tennblkc6

^ this... /thread

brightc6

There was no before dyno pull, i bought the car bone stock, first time out the balance fell off so did the cam and headers all at once.

brightc6

Shawn is a good guy, he has helped me out in everyway he can. I have no reason to think the tune is off. He said he wants to port it and redo the dyno, he is giving me a good deal so that will be happaning next week.

brightc6

Also why is it so far fetched to believe my car made good numbers?

timd38

I did a cam and LS3 top end and picked up 100 RWHP using a FAST, already had headers, so I have to agree that the first numbers appear high.

BLOWNBLUEZ06@RKT Performance

Best thing would be (or would have been) to have some track times, make your changes and hit the track again. Dynos mess up. Look at your correction factors for each day. If the weather station values are messed up in any way, it can throw the numbers off on either of the days you dyno'd.

irok

your original numbers look great.appears you picked up approx. 110rwhp with them. who knows why your new numbers arent showing much of a gain.my auto LS2 car picked up 65rwhp with ported Fast and OBX LT's with no tune.what size converter are you using in car? just my opinion but that has to be one hell of a camshaft to make that kind of power in a LS2.

brightc6

stock converter...I drive the car on trips and didn't want to worry about it have any tranny heating issues.

as far as track times go....I did go to 1000ft track while I was in Arkansas so really hard to just times off of that. car ran 9.70 at 111mpn with 1.95 60ft. Keep in mind that is still 320 ft short of a full 1/4 so that means car should be solid 11 second 1/4 car on street tires.

dennis50nj

Is your v max ring on both before and after? also it has to be a tuning or wrong correction factor, the proof is in the pudding, the fast intake in 90 92 102 has shown great gains in the LS2 in all cases I have seen. I myself have seen no less then 30 tq hp over the whole entire rpm band with just bolt/ons, so if you haven't and nothing else has changed, the tuner is great, then maybe a bad injector, I'm just guessing. but your tuner should know, I just ask you this. do you actually think with all the testimony and proven dyno and track times that you have the only fast that shows such insignificant gains, maybe a defect, send it back and get another one or have the tune figure it out because it makes no sense, was the converter locked and in the same gear both pulls

brightc6

yes asked those same questions...converter locked both pulls, same gear both pulls, both numbers are corrected. trust me I have read all the threads about how great the fast intake, hints why I spent the 800 bucks for one. As for it being defective that is why the tuner wants to take it off and check everything out in the intake.

I doubt it is a bad injector, car has no miss and runs very smooth.

dennis50nj

I have seen a couple run very smooth, and the dyno was lower then expected they found a bad injector, i have seen broken valve spring with no signs of a miss just a lot slower et

0FederalPerformance

What the hell is a V Max ring?
And I'll never understand why people will bolt on all these parts to a set of poor flowing stock cathedral port 243 heads and expect to gain a million hp... The intake valve (and those stock LS exhaust ports) are always the biggest impediment to airflow.
Buy some AFR's or TrickFlow 225 heads and see your numbers really climb!

nullpointer

Wondering the same thing??

What about CNC / valve job 243s?

irok

what tire did you have on the car for the 9.70 1000ft?your car should easily run an 11.40 with a tire on it

Danny Richie

When I upgraded my LS2 I opted for a CNC ported set of Pro Comp heads. Comparing them to the stock heads the intake runners were notably bigger. I should have taken some side by side pics.

My thoughts on intakes is that they should match the heads. Runner openings and sizes need to be the same especially at the surfaces where they meet. And in this case the differences were pretty significant.

I thought about ordering a Fast intake, but then what head are they sized for. Are they designed to fit a stock head with those small runners? And spend in excess of a thousand bucks to pick up maybe 15 to 20 horsepower at the most?

I decided to pick up a second stock intake for a couple of hundred bucks. I then made a pattern from my CNC ported heads and securely mounted to the head. I then mounted the intake on it and tightened it up just enough to insure it was centered. Then I pulled it off transferring the pattern to the intake. Then I spray painted it white. The difference in the size of the runners on the new CNC head meant that the intake needed to be opened up right to the limit of what it allowed.

Porting it was real easy. Plastic grinds away a lot easier than steel or Aluminum heads. Sanding rolls were all I needed for my die grinder. I continued the pattern size as far up into the intake as possible and smoothed out a lot of rough casting spots.

I was real happy with it and have a port matched intake and that alone probably picked up as much or more power than going to a Fast.

Just thought I'd share that with you guys, for whatever it's worth.

C7&7

I don't think anyone is saying it's far fetched, we're all just saying the car is actually at the numbers it should be with the fast102. Especially being a Automatic car. 450 is what ls2 cars make mild cam, headers, and fast.

My advice is let the car be, and don't chase a dyno number.

tennblkc6

an over priced tornado

dennis50nj

or get them ported by a shop like Cartek who really knows how to extract the power from the 243 head

96mogt

And what gains did you see from your PRO Comp heads???

Danny Richie

I did heads, headers, intake, air cleaner, torque converter,and everything all at once. So it is hard to say what each thing made. My best guess is the heads made a good 50 more ponies over the stock heads on a motor like mine.

I did a mini review of the heads. If you are interested I'll find a link to it.

I haven't dyno'ed it, but will be taking it to the strip on Saturday.