LMAO-weird coming from Jeremy-that heat in FL is getting to his head

 

 

https://my350z.com/forum/showthread....78#post2918578

 

I think the optimal shift pattern is 2, 4, 6. That way you have the benefits of the 2nd gear launch and only 2 shifts to worry about. That should shave .5-.7 seconds off per shift, meaning your car would definately run in the 10.5-10.1 range... You are knocking on 9s if you take my advice!

 

Really? But getting a fast and clean 2-4-6 shift seems like a monumental task. Has anyone tried this before?

 

He is joking bro...

 

This all started with my ida of launching in second gear, my thinking behind it is if you have the torque to pull the longer gear, you will reduce shifting one gear in the over all quater run, and eliminate wheel spin off the line, people said it was a retarded idea but to be honest i still think it would work with the right clutch , yes it will definatly put some wear on it but I think it will also reduce the et but as much as 3 tenths maybe more.
I did try it in my z and fopund a few things out, one first gear with 19/285/35 is only good for 35 mph before i hit the red line, two the car can pull second but doing so did smoke the clutch a little , being stock im not surprised, I was able to get a decent launch from about 4500 rpm with only a minor chirp and it bogged a lil when clutch was full released it did bog only slightly again at stock hp not surprised, however i was able to pull 74 mph with out shifting and i believe in less time than if i would have gone through two gears btw felt like about 5 second even to 60 when Nissan says its 5.9 0-60 but its kind of hard to count seconds drave and watch tach and speedo all at same time.. I will get a buddy to ride with me next time and use a stop watch to get a better idea of how realistic my findings are..

There is some info im having a hard time finding : the gear ratios of the trany for each gear and the rear end gear ratio, with those and tire diamters along with hp and torque i can use my drag calculator to get a true estimate of how if at all this will work..

 

WHY DONT YOU JUST CHANGE YOUR REAR GEAR RATIO???

an auto gearset or g35 auto

 

Who is spinning here? Ever heard of slicks or drag radials? Brians 1.65 60ft sure did hook, it will only get better with warmer temps, drop the skipping gears/starting in 2nd idea its absolutely ridiculous...also no way you got 74mph out of 2nd gear, its only good to 62mph @ fuel cut...top speed in each gear wont change because you start in a gear sooner.

 

yeesh, this 1fish guy is cracking me up...

BTW we were just starting an auto G35 diff swap in brian's car when we realized the donor car didn't have VLSD so he didn't go through with it.

 

Like i said it was hard to see exactly what the mph was i was more worried about the rpm then the mph (in other words your probably right about the top speed in 2nd i wont argue you there), and yes ive definatly heard of dr and slicks drag radials should be spinning hard with the hp/tq your at, slick no but no one has said anything about using slicks if they were they would have a bteer understanding of tire diamter expansion and growth at trap.
Guys im not a kid here i have been racing for over 30 years (I managed Super Shops for 9 years and worked as a designer builder at Johnnys Speed n Chrome for 4), I am introducing a new concept to you the tranny in the z is a very close ratio gear set, with a very short first gear.
Alberto i have respect to you for your car and the money you have spent to get where you are (really enjoyed the video of your 80-160 run)( I would at least consider air bags to start with for drag racing it will greatly reduce the intial squat encouraging better weight transfer), 20 years ago people would be laughing at you if you had told them you would get 550 hp from a japanese car and a 6 cylinder engine, take a moment to calculate what i am saying, if i can ever get some numbers to crunch it may or may not calc out. I believe it will, think about it using a glide when you shift the rpm does drop alot then the car gets back into its curve alot has to do with the stall converter but just as much to do with tire diameter and gear ratios. A car of equal weight and hp/tq and traction using a two speed will walk a six speed all day long on a 1/4 mile track..

Nealoc187 Im glad your being well entertained...

 

RAWR what about me I have the 3.917 Gears and FI...my 1st gear is stupid but all others on the Highway are fun...

I think 2nd goes to like 55 mph

 

Wrong again. The same day I ran the time in this thread I also ran a couple 11.6s with my 18in drag radials. They dead hook too, I just can't launch them as violently as the ET streets. I've still pulled a 1.70 60' out of the DRs and a bunch of other low 1.7s.

