Just curious what your tach sits at when cruising around highway speeds.. 75mph with your gear

i'm debating digging to a 4.10 should the tach not be too unreasonable on the freeway

 

anybody?

 

Ill tell you how mine was, i had a 01 SS went from 3:42's to 4:10's and it was about 4-500rpms higher in 6th gear at 65mph it was about 2400rpms. If you have an A4 looking to drive around town mostly 3:73's is your best bet at 75 mph i wouldnt be able to tell you exactly what rpms youd be sitting at but you would be about 7-800rpms higher if your goin from 2:73's to 4:10's. I know when i had a 95Auto as well in the past i went from 2:73 to 3:42's and i was about 500rpms higher at 65mph. If you get a programming for gears you can aso play with the gearing and make your 4th taller with a hypertech or some other programming if your worried about higher rpms on the highway.

 

Taller gears from a hypertech???? That's a first for me, how do they do that?

If you already have 3.73's and your thinking of 4.10's I don't think that small of a change is worth the cost. With that said, I love my 4.10's and A4 the rpm on the highway is tolerable. The only complaint I have is having to use overdive in the 1/4. I plan to fix thst by getting a little more rpm out of this motor.

 

I have 4.10's with an M6.

6000 RPM in 1st gear is ~43MPH
6000 in 2nd gear is ~61MPH
2000 in sixth gears ~72MPH

 

To me it would depend more on the power level your car will be at (now or eventually).

If you are staying N/A, with bolt ons like you have, or even to upgrade the motor with a H/C/I combo, then I would say 4:10's all the way.

If you plan on spraying the car, or going the Forced Induction route as I did, then 4:10's will be too much and you're car will be all over the place. At that point 3.73's will be your best bet.

 

On my 95 auto i was widening my gears by adding MPH by using the hypertech. You can + or - mph in each gear.

 

What are you talking about ?? The only thing that remotly comes close to mind of what you are trying to say is that you can change the RPM your car shifts at with a hypertech programmer in an auto.

 

Call911 i was adding MPH in each gear you can add up to 11+mph per gear to make it wider or deduct 11mph. And again like i said in the last post 95Auto all i was doing is giving my experience not trying to get bashed for no reason.

 

I didn't mean to bash you. But I still fail to see how a hypertech programer can add or deduct MPH in a gear when that is something mechanical (in the gearing of the tranny, and the rear end). I can see how it is possible to adjust your computer in thinking it is going 11+ or - MPH faster or slower than it actually is, but you would still in reality be going the same MPH, your speedo would just be inacurate.

Maybe I am not understanding you completly. Honestly I didn't mean any offense. Does what karpetcm5 is saying make sense to any one else? Maybe its just me

 

I know were your coming from but i was specifically adding mph up to 11 mph on the hypertech for each gear. I didnt know that feature was there till i had bought the hypertech mainly because i wanted to buy the thing for my gearing, top speed and rev limiter changes ofcourse it does other things as well. I do remember in doing so meaning adding MPH in each gear unless you add the same MPH in each gear it would bounce of the rev limiter before shifting. When i say add same mph if you add 8mph in 1st then you have to do it in all the gears atleast for me because then it would bounce of the rev limiter before shifting maybe needed to also adjust my rev limiter but as soon as i added 3-4mph in each gear problem went away then the rev limiter i had which was raised to 6200rpms. This was 8 years ago so dont know all the specifics ive had 3 camaros. Now maybe i was fooled to thinking by it giving me the option of adding MPH in each gear and raising my rev limiter it seemed like it was wider because i never wrote down what mph it changed from 1st to 2nd to begin with. There is an option called Trasnmission shift points, its not Rev Limiter or Speedometer/Odometer Correction with in the option of Transmission shift points it gives you the option of adding or deducting MPH up to 11mph and it'll tell you 1st gear and on up. i wish i can find a pic of this on a hypertech to paste here but thats not gonna happen cant find a pic of it. Again i didnt write down what my shifts points were prior to adding MPH in each gear and then seeing if it shifted later meaning the gear was wider.

 

I understand what you are trying to say, but there is no way in my mind that this is possible as it is not something you can change from programming. Your MPH is gearing in the tranny and rear end (MECHANICAL). You could change your MPH as far as the computer goes, but that won't change the actual MPH, your speedo will be off is all.

 

I know I don't.

Are you talking about changing the shift points maybe?

 

LOL nevermind, i wouldnt be able to explain it any better then that unless i had one in front of me again and video taping how it works. I guess when it gave you the option to add or subtract MPH your changing your shift points but the only way to prove that you can add mph or subtract is to actually show it because no one believes me. But like i said before i didnt write down what it shifted at before meaning (example not actually shift points) 1st to 2nd at 42mph then i add 3 mph and it shifts at 45mph im not saying that i wrote it down and thats what it did because i didnt look at it i just assumed since its asking you to add up to 11mph per gear youd be widening your gears by that much, again this is for an auto tranny not an M6 id assume if you have an M6 that option wouldnt be relavent and would not be available on the programmer once it recognized you have an A4 just like shift firmness is irrelavent on an M6. Thats what i remember either way but for the sake of not butting heads ill agree with you and say im wrong because this was 8 years ago and since i have no proof of it cant really argue the point either way or make a point, no hard feelings.

 

I think he is correcting his speedometer , lol ... correcting for gears IF he had replaced them ; there is no performance gain there ---