Sparky

Ran a baseline before head install:
- B1 cam, LT Headers, LS6 Intake, Ported TB.

Only change was installing the GTP Stage II heads and I picked up 18 rwhp. Does that sound about right? I was hoping for a little more? My B1 and LS6 intake picked me 40 rwhp so that would put heads, cam and intake at 58.

Mark

HOSS99

Has it been tuned with LS1 Edit yet? Ther may be a few more ponies to squeeze out!!

NOBR8KSS

iTrader: (12)

B1 is a small cam for Stage II heads, but in any case I think you should have gotten around 30 rwhp from those heads. There is definitely some power to be gained from computer tuning...I would look into it. At least check your A/F ratio...it should be around 12.8:1 at WOT for max power.

SB

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> B1 is a small cam for Stage II heads, </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">. NOBR8KSS, you're kidding right?? <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

steve

<small>[ March 29, 2002, 08:20 AM: Message edited by: SB ]</small>

Trevor @ Texas Speed & Perf.

iTrader: (3)

Considering that you're already running a cam, you definitely should've seen more than 18 RWHP! The B1 is a nice, "moderate" cam, and you should be seeing more power than that from the heads. Were you running a Tech II or AutoTap when you dynoed it? I would start with checking out all of your #'s.

gator's 99TA

iTrader: (2)

that is very low i think. i picked up 50 RWHP with the hotcam (truely a small cam) and headers alone. heads should give you a solid 30+RWHP. check the timing for sure.

NOBR8KSS

iTrader: (12)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by SB:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> B1 is a small cam for Stage II heads, </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">. NOBR8KSS, you're kidding right?? <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

steve</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">well..call it a smaller cam than I would use. Isn't the B1 a 221/221 cam? I know the G5 cam wasn't available when you did your cam, but it is what I would use now.

VINCE

iTrader: (1)

It would help to know your final #'s.. If you were already around 400rwhp then I would say you are close to what the norm is w/out tuning. If you are still below 400rwhp then I would say something is wrong. Autotap and look at your timing and other levels..

Sparky

These #'s are from a Mustang Dyno, so take that into consideration! (my stock #'s on a DynoJet were 289 and on this Mustang they were 267!!)

rwhp before = 341
rwhp after = 359

On both runs:
- O2's were .9 to .91
- NO KR
- Total timing averaging -28
Both dyno runs are show a dip around 4800 to 5000 (think I actually need to pull a little time out here)

Current tuning installed is MTI's. Next step will be wide-band / LS1 Edit tweeking.

Thanks!

Mark

VINCE

iTrader: (1)

Mustang dynos are notorious for being low. I would look into a real dyno. Your other numbers look fine.. 28 degrees of timing and your O2's look great.. Your starting point was real low.

gator's 99TA

iTrader: (2)

ok well i would be more concerned with the total increase in power. it does not matter the total power. since you measured using the same tool, i would not think it mattered that you used a mustang dyno. yes mustang dynos record lower, but are still consistent.

i hate to say it but there is a problem with only an 18 RWHP gain. no matter what you baslined.

Sparky

Yea, I agree on both counts Mustang are low and what I really wanted to monitor was the delta between the 2 runs.

I don't see any obvious screwups?? GTP have been good performers (from other posts) My setup before was strong. All indications are the install was done correctly. (Took some cruise baseline data: ltrims are within 1% of each other, no misfires, seems to run well) And tweeking the tuning around those peak cyl pressure RPM's should bring the curve up but won't (at least shouldn't) increase peak HP??

I'm baffled? And considering I've made a ton of changes since last seasons track runs I'm not sure how much that will tell me. (stall upgrade, chrome moly DS, 12 bolt with 373's, exta wt with roll bar, etc)

Welp, this is the story of my life with this car (just like me in school) never quite failing but always an Under Achiever!! <img border="0" alt="[chug]" title="" src="graemlins/gr_chug.gif" />

Mark

gator's 99TA

iTrader: (2)

your timing is ok? no KR showing up? also did you account for the loss in power with the drivetrane (bigger rearend eats up power) correction factor ok on the dyno?

66ImpalaLT1

Why dont you post the graph with old and new overlayed? That way we can tell if its a problem thats mostly happening at peak, or all rpms.

Eric

Pro Stock John

iTrader: (34)

Mustang or Eddy current? dyno is loadbased, so the #'s are different than Dynojet. The overall dyno #'s are lower. So, might the gains be lower too?

VINCE

iTrader: (1)

Now you missed the part in the beginning about the stall, 12 bolt with 3.73's.. Another person I know had a similar setup and dyno'd in the 360rwhp range and ran 11.5 at 118mph on motor. He had big stall, 12 bolt and 4.11's.. Like I said b4.. I have seen mustang dyno's dyno 20rwhp plus lower than a dynojet. I would got to someone with a dynojet and see what you have. Dont expect to be over 400rwhp with your combo. Do not compare your car with another persons car. Too many factors to affect dyno #'s.

Sparky

Thanks guys. The new rear and converter is the reason I ran an extra dyno just before the heads (wanted a true compare). So the before and after dyno numbers are with the same drive train in place.

Yea John, I agree, the delta numbers would be equally lower (% wise) than I dynojet. Just for the hell of it, I may run on a Dynojet next week for a compare.

Don't get me wrong, I've learned not to get too excited about dyno readings!! I'll do my real world testing a 1/4 mile at a time (that's what counts anyway, right!) I was just a little surprised focusing only on the delta from 2 back to 2 runs (heads as the only differnce).

I'll try and scan in and post just for reference.

Mark

Black Sunshine/ 00SS

iTrader: (1)

It dont matter what the dyno says Mark. As you know, I my car read 300 on that dyno & a few weeks later went our & ran 11.50 all day. Get it to the track, & comare your track times to what you ran last year. I think you will be very pleased. I'll give you a buzz when I get my heads (manly valves back ordered <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" /> ) & we can get together & see how they work out.