Jump to content
SAU Community

Rb26 Conversion In S15 With Auto Diff

toy515

By toy515,
in Engines & Forced Induction

 Share

Recommended Posts

toy515 Grand Master

toy515

Posted
Posted

hey guys i have a s15 with a 26 conversion but the diff is from a standard s15 auto i think the diff gears are 3.9 would this affect what power i make im looking to buy a gtr diff soon but just wondering would the auto diff affect the power output also im using a rb25 gearbo if that helps

cheers

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted
hey guys i have a s15 with a 26 conversion but the diff is from a standard s15 auto i think the diff gears are 3.9 would this affect what power i make im looking to buy a gtr diff soon but just wondering would the auto diff affect the power output also im using a rb25 gearbo if that helps

cheers

Final drive ratio makes no difference whatever to your power output. Are you happy with your present gearing or do you want lower for more acceleration or higher for quieter cruise and economy and maybe top speed? Those are the only reasons to change your diff (unless you want a LSD).
bubba Grand Master

bubba

Posted
Posted

3.9s might be a bit tall for teh 26, but the S15 is a pretty light car isn't it? All it's really going to affect is how fast it comes on boost (i.e. if you have a huge laggy turbo then tall ratios aren't for you).

I'm running 3.9s with my 3L but I've got the torque to deal with the taller ratio.

den001 Proficient

den001

Posted
Posted (edited)
3.9s might be a bit tall for teh 26, but the S15 is a pretty light car isn't it? All it's really going to affect is how fast it comes on boost (i.e. if you have a huge laggy turbo then tall ratios aren't for you).

I'm running 3.9s with my 3L but I've got the torque to deal with the taller ratio.

3.9 tall???

whats a gtr diff ?? as i also ahve a 26 in my s15, but i run a GTR diff and 25 box, i thought the gtr diff was 4.11:1 isnt this taller???? its the same gearing in a gtr isnt it?

Edited by den001
R31Nismoid Grand Master

R31Nismoid

Posted
Posted

GTR's are 4.11 or 3.9, it escapes me. R34's are 3.45 or so due to the different gearing in the 6 speed.

I think ive got 4.3's... i wish i had 4.11's or 3.9's.

VL/R31s factory are around the 3.45 if memory serves me correct... i wouldnt call 3.9 tall, its still fairly short in terms of a small step from factory

The above could be wrong :ermm:

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • TommyR34
      GTR R34 number plates up for grabs

      By TommyR34 · Posted

      bump
    • Murray_Calavera
      Stock rb25det neo questions

      By Murray_Calavera · Posted

      If you are genuinely considering trying to get this engineered, I would strongly advise finding the engineer that is happy to sign that off first before you put the hole in your car.  I've seen cars get defected for this and not be able to be put back on the road as no engineer they spoke to was happy to sign if off.  
    • Wazmond
      Stock rb25det neo questions

      By Wazmond · Posted

      Apologies, while id like to put the MAF as close to the TB and relocate the recirc, this may be too much work. Will most likely end up just putting it on the original AFM spot ( onto/next to the airbox ).  Was going through nistune, found a pretty nifty doc on this. Nistune MAF Notes. Also, i was looking through the bay, and there seems to be a tube/line connected from the A/C to the intercooler piping ( Between the smic and the recirc), what does this do as the crossover fmic piping doesnt have any connection? plumbing? not sure what you call it but the nipple thing ahah.  Also, been reading up more about crossover fmic in regards to the legality of having the hole drilled for the piping, this would most likely need to be engineered right?
    • joshuaho96
      Baron's R34 GT-R build thread - car in Japan for 5 years -_-

      By joshuaho96 · Posted

      My advice is if you need a big build done do it in Japan. The yen rate is so favorable and there are shops that can be genuinely trusted and not micromanaged/carefully monitored every step of the way. Garage Yoshida is obviously my preferred option but they're so busy these days and all interaction with new customers has to be mediated through BBL/Toprank now. 
    • Duncan
      Car Rotisserie

      By Duncan · Posted

      I haven't....but a poorly made one would terrify me. Surely a good second hand one is the go, as they don't work hard and no-one wants to keep one after they are finished with it A big consideration would be the weight of the shell you are putting on it....is it a fully dressed chassis or just the body
×
×
  • Create New...