Test & Tune: 4.10 to 4.88 Results!

So no one ever commented on having negative da??

Does this not effect 1/4 mile times?

Trainman??

Was I being negative too?

I agree, but there are other factors too. Like humidity, which I really don't understand, except drier is better. I was just looking at his earlier timeslip compared to the newest one. Nearly identical 60', 330' and 1/8th mile times. His real gain in ET was after the 1/8th mile while he is driving in 4th gear. I really feel that with Drag Radials he will be well into the 12's, his 60' times initially will be in the high 1.70's to low 1.80's which should yield a 12.60-12.70 timeslip. That will be fun.
 
1500 ft is huge in terms of DA! The fact he had a negative DA run was the real factor I believe. I do agree he'll get into the high 12s with right tire and practice.
The crap talking on the other forum is not cool though? Oh well:dontknow:
 
Lets see how Cody does in similar DA's to his previous runs. Either way hard to compare between several different mods, da's and other inconsistencies. If you had fun that's all that matters.
 
Lets see how Cody does in similar DA's to his previous runs. Either way hard to compare between several different mods, da's and other inconsistencies. If you had fun that's all that matters.

That's what it's all about! Enjoying your truck, your way :burnout:
 
It seems I need to buckle down and learn about density altitude ans such, may help me choose better days to run. I cut a 12.9 @ 109 at that track with my other truck on street tires, and a 1.9 60' with an 8.4 1/8, that truck was a 06 with billy boat headers and mids, magnaflow exhaust, , b&m shifter, qa1's and caltracs, and air bags up front at that time...I raised the front as high as she'd go and pulled a 12.9, but all day long it had been running 13.1's til then. That truck also had the stock 4.56's

What's the tallest Dr I can get on a 17" wheel? I really do want to grind calipers
 
It seems I need to buckle down and learn about density altitude ans such, may help me choose better days to run. I cut a 12.9 @ 109 at that track with my other truck on street tires, and a 1.9 60' with an 8.4 1/8, that truck was a 06 with billy boat headers and mids, magnaflow exhaust, , b&m shifter, qa1's and caltracs, and air bags up front at that time...I raised the front as high as she'd go and pulled a 12.9, but all day long it had been running 13.1's til then.

What's the tallest Dr I can get on a 17" wheel? I really do want to grind calipers

The 390 is biggest as far as I know and think its 29"! Too short for my 4.56 rear :(
You do wanna grind? Get a 16" wheel and more tire sizes :burnout:
 
I agree, but there are other factors too. Like humidity, which I really don't understand, except drier is better.

Drier air effectively lowers DA. The easy explanation is that moist air is less dense than dry air. If you have access to percentage of relative humidity, the correction is a super easy math problem. Or, if your a caveman, you can just use an app like AutoDens to do it for you :D

Signed,
An Alleged Douchebag
 
your da on 12/17/12 12:23am was 923ft corrected run was [email protected]

your da on 2/16/13 8:46pm was -546 ft corrected run was [email protected]

glad you had fun but i dont thik your truck is any faster bro just really good air homie.

reguardless you had fun

So with corrected DA I went 0.029 seconds slower with the 4.88's and front cans gutted (and stock intake instead of volant) but I gained 2 MPH? Could have been worse I suppose, and common sense tells me that with the added traction loss with the 4.88's and only loosing 0.029 seconds, when I get some slicks and get the most out of them I still believe I will be better off...we shall see when I find me some tires.


Actually the 4.88's with stock tires give you a theoretical max speed in 4th gear of 116.18 mph at 6050 rpm (factory redline). I figure that this way: tire diameter 31.5" x 3.1416 = 98.96" circumference. Engine revs per hour at 1000 rpm = 60,000 revs. 60,000 divided by 4.88 = 12,295 turns of the tire per hour. 12,295 x 98.96" = 1,216,721.3 " traveled in 1 hour , divided by 12" = 101,393.44 feet traveled in one hour, divided by 5,280 = 19.20 mph per 1,000 rpm in 4th gear. 19.20 x 6.05 (6,050 rpm) = 116.18 mph @ 6,050 rpm in 4th with stock tires. Now if you mount the drag radials (29.5" diameter) top speed in 4th drops to 108.80 mph. Possibly a little more due to tire growth, I actually did 118.15 on drag radials with 4.56 gears (which works out to 6,140 rpm, my rev limiter is set at 6,200 rpm).:rock::burnout:

On the interstate and track I'm redlining at 111mph in my truck, not sure if my speedo is off or what, but when it hits the limiter that's the speed it shows. I wish she was doing 116 in 4th though, soon I'll be bumping my redline up as well...
 
