Tuning for Autocross - Ford Mustang Forum
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post #1 of 20 (permalink) Old 09-01-2013 Thread Starter
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Tuning for Autocross

I'm using the 87P bama tunes on my car (2012 V6 automatic) for street use, and I'm running 255/45x18s on my car in that configuration.

I recently purchased a set of 285/35x18s (and some wider wheels) for autocross use and will be using the 93R tune. Since these tires will only be on the car for autocross events, will the 93R tune I currently have be okay, or should I get a tune specifically for these tires (remember, my car is an automatic).

I won't be letting the car automatically shift, so my initial impression is that I don't have to worry about it. I want the best possible performance from the car in 1st through 3rd (4th and higher don't matter).

So should I get a new 93R tune just for autocross?


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post #2 of 20 (permalink) Old 09-01-2013
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That tire diameter is going to be a full inch shorter than 'regular', I believe. So, yes, you'll probably want a specific tune for the tire diameter, if only for an accurate speedometer reading.


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post #3 of 20 (permalink) Old 09-01-2013
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I wouldnt adjust anything for the shorter tires. If youre only using them for autox the speedo being off doesnt matter because of the short amount of time youll be on them

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post #4 of 20 (permalink) Old 09-01-2013 Thread Starter
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Quote:
Originally Posted by vivix View Post
I wouldnt adjust anything for the shorter tires. If youre only using them for autox the speedo being off doesnt matter because of the short amount of time youll be on them
That's what I was thinking. I have track wheels/tires that I'll be installing after I get to the event, and since the trans won't be shifting on its own, the speedo being off isn't a big deal. If I'm wrong on that, someone let me know.

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post #5 of 20 (permalink) Old 09-01-2013
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Quote:
Originally Posted by jsimmons View Post
That's what I was thinking. I have track wheels/tires that I'll be installing after I get to the event, and since the trans won't be shifting on its own, the speedo being off isn't a big deal. If I'm wrong on that, someone let me know.
Well I would think that the speedo being off would also lead to the rpm being off because it would say your going lets say 20 mph if your actually going 15 than the rpms will be inflated artificially I would think? Which could lead to you shifting too soon or too late.


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post #6 of 20 (permalink) Old 09-01-2013
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Originally Posted by powerwhee View Post
Well I would think that the speedo being off would also lead to the rpm being off because it would say your going lets say 20 mph if your actually going 15 than the rpms will be inflated artificially I would think? Which could lead to you shifting too soon or too late.


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The rev counter is based off of engine rpm and is not related to the rear wheels at all. So the revs indicated will be unaffected by the rear wheel diameter. If he isn't using the wheels for anything more than competition, it'll be fine leaving it as is. However since you're reflashing the car to 93R when you autox and back again when you drive streets, why not just have bama send you an updated 93r with your comp wheel size? The SCT device carries 3 tunes anyways. Just change label to "87P Street" and "93R Comp".

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post #7 of 20 (permalink) Old 09-01-2013
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For autocross, it's more about having a wide powerband and smooth throttle response than peak power. Having some extra rpm available to avoid a shift would be nice.
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post #8 of 20 (permalink) Old 09-01-2013
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The throttle response of the 93R tune, last I saw it, would be a disaster for autocross. Too punchy.

Ask Bama to give you a custom 93R tune that keeps the throttle calibration of the tune you use on the street, 87P.

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post #9 of 20 (permalink) Old 09-02-2013
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So what do you plan on doing with your Auto? you going to row it through the 1-2-3 as you need? I was wondering how it'd play out if I wanted to one day autocross, so let me know how it goes.

And yeah 740 is right the throttle is a bit twitchy on the 93R, it likes to jump out.

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post #10 of 20 (permalink) Old 09-02-2013 Thread Starter
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Quote:
Originally Posted by FutureSound View Post
So what do you plan on doing with your Auto? you going to row it through the 1-2-3 as you need? I was wondering how it'd play out if I wanted to one day autocross, so let me know how it goes.

