Hey all, I just got back from my first dyno session, and I must say it was pretty darn fun!!! I think I could do this more often, LOL.


http://amarilloracers.com/cars/natedyno.jpg


My best pull was when I sprayed a 50 shot of N2O, and I got 465 hp and 538 tq. I was hoping for a better TQ number, but the guy didn't start that run until 4200 rpms, and he started the next best numbers at 3800.

I guess it is a big NO NO to dyno your car on et streets, according to the guys at Texas Speed (very knowledgable and nice fellas). I also didn't have a way to lock my convertor. I was hoping for 500, and even though I was 35 away, maybe next time with radials and a locked TC, it will get closer. I also noticed that my car was pulling 9 degrees of timing due to KR, so I guess I need to bypass them (very confident its not knock, just noise) How much would 9 degrees of knock retard be costing me on the dyno?

One VERY odd thing about my dyno graphs were the lack of any kind of HP curve at all. I think it is do to the stock head castings just not being able to flow anymore air, and basically hitting a brick wall, on all 3 runs.

when he got into it at 4400, it looks to have about 452 hp, and it stays within a few hp of that all the way up till he shut off, at 6150!!!! I have heard of flat torque curves, but not HP curves, LOL. I guess a new set of heads are in my future so that HP will climb, instead of just stalling out like that.


Thanks for reading, and any input is appreciated

 

Come on fellas, I need some feedback!!!! What should I do about my heads, and do you think thats what is keeping my hp curve so flat???

Also, about how much hp is the KR costing me?

Here, I'll give you a video to watch... in exchange for your help...LOL



http://amarilloracers.com/webvids/nate4.mpg

 

Looks like theres something causing your hp(and torque) curve to fall or flatten out. I dont think its the stock castings because thats what I was running when I dynoed my car. Could be tuning, knock retard, miss, valve float.... or a combo of several things. You cant really pinpoint a problem just looking at the dyno graph but to me it looks like you have a lot more to gain.

 

So your saying I can get over 100 more HP out of these heads without any porting done to them? If thats true, I feel better. I would like to get 500+ RWHP out of my current setup without the nitrous, and without tearing into the motor.

As for the possible problems, I have the LT4 Hotcam kit, including the springs/retainers, etc. It has a brand new ingition system (day before the dyno run) that consisted of a brand new opti, gm coil, MSD wires, Autolite 103s gapped at 35, and a Mallory 685 to fire it off. I would hope its NOT a miss.

I was getting 9 degrees of KR on the dyno, and I always do with the cutouts open. I need to do something about that. Do you think that had a big effect on my numbers??

thanks for the input.