Just hit the dyno last night and I figured some of you guys might be interested in the dyno results from my particular combo to help you with your own builds. The scanner at work lost the color but the top line is torque the next one is horsepower and the lowest one is the wideband oxygen sensor. You can see my engine is running pretty rich at idle, I'm gonnna fix it today. The guy also recommended from these results that I go down 2 jet sizes on the primaries. Oh and the 2 sets of results in this graph represent when the dyno guy knocked down my initial timing a few degrees and gained about 10 horses. Definately gonna play with timing some more.
So anyway the bottom line, before drivetrain losses he estimates 246 FWHP. Which is in the range I expected it to be in. And it looks like I can gain a few more horses with these results as a guide.
what car is this on?
also, not to bash you or anything... but how do you have 246 at the wheels... before drivetrain loss? you have to go throught the drivetrain to get to the wheels... unless you meant crank horse.
Well by FWHP I meant Flywheel Horsepower. Maybe I got my lingo wrong..
lol. alright. i've just been surrounded by too many hondas lately.
funny, thats the same excuse you used last time:
wierdo - graph looks nice. i bet that is enough to surprise a few people with the car pictured in your sig! :burnout:
Lol. Well maybe when the body work is done and the paint is waxed and shiny people will start to suspect something. But I subscribe to the less is more philosophy so it'll always be a sleeper :D
160 at the wheels and they think 246 at the engine? and 86 horsepower loss through the drivetrain? i make 150 at the wheels, and i figured i made about 180 at the engine? and i thought that was a good guess:dunno:
p.s. looks like i need to make 15 horses fast, i cant be making 10 less then you ;)
Yeah I'd wondered about that too but it occurred to me after that I don't know what gear he did this in. He wanted to do the run in second because he was worried about wrecking my py tires ;) He said he couldn't manually select 2nd but I don't know what he ended up doing. If he did it in some gear besides drive he may have just multiplied by that ratio when he worked out the flywheel horsepower.
i got three runs in, and like you, the guy had to drive my car. 2 of the three were in second, and the third in third...(haha?). but anyways, the gear really didnt make much difference there was just as much difference between run 1 and 2 due to engine temp difference as there was between run 2 and 3.
Beats me. What dyno was it on? Mine was on a Mustang dyno. Logically though my horsepower would have to be in the neighbourhood of 246, I mean a stock HO was 225 and my engine is configured identically to a HO except for a better intake and carburetor. I don't know, maybe I should call the guy and ask him to explain it....
246hp at the crank would equate more to 190-200rwhp, give or take a few...Unless you have some magical 40% driveline loss...lol.
Keep in mind it's not a manual transmission. The dyno guy's been doing this day in, day out for years, I have to believe he knew what he was doing even if I don't know how he did the math.
yeah, yours should be making alot more horsepower seeings how mine is pretty much a stock 200,XXX SO motor...but our dyno RWHP is pretty close, mines an auto also by the way, so that doesnt differ. which either means you have something very wrong with your drivetrain robbing your power, somethings wrong with your engine and its not at full potential, or thier dyno is outta wack. does it feel like its a fast as it should be with your mods? something just doesnt add up
As far as feel goes I don't have alot to compare it to. I do know I can take out pretty much anything else on the road except for modern muscle like the new Mustangs and even then it's kinda close. Maybe he made the run in overdrive or something and then corrected for it on paper. I really need to call him after the weekend.
An auto will show lower dyno results, but not THAT much lower.....Mustang dynos typically show lower results than a Dynojet would as well. What cam is in that thing? I know you say it's the same as an HO, but what year?
Even if your shifter was in O/D the transmission should not have actually shifted into overdrive on a dyno unless he was going like 100+ mph unless your TV cable is fubared out of a adjustment.
Yes, a good condition AOD will have around 20% parasitic loss.
Okay the dyno guy finally replied to my email and this is what he said:
"The tests were run in 3rd as second cannot be manually selected on your car. The conversion I use for SAE net is as follows:
((Wheel HP) + (auto trans loss)) / 0.75
(159+25)/.75 = 245.3 HP SAE Net."
I'm not sitting behind the wheel at the moment but I don't remember my car having an option for 3rd. And anyway my gear ratio graph has 3rd as the 1:1 gear not 0.75:1. Guess I gave the guy too much credit for experience....
Oh well. I kinda had the timing screwed up for that run, I'll probably do better next time.
Stared at the gear selector a bit on the way home. Like I thought there's no selection for third gear. But interestingly enough the 3rd selection up is the Overdrive. Now I know it's been said that it's doubtful the transmission would shift into Overdrive on hard acceleration but I know it has before during a little street race. Besides he didn't stab the gas and go to town with it, he ran it in the midrange for a bit before going for broke. And the overdrive ratio is about right for these results. Just speculation I guess.
Not suprisingly, most of this is way over my head... Nice numbers though! lol