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Ok Im Officially Addicted....

shonen

By shonen,
in New South Wales

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shonen Grand Master

shonen

Posted
Posted (edited)

Being a hardcore circuit fan.....I never thought id say this....but im addicted to drag racing now.

WSID only being 10min from my house it was bound to happen....

Anyways I have a question for the hardcore drag racers out there.......got a few issues with traction...whats happening ? any solution besides changing rubber ?

Ill start from the top...

Was there are few weeks before for the first time ever (yes popped my drag racing cherry...) and managed a 13.9 running stock boost. Misfiring issues stopped me from running higher boost levels.

Even though I was able to run high boost (still only 0.9bar running stock turbo).. best I got was a 14.4. I have a feeling my rims may be a factor in this.

Last time I had the impuls which were 9.5 inch wide and now I have the Works which are 9inch wide. But still using the same 275 rubber....maybe sidewalls are flexing too much ??? dont know. but thats the only change to the car that I can think of thats causing traction issues. No traction what so ever no matter how much I ride the clutch.

Any ideas on how I can fix this without having to change to 265 or smaller tyres ?

As for mods...just the basic mods for now.

fmic

Power fc

Blitz ID3

turbo back exhaust

stock suspension.

Heaps more done to the car...but these are the only "power" making mods.

Managed to get 220rwkw during the last tune...admittedly this is a bit of a happy dyno. But still should be running over 200rwkw....so mid 13s should be doable right ? yes ? no ?

PS

Still gonna build my car for circuit when I change the suspension and turbo etc :lol:

Edited by shonen
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scathing Grand Master

scathing

Posted
Posted

Dude, you want sidewall flex for drag. It increases your effective contact patch. Check out the serious drag cars next time you're out - the rear tyres always look like they're about to fall off because they run so little pressure.

On corollary, run your front tyres with as much pressure as you can. It'll decrease the contact patch which will reduce your rolling resistance. It will also reduce flex so your weight doesn't shift off the rear tyres as much when you change gear.

Are you dropping a big burnout to warm your tyres up before the launch? That can help a lot. I've also seen some people drive around the watered patch in the staging area too.

shonen Grand Master

shonen

Posted
  • Author
Posted (edited)

hahah dude im a beginner at drags.....but I thought sidewall flex was only good or deemd necessary from full drag slicks ?

like the Micky Ts etc.....

Anyways for one reason or another I have a feeling that the narrower rims I got at the back now is contributing to the traction issues and hence bad times....not using it as an excuse, but the car really does feel "different" out on the strip. In regards to the burnout, I do small ones but dont sit on the spot lighting them up.....275 in 18s can get quite expensive...so dont want to wear them out TOO fast.

Edited by shonen
satanic Grand Master

satanic

Posted
Posted

Tom are you sure they're the only mods you have :) Your car looks to have a lot more goodies than that ~ Also, stock suspension? Do you have different springs because your car is definitely not at the stock ride height...

220rwkw + using those modifications only seems a little unrealistic (0.9bar being 13.23psi) but you've already mentioned a happy dyno.

Maybe look at SydneyKid's R34GTT suspension package, I read the thread and with that setup you can shave your times down :) He proves how vital suspension really is.

Good luck mate!

S

SECURITY Grand Master

SECURITY

Posted
Posted

i ran a 14.0 without using the gears on my auto on 205 rubber on 10-12psi.

its more than likley your start offs that will get you. my first run EVER i ran 2secs slower than i am now. i ran a 16.4, my second run i ran a 15.6 and the last time i went i ran a 14.0.

its always how it is when starting out, just keep going a few times and get opinions from people that have seen you run. its usually the starts that cause slow times.

shonen Grand Master

shonen

Posted
  • Author
Posted
Tom are you sure they're the only mods you have :) Your car looks to have a lot more goodies than that ~ Also, stock suspension? Do you have different springs because your car is definitely not at the stock ride height...

220rwkw + using those modifications only seems a little unrealistic (0.9bar being 13.23psi) but you've already mentioned a happy dyno.

Maybe look at SydneyKid's R34GTT suspension package, I read the thread and with that setup you can shave your times down :D He proves how vital suspension really is.

Good luck mate!

S

hahaha stan...as mentioned before they are the only POWER making mods....

and yeah the springs are factory option "nissan sport" springs......

yes happy dyno...but still should be over 200rwkw.....its a manual afterall :D hahahha jk

satanic Grand Master

satanic

Posted
Posted

Meh, manual-spaniel..... only a few more hours till I see the effects of my new setup :D I'll cap it at 240rwkw for now... don't want to fry my gearbox :D

Hope to hell it ain't a happy dyno too... otherwise I'll look like a fool when I put it on the dyno at UAS on the 11th :)

shonen Grand Master

shonen

Posted
  • Author
Posted
What are your 60ft times?

What pressure do you have in the rear tyres?

What RPM are you launching at?

Are you slipping or side-stepping the clutch?

tyre pressure is around 22psi on the rears and launching around 3krpm and slipping the clutch to ease it off the line and 60ft is a shit 2.1 sec

TTT Grand Master

TTT

Posted
Posted (edited)

get a set of stock rims.

or even R33 rims with 225's.

I'd say this would get you a better overall time than the 18's.

try different launch styles.

try 500rpm higher or lower each time to find perfect spot for you.

try slipping the clutch a little till it gets moving then jumping off it.

try jumping straight off the clutch.

it's just practice.

on my s14 with 175rwkw and heavy 17x9's with 255's at 22psi air in them, best I managed was a 13.8 with 1.9 60"

stock clutch and stock turbo.

I was due to go back with 300zx wheels with 225's on them but never got that far.

I hope that helps some

Edited by GTST
NickR33 Grand Master

NickR33

Posted
Posted

I don't think you have 200rwkw if your getting 2.1sec 60ft times and only running 13.9 ET...

as an example I ran 13.7 ET with a 60ft of 2.4 and I have about 200rwkw with similar mods to yours...

leads me to my next question what was your MPH?... as I reckon 2.1 ain't that bad with street tyres and should be good for low 13s ET

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