need rb help what can i do about it

[araelzx2]

hi i just got done with my swap and today i was driving and in 3rd gear my car only does like 60 miles at 6500rpm any ideas why my gears are too short anything i can do about it

[SullivanRacing06]

yes change the rear end out to change the final drive ratio, the ka n rb20 transmission r the same or very similar ratios in their trannys

[Carl H]

because your stock tachometer is not calibrated correctly.this is not a gear ratio but an electrical issue.

[240z4u]

Is your speedometer calibrated to read properly? How about your tach?

If so, you definitely don't have a stock diff.

Evan

[araelzx2]

i have and rb25det s1 with rb25 transmission with stock diff the speedo i dont know if is right the tach is good but i can tell the gears are to short

[araelzx2]

would it help if i get a j30 diff to get longer gears

[Carl H]

how can you tell the gears are short...these engines sound like they're revving higher than they are.i highly DOUBT you are almost at redline in 3rd doing 65 and seriously think its your tach.you could swap out differentials and make your life harder but why bother if its just a uncalibrated tach.

[araelzx2]

the how can i calibrate the tach to me it looks fine today i step on it second gear only does 45 miles at like 7k

[240z4u]

LOL @ this thread..

Do some searching. I don't even know if there is a differential with short enough gearing to have you at that engine speed and wheel speed.

Evan

BTW; the gears DO feel short, nature of the beast with the rb.

[gawdzilla]

Rev it in neutral until you hit the rev limiter. Where does it read on your tach?

If you have not calibrated your tach, it will read 1.5x higher than it really is. so when you think you're at 7k, you're really at ~4.6k. search some and you'll find how to recalibrate the s14 tach.

[araelzx2]

i rev tha car and it went pass 8k im i didnt hit red line this is weird

[Carl H]

its not weird, its a miscalibrated tachometer.

[ANVIL]

i rev tha car and it went pass 8k im i didnt hit red line this is weird

LOL

have u not been reading the thread? your tach is calibrated for 4 cyl. you need it recalibrated for 6. if u ask nicely carl might help u out or you can go to lsauto.com

[runaway3087]

my car does the same thing the tach is way off. it revs to the end of the tach its like at 12.

[240z4u]

My car goes to 11

[runaway3087]

hey dude do u think u can help me with my problem? i need a good place to take my car it really needs some help because it was from NC and now im in south dakota and need help with the climate change.

[Carl H]

not sure who you're talking too specifically but shoot me an email at blackboxtuning (hiiizzzat) gmail.com