Dyno error? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Rem0v3r · 09-23-2018, 09:09 AM

I'm trying to find some reason or logic for what happened the other night so hopefully someone can shed some light..

I went to a car show where they had a mobile dynojet dyno.. my car is an l99 twin rear mount turbo.. 4400lb vert pushing 7psi of boost at 11.0 ish afr around 14 degrees final timing.. the car has never been on a dyno

I destroy the newer corvettes all day long, it's not even close..

They said 385rwhp... to me that doesn't make sense.
What are the options here?

gm2376 · 09-23-2018, 09:17 AM

Quote:

Originally Posted by Rem0v3r

I'm trying to find some reason or logic for what happened the other night so hopefully someone can shed some light..

I went to a car show where they had a mobile dynojet dyno.. my car is an l99 twin rear mount turbo.. 4400lb vert pushing 7psi of boost at 11.0 ish afr around 14 degrees final timing.. the car has never been on a dyno

I destroy the newer corvettes all day long, it's not even close..

They said 385rwhp... to me that doesn't make sense.
What are the options here?

means the dyno is off.

spadz93 · 09-23-2018, 10:05 AM

way off

HDRDTD · 09-23-2018, 11:32 AM

What were other cars measuring at? Were they way off as well ??

Did the dyno chart have a reasonable looking curve shape for both HP and Tq ?

Rem0v3r · 09-23-2018, 12:08 PM

I didn't stick around.. I was the first car up there, after that I left to go cry in my beer haha.. they're supposed to be emailing the results to me.. I'll post when I get them.

Rem0v3r · 09-23-2018, 12:08 PM

They did tell me they were only measuring horsepower.. not sure how it all works

HDRDTD · 09-23-2018, 02:49 PM

Does it matter what gear the car was in? If so, perhaps they made a mistake and it was in the wrong gear?

Perhaps they discovered a mistake with your run afterwards and corrected it for the rest of the runs?

Maybe they made a mistake and the results they gave you were for the last car that had run on the dyno the last time they used it.

Regardless, if they told you the results then and there, I'd ask for another run to verify the results. Most dyno runs include two runs back to back. Then they report the better of the two.

Rem0v3r · 09-23-2018, 04:37 PM

I paid for 2 runs, I ran 4 back to back.. they wanted me to do a 5th but I didn't want to beat the shit out of my car... the numbers were not changing and I didn't want to flog a dead horse.

13SSCamaro · 09-23-2018, 05:43 PM

Were your tires spinning on the dyno?

*SSE 4 2SS* · 09-23-2018, 05:45 PM

Were you operating the car..... to what RPM did you make your pulls....and in what gear... Rear mount, (trunk area) turbos take a while to spool, and if you shut down early then you might not have ever gotten into the sweet spot....

or....

Their junk was off....Them having 4 pulls performed and wanting a 5th tells me their junk was not calibrated....

*SSE 4 2SS* · 09-23-2018, 06:10 PM

Ok...

So, (RPMxTorque) / 5252 =HP

You gave us a HP of 385. Working this backwards and making some assumptions.... Here is your torque...

HP x 5252 / RPM = Torque
385 x 5252 / 4000 = T
2022020 / 4000 = 505

2022020 / 4500 = 449

2022020 / 5000 = 404

2022020 / 5500 = 367

2022020 / 6000 = 337

2022020 / 6500 = 311

Without a dyno printout or screenshot showing actual references this is a best guess. With MPH and max torque on a graph, it could be worked out provided your trans and diff gears are factory, or these are known numbers....

My best guess is their stuff wasn't working correctly.... I say this because with rear mount turbos, you won't make max torque at 4000 rpm.... I'm thinking your max torque would be in the 5000 - 5500 rpm range, but I might be very wrong.... We need more information...

