Hey Guys,

My tuner just finished up and gave me the news. 442HP/420TQ (SAE and 86 degrees outside). I'll put up the chart tomorrow, but I had 426HP before the Fast 102 Vengence and Slightly larger Cam. (from 224/228, .581/.588 on a 115 lsa. to 226/226 @ .598 114 EPS)

I haven't seen the curve yet, but I have before and after Fast 102/Cam. Hopefully the curve shines cause I hoped for more than 20HP. Thought I was going to be like 475RWHP. Other weird thing was he told me IDC was 86% on 46lb fast injectors. So I know its using fuel.... Let me know what you guys think?

Thanks DOA

 

475 is high expectations for that little cam. I know some have done it with similar cams but that to me is the exception rather than the rule. I would not be disappointed if I was you, I have known guys with 6-10* more duration cams and barely (-15) make more hp than you. Enjoy the new power...

 

I figured 475 was optimistic. I just hoped for more. I did take the car out and I can feel the difference. Thing keeps pulling all the way. I'll put up the Dyno Graphs tomorrow at work. I have to scan them in.

Thanks

Lance

 

I think it looks good for such a small cam.

 

What is your compression? I now this may not be popular but I think the hole small port/velocity thing may be pushed to the extreme here... I am wondering if the 225cc would have yeilded better results.... I think the 205's will limit your yeilds.... then your running -2 of overlap...... Sorry boss, but I belive you need some, you don't have to go overboard but some can be beneficial.....

 

10.83:1, 8.29:1

 

This is an LS2 2005 vette right?

 

Yes it is. Whats your thought?

 

Aight lets look at this

Sounds like you did not mill the heads and they are the 65cc, I prob would have milled them to 62cc at least to get the comp up....
Second, these heads are not as sensitive to overlap as such as L92's etc... Some overlap can be good, especially for top-end power... I think you are choking the motor and I would bet the house that if you would have gone with a 225cc or 235cc, you would see a different motor.... From a 205cc... But I know a lot of guys say they want driveability.... and driveability is subjective to the car owner.... But there are trade offs with driveability..

Now I know we have AFR-ites and their is a strong following here but, I am just straight up and have no allegance to one product....

The cams I like to run are cams with a little more lift, that have fast opening ramps and close slower to gentely lay the intake valve down on the seat and not slam it down... With some good springs you should be covered... The exhaust side is debatable but I run the same on the intake/exhaust lobes... Open quick, lay it down gently....

I cannot say the cam is soley the issue.... But looking at your setup, the 442HP is prob right around where it should be... If 475HP+ were you aspirations, you going to need a bigger head...... Remember, all heads are air pumping machines... They have no clue what exhaust,intake,computer etc... you use... Your heads basically do what ever your cam tells them to do in correlation to CI..... I know some have done it but I would have not ran the 205's on an LS2 and especially if top-end power were your aspirations....

Maybe a 230/230 or 230/234 with the milling to 62cc comp bump to help regain the bottom end low to mid range torque.... this would still be streetable on a 113 even a 114 LSA....

But not bad, still at 1.2 HP/CI.... even though most like 1.5

 

Thanks for the advice. I don't plan on digging into this thing anytime soon, at least not during the warm months. But I will have to look at larger heads. Those are easy to swap. However, I assume if I put larger heads on, the Cam will no longer be ideal for my heads. I don't really look forward to swapping cams again, what a PITA. I just wish I would have done a UD pulley when I was in there. Suppose that would have be worth a few.

 

Ya 475 is quite a bit, If you want to reach that with that cam you are going to need to have your intake ported along with having your heads worked and milled a little and that still might not get you there i dont think. The easiest solution to me would be getting a bigger cam and an under drive pulley and see where that puts you.

 

You aren't going to gain anything worth mentioning going from a 224/228 to 226/226. Geoff's lobes are probably going to be a lot more quiet and stable at high rpm, but significant power gains out of a 2 degree change isn't going to happen. If you doctor most 224 lobes, they're in the 224-225 range anyway.

The gains you saw were more than likely all from the FAST by itself.

 

Cool Guys. Here is the Dyno Card after the Upgrades, I'm still looking for the Original. How does it look?

 

I think that looks pretty respectable for your size cam, You got almost 450rwhp out of a easily streetable cam, that's pretty good!

 

looks nice the way it carries past peak too...

 

Something is not right here, why in the hell is his IDC at 86% on 46lb injectors
on a 6.0 AFR 205 head?


on your cam, what are your durations @.200?

I still probably would have run that joker on a 112 or 113.... if you were sold on the 226/226

112= 2* overlap
113= 0* overlap

maybe even a
111= 4* of overlap which is still streetable and tune able....

The 114 LSA +2 just shifted your torque curve far left to a lower % of usuable torque...

Advancing it +4 combined with a lower LSA would have taken take advantage of the 205cc small port high velocity port design..... The torque would have been through the roof....

I know you are set and tapped out on this build but here is what I posted before helping a guy with his setup and the correlation of torque:

That cam 226/226 is bleeding of valuable cylinder pressure..... which is affecting your torque output and may contribute to why your not reaching 400lbs of tq until almost 4800 rpms then it falls off below 400lbs at 5500...

With those heads on a 6.0 I have seen them reach 400lbs of TQ at 3500 and hold it until 6300 rpms...

Nice build though jsut a few tweaks to get more power.... I feel you are leaving power on the table....

 

Cam @ .200 is 148. This cam was supposed to be spec'd for my heads. I'm also confused by the 86% duty cycle with this much HP. If I use the calculator I get a lot more horse if using this much fuel. Don't the Vette's run at 58PSI? If its 43, the math works out.

-DOA

 

Ok, Here is the before Chart Fast and EPS Cam Chart. This Chart is STD so Its probably 2% high.

Looks like a lost some TQ down low and in exchange for a little more Peak. Probably like 25+ after you factor the correction and heat and humidity change. Seem like its not worth losing the low end torque for the Peak @ 4800ish.

Horse power gains look all the way through the range getting larger at the top. Looks like 25+ for horse too, but gains all the way up look better than TQ.

-DOA

 

And this is the big debate..... Do you want a max effort cam or better avg cam..... I know here and around often times guys get caught up chasing HP.... HP is addictive and an expensive habit..... Most normal driving occurs between .100-.400 lift and idle-4000 rpms for a typical street car... Now I know some loose cannon guys will argue against this but for a typical DD idle-4000... If your car spends 98% of the time in the idle-4000rpm range then why do guys get cams or setup combinations to reach a range 4000-6500 where they will spend less than 2% of the time with typical driving behaviors? Unless you live in the country or the Autobhan in Germany... I like more low end and midrange power...

So again the choice of street vs strip is at hand..... And building race cars and performance minded cars are not cheap and usually do not have long lives...

If its a street car, give me a cam where I build 400lbs of TQ at 2500-3000 and hold 400lbs to 6000rpms, because on the street, I will tear that high rev, guys azz up from light to light... Now he may get me in the 1/4 but who runs a 1/4 on the street?

Now you tell me which car will be faster.... the car that builds 400lbs of torque at 2500rpms? or one at 4800rpms?

"Horsepower sells cars, torque wins races"- Carol Shelby

Torque gets you out of the whole, Horsepower carries you through the top end....

 

Thanks.

Does anyone have any ideas why my IDC is 86% on 46lb fast injectors? Shouldn't I be making alot more Horse with that much fuel?