Drag/Acceleration Mods to improve ¼ mile times and unofficial track thread

[KLR STINGER]

EwG control please. Remember is fully catless guys still have issue in cold weather that would greatly benefit from direct wgdc support!

 

[StungBlueGT2]

I'm just curious how @Kato_the_kia_stinger put down his numbers. 11.599 @ 118.77, 7.464 @93.86, 1.614
Was this just a lucky run where everything hooked up, or does he (or anyone else) have a repeatable, reliable method? I'll have to try @Tonkabob method and see how it goes. crazy numbers here:

Drag/Acceleration - The Official 1/4 mile track thread.​

Nothing special and pretty sure Kato and almost everyone else uses the same simple method. Turn on brake switch, hold throttle down until ~2800rpm(torque converter limits) and sidestep brake pedal for a boosted launch.

Tonkas situation is different because his ECU tune removed safety limits which allows for 20psi+ boost in first gear when stock Stingers rarely see more than 10-12psi. Like Terry said, all that extra boost in first gear must be why he has different launches then everyone else using the brake switch.

 

[Tonkabob]

What is the code ID? It should be an over boost fault code.

In any event there is definitely more potential wear and tear but you're going to be stuck .2-.3ths behind everyone else unless you get it sorted. On my to-do list is to figure out JB4 EWG control which would make lowering boost on flash maps much more direct.

The code was P0200. Injector fault.

 

[Tonkabob]

Ok I'm either a glutton for punishment or a great Stinger advocate....
I did 4 beast mode brake snip tests this morning. 1,2,4 where on map 0 with different amounts of throttle. 1, 2 didn't cut throttle, 4 was a tire smoker and throttle cut. All 4 tests were slower than LC. Looks like 2 issues. Timing cuts to deal with high boost and shortly after high pressure fuel drops to 5 (I assume 5 is bad? - 10-11 looks normal) and then throttle cuts. So looks like a combo of over boost and fuel pressure.

Run 3 was Map 4 valet mode. Big timing drops to keep the boost in check and thought I heard some blow off during brake boost.
I guess I do need to dial back my 1st gear just a bit as even during normal runs I get a slight timing dip during that 22 PSI spike.

Here is run 3 valet mode and the most aggressive map 0 launch.

 

[Terry@BMS]

Thanks. Looking at map 4 seems like the lowest we can get boost in 1st gear here is that ~19psi peak. Not really low enough to do do what we want. Lowering boost in the flash either in just 1st gear or across the board would probably be a good move.

On fuel pressure dropping looks like it was just making a lot more power there. If it's a trend then may need to lean out air/fuel ratio in that range or at least lower boost.

 

[Tonkabob]

Thanks. Looking at map 4 seems like the lowest we can get boost in 1st gear here is that ~19psi peak. Not really low enough to do do what we want. Lowering boost in the flash either in just 1st gear or across the board would probably be a good move.

On fuel pressure dropping looks like it was just making a lot more power there. If it's a trend then may need to lean out air/fuel ratio in that range or at least lower boost.

View attachment 30761

What kind of fuel pressure number do you consider bad when running high E content like over E30?
I'll try to get 1st gear boost lowered.

 

[Terry@BMS]

Normally around 5 is where we'd cut boost if it stayed there for more than a second or two.

 

[KingLamoni]

My commute is 1.5 miles each way

My commute is 51 miles each way.

 

[Tonkabob]

Isn't it bad to change maps back and forth?
The ECU needs time to readapt.

Yeah i think you could be right. Spoofing boost up or down is going to mess with ecu adaptives when i go back to map 0, or even if i change the amount of boost spoof.

 

[Tonkabob]

I think I caught a piggy back infection. I was trying +3 PSI last week so the ECU saw 17-18 PSI in 4th gear (21 PSI actual) and pulled timing evenly across the board, like it would with out the boost spoof at 21 PSI. Since the ecu seen boost was fairly low the timing pull must have been torque related.
Few days later doing a pull with no boost spoof and again in 4th gear 17-18 actual PSI, across the board timing pull. I was able to hit 20 PSI cleanly in 4th before that learned correction. Just reset the ECU for an hour in hopes it forgets its bad habits.
Wonder what bad habits it learned doing reduced boost in valet and boost by gear? But I think xot1 is right that its better to do fewer changes and let them ride.

 

[Thorne]

on your one launch where it cuts have you noticed weather or not your trims are really high? So I hit a new cut yesterday, I am working on my map6 setup where it tapers more boost in up top but in early testing I tried for a shit ton down load and I watch fuel trims go to 50 and hpfp go sad.
If you want to use the JB4 to control launch we need terry to make a special LAUNCH map were we can limit boost to X then pour it in and you would need for John to pull some boost out of your main map.


