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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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10-26-2009, 11:13 PM | #1 |
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drag racing suspension
i had tein hr coilovers with 15X8 welds with 275/60/15R nittos drag radials at 12 psi, anit lag and 400whp. the car is a s13 hatch.
now its all the same but i have stock shocks and springs. my best 60' is 1.89 on the coilovers and 1.73 on the stock shit. im getting new m/t et streets very soon. what else can i do to lower my 60'? coilovers again? adjust something? any help is good.
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10-26-2009, 11:40 PM | #2 |
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lower the new et streets down to 11psi.. you should break a axle or the tranny if they are still stock...
install subframe spacers.. and maybe go auto, if you have the money..
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10-26-2009, 11:52 PM | #3 |
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i have dds axles and a 300zx/mazworx trans. my drivetrain is good for over 600hp all around.
i was thinking of getting subframe spacers. they are to get rid of the wheel hopping right?
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WORLDS FASTEST T-2 TURBO 240 ON 93 OCTANE! 10.79 @ 124 MPH WITH A 1.48 60' |
10-27-2009, 12:07 AM | #5 |
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i no longer have the coilovers. i have no sway bars. my susp. is completely stock. i have the anti lag set perfect for the way it sits now. i know that i need new tires. i was looking at sub frame bushings and spacers and staying with the stock shocks and springs
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WORLDS FASTEST T-2 TURBO 240 ON 93 OCTANE! 10.79 @ 124 MPH WITH A 1.48 60' |
10-27-2009, 03:02 AM | #7 |
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You should've kept your coilovers and bought new springs and then had them revalved for drag. Tein will revalve them for around $100 per shock. I'd def get some subframe spacers. What is your alignment like?
Or you could get some HKS drag suspension.
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10-27-2009, 03:10 AM | #8 | |
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Quote:
they will help for sure.. o yeaa put your alignment to 0.. and put the et streets to 11psi.. the tires you are running right now suck!! get a 26-10.5-15 et street..
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10-27-2009, 03:29 AM | #9 |
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You gotta tell us what you have so we can tell you what to improve. LSD? Motor mounts? 1 piece axle? All that stuff would help tremendously. A list of what has been done in this situation would be ideal.
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10-27-2009, 05:12 AM | #10 |
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If you want a lower 60, i suggest you get some slicks.
nothing crazy just an 26x8.5x15 or a 26x10. my best 60 with stock suspension and a 26x8.5 is 1.59. thats with the stock tranny and a vlsd. I just picked up Kw variant 3s for my drag set up, their in the car but it hasnt hit the track yet. |
10-27-2009, 05:29 PM | #11 | |
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Quote:
i know i need new tires. the nittos blow and are shot. but even when they were good my 60' was 1.7. i am getting the m/t et streets. i also am going to get subframe bushings and spacers. ill look into the hks drag suspension. anything else recomended? i do need a front end alinement. do they do the back too?
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WORLDS FASTEST T-2 TURBO 240 ON 93 OCTANE! 10.79 @ 124 MPH WITH A 1.48 60' |
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10-27-2009, 05:42 PM | #12 | |
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if you wanna adjust the back your gonna have to get adjustable ruca's and basically replace traction rods n stuff in the rear so they can become adjustable.
i say screw the spacers get solid mounts for your subframe. more likely your stock bushings are welldone. also do solid/polyerethane bushings for your suspension. possibly a short shifter would help (i cant tell if you have auto or manual 300zx trans) test and adjust the gearing (rear end) also thats more proportionate to your setup.
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10-27-2009, 05:49 PM | #13 | |
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Quote:
btw best run was 1.73 60' 11.74 @ 118 mph. i have trapped 120 but my tire pressure was at 15. those runs it was at 9psi
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WORLDS FASTEST T-2 TURBO 240 ON 93 OCTANE! 10.79 @ 124 MPH WITH A 1.48 60' |
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10-27-2009, 06:36 PM | #14 |
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Soft springs/struts out-back and run the opposite up-front. Adjusting the rear camber to zero would increase the amount of rubber on the track as well. I would also suggest getting anti-squat bushings, I know I've seen them somewhere for the S-chassis.
