fast89stang

iTrader: (2)

Ok, last year i had Hoosier radials(7 lbs A piece lighter than the pro's I have now), 4.10 gears, and stock seats. Went 6.59 to the 1/8 and 10.32 in the 1/4@129. This year in what I thought was good air, with 4.30 gears, mickey Pro's and race seats (app 60lbs less than stock) I went 6.44@105.63 to 1/8 and 10.18 1/4 @131.52 mph on gas. Air was cool, but not sure on density altitude or humidity. I'd say temp was 65-70. I know i have bumped timing up. In the upper rpm range my timing is at around 39. Could I be leaving some on the table? My thinking is maybe the timing I have works great for the 1/8 but as I stay in the high rpms it is keeping it from making good power up high. Maybe in the 1/8 its carrying it thru cause its so short. Thinking about pulling some timing up high, but not sure where to start. It has me kind of irritated i felt like i would surely get my 9 second time slip this year, but nope. Closest was 10.08@130 (1.35 60ft)with methanol carb on. Switch to gas and go 1.39 60ft and go 10.18@131. I figured I would at least see a high 9.8 to mid 9.9. Help me out guys.........

streetknight2

iTrader: (10)

You could try to remove timing in high gear and see if it helps. Picking up 26 MPH on the back half seems pretty strong to me.

My car starts losing MPH on any timing above 31 degrees on pump gas

ZONES89RS

iTrader: (25)

Was fixing to say the same, if your reeling in 26 more MPH, then it's surely not losing power on the big end. I would be happy if my car ran that good, but I understand knocking on the 9 second barrier being that close is enough to kill you. Cut more weight, that's all I can say.

fast89stang

iTrader: (2)

How can I just pull timing in 3rd gear? Or are you saying just pull it at the rpm's I am at while in 3rd gear?

ZONES89RS

iTrader: (25)

You could use the timing retard but I don't think it will help. It has me curious though.

Doug G

For testing, you could hook up the 12v nitrous wire on the MSD box to a button that you activate, set your timing retard to pull what you want, and use it in high gear at your will ?
Basically make it think its on the juice ?

speedtigger

iTrader: (16)

I feel your pain. Look at the times in my signature. oh oh oh so close. LOL

fast89stang

iTrader: (2)

Yeah, I just knew since it had went 30s on gas in the heat, it would go high 9s in the qtr mile in decent air. I crossed at 7300, but man It kinda worried me turning it up that high so many runs. Thats why i dialed a 10.30, I would just catch em and pedal it. One pass I dialed a 10.30, had a .008 light, and caught him, lifted and lost 13 mph and ran a 10.304 !!!! I cut it a little close on that run. lol The day it was cold tho, we did have a strong head wind. If I ran alcohol sunday, I think I could have got a 9, but I wanna do it on pump gas. I'm gonna mill heads a little more over winter, freshen trans and maybe look into a super vic. But I am still watching Streetknight's progress with the super vic. My trans has been built and ran hard for about 10 years, its probably due for a freshen to firm things up.

fast89stang

iTrader: (2)

May try and figure something out. May just try falling off with timing after so many rpm's. That and the tires plus weight are the only changes from last year. Its went 38 in its current form and went 30 in May. I think last year the best was 6.34. So its real close, I just gotta find it. I think in May it still had stock seats, so from may 6.30 till now the best run is about 6.38-6.41. Its not much when you say it like that, but still frustrating. And it weighs less and swapped from 4.10 to 4.30 gear. Thinking maybe i might swap my gear back if I cant figure anything else out. i was really looking forward to some 20s this year on gas. I dont like having to use alcohol to do it. Its nice to see a 28 come up on board, but even better on pump gas.

speedtigger

iTrader: (16)

Lots of guys do that, but it would make me nervous going 7300 out the back door in the 1/4 on a stock shortblock on a regular basis.

ZONES89RS

iTrader: (25)

My cammed swaps all hit 7200 every time they fire up, what's another 100 RPM? Lol

Doug G

Not the norm for mine, but went 7500+ looking for some ET since I was told LS's like to rpm....ARP rod bolts only on an otherwise stock build. 5-6 times in a row with 3 hot laps.
Didn't find it....probably due to a bad converter ?
7000 is normal so far (only about 20-30 passes to date) and new converter soon

ZONES89RS

iTrader: (25)

Lol, I'm like,"well, I'm driving it, might as well see if the rev limiter works".

fast89stang

iTrader: (2)

i ran 10 1/4 mile passes this weekend. A couple were close to back to back. Car really done good. Sucked cause we ran 1 time trial at 8.30 am sat morning and 1st round wasnt till 6 pm at night.

VLS1

Your combo seems to get out of the hole (60ft times) and to half track really well. But you are nearly 2 mph down at half track compared with DM's 9.87 pass. So in theory, your combo probably isn't making quite the same sort of power, but your converter and combo is really working well at getting you to half track very effectively.

Also if you've geared the car more for 1/8th mile, then you possibly may not be getting the best 1/4 ET's possible out of the car either.

speedtigger

iTrader: (16)

Dave had more camshaft and less converter. So, that dynamic would make sense. I think Dave was 109 MPH in the 1/8th on his best passes.

fast89stang

iTrader: (2)

I just want the most out of it. I only run the 1/4 once a year. But still want to figure my power loss out. I know it's not much, and most wouldn't fuss. But I feel like I have something off. Gonna try pulling timing up high. And may just swap the 4. 10 back in. I should be in easy 20s.

VLS1

Yep, taller gear and less timing. One of the advantages of having the 'right' converter is letting it do the work instead of going with super low ratio gearing, and your converter works as your results have already shown.

Horsepwraddict

iTrader: (12)

Just like others have said, I don't think your times are "off". Its always a battle breaking into the next bracket. Is the car nosing over on the big end? You may have too much gear. Try playing with shift points to keep it in the power a little longer.

dogsballs

I think its pretty good going for 130-131 mph. Definately getting out the hole well with 1.3 60fts. 4.3 really helping in that regard. Is it possible to borrow some taller tyres??

For reference i ran 10.000@135.5 mph, but only 1.45 60ft, this is with 3.7s and 255 radial.