We havent had a full day of rain in over a month and temps during the day averaging mid 90's for weeks straight, not to good for track days lol






DAN

Every time I want to go back out it's either like 100 degrees out or it's raining. I'll probably have to wait till September to get back out there. Wanted to go soon since I have summer tires on now instead of all seasons.

1) tyler20c ----50shot-- 10 Base Sport 6MT 13.171 @ 109.56 mph 2.110 60ft street


FORCED INDUCTION
1) SharpByCoop --GTM TT S2-- 08 G37S coupe 5AT 11.439 @ 125.68 mph 1.816 60ft DR
2) *Billy02987 --GTM TT S2-- 09 Tour Sport 6MT 11.736 @ 122.59 mph 1.942 60ft street - driven by jnaut
3) Nismo370 -----GTM TT S1-- 09 Nismo ---- 6MT 11.759 @ 127.14 mph 2.157 60ft street
4) Brazilbro ----GTM TT S1-- 09 Base Sport 6MT 11.812 @ 126.51 mph 2.020 60ft street
5) 98intrigue ---custom ST-- 10 40th ----- 6MT 11.852 @ 119.61 mph 1.880 60ft DR
6) Seb@SZ -------GTM TT S2-- 10 Base Sport 6MT 11.961 @ 122.13 mph 1.843 60ft DR
7) *RCZ --------Stillen SC-- 09 Tour Sport 6MT 12.207 @ 116.34 mph 2.034 60ft street - driven by jnaut

Wow, can't even get into the low 11s with FI.

What is the issue? Is it just traction?

No they are doing it to make you talk/type, see how good it's working.

In case you can't read the times posted above..

You can clearly see by their 60fts what kind of traction they were having. Compare the ET to the trap speed...If the trap speed looks too high for the given ET, you can probably assume it was traction related.

I know. ROCKET SCIENCE BRO.

There's a lot of ways it can be traction related, tires, suspension, wheel rate, antisquat, bad launch, bad track, bad prep, bad alignment.

I'd like more info, if it's not too difficult.

But yes, thank you for your extremely valuable post.

^I noticed you have been really worried about other members times at the track and you have not posted any yourself, is there a reason for that? Of course it is going to be traction related I had an isse getting traction at Byron with new AD08's and decent track prep, So I can only imagine double the HP with only adding some ET streets or DR's of some sort. Plus if you look at that tires they used over half of them say street tires.






DAN

I'm not sure what Nismo370 or Brazilbro did on their runs but I know for a fact that jnaut had some issues with Billy's Z.

First problem was traction off the line and shifting into 2nd gear. We all know how critical those first few seconds are when making a pass.

Second issue was at the end of the 1/4 mile. With the stock 6MT 370Z gearing, 4th gear reaches redline around 126 mph or so. If that's wrong, someone please correct me. IIRC, jnaut tried a few runs holding 4th gear and one or two runs shifting into 5th. But I have destroyed too many brain cells since then remember which produced a better ET/MPH. :confused: :shakes head: :(

Hopefully this sheds some light on the discussion.

I know that RCZ's car and Billy's car both had coilovers with aggressive alignment settings (rear camber).

IIRC, 98intrigue had coilovers too, if not lowering springs, but definitely not stock suspension.

The rest I do not know personally so I can't comment on their setups.

He has been banned tranceformer, I was really wanting to hear his response since he was trolling lol




DAN

Yeah that guy was trolling all over the place just :stirthepot:

Damn that was quick!

Nah he's been trolling other threads for like almost a week now.

Today he was just real bored.

You need to get your azz to a drag strip soon! Come down to MD and I'll go with you :tup:

Also low 9's aren't happening until you do a whole bunch more stuff to your car.

Low 9's would be stripped interior, built motor making about 900-1100whp, with the biggest set of slick tires you can put on a Z and the best track prep you could imagine. I only say this because there is a local 350z that ran 9.35 and was making 1200whp when it happened lol.






DAN

I am not that dumb... lol

That was the troll MU that said the 9's BS.

:tup:

Subd

sent from my SAMSUNG- SINGLE TURBO SGH-1717

Not happy at all with my results:

Year: 2009
Model: Touring 370Z
Options: Sports Package
Transmission: 7AT
Tires: 275/35 Front 305/30 Rear Michelin PS2 (F 33 PSI, R 18 PSI)
Boltons: Uprev, Art Pipes, F.I 18" Exhaust, Stillen G3, NST pulleys, 25R Z1 Oil Cooler.
Suspension: Tein's S-tech Springs, Stillen Sway Bars
Track Name: Autodromo Mobil1, Santo Domingo, Dominican Republic
Track Temperature: 92 degrees F, Elevation 20Ft

This was my first time at the drag strip with the 370Z, but I have been many times with other cars, side stepped the brake and launched at around 1.5k Rpm, anything above that would just get me massive spin, even like this it was spinning all the way to 3rd gear, disconnected front sway bar, but nothing helped my 60', had another run with a 104.26 trap speed, but ran a worse time 14.1, thought I should've been going faster for my mods.
http://i50.tinypic.com/24cb690.jpg

Well track prep is a huge factor and if it is 92 deg out you shouldnt be expecting to break records lol.





DAN

I applaud you for racing in the heat, it can be frustrating. On the brightside, the tracks down here are usually empty during summer, I can get plenty of seat time (usually around 15 runs for the night).

Racing in the heat is the only way here, temps are usually in the mid 80's, but summer time is always 90+F, best you would get is low 80's at night time. I'm looking for answers on how to improve my 60' times (2.241), also my 330' time (6.027) is way off, traction issues are stepping me back. 1-2 shift equals big spun of tires, do you think shifting earlier than redline might help?


