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01-30-2017, 08:16 AM
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#1 |
 Drives: 2015 Z/28 Black Join Date: Nov 2016
Location: Los Angeles
Posts: 340
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stock Z/28 dynoing at 465 rwhp to 469 rwhp ! seems high !
Lately, I have seen alot of Z/28 dynoing at or above 465 rwhp. That seems very high for a 505 engine hp rating. At 15% drive line loss that is approx. 535 hp... Is it the motor with those COPO heads with that additional power ? or the drive train being more efficient ??
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2015 Black Z/28
70 Chevelle SS396 01 M3, 88 Land Cruiser Last edited by hjdca; 01-30-2017 at 08:30 AM. |
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01-30-2017, 08:32 AM
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#2 |
  
Drives: 15 Z28, 01 Corvette, 96 Corvette Join Date: Dec 2016
Location: Colorado
Posts: 863
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Or GM underrated it like they do a lot of cars. the 1996 LT4 Dyno's at 330 to 360 range and its only said to be 350 at the flywheel.
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01-30-2017, 08:41 AM
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#3 | |
Drives: 2010 Camaro 454 LSX (SOLD) Join Date: Jun 2013
Location: Dearborn Heights, MI
Posts: 792
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01-30-2017, 08:43 AM
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#4 |
Drives: 2015 camaro 2lt Join Date: Dec 2016
Location: Northern West Virginia
Posts: 925
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i thought 465 seems a bit low, more 470-475 seems right but thats just me.
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Cosmetic mods: SS hood with painted vent, SS bumper, acs 1le front lip black, big worm gfx tinted all lights, solar wing v2, Camaro seat belt pads and oracle color shift halos and fog light halos and rear colorshift bow tie, carbon creations carbon fiber stingray z spoiler
Wheels: lexani r-3 bg finish 19x8.5 Performance: cold air inductions intake, mrt v1, jacfab ported intake manifold, intake manifold spacer, overkill tuned on E85. |
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01-30-2017, 08:51 AM
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#5 |
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Drives: 15 Z28, 01 Corvette, 96 Corvette Join Date: Dec 2016
Location: Colorado
Posts: 863
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It should only be 430hp at the standard estimate of 15%. So 465 is a bit high but in the typical range of under reporting.
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01-30-2017, 08:58 AM
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#6 | |
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C'mon- really?
Drives: Looking for a ZL1 Join Date: Aug 2009
Location: Nortwestern Ohio
Posts: 1,966
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Quote:
That's a lot of underestimation but I will take it! No wonder the car feels so stout.
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Steve
2018 Camaro 2SS 1LE Black #3805 - SOLD |
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01-30-2017, 12:04 PM
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#7 |
 
Drives: 2015 Z/28 Silver #713 Join Date: Feb 2016
Location: Gilbert AZ
Posts: 151
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469/437 -Motor trend on K&N's Dynojet:
http://st.motortrend.com/uploads/sit...T350R-dyno.jpg |
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01-30-2017, 12:08 PM
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#8 | |
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Drives: 15 Z28, 01 Corvette, 96 Corvette Join Date: Dec 2016
Location: Colorado
Posts: 863
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Quote:
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2018 Sierra RCSB | 2015 Z28 Camaro | 1989 B2200 with a 327 | 1996 LT4 Z51 Corvette | 1973 427 Nova
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01-30-2017, 12:15 PM
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#9 |
       
Drives: 20 X3M CP & 19 ZL1 1LE A10 Join Date: Jun 2013
Location: Brenham, TX
Posts: 3,517
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CCBS, Trofeos, gearing have something to do with it for sure. Especially the 1st /.
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🔺22 RS E TRON GT
🔺21 Model S Plaid |
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01-30-2017, 12:57 PM
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#10 | |
Drives: 2015 Z/28 #397 2022 ZL1 #1799 Join Date: Jul 2009
Location: DC
Posts: 521
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01-30-2017, 07:55 PM
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#11 |
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Drives: 2015 Summit White Z/28 #97 Join Date: Jul 2013
Location: Austin, TX
Posts: 116
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My car (stock) runs side-by-side with 475whp 5th gens...
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01-31-2017, 05:36 AM
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#12 |
Drives: 2015 Camaro Z28/2016 Jeep Sahara Join Date: Mar 2010
Location: South Florida
Posts: 544
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I think my car dyno'd at 455-460 RWHP, and the simple add of headers and a tune brought it up to 493 RWHP...what an improvement! But in the end, it still wasn't enough power coming from a modded ZL1.
She's the perfect balance of power and handling now! Anyone considering Heads/cam/intake/throttle body upgrades should go ahead and do it! The car is a total animal, but not over the top! I can hang with the likes of Audi R8's and other exotics with my new engine build!
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2015 summit white Z28 #120 TRK DAY
-Sun-Tek PPF-C protection film on 2/3 of the car, Moreno Camber plates, American Racing 2" ceramic coated LT headers and X-pipes with No Cats, Taylor red performance wires, NGK plugs, BTR Stage III Cam, MSD Atomic intake, Nick Williams 102mm throttle body, Stage 2 CNC Ported Heads by WCCH, MGW short throw shifter, oil catch can, and a dyno tune to get me to 587 RWHP and 516 RWTQ GONE: 2013 Summit White Camaro ZL1 M6 Roto-Fab CAI, Kooks headers and CAT delete, ATI damper and 10% pulley and balancer! Results: 576 RWHP - 540 RWTQ |
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01-31-2017, 07:25 AM
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#13 |
 
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,815
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I think my factory LS7 was a little weak as the replacement that I recently installed feels much better. I have no #s to confirm this but SOTP.
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold) |
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02-01-2017, 11:24 PM
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#14 |
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Raging Bull Reborn
Drives: '09 CGM Z063LZ '15 RH Z/28 #0631 Join Date: Mar 2012
Location: Broken Arrow OK
Posts: 765
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Not too strange really. Our Z's come with a K/N performance CAI. On my '09 Z09 a CAI from Halltech is good for 32 hp, when combined with a dyno tune C6Z06 LS7 = 505 + CAI...537hp. I woudnt be surprized if the car wasn't underrated, as I've seen it compared to the 69 aluminum ZL1 engine, which was also grossly underrated.
Combine some level of under-rating, and an agressive 91 octane tune that uses the CAI to best effect. Evidence fo this? The C6Z06 was rated at 505HP...without a snap crackle pop tune, or a CAI. The addition of the performance intake could easily give the HP rating a bump...along with an additional HP bump from an underrated LS7.
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 Toy 1 '15 RH Z/28 w/AC & Radio S/N 0631 Toy 2 '09 CGM Z06 3LZ My DD: '17 Ford Mustang GT Her DD: '14 F150 Ecoboost 3.5 |
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