As for Snipping my wire.... I'm am tempted to do so, I won't have time to drive back out to seattle until first of the year and I'm not sure I can wait that long lolol.

 

[Thorne]

Thanks. Looking at map 4 seems like the lowest we can get boost in 1st gear here is that ~19psi peak. Not really low enough to do do what we want. Lowering boost in the flash either in just 1st gear or across the board would probably be a good move.

On fuel pressure dropping looks like it was just making a lot more power there. If it's a trend then may need to lean out air/fuel ratio in that range or at least lower boost.

View attachment 30761

Looks like he is seeing the same thing as me, When you hit ~20psi downlow in first gear the hpfp gets angry, I personally don't think leaning it out is a great idea during intial spool, BUT dialing back the boost in that area might help. I'll do some more testing this weekend and se what I found.

 

[Thorne]

I think I caught a piggy back infection. I was trying +3 PSI last week so the ECU saw 17-18 PSI in 4th gear (21 PSI actual) and pulled timing evenly across the board, like it would with out the boost spoof at 21 PSI. Since the ecu seen boost was fairly low the timing pull must have been torque related.
Few days later doing a pull with no boost spoof and again in 4th gear 17-18 actual PSI, across the board timing pull. I was able to hit 20 PSI cleanly in 4th before that learned correction. Just reset the ECU for an hour in hopes it forgets its bad habits.
Wonder what bad habits it learned doing reduced boost in valet and boost by gear? But I think xot1 is right that its better to do fewer changes and let them ride.

I'm not sure how fast the adaptives happen. I'd like to know as well, Its frustrating that from a roll I'm a monster and from a dig I'm amonster 1 out of 10 launchs...


BUT atm my best launch is currently map4 using launch control

 

[Tonkabob]

I'm not sure how fast the adaptives happen. I'd like to know as well, Its frustrating that from a roll I'm a monster and from a dig I'm amonster 1 out of 10 launchs...


BUT atm my best launch is currently map4 using launch control

I did the reset and car ran good today. Didn't get into 4th gear much however.
3.84 0-60 and a pair of 7.66 1/8th at 94.5.
Did some iat 100 and + 1 psi is as high as i went on boost.
On limp snip or LC high pressure stays above 8 and trims below 35.
Beast mode high pressure can hit 5. I think trims are still 35 and under but would need to double check.

 

[Terry@BMS]

Looks like he is seeing the same thing as me, When you hit ~20psi downlow in first gear the hpfp gets angry, I personally don't think leaning it out is a great idea during intial spool, BUT dialing back the boost in that area might help. I'll do some more testing this weekend and se what I found.

Yes I emailed you a few ideas but I'd lower the boost target just in 1st gear on the flash side and lean the AFR target out to give the fuel pump a chance of keeping up. I'm not sure CPI or WMI is going to inject enough volume fast enough for it to make a difference in 1st gear.

 

[Thorne]

Yes I emailed you a few ideas but I'd lower the boost target just in 1st gear on the flash side and lean the AFR target out to give the fuel pump a chance of keeping up. I'm not sure CPI or WMI is going to inject enough volume fast enough for it to make a difference in 1st gear.

Sadly I can't update my flash atm, I don't have time to mail my ecu over atm..

 

[Tonkabob]

I tried IAT spoof to 95 in when the actuals were around 55. Didn't spoof any boost and it overboosted hard and fast, limp mode. So going back to just trying to add a little boost. My tests earlier this week with more boost and snip ended up being the same as map 0 and stock LC. 11.73, 11.75s. I'll try some more LC launches with a little extra boost to see If I can drop the times at all. In the cold the snip is adding almost nothing as I get a little over boost timing pull in 1st using the snip where LC does not so they pretty much equal out. I think it will be hard to get back in the 11.5s on this 92 octane tune even with the extra jb4 boost.

 

[Terry@BMS]

Weather was in the 30s back then though, I'm sure that will help. I'd definitely up the octane with a can of octane booster or unleaded race gas too when playing around.

 

[KingLamoni]

I tried IAT spoof to 95 in when the actuals were around 55. Didn't spoof any boost and it overboosted hard and fast, limp mode. So going back to just trying to add a little boost. My tests earlier this week with more boost and snip ended up being the same as map 0 and stock LC. 11.73, 11.75s. I'll try some more LC launches with a little extra boost to see If I can drop the times at all. In the cold the snip is adding almost nothing as I get a little over boost timing pull in 1st using the snip where LC does not so they pretty much equal out. I think it will be hard to get back in the 11.5s on this 92 octane tune even with the extra jb4 boost.

What do you have to do to reset it when it goes into limp mode?

 

[Tonkabob]

What do you have to do to reset it when it goes into limp mode?

Just restart the car and boost comes back.