Tune for bracket racing consistency

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Tune for bracket racing consistency

Unread postby Patricktjms » Wed Feb 21, 2018 8:07 pm

I am wondering about using the U4P2 for bracket racing. I want the car to be as consistent as possible and predictable to weather change. I am used to carb fueled cars. What is suggested for consistency and predictability? Locked timing and open loop would be my first two guesses. Any suggestions?
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Re: Tune for bracket racing consistency

Unread postby decipha » Thu Feb 22, 2018 5:24 am

when you tune your ecu properly it will run the engine as efficiently as possible for all given conditions.
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sun Mar 04, 2018 7:04 pm

In reading your transmission write up, you specify to divide old tire size by new tire size and multiply it by old gear divided by new gear. But in the example you show, you divided the tire sizes opposite of what you stated. Can you clarify please?

I am going from 273 to 410 gear and from 25.7 to 28 inch. It makes quite a difference if you divide the other way.
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Mon Mar 05, 2018 9:34 am

Got it figured out.
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Re: Tune for bracket racing consistency

Unread postby decipha » Mon Mar 05, 2018 1:28 pm

i see what your saying, i'll flip it around in the write up, but yea the example is correct
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Tue Mar 06, 2018 7:55 am

Just double checking, the u4p2 tune shouldn't need anything extra changed for cat-less exhaust? Other than obviously tuning for fuel needs as normal?
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Re: Tune for bracket racing consistency

Unread postby decipha » Wed Mar 07, 2018 7:20 am

no, cats do not affect the tune
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Mon Mar 12, 2018 4:22 pm

Aode equipped so I need to set mechanical idle IN GEAR at or <50 rpm above NUBASE? not in neutral or park correct?
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Re: Tune for bracket racing consistency

Unread postby decipha » Mon Mar 12, 2018 5:57 pm

you should
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sat Mar 17, 2018 11:47 am

So when setting the idle mechanically in gear, I have found that everything is great when in open loop, but when it switches to closed-loop, the car will not idle in park. It's like it stops adding idle air when it goes to closed loop. I know I shouldn't be setting idle in open loop, it's just something that I noticed when it switched back to open loop after dying and restarting.

If you open the throttle stop to where it will idle in park in closed loop, it will run away with you when you drop it into gear.
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Re: Tune for bracket racing consistency

Unread postby decipha » Sat Mar 17, 2018 6:07 pm

closed loop and open loop are fueling only, if its making the idle change that means your fueling is off and the hegos are compensating making the engine more efficient and raising the rpms

if its idling fine in park and u toss it in gear and it takes off u need to reduce fn1862d the drive isc multiplier table so its not opening the iac as much

also another good thing, it makes for a much nicer transition for the dashpot min clip if u set dasmph to 0.5 mph and set dasmphhys to 12 mph, that way when u let off the brake and idle in gear dasmin doesnt take over and drag u forward til u get over 12.5 mph which u shudnt at closed throttle, then dasmin will kik n and let it coast down to 0.5 mph before decaying dasmin out making for a very nice and smooth transition

set minmph and mphctl to 25 mph, as well as setting dasctl to 0.35 and make sure you dont dasmin clip above .35
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sat Mar 17, 2018 7:15 pm

Thank you for the suggestions.

The idle is actually opposite of that. It idles great when in gear during closed loop but when you go into park it absolutely won't idle unless tps is open to .04. Ispbm r remains at 0.0
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Re: Tune for bracket racing consistency

Unread postby decipha » Sat Mar 17, 2018 9:20 pm

if ipsibr isnt kicking up to maintain dsdrpm then your not setting the idle flag
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sun Mar 18, 2018 1:40 pm

Thank you for all the recommendations. It seems to be fairly happy right now.......

Went to change cooling fan on/off speed and now the fan stays on regardless of temps I enter. Any clues where to start with that?
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Tue Mar 20, 2018 8:33 am

I don't suppose this could be a relay issue instead of a tuning typo could it?
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Re: Tune for bracket racing consistency

Unread postby decipha » Tue Mar 20, 2018 8:39 am

unless u put the turn on fan temp extremely low then no

most likely you have aftermarket fan wiring and who ever ran it didnt run a double relay so it fused it shorted open
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Tue Mar 20, 2018 1:46 pm

It's the oem fan and wiring. I will look at the ccrm and start there. Thank you!
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sat Mar 24, 2018 6:06 pm

What is Des-slip on the dashboard and why is it at a constant 1020? Is that correct?
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Re: Tune for bracket racing consistency

Unread postby decipha » Sat Mar 24, 2018 6:28 pm

thats the amount of tq converter slip the ecu is commanding of the tq converter, 1020 being full slip, if it stays there then you don't have it commanding lock up
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sat Mar 24, 2018 6:31 pm

Perfect. Thank you sir. So is there a way to put fuel strategy on the dashboard? I see it in the edit gauge window but I can't seem to get it to display.
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Re: Tune for bracket racing consistency

Unread postby decipha » Sat Mar 24, 2018 11:25 pm

Can u elaborate more? the lambse and kamrf are on the dashboard
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sun Mar 25, 2018 9:23 am

When you are in the edit gauges window, there's a bitmap labeled FLAGS3. I was wanting that on the dashboard so I could review logs and see what the fuel source was doing
Under different conditions but it won't let me choose it for display.
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sat Apr 14, 2018 9:50 am

When testing the car at the track last night, I have WOT shift points at 4k and it shifts into 2nd at 5500, and into 3rd at 5000. Any way to lessen the delay?

