Going back to the track tomorrow to see if I can claim that 13.9 with stock power & torque :)

Weather warmed up finally, it's going to be a rental day so full prep to the nines. Will report back with my micro record lol..

After many burnouts & launches yesterday we got it fam :burnrubber:


https://i.imgur.com/JOSx7GU.jpg

^very nice. Have you weighed your car?

Thanks man. I haven't had it on a scale yet no.

Off of memory 150-160lbs is out between what I have done so far. I will probably get it on some truck scales in the spring just to know. I will be removing more weight over the winter where ever I can without hacking or looking way out of place.

You're driving the shit out of it. It seems like 0-60 and quarter mile are difficult with these cars because of launch consistency.

Honestly I am :lol: I said just last weekend after 11 hard passes how impressed I was with how the car did all season. I couldn't of beat it any harder this past track day. Full burnouts, 7000-7200 launches & power shifting every gear at 7200.

It was a rental day so they prepped the track real well this past Saturday. I was hooking 1.9 sixty foots all day dumping the clutch from 7000-7200 with no spin at all. Problem was it was dragging the rpms so far down (3800-4000 ish) It was touching all of that torque dip through the curve. I must have done 5-10 14.0 passes that way. I ended up going from my standard 18 psi to 21 just to get a little tire speed. The sixty foot went from a 1.94 to a 2.0 but my 330 foot was better while the rpm was staying above 4800 rpms after I let the clutch out. Once I actually gain some power, torque & put a higher FDR I shouldn't have the bogging issues on the drag radial or future slick set up. These current NT555R's are slightly taller out back so I lost a bit of gearing that way as well but the stock Eight six still pulled them down the track.

I haven't put the stock tires back on since I switched after the second race of the season to the drag radials. I did go low 14's (14.3s) modulating the throttle through first but as soon as I power shift second it will spin again slightly and again a tad in 3rd. They are old oem tires but they just don't have it obvi.. Even on the 555R's you can hear the tires every gear down the track.


I never thought I would do a full drag series this year with the car but it did well & I will probably aim for the fastest NA Eight Six 1/4 time next season because why not :word:

You should be launching at peak Torque roughly 4600-4800rpm. Lower RPM if you are getting too much wheel spin. At 7200 rpm you are at the lowest amount of torque same amount as the dip at 4k.

Optimal shift points for maximum acceleration you would need to calculate mechanical torque to the wheels to figure out when it is best time to shift, typically but not always this is right before banging off rev limiter.

You can find a stock dyno graph and input the data into here with the MT gear ratios to figure out exactly when you should be shifting.

https://glennmessersmith.com/shiftpt.html

Not with drag radials

I know you have torque, torque, & torque on your mind lol.. but The car would never run even close to the same ET number lunching at 4-4500 rpms. Besides torque I will take hp, rpm & gearing all day every day. You also have to look at how much hp the car is making at 4000 rpms which is not a whole lot in comparison to 6000-7200 rpms. You also have to remember the rpms drop when you let the clutch out especially if you are hooking hard with a proper tire. If I launched at 4k it would drop down to around 2500 rpm or worse.. When you are in it to win it you launch at peak power / rpm, power shift wide open throttle, and go through the traps on the north side of the rpm so you are not touching the weak side of the power band (No matter the application)

Even currently leaving at 7000rpms full hook the rpms drag down enough as it is.

I will give up torque for high rpm power any day as an example. You can gear the car accordingly to the power combo. My modular Ford All motor combos were similar with smaller cubic inch motors you are looking for the top end charge. You won't see big torque out of small cubic inch motors unless you have a power adder or a slight bump in torque with a stroker set up.

4k-4500 rpm (lowest torque) is a big difference from 46-4800 rpm (peak torque) not sure why you referenced 4k rpm 3 times when I specifically said peak torque, not lowest torque, 4k would be the opposite of what I said.

Your RPM drops once your wheels hookup and rpm matches wheel speed. Such a high drop is because lack of torque at 7-7200rpm and 7-7200rpm translates to roughly 35mph wheel speed in 1st which you are obviously not doing even 1 second off the line. So once tires hookup engine has no power and rpm drop dramatically when launching at 7-7200rpm. 4600-4800rpm is peak torque that is what will get you moving off the the line the quickest. That is where you have the most power to keep from bogging down and keep RPM from dropping so much. Fastest way to launch assuming grip is not a limiting factor is to launch at peak torque.

Not really sure what the rest of your post has to do with anything. But short shifting at 7200rpm probably is not optimal. But i haven’t taken the time to calculate it. You can input your data into website i linked to verify.

You are a more on paper type of guy and I am real world. Every proven all motor drag car is launching past peak torque by a good margin. I’m not saying you’re wrong but neither am I.

Until one goes out and tests hundreds of passes at multiple rpm launches does one know the best outcome. Put over 100 runs down this season just sayin

From your posts it seems you have launched from 4k and below or 6k+ ?

I am saying launch at 4800 and see what happens. The only reason “paper” wont know the answer is because traction is a variable. Which i said assuming traction isn’t an issue launch at peak torque.

Dumping the clutch vs slipping it obviously also adds a human element and another variable that can change things. Finding the sweet spot of dumping vs slipping it to keep from bogging down, burning out, or wheel hopping while launching at peak torque. That’s the driver skill portion. The rest is mechanical physics.

There's a lot more momentum built up in the flywheel at 7200 rpm vs. 4600 rpm.

I'm pretty sure @Berserker knows a thing or two about drag racing, I mean if you would do some research and realized his background in drag racing you wouldn't be questioning his methods LOL.

Good job on the 13.9! I'm going to need some pointers btw, I only managed a 15.2 that day I went to the strip on stock tires. I've only started to power shift recently and I managed to do a 15.0 on some 12 year old 205 16s lol