Drag racing has come a long way in 30 years.

 

There isnt really much difference between D/R and ET streets, except DR are steel belted and ET are poly belts, there not wrinkle wall slicks and although you can presure them down to 20 or so they dont really grow too much, are you using VHT also? I dont see how you can launch a 3000+ car with 500+ hp and 450+ torque at 4500+ rpm and not spin off the line with those tires, there only 10.5 wide unless your sliding the clutch instead of dumping it.
Are you preloading your chasis before you launch?

 

There is a huge difference between my ET streets and My BFG Dr's....mainly sidewall. The DRs have virtually no sidewall, they are a 35 series tire. I take the clutch out right to the friction point where the car just barely starts to roll as the tree comes down and do a very quick slip/dump launch. It doesn't spin at all. Larry (gnxs) can attest to this.

BTW, my DRs are wider than 10.5 inches. It's a 295/35-18 BFG DR.

 

Actually it's 5.4 0-60 iirc, and go ahead and take your buddy with you on your 0-60mph 2nd gear test, you'll roast your clutch even more AND go slower with the added weight

 

I was more refering to the compound the tire is made of , yea a 295 would be appr 11.5 wide, I wasnt aware et's came in a 18" or are you talking about a 15 or 16 inch wheel?
second gear starts aside , Have you tried dropping the psi on the et's? And using VHT? And a set of air bags these are an inexpensive way to keep weight where you want it and improve your 60 and total et, if your not spinning I sure hope you have a driveshaft loop. going to a skinny front tire and removing the front shocks are pretty extreme but at a certian point the only thing you have left to work with is weight transfer, I guess A line lock wouldnt hurt either.


As far as testing my theory in my car its kind of pointless I dont have near the rwhp you guys do so its silly to think i could carry such a tall gear. Think of it this way though the z06 make 0-60 in like 3.6 seconds, making much less hp than you guys do, alot of that is because they do it with only one gear, a tall first and a 7k red line.



Hmm this one says 5.3, not too bad ..
Specifications
Engine
Type: V6
Displacement cu in (cc): 213 (3500)
Power bhp (kW) at RPM: 287(211) / 6200
Torque lb-ft (Nm) at RPM: 274(372) / 4800
Redline at RPM: 6600
Brakes & Tires
Brakes F/R: ABS, vented disc/vented disc
Tires F-R: 225/45 - 245/45 WR18
Exterior Dimensions & Weight
Length × Width × Height in: 169.4 × 71.5 × 51.9
Weight lb (kg): 3247 (1474)
Performance
Acceleration 0-62 mph s: 5.3 (source: Motor Trend)
Top Speed mph (km/h): n.a.
Fuel Economy EPA city/highway mpg (l/100 km): 20/26 (n.

 

My ET streets are 26x10.5x15 as I stated earlier. I have dropped the pressure on the ET streets, but below 13psi they don't seem to hook any better and the rear end starts to wander a lot in the second 1/8. The track is prepped with VHT.

My car is NOT a drag car. It's a street car that I take to the track a couple times a year. I'm really happy with how it gets out of the hole for what it is and I am not looking to do anything more agressive for an extra tenth on the 60'.

Oh and the whole 0-60 thing, if you calculate my 0-60 based on my 1/4 mile pass, it's around 3.1 seconds. Not too shabby with a shift involved.

 

While I can appreciate that you're trying to help, where did you get the impression that he wants to do anything so drastic as some of the things you posted to a daily driven 350z which sees the drag strip like twice a year...

 

WOW 3.1 seconds, thats enzo territory!! simply amazing, And i do agree with your desire not to change the car permantly for dragin it would ruin a perfectly good car , but still air bags are made just for that reason, and dont affect the cars performance in anyway when there deflated, , your wise to be cautious on the psi side personaly 15 is about as far as i will drop my tires, I worry too much about spinning the tire off the rim and having a serious accident at top end. I still think you should consider a drive shaft loop I hate to hear about you pogo-ing at 120+
Good luck and good racing, Matt.