09-23-2018, 09:09 AM | #1 |
Drives: 2013 ss2 vert l99 Join Date: Apr 2017
Location: South florida
Posts: 150
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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, 09:17 AM | #2 | |
Drives: 2010 Black 2ss Camaro SS Join Date: May 2010
Location: Rochester Hills, MI
Posts: 1,062
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Quote:
means the dyno is off.
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09-23-2018, 10:05 AM | #3 |
BUMBL Z
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way off
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Past: 2010 2SS, some bolt ons, 415rwhp/400rwtq |
09-23-2018, 11:32 AM | #4 |
Drives: 2013 Triple Black ZL1 Vert M6 ECF Join Date: Mar 2011
Location: Trenton, Michigan
Posts: 7,047
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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 |
Drives: 2013 ss2 vert l99 Join Date: Apr 2017
Location: South florida
Posts: 150
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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.
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09-23-2018, 12:08 PM | #6 |
Drives: 2013 ss2 vert l99 Join Date: Apr 2017
Location: South florida
Posts: 150
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They did tell me they were only measuring horsepower.. not sure how it all works
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09-23-2018, 02:49 PM | #7 |
Drives: 2013 Triple Black ZL1 Vert M6 ECF Join Date: Mar 2011
Location: Trenton, Michigan
Posts: 7,047
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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 |
Drives: 2013 ss2 vert l99 Join Date: Apr 2017
Location: South florida
Posts: 150
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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.
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09-23-2018, 05:43 PM | #9 |
Drives: 2013 Camaro SS Join Date: Apr 2017
Location: South Florida
Posts: 254
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Were your tires spinning on the dyno?
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09-23-2018, 05:45 PM | #10 |
Boosted Moderator
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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....
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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 |
Boosted Moderator
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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....
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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... |
09-25-2018, 07:35 AM | #12 |
old school chevy rodder
Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012
Location: Oregon
Posts: 5,587
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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.....
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09-25-2018, 03:32 PM | #13 |
Drives: 2013 ss2 vert l99 Join Date: Apr 2017
Location: South florida
Posts: 150
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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.
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09-25-2018, 11:25 PM | #14 | |
Big Crow
Drives: '13 ZL1 Join Date: Mar 2017
Location: California
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