Having said all that, if you are smoking newer Vettes easily, their numbers were way off....

christianchevell · 09-25-2018, 07:35 AM

Yes your into a dyno that's worthless but for some stupid bragging rights well there you go; all HP numbers are figured off the torque and almost all dynojets are non load bearing so they usually if not made just right by the operator can inflate numbers. Every dyno has to have correction factors correlating the thing due to temperature humidity and elevation also and who knows what that was or what the sheet would have looked like …….and 11 AFR is really not so good.... Stoich being 14.7 most go rich to about 12.7ish for WOT.... how the numbers so messed up?????/ most likely a combination of crap....and 7 psi not much you don't mention what other mods.....

Rem0v3r · 09-25-2018, 03:32 PM

Twin turbo gt35s 1000c injectors zl1 fuel pump cats removed, stock everything else. 12.7 is rich for na, boosted apps need richer... running on 93 pump gas.

silversleeper · 09-25-2018, 11:25 PM

Quote:

Originally Posted by SSE 4 2SS

Ok...

So, (RPMxTorque) / 5252 =HP

You gave us a HP of 385. Working this backwards and making some assumptions.... Here is your torque...

HP x 5252 / RPM = Torque
385 x 5252 / 4000 = T
2022020 / 4000 = 505

2022020 / 4500 = 449

2022020 / 5000 = 404

2022020 / 5500 = 367

2022020 / 6000 = 337

2022020 / 6500 = 311

.

I was reading Hammdo's thread trying to figure out parts of my tune and you said you dislike math and here you go ! Did you stay at a Holiday Inn Express last night

09-23-2018, 09:09 AM	#1
Rem0v3r Drives: 2013 ss2 vert l99 Join Date: Apr 2017 Location: South florida Posts: 150	Dyno error? I'm trying to find some reason or logic for what happened the other night so hopefully someone can shed some light.. I went to a car show where they had a mobile dynojet dyno.. my car is an l99 twin rear mount turbo.. 4400lb vert pushing 7psi of boost at 11.0 ish afr around 14 degrees final timing.. the car has never been on a dyno I destroy the newer corvettes all day long, it's not even close.. They said 385rwhp... to me that doesn't make sense. What are the options here?

09-23-2018, 10:05 AM	#3
spadz93 BUMBL Z Drives: 2015 ZL1 Join Date: Nov 2013 Location: Northern NJ Posts: 2,573 View My Garage	way off __________________ Current: 2015 ZL1 M6, Rotofab Intake, LS3 throttle body, 2.55 Upper/9.17 Lower w/ Idler Relocation, DMS Reinforced Brick, ID1050X, 1 7/8" Headers, ProSpeed HX/Reservoir, DSX Aux Pump/Flex Fuel Sensor, E85, McLeod RXT, BMR 1" Drop, Tuned by Pat G Past: 2010 2SS, some bolt ons, 415rwhp/400rwtq

09-23-2018, 05:43 PM	#9
13SSCamaro Drives: 2013 Camaro SS Join Date: Apr 2017 Location: South Florida Posts: 254	Were your tires spinning on the dyno? __________________ 2013 SS M6, TSP Stage 3 231/246 cam kit, TSP Trunion upgrade, Cold Air Inductions CAI, VMAX PTB, TSP 1 7/8 Long tube headers and high flow cats, Corsa Xtreme ZL1 Catback exhaust, Elite E2-X Catch can, Trick Flow Gen-X 255 heads milled 0.025 and valve job, GPI rod mod and ported intake, ID850 injectors,ZL1 fuel pump, Flex sensor and E-85, Mantic 9000 and 1LE 3.91 diff 512rwhp/462rwtq

09-23-2018, 05:45 PM	#10
SSE 4 2SS Boosted Moderator Drives: Bone Stock LS3 Join Date: Sep 2009 Location: Marion Tx Posts: 15,469	Were you operating the car..... to what RPM did you make your pulls....and in what gear... Rear mount, (trunk area) turbos take a while to spool, and if you shut down early then you might not have ever gotten into the sweet spot.... or.... Their junk was off....Them having 4 pulls performed and wanting a 5th tells me their junk was not calibrated.... __________________ If the car feels like it is on rails, you are probably driving too slow. -Ross Bentley Horsepower is how fast you hit the wall. Torque is how far you take the wall with you. “If everything seems under control, you're just not going fast enough.” Mario Andretti If you can turn, you ain't going fast enough...