Some Pics at the track:
http://www.the370z.com/members/370zd...ure53373-a.jpg
http://www.the370z.com/members/370zd...ure53369-a.jpg

Better tires might be your only hope.

That's my plan want a extreme performance street tire that would be good for the street and the occasional drag strip and road course, still not sure what to get for the rear tires, what you guys think would be better for the drag strip?

Bridgestone RE-11's 285/35/19 or 305/30/19
Hankook Ventus R-S3 275/35/19 or 305/30/19

I would think the wider the tire you can fit on there, the better grip you should be able to get. I think longer of those would be ok. From a drag racing point of view, maybe go with the 305's that are lighter in weight. I'm no expert though, just basing this on what I've read and experienced from draw racing myself.

Car is lowered, so that hurts your traction because of the increase in negative camber. Stiffer springs and lower center of gravity also kill weight transfer. 18 psi is waaaay too low for street tires at the strip. My 60' times get worse if I go below 29 psi, plus it kills your MPH at the big end. Wide tires with a small stiff sidewall do not increase straight line traction. tall tires with a huge soft sidewall do. I've heard disconnecting the front sway does nothing for increasing traction ( besides lower weight when removed ) on an independent rear susension car because we load the rear tires evenly. The diferential is mounted to the chassis and is not suspended by the springs like a live axle car.

RE-11's 285/35 for the track 305/30 for looks :yum:

I lowered the car and corrected my camber setting with SPC Arms, running (-1.5) rear camber, witch is on the positive side of factory settings (-1.2 to -2.2). As for the springs Tein's are comparable to Nismo spring rates, tough they are progressive not linear and the car sits lower, but should be pretty much similar in getting of the line weight transferring, here's a comparison :

OEM Spring Rates
F: (7.5 kgf/mm) R: (8.1 kgf/mm)
Stock Nismo rates
F: (8.6 kgf/mm) R-(9.3 kgf/mm)
Tein S-tech
F: 8.5kg (-0.9") R 9.4kg (-0.7")

I will try running higher psi when I go back to the track, but this will be after getting new tires, as you say, small stiff sidewalls do not help in straight line, this is the reason why I'm leaning on the RE-11's 285/35 or R-S3 275/35, still undecided, every street tire class is now dominated by RS3's, if these were to come in 285/35 they'd be my choice, the only reason why i haven't decided.

Not sure If disconnecting the front bar is helping or not at the moment, but most of the guys running big hp rwd cars do so to help their 60', have always read "The front sway bar’s job is to transfer weight from the left front to the right front. By disconnecting the sway bar (or better yet, remove it to also eliminate weight), the front end is now able to transfer more weight to the rear tires"; I'll try to do a couple of runs with and without and see if it's helping or not.

thanks for your advices :driving:

We have pretty good luck with Nitto NT05 tires on our high horsepower (600 plus to the tire) Challengers. They still blow off at the strip so I use slicks, but it might work well in the 370.

And if you are going to set it up for drag, try to get rear camber as close to 0 as you can.

What tire size you run with the Nitto's?

Yes, will do. Getting the most out of the tires contact patch will help a lot.

I have 20" wheels so either a 275/40R20 or a 315/35R20 I believe.

Every car and track is different, you kinda have to figure it out by trial & error. Of course is helps to get tips on what to try out but in the end it is up to the driver.

What were most of the other cars running that day? If the majority of the other drivers/cars there were struggling to run decent 60ft times, it usually means that the track prep was pretty sh*tty that day.

In your case, shortshifting 2nd gear may help. Other than that I'm not sure what would help because I've never driven/raced a 7AT 370Z. Maybe the others here can help you out.



I highly recommend RE-11's.. IMO you're better off with the 285's

Werd. I've got mine set to about -0.6 degrees of camber in the rears. Although with the the RE-11's and the upgraded tires, it actually became more difficult to launch the car (w/o bogging). It almost felt like I had too much traction and the only way to remedy that is to let out the clutch harder and/or launch at a higher RPM. It makes me feel uneasy when you can launch at 4000 RPM then all of the sudden [after the mods] you have to go up to 4500 RPM to avoid bogging at the launch.

305 35 18 MT drag radials . set at 15 lbs .
On volk t-37's 18 x10.5 +12.

Talked to GTM last night ,he will be shipping the stage 4 tranney with custom VB next thursday to me, I also have a new 3400 pro torque converter to install.
12.?? soon.

Z

Nice, i'm out of the loop but did you put your SC plans on hold?

the build will start right after i do a day or two of racing N/A. i want to beat J nauts time all moter.
also did not want to run the SC on the car till i got the built tranney.

Well I went to the track for the first time last night. I was pretty impressed first run was my best with a 13.69. I was going to be happy just being in the 13s. My friend was saying I would be lucky in the 14s being my first time. He was pretty pissed how quick I ran. Ive got a lot to improve. Ill post up my slips in a bit. I did beat on a WRX pretty good so that made me happy.

might go to Lebanone Valley Drags tomorrow
 

Last year my 350z was completely flooded(total loss). I decided to buy my car back from the ins. comp. & re-wire it. After many changes/much work(not by me:), I'll see tomorrow if it's race worthy, if it doesn't break down:)

I'll be running my street conti tires & of course it has no tune. I'll be happy if I get a few runs in & am able to drive home. As far as times???? With those tires I'll pop the clutch a bit above idle:) & see if I can break 13.5 @ 105.

I'll post results late Sat. Weather should be nice.