11-14-2011, 11:38 AM | #113 |
Drives: 16 Camaro SS, 15 Colorado Join Date: May 2009
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I agree that every car is different, even if you dyno'd two stock cars on the same dyno back to back there are going to be HP differences due to build tolerances and also due to how the car is setup on the dyno.
I won't even get into what weather, temps, and altitude can do to HP/TQ numbers as we all know it makes a HUGE difference. That said you pretty much never see a stock auto dyno over 250rwhp (and thats on the very high end), and assuming these cars are supposed to be making 312 crank HP, that means every one of the autos is losing 20% or more at the wheels. Manuals seem to be in the 16 - 17 % range. Thats how I tend to view it when I try and calc people's crank HP/TQ numbers based on their wheel numbers
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11-14-2011, 11:50 AM | #114 |
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It definitely make you wonder though if the GM's 312 crank number is overrated. It seem 250's will come by once in a while and 260's is almost like winning the lottery lol.
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11-14-2011, 12:22 PM | #115 | |
Drives: 16 Camaro SS, 15 Colorado Join Date: May 2009
Location: Jefferson City, Missouri
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When Chevy said the car actually makes 312 versus the original 304 it was cool because it was more than we thought, but also in my mind dissapointing because that meant the car was losing more power in the drivetrain than we originally thought lol. Oh wells. Nothing we can do besides take GM's word for it on this one.
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11-14-2011, 04:34 PM | #116 | |
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K&N Cai, BSR Ported intake, MBRP catback, BBK long tubes, VMax throttle body, 3.73 SS gears, Zex nitrous 125hp shot, window switch, purge,remote bottle opener, bottle heater, Trifecta tune, Hurst short throw, RX catch can, Intake isolator, Ported Intake manifold
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11-14-2011, 05:00 PM | #117 |
And now I'm starting to wonder if the computer was maybe still adjusting from the change. What do you think? I was more worried about getting the long tubes on the dyno, and i think I told you, that I had datalogged them, and Vince had told me I had a exhaust leak, from looking at the logs. So, I rewrenced all the bolts, and pulled the intake, before we put it on. I thought I had told you, but I don't remember the conversation. I might have been distracted by your car. I also wanted to help BSR(john) vindicate himself, alittle, if I could get it back on, and prove his work, but i just haven't had any time. He kinda got beat up alittle, and i wasn't digging that to much. So that will also be on, if i can get down there again.
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K&N Cai, BSR Ported intake, MBRP catback, BBK long tubes, VMax throttle body, 3.73 SS gears, Zex nitrous 125hp shot, window switch, purge,remote bottle opener, bottle heater, Trifecta tune, Hurst short throw, RX catch can, Intake isolator, Ported Intake manifold
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11-15-2011, 09:20 PM | #118 |
Mrs. Bunny to you
Drives: Not a Camaro Join Date: May 2009
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Airaid V2, MRT V2, BBK LTs w/ high flows, no tune. Only gained 10 hp and no torque. Weird? |
11-16-2011, 12:38 AM | #119 | |||
Drives: 2011 Camaro SS/ 2016 Camaro SS Join Date: Jun 2009
Location: Sandy, Utah
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Run 10 was a V6 with an Airaid, ARH LT's w/cats, Magnaflow axle-back and a Trifecta Tune. The tune didn't add a lot of HP (4 RWHP) but it did add (12 RWTQ) if I remember correctly.. That is interesting though... I haven't used the BBK headers so I don't have any good data there. Kind regards, Jordan Priestley 888.308.6007 |
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11-16-2011, 07:29 AM | #120 | |
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11-16-2011, 07:37 AM | #121 | |
Drives: Really Slow Join Date: Apr 2010
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11-16-2011, 07:41 AM | #122 | |
My Dream Car
Drives: 2011 SIM LS3 1SS Join Date: Jul 2009
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I think this engine needs time to learn as someone else had mentioned. After my 252 dyno I disconnected the battery, drove it for about a 100 miles light driving. After that I drove it real hard. Overall power seemed a better and more low end power. I have no dyno to prove this but when I first picked up the car it did not seem to pull as much or as hard as it does now especially down low. I only drive this car once a week so I can tell there is a difference. Just need to fig out where I am getting a vacuum leak as vince mentioned my fuel trims are whacked even at idle. Just can't seem to find it. but he def said its killing some of my power.
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CAI intake/ADM Scoop/Stainless Power Headers/Dynatech cat back exhaust/Vitesse Throttle Control/ Ported Throttle Body/QTP Electric Cutouts/ 3.91 gears and janetty rear posi/ Tuned by Janetty racing
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11-16-2011, 07:49 AM | #123 | |
Mrs. Bunny to you
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11-16-2011, 09:51 AM | #124 |
Bayou City Muscle Cars
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Yeah I know my first dyno after I got my tune tweaked put down about 249 hp /242 ft-lb (40% humidity) and a month later I put down 252 hp at the dyno day and that was with low humidity. So humidity and air density definitely make a big difference.
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11-16-2011, 10:07 AM | #125 |
Mrs. Bunny to you
Drives: Not a Camaro Join Date: May 2009
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11-16-2011, 10:19 AM | #126 |
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Bunny, now is that comparison graph from a completely stock car? I do know from my experience and from what I been seeing the dynojet 248x which ARD use seem to dyno a little lower then the smaller or newer dynojet models. 248x is consistent but they seem to dyno stock v6 camaros consistently lower then usual, between 230-240. Rolnslo and another member here also have dynoed at ARD and got a consistent stock number in the 230's, but what I don't get is the gain you got. I think you should have gotten way more then that unless there was some type of minor tweaking issue from the first time you was there to this latest time. Either way, the gain does seem very low if in fact the first graph is from a complete stock.
This is my dyno on the same 248x with long tube header but with no cats, full exhaust, vince's tune, and with factory intake. |
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