13.6@104.5mph, Is there more in it?

XH5LWEPN · 30-12-2007, 11:23 AM

G'day Guys,

Seems to be alot of response here lately to this kind of stuff so i thought i'll throw mine out there to see if i can get any feedback.

Okay so best time to date is 13.682@104.4mph with a 2.294 60ft. Ambient temp was 18.0C, Relative Hum' 69.0%, and track temp of 27.3C.

This was done in full street trim with 235/40/18's at 22psi, Hardtop on tailgate up. Launching was at around 1800rpm to find that meduim between bogging down and just lighting up the rears. Launching like this was giving me best 60ft times with abit of wheelspin off the line.

Ute is running T5 tansmission with Extreme cerami-tallic clutch and std 3.45:1 LSD. Would there be much to be had with a final drive ratio change? Something like 3.73:1 or even 3.91:1?

A set of Hoosier or MT street slicks is definately on the cards in either 15 or 16". How much of a difference do you think a set of these will make as apposed to the 18" street tyres i was running? Only thing that worries me about the slicks is the strain they'll put on the poor ol' T5.

Any feedback/suggestions is greatly appreciated. Any other info you guys want on the vehicle including engine info or suspension etc just fire away and i'll reply as soon as i can.

Cheers Jeff

Walkinshaw · 30-12-2007, 01:01 PM

with semi slicks or MT's should should beable to 60' in the 1.8sec range. IF the T5 holds together a drop from 2.3 to 1.8 should net a high 12.

schnoods · 30-12-2007, 02:34 PM

You'll be able to have a launch, instead of slipping it out and not having the wheel spin probs there.

A high 12 would be great!

XH5LWEPN · 30-12-2007, 07:21 PM

Gee a 1.8 60ft would be unreal. Dont know if it'll be acheivable though, that'd be a real hard launch with a hell of alot of traction. May have to look at suspension changes to acheive that.

I heard that 104mph should "effectively" equal to a high 12sec pass. Really dont think a high 12 would be achievable without an auto with a big stall though, but that is out of the question, It must stay manual, so even a low 13 would see me more than happy.

Quadcams · 30-12-2007, 08:22 PM

Quote:

Originally Posted by xh4ltwepn

G'day Guys,

Seems to be alot of response here lately to this kind of stuff so i thought i'll throw mine out there to see if i can get any feedback.

Okay so best time to date is 13.682@104.4mph with a 2.294 60ft. Ambient temp was 18.0C, Relative Hum' 69.0%, and track temp of 27.3C.

This was done in full street trim with 235/40/18's at 22psi, Hardtop on tailgate up. Launching was at around 1800rpm to find that meduim between bogging down and just lighting up the rears. Launching like this was giving me best 60ft times with abit of wheelspin off the line.

Ute is running T5 tansmission with Extreme cerami-tallic clutch and std 3.45:1 LSD. Would there be much to be had with a final drive ratio change? Something like 3.73:1 or even 3.91:1?

A set of Hoosier or MT street slicks is definately on the cards in either 15 or 16". How much of a difference do you think a set of these will make as apposed to the 18" street tyres i was running? Only thing that worries me about the slicks is the strain they'll put on the poor ol' T5.

Any feedback/suggestions is greatly appreciated. Any other info you guys want on the vehicle including engine info or suspension etc just fire away and i'll reply as soon as i can.

Cheers Jeff

On street tyres you should be able to get down to atleast a 2.0 60' which would ge you around a 13.1 (also myself wouldnt drop your tyre pressures below 30psi as street tyres arnt designed to run that low and traction will suffer) but going to MT streets and 3.9 gears will help alot with improving your 60' and should be able achieve a high 1.8 60' which would proberly get you into the 12's

Falc'man · 31-12-2007, 04:09 AM

Quote:

Originally Posted by Quadcams

On street tyres you should be able to get down to atleast a 2.0 60' which would ge you around a 13.1 (also myself wouldnt drop your tyre pressures below 30psi as street tyres arnt designed to run that low and traction will suffer) but going to MT streets and 3.9 gears will help alot with improving your 60' and should be able achieve a high 1.8 60' which would proberly get you into the 12's

^^^ What he said.

