Jump to content
SAU Community

Recommended Posts

I see there are a few people commenting who actually don't have any experience with either a lightweight flywheel or tail shaft.

Neither the lightweight flywheel nor the tail shaft cause drivabillity issues.

Thats from experience.

Keep thinking about it. and then ask someone who builds race cars.

This is a bit off topic I guess, but.... how can you say a lightened flywheel doesn't cause driveability issues. You could say that in your case (and probably many other cases) it hasn't. But, if you are passing on accurate information to those who haven't had experience, then you should add that a lightened flywheel "can" cause issues. Consider the basic physics. Using an extreme case to illustrate the point - If there were no flywheel the engine would have very little momentum and trying to get the clutch out (from a standing start) without stalling would be nearly impossible.

Things that will affect whether driveability is impacted by a lightened flywheel are:

1. How much lighter the flywheel is, and

2. What type of clutch you are using

I have a 5.5kg billet flywheel and a fairly bitey 5 puck clutch and the difference is quite noticeable. It is a track car, so I don't care. I personally would not use the same configuration for the street, as I would find it annoying to use in traffic.

  • Replies 119
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

I have just got info back from Jame Martin the product manager at ACPT.

They have off the shelf designs for R33, R33 & R34 GTR tail shafts. The price including shipping to Australia is $2,160 Aussie dollars for just one, I am sure we can get it a tad cheaper again if we group buy.

This makes it half the price of the jap units and more than attractive enough as a modification when you consider that there aren't too many mods for $2k that are as good as the accelleration you are going to pick up from one of these bad boys.

I shouldn't go on but the mines  R34 is equiped with carbon tail shaft and it is quite a big reason behind the 'response' of the car.

Here is one test of a rotational mass reduction on a V8 setup, the big thing to note is the massive reduction in time taken to achieve both maximum horsepower and torque once weight is taken out, that boys is accelleration increases. Note this is taken in 4th gear under load.

http://www.vetteweb.com/tech/0407vet_flywheel/

Group buy anyone ? :D

id be in that group buy for sure!!!

This is a bit off topic I guess, but.... how can you say a lightened flywheel doesn't cause driveability issues.  You could say that in your case (and probably many other cases) it hasn't.  But, if you are passing on accurate information to those who haven't had experience, then you should add that a lightened flywheel "can" cause issues.  Consider the basic physics.  Using an extreme case to illustrate the point -  If there were no flywheel the engine would have very little momentum and trying to get the clutch out (from a standing start) without stalling would be nearly impossible.   

Things that will affect whether driveability is impacted by a lightened flywheel are:

1. How much lighter the flywheel is, and

2. What type of clutch you are using

I have a 5.5kg billet flywheel and a fairly bitey 5 puck clutch and the difference is quite noticeable.  It is a track car, so I don't care.  I personally would not use the same configuration for the street, as I would find it annoying to use in traffic.

I know and I understand what you are saying.

Sorry I do need to clarify;

1) IF you own an RB powered skyline

2) IF your flywheel is heavier than 3kg, My friends and I have had one a good kilo lighter than yours and it's traffic behaviour is like stock.

3) IF it has been correctly balanced from manufacturing

Satisfy these and generally what I said is absolutely true.

Your 'puck' clutch is your problem it has nothing to do with the flywheel weight of 5.5kg. They (puck cltuches) are always either 'on' or 'off' with the slight exeption being if they have a sprung center.

Hi Guys

When I was talking with ACPT last year about making me one of their carbon shaft's

they could not tell me if there shaft could take the power that my car was putting out.

Mario also posted on the UK GTR site saying that he had snapped 2 of the ACPT

carbon shafts on hearing this I did not order from them in the end.

The Carbon shaft on my car is made in the UK by www.ctgltd.co.uk

If you look on my site I have a group buy set up www.keithcowie.com

I have not had a chance to try the propshaft on the drag strip yet

but they say that there carbon shaft is miles stronger than the std shaft

S2020007.jpg

S2020001.jpg

S2020008.jpg

S2020005.jpg

S2020006.jpg

Hi Guys

When I was talking with ACPT last year about making me one of their carbon shaft's

they could not tell me if there shaft could take the power that my car was putting out.

Mario also posted on the UK GTR site saying that he had snapped 2 of the ACPT

carbon shafts on hearing this I did not order from them in the end.

The Carbon shaft on my car is made in the UK by www.ctgltd.co.uk

If you look on my site I have a group buy set up www.keithcowie.com

I have not had a chance to try the propshaft on the drag strip yet

but they say that there carbon shaft is miles stronger than the std shaft

I wonder how I would go about fitting one to an R32GTST?

Something I have never done, tried fitting a GTR tailshaft to a 2wd gearbox.

Damn, I feel a measuring session coming on.

:blink: cheers :)

At over $2500 plus duty + freight he can keep em....over $3000 to knock 10kg out of a car...i just removed 105kg...thats nearly worth $32 000.

good point, duty would be a killa, i think its about 10 or 15% of the value of the idea plus some other stuff :)

Might as well buy from some japan dealer and get them to put its a gift and mark the price as only 12,000yen so it doesnt get tax :blink:

At over $2500 plus duty + freight he can keep em....over $3000 to knock 10kg out of a car...i just removed 105kg...thats nearly worth $32 000.

Is that 105 kg of rotating weight?

You really need to compare the cost per KG in reference to say, wheels.

Would you spend $2,500 to save 2.5kgs per wheel?

Doesn't seem unreasonable to me when compared to the price of a set of Volks.

