Supercharged NSX

[710]

Thanks Kevin this is a good link, I’ll keep it for when I need it. You are right about the pistons and rods being on there.
But $3600 for rods when we have plenty of rods right here in England (UK, the Capital of Racing Stuff) and pistons $3000 too. And those are the production series prices, if the acralite pistons were a standard product as are the Toda ones on the site, they would be about $1200 here, rods from Farndon $1500. Even as special one-offs, they are cheaper here. Probably better too. whew, what a price difference! Anyway, thanks, it’s a good link with tons of cool stuff. Did you see the picture of their engine (of course it has an extra pair of cylinders…)?
peter

[AR]

Maybe if we could get a few of us together we could then get a discount the comptech kit and find a good mechanic to install it. I wonder how many would be needed for a discount ???

[Kevin]

Peter:

I was going to say the UK is the centre of world motorsport, but I guessed you knew that already.

You're right regarding price and expertise. However everything done here will have some element of development involved.

My harness bar was specially made, but even so came out cheaper than getting one from the States. The thing to do is go to real motorsports places/fabricators and not the suppliers/motorsports wannabe's that advertise in the glossy magazines.

I'm sure any decent engine builder here can fit the cams/sleeves and pistons required, once the parts have been sourced.

Did you contact Quaife about a LSD?

[710]

Kevin,
Quaife; yes, they can do 10-off @ about £500 each I think. It was a while ago and I don’t have the prices in front of me, but it was about the same price as all the other diffs from Quaife. They said they needed an example from an NSX though. They said it should be no problem for them.
The Mugen one is about £3000 and it’s a plate type. The Quaife diff would be a TorSen type, which I would prefer because I’ve got that type in a couple of other cars and had only good results (including the rally car).
Peter

[ctrlaltdelboy]

I have this diff in my car

it's great!!

reviews here

http://www.nsxprime.com/forums/showthread.php?t=36003
http://www.nsxprime.com/forums/showthread.php?t=39249

[Kevin]

I know the OS Giken LSD is out there, and you have one. However Quaife is Quaife. Hundreds of racing cars with Quaife LSDs can't be wrong. I thought the OS LSD was a bit over priced, though it does include a new R&P.

I wonder if the a Quaife diff from another Honda will fit the NSX.

Darren do you still have your old diff?

[ctrlaltdelboy]

agreed, the OSG is not cheap, incidentally, the 4.4 final drive is actually part of the diff itself rather than a bolt-on ring.

had I not already done the OSG and a good diff came up from quaife at this sort of money I would probably be going that route.

my old diff is inside my old gearbox on a pallet to go to Dali for recycling.

[710]

That sounds like a good package, with the 4.4 crown and pinion too! And I notice the price has come down on the short gear set too. Hummm…
Good links too, thanks
Peter

[710]

I wonder if the a Quaife diff from another Honda will fit the NSX. Darren do you still have your old diff?

Quaife are very reasonable, they explained that if, after inspection of a stock NSX diff, if a similar Quaife diff already exists from a different car (Honda or otherwise), they would use that. And the price may come down, or at least they wouldn’t have to make 10 of them…
If someone posts a stock diff to them, they will measure it and make a quote. They will know then if a new diff needs to be made, or if they can use parts from a different one. That’s the only way things are going to happen, really, because no one has any technical drawings of a stock diff. If someone posts their stock diff to Quaife, I will make the payment for production and sell the first 10 on to you. Production of more after that is possible too.
Are all the available crown gears the same bolt pattern, or do I have to put extra holes in there to match all possibilities? For example, do some Japanese manufactures of LSDs have their own crown/ring gear bolt pattern?
After measuring, we will give your stock diff back to you. Put your name and details on it, and attach my name to it if you want, they know me. I also have an appointment with them on the Monday 15 August 2005 about something else. So if the diff arrives there before then, I will discuss it with them and then we can get some concrete info.
I would also like a diff, because just this weekend I was skidding on the grass (stock NSX). I was surprised how much it skidded, and how easily I got stuck on the grass. And my car/diff only has 50,000 miles on it. I believe plate type LSDs must be adjusted periodically because the clutch plates in them wear. Does anyone know how periodically?
Beware, though, that the Torsen diff (Quaife uses that design) does not lock up 100%. It will slip if one wheel is completely without grip (like if the wheel were in the air, but applying a little friction from the ground or the brakes slightly would make the diff function again). But on snow it seems to grip and function like an LSD. My rally car will climb out of anything with the Quaife diff, even ditches where one wheel is in the air so I don’t know what’s going on there. They have always worked for me, even on really slippery surfaces. They seem to be smooth and don’t upset road driving/drifting etc. and they don’t jerk or snap.
I get the idea (through hearsay) that they are smooth in comparison with a plate LSD that may suddenly engage, this sudden engaging would not be good on the street during a drift. Is this true? Although I have heard plate types are quite linier, so that’s good.
Does anyone else have thoughts/experience about the Torsen (Quaife) diff compared to a plate type diff? I have heard that a plate type diff can be set “tighter” and because of it’s design, will never let one wheel spin free, but that for street, they must be set more loose otherwise they introduce too much friction (equals tyre and petrol consumption) when turning sharply in town. I believe that’s why the stock NSX diff is set so loose. Tightening it would introduce understeer too. The Torsen (Quaife) never locks, so can’t introduce understeer. Also the Torsen diff has no clutches or plates to wear. It is 100% mechanical so won't need to be adjusted and won't change characteristics through time.
That’s about all I know about diffs. Shall we go for it? Are there 10 people out there to help me recoup my investment costs?
Peter

[Paul_dc2]

Who's up for contacting Jenvey Dynamics for some ITBs?

Jenvey would be my personal route in tuning one of these beasts.

Im currently running a set of Jenvey's on my DC2 in conjunction with an AEM standalone ECU. I would have thought, well I know the ECU is good enough to power a V10 so a V6 should be ok. Can you imagine the noise 8), I also put a reverie carbon airbox to help things stay cool.

All I need is the NSX, its coming, just got to find a good one for the right price.

I will get around to my newbee post honest :wink: