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Lighter Pulley Kit + Tailshaft

justinfox
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djr81 Grand Master

djr81

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Maybe it would be good to throw your car on the new UAS dyno very soon, then have this installed and get it dyno'd again on the SAU Dyno day coming up soon?

I hope everyone realises that some dynos see a lower rotating inertia for the drivetrain & erroneously accredit the quicker ramp up of the system to there being more horsepower. ie put in your tailshaft & the dyno will show a gain in horsepower that is not really there.

Which is not to say that lower weight/inertia is not a very good thing in itself. :huh:

Edited by djr81
djr81 Grand Master

djr81

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Posted
Would it not show that it revs quicker?

Well out in the world, yes. But on the dyno it is different. As I understand it (Read, probably don't) the inertia of the dyno mechanism needs to be taken into account when the power figures are worked out. Now the dyno somehow needs to differentiate this inertia from the cars drivetrain inertia. So what I am trying to say is that if you lessen the cars drivetrain inertia it will accelerate faster (Without any extra horsepower) but if the inertia figure in the dyno for the car doesn't get changed it "sees" it as more horsepower.

Now my head hurts. :huh:

justinfox Mentor

justinfox

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Too technical for your own good. A dyno is going to be more accurate than my butt dyno but I am not one for figures and dynos in general so may not bother at all with the dyno. No point at all to me... more keen to see what the car feels like now on Eastern Creek.

R32 TT Mentor

R32 TT

Posted
Posted

Ok well this is killing me.. I've been sitting back watching this thread - keen to see an outcome.. Now I'm all teased and tetchy..

Justin? How the hell is it going?? Is it in yet??? :)

....I really want to see if one of these is worth it.

GTR32GUS Mentor

GTR32GUS

Posted
Posted
Ok well this is killing me.. I've been sitting back watching this thread - keen to see an outcome.. Now I'm all teased and tetchy..

Justin? How the hell is it going?? Is it in yet??? :thumbsup:

....I really want to see if one of these is worth it.

I think the owner would be hanging out more

But yeah i would like to hear a report when she is painted

Eug Grand Master

Eug

Posted
Posted

justinfox: did you end up getting the pulley kit? with these types of mods wouldn't you be looking at 1/10ths of a second improvements? or am i way off the mark and it basically all comes down to improving the driveability?

justinfox Mentor

justinfox

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Yes I have the pulley kit.

I'm on a mission to save weight. Car is super responsive already, even better response from the pulley kit + shaft will be a bonus but weight savings are my main focus. The shaft + pulleys are half the weight of the original items.

Eug Grand Master

Eug

Posted
Posted

few quick questions RE: pulley kit.

i would say your car is an exception to most other regular street cars.

first of all, would you recommend it for the average skyline daily driver/street car?

second of all, what were the gains like? any negatives?

lastly, cost? (UAS $430 for R32GTST... no R33)

justinfox Mentor

justinfox

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Car is in the paint shop and I've not yet tracked it since the pulley kit so bare with me! I'll be sure to report back.

PS: My car really isn't a street car. It's much more of a circuit car. It is street registered and fully engineered but it's damn hard to drive on the street. UAS prices are about right but I get all my gear through www.jdmyard.com prices I can't mention as I work for them and get special rates. Hope that helps!

dontfeelcold Experienced

dontfeelcold

Posted
Posted

Were you advised to protect the driveshaft (when it is in the car) in anyway or does the driveshaft already have some sort of protection over the CF section?

I have been told that CF tailshaft don't like scratches and dings.

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