And yeah 740 is right the throttle is a bit twitchy on the 93R, it likes to jump out.
At the last event, I tried starting out and left it in 2nd, and it wasn't fast enough off the line (of course, it might have been me making a concerted effort not to waste time/tries by doing a burn out at the start). I never really had to shift up/down. I was trying to avoid shifting because the lag between gears and the softness of the shift (even when shifting manually) would not have been beneficial.

I have a feeling the new tires are gonna cause me to go into 3rd on courses that don't especially favor little tiny cars.

I'll contact Bama about a 93R tune with something between 87P and 93R in terms of throttle calibration. I want better response, but I don't necessarily want to launch the car to the moon by breathing on the pedal.

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Not sure what tuner you have but on my DiabloSport InTune I can tweak my shift pressure and shift points (for both minimum MPH for each shift and their WOT shift point RPMs)
On the 93P BAMA tune (one I am playing with right now) at WOT the 1-2-3-4 were all set to 7050 RPM shifts the 4-5 was 6800 and 5-6 was 5000 not exactly sure what they had in mind there but OK...
I did "adjust" them all to 6850 (no headers/exhaust so it kind of flats out when you get it up past that high right now anyway) and I also bumped the shift pressures up across the board.

If you can adjust yours you would likely want to lower the MPH of the shift points to avoid deceleration down shifts from getting you squirrely heading into corners, and also think about the WOT shift points and pressures to again avoid breaking traction to keep the power to the ground.

Just curious but have you weighed your car since you did all of your mods? How much did it change your front/rear weight distribution?

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post #12 of 20 (permalink) Old 09-02-2013 Thread Starter
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Originally Posted by 2012v6Pony View Post
Not sure what tuner you have but on my DiabloSport InTune I can tweak my shift pressure and shift points (for both minimum MPH for each shift and their WOT shift point RPMs)
On the 93P BAMA tune (one I am playing with right now) at WOT the 1-2-3-4 were all set to 7050 RPM shifts the 4-5 was 6800 and 5-6 was 5000 not exactly sure what they had in mind there but OK...
I did "adjust" them all to 6850 (no headers/exhaust so it kind of flats out when you get it up past that high right now anyway) and I also bumped the shift pressures up across the board.

If you can adjust yours you would likely want to lower the MPH of the shift points to avoid deceleration down shifts from getting you squirrely heading into corners, and also think about the WOT shift points and pressures to again avoid breaking traction to keep the power to the ground.

Just curious but have you weighed your car since you did all of your mods? How much did it change your front/rear weight distribution?
The SCT tuner doesn't allow you to mess with any values in the tune. I don't know if that's because of the tuner itself, or the tune being locked somehow.

I'm going to manually shift, so the "automatic" part of the equation is off the table. Weight distribution is (or should be right around stock values. I still have to relocate the battery (I have the parts for that, it's just been too freakin' hot to work on the car).

I might also be adding a trailer hitch (so I can build myself a tire trailer), so that will add about 30 pounds to the back of the car.

I sent Bama a question about an auto-cross-specific tune. I don't expect an answer before tomorrow afternoon.

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Quote:
Originally Posted by jsimmons View Post
Weight distribution is (or should be right around stock values. I still have to relocate the battery (I have the parts for that, it's just been too freakin' hot to work on the car).

I might also be adding a trailer hitch (so I can build myself a tire trailer), so that will add about 30 pounds to the back of the car.
Pretty sure that Watts link setup added a good chunk of weight to the rear...

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post #14 of 20 (permalink) Old 09-02-2013 Thread Starter
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I would say a net weight gain of maybe 10 pounds, certainly no more than 15.

The fiberglass hood I'm running may have added that much to the front.

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Whatever you run, try and get as linear throttle response as possible. The Bama "race" tunes are no good, makes the gas to much of an on/off switch for my liking.


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