Vishnu Std turbo-back 3", 10.5t turbo, Xede +Xede-flash, AMS lower IC pipe, 255 lph pump, HKS 272, Vishnu cam gears, Helix O2 housing, 650cc injectors. Car has stock IC and has a catalytic converter.
Oct 30, 2004 | 05:49 PM
#75
At the same setting, the 264/272 combo should give very comparable results to the 272 set, with spool up ocurring about 100rpm later and a peak power curve that tapers just very slightly sooner.