Sunyi

Hi guys

I was at the track for the first time with my newly built 383. A very slipery track I might add. The race was stoped twice due to rain, then canceled.
I was only able to do 4 runs.

This is my best result:
0-60 2.213 sek
Et 108mph
1/4 mile 13.022 sek

My 0-60 foot time is so bad because I had street tires, dumped to 16 psi and they would still smoke all the way through 1st gear. Even others did not get enough traction, no one under 2sek 0-60 even with D/R

The timeslip looks like that it´s from a stock LT1 Shoulden´t my ET be like 110mph +?

There was this 6-speed C5 that did not run under 13.5sek/106mph a single time

What is your opinion? Are these times normal for my setup? Seems very low to me

By the way, I have stock 2.53 gears. Mods are in my sig.

Jloshotz

Don't be dissapointed! Try again with improved track Conditions and let us know how much better of a slip you get then!

robtx

The only thing I would be disappointed with would be the rain. Get some DR's

Sunyi

No can do, there are no "fixed" 1/4mile tracks where i live, they only one 1/8mile for all of the ricers :
The track I was running at today, is an airstrip in use that they close down for dragracing twice a year

I´m afraid that the full potential of a V8 can´t be explored whith a 1/8mile run But I will try.

robtx

I hear ya... But you have to play with the cards your dealt. I live about 15 miles from a 1/8 mile track, so guess what, that's where I go. If you can find a Mustang Dyno. I hear they can perform 1/4 mile run, accurate within .10 second. Also times 60-ft, 100 foot, etc, HP/TQ, Trap Speed.

tjwong

Obviously you have a traction problem. It seems to me that the performance potential of your engine is there. Just think of it this way, for every tenth that you can knock off of your 60 foot time, translates to two tenths at the end of the quarter. Theoretically if you were to pull off a 1.8 sec 60 foot time means that your car would have pulled off a 12.19 quarter instead of the 13.022 time that you got.

Your 2.53 gears are not helping you much to get a decent 60 foot time. The torque from the engine is there, and you need to be able to get it to the ground effectively in order to make a decent 60 foot time so that means better tires or some type of slicks if its allowed in Sweden.

Sunyi

Allright, so I will keep practicing my 60 foot on the 1/8 track. Dragracing is fun About the D/R´s, they are allowed on the street here in Sweden as long as they are DOT approved.
I will try to find some that fits my stock rims.

I have no idea how mutch HP/TQ I am putting out with this setup. Looking at the ET it seems low to me

pablocruise

What was your reaction time?
I see the timeslip, but just want to make sure.
What kind of tree was it?

rocco16

Your ET isn't bad (ET being TIME), but your trapspeed is down. Perhaps your engine is still tight...try again with about 5000 miles on it.
The gears and DR's will help your ET's, which is what wins races.

Larry
code5coupe

Bruce

I am not sure your 383 is making decent hp because your trap speed is very low for a stroker motor. Heck My old 350LT1 with just head and cam did 12.7 @113mph in 1/4. You speed trap tell you your car is making power even if your et is bad. Are you guys remember John Meanny? his 1300hp twin turbo C4 did 11.00 @ 160mph see what I mean.


Bruce

SPEED750

I think your real problem is the gears. 2.53 is very steep. How many gears do you make it though before you trip the lights?

Sunyi

On this particular run, I had a 10 sek zzzzzz time because of "a slight missunderstanding". I thought the other fellow was going to line up next to me, but they wanted me to do s single run.

The tree was two yellow lights one green and one red light.

I had about 0,5 sec reaction time on the other runs.

Sunyi

Im in third gear at about 4500rpm at the finish line.
It realy bogs down when it shifts from 2:nd to 3:rd.

Sunyi

Yeah, thats exactly whats bugging me. I really don´t know what´s holding the motor back.
Timing is ok, I have a full 37deg advance at 2800rpm and the carb is getting fuel as it should. I should have about 350rwhp with my setup. But the timeslip tells a different tale.....

DieL

it could be a few things. first if it rained humidity could have been very high so chances are it would throw you off a bit. The mph does seem very low. It really depends on the details of the motor to be able to verify power output, head flow cam choice etc etc.

What i think it is is the gear choice. I dont think i could imagine 2.5 gears. With a Numnercally higher ratio ( ie. 3.73s) you would have much much greater acceleration, but your traction will suffer greatly, unless of course you have drag radials which helps alot. I also think becase you have a higher stall speed converter the gears are really hurting performance because its taking so long for the motor to pull to those rpms.
One other thing is reaction time doesnt mean anything.. i usually wait a few seconds so the ugly loud cars beside me get down the track so my friends can hae a clear video tape of my run the lights only start when you trip the beam.

comp

gears and traction

SPEED750

That bog from 2nd to 3rd is your holley double pumper. Your gears are keeping it from spinning up fast and your secondarys are wide open. I would think about switching to a vacum secondary, then tweek the spring for max performance. You'll pickup some mpg aswell.