'14 GT Automatic - drag racing results from a few simple mods

[Five Oh Brian]

Consider how much better it would be with the 3.15 and not having to go into 4th.

Sure, but if I go any faster, I'll need a 6 point rollbar and I'd lose the use of my back seat, so I'll keep my "slow" 4.10 gears for now.

 

[wbt]

Sure, but if I go any faster, I'll need a 6 point rollbar and I'd lose the use of my back seat, so I'll keep my "slow" 4.10 gears for now.

Heh.....if you are going that route then why not put more gear in it and maybe shoot to shift into 5th before the end? May as well make use of as many gears/shifts as possible and get your money's worth from that trans.

 

[rcm90]

Heh.....if you are going that route then why not put more gear in it and maybe shoot to shift into 5th before the end? May as well make use of as many gears/shifts as possible and get your money's worth from that trans.

5.14 gear FTW!!!

 

[KrisR]

It will be interesting to compare my very similar setup with 3.15s to yours with 4.10s. My car is probably a little lighter but you have an aftermarket drive shaft, and I'm on e85 fuel. My old car 60'ed in the 1.60-1.64 range, best of 1.59, with 3.15s. This car may 60' a little better with the factory intake manifold vs the Boss on my old car, at least theoretically.

 

[FIVE-OH]

Heh.....if you are going that route then why not put more gear in it and maybe shoot to shift into 5th before the end? May as well make use of as many gears/shifts as possible and get your money's worth from that trans.

LMAO...

 

[KrisR]

Converter and gears are in, actually ended up doing 3.15 gears, perfect with these tires and stock manifold.
Racestar 15x8 with 255/60 M/Ts, 17x7 with BFG T/A 215/60-17s. Track ready!

 

[Five Oh Brian]

KrisR, your car looks great on those wheels/tires. Can't wait to see how it runs now, especially with the converter. I'd expect your car to run quicker than mine.


Sent from SYNC in my '14 Mustang GT...

 

[Five Oh Brian]

Heh.....if you are going that route then why not put more gear in it and maybe shoot to shift into 5th before the end? May as well make use of as many gears/shifts as possible and get your money's worth from that trans.

For a brief moment last year I considered 5.14's, but then I regained sanity.

I know some of you think I messed up by going with 4.10's and maybe I did, but my car is the quickest NA Coyote/6R80 at either of our local tracks. I know there must be plenty of faster ones out there, but I haven't seen one around here.


Sent from SYNC in my '14 Mustang GT...

 

[KrisR]

KrisR, your car looks great on those wheels/tires. Can't wait to see how it runs now, especially with the converter. I'd expect your car to run quicker than mine.

Thanks! We will see. I figure 11.60s-11.80s and I'll be OK with that.

 

[Five Oh Brian]

I'll be racing again tomorrow (Bremerton Raceway). A friend of mine with a Procharged '12 GT Automatic will be there, as well. I'll be hoping to beat last week's 11.57 run and he'll be hoping to get into the 10's (he typically runs 11.2's and 11.3's around 124-125 mph), but I'm totally okay if I run 11.6's and 11.7's all day.

 

[wbt]

For a brief moment last year I considered 5.14's, but then I regained sanity.

I know some of you think I messed up by going with 4.10's and maybe I did, but my car is the quickest NA Coyote/6R80 at either of our local tracks. I know there must be plenty of faster ones out there, but I haven't seen one around here.


Sent from SYNC in my '14 Mustang GT...

I have tuned several that are and they all have less gear.

Here is a pretty decent list of N/A cars with mods and times: http://www.modularfords.com/threads/185818-Bolt-on-2011-2013-Mustang-GT-5-0-Drag-Racing-ET-List

 

[Five Oh Brian]

I have tuned several that are and they all have less gear.

Here is a pretty decent list of N/A cars with mods and times: http://www.modularfords.com/threads/185818-Bolt-on-2011-2013-Mustang-GT-5-0-Drag-Racing-ET-List

Thanks for the link. Every car on that list that's faster than my car - and that lists its mods - shows weight reduction. I run my car at a very heavy 3800-3850 lb race weight. Most of them show CAI's, LT's, and aftermarket intakes, as well. I have none of those items! Stock airbox with factory paper filter, stock intake and exhaust manifolds, stock suspension, etc. I only have a couple of key mods, yet my car runs very well considering the very minimal investment I've made in choosing mods. Please give some credit where credit is due.

And again, I know there are quicker N/A Coyotes than mine out there, but I have never seen one at our two local tracks. The vast majority of bolt on Coyotes with drag radials run low to mid '12's, with many closer-to-stock Coyotes on street tires running low to mid '13's (or worse), depending on driver talent. 11 second N/A Coyotes are super rare at our local tracks, so my car attracts a fair amount of attention since it stands out.

As for the gear argument? Can we get past that? I like 4.10's for how they behave on the street. I don't believe for a minute that it slowed my car down vs 3.15's at the dragstrip. Might not have made it any/much quicker, either, but it sure did not slow it down. Crossing the stripe in 3rd or 4th doesn't seem to matter to a tuned/stalled 6R80. The extra shift is only a few milliseconds, and with a 5,000 rpm stall converter, a WOT upshift never drops the revs below peak torque.

