Wheel Speed To Shoot For?

97' CTD

97' CTD

FeFiFo-FoFeFeFi
Joined
Jun 4, 2007
Messages
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Couple Options:

Charger: S465 .9 A/R Intended to leave the line from 4000-4200 RPM and to carry 3800 down the track.
Tranny: NV4500

1:
RPM: 3800
Tire Diameter: 33
Axle Ratio: 4.56
Transmission Ratio: 3rd 1.67
Transfer Case Ratio: L 2.72
MPH: 18

2:
RPM: 3800
Tire Diameter: 33
Axle Ratio: 4.56
Transmission Ratio: 4th 1
Transfer Case Ratio: L 2.72
MPH: 30

3:
RPM: 3800
Tire Diameter: 33
Axle Ratio: 4.56
Transmission Ratio: 2nd 3.04
Transfer Case Ratio: H 1
MPH: 26

Raise any eyebrows or am I way OFF????????????
Brandon
 
How'd you figure those? I have an Excel spreadsheet with a calculator I can send you if send me your email....Thats what I use, it figures for the 4500 and 5600, just enter you RPM, tire diameter and gears and it tells you everything else.

I checked all your #'s with it and they all seem right on...I hear lower range puts less strain on the TC though....
 
Also, I think if you can go over 26 you'll do fine, 30 would be great though. Last ime I tried for 28ish, but couldn't get the traction I needed...GPS said 18 mph when the RPMS and tires said I should have hit 26-27. Just kept spinning down the track though. Good Luck!
 
I go 4th in low range. I did that last year and it worked better than 3rd low range. Never tried 2nd hi range though.
 
I would try 4th low and 2nd high a few time at the first of the year. 3rd low would just be a waste of a good pull. As long as you got the power to get up to 25mph and be pretty well hooked, then you should be just fine. If you can get more wheel speed than that and have the power not to choke out, then it would work out alot better for you. Though the faster the wheel speed you have the harder it can be to hook the truck. That can be cured with a good suspension setup and a good driving technique with the clutch. Also be sure you get a double disk when pulling in faster gears like that. A single would fry its self probably the first time out.

Going by your figures, I would try 4th low first and see how that does. If the truck seems to stay hooked and doesn't really choke out at the far end then just stay with that. But if it falls on its face, and cannot keep the RPM up on down the track, then I would try 2nd high and see how that works. It may be just slow enough to keep your rpm up, but yet fast enough to get your ground speed and momentum up enough to litterally luanch the sled as far as you can when the pan or spikes drop to the ground.

Although choosing the gear in pulling is about like circle track racing. One gear maybe better on some tracks but the other gear being better on other tracks. It also depends on the type of sled. A constant drag sled may be better to run 2nd high, but a "running" sled such as the Old Iron Sides would probably do alot better with 4th low. Hope this helps.
 
Last edited:
with the larger turbine housing your running I would say 2HI. What size turbine wheel?
 
JFlagg said:
How'd you figure those? I have an Excel spreadsheet with a calculator I can send you if send me your email....Thats what I use, it figures for the 4500 and 5600, just enter you RPM, tire diameter and gears and it tells you everything else.

I checked all your #'s with it and they all seem right on...I hear lower range puts less strain on the TC though....
Click to expand...


I got mine from Zstroken ^!
Brandon
 
Probably 2nd high.

I ran 28MPH land speed or a bit more the few times I used the GPS, but that was with a 3.0 charger.. probably won't be do-able with a 2.5 charger!
 
Isn't that the same turbine wheel as a silver bullet? Unfortunately you don't that the extended tip compressor wheel though correct?

Can you get me a picture of the turbine wheel?
 
you will have to try it. on paper, 30mph will be better but it depends on the traction you will get. if it drags your rpms out of the range the truck runs best at then drop down a gear.
 
How does this spreadsheet work? Whats lo range 3rd gear 4000rpm with 410's and 31 inch tires?
 
cumminsram said:
How does this spreadsheet work? Whats lo range 3rd gear 4000rpm with 410's and 31 inch tires?
Click to expand...

20 MPH if you plan to carry 4000 down the dirt.
JoeServo I agree I just wanted some info.
Zstroken I am still hunting for that pic, you are right it is not the extended tip.
Brandon
 
Cumminsram give me your email address and I will email it to you
Basically you enter in the gear ratios of your trans tire size, rear end size and transfer case ratio. Then it gives you RPM in 1st, 2nd, 3rd, and OD in low range, then also in 3rd High and OD high. If you want to no ratios in first and second high range just put in 1 for the transfercase ratio. If you guys have requests you want to see on it, let me know and I will add them.
 
Since it isn't a ETT I wander how it compares to a 66mm ett for compressor flow.
 
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