[akayya]

Hi , I'm new jb4 user. I just installed JB4 to my car. My car has got just a jb4 and bms air intake kit. I followed the instruction and I used map2 and map3. something caught my attention in jb4 logs. If I did not misunderstood , normally boost ecu is the sum of ecu psi and target values, right? Normally the map2 maximum target value is 4 psi and the map3 maximum target value is 6 psi . I think the standard maximum boost for my car (b48 2000 cc 252 hp) is 16 psi. When I apply Map2 to my car,I think , I have to see about 20 psi maximum boost. In the log I sent you, the boost and afr values in the cells I marked with red color seem to be incompatible. Also, these weird values are only happening in map2. map3 looks more stable. By the way, I saw these strange boost values in jb4 gauge as if they were happening when I took the gas off. I'm curious about your comments.

[Steve @ BMS/Fuel-It!]

Please upload the original CSV file for review.

[akayya]

Originally Posted by Steve @ BMS/Fuel-It!

Please upload the original CSV file for review.

ok.

[Steve @ BMS/Fuel-It!]

Both times you've uploaded a zip file.

[akayya]

Originally Posted by Steve @ BMS/Fuel-It!

Both times you've uploaded a zip file.

sorry about that.

[akayya]

??

[akayya]

[Cannon @ BMS]

Please upload a log from 2k rpm to redline from 3rd or 4th gear on a safe private track. No need to upload a bunch of random logs/pulls. Thanks!

[Steve @ BMS/Fuel-It!]

Agreed, need a better log but so far it looks pretty normal.

How about a proper log on map 4?

[akayya]

Originally Posted by Cannon @ BMS

Please upload a log from 2k rpm to redline from 3rd or 4th gear on a safe private track. No need to upload a bunch of random logs/pulls. Thanks!

Finally I found time to get a properly log that you want. I uploaded 3 map log (map1,map2,map3). I wait your comments ?

Thanks.
Best regards..

[akayya]

Originally Posted by Steve @ BMS/Fuel-It!

Agreed, need a better log but so far it looks pretty normal.

How about a proper log on map 4?

I understood map1, map2 and map3. All 3 maps add additional pressure on top of the standard pressure. Frankly, I couldn't understand what exactly map4 does. Can I try map4 without hesitation?

Do you mind if you explain how Map4 works?

Thanks

Best Regards

[Cannon @ BMS]

Map 3 looks healthy. Map 4 is what is called an "absolute target" map. The difference between maps 1/2/3 and maps 4/5 is that 1/2/3 adds to the stock/factory boost targets whereas absolute maps are designated boost targets by themselves.
For example: as of right now, in map 3, you are hitting a peak boost of about 17.5-17.9 psi. Now if you were to change to map 4, you would then start targeting 20 psi.
If you are looking for a bit more power, try adding in 3 gallons of E85 on your next fill up and try map 4.
(The E85 will help keep timing from getting bad)

[akayya]

Originally Posted by Cannon @ BMS

Map 3 looks healthy. Map 4 is what is called an "absolute target" map. The difference between maps 1/2/3 and maps 4/5 is that 1/2/3 adds to the stock/factory boost targets whereas absolute maps are designated boost targets by themselves.
For example: as of right now, in map 3, you are hitting a peak boost of about 17.5-17.9 psi. Now if you were to change to map 4, you would then start targeting 20 psi.
If you are looking for a bit more power, try adding in 3 gallons of E85 on your next fill up and try map 4.
(The E85 will help keep timing from getting bad)

I understand what map4 does. I will try map4.

Something caught my attention in the old records. There is a serious difference between the ecu_psi value seen in the old logs and the logs I sent you yesterday. As a matter of course I also felt that the acceleration of the car was lower. Why might the ecu_psi value be lower than before. Do you have any comment?

Thanks..

[Cannon @ BMS]

Please stick to one map per log. Map 4 looks good. ecu_psi might have been lower if the ecu recognized that boost was higher than it should be and then tried to lower the boost itself. You won't run into those issues on map 4 and 5 since it's they are absolute maps.

[Steve @ BMS/Fuel-It!]

Its not uncommon for ECU to adjust boost based on a variety of factors. Map 4 with the absolute target resolves that issue.

[akayya]

Originally Posted by Cannon @ BMS

Please stick to one map per log. Map 4 looks good. ecu_psi might have been lower if the ecu recognized that boost was higher than it should be and then tried to lower the boost itself. You won't run into those issues on map 4 and 5 since it's they are absolute maps.

Hi again,
Finally, I tried map 4. There is no E10 or E85 derivative fuel where I live. It has only 95 octane gasoline. So I used an octane booster and tried map4. Based on your comment I could buy pure ethanol and put about 10 liters of ethanol in my full tank. When looking at the log, please look at lines after line 169. Earlier I was going into the rev breaker while testing in 3rd gear. So the values can be nonsense

If I have the opportunity in terms of time, the down pipe (catted ) will be installed this weekend. I don't want the smell of gasoline and exhaust noise. More importantly, I don't want to lose power at lower revs.

If there is no problem with map4 in the log I uploaded now, according to your comments, I can log into map4 again after the down pipe

[Steve @ BMS/Fuel-It!]

Map 4 looks good....give her a go with the new DP. I'd also just stick with the fuel and octane booster you're running. Your trims are fairly high so adding ethanol will only make that worse.

[akayya]

Originally Posted by Steve @ BMS/Fuel-It!

Map 4 looks good....give her a go with the new DP. I'd also just stick with the fuel and octane booster you're running. Your trims are fairly high so adding ethanol will only make that worse.

I did not understand exactly, if I add ethanol ,will my trims values make that worse ? you said that my trims values seems good ,right ?

[VipinLJ]

Originally Posted by akayya

I did not understand exactly, if I add ethanol ,will my trims values make that worse ? you said that my trims values seems good ,right ?

Right now it looks good, though high. Adding ethanol will increase it and force you lean.

[akayya]

Can you explain what the trim values seen in the logs are? For example, what should be the trim values for B48 engines? Which values are risky? As far as I researched, trim values are evaluated together with AFR, right? For example, can you give an example that "when accelerating at full throttle, if the trim value exceeds 50 and the afr value is around 14, it is risky"

[Steve @ BMS/Fuel-It!]

More information can be found here...

Logging Parameters and their Meaning - N54Tech.com - International Turbo Racing Discussion

[akayya]

Originally Posted by Steve @ BMS/Fuel-It!

More information can be found here...

Logging Parameters and their Meaning - N54Tech.com - International Turbo Racing Discussion

Thanks Steve..

[akayya]

Originally Posted by Steve @ BMS/Fuel-It!

Map 4 looks good....give her a go with the new DP. I'd also just stick with the fuel and octane booster you're running. Your trims are fairly high so adding ethanol will only make that worse.

Hi again,
Finally I applied ******* DP. I send you my map4 logs.(Also map2 and map3 ) In my opinion ,my wgdc ,trims ,boost(more stabile) and ignition1 values dropped more positively after DP. However, the ignition values confused me (especially ignition 1,3,5,6). Are there any anomalies in these values with each other ?

I'm curious about your expert opinions about map4 with DP.

Best regards...

[akayya]

????

[Cannon @ BMS]

Log looks healthy.