JB4 Map 1 Log

[aorizun]

Hey guys! First post here. I've had my 2021 Supra for about 3 months now and I've just installed a JB4 with EWG. The only modification it has right now is an Armaspeed CAI. These are my Map 1 logs. I don't think I'll be going higher than Map 1 or 2 but I also don't really know what the other maps do and if they're safe. I'm in Utah and I can only go up to 91 octane. These readings are on 91 octane. There are three WOT pulls from 3rd gear. Thanks to anyone that helps me out!

https://datazap.me/u/weeritn/2021-supra-jb4-stock-map-1-log?log=0&data=1-4&solo=4

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[FLtrackdays]

I got a custom tune from Jesse & it’s amazing. But I also have access to 93 octane. Or you can checkout this thread https://www.supramkv.com/threads/seeking-more-info-on-jb4-map-6-tuning.16759 - if you are a do it yourselfer. Lots of good info there

 

[ColonelAdama]

Hey guys! First post here. I've had my 2021 Supra for about 3 months now and I've just installed a JB4 with EWG. The only modification it has right now is an Armaspeed CAI. These are my Map 1 logs. I don't think I'll be going higher than Map 1 or 2 but I also don't really know what the other maps do and if they're safe. I'm in Utah and I can only go up to 91 octane. These readings are on 91 octane. There are three WOT pulls from 3rd gear. Thanks to anyone that helps me out!

https://datazap.me/u/weeritn/2021-supra-jb4-stock-map-1-log?log=0&data=1-4&solo=4

Log looks fine! Don't recommend any higher maps than map 1 if you are only on 91 octane. Few timing corrections in the log. If you have ethanol around for mixing, there are more options.

 

[aorizun]

Log looks fine! Don't recommend any higher maps than map 1 if you are only on 91 octane. Few timing corrections in the log. If you have ethanol around for mixing, there are more options.

What are the timing corrections? Is it okay to have a few of them?

I’ve been told that 91 octane in Utah should be equivalent to 93 octane elsewhere due to elevation. I don’t know how true this really holds.

Also I noticed that I had boost as high as 22 on the third pull. Is that safe?

 

[ColonelAdama]

What are the timing corrections? Is it okay to have a few of them?

I’ve been told that 91 octane in Utah should be equivalent to 93 octane elsewhere due to elevation. I don’t know how true this really holds.

Also I noticed that I had boost as high as 22 on the third pull. Is that safe?

Eh, I have never heard that before. When tuning these cars, octane and intake temps is most important for power.

22 psi was only when you finished the pull and the throttle closed. If you look at "Boost2" (manifold pressure) you can see that your engine only got 13.5 psi rather than the 22 psi that was in the charge pipe.

Yeah a few timing corrections is okay since they are less than a few degrees, but it definitely means it is limiting your power. Tells me you are octane limited, even on map 1.

 

[aorizun]

Eh, I have never heard that before. When tuning these cars, octane and intake temps is most important for power.

22 psi was only when you finished the pull and the throttle closed. If you look at "Boost2" (manifold pressure) you can see that your engine only got 13.5 psi rather than the 22 psi that was in the charge pipe.

Yeah a few timing corrections is okay since they are less than a few degrees, but it definitely means it is limiting your power. Tells me you are octane limited, even on map 1.

Gotcha. Yeah in Utah there isn't more than 91 octane anywhere. There is an E85 station somewhat near me that I could try to blend E30. With my power being limited, do you think that even Map 1 is unsafe for me? I don't want to make the car unreliable for just a bit more power.

On another note though, incase I did run E30. Would it be safe to log Map 1, 2 and 4 if I ran E30 and see if it looks good as well?

 

[ColonelAdama]

Gotcha. Yeah in Utah there isn't more than 91 octane anywhere. There is an E85 station somewhat near me that I could try to blend E30. With my power being limited, do you think that even Map 1 is unsafe for me? I don't want to make the car unreliable for just a bit more power.

On another note though, incase I did run E30. Would it be safe to log Map 1, 2 and 4 if I ran E30 and see if it looks good as well?

Nah, Map 1 is safe on 91. Car will just run less timing advance since it knows its octane limited.

