Dynamometer Results & Comparisons - F13/header numbers inside!

Numbers are with the cam on a 112+4, pacesetter headers and a TSP catted Y pipe with a cut out, a march pulley, and Stock TB, and my Stock injectors are completely maxed out at 100% so he said thats all he could do with it for now.
Uncorrected :408rwhp & 397 RWTQ
Corrected: 390 RWHP & 379.8 RWTQ
I am pulling about 310RWTQ and up from 2000RPM all the way to 6800RPM
Let me try to post the dyno graphs.

Is this tuned? Numbers look good.

even with the 4* advance it appears to peak way early to me.

Maxed out? What was your air/fuel? Looks good, none the less. I think with a TB and !CATs you would be right at 400. Actually I am hoping for very similar results. I want to hit 400+ with my F13 and tuning. Anything over 400 and I will be :headbang: happy as shit.

even with the 4* advance it appears to peak way early to me.


Good catch. Yeah, that is weird.

Mine did not max out untill around 6400-6500. carried well over 6800. I dont have a scanner to post a graph but I can see if Candy can email it to me. Mine is an awsome power curve on hp and tq.
I do have a little better then stock heads which may move the peak up a little.

Well this is tuned and I lined it up dot to dot dont know what else to tell ya

Well this is tuned and I lined it up dot to dot dont know what else to tell ya

Dot-to-Dot isn't exactly full-proof.

That may be so, but i cranked it over a few times and it was dead on everytime it came around.

Good to see you got the cam in, nice number. Did they say why they thought you were max'n out your stock injectors? Just curious because we have started hearing this alot lately and we have never ran into this issue at 400 rwhp.

Good to see you got the cam in, nice number. Did they say why they thought you were max'n out your stock injectors? Just curious because we have started hearing this alot lately and we have never ran into this issue at 400 rwhp.

I was wondering that too. I thought the 28.8's were good to around 450rwhp.

He didnt offer an explanation as to why they maxed out, all he said was that they were so i'm gonna have to buy some new injectors. Thanks for the cam by the way.

Dynoed mine on Tuesday. With AS 5.3 heads it did 435/409 SAE corrected in some crappy Florida Humidity (98%). I was looking for a few more, but weather conditions soaked those up I believe. Very happy with the cam and the power/driveablity it offers. Mine is a 112+4 also and peaked about 6350 and the injectors are fine on mine. The duty cycle is getting kinda high, but it held 12.9 A/F till 6800 with no signs of fuel issues. Good numbers man!

hmm this is intresting... good numbers regardless.

even with the 4* advance it appears to peak way early to me.

Looks fimiliar....

how does it look familiar?

well i heard futral cams +4 usually peak around 6200 and have great under the curve power, that one looks like its sub 6000 peak though.

Well if it makes any difference, he didnt want to go too crazy with timing because of the duty cycle on my injectors and my car seems to like a leaner a/f mixture.

He didnt offer an explanation as to why they maxed out, all he said was that they were so i'm gonna have to buy some new injectors. Thanks for the cam by the way.


Injector Duty cycle was at 111% on the last pull AFR was about 12.9:1 leaner than I like to put cars at, typically i like 12.5-7 or so. his timing advance was 26-27 degrees, one he has cats, and two its a tad lean. I tend to lose control of an injector around 100% and industry standard is have them at 80% DC or less.

Thanks Nick! It was great working with you. :)

Those numbers suck........J/K What should that run in the 1/4 if this guy can drive??? I need a cam in my Hawk or Z06 now :(

Good to see you got the cam in, nice number. Did they say why they thought you were max'n out your stock injectors? Just curious because we have started hearing this alot lately and we have never ran into this issue at 400 rwhp.


Allan made more power than that with my motor and he said nothing about the injectors being maxed out. That does sound wierd?

Mine made 420hp and 405 tq through the 12 bolt and 4.30 gears . stock 26 lb injectors and tuned to 13.5/1 a/f on allens Dyno . No signs of a fuel problem either and we pulled it to 6800 every pull. peaked around 6400 rpms

Thats weird,
While you do have heads and a ported TB, you have smaller injectors than mine. I wonder if a few of us could have gotten smaller or a bad batch of injectors in our cars. I also think my clutch is about to give out. Your 12bolt and 4.30 gears arent helping ya out either. I'm gonna go ahead and Port my TB and get some larger injectors and see if that doesnt do the trick.

