What am I missing in these JB4 logs?

[Mr. Tech]

Hey guys, I was reading through the 0-60 and 1/4 mile threads and started comparing fast Stinger logs to mine. I'm seeing some logs that look nearly identical to mine, but some of the other Stingers are a full half second faster than mine to 60 with similar or fewer mods .

I've attached two logs as a quick example. The log with the white background is from @Get Stung, the black background is mine. Based on the logs, I hit peak boost faster, and maintain similar boost numbers through the first three gears. My AFR and ignition timing are also very similar to his. The only significant difference is in the fuel trims. His are a bit higher through 1st gear, but about the same as mine in 2nd and lower than mine in 3rd. It's my understanding that the fuel trims move up/down to keep your AFR on target.

EDIT: After looking at the graphs on a larger screen, I can see that his ign 1-6 are considerably higher. That would definitely make a big difference.

EDIT 2: Added another log. I don't remember who's log this is, but I believe this person's car was about .4 seconds faster than mine with similar mods/conditions.

Is there anything else I'm missing in these logs? My average 0-60, down an on-ramp, is 4.8 seconds with a JB4 on Map 2 with 93 octane and DIY intakes with AEM filters. AWD GT2, stock 19" wheels with stock Pilot Sport tires. Ambient temp of around 75 degrees and only 250 feet above sea level.

Basically, does anything stand out in my log that explains why my car, in general, seems to be one of the slower Stingers when compared to Stingers with similar or fewer mods?

Side note, I understand that Get Stung has a unicorn of a Stinger, but the differences when comparing other Stinger logs to mine are similar. Also, I think this was a Map 3 run for Get Stung compared to my Map 2 run, hence the 1PSI peak boost difference.

 

[StungBlueGT2]

I’m sure Terry@BMS or others can explain better but I have a few questions and a couple observations.

What is you method of launching? Are you using full WOT from stop, Sport mode, traction control off and launch control? And are you using top tier fuel, if so what brand?

I notice three things compared to the other logs. They both achieve full throttle much quicker and build boost in half the time, which makes a huge difference at the beginning of the launch, especially for AWD. Also you have a lot of variance in you ignition timing which indicates poor fuel, or inadequate octane levels for the map level.

Just looking at logs it looks like you have a delayed launch and your ignition is being restricted which is hurting your performance. Your 0-60 results aren’t bad but definitely lower than most. I and many other Stingers dropped 0.2 seconds just from intakes and I personally(RWD) went from ~4.8 stock to ~4.6 after only intakes at 90degrees & at sea level. Most AWD are about 0.1-0.2 sec slower on stock Stingers but even less on chip/tuned Stingers due to the traction advantages of AWD.

You don’t seem to be getting the advantages of an AWD, WOT launch and are limiting the performance of acceleration in gears 1-3 due to lower ignition timing, likely due to inadequate fuel octane.

Good news is that you should be able to easily resolve those issues to drop 0.3-0.4 and use the BMS brake switch to drop another 0.3-0.4 to be in the low 4sec range for 0-60. Sorry for the long explanation but hope this helps and good luck on your pursuit for an answer.

 

[Terry@BMS]

I'd need a CSV of each run to do any sort of comparison.

 

[Mr. Tech]

I’m sure Terry@BMS or others can explain better but I have a few questions and a couple observations.

What is you method of launching? Are you using full WOT from stop, Sport mode, traction control off and launch control? And are you using top tier fuel, if so what brand?

I notice three things compared to the other logs. They both achieve full throttle much quicker and build boost in half the time, which makes a huge difference at the beginning of the launch, especially for AWD. Also you have a lot of variance in you ignition timing which indicates poor fuel, or inadequate octane levels for the map level.

Just looking at logs it looks like you have a delayed launch and your ignition is being restricted which is hurting your performance. Your 0-60 results aren’t bad but definitely lower than most. I and many other Stingers dropped 0.2 seconds just from intakes and I personally(RWD) went from ~4.8 stock to ~4.6 after only intakes at 90degrees & at sea level. Most AWD are about 0.1-0.2 sec slower on stock Stingers but even less on chip/tuned Stingers due to the traction advantages of AWD.

You don’t seem to be getting the advantages of an AWD, WOT launch and are limiting the performance of acceleration in gears 1-3 due to lower ignition timing, likely due to inadequate fuel octane.

