cjr198car Posted May 18, 2009 Report Share Posted May 18, 2009 My best and last run of the night, .042 N2O jet, 205-50-15 falken 512's set at 30 psi. Wheel hop/chatter for the first 15-20 feet (after the chatter stopped I started to spray). Second gear immediate spray (tires broke loose for a bit, the wrx driver I was racing said he could see the car get a little sideways). Third gear immediate spray, went through the traps at about 6000 rpm's. I think improvements could be made with: A. Install a WOT switch so I dont have to concentrate on the activation button. B. Use a stickier or wider tire (getting out of the hole was hairy with a 205 width street tire) C. More nitrous (going from a .040 jet to a .042 jet shaved .3 of a second (8.8 to a 8.5) off my ET. Im sure some of it was how I drove the last time, but in general the car "felt" a lot faster. Reaction - 0.348 60 - 2.157 330 - 5.660 ET - 8.586 MPH - 84.76 Here's a 1/8th mile to 1/4 mile conversion chart: http://www.fl-thirdgen.org/quartermileconversion.html If I can shave another 2-3 tenths (very possible with the improvement ideas above) I will be knocking down 12's in the 1/4...not bad for an autocross/roadrace setup :) Modifications: Bone stock VG30 (no cams, no headers, no internal, or external modifications less a cheap civic intake pipe and a cut out in the exhaust system) NOS universal dry kit with .042 jet TEC3 engine management -cjr198car Quote Link to comment
sssr20det510 Posted May 18, 2009 Report Share Posted May 18, 2009 I ran a 8.4 8th mile in my v8 510 (215 olds) but my 1/4 mile time was 14.2 and it would not gain traction till middle of second gear Quote Link to comment
72240z Posted May 18, 2009 Report Share Posted May 18, 2009 1/8 to 1/4 conversion charts aren't even close in my experience. You'll be running 12's when you actually run 12's in the 1/4. I'm not trying to be mean or anything I hope you run 12's. Just guessing you can run 12's with w/e mod or improvement having not a single real 1/4 time to work off is like pissing in the wind. Quote Link to comment
Cuts metal like mad Posted May 18, 2009 Report Share Posted May 18, 2009 Dave Lum had a hard time runnin 12s with his VG30DETT... but I can't remember his full setup, but I'm sure he at least had more than stock boost. Quote Link to comment
cjr198car Posted May 18, 2009 Author Report Share Posted May 18, 2009 (edited) Just wanted to share info. SSSr20det do have your time slip (I would be interested in the 60 foot, 330, and mph). I know a conversion chart is not always accurate, but I thought it may be a good gauge for guys that only know 1/4 mile times vs 1/8 mile times. If anyone has any old time slips with hard times that would be a good comparison for me. Thanks! Edited May 18, 2009 by cjr198car Quote Link to comment
sssr20det510 Posted May 18, 2009 Report Share Posted May 18, 2009 I dont this was years ago, I know the 60 ft time was real good i think 1.48?? mph was 94 mph i think, It came out of the whole real good but top end was not there I remember i raced a pinto that had a v8 and slicks and beat him till i hit third then he blew by me. Quote Link to comment
cjr198car Posted May 18, 2009 Author Report Share Posted May 18, 2009 the 60 foot sounds way too fast (cars with slicks run those type of 60 foots and you mentioned you were losing traction). The 94 mph sounds like a 1/4 mile trap (if that was an 1/8th you would be running much lower ET's). It would be fun if anyone had a few time slips to post. Quote Link to comment
sssr20det510 Posted May 18, 2009 Report Share Posted May 18, 2009 that was the quarter, i said 60ft was really fast i never got beat out of the whole through second gear even by cars with slicks Quote Link to comment
cjr198car Posted May 18, 2009 Author Report Share Posted May 18, 2009 (edited) Heres a fellow 510 owner (David Lum). These are his times: 1/4 Mile ET: 12.782 1/4 Mile MPH: 113.990 1/8 Mile ET: 8.491 1/8 Mile MPH: 89.270 0-60 Foot ET: 2.167 These are my times: Reaction - 0.348 60 - 2.157 330 - 5.660 ET - 8.586 MPH - 84.76 http://www.dragtimes.com/Datsun-510-Timeslip-12786.html I saw this car in person at shasta in 2003 (i believe) and can tell you his VG30DETT is atleast a 100-200 hundred pounds heavier than my VG30 (turbos, intercoolers, piping add up fast in the weight department). I stand by my first post and will be going for 12's when I get to the 1/4. sssr20det, I think you may have ran a 9.4 in the 1/8 and a 14.2 in the 1/4. Edited May 18, 2009 by cjr198car Quote Link to comment
Phlebmaster Posted May 18, 2009 Report Share Posted May 18, 2009 Nice!! That's it...I'm getting a VG for my truck. lol Quote Link to comment
72240z Posted May 18, 2009 Report Share Posted May 18, 2009 100lbs = 1/10 of a second in the 1/4 That 2/10sec is pretty inconsequential when compared to the nearly double hp/tq he puts down over your "lighter" motor. Again you can't just guess, comparing someones actual 1/4 to your 1/8 is meaningless. I'd love to hear you do it but until then I find it really far fetched. Quote Link to comment
