[JBA87]

Here are some comparative logs for map 0, map 1 and map 2 that I did a few days ago
Map 0 obviously at stock boos
Map 1 at about 20-23 psi
Map 2 at about 25 psi +

Alll on most updated firmware

[JBA87]

One other map 2

[onfireX5]

I’m repeating the obvious, but 5 degrees of timing is destroying your power. Terry should be able to help there. If you have 100 octane Shell or Sunoco nearby, it would be a great test.

[gpdriver17]

I replied to you in email about this. But just wanted to add here, with the timing being pulled that much, you're likely putting your engine at risk running 93 octane with that much boost. DME is good, but your issue now is with fuel. As far as the car short shifting, it shouldn't matter much. Usually boost falls off near the redline, short shifting a little may be faster.

Also your 0-40 times are on par with my 2.70 runs. All your lost time is 40-60 mph. So the launch, power down low and traction aren't the bottleneck now. 40-60 is slower because your timing is super low which reduces the power.

[JBA87]

Point taken but my timing doesn't look much different on map 1 or map 0 if timing is being measured by the ign1 variable?

Am I missing something ?

[limeypride]

Agreed on the timing aspects below--very likely it though your fuel should be good enough for both maps 1 and 2 so I'm still confused. Pursue this with Terry...

Trying another tack: focus on shifts for a second: think about the shifts when you're driving it hard but NOT from a launch, you'll feel a distinct gap in forward propulsion (it's short, less than a half second... but it's obviously there; no DCT afterall)--agreed?

When you perform a full-fat Launch Control launch (i.e. the flag comes up saying Launch enabled or whatever the heck it is it says), do the shifts feel the same or does it feel almost like the car magically engages the next gear without disengaging the current one--like it convulses from one to the next with no loss in propulsion? If you don't know what I'm describing in the latter part then we may have identified the problem.

[JBA87]

Launch control feels like it shoots me forward when it shifts gears .. like this it shifts and the car picks up g's and lunges forward


Maybe describe what your trying to describe a little differently and I'll try and take note next time i drive

[JBA87]

This gas is really close :

https://www.sunocoracefuels.com/fuel/260-gt

There is a station 5 miles away

Good? Lol

[Hockeytyme]

Originally Posted by gpdriver17

I replied to you in email about this. But just wanted to add here, with the timing being pulled that much, you're likely putting your engine at risk running 93 octane with that much boost. DME is good, but your issue now is with fuel. As far as the car short shifting, it shouldn't matter much. Usually boost falls off near the redline, short shifting a little may be faster.

Also your 0-40 times are on par with my 2.70 runs. All your lost time is 40-60 mph. So the launch, power down low and traction aren't the bottleneck now. 40-60 is slower because your timing is super low which reduces the power.

Originally Posted by limeypride

Agreed on the timing aspects below--very likely it though your fuel should be good enough for both maps 1 and 2 so I'm still confused. Pursue this with Terry...

Trying another tack: focus on shifts for a second: think about the shifts when you're driving it hard but NOT from a launch, you'll feel a distinct gap in forward propulsion (it's short, less than a half second... but it's obviously there; no DCT afterall)--agreed?

When you perform a full-fat Launch Control launch (i.e. the flag comes up saying Launch enabled or whatever the heck it is it says), do the shifts feel the same or does it feel almost like the car magically engages the next gear without disengaging the current one--like it convulses from one to the next with no loss in propulsion? If you don't know what I'm describing in the latter part then we may have identified the problem.

I agree with you both. I would send logs to Terry and ask him what his opinion is on the fuel. I'm with gpdriver though on the fuel. I personally wouldn't run map2 on 93 octane. I wouldn't feel comfortable. Even 2-3 gallons of E85 or MS101 would suffice or go Limeys route and use some octane booster

[Hockeytyme]

Originally Posted by JBA87

This gas is really close :

https://www.sunocoracefuels.com/fuel/260-gt

There is a station 5 miles away

Good? Lol

260gt is equal to MS100. 5-10 gallons of that and the rest 93 and you would be good to go for a daily map2 and feel safer.

