Made less hp H/C then cam only - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

FathoeSS · 01-15-2021, 06:58 AM

Ashen, I under stand it looks like I’m chasing a number but I just don’t understand that with heads and cam I thought I would have surpassed my last number.

Ashen 6.2 · 01-15-2021, 07:24 AM

How do the numbers below 5k RPM's look? Are they much different than before?

Pearlj10 · 01-15-2021, 08:49 AM

I second Ashen 6.2. Did you pick up HP and torque gains in lower rpms? Don’t just look at the max numbers, look at any possible changes throughout the spectrum, too. I’d be curious if your new h/c setup is making better numbers in the mid rpms.

joshnmn · 01-15-2021, 09:58 AM

Honestly I don’t see how you made the number you did without heads. That’s the number I would suspect. The latest one with heads is closer to what I would expect.

Tarendor · 01-15-2021, 10:26 AM

You need to upgrade the headers.
You upgraded the heads (more flow) and changed cam but now your trying to push it through the same size hole.

Thats what I would put my money on.

bayarea408 · 01-15-2021, 02:30 PM

2" primaries and dont look back

Badbubba · 01-15-2021, 08:49 PM

Both sessions on e. Headers should flow enough to make same hp. Could the new 3.91 gears make a difference? If they were installed for the tune.

Warship2k15 · 01-16-2021, 01:44 PM

Step up to 1 7/8 or 2” headers.
No matter how much people want to talk theory and 1 3/4 are enough the dyno tells a different story.The 1 7/8 and two inch both make more hp on a stock car with a cold air intake.So it will hinder a cammed car even more.
You have a cam that will run up past 7000 and headers that crap out at a much lower rpms.

JMI · 01-16-2021, 03:13 PM

If you changed the gearing and or wheel or tire size(different weight). It will change the dyno numbers.
We've seen as much as 20rwhp if you play with the air pressure in the tires and diff oil temperature.Sometimes 2-3 dyno pulls needs to be done to stabilize the numbers,before doing changes.

Badbubba · 01-17-2021, 12:12 AM

With the CNC'd heads, did they touch the chambers, mill the surface or anything different with the valves, springs, etc? What about the head gasket, stock? The afr, timing, plugs?

Dbunch9 · 01-17-2021, 07:25 PM

I dynod my gpi head/ss3 cam car when I finished the build and got 451/415. 2 years later I dynod the car again for fun but I had a 3.91 gears and a different shops dyno and the numbers were 475/464. Gears definitely skewed the dyno results for me even tho it was a different dyno (both dyno jets, just different shops).

InFiD3ViL · 01-19-2021, 09:16 PM

Quote:

Originally Posted by Dbunch9

I dynod my gpi head/ss3 cam car when I finished the build and got 451/415. 2 years later I dynod the car again for fun but I had a 3.91 gears and a different shops dyno and the numbers were 475/464. Gears definitely skewed the dyno results for me even tho it was a different dyno (both dyno jets, just different shops).

Dang, I'd say. That first number seemed awfully low, even for an auto H/C car. That difference in TQ though, wow.

TheFlyingBananaSS · 01-20-2021, 07:41 AM

Same tire height? Those 3.91 gears will change your numbers with different tire setups. I agree with everyone above about the header restrictions.

FathoeSS · 01-28-2021, 06:34 PM

Wanted to say thanks to everyone I guess I’ll pull the trigger on new long tubes and retune. I’ll keep everyone posted once the long tubes are in.

01-15-2021, 07:24 AM	#16
Ashen 6.2 Drives: 2014 Camaro Z/SS Join Date: May 2014 Location: NW Arkansas Posts: 1,996 View My Garage	How do the numbers below 5k RPM's look? Are they much different than before? __________________ 2014 Camaro SS L99, Ashen Grey w/Black Leather - Build thread - http://www.camaro5.com/forums/showthread.php?t=491561 Mods - GPI 416 w/Custom Grind Cam, Ported Heads & Tuned by Ben, Holley Dominator ECU, Mag Heartbeat, ZL1 Fuel Pump & DSX Aux Pump, NW 103 TB, FIC 1650's, Alky Meth, Circle D 3600 Triple Disc, Kooks Headers, Viking Coil Overs & all the BMR Goodies in the rear, Zl1 3.23 Diff, DSS Axles, Gulfcoast Driveshaft, Hendrix Offset Diff Bushings, AFE Solid Subframe Bushings, 875HP/843TQ 5FDP

01-15-2021, 10:26 AM	#19
Tarendor Drives: 2012 camaro 2ss rs L99 Join Date: Feb 2017 Location: North Sioux city SD Posts: 446 View My Garage	You need to upgrade the headers. You upgraded the heads (more flow) and changed cam but now your trying to push it through the same size hole. Thats what I would put my money on. __________________ 2012 2SS/RS, L99, no cats/mufflers, Ported intake manifold, fuel rail upgrade, ID1050x injectors, Vmax throttle body, 25% UDP, GPI DOD delete, GPI SS3, GPI cnc heads, GPI – 5/16″ Hardened Pushrods, BTR trunion upgrade, BTR .660 springs, pcv revamp w/dual catch cans, Circle D 3800, full BMR suspension & bushings. ZL1 fuel pump, HPT programmed fpcm. JMS bap, Snow VC-50 methanol setup. custom 4gal methonal tank, vs7875 turbo, FMIC, precision 46mm WG, 50mm BOV, 3bar map, SJM line lock, Innovate SCG-1, Hurst shifter with tap shift mod, ×2 Holley 14" fans Diy E85, Diy auxiliary pump

