More gear. .......

[440727]

Last weekend I raced my 1967 dodge coronet 440/727/3.23 with best et 14.26 at 93mph.
Looking to improve ets.

Would I do better with 3.55/3.73/3.91 gears?

Thanks Mike

 

[SUPERSTOCKRACER]

We'll need to know more about your engine combo. What was peak torque and peak HP more importantly.
I just changed engine combo's and I need more gear myself because my maximum HP is at 7400 now from 6800.
i'm crossing the stripe way before my HP RPM comes in at.
Also You'll need to know what your converter stalls at as well to help you get a better ET> BTW Welcome aboard.

 

[mopar 3 B]

Need more gear reduce tire diameter.

 

[Budnicks]

Generally;
Yes the steeper {lower} gears will help for torque multiplications
helps move a heavy car, IMO for street/strip a 10:1 final ratio
basically your trans 1st gear ratio x rear end gear ratio
{& tire size, taller tire cuts the ratio}...
That is a great place to start...

a 3.73:1 or 3.90:1 is a decent compromise
for more of a mostly strip car/street light burner 4.10:1 - 4.88:1's
depending on your tire size & engines rpm range

play with this program
http://vexer.com/automotive-tools/speed-rpm-calculator
it's not "100% real world", play with the torque converter efficiency @ 85-90%
change the rpm-bar to match what your car does in high gear crossing the line,
but it gives you an idea of what changes to gear & tire etc. can do...

also this site
http://www.wallaceracing.com/Calculators.htm
has a ton of calculators too

 

[lewtot184]

depends. lower gears don't work in stock or near stock combo's. low 14's at 93mph tells me there is a horsepower issue, not gear.

 

[Dodge 330]

depends. lower gears don't work in stock or near stock combo's. low 14's at 93mph tells me there is a horsepower issue, not gear.

I would agree. Deeper gears won't gain you much if anything with this combo. Been there and done that.

 

[Budnicks]

IMO it will 60ft & 660ft better, no matter what,
unless it's just street tires than it'll just spin more probably
better 60ft which generally aides in better ET's
just getting the heavy car moving easier...

I don't know his specific combo, MPH is kind a low

In my experience...

 

[440727]

Here's my slip

 

[440727]

 

[440727]

1000-5500 power band

 

[440727]

440 0.30 10.5 compression, edelbrock 440 preformer intake, 750 holley

Stock 727 with turbo action 3k stall

8 3/4 with 3.23 sure grip

 

[440727]

26in tires

 

[Dodge 330]

A shift kit like a Trans-Go TF-2 will help. I was running 104mph with a very similar Combo. Your intake is a big cork too.

 

[IQ52]

Generally;
Yes the steeper {lower} gears will help for torque multiplications
helps move a heavy car, IMO for street/strip a 10:1 final ratio
basically your trans 1st gear ratio x rear end gear ratio
{& tire size, taller tire cuts the ratio}...
That is a great place to start...

a 3.73:1 or 3.90:1 is a decent compromise
for more of a mostly strip car/street light burner 4.10:1 - 4.88:1's
depending on your tire size & engines rpm range

play with this program
http://vexer.com/automotive-tools/speed-rpm-calculator
it's not "100% real world", play with the torque converter efficiency @ 85-90%
change the rpm-bar to match what your car does in high gear crossing the line,
but it gives you an idea of what changes to gear & tire etc. can do...

also this site
http://www.wallaceracing.com/Calculators.htm
has a ton of calculators too

I wish I knew 1/10 of what this Budnicks guy knows about setting these cars up.

 

[lewtot184]

440 0.30 10.5 compression, edelbrock 440 preformer intake, 750 holley

Stock 727 with turbo action 3k stall

8 3/4 with 3.23 sure grip

that cam doesn't need a 3k converter. in fact, the cam is way too small for 10.5:1. it would run fine with a stock 11 3/4" converter with that cam and may pick up a couple mph in the 1/4. i still say you have a horsepower problem, not gear.

 

[RT K_line]

X2 not enough cam for the combo

 

[IQ52]

How is this thing not cracking pistons because of detonation at that compression ratio and that small of a camshaft? Something doesn't add up.

 

[440727]

It's got 915 heads. Engine shop told me 10:5......run 93.....which I do
Compression high cuz I ran low on fuel in ArKansas cruising around and gas station only had 87.......car was pinging until next gas station.

 

[440727]

Cam and intake best recommendations ?

Thanks guys!

 

[mopar 3 B]

One thing you may want to consider. How much time are you planning on spending at the track?
How much are you willing to spend on your quest for speed? Will it be street worthy when done?
Do you enjoy your ride now? You may want to reconsider and leave it just the way it is and work on improving your time from point a to b.