Jump to content
SAU Community

Recommended Posts

Took my stagea out to SAUqld club day at Willowbank Dragway yesterday

Last year in October with 30+deg arvo best run was 13.5 at 101mph, until the clutch went which stopped day after 6-7 runs

Yesterday, dry arvo at 22-25deg did 11 runs total with an extra 20hp top end and 45hp thru midrange on new tune at 17psi

348rwhp or 258rwkw. New rear tyres and brand new 4200lb clutch with carbonic centre.

Struggled this time with traction. Spun the rears all the way thru first gear bouncing off the rev limiter @ 7200rpm

Launches were 4500rpm, slipping the clutch to get it off the line without bogging down

First run was 13.8, 2nd 13.4 and then most around 13.1, 13.2 at 105mph

Gave the car a rest for 15 mins to cool out and did 3 more runs.

The best for day was 13.020 @ 106.95mph. Did another 13.039 @ 105.97

60ft 1.98

Overall pretty happy with it. Sooooo close to my target of a mid to high 12 sec family wagon

1st and 2nd gear gearbox noises now thuo :(

Plenty of professional pics of the day on this site

Check out the rear squat on the launches. Photo 327

http://www.dragphotos.com.au/p106689424/h14e15fd6#h14e15fd6

Attached is a bad video my 10y/o son took on DSLR

Annoying thing is a stock 2009 GTR ran consistant 11.6 all arvo!!

Edited by darrinspencer
Link to comment
https://www.sau.com.au/forums/topic/372575-went-to-willow-bank-drags-30-7-2011/
Share on other sites

Thanks for the comments

Main issue was traction off the line

I had new tyres fitted last weekend 245/35/19's

I did not drop tyre pressures, left them how they came from the tyre shop. maybe 38-40psi

They don't have much wall height, so I don't if it make too much different?

Also I have manual rear end, so factory LSD.

Apparently I was getting more left hand rear wheel spin. not both. Not sure?

Maybe a 1.5 lsd would be better?

Thanks for the comments

Main issue was traction off the line

I had new tyres fitted last weekend 245/35/19's

I did not drop tyre pressures, left them how they came from the tyre shop. maybe 38-40psi

They don't have much wall height, so I don't if it make too much different?

Also I have manual rear end, so factory LSD.

Apparently I was getting more left hand rear wheel spin. not both. Not sure?

Maybe a 1.5 lsd would be better?

If you have the viscous lsd any mechanical lsd would ne an improvement.

cheapest trial would be to fit an adustable torque split control unit (gtr tsc http://www.ebay.com.au/itm/GTR-Torque-Split-Controller-TSC-GTS4-GTS-4-RB26-Stagea-/110722890211?pt=AU_Car_Parts_Accessories&hash=item19c79939e3) and put more bias towards the front wheel drive ? might decrease the rear end drive loss you are experiencing?

other tha that, change back to auto :nyaanyaa:

I am

I was

I think

I would be expecting lots more grip if the front end was hooking up. The only time I can get bucket loads of wheelspin is when in 2WD.

If the front end isn't hooking up you have an easy 12 in the car when you sort it out.

I would be expecting lots more grip if the front end was hooking up. The only time I can get bucket loads of wheelspin is when in 2WD.

If the front end isn't hooking up you have an easy 12 in the car when you sort it out.

Well, compared to the others (rwd) cars there and even the R1 bike that ran 10.9, I killed them off the line

I had the bike for approx 1/4 to a 1/3 third of the track and then he would fly past.

It could have been high tyre pressure plus low ride height with too much neg camber causing poor traction.

I will look into it further.

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

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...