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I got my car on a DynoTech this morning and here are the results:
All three pulls were done with IATs starting at 108, topping out at 165. Not optimal I know, but it's a good representation of what the car sees on race day. (I'm lucky to have anything below 110 in the staging lanes).
Notice how the first two pulls trailed off and then had a little spike at the end, but the third was more "normal". Any ideas why? The dyno guy wasn't sure.
Mod list:
77mm SC pulley
82mm TB
Long Tube Headers w/cats
PLM H/X
Looped rail
ECU/TCU tunes by Mr. Lawshee
Those AITs are killing you. Max hp at 5k. There is 60+hp and .5 et left in there. You really need a dyno tune. I have seen that combo knock on the door of tens without the tb. But you should see you max hp close to 6k rpms. What was the air fuel ratio?
Looks a tad low my man. Impossible to say without AFR readings.
Can you be sure the sc belt isn't slipping?
What gear was the dyno operator in?
Are your plugs, wires, sensors relatively newish?
Boost?
Last edited by djempirE55; 04-13-2016 at 10:17 PM.
Plugs, wires, IAT & MAP sensors are all brand new. All pulls were done in 3rd gear; did not put the car in "dyno mode". The dyno operator had problems getting a clean RPM signal so I think he set it to calculate based off roller RPM or something like that. For whatever reason, the RPMs are off by about 200-300 RPM. (I sat in the passenger seat and watched him let off at about 6800 RPM, but that's not what the graphs show)
He also said his dyno is "stingy" and this would equate to about 500 hp on a DynoJet.
That is a friend of mines dyno. We were just on it a couple of weeks ago. It is a stingy guy.
You would have to have before and after on this one. There was a guy there that read 505 whp on this one and went across town and read 637 whp. At least that is what he said.
That is a friend of mines dyno. We were just on it a couple of weeks ago. It is a stingy guy.
You would have to have before and after on this one. There was a guy there that read 505 whp on this one and went across town and read 637 whp. At least that is what he said.
Yeah, he told me my car would show about 500 on a dynojet. That matches up with other stories I'm hearing of the DynoTech showing about 13% lower numbers than a DynoJet. It's just numbers anyway; the real purpose was to make sure I didn't need to tweak the tune before this weekend's event. Looking forward to getting some good times on Saturday at Woodburn.
Thanks for posting, Joe. Was expecting your AFR to dive when the power started dropping off at 5300 RPM, but looks good. I guess that would be around 5600 due to the poor RPM signal.
I'm working on a theory and wish you had an 84mm blower pulley to try at the track!
Not that hard to believe. This one is always in no corrections. The owner could care less about numbers. He just uses it to tune and then and goes to tune at the race track. But it is pretty standard to go 15% more on a dynojet and I would say that this dyno reads less than other dyno dynamics I have been on. It also has pretty bad air flow and gets hot and stuffy in there pretty quick.
We had a diesel I built on it and the whole room would go dark on a pull.
So you're the one who left all the soot in there! ;-) I heard stories about that diesel.
The DA forecast for Saturday shows Woodburn should be below 1000' all morning and into the afternoon. Temps in the low 70's should make for a pretty good day of racing.
Not that hard to believe. This one is always in no corrections. The owner could care less about numbers. He just uses it to tune and then and goes to tune at the race track. But it is pretty standard to go 15% more on a dynojet and I would say that this dyno reads less than other dyno dynamics I have been on. It also has pretty bad air flow and gets hot and stuffy in there pretty quick.
We had a diesel I built on it and the whole room would go dark on a pull.
I agree that a dyno is to be used as a tuning tool and real life performance is the ultimate test and proof. But over 20% variance... You said 15, which, maybe I could understand, but this is looking like 25% difference.
I find it interesting that on US forums, not just this one, that so much emphasis is placed on the type of dyno used. The run always has the caveat that I was on a mustang, or dd or what ever type.
I agree that a dyno is to be used as a tuning tool and real life performance is the ultimate test and proof. But over 20% variance... You said 15, which, maybe I could understand, but this is looking like 25% difference.
I find it interesting that on US forums, not just this one, that so much emphasis is placed on the type of dyno used. The run always has the caveat that I was on a mustang, or dd or what ever type.
25%? While I agree on a dynojet he should be around 510-15 on a heartbreaker he should be 460 or so. He is 433 add 25% and your talking 541 hp. Not going to happen without a monster pulley and max cooling if you ad 40-50 hp onto a heartbreaker your closer to a dyno jet if your in the 400 range.
Dynos are a PITA to compare. Your a/f ratio is good. Your track times are on par with a a car that would be in line with a 480hp car on a dyno jet. I'm thinking you should be in the low 11's. So dyno/track makes sense. There is more there somewhere.
25%? While I agree on a dynojet he should be around 510-15 on a heartbreaker he should be 460 or so. He is 433 add 25% and your talking 541 hp. Not going to happen without a monster pulley and max cooling if you ad 40-50 hp onto a heartbreaker your closer to a dyno jet if your in the 400 range.
I'm unsure if you are agreeing with me or not. My original comment was that one dyno showing 505 and another for the same car show 637 is over 25% different. Or ar you making another point?
I am not sandbagging Joe, if his car made 300 or 500hp it wouldn't matter as long as it looked good AFR and IAT wise. If he runs a mid 11 then the proof will be in the pudding. Not a dyno number.
Next step is to install a couple fans on the intercooler to try and drop my starting IATs by about 20 degrees. Hopefully that'll get me close to 11.50 e.t. and I'll call it good so I don't have to install a rollbar.
That just shows you dyno numbers mean squat, that is a nice slip. With better air and temps, along with getting your 60ft near 1.50, you are looking at 11.1-11.2 with your current setup.
Get a engine bay or trunk tank so you can ice it way down before your run. I mean get them around 40* and you will see these cars hunt.
04-13-2016, 08:22 PM
