i'm gonna be boosting my y8 with 60k miles here soon - nothin too serious (for now ) maybe 5-6 psi from the apexi kit.

already, my tranny is grinding when i put it into third (previous owner was a young woman, plus i did my fair share when i first got it) - it's getting worse everyday. i want to just replace it.

i'm considering either a new y8 tranny ($200) with a quaife lsd ($800), OR a jdm d15b with the lsd already in it ($3-500).

i did some reading on the d15b tranny. it does have the exact same gear ratios and final as my y8 tranny. since it's older, i assume it has aluminum shift forks instead of steel. can anyone confirm this?

i wasn't able to find too much information at all about the lsd itself though. one person said it's a clutch type, wears out quickly, and doesn't work all that well to begin with; but, i'm not sure about his credibility. so do any of you guys know anything about the lsd in this tranny?

correct me if i'm wrong but, if i go with the d15b i'll get a tranny with the same gear ratios, an lsd (of unknown quality), and sacrifice my steel shift forks (no big deal) for <u>half</u> of what it would cost to replace the y8 with a new one and a quaife.

sound good? what do you think? am i missing something? is it worth it or should i just save for the new y8 and quaife?

thanks guys

 

get the JDM one its cheap and just as good

 

how do you know that? can you back it up? or are you just saying that because it's jDm y0?

i just want to be 100% sure i know what's going on before i **** more money away..

 

bump for you.....I'm curious to know.

 

stock diffs are weak.....

the quaiffe is a MUCH better diff, as well as the Kaaz

go with the quaiffe though...lifetime warrenty and under $800 shipped now

 

i kinda forgot: the d15b tranny is going to be older, and it will likely have seen more abuse. but for half price.........

you say the stock diff is weak. how so? again, can you back that up?

also, the kazz lsd is a clutch type: it's a great adjustable diff, but it will require a rebuild almost every 20k miles. no way in hell i'm doing that. it's more for track ****** than guys like me. the quaife is a gear type, and more practical for a daily driver, as it never needs rebuilt (hopefully ).

 

JDM D15 tranny

 

The Y8 tranny with Quaife would be much stronger and have the lifetime warranty on the Quaife, and the JDM D15B would be weaker and have no warranty, but on the other hand it's cheaper. If you can afford the Y8 and Quaife go for it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RLZengineEJ6 &raquo;</TD></TR><TR><TD CLASS="quote">
go with the quaiffe though...lifetime warrenty and under $800 shipped now</TD></TR></TABLE>

That's why I would go with a Y8 transmisison with a Quaife.

 

 

The D15B is a viscous diff, so will only act as an LSD and transfer power across once one wheel is spining up. So not so hot for road use, as generally you dont want to be spinning up tyres to get the benefit, which is where a Quafie diff will be better. IMHO the quaife/torsen gear diffs are one of the best FWD road diffs, as they limit the amount of wheelspin, and maximise available traction. They do take getting used to, as you will get torque steer effects, as they tend to turn you in towards the apex harder (outer wheel has more torque, so creates a turning force), so require less steering input than an open diff. However they do have drawbacks, they arent used for racing, as they are very inefficient and generate a lot of heat, ok for road and light track use, but not great for 1hr+ as they will be active a lot more in racing situations. Its also not adjustable, however its a bit of a false statement, as the design means it actually gives a variable torque bias ratio up to a maximum, so is sort of self adjusting all the time

The D15b viscous unit (same as the DC2 GSR i think) is better for track and drag use, and if i am correct in thinking it shares the gearbox oil, wont have overheating issues.

Clutch diffs are somewhere inbetween, offering a lot of adjustability, but limited consistency and need regular rebuilds.