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10-27-2009, 06:59 PM | #15 |
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but dont you want squat with a drag car??
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WORLDS FASTEST T-2 TURBO 240 ON 93 OCTANE! 10.79 @ 124 MPH WITH A 1.48 60' |
10-27-2009, 10:59 PM | #16 | |
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damn... jeff(nismoknight) can correct me if im wrong but i believe a local (cerio) ran a 10.7x with around 400hp(pistons,2871, z32 trans, etc) im not sure what tire he runs i think he runs et streets. maybe jeff could chime in and help out. you should be running better times. |
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10-28-2009, 03:03 PM | #20 |
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^^^^ your kidding right?
i used to drive there too, on street tire, then I take 10 mins out of my day and change my wheels, and cut 1.5 1.6 60s all day. |
10-28-2009, 03:36 PM | #21 |
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Yes and no. Too much of it can hurt camber angles and take away traction. Not enough squat will induce wheel spin, you have to find the perfect median. Like I said I think someone sells ones you can adjust, I.e. add a spacer and take away one to dial in the perfect setup for your car.
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10-28-2009, 03:37 PM | #22 |
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The link I posted, second one down.
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10-28-2009, 08:23 PM | #23 |
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those were the ones i was looking at getting.
i drive my car on the street with my welds on it. so i have to go with a street tire. i would love to do a slick but ill get pulled over every 5 minutes instead of 10. that 240 with 400 that went 10, what tires he running, psi, car weight? those all play a factor too. too low of a psi like i have to run now with my nittos kills my mph. from at 9psi my mph was 116 and at 12psi it was 119
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WORLDS FASTEST T-2 TURBO 240 ON 93 OCTANE! 10.79 @ 124 MPH WITH A 1.48 60' |
10-28-2009, 10:03 PM | #25 |
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no 12 psi was my tire presure. sorrry about the confussion. im running 18 psi on my turbo.
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WORLDS FASTEST T-2 TURBO 240 ON 93 OCTANE! 10.79 @ 124 MPH WITH A 1.48 60' |
10-28-2009, 10:21 PM | #26 | |||
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Not really.. all the drag v8s have really stiff rears… Quote:
not 10.7 but yes he was in the 10s.. hes on a full slick.. and about running better times, it all depends on the track/weather/tires/shifting/boost/ect.. Quote:
Because et streets are the same as slicks almost.. just street legal and they do not grow.. best street/track tire.. Quote:
That 240 has slicks.. and is max psi for a gt2871r.. dude mph doesn’t matter really.. My s13 went 10s with 116mph... Worry about the car hooking first and then worry about mph..
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NismoKnights Terrorizing Honda crews since 2003 ls2 powered kouki..all show and GO! putting it down on the streets and the track! LMAO V8 Nismokights on http://www.youtube.com/user/NismoKnights |
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12-02-2009, 11:08 PM | #27 |
Zilvia FREAK!
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just to follow up.....
i was at the track on nov. 4th for imports vs. domestics and mickey thompson had some 275/60/15's on sale so i got them mounted at the track. turned my anti-lag to 5k, tire presure at 16psi and heated the tires up a little bit. launched the car and BOOM broke my dss 600whp axle. no wheel hop, just saw the front come up and down real fast. i moved a total of 7" off the line. haha i found traction. so now i have to get it repaired and try again next season with my 600whp set up im doing in the off season. also i have to roll the rear fenders for the tire to fit. thanks for all the help. m/t ftmfw!!!!
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WORLDS FASTEST T-2 TURBO 240 ON 93 OCTANE! 10.79 @ 124 MPH WITH A 1.48 60' |
12-03-2009, 06:17 PM | #30 | |
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Quote:
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