Well tryin to do a few things to the car before I get it dyno tuned again. Just wondering if going from a 58mm BBK to the ASM monoblade would net some impressive gains. The car is a 383 with le2 heads and a le3.2 cam with all the bolt ons.

 

no. jmho

 

I think you will find the to be a common response.

 

I dynoed at 500 flywheel HP on my 381 with the 58mm throttle body only 77% open. Opening it farther did not increase air flow.

 

The idea is to keep the plenum as close as posible to 100kpa at wide open throttle. So at wide open throttle and say at max rpm what is your kpa reading?

If you are lower than 100kpa then the question is by how much and why. Is the air filter the restriction? Is it the air intake track? Is it the throttle body? These are questions that need to be answered.

Is there a big perfomance gain to be had? Probably not unless you are after every last horsepower.

 

i would think you need more headflow and more cam to take advantage of the monoblade. I dont think your setup is extreme enough for it to make any difference. Maybe a few hp (5-6)

 

Compare the MAP to barometric pressure, which may or may not be 100kPa. You get both data points with a scanner.

 

Thanks for the info. I'll talk to Ed when I go dyno again. I got a feeling he'll sat it's not worth it. I've heard that it's hard to get the car to idle with them so.

 

Let me add to the post a little bit. I'm currently running the AS&M monoblade on my 1989 TransAm. I thought the fluctuations in my KPA at high rpm was the intake system not being able to keep up with the demands of the motor.

With a huge K&N air filter and 3.5" cold air intake pipe I knew those were not the problem. So that is why I went to the 1300cfm monoblade. Come to find out my problem may have been reversion because of weak Comp Cams 26918 beehive valve springs with my XFI 268 cam. They tested between 95 and 100 pounds at 1.800". At the installed height of 1.750" the poundage did not change. However at 1.200" they were at 330#.

Let me qualify this in that I'm also running a Yank SS3600 converter. Anyways I have no drivability or idle issues with the monoblade. In fact no problems at all.