Also the 1-2 shift is very lazy and long. 2-3 is quick and firm. How can I make the 1-2 feel the same?
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Re: Tune for bracket racing consistency

Unread postby decipha » Sun Apr 15, 2018 7:26 pm

lower the vehicle speed in the shift functions not just the wot scalars

reduce the shift slope scalar to give it more line pressure on shift, or/and increase the torque values in that range in the engine tq table
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sat May 19, 2018 2:22 pm

Adjusting speed in the shift functions had no effect on my WOT shift rpms. Still occurring 1k-1500 rpm late.

I did notice on the dashboard that RVSS and VSS are off from each other by a progressive amount as speed increases. Could this be part of the issue? And how do I correct this?
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Re: Tune for bracket racing consistency

Unread postby decipha » Sat May 19, 2018 5:20 pm

you have to dial in nvbase, its in the trans write up on the homepage
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Tue Jul 10, 2018 6:25 pm

Ok...so i have a lot of track time with this car now and i have tweaked about all i know to tweak. It runs consistant but slow. which is fine. but i just realized i didnt compensate for the fuel pressure change to 55 lbs by raising the hi slope. I changed it by the % of fuel pressure change and i will test tomorrow but i noticed something. I run the car in open loop and demand 1.05 all the way up to 90 load. it works for me right or wrong. but when i play back a recording, it shows commanding lambse anywhere from 1.00 down to .922 what is causing it to demand a value that isnt in any cell whatsoever? ill try and attach the recording of the run and the tune. any advise appriciated.
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Re: Tune for bracket racing consistency

Unread postby decipha » Tue Jul 10, 2018 8:39 pm

more than just the high slope

load has no affect on fuel perload does, are you interpolating?
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Wed Jul 11, 2018 5:51 am

No I dont believe I am. I'm just wondering why it is commanding fuel that isn't in any block on the table. How is that possible?
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Re: Tune for bracket racing consistency

Unread postby decipha » Wed Jul 11, 2018 7:13 am

it sounds like its doing exactly what its supposed to

you have to interpolate the value
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94 5spd Rionda
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Wed Jul 11, 2018 10:07 am

I don't have anything horribly messed up in the tune that I posted above do I?
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Re: Tune for bracket racing consistency

Unread postby decipha » Wed Jul 11, 2018 12:57 pm

sounds like all is working correctly so I didnt bother to look
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92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
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00 Explorer 5L - Bernyce

Re: Tune for bracket racing consistency

Unread postby Patricktjms » Fri Jul 20, 2018 2:23 pm

I got that all sorted out. Much better now. Car repeats very consistently.

I am putting in my good C4 and converter this weekend. Do I need to change to the T4M2 tune or will the U4P2 tune work ok still?

If I need to change, is there an easy way to transfer all of my little changes over to the T4M2?
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Re: Tune for bracket racing consistency

Unread postby decipha » Fri Jul 20, 2018 7:27 pm

no the c4 isnt controlled by the ecu so its still a manual trans basically

if u have stalling issues going in and out of gear you can wire up the nds and set trload to differentiate neutral and drive still with t4m2 tune tho
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94 5spd Rionda
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Sat Jul 21, 2018 2:42 pm

I realize how the c4 transmission works, I am taking out my AODE transmission. Can I still run the tune that I have? Or do I need to change over to the T4M2 tune?
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Re: Tune for bracket racing consistency

Unread postby decipha » Sat Jul 21, 2018 7:55 pm

you can swap between an auto and manual pretty easily just set trload and tstrat to 0, theres a few little tidbits in the background that needs to be adjusted to disable any codes that pop up but its no biggie
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Tue Aug 21, 2018 6:38 pm

So my c4 swap went great, the t4m2 tune works wonderful with no stalling going in gear or anything.

One question is what table do I need to start in to shorten the hangtime that happens at about 1400 rpms after a rev or a run? It comes down very nice till 1400 then hangs for about a 5 count before going to idle very quickly.
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Vehicle Information: 1994 mustang gt 5.0 stock. Bracket car. Aode. K&n filter, pypes short headers, 2.5 off road pipe with 40 series flowmasters, no smog no egr, 255 pump adjustable fuel preasure @ 55, small shot for finish line driving. 4.10 with 295/55-15 m/t drag radials. Stock ecu cbaza

Re: Tune for bracket racing consistency

Unread postby decipha » Tue Aug 21, 2018 8:46 pm

dashpot
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91 4r70w - Skarlett
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Re: Tune for bracket racing consistency

Unread postby Patricktjms » Fri Aug 24, 2018 8:52 pm

Everything is working great. Car picked up .8 quarter mile.

Slight issue, when I deck it on the starting line there's what I can only describe as a delay almost like a lean bog. But it does it even when not under load. Just a normal rev. What does the tune need to make the throttle response instant? If it was a carb I'd say it needs a bigger pump shot.
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Posts: 23
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Vehicle Information: 1994 mustang gt 5.0 stock. Bracket car. Aode. K&n filter, pypes short headers, 2.5 off road pipe with 40 series flowmasters, no smog no egr, 255 pump adjustable fuel preasure @ 55, small shot for finish line driving. 4.10 with 295/55-15 m/t drag radials. Stock ecu cbaza

Re: Tune for bracket racing consistency

Unread postby decipha » Fri Aug 24, 2018 10:27 pm

if your fuel is dialed in then go adjust the manifold volume to get the pump shot where you want it
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91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
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