BRAD D Posted December 8, 2002 Share Posted December 8, 2002 Will BFG g-force drag radials 225/45 R17 and a RB26 pushing 400HP at the tires be a problem at the track, I'm shooting for low 11 sec 1/4's for now, is it going to be possible? That is if they let me on the track with no door handles? here is some info on the car 1973 240Z (-) = I have (*) = I want / need motor - R33 RB26DETT - 3†stainless exhaust with Dynomax Ultra flow muffler - Stock fuel tank modified - Apexi GTR intercooler (on back order) - Areomotive 700hp coffee grinder / fuel pump - SDS computer - HKS boost controller - HKS blow off valve * two K&N filter transmission - GTS-T 5 speed - quick shifter - O.S clutch diff * LSD r200 * ZXT CV’s body - House of color “Kandy Organic Green†- shaved marker lights and door handles - tint - Xenon air dam interior - Momo steering wheel - Momo shift knob / boot - laser cut aluminum fan / vent / heat / five 2-1/8 gauge panel -/* Auto meter gauges ten of them (I only have a air/fuel and exhaust temp at the present time) - Viper alarm * roll bar * Corbeau seats / belts wheels / suspension / brakes - Motegi MR7 17x7 wheels - BFG g-force drag radials 225/45 R17 - Ground Control coil overs - Tokico 5-ways - Energy suspension bushings - SCCA rear 240sx /300zx rear brake kit www.rb26dett.freeservers.com Quote Link to comment Share on other sites More sharing options...
BLKMGK Posted December 9, 2002 Share Posted December 9, 2002 Can you bump up to 245? I'm pretty sure that's what I've got under my rear fenders and any added traction you can get would be good. I never really got on my car very hard as I was breaking rear bits but spinning over 555R Nittos wasn't hard and they were 245s! Quote Link to comment Share on other sites More sharing options...
BRAD D Posted December 9, 2002 Author Share Posted December 9, 2002 I'm so use to 4x4 tires, like 36x14.5 will fit good on a 10" or 12" wide wheel. But I'm lost when it comes to sports cars (my first car is this Z, only had lifted trucks before and this one now in the photo) so a 245 will fit nice on a 7" rim? Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted December 12, 2002 Share Posted December 12, 2002 no a 245 will not fit. try www.tirerack.com Quote Link to comment Share on other sites More sharing options...
Bob_H Posted December 12, 2002 Share Posted December 12, 2002 Brad, Assuming you stick with your current rims, 235 is the largest you can really run on a 7in rim. Needless to say you will have traction issues. I would suggest getting everything running first, take it to the strip with the existing rims/tires second. Then run it and see what the problems are. Then I would invest in a second set of rear rims that are backspaced to get you up to at least an 8 in, or a 9 or 9.5,(look at Pete P for that spec, basicly coilovers and a certain backspacing). That will allow a bigger tire. For stock fenders, I would run a 9 in rim and run the extra tire,(likely 255 is as big as you can go in the rear w/o hitting the fender, assuming it is rolled). If you go to a 9.5 in rim like Pete, you will have little sidewall for the Drag radial to flex. And BTW, it turns out my motor won't be in till the 17th, so no clutch for you till at least then. And in reality, it will take some time for me to get it out of customs. I will try to get it out before I leave for my parents and Christmas,(the 20th), but if I don't, then you'll be waiting till the 3rd of Jan. -Bob Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted December 12, 2002 Share Posted December 12, 2002 To extend on Bob's response, I had no traction with 275/40-17s after consistent low-1.60s with 275/50-15 and 255/50-16. The sidewall is just too short and stiff, but since you already have them, give it a shot. As a comparison, RickB is spraying a SBC and ripping off the line with 235/60-15s. I ended up doing as Bob is advising. If they do not work, get a pair of 15" rims and and run the 235/60-15 DRs at the track. On the street you will need those DRs unless you like showing how you can spin tires . However, I wonder how much better the newer BFG DRs are in the wet and tread wear? The older ones were horrible. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted December 12, 2002 Share Posted December 12, 2002 Originally posted by Scottie-GNZ: However, I wonder how much better the newer BFG DRs are in the wet and tread wear? The older ones were horrible. I ran the G-Force DRs on the street for a bit this fall (215/60/14). I absolutely hated the soft sidewall, I always felt like I had to granny around the turns (they stick, but they are sloppy). I also drove them a bit in the wet with no problems, but I was, of course, taking it a bit easy. They seem to be ok... Quote Link to comment Share on other sites More sharing options...
BRAD D Posted December 15, 2002 Author Share Posted December 15, 2002 My fenders are not rolled, so how wide could i go? i will switch to 8" springs for more clearence. Bob H dont worry about the clutch, I'm in no rush. just got my areomotive 700hp fuel pump and filter. and ordered a the new HKS EVC. GNZ i had the tires and rims on my girl's 02 civic, and the DR's were better in the wet than the stock tires that came with the car. seriously. Quote Link to comment Share on other sites More sharing options...
Lone Star 1 Posted December 15, 2002 Share Posted December 15, 2002 I also am running 215 60 R14 BF Goodrich DR's. I had heard they were bad in the wet, so I was very careful at first, but have found them to stick better than my street tires in the wet. At the track I am almost dead hooked, and run 1.74 60's. I wish I could find some 15" pansport whells with 15 to 20 mm pos offset so I could run 235 60 R15 BFG's. I have to leave the line at 700RPM now to keep traction. If I try to raise the rpm, then the tires will spin a couple of revelotion causing 1.9 60's Quote Link to comment Share on other sites More sharing options...
