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EPS, PRC Stage 1 LS6, FAST 90/90

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Old 05-07-2011, 10:22 AM
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Default EPS, PRC Stage 1 LS6, FAST 90/90

First off ill say last year i has a Torquer v.3, Ls6 intake, and the same heads. Car made 423 with that setup with a ls7 clutch, stock t56 and Moser 9".
Decided around january to start modding the car some and decided to try one of the eps cams, and got a Fast intake and nw tb to put on the car as well. Here are all the mods on the car

MOTOR-
Forged Mahle Pistons with -4cc reliefs
PRC Stage 1 LS6 heads-no milling done
EPS 234/246 111
FTP 98MM lid
Delphi 85mm MAF
FAST 90
NW 90 Tb
42lb injectors
LS7 lifters
Comp Trunion upgraded rockers
U/D Pulley

TRANS & DRIVETRAIN
Monster LVL 3
RPM LVl 5
Dennys Nitrous Driveshaft
Moser 9" with 4.11's and wavetrac


Car was tuned and dyno'd at norris motorsports. i was expecting somethine over 450, i realise you shouldnt aim to high but it seemed realistic to where i was last year.Ive got a racetronix pump and harness and the car had an open cutout. Heres my issue, the car only made 438/390 and last years was 423/395, but i also had a paper air filter in last year and no air filter on the dyno this year. not understanding the drop in torque, and still am trying to convince myself the numbers arent low because i truely believe they are. I will post pics of the graph later just looking for some input. Are the heads holding me back, i dont see how they could be the culprit because guys run 243's all the time making good power



the read was last year, blue is this year, for some reason this is the 434 graph never got the 438 one...

Last edited by 94 s dime; 05-08-2011 at 12:21 PM.
Old 05-07-2011, 10:48 AM
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Dont harp on dyno numbers! I was just on the rollers a few weeks ago and made 433/390 n/a and ran 11.09@124 with 60lbs more weight from the roll bar. Last year I made 447/415. and ran 11.41@122. I went faster with less power and more weight. This is why I dont believe in dyno #'s, its just a tuning tool.
Old 05-07-2011, 11:10 AM
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I'm with you guys; I spend too much time checking this section and I realize plp are always putting better number than me, but their 1/4 time doesnt match the hp. Its tempting to chase a number though.
Old 05-07-2011, 11:32 AM
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it just bugs me because it was the same dyno, and everything from last year
Old 05-07-2011, 12:04 PM
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Same time of year and weather too? Has the dyno been calibrated lately? Those things can change the outcome some.
Old 05-07-2011, 01:04 PM
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pretty similar weather..unsure of calibration
Old 05-07-2011, 02:09 PM
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I never seen a drop when changing mods on the same dyno for years on my ls1 set up.
Old 05-08-2011, 12:22 PM
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graph added, any more input?
Old 05-08-2011, 02:19 PM
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Through that valvetrain, i dont think the numbers are to bad
Old 05-08-2011, 03:53 PM
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So pretty much to sum things up you removed Torquer v.3, Ls6 intake and installed the EPS cam and a FAST 90/90 and gained 15rwhp.
Old 05-08-2011, 09:57 PM
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basically.... and took the air filter out.. but lost torque and midrange..
Old 05-08-2011, 10:46 PM
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Whats up with the a/f on the graph?
Old 05-09-2011, 08:15 AM
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Originally Posted by 94 s dime
basically.... and took the air filter out.. but lost torque and midrange..
Well, the torquer line of cams are supposed to give you lots of torque and midrange right? That could be one reason for the slightly lower torque and less midrange. Looks like the torquer cam was making good power for your setup..

The cam swap might not have been worth it for your particular combo. So look at it this way. Most of the HP gains could have come from the 90/90, and maybe a couple of HP from the cam swap. Numbers dont seem bad through a heavy drivetrain, and we all know stalled auto cars dont dyno high but are beasts at the track.

Did you use the same pushrods you had, or did you remeasure for the EPS cam?
Old 05-09-2011, 11:45 AM
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what tires did you dyno on???

Rob
Old 05-09-2011, 12:34 PM
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You went to a bigger cam with less aggressive lobes and lift, plus you lost port velocity with the Fast. That's why you traded mid range for top end. IMHO, Chris
Old 05-09-2011, 04:48 PM
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car has 315/30/18 falken azenis on the rear, and i was also curious on the afr's on the graph. Geoff sent me the 7.425 pushrods for this new cam.
Old 05-09-2011, 06:22 PM
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it seems odd that the torquer cam with ls6 intake's curve above 5500 is almost shadowing a much larger cam with a 90/90. was the eps cam degreed upon install?

i would have expected you to gain much more than that from those mods. as always, the best thing to do is hit up irp and compare trap speeds...
Old 05-09-2011, 06:36 PM
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it was dot to dot, i know it could be an issue, but saw another thread where a guy degreed his and was told to just go dot to dot... same way ive done every cam swap ive done and helped with... but i agree the graphs damn near follow eachother...
Old 05-09-2011, 06:44 PM
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Originally Posted by SNLPerformance
You went to a bigger cam with less aggressive lobes and lift, plus you lost port velocity with the Fast. That's why you traded mid range for top end. IMHO, Chris
Are you implying that the Fast 90 is hurting his lower/mid range power? There has been several threads & tests done disproving this theory if so. I picked up power all over the board with my ported Fast 92. Down low, mid and up top and I can feel the gains over the LS6 I previously had on my cam only combo.
Old 05-09-2011, 07:01 PM
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i am going to check the p/r length again this week, dont think thatd be the cause of this.. but who knows, im still stumped theres no honest way people can say its "Normal", my goals were over 450 especially since it made 423 last year and had a clogged paper air filter. but any one else question the "leaner" mixture last year on the graph?


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