Re: NO lean Issues
Originally Posted by BrianBrave
I've not seen an ASP 178mm pulley - but from what I've seen on the ASP website and what I've read on the forum; the 178 is only a "press-on" outer belt ring using the OEM hub. This would help eliminate alignment issues due to manufacturing tolerance problems. Plus - I bet you can access all the water pump bolts without removing the pulley. With the two piece 185MM design - you have to remove the outer hub when you remove the water pump. Not sure of the 181mm.
I'm guessing that's the main reason behind the ASP design - that and to ensure the OEM belt fits. (a big marketing strategy) Not over-boost issues if it only comes down to 1 PSI.
Regardless of what pulley you install - would you have lean issues if you didn't raise the RPM rev limiter when you tune?
Could you compensate for these lean issues with proper tuning techniques if you do raise the rev limiter? Is that something that's easy to do with a "mail-in" tune?
True data-logging at 180MPH can't be over looked
Just some random thoughts rolling around.....
Sure, there could be multiple marketing reasons for the designing of 178 pulleys. It’s not farfetched that part of the design also takes into account certain limitations of our setup, if there was no acceptable solution to overcome those limitations. The 1 psi is the difference between 12.8 a/f in 3rd and 14.0 a/f in 4th and 17.xx a/f at 21 psi in 4th as well.
You would have a leaning issue regardless of the pulley you run because of increased boost over stock. The problem is when you reach 20+ psi, for me in 4th gear in cooler weather is when the lean issue becomes unacceptable or detrimental to the engine. I think you would still have a lean issue if the rev limiter was not raised because max boost is obtained around 5300-5500 rpm. Maybe reducing the rev limiter via tune could work
; if it could be raised I don’t see why it could not be reduced. How much more power do we make from having the rev limiter raised over factory setting?
::Edit::
Not over looking high speed datalogging/ Tuning, but 20+ psi was not reached.
Last edited by SRT6 Gang Member; Apr 18, 2010 at 11:06 PM.