In terms of the T5 holding together, I don't know if this helps but bigAl was launching at 5000rpm with his 175rwkw NA6 BA XLS ute. He also had slicks (15"?) on at the time. He did it many times but had no problems with the box. His best 60' was 1.8 iirc... he also had the 3.73 diff. Since you're running 18's around town, 3.9's would be a nice choice.
I also tend to think - when lower diff ratio is used - you'll have less stress on the components before the diff (ie gearbox, tailshaft etc) but more stress on you axle shafts as they will be baring the brunt of the extra torque.

Congrats on that great time by the way. Cheers.

XH5LWEPN · 31-12-2007, 10:02 PM

Quote:

Originally Posted by Quadcams

On street tyres you should be able to get down to atleast a 2.0 60' which would ge you around a 13.1 (also myself wouldnt drop your tyre pressures below 30psi as street tyres arnt designed to run that low and traction will suffer) but going to MT streets and 3.9 gears will help alot with improving your 60' and should be able achieve a high 1.8 60' which would proberly get you into the 12's

Will hopefully get a re-tune of the ECU in the early new year then head back down there still in full street trim with 30psi in the rear and see how i go with some harder launches.
Then i'll get myself a set of street slicks and head back down to try and better it and see if i can get some harder launches going. Would i be better off running a set on some 16" EL FTR's or goin for some 15"s on a set of steelies?
As far as diff gears go, what do you think would be a better ratio to go for out of 3.7 or 3.9, taking into consideration its a street driven car (not daily) with the occasional drive down the free/highway. Not too concerned with fuel consumption on highway though. Would like something that would give a nice gain down the strip too, and once the T5 goes i'd definately be looking into a TKO, so not sure if there is a different 5th gear ratio(taller) in the TKO's which would probably make the 3.9's a good choice as it'd bring down the revs @ 100km/h for comfy highway driving while still maintaining hard acceleration through the first 3 gears.

Would it be worth running without the hardtop and tailgate on? Or is all that a myth? Was thinking it might actually help with it all on to help the rear hook up better.

Cheers for the replies everyone, greatly appreciated, taking it all on board.

Quadcams · 02-01-2008, 09:40 PM

Quote:

Originally Posted by xh4ltwepn

Will hopefully get a re-tune of the ECU in the early new year then head back down there still in full street trim with 30psi in the rear and see how i go with some harder launches.
Then i'll get myself a set of street slicks and head back down to try and better it and see if i can get some harder launches going. Would i be better off running a set on some 16" EL FTR's or goin for some 15"s on a set of steelies?
As far as diff gears go, what do you think would be a better ratio to go for out of 3.7 or 3.9, taking into consideration its a street driven car (not daily) with the occasional drive down the free/highway. Not too concerned with fuel consumption on highway though. Would like something that would give a nice gain down the strip too, and once the T5 goes i'd definately be looking into a TKO, so not sure if there is a different 5th gear ratio(taller) in the TKO's which would probably make the 3.9's a good choice as it'd bring down the revs @ 100km/h for comfy highway driving while still maintaining hard acceleration through the first 3 gears.

Would it be worth running without the hardtop and tailgate on? Or is all that a myth? Was thinking it might actually help with it all on to help the rear hook up better.

Cheers for the replies everyone, greatly appreciated, taking it all on board.

Definately would go 3.9's, shouldnt suffer much on the hwy.
Mate the end of the day its all about power/weight ratio so taking the hard top and tailgate off which guessing would be close to about 40odd kg's and be worth about a tenth or so.

XH5LWEPN · 02-01-2008, 11:58 PM

Quote:

Originally Posted by Quadcams

Definately would go 3.9's, shouldnt suffer much on the hwy.
Mate the end of the day its all about power/weight ratio so taking the hard top and tailgate off which guessing would be close to about 40odd kg's and be worth about a tenth or so.

No worries mate, will definately look at 3.9's in the near future. Diff needs a recon anyway, she aint very tight anymore. Is there anyway to go to a better LSD than the std set-up? I dont want to go to a spool either, being a street driven car.

What i'll do is get myself a set of street slicks, drop the hard-top and tailgate and head back down there and see what i can manage.

Cheers for the advise, much appreciated ;)

Quadcams · 03-01-2008, 07:02 PM

Quote:

Originally Posted by xh4ltwepn

No worries mate, will definately look at 3.9's in the near future. Diff needs a recon anyway, she aint very tight anymore. Is there anyway to go to a better LSD than the std set-up? I dont want to go to a spool either, being a street driven car.

