Dynojet results - 453.9 RWHP 427.5 RWTQ - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

topgun1 · 05-07-2011, 06:06 PM

After I later discovered a 3" long cut in my pcv hose, I figured out why the car was running so lean (at 14.6 a/f) last weekend at our club's dyno day and producing only 443.5 RWHP and 421.8 RWTQ with exhaust cutouts opened. Even though we were adding 8% additional fuel, the a/f ratio didn't move much since unmetered ambient air was coming into the intake.

So today, I get it back to the tuner and we started the day off this morning with a base run of 437.2 RWHP and 411.7 RWTQ (blue line on graph), which was low again, but now with the pcv hose replaced, the a/f ratio was too rich at about 12.2 (from the 8% extra fuel!). We then went to a fresh program template and made some tuning runs, adjusting the a/f ratio where it was previously to around 13.2 ratio and the car liked it. We also took out 2 degrees of timing. We tried 3, but lost hp and tq so we stuck with 2. We ended up at 453.9 RWHP and 427.5 RWTQ (red line on graph), gains of 16.7 RWHP and 15.8 RWTQ! We had a peak RWHP gain of 19.3 and a peak torque gain of 19. The car was still making additional power after 6K rpm but was too close to the rev limiter. Weather was about 80F in the shop, low humidity, clear day.

I then opened the exhaust cutouts and didn't gain any hp and ended up down a few at 450.2, but gained a bit of torque at 428.9 (green line). Since I don't have the cutouts just aft of the cats, wouldn't expect much anyway where they are just before the mufflers due to clearance issues in other locations. Really there for a bit of noise!

So with about a 16-17 gain in both hp and tq with some minor tuning, was pretty pleased.

Dyno sheet is below.

Dyno tuning program was HP and done by Precision Dyno in Belmont, NC.

ssmike · 05-09-2011, 09:35 AM

Where was the PCV hose cut? Do you have any pics? I had a JRE tune done but Ted had to add 5% fuel. He asked me if I had a vacuum leak but I couldn't find anything. I'd like to pull the PCV hose that you spoke of, where is it located? Thanks!

Congrats on nice dyno numbers!

topgun1 · 05-09-2011, 08:16 PM

hey mike, no pics but it was on the underside of the tube on the white plastic barb fitting that connects into my K&N intake. The tube was on loosely and about a 3" long split was on the underside. Your CAI may be a little different but you should have a tube for pcv connected from your intake tube going underneath the engine cover. good luck. let me know!

ssmike · 05-09-2011, 08:33 PM

Thanks! Yea that's the one I thought it was! Mines fine! Still don't know why Ted had to add 5% fuel. I'll call him to discuss it!

topgun1 · 05-10-2011, 08:13 PM

be interested to see what he says

gearhead440 · 05-13-2011, 10:35 AM

Good numbers! Always good to increase in power with minor tweeks.

Rallyman6 · 05-15-2011, 06:56 PM

Surprised Ted hasn't replied to this thread

05-07-2011, 06:06 PM	#1
topgun1 Drives: 10 SIM 2SS/RS LS3 Join Date: May 2008 Location: Winston-Salem, NC Posts: 1,940 View My Garage	Dynojet results - 453.9 RWHP 427.5 RWTQ After I later discovered a 3" long cut in my pcv hose, I figured out why the car was running so lean (at 14.6 a/f) last weekend at our club's dyno day and producing only 443.5 RWHP and 421.8 RWTQ with exhaust cutouts opened. Even though we were adding 8% additional fuel, the a/f ratio didn't move much since unmetered ambient air was coming into the intake. So today, I get it back to the tuner and we started the day off this morning with a base run of 437.2 RWHP and 411.7 RWTQ (blue line on graph), which was low again, but now with the pcv hose replaced, the a/f ratio was too rich at about 12.2 (from the 8% extra fuel!). We then went to a fresh program template and made some tuning runs, adjusting the a/f ratio where it was previously to around 13.2 ratio and the car liked it. We also took out 2 degrees of timing. We tried 3, but lost hp and tq so we stuck with 2. We ended up at 453.9 RWHP and 427.5 RWTQ (red line on graph), gains of 16.7 RWHP and 15.8 RWTQ! We had a peak RWHP gain of 19.3 and a peak torque gain of 19. The car was still making additional power after 6K rpm but was too close to the rev limiter. Weather was about 80F in the shop, low humidity, clear day. I then opened the exhaust cutouts and didn't gain any hp and ended up down a few at 450.2, but gained a bit of torque at 428.9 (green line). Since I don't have the cutouts just aft of the cats, wouldn't expect much anyway where they are just before the mufflers due to clearance issues in other locations. Really there for a bit of noise! So with about a 16-17 gain in both hp and tq with some minor tuning, was pretty pleased. Dyno sheet is below. Dyno tuning program was HP and done by Precision Dyno in Belmont, NC. Attached Images __________________ 5th Gen Camaros of the Carolinas SIM, 2SS/RS LS3 5/7/11 453.9 RWHP 427.5 RWTQ VMS Stage 2.5 Comp Cams kit, Cold Air Inductions intake, ADM race scoop, DT 1 3/4" headers, Solo cats, 3" Magnaflow catback, Pypes cutouts, HP tune, H&R SuperSport springs, Eibach sways/spacers, TexasSpeed UD pulley, LSR tensioner pulley, Barton shifter, skip shift eliminator, powder-coated calipers, R1 concept rotors, StopTech pads, Granatelli wires, Lloyds mats, tint, AAC afterburner taillamps, AAC scanner/sidemarkers, SRP pedals, custom engine cover, black bowties, Ridergraphix hood spears.... Last edited by topgun1; 05-07-2011 at 06:19 PM.