09-23-2018, 06:10 PM	#11
SSE 4 2SS Boosted Moderator Drives: Bone Stock LS3 Join Date: Sep 2009 Location: Marion Tx Posts: 15,469	Ok... So, (RPMxTorque) / 5252 =HP You gave us a HP of 385. Working this backwards and making some assumptions.... Here is your torque... HP x 5252 / RPM = Torque 385 x 5252 / 4000 = T 2022020 / 4000 = 505 2022020 / 4500 = 449 2022020 / 5000 = 404 2022020 / 5500 = 367 2022020 / 6000 = 337 2022020 / 6500 = 311 Without a dyno printout or screenshot showing actual references this is a best guess. With MPH and max torque on a graph, it could be worked out provided your trans and diff gears are factory, or these are known numbers.... My best guess is their stuff wasn't working correctly.... I say this because with rear mount turbos, you won't make max torque at 4000 rpm.... I'm thinking your max torque would be in the 5000 - 5500 rpm range, but I might be very wrong.... We need more information... Having said all that, if you are smoking newer Vettes easily, their numbers were way off.... __________________ If the car feels like it is on rails, you are probably driving too slow. -Ross Bentley Horsepower is how fast you hit the wall. Torque is how far you take the wall with you. “If everything seems under control, you're just not going fast enough.” Mario Andretti If you can turn, you ain't going fast enough...

09-23-2018, 11:32 AM	#4
HDRDTD Drives: 2013 Triple Black ZL1 Vert M6 ECF Join Date: Mar 2011 Location: Trenton, Michigan Posts: 7,047	What were other cars measuring at? Were they way off as well ?? Did the dyno chart have a reasonable looking curve shape for both HP and Tq ?

09-23-2018, 12:08 PM	#5
Rem0v3r Drives: 2013 ss2 vert l99 Join Date: Apr 2017 Location: South florida Posts: 150	I didn't stick around.. I was the first car up there, after that I left to go cry in my beer haha.. they're supposed to be emailing the results to me.. I'll post when I get them.

09-23-2018, 02:49 PM	#7
HDRDTD Drives: 2013 Triple Black ZL1 Vert M6 ECF Join Date: Mar 2011 Location: Trenton, Michigan Posts: 7,047	Does it matter what gear the car was in? If so, perhaps they made a mistake and it was in the wrong gear? Perhaps they discovered a mistake with your run afterwards and corrected it for the rest of the runs? Maybe they made a mistake and the results they gave you were for the last car that had run on the dyno the last time they used it. Regardless, if they told you the results then and there, I'd ask for another run to verify the results. Most dyno runs include two runs back to back. Then they report the better of the two.

09-23-2018, 04:37 PM	#8
Rem0v3r Drives: 2013 ss2 vert l99 Join Date: Apr 2017 Location: South florida Posts: 150	I paid for 2 runs, I ran 4 back to back.. they wanted me to do a 5th but I didn't want to beat the shit out of my car... the numbers were not changing and I didn't want to flog a dead horse.

09-25-2018, 07:35 AM	#12
christianchevell old school chevy rodder Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012 Location: Oregon Posts: 5,588 View My Garage	Yes your into a dyno that's worthless but for some stupid bragging rights well there you go; all HP numbers are figured off the torque and almost all dynojets are non load bearing so they usually if not made just right by the operator can inflate numbers. Every dyno has to have correction factors correlating the thing due to temperature humidity and elevation also and who knows what that was or what the sheet would have looked like …….and 11 AFR is really not so good.... Stoich being 14.7 most go rich to about 12.7ish for WOT.... how the numbers so messed up?????/ most likely a combination of crap....and 7 psi not much you don't mention what other mods..... __________________ 2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop

09-25-2018, 03:32 PM	#13
Rem0v3r Drives: 2013 ss2 vert l99 Join Date: Apr 2017 Location: South florida Posts: 150	Twin turbo gt35s 1000c injectors zl1 fuel pump cats removed, stock everything else. 12.7 is rich for na, boosted apps need richer... running on 93 pump gas.