3.538 Final Drive too tall for CA powered 240?

[nextlevel]

just curious I can get a 92 Q45 VLSD for pretty cheap, contrary to what many say some Q45 VLSD's were R200 not R230 as many say, only thing was final drive ratio was 3.538 compared to the 240's 4.08, CA will be mostly stock only mods wouldbe 3" all the way back from the turbo, eventually I'd like it to be mid to high 200's whp, so what do you think should I go for the Q45 VLSD I really dont care that it will give me a higher top speed as I dont plan on driving that fast, but will the 3.538 make the 240 a total dog while accelerating?

[quest]

I think that gear might be a bit too tall for our low torque 1.8L to pull in a relatively heavy car - in a corolla it'd be perfect tho. 3.5 would put more load on the driveline too.Some uk guys have switched to the taller geared s14 diff. Maybe u can find how their ca responded first hand, on their forums.Would be a nice gear for a turbo 6 cyl s13 imo

[r34 gtr]

im interested in how it would respond to a CA with the stuff in my sig. on it. i really would like a taller final drive, my car kills itself at high-rpm highway driving. if not, what other nissans use the r200 rear end? and would i ever be able to make a s15 helical rear end fit on my car?! aaargh! the questions keep coming!

- tim

[biosehnsucht]

s15 internals can swap over but you need those magical output shafts that no one can get ahold of

[nextlevel]

r34 gtr I'm considering selling it I think it may be a bit too tall for my liking, pm me or e-mail me at [email protected] if your interested, looking to get about $250 for it, all you need is output shafts, let me know

[Rex]

There's a BRM deal to swap 4.08 gears into Q45 rears, but it's like $800 plus your core & shipping. That doesn't sound like an affordable solution, versus what a VLSD would/should cost you with the gearing you want??

[nextlevel]

yeah for $800 I'd just get a clutch type 2 way, not really worth spending that on a vlsd imo, I might try it out and see how it is if no one wants to buy it off me,

[Dystopia]

also the q45 uses a r230 diff

[nextlevel]

also the q45 uses a r230 diff

Actually it doesnt, as I originally said, I did some searching on this and found a thread about it on freshalloy, One of the Q45 guys looked it up in the FSM and found it was an R200 NOT R230 as many say, the Q45 did however go to R230 eventually, but I know for sure that the 92 Q45 used R200

[Jezz_s13]

the uk S14 VLSD is 3.692 and is what I'm running on my CA S13, i don't think it's too long but depends what you want from your car, i want top end. I think the UK gearbox is longer than the JDM one too.

[nextlevel]

hmm interesting, I'm still debating what to do with this diff, I would mostly be using the car for Drift/Grip, and occasionally straight line racing, what mods do you have on the CA?

[float_6969]

If I wouldn't go much taller than the stock. The CA is a small displacement motor and depends on those high revs for power. If you're real worried about it, steal the 5th gear out of a KA transmission and swap it in. That should help drop your cruising rpms but not effect your acceleration in the other gears.

[quest]

u know, u can calculate the difference and try a taller tire to simulate the gear change, before u go thru all that and find out its not what u want..... cheaper way

[Jezz_s13]

what mods do you have on the CA?

A few.Specs are here...http://www.sxoc.com/site/rides...ID=88

It's running at the last count 322bhp - 290ft/lb @ fly. That's in UK BHP, or about 400US bhp. LOL

[quest]

jezz,what do u mean the box is longer, thats physically ? or gearing wise.I have a uk and a jdm ca18/5spd

what is this uk bhp to us hp difference ?Lotsa us guys have backed up hp claims via quarter mile runs

u made 322bhp? on a t3/4 ? what boost ?nice car

[Jezz_s13]

I mean the gearing is longer, I've just had a look and it's only 5th that is longer on the europe box, but the europe diff is 3.92, and everywhere else is 4.36 Do you have the FSM?

Quest, the power thing was a piss take.

It's a T3 .48 A/R turbine with a T34 0.6A/R compressor in T04 housing running 20psi. Power is restricted by the std manifold. i can run 2 bar and still get the same power. Just melt my head LOL.Balls out it's a 400bhp turbo.Needless to say (along with the rest of us) I am waiting for my manifold to be built.

These look interesting though, not sure if they are SS (erk) or not though..http://www.sxoc.com/vbb/showthread.php?t=90558

Cheers.

[quest]

if a 3.69 is ok, the 3.58 may very well work out fine.Seem like the uk gbox may be the same as the KA 5spd. Got both side by side so I may 'turn' em in 5th to verify... may be able to spot the difference.I had someone download fsm a long time ago that had parts missing so I never bothered using it anymore. I have to get a different copy (I'm still dialup).

yeah, not a good thing to try squeeze 300+ hp thru the restrictive stock exhaust manifold

That header looks great but seem like the same inexpensive ones sold in the u.s. that some folks have cracking problems with, while others haven't. a couple KA guys are hacking up the cheap $150 sr headers and welding them to their ka flange. Some add t3 flanges - they're working very well believe it or not! Probably can do the same for the ca18 if you're crafty. A flex section and a brace *might* solve the cracking issue See pacesetter making hella cheap dsm manifolds too. sr next? ca most likely never lol