1/4 mile launching techniques? - Page 2 - ZR-1 Net Registry Forums

rkreigh · 04-07-2010

you want the weight transfer but the c4 independent rear doesn't maintian the best camber to keep the full tire plated when it squats

I worre the inside edges of the gy run flats out pretty quickly at bg making runs.

a flexibly sidewal tire takes the dump of the clutch and wraps up the tire more and will plant "at non optimal camber" angles must better

the really high power cars are a bit squirley, and the c beam flexes unloading one tire more than the other from the diff twisting

hook hard and roll on the throttle rather than dumping the clutch has been the only think that works which infolves slipping the clutch and then putting it to the floor after the 60 ft. eve then sometimes it breaks loose

with the hoosiers, I can come out hard! hope to see a 1.6 and not break anyting with a more talented clutch foot

f1s are lousy drag tires, don't like em on the street either. they handle well but don't hook up even with the 325 c6 size

XfireZ51 · 04-07-2010

Ron,

I guess I get to try the 19" 325s and see. I have found that Performance works better for launch. Mine has the Marracca valved shocks. Any thoughts on launch with lowered rear?

jonszr1 · 04-08-2010

on my white 92 which is about 11/2 in lower than standard but also has coilovers .i lowered the bump stop on each side so that the half shafts didnt go into the negative angle as bill told me thats a good way to break things . i use the middle setting on the fx3. i am still getting used to the new nitto drag tires (nto5r) they show great promise though. its looking that 26-24 are going to be the best pressures to run with these tires and leave around 3500

rkreigh · 04-08-2010

setting up the car for the digs involved some real compromise for handling

in essence, you can have a good drag car, or a car that handles

the FX3 can be setup with the custom controller (removable control chip) to allow front shocks soft and rear stiff to allow weight transfer, but not too much squat. I like the limiting idea on the bump stops, and also unbolting the front sway bar end links helps "free up" the travel

don't even bother on the supercar F1s, the sidewalls are rock hard and really only a good drag radial is worth going out there. street tires just don't cut it unless you really finesse the throttle and clutch

those NT05Rs look really good, but the 19' small sidewall hurts the launch as you want a "tall" tire with a deeper sidewall give to allow the rear tires to bite, but certainly they are going to hook pretty well

really a slick is what you need, but the zr-1 spindles and half shafts are "vulernable" when launching hard and hooking

great thread, Pete, where are you buddy

pete, haibeck, and my buddy phil can drive pick up several tenths on me anyday. practice and the nut behind the wheel make a huge difference

jonszr1 · 04-08-2010

where can one get a custom controller????

Paul Workman · 04-10-2010

Quote:

Originally Posted by jonszr1

on my white 92 which is about 11/2 in lower than standard but also has coilovers .i lowered the bump stop on each side so that the half shafts didnt go into the negative angle as bill told me thats a good way to break things . i use the middle setting on the fx3. i am still getting used to the new nitto drag tires (nto5r) they show great promise though. its looking that 26-24 are going to be the best pressures to run with these tires and leave around 3500

I appreciate your (all others too) comments. Is your launch at 3500 is with a light weight (Al?) FW, right?

P.

jonszr1 · 04-10-2010

yes, its 3500 with the mickeys , i just got off the phone with the nitto guys and found out i should try going to 27-30 lbs and try going up 500 rpm .which i will do tomarrow at the summit series race at famoso, during the practice runs . if you are going to use street tires and a fidanza flywheel i would suggest starting off around 2000 and step up from there in 200 rpm incraments . get a legal pad and keep good notes of each run . i fo that and use a gtech pro rr that has a download program that shows wheel spin, exact shift rpm, length of time it takes me to shift.plus a bunch more stuff. it also has a shift light . i really like it . plus you can use it off the strip ifyou want to try something away from the track.hope this helps

04-07-2010	#11
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,087	Re: 1/4 mile launching techniques? you want the weight transfer but the c4 independent rear doesn't maintian the best camber to keep the full tire plated when it squats I worre the inside edges of the gy run flats out pretty quickly at bg making runs. a flexibly sidewal tire takes the dump of the clutch and wraps up the tire more and will plant "at non optimal camber" angles must better the really high power cars are a bit squirley, and the c beam flexes unloading one tire more than the other from the diff twisting hook hard and roll on the throttle rather than dumping the clutch has been the only think that works which infolves slipping the clutch and then putting it to the floor after the 60 ft. eve then sometimes it breaks loose with the hoosiers, I can come out hard! hope to see a 1.6 and not break anyting with a more talented clutch foot f1s are lousy drag tires, don't like em on the street either. they handle well but don't hook up even with the 325 c6 size __________________ 95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP)

04-07-2010	#12
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,709	Re: 1/4 mile launching techniques? Ron, I guess I get to try the 19" 325s and see. I have found that Performance works better for launch. Mine has the Marracca valved shocks. Any thoughts on launch with lowered rear?

04-08-2010	#13
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: 1/4 mile launching techniques? on my white 92 which is about 11/2 in lower than standard but also has coilovers .i lowered the bump stop on each side so that the half shafts didnt go into the negative angle as bill told me thats a good way to break things . i use the middle setting on the fx3. i am still getting used to the new nitto drag tires (nto5r) they show great promise though. its looking that 26-24 are going to be the best pressures to run with these tires and leave around 3500

04-08-2010	#14
rkreigh Join Date: Jan 2004 Location: Alex VA Posts: 1,087	Re: 1/4 mile launching techniques? setting up the car for the digs involved some real compromise for handling in essence, you can have a good drag car, or a car that handles the FX3 can be setup with the custom controller (removable control chip) to allow front shocks soft and rear stiff to allow weight transfer, but not too much squat. I like the limiting idea on the bump stops, and also unbolting the front sway bar end links helps "free up" the travel don't even bother on the supercar F1s, the sidewalls are rock hard and really only a good drag radial is worth going out there. street tires just don't cut it unless you really finesse the throttle and clutch those NT05Rs look really good, but the 19' small sidewall hurts the launch as you want a "tall" tire with a deeper sidewall give to allow the rear tires to bite, but certainly they are going to hook pretty well really a slick is what you need, but the zr-1 spindles and half shafts are "vulernable" when launching hard and hooking great thread, Pete, where are you buddy pete, haibeck, and my buddy phil can drive pick up several tenths on me anyday. practice and the nut behind the wheel make a huge difference __________________ 95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP)

04-08-2010	#15
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: 1/4 mile launching techniques? where can one get a custom controller????

04-10-2010	#17
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: 1/4 mile launching techniques? yes, its 3500 with the mickeys , i just got off the phone with the nitto guys and found out i should try going to 27-30 lbs and try going up 500 rpm .which i will do tomarrow at the summit series race at famoso, during the practice runs . if you are going to use street tires and a fidanza flywheel i would suggest starting off around 2000 and step up from there in 200 rpm incraments . get a legal pad and keep good notes of each run . i fo that and use a gtech pro rr that has a download program that shows wheel spin, exact shift rpm, length of time it takes me to shift.plus a bunch more stuff. it also has a shift light . i really like it . plus you can use it off the strip ifyou want to try something away from the track.hope this helps