Mine made 420hp and 405 tq through the 12 bolt and 4.30 gears . stock 26 lb injectors and tuned to 13.5/1 a/f on allens Dyno . No signs of a fuel problem either and we pulled it to 6800 every pull. peaked around 6400 rpms
Do you mean 12.5 or did you guys dail it in lean. Mine make more power that lean, but I was scared to set it there for the street. Thanks bud!

not bad at all :devil:

how does it look familiar?

My car does the same thing.

http://home.insightbb.com/~herrieschopper/224fm11.jpg

The blue graph is with my FM11(114+4) and TEA Heads, the red is 224(112+0) and TEA Heads.

My car does the same thing.

http://home.insightbb.com/~herrieschopper/224fm11.jpg

The blue graph is with my FM11(114+4) and TEA Heads, the red is 224(112+0) and TEA Heads.


So you lost power going to a FM11 over a 224?

damn sure hope not?!

So you lost power going to a FM11 over a 224?

:nod:

My car does the same thing.

http://home.insightbb.com/~herrieschopper/224fm11.jpg

The blue graph is with my FM11(114+4) and TEA Heads, the red is 224(112+0) and TEA Heads.
how the hell is that?

We don't know. The only change in my car was the cam swap, LS6 to 78mm LSX intake(Made 5hp on another car), Mac headers to Flowtechs and a Hooker Catback from True Duals. We thought it was the springs so I swaped them out and that didn't help either.

I have since put my setup close to where it was before. I removed the LSX intake, put a set of Pacesetters on and back the True Duals. I am hoping to get the car dyno'd in the next few weeks. But yea, even with that setup, I lost power over my 224 and it didn't make NEAR as much as I had expected with the TEA heads.

Thats odd , although the 224 is a great little cam.

Yea, its very odd and noone seems to know why. Or the fact it didn't make any power past 6100.

ttt...

Odd. Seems like there has to be something else going on. Was this a monitered tune(IE: AutoTap/ TechII etc.?) Is it possible that you've got some weird condition that isn't allowing proper injector pulse widths/rates? Sh!tty gas lately? Just seems like 111% DC, 12:9:1 A/F, & 27-9* w/that setup means something(relatively simple)is holding it back. What's the FP look like @ WOT?

While(I realize)I'm running heads, I pulled 436/416 w/a smaller cam(F11), 29*, and 12:5:1 A/F(through a 12 bolt/4.56's/slicks), with no DC issues.

No pro here... just some thoughts....

Keep us posted.... Good luck!

what did you log your duty cycles with?

I will do some math for the people that think this is impossible.....

when comparing duty cycle to hp and AFR you need to use uncorrected numbers his were 409 rwhp(colder weather means more hp which means more fuel!) I beleive, which equates to 409/.85 to get the 15% horsepower loss and fwhp is ~481 now, most LS1s drop to about 55 psi fuel pressure at WOT due to thier intank regulators, which lowers the injectors from 28.8 to 28.0x big deal.

So at the BSFC of .5 where a NA engine typically runs, the horsepower at 111% duty cycle is calculated hp is 498, so we are off by about 17 hp, so we are pretty close to what is actual, that could easily be covered by being off a psi in fuel pressure, or a few hundreds in BSFC or a few % in drivetrain loss....... hope this helps some people, out.
I will also state yes these injectors can do a lot as far as HP wise, but they are completely out of control in the 400-420+ rwhp range.

Odd. Seems like there has to be something else going on. Was this a monitered tune(IE: AutoTap/ TechII etc.?) Is it possible that you've got some weird condition that isn't allowing proper injector pulse widths/rates? Sh!tty gas lately? Just seems like 111% DC, 12:9:1 A/F, & 27-9* w/that setup means something(relatively simple)is holding it back. What's the FP look like @ WOT?

While(I realize)I'm running heads, I pulled 436/416 w/a smaller cam(F11), 29*, and 12:5:1 A/F(through a 12 bolt/4.56's/slicks), with no DC issues.

No pro here... just some thoughts....

Keep us posted.... Good luck!

Not to hi-jack his thread, but what is the ICL and LSA of your cam? My FM11 didn't make good numbers at all.