Speedy32

took my 17 Z07 to the strip last night and questioning my results. All stock 91 oct with Boostane.
Track in Penwell TX with a DA of 5400 last night!!
Do have reproductions 19's with NitoR5 on back with 24 lbs. Hooked Great!
Ran in Tour, Race, and Track with similar results.
Tour = 60'-1.7506 1/8-7.4030 1/4-11.4276 MPH-122.35
Race = 60'-1.7624 1/8-7.4270 1/4-11.4554 MPH-122.32
Track = 60'-1.8006 1/8-7.4521 1/4-11.4811 MPH-122.35


I thought my 60' was fair but the big end just did not seem to good. How do these #'s look?
Im not an expert on DA, realize 5400 is High, how much do you think this impacted my runs?


Thanks

cvp33

Tough DA. My 2012 CTS-V coupe with -400 DA ran an 11.52@121mph on drag radials. If you can get that 60' in the 1.5X range you could see an 11.0X.

GeorgeR_Zed06

I feel your same pain with this horrible DA in our region. I race over here in Hobbs, NM but whenever I get to go, the DA is between 6500' - 7200'. Your track times are average out here with this bad air which imo is pretty good. if you went to Ennis, TX, you would be running high 10's.

Is your car a Manual or A8? That right there can mean the diff between an 11.4 or 11.1 ish....

23/C8Z

go to drag times DA calculator and punch it in. my guess is 3 or 4mph and .4 et

383vett

Op must have an A8 with those consistent times. I agree with above, with a good da, the car should be high 10's.

davepl

Yup, not exactly optimal DA, but I'm surprised you say it hooked really well with your 60 foots as high as 1.80... looks like there's lots of room for improvement in the ET there!

Reminds me that I used to have a V12 Twin Turbo CL65 which made good power but was rear wheel drive without posi. So it'd run 11.6 on a 2.1 sixty foot!

Speedy32

Yes, Have an A8.
each run I performed the same. foot off brake and punch throttle. wanted to see difference between modes and Touring won out.
Next time out Ill play around with loading RPM's or something to improve 60'.


Thanks!!

383vett

I've gotten better 60s loading the converter.

ajrothm

That DA killed you... That's 3-4 mph MINIMUM... And likely .2-.3 in ET.

Don't worry about the car.....worry about getting it on a better track.

These cars will run 10.90s completely stock in average air....(+1500' DA or better)...And many have ran much quicker. Mine went a 10.84 in +400' DA.

Mr. Gizmo

GeorgeR_Zed06

Yes, try loading up the converter. Doing so also takes the flash time out and at the same time allows you to pre-load the chassis. Then you are able to shoot off the line like a sling shot instead of like a stick car.

All modes you raced in still retain some sort of the active handling except for track mode. I've always had better luck just holding the trac control button down for 10 secs and disabling all systems.

ajrothm

You see the DA he ran in right? That's 50+HP he is down...

Not to mention we don't know how well he cooled the car down, what the race weight was etc...

Speedy32

Each run was roughly 50 minutes apart. outside temp 77 and hood up between runs. Gauge reading was 200 by the time I got through staging. Not sure how accurate that gauge is??
Im sure my reproduction wheels and nittos added weight. me 200lbs, and unfortunately gas tank was full...I don't get it out much.


DA does seem to be the killer here. My contract here in W Texas will be up by EOY and hopefully I will get transferred to some better air. For now I'll just keep having fun and testing some better launches.

Speedy32

Next time you plan a trip to the Hobbs track shoot me a message. Maybe I can plan it too. Drive from Midland not so bad.


Mark

GeorgeR_Zed06

Unless something comes up, I plan on being there April 7th, which is there next TNT.

Mike Jesse

Easy10.80's at the track I run at. Usually 800 ft. or less.

Try it without the Boostane and see if it doesn't pick up.

At my home track, my car will not tolerate loading the converter up at all. Just blows the tires off.
Leave at a dead idle is rewarded with a 1.65 or less 60 ft. Track setting.
25 PSIG.

I've never tried launching the car in one of the other modes.

VetterFlyer

I live at 5,000 ft and regularly see Density Altitude’s of 6500 to 8,000 ft. Our supercharged engines have rated HP at Sea Level and loose HP with altitude vs Turbos that don’t. My calculations are that each 1,000 ft equals 1 in. of Mercury, so using Standard SL pressure of 30 in hg (29.92 for purists) divided into 5= 1.67 X 650 SL HP =108 HP loss. 6,000 ft =130 HP loss, and 7,000 ft= 151 HP loss.
I put on a small upper pulley to try and gain back some of my loss. Soon we will have Turbos that hold rated power with increasing altitude. I hope!
JH

GeorgeR_Zed06

I have heard that in our high altitude, we can get away with a little more timing than sea level areas. So, retarding the fuel too much can actually hurt a car performance wise especially if the ECM on these cars already retards to compensate....

nist7

Indeed.

I always feel kinda bad for people who live in higher altitude cities...basically getting less HP than what they paid for the car

IIRC, the rough rule is that every 300ft = 1% power loss. At 6000 ft (for ease of calculation) you're losing about 130hp from a 650hp Z06.... (just as you calculated as well)