Mate just find yourself a good diff specialists to rebild it, I know Kazz do a centre that is very strong but not sure if it will fit your but they do fit the Ba diffs with a little bit of machining, but with the power you have proberly would get away with just a good rebuild and you will be sweet.
just remeber sticky tyres (ie: MT streets or slicks ) the wear and tear increases substancially on you driveline, especially in a manual.

Tiapan · 02-01-2008, 10:35 PM

Quote:

Originally Posted by xh4ltwepn

Will hopefully get a re-tune of the ECU in the early new year then head back down there still in full street trim with 30psi in the rear and see how i go with some harder launches.
Then i'll get myself a set of street slicks and head back down to try and better it and see if i can get some harder launches going. Would i be better off running a set on some 16" EL FTR's or goin for some 15"s on a set of steelies?
As far as diff gears go, what do you think would be a better ratio to go for out of 3.7 or 3.9, taking into consideration its a street driven car (not daily) with the occasional drive down the free/highway. Not too concerned with fuel consumption on highway though. Would like something that would give a nice gain down the strip too, and once the T5 goes i'd definately be looking into a TKO, so not sure if there is a different 5th gear ratio(taller) in the TKO's which would probably make the 3.9's a good choice as it'd bring down the revs @ 100km/h for comfy highway driving while still maintaining hard acceleration through the first 3 gears.

Would it be worth running without the hardtop and tailgate on? Or is all that a myth? Was thinking it might actually help with it all on to help the rear hook up better.

Cheers for the replies everyone, greatly appreciated, taking it all on board.

hey mate, what rim size/hp are you running now? use a 15 if you can, more sidewall flex the better, thats where the traction is, you can get ET street radials is 18inch but if you have more then 320rwhp i wouldnt bother trying to get em to hook up,

come to think of it, i need full slicks and have a set of four 15inch cragar street pros and micky thompson street radials, might let em go for the right price ;)

XH5LWEPN · 03-01-2008, 12:09 AM

Quote:

Originally Posted by Tiapan

hey mate, what rim size/hp are you running now? use a 15 if you can, more sidewall flex the better, thats where the traction is, you can get ET street radials is 18inch but if you have more then 320rwhp i wouldnt bother trying to get em to hook up,

come to think of it, i need full slicks and have a set of four 15inch cragar street pros and micky thompson street radials, might let em go for the right price ;)

Hey Bud,

Currently running 235/40 street tyres on a set of 18's. As far as power goes, she should be up around 300rwhp quite comfortably.

Cheers for the offer mate, but i've got buckley's chance of being able to afford to go to that length atm lol, especially after christmas :evil3: . I'll just settle for a pair street slicks to go on my FTR's or 15" steelies, could have a pair lined up just need to get some cash organised.
They're Hoosier 225/50/16" D.O.T Drag Radials with an approximate diameter of 24.9", so should do the trick quite well, fingers crossed i can get them and head back down.

naughts · 30-12-2007, 08:58 PM

To give you an idea I run 12.9@106 with an Auto, 2700 stall , 3.9 gears and M/T street e/t's. ( No wheel spin) 1.9 60 ft.

greenfoam · 31-12-2007, 01:49 PM

You should be able to make much better 60 foot times than 2.3 you can make 2.3s in some very slow cars. Maybe 4000 rpm launches and more clutch would help. I make 2.06 60 foots in a Auto 5 litre VP Commodore with a stock engine and almost stock exhaust, I do have 3.45 gears though but I was making 2.1's on the stock gears with a single spinner diff. I've only got 150rwkw max.

It took me along time to find some street tyres that would stick but once I got the right rubber there was no wheelspin whatever no matter how hard I got on the brake with the stock converter. If you can knock your 60 foot down to 1.8 ro 1.9 you will make your high 12 even with your 3.45 gears, you should be able to do that with that much power on good street tyres. It's 100% possible, just have to get all the power onto the ground. But don't forget to pray to the T5 gods every night

. Also 3.7s should be you ideal ratio but wont really be any faster than 3.45s in a manual

p.s I run 38 psi in the rear tyres

**ebxr8240** · 31-12-2007, 11:58 PM

Just don't power shift too hard..Especially 2nd to 3rd....

Tiapan · 03-01-2008, 11:17 AM

give me a call at stone racing 94371526, i'll do you a good deal ;)

atec77 · 03-01-2008, 08:24 PM

Quote:

Originally Posted by xh4ltwepn

G'day Guys,

Seems to be alot of response here lately to this kind of stuff so i thought i'll throw mine out there to see if i can get any feedback.

