CONTEST : Guess the HP and WIN!
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Damn only 3 HP off guessed a Chrysler number 426. All you can do is try! lol
Was there any tuning done on the dyno? or was it run what ya brung?
Yunick13
2 Time FABO NASCAR champ 2023 FABO NHRA champ
Figuring 15% drivetrain loss, that's 493hp at the crank. I was thinking it'd make over 500 hp at the crank.
We had the dyno to ourselves so we did a bunch of tuning. First we made a baseline pull, threw in a new set of plugs, rejetted the carb and played with timing going from as low as 32 degrees and as high as 38. 36 degrees ended up being the sweet spot.
The 5800 stall converter didn’t help much either.
You were the page 1 leader with the winner coming from page 3. lol
33IMP
Well-Known Member
I think your drivtrain loss on the dyno is a lot more than 15%, especially with that much converter.
I bet that engine puts out 550 plus, on an engine dyno, and I stand by my low 10s prediction.
My car got into the nines with 400 whp, but it was light.
I bet that engine puts out 550 plus, on an engine dyno, and I stand by my low 10s prediction.
My car got into the nines with 400 whp, but it was light.
lead69
hopeless car junkie
I wish we could have ran that across the engine dyno with a Tim tune job, mine picked up a little over 20hp from a custom timing curve. We saw the same thing with the last 408 tested, it had trick flow heads as well. It's hard to know how much timing it wants and where without an engine dyno since he can adjust timing at every 1k rpm under load to see the changes. I agree with 33IMP about percentage of loss and think the car should show better et/mph than what the chassis dyno numbers indicate.
Yep I agree, after break in and the header swap. It went from 630 to 685 it took a little bit because its a tunnel ram/ brand new build basically. Tim is good, and he's a really nice dude.
What does the t-shirt have on it, a picture of your challenger with the words "Hard member" below it ?
Man I'm disappointed in my guess. Lol
I think you'll be back to square one on tuning once you get the engine in the car
It should be really really close.
The track and the Dyno are at the same elevation. As soon as it's in, I'll be running it up and down the street to dial it in, but I'm confident with what Tim has done
lead69
hopeless car junkie
Once the baseline is set it should only be "tweaks" since the engine will want the same basic timing curve etc. I do agree the total timing and some carb tweaks could optimize performance depending on weather/altitude conditions. The majority of guys I see at the track don't even bother, they just run it.
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What were your peak numbers at ?
Swinger 340
Well-Known Member
Nice set-up. Is this a Dyno hp or a strip reading on the hp. Need more information, as in Temp, height and humidity, if it is a strip reading.
Thanks. This is on a chassis dyno with SAE correction.
429.24 @ 6040 and 382.10 @ 5800.
Converter flashed consistantly at 5700 rpms and with the peak power being so low, I feel that it is running out of camshaft or the heads/intake aren't flowing what I expected. Good news is, this combo will run mid 10's shifting at 6500 rpms or less. Should last a long time! lol
Now to decide if I play with what I got or build a big block.
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haha, too funny....
lol, you might have a "Hard Member" t-shirt coming your way. Could have swore I saw one sitting on that can of F4 green paint!
Now to decide if I play with what I got or build a big block.
Don’t forget the back-half and four-link!
This thing is going to be in the 8s by this time next year, if you keep going like this.
Thanks for the reminder! lol
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