hey guys, has anyone tried retarding the stock cams ? I'm looking for some low-end torque. Does anyone have any ideas to get GREAT bottom-end. I need tire shredding torque!

 

bump

 

PM NOIZE...he has done testing with this on a dyno and can help you out im sure.

 

vishnu stg1, both cams retarded -5 made some mad top end. when i swtich over to 264 on both side and left the settings the same with no tuning i felt crazy torque all over the rev range with the butt dyno.

 

any one got a link to that?

 

-5,-5

 

Advancing your cams will give you better low end torque. Retarding you cams will give you better top end torque/horsepower.

 

If you need tire shredding torque you may want to consider a big block V8.

If you want better low speed torque, as EvoTio pointed out, retarding the cams is going in the opposite direction. You could advance them to make the turbo spool a bit quicker, but you'd likely sacrifice some top end power potential given the relatively short duration of the factory cams.

 

If you really want to do this to your Evo ( great low end ) . Switch to a smaller turbo maybe a 14b or smaller, 272 intake cam leave the exhaust cam stock. And maybe a 32mm inlet restrictor.

 

What's the best combo for idle? That's teh only issue that i got now...!!! I hate my 272s idle. It's crap!

 

If you have cam gears, set your 272s to -4 Int and -1.5 Exh, and you'll have no more idle issues.

 

I spent an afternoon on the dyno working through a number of different cam settings. The basic settings I tried were:

+4/+4 +2/+2 0/0 -2/2 -3/-3 -4/-4

Generally, the more advanced the cams, the more bottom end I had. Settings around the +2 and 0 ranges seemed to have to most torque for my car (with Piper Rally cams - 11.5 lift, 265 duration; stock turbo, etc).

After the basic testing I started to seperate the intake and exhaust timing, which added a bit more power (about 10 HP and some torque) with my car. I ended up at 0/-3, which seems to be a good compromise between high RPM HP and low RPM torque with my set-up. As others have said, less overlap meant better idle, as well. Proper engine management (XEDE, UTEC, AEM EMS, etc.) is assumed.

As for tire shredding low end torque, be sure to have a very experienced tuner set your car up. What your asking for can lead to alot of "engine shredding knock" if it's done wrong.