Help with suspension setup, for a Drag day - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Master Chief · 02-20-2009, 01:20 PM

Hi guys.

I am not too much into Drag racing, and my car is mainly built for Dirft/Road racing, but there is an upcoming event, and i wanted to try my luck.

Its a S14, SR20DET, 2L, with 457hp and 380lb/ft at the hubs.
Its has Tein Flex suspension and all Kazzama rods etc, Mazworks Z32 box and CF one piece shaft.
Enkei RPF1 17x9.5 front and 17x10 rear, with Dunlop Dirreza Z1 Star spec, 235/40 front and 255/40 rear.

I was thinking of changing to the rear OEM suspension, to have the car softer, and set it to the stiffest at the front.

What else can i do ?
I heared that disconnecting the REAR stabilizer links, would greatly help.
I allso heard something like that about the fronts as well, but i cant see the logic in that.

Can anyone explain, how would dissconecting the Links (Front or Rear) help ?

Another thing i was wondering about, is the pressure i should be running on the rear and front.... As these are basicly street Gtip tires, and not DRAG - i guess the stiff side wall would not be ideal, but still - thats what i have now.

I would allso try to set up my Haltech's launch controll - but not sure to what launcj RPM i should aim for.
Any ideas ???

Any estimation to what times i should be looking for with the above setup ?

Thanks.

EDacIouSX · 02-20-2009, 01:28 PM

i have no idea how to answer your question but one thing i do know is no one can answer how much RPM unless you tell us what engine you are running, and maybe where the red line sits at (not sure if redlines important). or well, yea i have no clue heh.

Master Chief · 02-20-2009, 01:34 PM

Yep, sorry about that - its an SR20DET - 2L engine, i'll update the original post.

Sleepiedaze · 02-20-2009, 03:56 PM

remove rear sway bar.
lower rear tire pressure as you go. ex... start at 35 psi and go lower till you find a good pressure where the tires hook up nicely.

if your running street tires there is no need for a long smokey burn out. spin the tires just to remove the dirt and anything else that was picked up.

as far as RPM launch its all up to the driver. some like to launch off the limiter some like to feather the clutch just depends on you and your tire/HP. for street tires just rev it to about 2500 to 3000 and see how it responds.

Master Chief · 02-20-2009, 04:33 PM

Do i need to remove the Rear Sway Bar completley, or is it enough just to disconnect the links ?
How about the front Sway bar ? any benefit in removing the links in the front ?

Any idea what kind of 1/4mile ET should expect ?

Otto347 · 02-20-2009, 04:39 PM

Quote:

Originally Posted by Sleepiedaze

remove rear sway bar.
lower rear tire pressure as you go. ex... start at 35 psi and go lower till you find a good pressure where the tires hook up nicely.

if your running street tires there is no need for a long smokey burn out. spin the tires just to remove the dirt and anything else that was picked up.

as far as RPM launch its all up to the driver. some like to launch off the limiter some like to feather the clutch just depends on you and your tire/HP. for street tires just rev it to about 2500 to 3000 and see how it responds.

Why are you suggesting removing the rear sway bar? When the car comes out of the hole it will be all over the place with no rear sway bar.

Sleepiedaze · 02-20-2009, 05:12 PM

Quote:

Originally Posted by Otto347

Why are you suggesting removing the rear sway bar? When the car comes out of the hole it will be all over the place with no rear sway bar.

from personal experience i removed the rear sway bar and my 60 ft increased up slightly. then again im running a completly different set up then him so just a suggestion.

Sleepiedaze · 02-20-2009, 05:13 PM

Quote:

Originally Posted by Master Chief

Do i need to remove the Rear Sway Bar completley, or is it enough just to disconnect the links ?
How about the front Sway bar ? any benefit in removing the links in the front ?

Any idea what kind of 1/4mile ET should expect ?

most muscle guys remove the front sway bar when drag racing. some remove the rear and some remove them all. you dont need to remove it completly just disconnect it. try it both ways and find what works for you.

Otto347 · 02-20-2009, 05:37 PM

Quote:

Originally Posted by Sleepiedaze

some remove the rear and some remove them all.

Sorry but removing the rear swaybar on a drag car is a no no. I work for a suspension company that specializes in stock suspension drag racing and we have extra large/overkill sway bars for the rear of drag cars. You want the body of the car to stay level coming out of the hole so there is no seperation/compression of the body causing the axle to rear steer the car into the other lane or into the wall.

