A couple questions

[Ceezer]

I think I'm going to go ahead and put a moderate lift (3-4") on my Tahoe and replace the wheels & tires. It's currently running 265/70/16s which I figured to be about 30.8" diameter. I was trying to picture it in my head and I think with the lift that 31s (or stock) will look puny but 33s might look ok.

 

I'm told that a lot of 33s are only offered for a 15" rim but I could probably find more tires in a 33" by looking for a standardized size. 33" on a 16" rim would be 17" of tire, so that's about 432mm which is 216mm of sidewall. Playing around with some numbers, a 315/70/16 would come pretty close -- assuming they make a tire in that size. I guess a wider tire would put a bigger patch on the ground for more rolling resistance. I wonder if that would have much of an impact in fuel economy?

 

I think I'm running a 3.73 final gear ratio (01 Tahoe LT 4WD), so would that be enough to turn 33s or maybe even 35s without any hesitation or extra strain?

 

My second question is about power programmers (once I get a few other upgrades done). So far, for my engine, I've found the: Superchips Flashpaq, Hypertech Power Programmer III, and Jet Chips Power Programmer. Then I found the Granatelli Predator Flash Series Engine Programmer. Is the engine programmer the same thing as a power programmer? I only ask because they were listed as 2 different categories on the same web site. And is there a distinct difference between them, or do they all pretty much do the same thing? Would they be able to reprogram the speedometer to account for an increase in rolling circumference on the new tires?

[Superchips Tuner]

I think I'm going to go ahead and put a moderate lift (3-4") on my Tahoe and replace the wheels & tires.  It's currently running 265/70/16s which I figured to be about 30.8" diameter.  I was trying to picture it in my head and I think with the lift that 31s (or stock) will look puny but 33s might look ok.

 

I'm told that a lot of 33s are only offered for a 15" rim but I could probably find more tires in a 33" by looking for a standardized size. 33" on a 16" rim would be 17" of tire, so that's about 432mm which is 216mm of sidewall. Playing around with some numbers, a 315/70/16 would come pretty close -- assuming they make a tire in that size.  I guess a wider tire would put a bigger patch on the ground for more rolling resistance. I wonder if that would have much of an impact in fuel economy?

 

I think I'm running a 3.73 final gear ratio (01 Tahoe LT 4WD), so would that be enough to turn 33s or maybe even 35s without any hesitation or extra strain?

 

My second question is about power programmers (once I get a few other upgrades done). So far, for my engine, I've found the: Superchips Flashpaq, Hypertech Power Programmer III, and Jet Chips Power Programmer. Then I found the Granatelli Predator Flash Series Engine Programmer. Is the engine programmer the same thing as a power programmer? I only ask because they were listed as 2 different categories on the same web site. And is there a distinct difference between them, or do they all pretty much do the same thing?  Would they be able to reprogram the speedometer to account for an increase in rolling circumference on the new tires?

 

<{POST_SNAPBACK}>

 

 

 

SC products will recalibrate for tie height changes very easily. Just measuring from the ground to the top of the tire within 1/4" increaments.

Ron

[asilverblazer]

3.73 gear ratio should run a 33" tire easily enough. Factory size is close to 31 1/2" I believe.

[Ceezer]

33s are what I was ideally looking for, but thought I'd ask about 35s since it's been difficult finding some decent 33s to fit a 16" rim.

 

Any other differences between the programmers?

 

Thanks for the help, fellas.

[Ceezer]

Also I was wondering if I'd need to put a lift on before being able to fit 33s on. Is the turning radius of a 33" tire too tight for stock ride height that could lead to rubbing? It looks like there's plenty of room there but I thought it's better to be safe than sorry.

[Ranger]

If you run a metric converter, a lot of LT sizes come out to be 33. My 285/75/16 BFG A/Ts come out as 32.8x11.2x16. Course, I have a 2500 HD so not sure about fitment in your case. Mine doesn't rub at all after a minor fenderwell trim. Scrubs a little bit at full compression but only when offroad.