Good news is that you should be able to easily resolve those issues to drop 0.3-0.4 and use the BMS brake switch to drop another 0.3-0.4 to be in the low 4sec range for 0-60. Sorry for the long explanation but hope this helps and good luck on your pursuit for an answer.

Wow! I was hoping for at least some guidance, but didn't expect this much detail and help! Huge thanks!!

To answer your questions, I'm using launch control, so Sport mode with traction and stability control off, firm on the brake, gas to the floor until I hit about 2000-2100RPM, then drop the brake and go.

I'm using Top Tier 93 octane from Shell. But I had a bad fill of BJs wholesale 93 octane that I found out wasn't top tier after the fact :/. That was the last tank of gas. Right now I have about 10 gallons of Shell 93 to 1 gallon of the 93 BJ's gas.

EDIT: I just realized the log I posted is from a while ago, on shell 93, with no "bad" gas mixed in. It was Map 2, no intakes, no fuel wires, down an on-ramp. END EDIT

For comparison, I've attached the best run I've had, a few weeks ago, with stock intakes and just the JB4, Map2 (no fuel wires), 100% 93 octane from Shell and only about a gallon in the tank, down another on-ramp. This was a 4.55 0-60 run. But it was a unicorn run for sure. Definitely not repeatable haha. How's the timing look on this one?

I'll drop back to map 1 or 0 for a bit and see if I can find some octane booster to use in my next fill.

Thanks for the help! You've given me hope that this is fixable haha.

 

[Mr. Tech]

I'd need a CSV of each run to do any sort of comparison.

Hi Terry, here you go! There a second log in my previous past as well

 

[xot1]

The timings don't look good in the black background log

 

[Mr. Tech]

Thanks for the feedback guys! I've switched back to Map 0 for now and the timings are much tighter. Now here's the part that I'm still trying to figure out. Any idea why Terry and others are able to run Map 2 with fuel wires and an intake on straight 91 octane, but I can't seem to run Map 2 with the same mods and Shell 93?

Perhaps that's a super loaded question. Does it have to do with the atmospheric pressure? So, if someone lives a mile up in the mountains, they could run Map 2 on 91 because the atmospheric pressure is about 2.7 PSI less than what I'm seeing at sea level (~14.7 PSI)? So 15 pounds of boost would be a total of 17 PSI in the mountains vs 19.7 PSI at sea level. Thus, the extra compression requires higher octane? I'm also making the assumption that the PSI readout is relative to ambient, not absolute pressure.

So, in theory, I should be able to run the same 0-60 time with 13 pounds of boost as someone in the mountains running 15.7 pounds?

 

[Revvdmedia]

Mr. Tech your ignition timing shown in the first post log are quite a lot better than mine, that must explain why I can't break a 5s 0-60 lol.

 

[Mr. Tech]

Mr. Tech your ignition timing shown in the first post log are quite a lot better than mine, that must explain why I can't break a 5s 0-60 lol.

Oof, sounds like we're in a similar boat. What are your mods and octane?

 

[Revvdmedia]

Oof, sounds like we're in a similar boat. What are your mods and octane?

AWD, Limited (basically GT2) so full weight. Mods are DIY intakes and and JB4 no fuel wires. Most runs were Map 2. I've played with most fuel providers out here (Husky 94, Petro 94, Shell 91 and Costco 91), never seen ignition timing as strong as the faster USA cars. A lot of us up here in Canada question the actual octane of the fuel vs. USA fuel. An octane booster would probably validate this for me, I just haven't gotten around to that yet, too busy chasing rattles.

The comments about soft launches based on the logs may apply to me too. I know our cars don't launch too hard in stock form but I feel my 1/4 mile runs were strongest in gear 3 and 4, 1 and 2 feel a bit held back, especially the launch.

I have Ecko's fuel wire "jumper" on the back end of his batch 3 so once I plug that in I can see if I find any gains in my 0-60 with the fuel wires attached.

 

[xot1]

What I learned over the few months of JB4 is:
A good log does not equal a fast car.
Logs just help diagnosis the problems if something feels wrong with the car, or give you hints on what you can improve. There are many other factors that do not show on the logs, like for example the atmospheric pressure you mentioned.

 

[brancky3]

AWD, Limited (basically GT2) so full weight. Mods are DIY intakes and and JB4 no fuel wires.