Okay so best time to date is 13.682@104.4mph with a 2.294 60ft. Ambient temp was 18.0C, Relative Hum' 69.0%, and track temp of 27.3C.

This was done in full street trim with 235/40/18's at 22psi, Hardtop on tailgate up. Launching was at around 1800rpm to find that meduim between bogging down and just lighting up the rears. Launching like this was giving me best 60ft times with abit of wheelspin off the line.

Ute is running T5 tansmission with Extreme cerami-tallic clutch and std 3.45:1 LSD. Would there be much to be had with a final drive ratio change? Something like 3.73:1 or even 3.91:1?

A set of Hoosier or MT street slicks is definately on the cards in either 15 or 16". How much of a difference do you think a set of these will make as apposed to the 18" street tyres i was running? Only thing that worries me about the slicks is the strain they'll put on the poor ol' T5.

Any feedback/suggestions is greatly appreciated. Any other info you guys want on the vehicle including engine info or suspension etc just fire away and i'll reply as soon as i can.

Cheers Jeff

http://www.tunercalcs.com/hp-from-quarter-mile-et.html
traction and driving maketh the time .I would remind you smaller dia wheels make a taller diff and a shorter time .

BENXR6T · 03-01-2008, 10:21 PM

anyone wanna give me some advice then

my 60 ft is about 2.3 - XR6T - auto. i stall it to just under 200rpm

Quadcams · 04-01-2008, 05:30 PM

Quote:

Originally Posted by BENXR6T

anyone wanna give me some advice then

my 60 ft is about 2.3 - XR6T - auto. i stall it to just under 200rpm

Ben with the auto you should be down around the 2.0 60ft mark on street tyres no worries, and that will get you about a .4 to .6 improvement in your times, driver is a big factor at the strip and practice is important to get consistancy and good times.
Not a auto driver but there seems to be a technique in the way they do it, not just stall and plant it as some of my mate in there BA's have had some big variances in they way they stall and the way they use the throttle as well. One mate I know is very good with the auto (6sp and 4sp) is Hot460 consistant as use to do consistant 2.0 60's with his 4sp auto BA Xr8 (no high stall) and 1.9 60's in his 6sp auto BF, also just won the Nostalgia meet at WSID in his XA coupe first time out, proberly one to speak to about the auto's.

BENXR6T · 04-01-2008, 10:55 PM

i know how to race, iv'e been down the strip probably 200+ times, i have 66slips in my glovebox alone lol

i'l try again. lol

Quadcams · 05-01-2008, 07:07 PM

Quote:

Originally Posted by BENXR6T

i know how to race, iv'e been down the strip probably 200+ times, i have 66slips in my glovebox alone lol

i'l try again. lol

Mate you ask for advice and with a 2.3 60' sounds like you needed it lol.

:
Maybe 400 passes, practice makes well supose to be perfect.

BENXR6T · 06-01-2008, 03:22 PM

i think a custom tune might help too

KW XRT · 30-01-2008, 07:54 PM

Quote:

Originally Posted by BENXR6T

i think a custom tune might help too

Ben you have same 60footer as I did what 1/4 did you do.Mine was best of 14.5 @ 96 mph.waether was very hot in CQ though 37 degree hotter on the track.

Car was stilltgetting faster when I nran out of racers.

cheers kyren

KW XRT · 30-01-2008, 09:23 PM

btw XH nice times got to be happy with that.Lower gears will help

cheeers kyren

XH5LWEPN · 30-01-2008, 09:29 PM

Quote:

Originally Posted by KW XRT

btw XH nice times got to be happy with that.Lower gears will help

cheeers kyren

Cheers Kyren, was wondering when someone was going to bring it back on topic lol.

Definately considering some 3.9 gears for the rear end, then a 2 piece talishaft conversion and a TKO-600.

KW XRT · 01-02-2008, 11:44 PM

Quote:

Originally Posted by XH5LWEPN

Cheers Kyren, was wondering when someone was going to bring it back on topic lol.

Definately considering some 3.9 gears for the rear end, then a 2 piece talishaft conversion and a TKO-600.

Sorry to crowd your post but you probly notice no one has posted my thread.Like some 3.9's myself.Thinking of a high stall to get some of that robbed HP back.Anyway if my car was as fast as your's I wouldn't be here annoying you.

Might give her a run at the night meet and see how she goes as I feel a fair bit of HP was lost due to the heat.

cheers kyren