Thread: b13 trannies question

Cryo treat the gear stacks and weld the case and have solid mounts to aid in wheel hop and it will be good for over 300tq . Choose wisely on cluch set ups unsprung discs are hard on the gears and case depending on if you run it at the drag strip alot .

I am old. I don't drag race, ever. I don't abuse the clutch. I don't have any bad driving habits. My car is NA with bolt-ons.

My original tranny lost 5th gear at about 40K, covered under extended warranty.

My Nissan rebuilt tranny lost 5th gear again around 120K (?).

I had it professionally rebuilt again, before I found the forum(s). Very, very expensive.

When it died yet again....I replaced it with a B15.

I have more than a bit of disdain for the B13 transmission, and the half-assed fix that Nissan cooked up for the B14 tranny.





Also....

Redline tranny fluid.

Andreas Miko Tranny Saver Bracket

http://www.sr20-forum.com/naturally-aspirated/11706-tranny-brackets-sale.html

Prothane or comparable motor/tranny mounts.

Proper clutch.

how about precision 6262 on 25 psi should i just go p11 because thats the turbo im using and the psi i want

thanks i wa thinking about that welding the case

arent like b15 trannies bad for turbo cuz of there close ratio that for 4.400 final must be a pain to drive on the highway

Welding the case and cryoing the gears is a big waste of time and money on a b13 trans. If you keep your rear motor mount bolts tight like they are supposed to be, have good suspension and bushings on the swaybars replaced with ES bushings to eliminate the possibility of wheel hop you wont crack the case. Wheel hop cracks the case, period. Sheer power will not crack the case at least not the power than your planning on making or that most people are making.

The gears are going to break if you throw enough at them.

There are dissadvantages to the p11 and b15 trans. They are notchy as hell, they dont like to be quick shifted at all, most of the time its like your hitting a wall trying to shift if you go anything quicker than slow on the shifts. I hated my buddies VE b14 with a b15 trans. Its really annoying especially when your racing, missing 2nd and 3rd all the time sucks.

The b13 and b14 trans shift way way smoother. Yeah they are not as solid as the b15 and p11 trans but its not that much of a difference. Even with a 6262, if your fairly easy on the trans, use valvoline 85w140 either in conventional or Durablend and use a sprung clutch disk, the trans will still last you a long time.

Yea I have heard of the shifting issues that some B15 transmissions have had. Lucky for me, the P11 trans never let me down. It shifted awesome, and never missed locking a gear unless the gear oil got too hot. That would only happen on 100*+ days after 30 drag passes or so. Even then, it was rare.

Ive driven two different b15 trans cars and one p11 and all 3 did the same thing some worse than others. You must of had a really nice fresh one then Coheed, lol. That and i know you put some low mileage QG18 stacks in your trans as well. Might have helped the situation if the syncros on all the ones ive driven were worn slightly some more than others. But 2nd gear was almost always a for sure miss if trying to shift quck. It pissed my buddy off because he was soo used to the b14 and got soo good at flat shifting with it and could no longer do that on the b15 trans.

Ashton, I do not drag race. Do not quick-shift or whatever you are describing.

I will agree that the B15 tranny is not as "snick-snick" precise and light as shifting a B13 tranny. It took an initial bit of slight adjustment. No more than if you change from a factory flywheel to an aftermarket lightweight aluminum flywheel.

At the same time, I think you are overstating the issue outside of drag racing. I won't argue drag racing with you, your area of expertise.

For daily-driving the vehicle the way you should with an SE-R, quickly, decisively, and hitting red-line, the B15 tranny has been just fine. I do not miss shifts, even when heel-and-toe downshifting (which I practice a lot) or when I am winding it out and seeing just how fast I can get up to freeway speeds.

I cannot remember the last time I missed a shift of any sort.

And I will take the durability, beefiness and reliability of a B15/P11 transmission over a B13/B14 transmission any day of the week and twice on Sundays.

I agree shawn, normal driving or even some spirited driving they do all right besides being a bit on the notchy side in comparison to the b13/b14 trans.

Im more talking very very quick shifts especially no lift shifts where your just bliping the clutch and right foot stays to the floor. The b13/b14 trans I can do that all day long with ease. The B15/P11, good luck. lol.

As far as overall strength of the trans yes they are indeed better than the b13/b14 but with the right driving ability and proper fluids and clutch you can still make a b13/b14 trans last a long time at 350-450whp. Anything more its a ticking time bomb in 3rd and 4th