All these mods and only 1 HP gain? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

musclecargirl · 09-07-2011, 09:53 PM

First, some background:

Two years ago, had my STOCK car (L99) dyno-ed.
Temp was in low 80s, humidity was 4%.

Two weeks ago, had my modified car TUNED (engine and transmision) and dyno-ed. Dyno shows I gained 1 HP and 15 ft. lbs torque.
Mods include:
- After market intake.
- Shorty headers.
- Highflow Cats.
- Catback exhaust.
Temp was low 90s and humidity was approx. 40%.

Real happy about the increase in torque. A little surprised by the HP results.

The shop attributed the lack of HP gains on the dyno to the temp and humidity. They suggested I bring the car back when the temps are lower and the humidity is lower for another dyno (which I plan to do).

I'm sharing this for a couple of reasons:
- I don't have the knowledge to either agree or disagree with the explanation provided for the HP dyno results. I'll know for sure when I take it back in about 2 months.
- Let others who might be considering mods/tune know to be careful about setting realistic expectations of what those mods/tune will get you (if you're expecting HP gains).

I'm happy with the mods and the tune. The car finally sounds like I want it to and the AFM is gone! Haven't driven it enough yet to know if there's any noticable impact on gas mileage.

If you've had a similar or different experience, I'd be interested to hear about it.

Rhino79 · 09-07-2011, 09:55 PM

The power gains seem low to me. What were the final numbers, I'd say you should be around 340-350ish at least.

SUX2BU · 09-07-2011, 09:56 PM

Were these at the same dyno?

formare · 09-07-2011, 09:56 PM

Was the dyno runs (all of them) done at the same shop?

musclecargirl · 09-07-2011, 09:57 PM

Good questions. I knew I'd leave something out.

Dynos were done at the same shop on the same machine.
HP two years ago (with stock car) was 347.
HP now is 348.

stso634 · 09-07-2011, 10:02 PM

Higher temperature and humidity are definitely knocking down your numbers. Don't worry so much about the dyno numbers. Take it to the track and see how it performs under real racing conditions.

musclecargirl · 09-07-2011, 10:05 PM

Excellent suggestion. Can't wait till the next local Test/Tune. Really hoping to notice the increase in torque.

I'll post an update as soon as I have some results. I do have some track numbers/experience to compare it to so will be interesting.

ParisTNDude · 09-07-2011, 10:05 PM

I'm convinced temperature and humidty has a huge difference in dyno HP and Torque figures. I would really like to see your numbers in 70 degree weather. I would bet on a considerable improvment. Do you drag race, if so, before and after track times really tell the story.

Rhino79 · 09-07-2011, 10:06 PM

Numbers sound about right then with good weather. Your car dyno'd well in stock trim, I agree with STSO, run it at the track see whats up with it.

SUX2BU · 09-07-2011, 10:09 PM

Good dynos should account for weather changes. What kind of dyno was it?

musclecargirl · 09-07-2011, 10:19 PM

Quote:

Originally Posted by SUX2BU

Good dynos should account for weather changes. What kind of dyno was it?

Hope I got this right. First dyno was STD second was SAE.

siriusdish · 09-07-2011, 10:23 PM

Quote:

Originally Posted by musclecargirl

Hope I got this right. First dyno was STD second was SAE.

Dyno jet? Mustang? ???

musclecargirl · 09-07-2011, 10:23 PM

Quote:

Originally Posted by siriusdish

Dyno jet? Mustang? ???