None of them are necessairly 'stronger' than each other, but the quaife unit is probably designed with higher torques/power in mind than the D15B box, so would be the better choice if your going FI

In all the quaife unit is better for road use, and worth the money, the D15B LSD, fine if you want to save the cash and have an easy life and limited wheelspin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slammed_93_hatch &raquo;</TD></TR><TR><TD CLASS="quote">get the JDM one its cheap and just as good</TD></TR></TABLE>

i say this because you get a tranny with the exact same gear ratio, and LSD for under half the price and if and when the time comes you can buy a new one.

you said you might run 5-6 psi with an apxi kit, now you aren't gona be pushing that much hp (under 200). Now i don't know what the stock LSD will handle but i still say go with the 15b tranny, you pay under half the price and you get LSD, so again when and if it goes you can just replace it with a new unit. and you would only be down $100 or so.

 

slammed 93 hatch & CivicESi : thanks for those great responses. you guys kick ***.

i think i'm probably just gonna get the d15b. a new tranny with a half decent lsd for 500 bucks sounds great. hopefully i can find one... and one that is in good shape.

i don't think i really need a quaife yet. i'm not gonna be doing any serious racing right now - maybe just autox on some weekends for the hell of it, but that's it. right, i don't expect to get over 200whp, so the the d15b should be good enough.

thanks again guys

 

i already got a perfectly working Y8 tranny, would it be cheaper for me to just buy the lsd off of a D15b tranny and put that in... if at all possible... ?

 

keep in mind the D15b is rahter rare, if i remeber correct. good luck getting a good price on one.

 

Hmotorsonline.com sells the D15b LSD tranny for $350 + shipping..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slammed_93_hatch &raquo;</TD></TR><TR><TD CLASS="quote">

i say this because you get a tranny with the exact same gear ratio, and LSD for under half the price and if and when the time comes you can buy a new one.

you said you might run 5-6 psi with an apxi kit, now you aren't gona be pushing that much hp (under 200). Now i don't know what the stock LSD will handle but i still say go with the 15b tranny, you pay under half the price and you get LSD, so again when and if it goes you can just replace it with a new unit. and you would only be down $100 or so.</TD></TR></TABLE>

What is the rebuild part availability going to be here in the U.S. where there has NEVER been a D series factory lsd... I'd think getting ANY parts for that would be next to impossible... I don't know, but that's what I scared me off of this tranny...

I'd love to hear some first hand experience with this tranny and how good the dif. is and how available the parts would be if a rebuild was needed...

Also if the parts are available, as mentioned why not just get the d15b dif and put it in your existing tranny... if it has problems even better... you could get the dif installed while you either rebuild it or have it rebuilt...

I don't know the answers to any of the questions I've asked... I'm not getting on anyone's case... just curious...

Also to the poster... have you done anything yet? If so what and how'd it work out?

 

I'd get the Y8 with a Quaife. Quaife ATBs are beefier than OEM Honda diffs, and have a lifetime warranty regardless of what you do with the car.

Not to mention you can replace your synchros, bearings and whatnot while you have the tranny apart - sure it's pricey, but you'll basically have a brand new tranny, vs. a used JDM POS with potential grinds, potential aluminum shift forks, and an unknown LSD.

And to whoever's post I read it in, the OEM Honda LSD is NOT a viscous unit. I have only ever seen clutch-type and gear-type LSDs for Hondas.

 

wow up from the dead.

i decided to spend the extra money on the y8 with the quaife: i found an amazing deal on a quaife, and when i considered the price of the old, near impossible to rebuild, and weaker d15b tranny - which has a weaker and less effective differential than a quaife - spending the extra 300 bucks was more than justified.

still looking for a newer y8 tranny though... i know you have one and want to sell it to me

 

Did you try putting synchromesh friction modified in your car and seeing if that gets rid of the grind?

 

yep... didn't do **** i'm just gonna buy another one, and have the one thats in there now as a spare. i'm going turbo here soon, and i'm sure i'll break a couple trannys.

 

I switched from a y7 tranny to a y8 w/quaife and I love every minute of it. I would go with the y8 quaife.