No fuel wires. /thread.

 

[Mr. Tech]

AWD, Limited (basically GT2) so full weight. Mods are DIY intakes and and JB4 no fuel wires. Most runs were Map 2. I've played with most fuel providers out here (Husky 94, Petro 94, Shell 91 and Costco 91), never seen ignition timing as strong as the faster USA cars. A lot of us up here in Canada question the actual octane of the fuel vs. USA fuel. An octane booster would probably validate this for me, I just haven't gotten around to that yet, too busy chasing rattles.

The comments about soft launches based on the logs may apply to me too. I know our cars don't launch too hard in stock form but I feel my 1/4 mile runs were strongest in gear 3 and 4, 1 and 2 feel a bit held back, especially the launch.

I have Ecko's fuel wire "jumper" on the back end of his batch 3 so once I plug that in I can see if I find any gains in my 0-60 with the fuel wires attached.

I'm guessing it's the 91 octane then, especially if I'm still having issues with US 93 haha. Try switching back to Map 0 for a bit to give your ignition timing a chance to even back out. I did that this morning and I already noticed that the car gets into boost faster. I took a look at my logs and the timing is MUCH better. That said, Map 0 is no tune, so I'll be going back to Map 1 after my next fill of shell 93. Hopefully I can get good timing on Map 1. I'll eventually try Map 2 again, but with octane booster next time.

A couple more questions, are you at a high elevation? And what do you have for tires? The limited comes with 19's and Pilot Sports, right? Or did you get the all season tires on 18's?

 

[Mr. Tech]

What I learned over the few months of JB4 is:
A good log does not equal a fast car.
Logs just help diagnosis the problems if something feels wrong with the car, or give you hints on what you can improve. There are many other factors that do not show on the logs, like for example the atmospheric pressure you mentioned.

Thanks for sharing that. I was really wondering about that so it's good to know that I can't just compare logs and expect similar results.

 

[Revvdmedia]

A couple more questions, are you at a high elevation? And what do you have for tires? The limited comes with 19's and Pilot Sports, right? Or did you get the all season tires on 18's?

I'm at about 2200ft. Not low elevation, but not mile high either. I always take that into account when looking at times, which is why I didn't consider my overall 1/4 mile time horrendously bad. I always felt my 0-60 wasn't as fast as it should be when looking at the 1/4 mile ET.

Canadian GTs all get 19's I think. 18's only on GT-Line here, we only have 3 trims plus the 20th anniversary special (top trim) which I hate the wheels on anyway lol.

 

[xot1]

It's not good to change maps back and forth.
The ECU needs time to adapt to a specific map.

 

[Mr. Tech]

It's not good to change maps back and forth.
The ECU needs time to adapt to a specific map.

I'm just doing a full restart at this point. Map 0 till timing looks perfect again, then Map 1 for a while, making sure timing still looks good, then maybe back to Map 2. I'm not changing daily if that's what you were thinking.

 

[Terry@BMS]

Hi Terry, here you go! There a second log in my previous past as well

I meant of both cars you wanted us to compare between.

 

[Mr. Tech]

Well no wonder why I can't run Map 2 on 93. Now that my ECU has had time to adjust back to Map 0, I see that, on my stock Stinger, I'm running about 12-13 pounds of boost when I go full throttle when rolling in 3rd gear and up, and anywhere from 10.5-13 peak in 1st and 2nd. Even "just" the 4 extra PSI on Map 1 would put me to a peak of 17 PSI.

How do I reduce the amount of boost per gear on Map 1? I've been looking through the app and can't seem to figure it out. Do I need to use Map 6 and manually select boost levels? I see an option for that. I'll take a look through the forums now. I'm sure someone has already explained how to do that.

I think I should try only 2 or 3 PSI first and see how my car handles that.

The snapshot below is Map 0 with just DIY intakes and regapped Denso plugs.

 

[Mr. Tech]

I think I might have found the setting. Is it the "Max Boost 1st/2nd/3rd" field? Do I enter the actual max boost or the max target?

EDIT: Took a while, but I found it in the N54 forum. I need to enter the amount of boost reduction per gear. So if I want to keep 2nd gear under 15 psi, I'd put "1" in since my stock boost for 2nd gear averages around 12 and Map 1 requests a 4 psi increase.

The name of the field in the app is incredibly misleading, though. It should be called "boost reduction".