datzenmike Posted May 18, 2009 Report Share Posted May 18, 2009 (edited) Wheel hop/chatter for the first 15-20 feet (after the chatter stopped I started to spray). I think improvements could be made with: A poor launch will require a lot of power to recover from at the top end. Being beat out of the hole means you are playing catch up all the way to the end. Fix your wheel hop/chatter and gain a third second or more. Beware too much tire/traction it will increase wheel hop in many cases. Experiment with lower tire pressures and compare 60 ft times to see if there is an improvement. Keep a record of the pressure and track surface temperatures. Don't forget smoky burnouts will raise the tire pressure. Lower pressures usually increase traction. More tire could allow even lower rear gears allowing a higher RPM 3rd gear in the traps Edited May 18, 2009 by datzenmike Quote Link to comment
cjr198car Posted May 18, 2009 Author Report Share Posted May 18, 2009 (edited) 72240Z, -2/10 a second is a ton of time in the 1/8 or 1/4 (100-200 pounds is a big deal in any form of racing). -You have no clue what im putting down for power unless you have some telepathic powers to know what a .042 jet of N20 adds to my stock VG. -Do you know what David has for power (I remember a stock vg30dett with top mount intercoolers and stock turbos with a bit more boost)??? -Compare the 1/8 mile times and you'll see Im less than 1/10 a second off David's 1/8 mile time (.095). -cjr198car Edited May 18, 2009 by cjr198car Quote Link to comment
cjr198car Posted May 18, 2009 Author Report Share Posted May 18, 2009 (edited) Datzenmike, Thanks for the input. I launched the car quite a few times that night and found 30 psi to be the best (I drove around the water box and did a quick spin to clean the tires). I think I might need to raise the front and rear of the car (I slammed it for looks and the negative camber in the rear is decreasing contact patch) for better weight transfer and maybe a slightly stickier tire. I have Falken Azenis 195-60-14's, but I think sacrificing tread width for a stickier tire will just cancel out the benefits of both. I found that hoosier makes a 205-50-15 in a few compounds. That might be the ticket...Keep the Falken Azenis for the autoX. -cjr198car Edited May 18, 2009 by cjr198car Quote Link to comment
fastdadd Posted May 19, 2009 Report Share Posted May 19, 2009 Nice!! That's it...I'm getting a VG for my truck. lol if you do you have to put quad carbs on it:lol: Quote Link to comment
benzo Posted May 19, 2009 Report Share Posted May 19, 2009 I say for now don't do any engine mods just work on suspension or go slicks or drag radials and try to shave those 60 foot times. once you get that down and get good seat time start working on increasing power or more top end to get those high traps and lower times. good luck Quote Link to comment
510six Posted May 23, 2009 Report Share Posted May 23, 2009 With an all JY parts 3 liter with a 120 rwh N20 shot my 510 ran a best of 12.55@110 on 24.5x13x7 slicks. The problem launching a 510 is that the rear trailing arms cause the tires to "toe" out and scrub speed, the solution was to use a modified rear crossmember and set the camber and toe to reduce the tire scrub. With my first setup this resulted in a 1.7 second 60 foot time and a mid 12 with 256 rwh. The second setup used the same size slicks but used air bags in the rear springs (40psi) and a 14x6 libras in the front with 165/70/14 tires. The motor used the same nitrous shot but the motor was a built turbo 3 liter stroker with a small T4. The 60 foot times dropped to a best of 1.62 and resulted in a best 1/4 mile time of 10.96 @127 with 535 rwh. The trick with a 510 is to weight transfer to the rear without scrubbing tires or loosing control. Currently I use a set of proshock coilovers with 50lb springs in the rear in addition to the above modifications, to assist with weight transfer a set of 90/10 front struts were made with stock 4 cyl springs.This helps transfer the weight of the car onto the slicks and resulted in a best 60 foot time of 1.58. What I would suggest is using a set of drag radials and using a set of stock front springs. If the rear crossmember can be adjusted I would set the rear toe to 1/16" and you want your Camber to be at least a degree more positive than for s street setup and the caster should be setup a degree positive as well. This will help to weight transfer and help the tires bite off the line. Quote Link to comment
cjr198car Posted May 23, 2009 Author Report Share Posted May 23, 2009 Thank you 510six. That answers alot of questions for the rear setup. -cjr198car Quote Link to comment
510six Posted May 23, 2009 Report Share Posted May 23, 2009 (edited) I can post some pictures of my rear crossmember and trailing arm setup (if you would like). The crossmember was made by a friend at Raver Motor sports and has complete adjustment for camber/caster and toe. Edited May 24, 2009 by 510six Quote Link to comment
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.