4:77's & 35's...some stats...

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Originally Posted by nfpgasmask

Dub, but in a straight on acceleration situation on dry tarmack, how do the 4.77s feel different?

Just curious.

Bart

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:yesgray:

Butt dyno feels like about 15-20 more HP.

So there's a significant increase to low end performance. Is there any loss in high end performance?

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Originally Posted by tom4bren

So there's a significant increase to low end performance. Is there any loss in high end performance?

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How would I know...:_confused

I haven't taken it to the top end since the first week I got it, just to see how far the needle would go...:naughty:

But I'd guess that it would still top out around 110-115, as it's pretty close to the orig gearing. (7% diff)

Prolly not a good idea to take meaty beaty big & bouncy off road tires up to that speed anyway...:smilewink

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Originally Posted by samneil2000

I wonder if the rear axle shafts are strong enough for the 35's and offroading

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The rear 12-bolt is plenty strong, I never had a problem wheeling with 35s. The front CVs are more of a concern, although a little sanity with the skinny pedal goes a long way.

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Originally Posted by nfpgasmask

Weird, 7% is the number I came up with (and subsequently have programed into my Scan Guage II) to calculate my actual speed with my 2" lift and 265 tires.

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Yep, that's about right, although actual tire sizes will vary a bit, despite what the sidewall says. I used 7% when I had the old 99 Trooper and 265/75s.

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Originally Posted by tom4bren

So there's a significant increase to low end performance. Is there any loss in high end performance?

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I was better able to maintain speed up steep grades with the 4.77's. Throttle response was prolly 1.1% greater as well. :smilewink

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Originally Posted by ZEUS

I was better able to maintain speed up steep grades with the 4.77's. Throttle response was prolly 1.1% greater as well. :smilewink

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I'll never forget the time I took you back to your camp in Moab.

After I gave the ol' girl a good kick in the slats, you looked at me & said: "you're gonna LOVE gears"...:yesgray:

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Originally Posted by Ldub

How would I know...:_confused

I haven't taken it to the top end since the first week I got it, just to see how far the needle would go...:naughty:

But I'd guess that it would still top out around 110-115, as it's pretty close to the orig gearing. (7% diff)

Prolly not a good idea to take meaty beaty big & bouncy off road tires up to that speed anyway...:smilewink

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Point taken but what I was thinking about was the increased rev at highway speeds. I forgetted that your gearing with big meat took you back to close to stock performance.:)

So realistically, what do you folks in the know think the perceived difference would be going from 4.54s to 4.77s? Is it too close to even make much of a difference? Or will there be some apparent gains? And no, I am not talking about the VX. I am talking about the Trooper. Something came in the mail today and it might just be Unicorn Tears (with a few hen's teeth in there as well).

:D Bart

I would say yes. It is quite a difference. It makes the VX accelerate amazingly well for having larger tires. And I just got 17mpg my last road trip this last weekend. Best ever after the lift and tires and all. Maybe has to do with all new pulleys on the engine haha :-)

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Originally Posted by LittleBeast

I would say yes. It is quite a difference. It makes the VX accelerate amazingly well for having larger tires. And I just got 17mpg my last road trip this last weekend. Best ever after the lift and tires and all. Maybe has to do with all new pulleys on the engine haha :-)

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I know the difference is good with the VX (going from 4.30s to 4.77s) but I am talking about going from 4.54s to 4.77s with my Trooper.

Bart

BTW, I took this pic in my garage tonight.

http://www.isuzugeek.org/forumpics/trooper/477s.jpg

I haven't counted teeth yet, but they came outta this:

http://www.isuzugeek.org/forumpics/trooper/sadrs.jpg

:cool!: Bart

Bart, 4.56 to 4.77 is a 4.6% change.

By way of comparison, going from stock 245/70 (29.5") tires to 265/75 (~32") is about a 7% change.

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Originally Posted by BigSwede

Bart, 4.56 to 4.77 is a 4.6% change.

By way of comparison, going from stock 245/70 (29.5") tires to 265/75 (~32") is about a 7% change.

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Thanks, Swede. So you think there will be a somewhat noticeable change?

Bart

"somewhat noticeable" sounds about right...