Losing the MPH doesn't affect the ET as much as you'd think Thumper.

Yep. I stood on the brakes at Norwalk in my slow car, scrubbed 11 miles an hour off, slowed the car down a tenth is all.

Last time out on my 1st pass I pounded the brakes and went 7.1 at 63 mph then a 6.15 at 109 slightly lifting before the 660. Prior to that I went 6.20 at 111.78 all out 2 summers ago..........

Using the previous 1000'-1320' times shows it would have gone about 9.82.

Using the 1/8-1/4 conversion for the 6.22 1/8 shows 9.77(Using the 1/8-1/4 conversion for the first two passes it shows 9.958 and 9.898).

Decent runs for the first outing.

In theory, it needs to run under 6.10 1/8 to run in the 9.50's.

I think horsepower. mile an hour breaks no breaks is all irrelevant... I think the only thing that matters is long as owner is happy... that's all that matters and never judge anything by the first outing.. I would imagine over the next ten or twelve outings you're going to find more et

I agree. That said, based on the mph and weight of the car it's making about 650 ponies. Nowhere near 770. It would have to run about 141 mph to be making even 700
My old Duster went 10.03 first time I ever had it out. Best it ever went was 9.85. Difference in mph from that first outing in pretty good air running the 10.03 to its best of 9.85 was about 1.5 mph. 133.50 to right at 135.

PLEASE don't tell me a dyno inflated the numbers, AGAIN!!!!!!LOL

Lol. Your too much John

Being that his car is almost TOTALLY new and different suspension/engine wise, I still think he will run 9.50`s in good air when sorted out. It`s not leaving right, pulls to one side when launching and has other "new car" issues we`ve all experienced............

WHAT!!!!!!!!!!! LOL
You did see the name TED gave me didn't you.
ST. John

I don't know, but the little experience I have about dynoing an engine is that you very seldom find something like 70 hp with ignition and jetting and other small stuff, unless it's way off in the beginning. Unfortunately ours have not been, so we have had to settle for smaller numbers.

When you scrub MPH at the top end by using the brakes big time, the car already covers 1200+ feet at full throttle, and full mph for those places on the track under full power. The mph before hitting the brakes would have been a lot higher than that in the mph lights. So the 1200 ft numbers (if there were beams there to get em) would be the same.
To see this in a much larger way, look at a top fuel time slip where the guy lifted at the 660 mark and coasted through the mph traps.

Congrats on the first time out with a lot of new stuff. Your 60' times are pretty soft for what it is so no doubt it will go quicker. As for the dyno numbers don't sweat naysayers just keep chipping away. I stand by my prediction and bet that's where you end up. Just keep chugging away.

As for killing ET up top. most any bracket racer will tell you it is VERY hard to kill much ET up top. You can scrub a fair amount of MPH and loose very little ET. As Dustion pointed out do the splits, but since it picked up on all the incriments it would likely have been a tad quicker than .82, but honestly it is all the "hard" data we have to work with. Basing it off the 1/8 mile I'd bet had you legged it out would have been close to 9.78 or so.

They are ALL air pumps and they all work the same way.........regardless of what it says on the valve cover it is.

Got me worried now Lol, my 470 dyno'd at 630 hp, since then i've milled .040 off the head and changed .060 gaskets for .040 so maybe 650 hp, might go slower than my old 600hp combo.
Mick

My Sons .040 (360) duster that weights 3150 has gone 6.40's and is nowhere near 600 horsepower. Looking at your sig something isn't adding up.

Hi, By nowhere near 600 or did you mean 650?

1/8th mile
Your Flywheel HP is 583
computed from your vehicle weight of 3150 pounds and ET of 6.44 seconds.

My[quote=Al_Alguire]Congrats on the first time out with a lot of new stuff. Your 60' times are pretty soft

Basing it off the 1/8 mile I'd bet had you legged it out would have been close to 9.78 or so.

Thanks Al, I set the car up so I could foot brake it for the first few runs and it chattered the tires the first two runs as I'm still trying to understand what shock settings it wants, with only three runs I didn't mess with timing, only jets and bleeds. It nosed over the first two runs about 100 foot before the stripe so a changed the limiter from 7400 to 8000 and I believe it would have been in the 70's if I would have held it. One thing I'm sure is an issue is the engine was dynoed with 2 1/4" headers, I have 1 7/8" fender wells so I'm sure I'm killing some off there, as Far as the neigh sayers I have heard of guys putting their cars together and running to its max potential within three runs......but have never met one?

Congrats on a good outing! Tuning requires alot of passes.

You are roughly down 6 mph from where your HP numbers and car weight say you SHOULD be. There is rarely 6 mph in tuning unless converter or something similar is way off. The part above I highlighted could be a LOT of the reason and is probably that "something". Those headers are likely killing it