At this point, I can't really mod my car anymore, anyway. NHRA requires a rollbar under 11.50 in the 1/4 mile and our local tracks enforce the rule. My car is a true daily driver and I need my backseat, so I will never put a rollbar in my car. So, 11.50's and 11.60's is all my goal has ever been with this car and I'm there now.

I'm proud of how my car performs and how simple it was to get there. I hope my experiences help others looking to build a mid 11 second Coyote / 6R80 on a budget.

 

[wbt]

Crossing the stripe in 3rd or 4th doesn't seem to matter to a tuned/stalled 6R80. The extra shift is only a few milliseconds, and with a 5,000 rpm stall converter, a WOT upshift never drops the revs below peak torque.

That is the crux of the argument and simply not true. The extra shift takes longer than milliseconds and if the converter is locked, stall speed doesn't make a difference. The only time that stall speed matters with a lockup converter is when launching the car.

...and regardless of rear gear in the car, RPM drop between shifts is the same.

The key things to look at are how long the car is in the optimal RPM range, when is the right place to lock the converter, and where in the RPM range the car is when going through at the end.

If one figures out the formula to the above they will be successful with the right combination of parts and tuning.

Your car runs good but I think it could be better is what I am saying.

 

[Five Oh Brian]

That is the crux of the argument and simply not true. The extra shift takes longer than milliseconds and if the converter is locked, stall speed doesn't make a difference. The only time that stall speed matters with a lockup converter is when launching the car.

...and regardless of rear gear in the car, RPM drop between shifts is the same.

The key things to look at are how long the car is in the optimal RPM range, when is the right place to lock the converter, and where in the RPM range the car is when going through at the end.

If one figures out the formula to the above they will be successful with the right combination of parts and tuning.

Your car runs good but I think it could be better is what I am saying.

I appreciate your input. Mike Rousch did a great job tuning my car despite his warnings against the 4.10 gears. He has my converter lock-up and shiftpoints perfected.

I'm heading to the track in about an hour to see how consistent the car runs hotlapping (today is a test n tune session). An 11.49 would really make my day, but I'm only expecting 11.60's and 11.70's based on today's weather.


Sent from SYNC in my '14 Mustang GT...

 

[CoreGT]

Good luck!

 

[KrisR]

Have fun and good luck. I'm going tomorrow to test mine out!

 

[Five Oh Brian]

Have fun and good luck. I'm going tomorrow to test mine out!

Please keep us posted on your results!

 

[Five Oh Brian]

Good luck!

Thank you! Would have loved to have had you join us at Bremerton today. Only two of us there with Coyotes. Mine and my friend Bob with his '12 GT automatic with a Procharger. Bob was chasing 10.99's or better, but had to settle for 11.20's @ 127. He asked me to make a couple passes for him in his car and I could only muster a best of 11.21 @ 126 in his car, but we did get his 60' times much improved over his prior attempts (typically 1.8's and 1.9's in the past, but today we got them into the 1.6's). His car is certainly faster than mine!

 

[Five Oh Brian]

I'm heading to the track in about an hour to see how consistent the car runs hotlapping (today is a test n tune session). An 11.49 would really make my day, but I'm only expecting 11.60's and 11.70's based on today's weather.

So, back from the track and had a decent day. Two weeks ago, I ran a best of 11.57 @ 117.55 with a DA a couple hundred feet below sea level. Backed that up with a couple of 11.62's and an 11.65 (see prior post).

Today, the DA was about 50' to couple hundred feet above sea level, so about 200-400' worse than my last track day. I offset that a bit by running less fuel in the car (7 gallons less, so about 40 lbs lighter today). Otherwise, no changes to my car.

First pass of the day was 11.616 @ 118.92 on a 1.632 sixty foot. That's the best trap speed this car has ever run. Backed that up with a pair of nearly identical 11.61's (11.614 and 11.619), and an 11.642. Talk about a consistent bracket car! Too bad today was just Test n Tune!

Then, I experimented with my launches to see how the converter would react to holding more revs, but only hurt my ET's doing so. Ran an 11.803 @ 118.03 nearly pushing the front tires through the beams against the brakes trying to hold too many rpm's, and an 11.842 doing the same, but nailed a best-ever for this car 1.607 sixty foot. A very strong headwind slowed down our later passes (my 118 mph trap speeds dropped to 115, while Bob's 127 mph trap speeds dropped to 122).

Both of us had fun, had decent runs, and didn't break anything. Win, win, win!

Here's my best timeslip from today, then all six of them to compare. As always, I'm car # 2061....

 

[Five Oh Brian]

Is Bremerton any less strict about tech? Do they prep well?

You may be happy to hear that Bremerton didn't say anything about my friend, Bob, running 11.20's all day today without a rollbar. You car's 10.20's might get their attention, but you never know until you try.....