Dyno jet

siriusdish · 09-07-2011, 10:24 PM

Quote:

Originally Posted by musclecargirl

Dyno jet

Sweet

09-07-2011, 09:53 PM	#1
musclecargirl Drives: 2010 2SS CGM w/IO Interior Join Date: Jun 2009 Location: Fayetteville, GA Posts: 290	All these mods and only 1 HP gain? First, some background: Two years ago, had my STOCK car (L99) dyno-ed. Temp was in low 80s, humidity was 4%. Two weeks ago, had my modified car TUNED (engine and transmision) and dyno-ed. Dyno shows I gained 1 HP and 15 ft. lbs torque. Mods include: - After market intake. - Shorty headers. - Highflow Cats. - Catback exhaust. Temp was low 90s and humidity was approx. 40%. Real happy about the increase in torque. A little surprised by the HP results. The shop attributed the lack of HP gains on the dyno to the temp and humidity. They suggested I bring the car back when the temps are lower and the humidity is lower for another dyno (which I plan to do). I'm sharing this for a couple of reasons: - I don't have the knowledge to either agree or disagree with the explanation provided for the HP dyno results. I'll know for sure when I take it back in about 2 months. - Let others who might be considering mods/tune know to be careful about setting realistic expectations of what those mods/tune will get you (if you're expecting HP gains). I'm happy with the mods and the tune. The car finally sounds like I want it to and the AFM is gone! Haven't driven it enough yet to know if there's any noticable impact on gas mileage. If you've had a similar or different experience, I'd be interested to hear about it.

09-07-2011, 09:56 PM	#3
SUX2BU Quit being a pu$$y Drives: FAST Join Date: Jan 2011 Location: Sachse TX (DFW) Posts: 5,825 View My Garage	Were these at the same dyno? __________________ <----- Click HERE to see ALL of my mods/write ups

09-07-2011, 09:56 PM	#4
formare The Milano Drives: 2017 Firefly ShipWorks Join Date: Jun 2010 Location: Chicagoland (Crown Point, IN) Posts: 1,877 View My Garage	Was the dyno runs (all of them) done at the same shop? __________________ My first Love. She was called "Miss Carriage" (still cry when I think about her) 383, Muncie 4 speed, custom linkage mated to hurst short throw shifter.

09-07-2011, 10:05 PM	#8
ParisTNDude Owning SSes for 50 Years Drives: Sharkskin Grey LT1 Join Date: Apr 2010 Location: Paris, TN Posts: 3,139 View My Garage	Temps/Humidity Big Difference I'm convinced temperature and humidty has a huge difference in dyno HP and Torque figures. I would really like to see your numbers in 70 degree weather. I would bet on a considerable improvment. Do you drag race, if so, before and after track times really tell the story. __________________ The new ride: 2023 Camaro, LT1, Sharkskin Grey Previous Performance Cars: 1966 Chevelle SS 4M, 2010 Corvette 6M 1968 Dodge Charger R/T Auto 2012 1SS 6M 1982 Corvette Auto 2010 1SS 6A 1984 Corvette Auto 2016 2SS 8A 1999 Camaro Auto 2017 HBM 1SS 1le 2002 C5 Corvette 6M 2018 2SS 2006 Corvette Auto 2023 Camaro LT1

09-07-2011, 10:09 PM	#10
SUX2BU Quit being a pu$$y Drives: FAST Join Date: Jan 2011 Location: Sachse TX (DFW) Posts: 5,825 View My Garage	Good dynos should account for weather changes. What kind of dyno was it? __________________ <----- Click HERE to see ALL of my mods/write ups

09-07-2011, 09:55 PM	#2
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	The power gains seem low to me. What were the final numbers, I'd say you should be around 340-350ish at least.

09-07-2011, 09:57 PM	#5
musclecargirl Drives: 2010 2SS CGM w/IO Interior Join Date: Jun 2009 Location: Fayetteville, GA Posts: 290	Good questions. I knew I'd leave something out. Dynos were done at the same shop on the same machine. HP two years ago (with stock car) was 347. HP now is 348.

09-07-2011, 10:02 PM	#6
stso634 Drives: 2010 Camaro 2SS/RS Join Date: Feb 2011 Location: Shreveport, LA Posts: 379 View My Garage	Higher temperature and humidity are definitely knocking down your numbers. Don't worry so much about the dyno numbers. Take it to the track and see how it performs under real racing conditions.

09-07-2011, 10:06 PM	#9
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	Numbers sound about right then with good weather. Your car dyno'd well in stock trim, I agree with STSO, run it at the track see whats up with it.