BRAD D Posted December 15, 2002 Author Share Posted December 15, 2002 So back to my question of how fast, what do you think the best 1/4 time a pro (like Scottie-GNZ)could pull off in my car. AS is , well when it is up and running? I would like to think mid 11 sec's? Am i out of wack to say that? Quote Link to comment Share on other sites More sharing options...
skyline240z Posted December 15, 2002 Share Posted December 15, 2002 Hi Brad, I have a RB26 in mine also, I have 255-40-17 in the back. Have not taken it out to the track yet, I'm sure it will do low 11's. It's going to a buyer in San Diego, so he'll be getting back to me on how it does. Rick Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted December 15, 2002 Share Posted December 15, 2002 To predict the 1/4 time/speed, I have to make some assumptions: - the car weighs 2,700lbs w/driver - you can cut at leat a 1.80 60' - it really does have 400rwhp With that it should go 11.20s @ 123-ish Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted December 15, 2002 Share Posted December 15, 2002 I don't have an RB26, but twinturbo L28 with NOS. I don't know if it was track prep, but the Nitto 275-50/15's did not hook for crap in Montegomery. I was spraying 100shot nitrous and 10psi out of the hole and spinning the tires every time. I could only muster a 1.9 60ft with 11.2@129.45. I suspect the nitrous played a roll in the problem. The nitrous hits so hard I think the tire cannot handle such a quick transition from still to moving. This was also with an auto trans, so it was not like I droped the clutch. I doubt this helps, but I think you will want to get some slicks! Quote Link to comment Share on other sites More sharing options...
skyline240z Posted December 16, 2002 Share Posted December 16, 2002 Hi Brad. Just sold my other turbo z today. I've always loved z cars, so The next car will be a z again. Hopefully I can start a new project soon. Keep in touch Rick Quote Link to comment Share on other sites More sharing options...
BRAD D Posted December 16, 2002 Author Share Posted December 16, 2002 Scottie-GNZ I think i should have around 400HP but we will see. I'm running it on a dyno to tune it, so i will know then. i was just going by stony's #'s, but he dose have bigger 680cc injectors. i think mine are around 440cc. stony's dyno slip and will it be hard to pull off a 1.80 60' with my 225 DR's? because 11.20 sec is how fast i would like to be, i think that is fast enough me. Quote Link to comment Share on other sites More sharing options...
BRAD D Posted December 16, 2002 Author Share Posted December 16, 2002 hi Rick, i e-mailed you a long time ago about your swap. I'm in Winnipeg. So are you out of the Z car thing? are you also selling that silver turbo Z? Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted December 16, 2002 Share Posted December 16, 2002 It is a lot easier (but more expensive) to make more HP for a big MPH than it is to get the car to launch hard for a quicker ET. ET wins races, MPH is a HP indicator and bragging rights. I had no success with 17" Nittos (275s) and I doubt the 225s will do the job with 400rwhp. Try it and then decide. If you are going to get a 2nd pair of tires for the strip, then do what I did and get a pair of Hoosier QTPs. They are DOT-legal but you do not want to be driving on the street with them a lot. I live 9 miles from the track and they never see an inch of road beyond that. However, throwing those on will not guarantee you 1.45s like I am getting. Getting the suspension set up is also key. The average street shock is going to compress/rebound normally and that is not what you want for the strip when looking to break into the 10s. A street car will need adjustable shocks, like Illuminas, or sacrifice the launch with wheelspin or worse, wheelhop. You want the front to rebound quickly and compress slowly and the rear to compress quickly and rebound slowly. This will give instant weight transfer and not unload the rear too quickly. Ever see a turbo launch then start spinning the tires 20' out when the big boost comes on? The Illuminas allow you to make that suspension adjustment for the strip and back to carving canyons if you have to. Thats one of the main problems with your car James. Even spraying out of the hole, I doubt your setup has more low-end torque than mine, yet I was cutting low-1.60s on a t-brake with the same DRs you have with nary a trace of wheelspin. If you are serious about getting QUICK ETs, then think about this: for every .1 on the 60' you affect the ET by .15. The first 1/8-mile is spent building acceleration and the 2nd half is for top-end MPH. With your 11.2 you are going to spend ~7.15 to run the 1/8-mile and ~4.14 to run the 2nd half. How important is the launch in drag racing? BTW, lets not start the rear-end squatting debate again Quote Link to comment Share on other sites More sharing options...
BRAD D Posted December 22, 2002 Author Share Posted December 22, 2002 So what settings should i have my Tokico 5-ways on? And with stock fenders what Weld Draglite and tire size will fit, if i get 8" rear coils for my G-C's Thanks for all your input. Quote Link to comment Share on other sites More sharing options...
BRAD D Posted December 22, 2002 Author Share Posted December 22, 2002 Oh, and Scottie-GNZ What size fuel line do you have? my new pump's inlet is -8 and exit is -6 and it is rated for 700HP. I'm in the middle of making a sump on my stock gas tank. i was going to dump out of the sump with two -6's in to one -8 into my filter then through my pump and exit the pump at -6, to the rail past the regulator and back to the tank with a -6. thanks Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted December 22, 2002 Share Posted December 22, 2002 I still have the fronts and set them to "1" for the strip and "3" for the street. If I recall, the rears were set the same way. Can't believe I have already forgotten. Must be having "senior" moment . I currently run -8 inlet and the stock 240 inlet for my return. I would imagine 5.5" BS should work but maybe someone who has that same combo can chime in. Quote Link to comment Share on other sites More sharing options...
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