Organized Drag Racing and AutocrossDrag racing and autocross discussions and questions. Techniques, tips, suggestions, and "what will I run?" questions.
Welcome to ThirdGen.org!
Welcome to ThirdGen.org.
You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!
These will be the final passes for the rusty IROC-Z. It'll come apart this season and the go fast parts (in addition to several others) will find their way to the Sport Coupe.
For the record, this is my daily driver ( which just recently pulled a u-haul 7 000 kms cross country ). 100 000 kms on the original bore and crank. Drove to the track ( 2 1/2 hours) with the treaded bias ply McCrearys and raced.
Nice cool day.
1) 12.856 @ 104.22 w/1.735 60'
2) 12.800 @ 104.12 w/1.706 60'
3) 12.778 @ 105.05 w/1.754 60'
Pretty consistant as always. No tuning although I know there are a couple mph still to be had.
I expect the new car to go 12.5's or better.
__________________ 1986 Sport Coupe, underside & engine bay sandblasted/painted, 353 Gen 1 SBC, Vortec heads, XR276HR Comp cam, 1.6 Comp Pro Mag rockers, Full MSD Ignition, 700R4 w/ usual upgrades, 10" TCI convertor,3" driveshaft w/ 1350 u-joints, Dana 44 w/3.73 posi. All new suspension, LS1 front brakes, 1LE rear brakes, Del-A-Lum bushings, UMI adjustable torque arm, Intrax 2" drop springs. Best time on old chassis(86IROC,3700lbs)12.77@105/8.09@84(1/8th)w/1.70 60'. New chassis...12.74 @ 108. (Same weight)
86 TA 502. Work in progress. 86 IROC-Z. Winter beater.
I had a similar experience with the '57 this past weekend. Density altitude was only 600' above our elevation, according to my weather station. Ran a best NA at altitude of 12.839 @ 103.75 MPH on the first TT pass. The temp started warming up after that so DA went up, and the car slowed down accordingly.
That was probably the last pass the 396 will ever make (at least in this car). Stroked LQ4/4L80E being readied for it.
Here's a question for you five7.
While I didn't have a weather station with me at the track I did a little calculation with the info I gathered up the next day.
Air temp 43F.
Realtive humidity 45%
Barometric pressure 102kpa (about 30" Hg)
Track elevation 570'
I end up with a density altitude of minus 370'(+/-)
Does that compute?
__________________ 1986 Sport Coupe, underside & engine bay sandblasted/painted, 353 Gen 1 SBC, Vortec heads, XR276HR Comp cam, 1.6 Comp Pro Mag rockers, Full MSD Ignition, 700R4 w/ usual upgrades, 10" TCI convertor,3" driveshaft w/ 1350 u-joints, Dana 44 w/3.73 posi. All new suspension, LS1 front brakes, 1LE rear brakes, Del-A-Lum bushings, UMI adjustable torque arm, Intrax 2" drop springs. Best time on old chassis(86IROC,3700lbs)12.77@105/8.09@84(1/8th)w/1.70 60'. New chassis...12.74 @ 108. (Same weight)
86 TA 502. Work in progress. 86 IROC-Z. Winter beater.