[limeypride]

Originally Posted by JBA87

Launch control feels like it shoots me forward when it shifts gears .. like this it shifts and the car picks up g's and lunges forward


Maybe describe what your trying to describe a little differently and I'll try and take note next time i drive

Lunges:convulses... we're on the same page —> it's using something ZF call QS3 shifting as it should during launch so you're good on that front.

I have nothing else to add I'm afraid. Timing and Terry are your path forward I think.

[BMWDriverX]

91oct and 3 gallons of E85 i can run no higher than map 2 correct? What about adding say 5 gallons of 100oct to the already mixed 91oct and 3 gallons of E85? Can I use map 3 on that setup or just go straight 100oct?

[Hockeytyme]

Originally Posted by BMWDriverX

91oct and 3 gallons of E85 i can run no higher than map 2 correct? What about adding say 5 gallons of 100oct to the already mixed 91oct and 3 gallons of E85? Can I use map 3 on that setup or just go straight 100oct?

I didn't have better results using map3 over map2. But, if it were me I would go straight MS101 or MS109 for anything over map2

[gpdriver17]

Originally Posted by Hockeytyme

I didn't have better results using map3 over map2. But, if it were me I would go straight MS101 or MS109 for anything over map2

Agreed. How much boost are you guys pulling on Map 2? If I remember right Hockeytyme was around 22psi average. I'm at 19.5psi average. I wouldn't run pump gas with anything over 22psi, even that is kind of pushing it.

JBA87 Holy shit... I just looked at the Map 6 logs you sent me. That is WAY too much boost for pump gas. You are going to be the next person to blow their engine if you run that on pump gas. Boost was in the 26-28 range, touching 30 in a few spots. TBH You may already have some engine damage from that.

[JBA87]

It's not map 6

It's map 2!!!!

[JBA87]

I switched back to map 1 this morning

[JBA87]

And now u have me nervous

[gpdriver17]

JBA87 Sorry, my bad. I had someone else send me logs around the same time and clicked the wrong file. I saw it said Map 6 on one of them and that you had mentioned map 6 in this thread. Your Map 2 boost is pretty high for Map 2 though. I don't think it's high enough to do engine damage that fast though. I thought you were running close to 30psi on pump gas.

[Hockeytyme]

Originally Posted by gpdriver17

Agreed. How much boost are you guys pulling on Map 2? If I remember right Hockeytyme was around 22psi average. I'm at 19.5psi average. I wouldn't run pump gas with anything over 22psi, even that is kind of pushing it.

JBA87 Holy shit... I just looked at the Map 6 logs you sent me. That is WAY too much boost for pump gas. You are going to be the next person to blow their engine if you run that on pump gas. Boost was in the 26-28 range, touching 30 in a few spots. TBH You may already have some engine damage from that.

Map2 averages 22 or so for me but peaks at 26/27/28 at times. That's why I wont run it without at least 97 octane or higher. It's suppose to add 5.3lbs but with spikes it can go high.

I fear for guys playing with JB4. I wish it had a warning when you select maps and said "requires xx amount of octane" JB4 is powerful and a good tool but you really have to use it with caution and reading and comparing logs with the guys at BMS.

I attached an old v3 guide but we are on v5. It says 93 is okay for map2 but I wouldn't do it as you can see how much it boosts at times.

[gpdriver17]

I feel like Map 2 is still additive even though they say it's absolute. Looking at the actual boost with the ECU requested boost, actual boost is always ECU requested +~5-6psi. It follows every little drop or bump in the ECU requested exactly. If it were really absolute, it should have no correlation with the ECU requested.

[limeypride]

Originally Posted by gpdriver17

I feel like Map 2 is still additive even though they say it's absolute. Looking at the actual boost with the ECU requested boost, actual boost is always ECU requested +~5-6psi. It follows every little drop or bump in the ECU requested exactly. If it were really absolute, it should have no correlation with the ECU requested.

It is additive—he changed that behavior a year or so ago.

[Hockeytyme]

Originally Posted by gpdriver17

I feel like Map 2 is still additive even though they say it's absolute. Looking at the actual boost with the ECU requested boost, actual boost is always ECU requested +~5-6psi. It follows every little drop or bump in the ECU requested exactly. If it were really absolute, it should have no correlation with the ECU requested.

Originally Posted by limeypride

It is additive—he changed that behavior a year or so ago.

yes, it's additive. That image I posted is old