So with corrected DA I went 0.029 seconds slower with the 4.88's and front cans gutted (and stock intake instead of volant) but I gained 2 MPH? Could have been worse I suppose, and common sense tells me that with the added traction loss with the 4.88's and only loosing 0.029 seconds, when I get some slicks and get the most out of them I still believe I will be better off...we shall see when I find me some tires.




On the interstate and track I'm redlining at 111mph in my truck, not sure if my speedo is off or what, but when it hits the limiter that's the speed it shows. I wish she was doing 116 in 4th though, soon I'll be bumping my redline up as well...

Interesting!! That's about where I redline at :dontknow:
Like Trainman says though I should be able to go 116-118:argh:
 
So with corrected DA I went 0.029 seconds slower with the 4.88's and front cans gutted (and stock intake instead of volant) but I gained 2 MPH? Could have been worse I suppose, and common sense tells me that with the added traction loss with the 4.88's and only loosing 0.029 seconds, when I get some slicks and get the most out of them I still believe I will be better off...we shall see when I find me some tires.




On the interstate and track I'm redlining at 111mph in my truck, not sure if my speedo is off or what, but when it hits the limiter that's the speed it shows. I wish she was doing 116 in 4th though, soon I'll be bumping my redline up as well...

Your mph came from spinning.
But with slicks do you credit your better ets. To the gears or the slicks?
 
You have 4.56's?

As far as I know :confused:
The math says 4.56, but my truck will not, period, in 95,000 miles and hundreds of track passes on everything from stock 22's, M&H 390, 325's, 28", and 32", there's absolutely no way mine will trap that high! I hit limiter at 110-111 and just did it weekend before last. (I never have hit the limiter till then but always within a couple hundred rpms
 
Last edited:
Your mph came from spinning.
But with slicks do you credit your better ets. To the gears or the slicks?

Harder launch with the 4.88's over the 4.10's maybe? And the fact that you can take 2 identical trucks, put 4.10's in one and 4.88's in the other, and drive them side by side from 30 MPH then have them accelerate to 70mph, the 4.88 truck will get there first, pulls harder. Maybe that's why I gained a lil speed with worse 60' times...hmmm
 
As far as I know :confused:
The math says 4.56, but my truck will not, period, in 95,000 miles and hundreds of track passes on everything from stock 22's, M&H 390, 325's, 28", and 32", there's absolutely no way mine will trap that high! I hit limiter at 110-111 and just did it weekend before last. (I never have hit the limiter till then but always within a couple hundred rpms

Smells like 4.88's to me!! Haha :D
 
Smells like 4.88's to me!! Haha :D

I've thought that but made a thread about what rpm are you at 5th gear 45 mph or something and folks with 4.56 were identical to mine so I ruled 4.88 out. Many people thought that may have been the case, but I bought the truck with not a single mod on it so found it hard to believe someone put 4.88s in her?
Gonna do a test like your with GPS mph and see where I hit my limiter on my full "Kill Mode" setup which the slicks are identical height to our 22's
 
I've thought that but made a thread about what rpm are you at 5th gear 45 mph or something and folks with 4.56 were identical to mine so I ruled 4.88 out. Many people thought that may have been the case, but I bought the truck with not a single mod on it so found it hard to believe someone put 4.88s in her?
Gonna do a test like your with GPS mph and see where I hit my limiter on my full "Kill Mode" setup which the slicks are identical height to our 22's

Ill go take a few pics and post them, see where im at @ 45mph in 5th.
 
Here's something interesting, I found my first time slip from when my truck was pure stock, full weight , on street tires,4.10 gears. Oct. 23, 2005 at Famoso , noon, 74 degrees, DA 1928': 60' 2.002, 330' 5.529, 1/8th mile 8.437 @ 85.14, 1000' 10.954, 1/4 mile 13.070 @ 106.82 mph.
 

Latest posts

Support Us

Become A Supporting Member Today!

Click Here For Details

Back
Top