05-09-2011, 08:16 PM	#3
topgun1 Drives: 10 SIM 2SS/RS LS3 Join Date: May 2008 Location: Winston-Salem, NC Posts: 1,940 View My Garage	hey mike, no pics but it was on the underside of the tube on the white plastic barb fitting that connects into my K&N intake. The tube was on loosely and about a 3" long split was on the underside. Your CAI may be a little different but you should have a tube for pcv connected from your intake tube going underneath the engine cover. good luck. let me know! __________________ 5th Gen Camaros of the Carolinas SIM, 2SS/RS LS3 5/7/11 453.9 RWHP 427.5 RWTQ VMS Stage 2.5 Comp Cams kit, Cold Air Inductions intake, ADM race scoop, DT 1 3/4" headers, Solo cats, 3" Magnaflow catback, Pypes cutouts, HP tune, H&R SuperSport springs, Eibach sways/spacers, TexasSpeed UD pulley, LSR tensioner pulley, Barton shifter, skip shift eliminator, powder-coated calipers, R1 concept rotors, StopTech pads, Granatelli wires, Lloyds mats, tint, AAC afterburner taillamps, AAC scanner/sidemarkers, SRP pedals, custom engine cover, black bowties, Ridergraphix hood spears....

05-10-2011, 08:13 PM	#5
topgun1 Drives: 10 SIM 2SS/RS LS3 Join Date: May 2008 Location: Winston-Salem, NC Posts: 1,940 View My Garage	be interested to see what he says __________________ 5th Gen Camaros of the Carolinas SIM, 2SS/RS LS3 5/7/11 453.9 RWHP 427.5 RWTQ VMS Stage 2.5 Comp Cams kit, Cold Air Inductions intake, ADM race scoop, DT 1 3/4" headers, Solo cats, 3" Magnaflow catback, Pypes cutouts, HP tune, H&R SuperSport springs, Eibach sways/spacers, TexasSpeed UD pulley, LSR tensioner pulley, Barton shifter, skip shift eliminator, powder-coated calipers, R1 concept rotors, StopTech pads, Granatelli wires, Lloyds mats, tint, AAC afterburner taillamps, AAC scanner/sidemarkers, SRP pedals, custom engine cover, black bowties, Ridergraphix hood spears....

05-13-2011, 10:35 AM	#6
gearhead440 Drives: Yellow 2SS, 6 speed manual Join Date: Jan 2010 Location: Concord, NC Posts: 218	Good numbers! Always good to increase in power with minor tweeks. __________________ Hers & His

05-15-2011, 06:56 PM	#7
Rallyman6 Member Drives: '10 2SS/RS IOM, Wht Stripes, Roof Join Date: Oct 2008 Location: Wellesley Hills, MA Posts: 850 View My Garage	Surprised Ted hasn't replied to this thread __________________ 2SS/RS IOM, Wht Stripes, 6MT, IO Interior, Roof, Eibach Sways, BC Coilovers, BMR Swing arms,Barton Short Shift, BBK LT's, GMPP exhaust, Hi-Flow Cats, MAST Stage 2 Cam, CAI = 470RWHP

05-09-2011, 09:35 AM	#2
ssmike BL1ZZRD Drives: '16 Camaro 2SS, '20 Equinox Redline Join Date: Jul 2009 Location: Buffalo, NY Posts: 7,840	Where was the PCV hose cut? Do you have any pics? I had a JRE tune done but Ted had to add 5% fuel. He asked me if I had a vacuum leak but I couldn't find anything. I'd like to pull the PCV hose that you spoke of, where is it located? Thanks! Congrats on nice dyno numbers!

05-09-2011, 08:33 PM	#4
ssmike BL1ZZRD Drives: '16 Camaro 2SS, '20 Equinox Redline Join Date: Jul 2009 Location: Buffalo, NY Posts: 7,840	Thanks! Yea that's the one I thought it was! Mines fine! Still don't know why Ted had to add 5% fuel. I'll call him to discuss it!

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