Trap speed question - Page 2 - ZR-1 Net Registry Forums

9T1 Red ZR1 · 11-20-2015

It was in the 70's but you had to sit in line waiting for 10 to 15 minutes between runs. I shut the car off but I probably should have opened the hood to let some heat out.

Thanks,
Bill

9T1 Red ZR1 · 11-20-2015

It was a strange situation. It rained that morning, so they had all of the drivers drive up and down the track at around 30 mph for about 20 to 30 minutes to dry the track off. The car was at full operating temperature when the racing began.

Paul Workman · 11-20-2015

Seems a little slow to me as well; perhaps partially for reasons mentioned. It is hard to relate to the unusual race criteria, but for sure you shouldn't be shifting into 4th at 115 or 118 mph with a stock 3.45 differential. If, as you say, you are shifting into 4th, then you're short-shifting by a bunch! I'd suggest you run it out in 3rd, AND consider installing a shift light (far more accurate and you don't take you eyes off the road/track).

From Mark Haibeck's web pages:

For a rough comparison, my stock best run from a dig in the quarter mile (1320 feet) trapped at 113mph. So, with an extra 80 feet, AND a 55 mph roll-on, well...yeah: I'd agree that something isn't right. But, let me be clear: Is the 1400 feet including the roll-on distance, or is it 1400 feet after the 55 mph mark?

In short, Heat, tach calibration, and the snorkel collapsing are all things I've experienced having a negative effect on trap speeds.

9T1 Red ZR1 · 11-20-2015

You are correct, the 1400 feet is the length of the race after the start. Is there a link to connecting a shift light? I've never checked the tach calibration, but as you say, it would be nice to not have to look at it.

Thanks,
Bill

Paul Workman · 11-20-2015

Quote:

Originally Posted by 9T1 Red ZR1

You are correct, the 1400 feet is the length of the race after the start. Is there a link to connecting a shift light? I've never checked the tach calibration, but as you say, it would be nice to not have to look at it.

Thanks,
Bill

Here's a link to a thread on shift lights. Personally, I like the mini-Raptor light that can be hidden behind the AC grill. It is out of site except when it is lit. Then there is NO trouble seeing it, even w/o taking you eyes off the road.

Do you have an FSM?

9T1 Red ZR1 · 11-20-2015

Thanks for the link. I do have the FSM. That is a great idea to install the light there. Thanks for your help, that is why this site is the best!

Bill

A26B · 11-20-2015

This may help.

9T1 Red ZR1 · 11-20-2015

Thank you Jerry, that is a big help!

Bill

11-20-2015	#11
9T1 Red ZR1 Join Date: Jun 2013 Location: Warminster, PA Posts: 78	Re: Trap speed question It was in the 70's but you had to sit in line waiting for 10 to 15 minutes between runs. I shut the car off but I probably should have opened the hood to let some heat out. Thanks, Bill __________________ LT5 Red/Red

11-20-2015	#12
9T1 Red ZR1 Join Date: Jun 2013 Location: Warminster, PA Posts: 78	Re: Trap speed question It was a strange situation. It rained that morning, so they had all of the drivers drive up and down the track at around 30 mph for about 20 to 30 minutes to dry the track off. The car was at full operating temperature when the racing began. __________________ LT5 Red/Red

11-20-2015	#13
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Trap speed question Seems a little slow to me as well; perhaps partially for reasons mentioned. It is hard to relate to the unusual race criteria, but for sure you shouldn't be shifting into 4th at 115 or 118 mph with a stock 3.45 differential. If, as you say, you are shifting into 4th, then you're short-shifting by a bunch! I'd suggest you run it out in 3rd, AND consider installing a shift light (far more accurate and you don't take you eyes off the road/track). From Mark Haibeck's web pages: For a rough comparison, my stock best run *from a dig* in the quarter mile (1320 feet) trapped at 113mph. So, with an extra 80 feet, AND a 55 mph roll-on, well...yeah: I'd agree that something isn't right. But, let me be clear: Is the 1400 feet including the roll-on distance, or is it 1400 feet after the 55 mph mark? In short, *Heat, tach calibration, and the snorkel collapsing* are all things I've experienced having a negative effect on trap speeds. __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry Last edited by Paul Workman; 11-20-2015 at 07:43 AM.

11-20-2015	#14
9T1 Red ZR1 Join Date: Jun 2013 Location: Warminster, PA Posts: 78	Re: Trap speed question You are correct, the 1400 feet is the length of the race after the start. Is there a link to connecting a shift light? I've never checked the tach calibration, but as you say, it would be nice to not have to look at it. Thanks, Bill __________________ LT5 Red/Red

11-20-2015	#16
9T1 Red ZR1 Join Date: Jun 2013 Location: Warminster, PA Posts: 78	Re: Trap speed question Thanks for the link. I do have the FSM. That is a great idea to install the light there. Thanks for your help, that is why this site is the best! Bill __________________ LT5 Red/Red

11-20-2015	#17
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,394	Re: Trap speed question This may help. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

11-20-2015	#18
9T1 Red ZR1 Join Date: Jun 2013 Location: Warminster, PA Posts: 78	Re: Trap speed question Thank you Jerry, that is a big help! Bill __________________ LT5 Red/Red