To the OP just leave the swaybar on in the rear.

Master Chief · 02-21-2009, 09:00 AM

Thanks guys, though i kinda of managed to remain confused as before...:-)

How about the ET i might expect with my above setup ???

***S14DB*** · 02-21-2009, 09:50 AM

Have you weighed your setup?

Master Chief · 02-21-2009, 01:11 PM

No - but the car is in standard trim, wich means standard S14 weight, whetever it is - about 1250kg, i think.

02-20-2009, 01:20 PM	#1
Master Chief Zilvia Junkie Join Date: Feb 2006 Location: Israel Posts: 332 Trader Rating: (3) Feedback Score: 3 reviews	Help with suspension setup, for a Drag day Hi guys. I am not too much into Drag racing, and my car is mainly built for Dirft/Road racing, but there is an upcoming event, and i wanted to try my luck. Its a S14, SR20DET, 2L, with 457hp and 380lb/ft at the hubs. Its has Tein Flex suspension and all Kazzama rods etc, Mazworks Z32 box and CF one piece shaft. Enkei RPF1 17x9.5 front and 17x10 rear, with Dunlop Dirreza Z1 Star spec, 235/40 front and 255/40 rear. I was thinking of changing to the rear OEM suspension, to have the car softer, and set it to the stiffest at the front. What else can i do ? I heared that disconnecting the REAR stabilizer links, would greatly help. I allso heard something like that about the fronts as well, but i cant see the logic in that. Can anyone explain, how would dissconecting the Links (Front or Rear) help ? Another thing i was wondering about, is the pressure i should be running on the rear and front.... As these are basicly street Gtip tires, and not DRAG - i guess the stiff side wall would not be ideal, but still - thats what i have now. I would allso try to set up my Haltech's launch controll - but not sure to what launcj RPM i should aim for. Any ideas ??? Any estimation to what times i should be looking for with the above setup ? Thanks.

02-21-2009, 09:50 AM	#11
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	Have you weighed your setup? __________________ Comments should be taken as Opinions not as Statements of Fact

02-20-2009, 01:28 PM	#2
EDacIouSX Post Whore! Join Date: Nov 2004 Location: Los Angeles Age: 39 Posts: 4,566 Trader Rating: (53) Rides Gallery: EDacIouSX Feedback Score: 53 reviews	i have no idea how to answer your question but one thing i do know is no one can answer how much RPM unless you tell us what engine you are running, and maybe where the red line sits at (not sure if redlines important). or well, yea i have no clue heh.

02-20-2009, 01:34 PM	#3
Master Chief Zilvia Junkie Join Date: Feb 2006 Location: Israel Posts: 332 Trader Rating: (3) Feedback Score: 3 reviews	Yep, sorry about that - its an SR20DET - 2L engine, i'll update the original post.

02-20-2009, 03:56 PM	#4
Sleepiedaze Zilvia Member Join Date: Sep 2008 Location: 619 Age: 43 Posts: 190 Trader Rating: (2) Feedback Score: 2 reviews	remove rear sway bar. lower rear tire pressure as you go. ex... start at 35 psi and go lower till you find a good pressure where the tires hook up nicely. if your running street tires there is no need for a long smokey burn out. spin the tires just to remove the dirt and anything else that was picked up. as far as RPM launch its all up to the driver. some like to launch off the limiter some like to feather the clutch just depends on you and your tire/HP. for street tires just rev it to about 2500 to 3000 and see how it responds.

02-20-2009, 04:33 PM	#5
Master Chief Zilvia Junkie Join Date: Feb 2006 Location: Israel Posts: 332 Trader Rating: (3) Feedback Score: 3 reviews	Do i need to remove the Rear Sway Bar completley, or is it enough just to disconnect the links ? How about the front Sway bar ? any benefit in removing the links in the front ? Any idea what kind of 1/4mile ET should expect ?

02-21-2009, 09:00 AM	#10
Master Chief Zilvia Junkie Join Date: Feb 2006 Location: Israel Posts: 332 Trader Rating: (3) Feedback Score: 3 reviews	Thanks guys, though i kinda of managed to remain confused as before...:-) How about the ET i might expect with my above setup ???

02-21-2009, 01:11 PM	#12
Master Chief Zilvia Junkie Join Date: Feb 2006 Location: Israel Posts: 332 Trader Rating: (3) Feedback Score: 3 reviews	No - but the car is in standard trim, wich means standard S14 weight, whetever it is - about 1250kg, i think.