Quarter Mile List, 3rd Edition (Page 3/5)
Will JUL 26, 11:27 AM
And it S.U.C.K.S. to break an axle that far from home.

Here's some wheel hop + traction compound + trying for a 1.7x sixty time


quote
The Dark Side of Will








The track prep was very good. One of the first guys I talked to before I made my first run said that traction was good.

There were only a couple of other street cars there... Two Hondas running in the 10.2 range. I was the fastest real street car there, although a couple of the obviously dedicated drag cars that showed up on trailers had plates. I think the fastest time I saw on the board was 5.0xx, but I only watched a fraction of the passes that evening.

I was working on both my launch technique and my clean-off spin technique. I overdid the clean off spins and had some minor wheel hop. That may have contributed to the CV spline failure. I had the clean off spin perfected for the 4th pass..., just the right RPM and clutch slip to get 1-2 full revolutions of the tires with no wheel hop.

By the time I made my 4th run, both tires and pavement were nice and sticky. I was getting used to the clutch and felt that I had the RPM and slip figured out to cut at least a 1.8 short time if not a 1.7. Obviously, there were other circumstances of which I was not aware. If I'd done the 1.7, I definitely would have gotten a 7.9.

[This message has been edited by Will (edited 07-26-2020).]

pmbrunelle AUG 01, 09:59 PM
I went to Icar at the Mirabel Airport today. It was a hot day, 28 °C at race hour!

Overall, it's about where I expected to be.

I'm in the "PONT" in the right lane.


The 60' time was not much better than the 2.106 60' best time I did with a stock 2.8 Fiero...

Launching at 3k RPM resulted in massive wheelspin, so I launched at about 2k instead. Still, I had to modulate the throttle through all of 1st gear; not enough traction to really floor the gas pedal in 1st.

I didn't try launching off idle; down that low, the turbo is completely dead.

Honest Don: if you create a 1/8 mile list, I'll submit my entry to your list.

[This message has been edited by pmbrunelle (edited 08-01-2020).]

Honest Don AUG 06, 04:12 PM

quote
Originally posted by pmbrunelle:

I went to Icar at the Mirabel Airport today. It was a hot day, 28 °C at race hour!

Overall, it's about where I expected to be.


Launching at 3k RPM resulted in massive wheelspin, so I launched at about 2k instead. Still, I had to modulate the throttle through all of 1st gear; not enough traction to really floor the gas pedal in 1st.

I didn't try launching off idle; down that low, the turbo is completely dead.

Honest Don: if you create a 1/8 mile list, I'll submit my entry to your list.




What are you using for tires? I’m not sure I’m the best choice for maintaining a list; my online presence is somewhat irregular.

pmbrunelle AUG 06, 06:58 PM
I presently have 215/60R14 BFGoodrich Radial T/A tires at all four corners on stock wheels.

It is in the plans to get bigger more fancy wheels/tires for the car. This will have a similar effect as a slightly taller final drive.

On the street the car hooks OK, considering that I usually launch off-idle. Also most road surfaces stick better than the rubberized surface of the dragstrip.

Of course, my impressions regarding traction may change when I crank up the boost.

********************************************************************************

I wasn't interested enough to run a 1/8 mile list myself; I was just saying that if you really wanted to, I'd submit my timeslip as a contribution to your list.

[This message has been edited by pmbrunelle (edited 08-06-2020).]

Honest Don OCT 31, 12:41 AM



Not a 1/4 but I may as well post for posterity. Left lane.


87 SE. 2.8/TH125c.

Stock crank, stock rods, stock pistons, turbo, stock block, stock heads, stock cam, stock converter, lotsa stock stuff.

[This message has been edited by Honest Don (edited 10-31-2020).]

pmbrunelle OCT 31, 09:12 AM
I decided to converted your time/mph with this Wallace Racing converter:
http://www.wallaceracing.com/et-conversion.php

Screenshot:


I inserted it into the list.
Since this is an estimated time, and not a verified time per the current requirements, it is indicated as a white "B-grade" run.

How much boost pressure?

[This message has been edited by pmbrunelle (edited 10-31-2020).]

Honest Don OCT 31, 10:14 AM

quote
Originally posted by pmbrunelle:

I decided to converted your time/mph with this Wallace Racing converter:
http://www.wallaceracing.com/et-conversion.php


I inserted it into the list.
Since this is an estimated time, and not a verified time per the current requirements, it is indicated as a white "B-grade" run.

How much boost pressure?




Thanks! Comparing to slips with similar numbers, I think the wallace calc errs on the side of caution but hey, I'll take it.

As for pressure, I think around 14-15? I haven't looked at the logs yet.


[This message has been edited by Honest Don (edited 10-31-2020).]

pmbrunelle OCT 31, 10:44 AM

quote
Originally posted by Honest Don:
I think the wallace calc errs on the side of caution



I just fed your estimated 1/4 mile stats into the inverse operation pane:


The original mph was exactly recovered. This leads me to believe that Wallace uses unbiased conversion functions for the trap speed.

However, the original ET was not recovered. This suggests a pessimistic conversion function, for at least one of the directions.
Honest Don OCT 31, 04:07 PM
Looks like a 13.75 gets it there using the inverse


Honest Don NOV 06, 12:45 AM

quote
Originally posted by pmbrunelle:


How much boost pressure?




Log says 16. The tach spikes are a new occurrence; even set off the rev limiter. I guess it’s something to work out over winter.

[This message has been edited by Honest Don (edited 11-06-2020).]