Chevy Nova Forum banner

1 - 20 of 20 Posts

·
Registered
Joined
·
21 Posts
Discussion Starter #1
I recently took my car down the 1/4 mile and would like to get a better et. My setup is a 383 with a 3.90 gear and 28 inch tall drag radial. The car is a 95 percent street car and a 5% track car. My question is would I benefit from a different gear and shorter tire? I was hoping to go to 4.10 and avoid 4.56. My et was 12.9 and I thought it was going to be in the 12.2 range
 

·
Premium Member
Joined
·
3,532 Posts
I recently took my car down the 1/4 mile and would like to get a better et. My setup is a 383 with a 3.90 gear and 28 inch tall drag radial. The car is a 95 percent street car and a 5% track car. My question is would I benefit from a different gear and shorter tire? I was hoping to go to 4.10 and avoid 4.56. My et was 12.9 and I thought it was going to be in the 12.2 range
It would help us out if you gave us some info on your motor and your tranny!
 

·
Registered
Joined
·
508 Posts
also what RPM you traped at and your combo in more detail on the motor to see where you want to be at the end. its always good to try and reach peak HP as you cross the line. a little more info and im sure we can get you in the right set up, if its not already good enough.

on a side note going from a 3.90 to a 4.10 will almost gain yo nothing. maybe .05 to .1 or so. its not worth the money. with the 3.90 and a 28" tire you should be traping around 5700 - 5900 im guessing. hope this helps.
 

·
Registered
Joined
·
21 Posts
Discussion Starter #6
Here is my engine specs
383
Dart aluminum heads 200cc /64cc
Edelbrock RPM
Holley 750dp
10.71 compression ratio
cam Solid lifter
Lift
Intake .358 at cam .537 at valve
exhaust .362 at cam .543 at valve
Duration
intake 288 deg advertised 252 deg at.050 cam lift
exhaust 294 deg advertised 258 deg at .050 cam lift
1 3/4 inch headers with flowmasters
turbo 350 with shift kit
3200 converter
3.90 posi


Time slip
60' 1.838
330 5.345
660 8.257
MPH 84.79
990 10.780
1320 12.930
mph 104.52

no tire spin
trap rpm was about 5100
 

·
Premium Member
Joined
·
3,532 Posts
You have more than enough motor to run 12.20's. Your sixty foot time should be somewhere in the 1.6 range I would think. I belive you have some tuning to do as you should have a little more mph then it does. What is your timing at and how do the plugs look?
 

·
Registered
Joined
·
21 Posts
Discussion Starter #8
I believe the timing was at about 40 deg total and the plugs were a little on the lean side. The timing was then backed off to 36 deg.
 

·
Registered
Joined
·
139 Posts
timing

Definetely your 60 foot is way off.
Either you do not have the stall you think you do or the converter is trash... taht is one thing to check.

Next would be the advance curve of the distributor. You need to get in all the 36 38 or 40 degree advance in before 2500-3000 rpms. This can be acomplished with a advance curve spring kit.

What ignition system are you using?

It looks like you have very good parts for the whole engine...HOPE you did not use a stock ignition with it...:( All that power wasted...

Get a Multi spark box MSD Accel or something and a distributor you can control the intial and mechanical advance on and you will NOT need to change any ratio. your car will run those numbers you just need to LIGHT THE FIRE!

Jim
 

·
Premium Member
Joined
·
11,072 Posts
Do you know what the car weighs with you onboard? Your e.t./mph are well matched, but you seem to be down on power. If the weight is about 3500, you're only making about 375 h.p. I would think it should be quite a bit more from your specs. 12.20's at 3500 lbs. would take about 445 h.p.
As for your 60 ft. times, 1/10 in 60' is usually about 2/10 off the e.t. at the other end.
 

·
Registered
Joined
·
21 Posts
Discussion Starter #11
The engine has a HEI with a MSD 6al. The weight of the car w/ my big a** is a little under 3600. Any Ideas on the rev capabilities of this combo?
Mike
 

·
Premium Member
Joined
·
3,532 Posts
The engine has a HEI with a MSD 6al. The weight of the car w/ my big a** is a little under 3600. Any Ideas on the rev capabilities of this combo?
Mike
I would think that it should make power to the 6500-6800 range. Is the cam installed straight up?
 

·
Registered
Joined
·
508 Posts
Well the 60' is about right imo. For the mph and et your car is running your 60' shouldnt get much lower. If your lucky you might get in the mid 1.7's . As for how high the motor will go im saying the max rpm you want to take it to would be 6000. Its got enough stroke and its going to want to grunt a little. Shift at 6k and try and get it to trap at 6k. (for the track) it might make more power higher than that but its hard to say. Just keep working with your combo and your time will improve. Not sure if you will get that 12.20 mark for sure but its drf. Not imposible.


P.s. My chevelle ran a best of 12.53 @ 109 mph with a 1.80 60' on motor. And averged 12.80's all day @105-106 mph with 1.8x 60'. With dam near the same set up as you.
 

·
Registered
Joined
·
36 Posts
Is it just me,or the cam is too big for his drivetrain setup.
25X duration at .050 is pretty big.Unless you have a 4000+converter and 5.13 gears.
 

·
Premium Member
Joined
·
11,072 Posts
Well the 60' is about right imo. For the mph and et your car is running your 60' shouldnt get much lower. If your lucky you might get in the mid 1.7's . As for how high the motor will go im saying the max rpm you want to take it to would be 6000
Dale's 66 with 3.08's, a real tight converter and 235 drag radials using stock suspension had 60's in the 1.6's.
With the cam in mikes69, it might need a little more converter to lower the 60 fts.
As for the rpm, I'd shift at 6300-6700--make passes at different shift points and see what it likes.
 

·
Registered
Joined
·
2,541 Posts
you forgot to mention the lobe separtion on the cam? whats the lobe separtion? that has a lot to do with the way the motor runs too. you can also give us the intake and exhaust lobe centerlines and we can figure the separtion with those 2 figures for you....
 

·
Registered
Joined
·
94 Posts
4.10s 26 tall tire is 6200 to6400, timing at 40? a little much some say you can gain some et by just getting you timing were it needs to be say 35 36.
 

·
Registered
Joined
·
21 Posts
Discussion Starter #19
I finally got to run my car on Sunday. I realized that I was not getting full throtle. I had 60 ft times in the 1.73 range and ran a best of 12.25. I still believe there is alot more in my engine. would open headers and an open plenum intake shave of the 2.5 thenths to get me in the 11s?
 
1 - 20 of 20 Posts
Top