If you run E30, start by posting a Map 1 log here and we go from there. Just start by putting 2 gal of E in there.

 

[aorizun]

Nah, Map 1 is safe on 91. Car will just run less timing advance since it knows its octane limited.

If you run E30, start by posting a Map 1 log here and we go from there. Just start by putting 2 gal of E in there.

Thanks a ton! I’ll most likely be staying Map 1 for a while then. I’m satisfied with the increased power while staying reliable.

When you say putting 2 gallons of E, does it matter how much 91 is already in the tank? I’m assuming it’s the 1/3 ratio.

 

[ColonelAdama]

Thanks a ton! I’ll most likely be staying Map 1 for a while then. I’m satisfied with the increased power while staying reliable.

When you say putting 2 gallons of E, does it matter how much 91 is already in the tank? I’m assuming it’s the 1/3 ratio.

Yeah, I meant 2 gallons of E in a full tank of 91. Which is like E20.

1:3 ratio is the most I would go without seeing a log, it is around e30.

 

[aorizun]

Yeah, I meant 2 gallons of E in a full tank of 91. Which is like E20.

1:3 ratio is the most I would go without seeing a log, it is around e30.

Gotcha, I’ll make sure to run that E20 Map 1 tomorrow. I’ve gotten 3 more runs in today to see if the logs are still reliable. Sorry for making you do more work, just kind of worried about how much boost it’s hitting on Map 1.

https://datazap.me/u/weeritn/2021-supra-jb4-map-1-day-2?log=0

 

[i3igpete]

ignition timing is super low in the latest log, any wheel spin?

The high boost could be due to the fact that you started in 2nd and short shifted. the dme_bt tells us that the dme WANTS 20 psi of boost

 

[aorizun]

ignition timing is super low, any wheel spin?

The high boost could be due to the fact that you started in 2nd and short shifted. the dme_bt tells us that the dme WANTS 20 psi of boost

There was some wheel spin on some of the runs yes. I believe one of them is a sport mode and when I floored it, it went to 2nd.

 

[ColonelAdama]

ignition timing is super low in the latest log, any wheel spin?

The high boost could be due to the fact that you started in 2nd and short shifted. the dme_bt tells us that the dme WANTS 20 psi of boost

There was some wheel spin on some of the runs yes. I believe one of them is a sport mode and when I floored it, it went to 2nd.

Yeah, timing is crap because the DME is requesting high boost and Map 1 is stacking more on top of that. Way too much boost for 91. We can try an absolute map instead to get that under control.

If you want to give Map 6 a shot, here are some boost targets you try that are suitable for 91 octane.

map6_15	map6_20	map6_25	map6_30	map6_35	map6_40	map6_45	map6_50	map6_55	map6_60	map6_65	map6_70
15.1​	15.1​	15.1​	16.1​	16.6​	17.1​	17.6​	18.1​	18.1​	18.1​	17.1​	16.1​

 

[aorizun]

Yeah, timing is crap because the DME is requesting high boost and Map 1 is stacking more on top of that. Way too much boost for 91. We can try an absolute map instead to get that under control.

If you want to give Map 6 a shot, here are some boost targets you try that are suitable for 91 octane.

map6_15	map6_20	map6_25	map6_30	map6_35	map6_40	map6_45	map6_50	map6_55	map6_60	map6_65	map6_70
15.1​	15.1​	15.1​	16.1​	16.6​	17.1​	17.6​	18.1​	18.1​	18.1​	17.1​	16.1​

I could try that map6 shortly. Would running that E20 blend solve the timing issue? I’d rather run Map0 on days I don’t have access to E85 and Map1 for days that I do

 

[ColonelAdama]

I could try that map6 shortly. Would running that E20 blend solve the timing issue? I’d rather run Map0 on days I don’t have access to E85 and Map1 for days that I do

Eh, this is one of those cars where sticking with absolute maps is better.

I still haven't figured out why some cars DME request such high boost and low timing. I have reviewed logs for a few cars where this was the case, and we fixed it by running absolute maps, like that Map 6.

To answer your question though - I recommend that Map 6 i just sent for 91, and just Map 4 for E20/E30.

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