ok heres the skinny. car is 95% my street car. doesnt go to the track that often but will be going more once i get a few issues sorted out. has a 416ci motor and i shift it at 6800. also has nitrous but that wont be coming on until 2nd gear. currently i am running a 4.10. on the street they flat out suck imo. so im thinking of switching to a 3.73 or 3.54 (dana 60) has anyone noticed any substantial diff in the way the car 60's with the taller gear as oppsoed to the shorter gear? and i know the 28" tire is only going to amplify this. im also concerned that at some point this car may be approaching speeds of 140mph in the 1/4 (with enough spray) and i dont want to run out of gear in the top end.

 

4.11's and a 28" tire should be plenty to do 140+... Are you running a 28" tall tire now?

 

should be 138 mph in a perfect world. not assuming no clutch slip and the tire growing 1/2-1" on the top end it will give me about 142-143. and im still stuck with 125 mph on the street (i run a 26 on the street)

 

Your 28s are slicks, so i know they grow on the big end, but by how much I don't know, I just threw in 29 for the growth as I have no real clue without searching. If you don't count growth, the 28/4.11 combo doesn't hit 140 at the RPM you're looking for.



1st 2nd 3rd 4th

6800 52 77 106 138 - 28/4.11
6900 53 79 108 140
7000 53 80 109 142

6800 54 80 110 143 - 29/4.11
6900 54 81 111 145
7000 55 83 113 147

6800 57 85 117 152 - 28/3.73
6900 58 87 119 154
7000 59 88 120 156

6800 59 88 121 157 - 29/3.73
6900 60 90 123 160
7000 61 91 125 162

6800 60 90 123 160 - 28/3.54
6900 61 91 125 162
7000 62 93 127 165

6800 62 93 127 166 - 29/3.54
6900 63 94 129 168
7000 64 96 131 171

 

26/3.73

6800 53 79 108 141
6900 54 80 110 143
7000 55 82 112 145

28/3.73

6800 57 85 117 152 - 28/3.73
6900 58 87 119 154
7000 59 88 120 156

This might be a better match for street and strip, since you do hit the street more Tommy.

 

bump.

 

How do you launch? Do you slip the clutch out of the hole or dump it? Have you launched at the track on the 4.10's? How does the car react?

 

i have yet to launch it with the current set up. i have a 2step in the car so i just dump it. on the old combo i would dump it at 6k but that was 390rwhp/ 360 rwtq and an aluminum flywheel which always made the car bog. i now have a 26lb steel flywheel, dual disc mcleod clutch and 500rwhp/ 465 rwtq on the motor. i think ill have the n20 come on in 2nd gear. also will be getting a bit more power out of it soon hopefully-torque namely.

 

My old 408 WS6 had about the same HP with a McLeod twin and steel flywheel. The flywheel helps, but I think you are going to need more gear than what you are thinking about. I ran 4.56's when I was playing with just the motor at the track. I tried 4.11's and I still had some bog. On a 100 shot out of the hole, the 4.11's worked fine. If you are going to run any gear less than that, you will need to spray out the hole to prevent bogging. The only bad thing about 4.56's and gas, is trying to keep up with the shifting.

Or, invest in another center section. One for motor at the track, and one for driving around town and spraying at the track.

 

did you loose much in the 60 with the taller gear? id like to be able to get it down into the 1.4's.

 

I run a 4.10 with a 28" tire and shift at 6800. 463/413 in a pretty light car. It's not enough gear all motor. I am still dialing it in but I think a 4.56 or a 4.30 would be better for me NA. A friend has suggested a 26" tire on motor and a 28" on the spray.

 

With the 4.10's and a 100 shot out of the hole, I was in the high 1.4's with some traction issues. With the 4.56's, I was in the high 1.4's on motor with some, but less traction issues.

Changing tire sizes also help.

But I think you don't want to go any lower that the 4.10's unless you plan on spraying out of the hole. Some 26" tires and the 4.10's should be good enough for getting you out of the hole without bogging.

 

ya i def dont think the 26 and 4.10 combo is going to happen. that only allows me 127 and i was going 122 before on motor. id fully expect to be around 125 now and then theres a 200 shot on top of that. its all in a single stage too so i cant leave on a 100. guess i just need to decide if i want to deal with the way it drives now on the street, but there is no way in hell i am going to a 4.56. 114 mph on the street is not going to work.

 

You could always look at a progressive controller.

 

its crossed my mind. i just trying to avoid that as its a lot harder on the solenoids. maybe ill wait and just take it down the track a couple times with the 4.10's and see how it reacts. if it bogs real bad ill just live with them.