I dyno'd 285 rwhp in Febuary, since then I have gutted my cats, and will soon have my electric fans, as soon as I get my pcm done, will I make
300 rwhp after I get the fans on? I would think it would be pretty darn close.
Yes, I did feel a little difference after I gutted the cats, not a major improvement, just like the truck sure feels more responsive, IMO.

 

If you have good air I think its very possible. Its going to be heavily dependant on the outside conditions IMO.

 

OK, What if the conditions were exactly the same, just to say?

 

The fans don't make a huge difference unless they were on durring your last run... The cats may or not make a difference depending on what happened to your tune after you gutted them. Most times it is best to retune after you delete your cats to get your AFR back in shape.

 

I dont see why you couldnt hit 300. My friend(CAMMIN03) hit 306 or something close to that with a 212/218, edlebrock shorties and gutted cats, I think his torque was around 327. He has the stock fan in also. Im surprised that with your heads and roller rockers you arent there already.

 

I think you'll be really close. I dyno'ed 270rwhp before my fans/crank pulley. After those it gained 16rwhp. I say go ahead and get a crank pulley and shoot for 310rwhp

 

did you have your previous dyno figures on a "Corrected" scale? if so running a "Corrected" dyno this time will give you a more accurate comparison so that you could see how much you actually picked up.

For instance, When I had my 4.8L with true dual exhaust and a UPD on 20" wheels I dynoed 201 rwhp, Then I ran again under a corrected setting (helps to rule out things like humidity and weather..to an extent) and it showed me making 199 to the rear wheels.

Depending on the variables in your previous run, I think you could hit the 300 mark with the gutted cats, right tune. You're looking at 15 HP, between a decent tuner and gutted cats you should see that, if not throw on an ASP.

 

First dyno was on corrected, and it was absolutely pouring down rain at the time, might have to find me pulley.