Disappointed 14.100 Quarter BA XR8

[kypez]

Hi Guys,

Very disappointed last night to run only a 14.100 at best last night. I just could not get traction off the line. I guess running 20's werent the best idea! Anyway, what do you guys think of the following modifications to allow for a better time? (I want to try again next Wednesday and dont think I can put in more in a week).

SS Induction Kit (currently have a pod, nothing else)
3.7 diff
16" wheels

Would these 3 simple mods help? I'm not gonna hunt for more HP till I figure out how to launch what I have. I have a 250hp NOS kit, but its all useless till I get off the line better. 2.4 60' is hopeless.

This was the first time with the car. I've always run the bike, which is good for a 10.8, but I want to get this car up and going.

Also, launching it at 3400 rpm. Do you think it too high? (I'm a little clueless here, so please be gentle. I've only circuit raced before)

Any suggestions? Or should I just bite the bullet and strap on a Kenne Bell?

Thanks guys.

kypez.

[Grippy]

Those 20's are definitely killing your 60' foot time, 3,400rpm might be a little too much off the line for a manual, was it wheelspinning much? If you get your 60' time down there is a better ET there for sure!

[RG]

Don't get an SS intake, go straight for a BPR airbox.

[Grippy]

Originally Posted by RG

Don't get an SS intake, go straight for a BPR airbox.

Agreed, proven performance on Boss engined cars and much better quality over SS

[SpoolMan]

For the mods you have and being a manual 2003 Boss 260 your time isn't to bad, at our last meet I seen FG XR8 and a FG GS both running 14.2's and they were auto's..
Best time I had with all bolt-ons 2003 xr8 ute with unichip was 13.5.

[tweeked]

3500 is fine, but dont dump the clutch.

I rev to 4500 on street tyres, 5500 on MT's and release half clutch, then as revs and speed equalise let the rest out. 1.7 60ft on streets and 1.6 on Mickey Thompsons.

If you are after a quicker strip time - 275 17 inch MT streets are the best bang for buck.

I am with the others on the cold air, go with BPR, a bigger air cleaner and great flow.

[swanee]

I did a 13.51 in my ute.

4.11 diff gears
tune
18" race slicks [265/35] (not drag slicks)
and a standard are box.

I launched at 3500rpm and slipped the clutch away from the line. I was doing 2.0 60' times, but crossed the line at 106mph. Trying to get a 2 tonne ute off the line is hard for me.

I did a 13.863 on 19" 275/30 street tyres at 99mph with a 2.2 60' and then another 13.863 @102mph with a 60' of 1.9 with 18" 245/40 streets.

One thing i am good at is being consistantly inconsistant.

[kypez]

Originally Posted by Grippy

Those 20's are definitely killing your 60' foot time, 3,400rpm might be a little too much off the line for a manual, was it wheelspinning much? If you get your 60' time down there is a better ET there for sure!

I really tried to slip the clutch and baby it, but all I got was spin spin spin!! It was stupid, I wasnt going forward, more sideways.

I'll check out this BPR box. I've redone my front end so if I can get a box at the right angle, there is plenty of Air coming in.

I have 275 20's, maybe a smaller Rim will help. Thanks guys. I'm going to see what MT's I can get, though I'll have to fit a tail shaft loop to run slicks.

Tweeked, thats massive 5500 for the launch. Those MT's must be really sticky!!

[swanee]

to run full slicks you'll need front runners too. which you wont fit over the brembos.

just try some ET street radials and make sure you get some heat into them. otherwise they'll just spin off the line.

[kypez]

Originally Posted by swanee

to run full slicks you'll need front runners too. which you wont fit over the brembos.

just try some ET street radials and make sure you get some heat into them. otherwise they'll just spin off the line.

I think its the wheels. Have you done anything more to your car mate? I see you have it tuned by intune. They did my XR8 as well, (ie, exhaust and clutch and tune). But you're a good .6 of a second quicker.

