DeTomaso Mailing List: October 2000, Message #99

Conversing with the 'Mad One', we were discussing higher 5th's of the 
gear kind and higher overall rear ratios.

My comments to him were as follows below and he said:
"i THINK YOUR DEAD ON THE MONEY....CARE TO SHARE WITH FORUM?? :-)
THANKS....think I can at least afford a 3.77 gear"

So, here's what I said. Using Mike Dailey's Excel spreadsheet, I just 
banged in numbers for a .655 5th in combination with either a 4:22 
rearend or a 3:77 rearend.

For what ever it's worth...

-----Original Message-----
From: Kirby Schrader <schrader@ev1.net>
To: Dennis Antenucci <itbewild@gte.net>
Date: Tuesday, October 03, 2000 12:25 PM
Subject: Re: Which reminds me....

>hell no, but still need to know how the 5th gear coupled with the 3.77 gear
>improves R's and speed...when I spoke to Dennis Q he said he wasn't sure but
>he thought it DID improve top end speed without the loss of torque...was
>just curious HOW MUCH....before i invest in BOTH

Ahh.... I think I see what you're asking now.
Well, the new 5th gear is a .655 according to what Marino said. So
with a 4.22 rear end, you'd get... (make sure you view the email in a
fixed width font like Courier)

RPM 1st 2nd 3rd 4th 5th
1000 8 13 18 22 29
1500 13 19 27 33 43
2000 17 25 36 44 57
2500 21 32 45 55 71
3000 25 38 54 66 86
3500 29 44 63 77 100
4000 34 51 72 88 114
4500 38 57 81 99 128
5000 42 64 90 110 143
5500 46 70 99 121 157
6000 50 76 108 132 171
6500 54 83 117 144 185
7000 59 89 126 155 200
7500 63 95 135 166 214
8000 67 102 144 177 228

And with a 3.77 gear, you'd get...

RPM 1st 2nd 3rd 4th 5th
1000 9 14 20 25 32
1500 14 21 30 37 48
2000 19 28 40 49 64
2500 23 36 50 62 80
3000 28 43 60 74 96
3500 33 50 70 87 112
4000 38 57 80 99 128
4500 42 64 90 111 144
5000 47 71 101 124 160
5500 52 78 111 136 176
6000 56 85 121 148 192
6500 61 92 131 161 208
7000 66 100 141 173 223
7500 70 107 151 185 239
8000 75 114 161 198 255

Either way you go, you get increased speed with decreased rpm. And as
long as you've got the power, you should be able to push the car to
at least 200 from I can see.

Seems to me with the .655 5th _and_ the 3:77 rearend, you'd be pretty
much right on top of your torque curve at over 200mph.

Of course, what the hell do I know about it... eh?  :-)))

Seriously, when I get rich, I'd planned to go with both of the changes.

Later,

Kirby

PS I left the tire diameter at 26.5"