Went to the track tonight. I felt i could hit 14.6 but didn't.



3 of my better runs. I'm trapping 96mph.

- i'm AWD sedan.
-removed most extra weight i could w/o going extreme.
18x8.5 235/45 and 265/40 brand new sumotomo HRZ3 tires. I came in at 30PSI, ran at 25, 40 and 20 PSI.
- no tire spin at launch, some at the 1~> 2 shift
- main bolt-on are HFC and 5/16 motordyne. but have z tube, rev up air box, coilovers set on FIRM
- VDC off, manual mode.


My worst 60' was 2.3 and slowest run was a 15.06, everything was hanging around 14.8-14.9, i know shifted a little early and late on some of them.

I feel its bogging down at the launch. But i dont know much about drag racing.

 

And,you are driving...?

 

Get a tune? Those are some pretty low traps.

Also try regular auto mode because I can tell your shifting is all over the map.

 

One thing i noticed with the regular auto was in 1st it would shift really early. Almost 900-1200rpm before redline. I'm TRYING to do it at 750 before, since the auto is a little slow. I know to hold 3rd down till i pass the line.

I only went out for fun, all my buddies ran sub 13.5 in their v8'. But obviously i want to get a little better, if the mags can get a 14.8 out of a STOCK car, i should be able to trim down the time with 2 proven HP mods (HFC and 5/16 spacer)

I know i need more seat time but what am i doing wrong or not doing. They are planning to go at the end of the season.


oh and the DA at the time was around the 500-600 mark

 

tune makes a GIANT difference .. you cant add breather mods to a VQ w out it ....pointless.. i wish it werent so, been there, so have million of others.. same story.

You need a tune and ( test pipes really) to make any power, let alone most likely LOSE power at anyplace other than the very top end of the rpm range..

look into it, osiris it up, and you wil ahve a completely different car under you.. totally different.

 

Thanks for the time slips.

The car is picking up 20.3 MPH in the second 660 feet. The car is running OK.

2.2 second 60 foot time is no shame. Not great but OK.

Big area for improvement: 1/8 mile time is 9.5 seconds. That is generally the result of a sloppy first to second gear shift. Get that shift right and you will see a considerable improvement in 1/4 mile ET.

 

So i need to focus more on the 1/8 time, which is the 1~> 2nd shift mainly, what can it down to? Its very hard to screw up the 2~> 3 shift LOL. So its either my launch or the 1~>2 shift.

I dont know much about this sport, i'm just looking to run some respectable times. Maybe i'll have time to get a tune in before i head out.

2.2 60 foot is not a bad time for a RWD/FWD. But i tons have told me 2.0 is more of a street tire AWD range.

 

I am at a bit of a disadvantage offering advise because you drive a automatic transmission. You must hit first to second gear hard and keep the throttle to the floor. If you have traction good. If the front of the car points the wrong way back-off for safety of course.

 

after the launch, the pedal is FLAT OUT till the end.

i think i heard the tires break traction once out of the 10 runs i did. So its not a big deal. I know there is a delay from when i shift and when the car does, i know i bounced off the rev limiter a couple of times.

But the time i thought i did the best shifts, i ran a 15

The AT when left in full auto, it short shifts in 1st.


Also from my understanding, on a stock tune, when i'm WOT its actually only 95% open VS when i'm tuned WOT is now 100%, is that correct? Obviously that would be a good gain there.

 

What's your launch method?

 

Wtf are you driving?

 

Ah.. sorry i copied and pasted this from the other board, Z guys seem to be more knowledgeable on racing VS the G board.

I have a 05 G35 sedan AWD. Only comes in auto trans and has the normal DE motor.


Small brake torque around 2200-2500RPM. I'm not spinning tires but i fear my AWD system isn't going to like it.

 

The rest of your time might just be in the launch.

 

Try off idle or around 1000-1500rpm. Rear tires between 25-28psi. Actually you can practice your launch in a parking lot.

Pick a point 60-100ft away and have someone time you with a stopwatch trying different RPMs.

Shift in MM @6400 or 6500. Since your rev limit is not raised from a tune. If your hitting the rev limit try shifting 100 rpm sooner.

I shift at 7k, but I have a shift kit so there is hardly any delay. Check out my vids on YouTube denchan36.

 

thanks. Yea i'm thinking that rev limit is what is holding me down a bit.

Im trying to figure out if i can buy the tuner version and be able to learn this myslef.

 

Also put your rear coilovers on a softer setting since a X will not be 50/50 unless in snow mode.

So most likely at the track you are 10/90 or 20/80 meaning most your power is going to the rear wheels.

The car won't plant the wheels on the firmest setting.

Try it out in the parking lot.

 

If it makes you feel better the DA if you ran at Byron was 2450ft above sea level on 5/23

If you ran at a sea level track you would of went 14.3@98. The car will be faster along with other things when it gets cooler out.

Just get some practice launching and shifting to find the cars sweet spot.

 

I'm no drag king, but based on your comment above, I'd suggest:

1) Get the Osiris tuner version
2) Change to the Uprev Throttle programming
3) Bump your RPM limit a bit
4) Log tune your car using this thread to get your car running right: https://my350z.com/forum/tuning/5188...ing-101-a.html
5) Have an Uprev Pro Tuner tweak your timing on the dyne for max powah
6) Video your runs so some of the drag guys can give you specific advise

 

I ran at 500-600ft above sealevel. I did it at Greatlakesdrag in WI. They are open during the weeknights and most importantly they are open at night. Byron closes at 5pm.




Man ive been reading all the stuff you have been posting in that 101 thread. Slowly picking up and having a understanding. My two local Uprev tuners according the their site are GRD and AMS, GRD seems to have pulled all the Uprev stuff off their site. They many do audi and euro cars now. AMS has them listed but they are the world famous EVO tuning guys. Not big on VQ.

Both of them dont reply to emails and are pretty below average on phone calls.


By #2, you mean that 100% throttle % right, VS the 85% stock programming? Is that easy to adjust. I saw the +2 timing part. Aside from me no hitting the rev limiter when put at 7200, is there any gains? Will i make more power between 6700-7200. Or is this mainly not to bounce off the rev limiter, i thought power drops after 6500 on stock cams.

 

It's a single button you click. Also, it isn't just the 100% vs 85% at WOT, but it changes the response through the entire throttle curve (even more noticeable in everyday driving and road/autox driving).

mainly to not bounce off of rev limiter and have the fuel/engine cut come into play - because that will DEF hurt your times. On most stock DE w/ breather mods that I've seen tuned, torque falls off up high, so you hit a level of diminishing returns and you'll want to shift unless you're at the end of your run. I'd guess that a dyno chart for your car would a good place to start for determining when your optimum RPM ranges are for shifting - but again, some of the guys with real drag experience in our cars would know much better than me.