[bonspeed]

Originally Posted by kypez

Hi Guys,

Very disappointed last night to run only a 14.100 at best last night. I just could not get traction off the line. I guess running 20's werent the best idea! Anyway, what do you guys think of the following modifications to allow for a better time? (I want to try again next Wednesday and dont think I can put in more in a week).

SS Induction Kit (currently have a pod, nothing else)
3.7 diff
16" wheels

Would these 3 simple mods help? I'm not gonna hunt for more HP till I figure out how to launch what I have. I have a 250hp NOS kit, but its all useless till I get off the line better. 2.4 60' is hopeless.

This was the first time with the car. I've always run the bike, which is good for a 10.8, but I want to get this car up and going.

Also, launching it at 3400 rpm. Do you think it too high? (I'm a little clueless here, so please be gentle. I've only circuit raced before)

Any suggestions? Or should I just bite the bullet and strap on a Kenne Bell?

Thanks guys.

kypez.

What was your trap speed?

[kypez]

Originally Posted by bonspeed

What was your trap speed?

102.38mph
164.77kms/hr

[swanee]

Originally Posted by kypez

I think its the wheels. Have you done anything more to your car mate? I see you have it tuned by intune. They did my XR8 as well, (ie, exhaust and clutch and tune). But you're a good .6 of a second quicker.

Tune
Underdriven 25%
4.11
Mal Wood Clutch
2.5" exhaust with cats and headers
BMC air filter with standard induction set up

Runs approx. 240-245rwkw

Lightened (removed hardlid and spare wheel) it a bit to get the time down but am still pushing the scales at around 1900kg.

[tweeked]

Mickey Thompson streets with a good burnout can hold most launches at 250rwkw, as long as you dont dump the clutch.


http://www.youtube.com/watch?v=A3nYAmrmIF0

[JAYBA]

not too bad a time

but i would expect mid thirteens from a manual with your mods and a good launch..

my ba xr8 with

cai
4.10 gears
headers only & tune (245rwkw)
went 13.006 and consistent 13 flats on street tyres with a 2.1-2.2 60'

4sp autos are much easier though

your mph is a little low also those 20' wheels dont help even the weight of them slows you down a heap let alone getting the power to the ground

[gtfpv]

Originally Posted by kypez

Hi Guys,

Very disappointed last night to run only a 14.100 at best last night. I just could not get traction off the line. I guess running 20's werent the best idea! Anyway, what do you guys think of the following modifications to allow for a better time? (I want to try again next Wednesday and dont think I can put in more in a week).

SS Induction Kit (currently have a pod, nothing else)
3.7 diff
16" wheels

Would these 3 simple mods help? I'm not gonna hunt for more HP till I figure out how to launch what I have. I have a 250hp NOS kit, but its all useless till I get off the line better. 2.4 60' is hopeless.

This was the first time with the car. I've always run the bike, which is good for a 10.8, but I want to get this car up and going.

Also, launching it at 3400 rpm. Do you think it too high? (I'm a little clueless here, so please be gentle. I've only circuit raced before)

Any suggestions? Or should I just bite the bullet and strap on a Kenne Bell?

Thanks guys.

kypez.

to put this in perspective . 14.1 sec over 400m is faster than A GTHO PH3 @14.4 . THE AU 220 MKIII MATCHED IT AT 14.4 . SO THE BA BEING THE NEXT MODEL DOING 14.1 . IS PRETTY GOOD CONSIDERING YOU" HAD TRACTION PROBLEMS .

[HEMI POWER]

Originally Posted by RG

Don't get an SS intake, go straight for a BPR airbox.

Nothing wrong with the ss induction.I ran my best time with it on,and i have the good one now.

[Sorted]

Yes you have 20"s but what type of tyre, is it a cheapy or a name brand?

Did you drop the tyre pressure?

Did you smoke them up big time for the burn out? The hotter the tyre, the stickier it is

Your 60 foot is really really bad, my lowest is 2.23 and that's still bad.