01-15-2021, 08:49 PM	#21
Badbubba GrINned & JUICEd Drives: 15STI, 10Expy, 10 2SS/RS M6, 47KB1 Join Date: Nov 2009 Location: Pittsburgh, PA Posts: 1,247	Both sessions on e. Headers should flow enough to make same hp. Could the new 3.91 gears make a difference? If they were installed for the tune. __________________ GPI SS3 Cam & stuff,N.O. Plate(dedicated fuel tank,progressive,fuel hose upgrade,remote opener,heater,console switches),LNC2000,CTAP,ARH 1 7/8" LTs/gutted cats/X pipe/mufflers,Jet Hot coated LTs,GPI HPT Tune,CAI, Scoop,Rx Catch Can,Gates heater hose relocation, Remote clutch & auto brake res,Metco loop,Momentum Tunnel Brace,TSW Nurb 18",555 & 05,Pfadt trailing arms & toe rods,Autometer WB,Fesler Pillar Pod,LED strips (int),Lloyds floor & trunk mats,LED DRL/front turn & license plate,DRL harness,VLEDs tail lights,Plasticoat Bowties. Ord: Oct 5, 2009 Rec: Nov 19, 2009 13.17@112.6 stock Last edited by Badbubba; 02-22-2021 at 02:30 PM.

01-16-2021, 03:13 PM	#23
JMI Drives: Red Jewel Camaro SS Join Date: Mar 2014 Location: East Coast Posts: 392	If you changed the gearing and or wheel or tire size(different weight). It will change the dyno numbers. We've seen as much as 20rwhp if you play with the air pressure in the tires and diff oil temperature.Sometimes 2-3 dyno pulls needs to be done to stabilize the numbers,before doing changes. __________________ BTR LSX388,AGP Twin Turbo.6L90,GM 9.9" Diff.Fore Innovations Level 4 fuel system.Great fuel economy !!!! 1xxx RWHP

01-17-2021, 12:12 AM	#24
Badbubba GrINned & JUICEd Drives: 15STI, 10Expy, 10 2SS/RS M6, 47KB1 Join Date: Nov 2009 Location: Pittsburgh, PA Posts: 1,247	With the CNC'd heads, did they touch the chambers, mill the surface or anything different with the valves, springs, etc? What about the head gasket, stock? The afr, timing, plugs? __________________ GPI SS3 Cam & stuff,N.O. Plate(dedicated fuel tank,progressive,fuel hose upgrade,remote opener,heater,console switches),LNC2000,CTAP,ARH 1 7/8" LTs/gutted cats/X pipe/mufflers,Jet Hot coated LTs,GPI HPT Tune,CAI, Scoop,Rx Catch Can,Gates heater hose relocation, Remote clutch & auto brake res,Metco loop,Momentum Tunnel Brace,TSW Nurb 18",555 & 05,Pfadt trailing arms & toe rods,Autometer WB,Fesler Pillar Pod,LED strips (int),Lloyds floor & trunk mats,LED DRL/front turn & license plate,DRL harness,VLEDs tail lights,Plasticoat Bowties. Ord: Oct 5, 2009 Rec: Nov 19, 2009 13.17@112.6 stock Last edited by Badbubba; 03-24-2021 at 12:51 AM.

01-15-2021, 06:58 AM	#15
FathoeSS Drives: Chevrolet Camaro SS Join Date: Jan 2021 Location: Miami Posts: 9 View My Garage	Ashen, I under stand it looks like I’m chasing a number but I just don’t understand that with heads and cam I thought I would have surpassed my last number.

01-15-2021, 08:49 AM	#17
Pearlj10 Drives: 2011 Camaro 2LT Join Date: Oct 2018 Location: Az Posts: 367	I second Ashen 6.2. Did you pick up HP and torque gains in lower rpms? Don’t just look at the max numbers, look at any possible changes throughout the spectrum, too. I’d be curious if your new h/c setup is making better numbers in the mid rpms.

01-15-2021, 09:58 AM	#18
joshnmn 2&THEHIT Drives: 5th Gen Camaro; 5th Gen Ram 3500 Join Date: Mar 2018 Location: Garner, NC Posts: 1,013 View My Garage	Honestly I don’t see how you made the number you did without heads. That’s the number I would suspect. The latest one with heads is closer to what I would expect.

01-15-2021, 02:30 PM	#20
bayarea408 Drives: T Join Date: Mar 2015 Location: CA Posts: 803	2" primaries and dont look back

01-16-2021, 01:44 PM	#22
Warship2k15 Drives: 2010 Camaro 2SS Join Date: May 2016 Location: Kissimmee Posts: 158	Step up to 1 7/8 or 2” headers. No matter how much people want to talk theory and 1 3/4 are enough the dyno tells a different story.The 1 7/8 and two inch both make more hp on a stock car with a cold air intake.So it will hinder a cammed car even more. You have a cam that will run up past 7000 and headers that crap out at a much lower rpms.

01-17-2021, 07:25 PM	#25
Dbunch9 Drives: 2010 Camaro 2SS Join Date: Aug 2016 Location: Orlando, FL Posts: 294	I dynod my gpi head/ss3 cam car when I finished the build and got 451/415. 2 years later I dynod the car again for fun but I had a 3.91 gears and a different shops dyno and the numbers were 475/464. Gears definitely skewed the dyno results for me even tho it was a different dyno (both dyno jets, just different shops).

01-20-2021, 07:41 AM	#27
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	Same tire height? Those 3.91 gears will change your numbers with different tire setups. I agree with everyone above about the header restrictions. __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.

01-28-2021, 06:34 PM	#28
FathoeSS Drives: Chevrolet Camaro SS Join Date: Jan 2021 Location: Miami Posts: 9 View My Garage	Thanks Wanted to say thanks to everyone I guess I’ll pull the trigger on new long tubes and retune. I’ll keep everyone posted once the long tubes are in.