My RB26DETT 240sx @ KCIR Drag Strip Times

[driftingmy240sx]

found the key to not breaking the 25 transmission is using a twin-disc clutch

[s14 2510's]

I know this old guy I met at the track once. Stock internal KA s13 he runs 11.4 in the quarter. He had to get a finger clutch made because he couldn't find any other clutch that wouldn't slip. He cut his radiator in half and made his own radiator and intercooler that take up half the space that they use to. He couldn't find any cheap 4 bolt drag rims for his slicks. So he cut to sets of rims up and welded them together to make them 2.5 inches wider. He made this billet finned block that goes before the throttle body. He claims it dropped his intake temp 30+ degrees. He found a Nissan truck aluminum drive shaft that was close enough to make a shim to use the tail end. Then he cut the front and had one with his ka splines put on. He has tein he's and bunch of stuff he made for the suspension. I wish i was old and had nothing better to do but mess with my car.
Modified by s14 2510's at 7:34 AM 11/19/2007

[JPsNissans]

well my best trap speed with my car was 111mph at gateway in st.louis, but anyways im running a j30 diff in my car wich is 3.92 gear ration instead of the stock 4.08 gear ratio and i was cutting 1.8 60ft times and i dont have a two step on my car so i just pretty much brake boost off the line at 7 psi and that around 4500 rpm and i was on bfg drag radials. but i was pretty happy with this time, this was the 3rd time i brought my car to the track and every time before this i ran in the low 13's with 2.1 60fts w/o brake boosting off the line. but im going to get the gizzmo launch interface two step and that should help me get out of the whole alot harder. my buddys s13 with stock rb26 ran a 12.8 with his car but theres room for improvement ill get some more track time when i get my two step. oh and i almost forgot im a pretty big guy so thats also a factor lol.

Is your rear end all stock except for the J30 LSD? If it is, I will feel alot better about my car at the track on Mickeys in the future.

[JPsNissans]

Well you should get alot better times, Wat kind of boost are you running topend?

I would think you could get at least a 1.5 60' on drag radials, Especially with boost off the line.

Good luck on your times, Give an update when you go back and run it.

His times are pretty good actually. There is no way in hell he is going to cut a 1.5-1.6 on those DR's. Not all DR's are created equal; size and compound play a big role and those are not going much harder off the line than what he is at. Maybe if he was on some tall and wide E/T Streets he'd have a chance at a 60 foot like that, BFGs do not equal M/Ts.

Good driving threadstarter.

[HxC_Nismo]

hey Hans, any updates on times from gateway?

yea at this years last midnight madness with my gizzmo launch interface and mickey thompson DR's i had my 2step set at 5400rpm and i was able to build about 3psi of boost off the line but once the light turned green i dumped the clutch and got 100% traction with 15psi in my DR's and i Snapped my weak 6 bolt rear driver side axle and was stuck in st. louis for another day. but i have swapped to the z32 n/a 4.08 diff and 5 bolt axles from my 6 bolt j30 diff. so i have to wait till next season before i can attempt it again. but i should of cut at least a 1.6-1.7 60ft if i didnt break an axle and probaly would of ran a 12.2-12.4 et is my guess. but i should hopefully hit 12.0 et with the 4.08 gears and gizzmo launch interface next season hopefully i will be tuning my car in the spring and should get about 375-400rwhp after tuning on the dyno

[HxC_Nismo]

Hey Hans, your friend with that ran the 12.8 at what psi? tires did he use?

he's running nitto drag radials and cut a 1.8 60ft with speed cut on his r32 rb26 s13. plus when i first ran my car i ran a crappy 14.8 with like a 2.4 60ft dont worry you will get into the 12's but once you hit the 12's you will know when you launch that you'll break the 12's cause your going to need to cut at least a 1.9 60ft to break the 12's in a stock rb26 s14 but to let you all know the MICKEY THOMPSON drag raidials hook the best compared to bfg dr's and nitto dr's. good luck man

[rb25drag]

yea at this years last midnight madness with my gizzmo launch interface and mickey thompson DR's i had my 2step set at 5400rpm and i was able to build about 3psi of boost off the line but once the light turned green i dumped the clutch and got 100% traction with 15psi in my DR's and i Snapped my weak 6 bolt rear driver side axle and was stuck in st. louis for another day. but i have swapped to the z32 n/a 4.08 diff and 5 bolt axles from my 6 bolt j30 diff. so i have to wait till next season before i can attempt it again. but i should of cut at least a 1.6-1.7 60ft if i didnt break an axle and probaly would of ran a 12.2-12.4 et is my guess. but i should hopefully hit 12.0 et with the 4.08 gears and gizzmo launch interface next season hopefully i will be tuning my car in the spring and should get about 375-400rwhp after tuning on the dyno

HAHA!!! Don't you just hate those 6 bolt axles? I done the same thing except I snapped both! But mine was under a 6400 launch! and 14 passes total on them.