I would only be looking at tyres as your car is obviously good for 13's - you just got to get some grip

[naughts]

Time sounds about right. Seen plenty of XR8's and GT's run 14.00's
These sort of cars are quick on the street, but on the track, 14.00 is about normal. Plenty of HSV's running 14.00 as well. Dont be to stressed about it.
Smaller diam tyres will help in acceleration, but without the right tyres, it will all go up in wheel spin.

[Grechie]

14.1 thats a pretty good time with traction loss!

I've seen B Series GTs run same time, but just with a improved 60 foot alone your looking at least a 13.9 which is fantastic for one of those chunky suckers.

B Series Bosses, will be looking at owning one in the near future, i reckon theyre great!

[GTP owner]

As with above - don't be upset with a 14.1 I usually run 14.0 flat in my standard BA GTP manual. You need a lot less revs on launch. Start with 2,000rpm then work your way up in 100rpm increments. I can usually only go 1,800 before wheelspin takes over with stocky tyres.

[nstg8a]

Originally Posted by Sorted

Did you smoke them up big time for the burn out? The hotter the tyre, the stickier it is

most street tyres should only have a light burnout, go to hard and your tyre overheats and wont generate anywhere near as much traction.

[JAYBA]

Originally Posted by nstg8a

most street tyres should only have a light burnout, go to hard and your tyre overheats and wont generate anywhere near as much traction.

what he said...

[SNB05T]

the best i've done is a 13.710 @106.5mph on 17inch stockys with street tyres.

i also have the same problem with traction but i am working on a few things to fix that ( i:e launches etc) to get my 60' times better (my best is 2.12 60').

i'm also trying better shifting techniques to improve my trap speed more (so far it's working)

i recently got the 3:73's put in the diff and a re tune so i'm keen as to run next weekend.

if you're in Sydney come out to the bracket meet next weekend if you're free.
(shameless free plug )

[FPV8U]

My XR8 with CAI & Exhaust went 14.0 on 18's i wouldn't stress too much it's always going to be a struggle with street tyres.

[kypez]

Thanks for the replies guys. I'm running pretty crappy Nitto's on the rear. I was running 30.5 psi when I did the time. Its just annoying as I know if I can get it off the line right, it really opens up. I think I almost run out of third at 165 ish, maybe a shift to 4th might have pushed it back to the power band (another thought).

I did do a good burnout but as mentioned, I knew with street tyres, too much will increase the pressure too much and be a waste. Streety's are designed to heat quickly.

dan b, I am in Sydney. I was going to come down next wednesday night and try again, with different tyres/wheels. 17's with some decent compound would do the trick I think. I have some old 16's around here, but I think that might end in wheel spin.

I have a short throw shifter that worked a treat too.

I might add that I didnt use the NOS kit in any of these runs. I was thinking of hooking it up, but I think I'm going to try tyres first!

[swanee]

Save the giggle gas... go out and achieve a good time without it. But most of all have fun.

Practice makes perfect... the only person you should set out to beat is yourself. No one else.

Everytime i go out, it is to beat my previous PB if I can. And have some fun battles during the process.

[kypez]

Originally Posted by swanee

Save the giggle gas... go out and achieve a good time without it. But most of all have fun.

Practice makes perfect... the only person you should set out to beat is yourself. No one else.

Everytime i go out, it is to beat my previous PB if I can. And have some fun battles during the process.

too right mate. I'm going up against myself here. I just want to make sure I get the best out of my car and I. Hence the reluctance to do any serious mods till I get this setup right.

The NOS was a kit from my old car that I kept. I havent used it for the simple reason I want to get the most out of the car first. I just want to figure what to do to get it moving or to "make up" for the loss in first (ie, diff ratio)

[Falc'man]

I personally wouldn't add more power until I figured out the best launch technique (if the aim of it all was to get a better time over the 1/4).

kypez, get a proper 60' time and a low 13 is yours. When I say proper I mean what the car is actually capable of, like 2.0, or 1.9. No more power required.

[CRAIGAU3220]

A mate of mine has a GTP with same RWKW as you, running on stock 19s with 2000rpm launch has done best of 13.3

If running street tyres, the newer the better, don't bother if your tyres are more than two years old.

Cheers, Craig.