:blink: cheers :)

Might as well buy from some japan dealer and get them to put its a gift and mark the price as only 12,000yen so it doesnt get tax :blink:

Not such a good idea if it snaps :)

• Mass 5.9Kg saving over 10Kg

• Failure load in excess of 4000Nm

• Utilising lightened LJ109 CV joint

• Heavy duty 1310 series UJ

• Machined from billet yokes

The price i got from ACPT was the same price as the one fitted to my car.

Then i had to transport it in from the usa and pay the duty on it.

they also wanted my old shaft so that they could cut off the ends then

fit them to there carbon shaft.

Keith

Edited by keith cowie

I'll make some more inquiries with ACPT but, they indicated a supplied shaft to my door without any measuring, they have already done R32,33 and 34 shafts so they don't need to remeasure them.

As for duty is the US free trade agreement is good for anything?

DiRTgarage,

You didn't just have a few beers before you typed that one? :P

Keith,

Sounds interesting.

I wonder how I would go about fitting one to an R32GTST?

Something I have never done, tried fitting a GTR tailshaft to a 2wd gearbox.

Damn, I feel a measuring session coming on.

:D cheers :D

one of my main problems too sk lol

yes free trade agreement means duty is dropped from 15% to 10% + 10% GST. IF it is levied.

Everything I have brought in from the US since the FTA was introduced has been duty free, only 10% GST has been added, sometimes.

:D cheers :D

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • I am getting the same issue. Did you resolve it? I just got it after installing my new super coppermix and literally the same issue, new fork, new 18mm carrier, release bearing that came with the kit and replicated the exact same sound. 
    • If you like - I have the STL files so I can email em. There's a couple of gotchas (i.e the holes are not threaded so you might need/will need) to utilize some M3 melt-in threads for some of the points. However if you want to be super accurate, and are willing to remove your calipers and your SHOCKS it's a really good tool. You also might need to scale the part that measures the tyre width a bit wider. It defaults to a 7.5in tyre and I mean who is running that. Luckily with the magic of CAD this is very easy to rescale.
    • jeebus. glad you weren't under it while performing the stunt. Also thanks for the link to the wheel measurer, exactly what I needed
    • In the older stuff there were very significant differences 2wd to 4wd, for example Stagea had strut front end for 2wd and double wishbone for 4wd so it was not minor to swap. From poking around the 2wd v37, it *looks* like it might be more possible; some of the parts specifically have "2wd" stamped on them which suggests the platforms are more similar. You'd still want to start with a 4wd half cut to swap stuff from though. I'd suggest if you don't have a tune on the ECU you don't really need one on the trans either. Throttle mapping is in the ECU side (and you can always use a Roar Pedal if you want the throttle to actually respond to your foot), and really if you are happy with the stock power you probably accept the stock trans behaviour too....its all made to be "sporty" not racey.
    • So, updates. I have not washed the car since it came back from Tassie. I've driven it around a bit but not got around to actually sorting it out. I DID raise it because I cracked the rear bar leaving a hotel which was very distressing. Interestingly, the car drives more compliant now that it's raised a fair bit (5mm front, 15mm rear). Also noticed that my FR height was 10mm lower than FL. So that's now sorted out, too. I also bought this and had it printed: https://www.etsy.com/au/listing/1576422240/wheel-and-tire-fitment-tool-universal?ref=shop_home_feat_1&dd=1&logging_key=08f604d9fa4cc383550ba985e6ac85cd5cac7fbb%3A1576422240 Now, if I was smart I would have taken my brake calipers off to actually use this correctly but it was evident enough to me that in the region where the caliper was... there was nothing to hit suspension/guard/arm wise. So I'm going with "it'll be fine" after using the tool to hopefully very precisely measure the wheel clearance. Also while doing this, I had the very VERY bad idea of jacking one of the wheels/suspension arms up while the rest of the car was on jack stands. I did this to see how the arm would travel. This all was well and good until the car slid off the stands and went through a fence. So don't do that. Incredibly nobody was hurt and there was only minor damage to the rear bumper as the car didn't have far to slide, and had 3-4 wheels on it. The only damage turned out to be the fence itself which was easy to fix, and a little bit of damage to the fibreglass rear bumper trim. I had already planned to try a touch up paint kit to fix the time I drove into my garage door to see if it'd help in the interim before I get it fixed properly. I used the Dr Colorchip kit after looking online and seeing everyone talking about it. Yes it's made for chips and not huge broken missing pieces and I'll be 500% recommending it for stone chips after using it for stupid things like me. This took about ... 10 minutes and looking at the half assed photo the 30 second job I did on the bumper corner was almost perfect just by using the tiny little brush and painting it in. The sealact stuff to remove over-painting is really useful, so if/when I do it again I'll likely slather the touch up paint well over it and then clean it up with the cleaning solution. The wheels should arrive in a couple of weeks. I am still kinda confident after doing a stupid amount of measuring (and borrowing a set of 18x10.5+15) that they will not fit because I overlooked something, somehow and flew too close to the sun. ALSO R34 GTR guard liners do not fit on a GTT. I bought the undertray brake duct guides and had the wonderful problem of them not fitting my intake, my oil cooler and the liners themselves were even worse. Attempting to fit them won't work in general - You would have to cut them up as another poster mentioned as the bodywork is different on the GTT. At least I can try to resell them. So instead of cutting those up, I cut up my old already-cut-up GTT liners and extended them by using some PP plastic and drilling some 8mm holes for some nissan clips for the 'extra' bit. Because I was happy to cut them I was able to mount them pretty damn forward so I now have some semblance of guard liners, and the brake vents seal the bumper from the bottom. It sort-of-looks like this, to give some idea - If you look at the GTR and then the GTT this is when I realised that I needed to seriously measure as the inside of the rim area is entirely, entirely, entirely different and could not take any internet measurements for granted.   
×
×
  • Create New...