Anyone have any ideas why my car ran this on a G-tech? Are these things that in-accurate? I had very little tire spin and i'm pretty sure the mph is close. Could the 3.08 gears have that effect?
Or am i just completely off base?
Thanks, Jamie

I think that's pretty close to what my stock 70z g-tech'd at a few years ago.

They're fairly accurate, in theory, if correctly calibrated. They just measure a little differently than a track. They're measure instantaneously, where as at the track you have two sets of lights to roll through to start the clock and the mph is measured on the time it takes to cover the last 66' (IIRC) of track rather than the exact mph you're running at the line.

So do you think both numbers are close, or one or the other? I barely got beat by a modded Mach 1 a few moths ago and i think they run low to mid 13's. I really doubt i'm only running mid 14's, but who knows.

Only one way to find out .... take it to the track. Then you will know for sure. I dont know which car you are talking about, but very few vintage Camaros ran much faster than that. Also, look at a clock and see how long a second is. It does not take much wheel spin at all to add a second or two to et.

69 Z11, 355, speed-pro flat tops, 0 deck, 64cc World S/R torquers, Comp XE274H cam, Air Gap intake, 650 Demon carb, Crane points conversion, Accel 300+ wires, Heddman headers, 2 1/2" flowmaster exhaust, 2000 stall, stock TH400, stock 3.08 12 bolt posi, 235/60/15 BFG's.
It only chirped the tires a little, like say out loud; "chirp, chirp!" and that was it.


Did you say it?!!!:D
Is everyone looking at you funny?!:yes:
Thanks, Jamie

Did you get a 60 ft time?
Hard to launch hard with BFG 235/60/15 & 308, I would say it is pretty close.

MBHD

Time sound pretty close, but MPH is up....just IMO.

A 13 second car in the wrong hands will do 14's :yes:

I agree with others here, about the right time and the G-tech is within 0.2 seconds.

When introduced, a '67 Corvette 427 was only 14.20, according to Motor Trend. Very few cars were below 14.80's. MPH of 100 was/is considered a respectable speed from a streetable car.

Thanks guys. That kinda blows. My father-in-laws' Duster runs 12.9's at 104 (at the track) so i guess that's what i'm comparing to.

Your time is not that far off a bone stock 1990 5.7L IROC-Z when tested brand new in September of 1989. That IROC ran a 14.4 @ 97.8 MPH with a 3:23 gear. The 700R4 was the only available trans behind that 5.7L.

When compared to that 1990 5.7L IROC, your car is roughly 2 tenths slower on the time and 4 miles per hour better with the 3:08 gears. That's a pretty accurate comparison even though I have no idea what G-Tech is. LOL !

That mph should be good for mid 13's.

Mark

I would say that is a very realistic number. For the cam you have, you are IMO under geared and under convertored (is that a word?). An XE268 in an otherwise similar combo likes a 2500rpm convertor...I would imagine yours would really like a 2800-3000 stall and a 3.42-3.73 gear. Those 2 changes alone, with traction, would probably knock over 1 second off of your ET.

FWIW, my 4600 pound '78 chevy 1/2 ton with a 2000 stall, 3.08's, 9.4-1 compression 355 with vortecs and a XE268, ran 15.20's at 97-98mph. The high mph relative to the ET's just means you are losing time on the launch, either from tire spin or in yours and my case, not enough gear and convertor. I later swapped the vortec performer rpm intake for a vortec performer, and swapped the edelbrock carb for a 650 holley spreadbore, and went 15.0's at 96.55mph.

I would give you a lower 14's from my experience. That gear and converter are killing you. BFG's are terrible too. Get a 3000 stall you'll shave a couple o tenths and it wont hurt drivability. IMO

Thanks guys. That kinda blows. My father-in-laws' Duster runs 12.9's at 104 (at the track) so i guess that's what i'm comparing to.

You can't compare the two. You were on an un-prep'd surface with very poor street tires (as far as traction). Your 101 mph shows you are making decent power but, even though you only heard a chirp or two from the tires I bet they spun more than you think and if they didn't it's because you didn't nail it, either way this will hurt your times. The gears and tires are your biggest limiting factor right now. What does your F-I-L have for tires on his Duster? What does he have for gears? Looks like he hooks pretty good and has some gear to run 12.9's at 104.

The easiest place to make up time in a drag race is the first half of the track, the closer to the staging beams you make up time the better. The only exception to this is turbo cars but, they are freaky anyway.

The F-I-L runs a mild 340 w/a built 727 w/3000 stall and 4.30 gears and BFG drag radials. I know he's set up WAY better but, i would really like to keep the original gears in my car.
Thanks for any suggestions! Jamie

A 70 Duster without A/C and manual disc brakes weighs about 2900 lbs. with a 4 speed and a little over 3000 lbs with an auto.Also a 340 is one bad smallblock.