[IMG][/IMG] http://i235.photobucket.com/al...2.jpg

If your hooking that good man you should at least be in the 1.5 60' range, I Cut a 1.67 60' on 8 inch drag slicks, and they only hooked about 98% it would slip about 2 rounds before hooking and going! of course im in the rb25, But still around 325-380WHP.

How did the Gizzmo workout for you? Im interested in buying one and was it hard to hook up?

[HxC_Nismo]

actually the gizzmo is pretty straight foward but i didnt use the reed switch they gave me cause i couldnt find any way to mount em so i just used a stock neutral saftey switch and it works perfect but you have to use the no lift to shift or it sputters if you let off the gas while shifting. also heres the link to the vid from kcir when i ran the 12.6 but remeber i was brake boosting off the line and i had really worn out bfg drag radials.http://youtube.com/watch?v=pUmVfM76sUAive upgraded since this vid to the gizzmo launch interface and z32 n/a diff with beefy 5 bolt axles and mickey thompson drag radials ill get vids of this set up once the drag strip opens up again next year.

[rb25drag]

Doesnt the No lift to shift have to be programmed into the ECU?

[Darius]

That is what the gizzmo launch interface is for. It keeps your revs from spiking when the clutch is depressed. So you just mash the pedal and keep it there when you shift so you don't lose boost. The exhaust will pop like a bastard between shifts, but who cares. It is definitely on my christmas list.

Hey Hans, why did you swap from a J30 to an N/A 300zx diff? I thought they had different housings with the J30 just being a bit longer due to the ABS sensor on the snout. Did you do it for the higher gearing?
Modified by Darius at 8:35 AM 11/27/2007

[rb25drag]

[QUOTE=Darius]That is what the gizzmo launch interface is for. It keeps your revs from spiking when the clutch is depressed. So you just mash the pedal and keep it there when you shift so you don't lose boost. The exhaust will pop like a bastard between shifts, but who cares.

I know how the Gizzmo works, as far as rev control, But there is a guy on LS1 I talked to that has an EVO and he programmed the no lift to shift into his ECU. So I was wondering if you will have to program that into the ECU or if its a program that comes with the Gizzmo?

[Darius]

Then yes it comes with the gizzmo as part of the rev control you know all about.

[HxC_Nismo]

That is what the gizzmo launch interface is for. It keeps your revs from spiking when the clutch is depressed. So you just mash the pedal and keep it there when you shift so you don't lose boost. The exhaust will pop like a bastard between shifts, but who cares. It is definitely on my christmas list.

Hey Hans, why did you swap from a J30 to an N/A 300zx diff? I thought they had different housings with the J30 just being a bit longer due to the ABS sensor on the snout. Did you do it for the higher gearing?

Modified by Darius at 8:35 AM 11/27/2007

well i swapped over the the z32 n/a diff wich bolts right up to the s14 and has the same leangth snout as an s14 open diff, but it comes with heat sink rear cover and uses stronger 5 bolt axles instead of the weak 6 bolt but its pretty much the same thing as the r33 gts diff but has a more oil capacity rear cover. and i just used 5 bolt axles from a 92-94 j30heres the pics of it installed on my carheres a pic of the 6 bolt j30 next to the 5 bolt 300zx n/a diffbut the junk yard i bought the axles from i might just pic up the diff from them also in case i want the 3.92 gears again im going to see how much of a gain i get at the track before i swap back to a j30

[Darius]

Have you had any issues with the diff being shorter than the J30 diff as far as the driveshaft is concerned? And why are the 5-bolt axles stronger? Are they a larger diameter?

[HxC_Nismo]

there alot thicker and heavier then the factory 6 bolt axles, and i didnt have any issues with my driveshaft cause i have a mckinney drive shaft and they work with either diff with no issues. i have not had any issues yet.