[DiyTransport]

I have a pure turbo stage 2 inter cooler car delete pretty much all the normal for about 10 was expecting 550 hp and not getting anywhere near that ...I'm running a bootmod3 stg 2 e30 ots map. I'm only seeing 430ish hp and seems to be coming on late? Here is my data

http://www.bootmod3.net/log?id=5c3158c4ae729b4426df1972

Love some help tuning it to hit 500 plus and a lot quicker

[SeanWRT]

Actually, not bad for the E30 OTS. One question - did you actually use E30 fuel? The log doesn't seem to be that way.

A few months back, one of my friend dynoed his M2 on PS2 and pretty much the same supporting mods as yours on OTS 93OCT map and got only 400+whp (many pulls) from a conservatively reading dynojet. I posted the dynograph on my turbo thread if you want to check.

For 20-30hp more power, a map with more boost to take advantage of your bigger turbo is all you need and a 3.5bar sensor. For now.

If you're really shooting 500 on wheel - let me tell you straight - these two things are absolutely required 1)Meth and 2)JB4. There are no N55 PS2 seeing 500+ without them.

With JB4, you can target 22psi across and use the normal OTS STG2 pump gas map for BEF (E30 map would be too high timing for your high boost). A STG2 LPFP is also helpful, but not necessary though with the meth in place.

If you want a maxed out 24-25psi with E40-50, then the meth alone wouldn't be enough fueling and octane, therefore, HPFP upgrade or PI, and lpfp are required.

Good luck man!

[M2guru]

SeanWRT So...now I am confused...with BM3 aren't you able to customized your own tune or do you have to use a map and that's the reason for needing JB4? The PTF website isn't clear to me (at least I couldn't find anything helpful).

[cecaa850]

Originally Posted by M2guru

SeanWRT So...now I am confused...with BM3 aren't you able to customized your own tune or do you have to use a map and that's the reason for needing JB4? The PTF website isn't clear to me (at least I couldn't find anything helpful).

Good question. I've also heard of people using JB4 with BM3.

This may have been covered previously but strictly from a performance standpoint (I don't really care about customization) is there an advantage of one over the other (JB4 vs BM3)?

[PackPride85]

I'm guessing the jb4 is for meth control?

[cecaa850]

Originally Posted by PackPride85

I'm guessing the jb4 is for meth control?

I believe it is a piggy back controller but I'd really like to know the difference. There was a thread comparing the two at one time but I can't seem to find it.

[PackPride85]

Originally Posted by cecaa850

I believe it is a piggy back controller but I'd really like to know the difference. There was a thread comparing the two at one time but I can't seem to find it.

It is a piggy back. I think the question was why you would need both BM3 and JB4. I think that is due to Beth control being done via the JB4 and the regular tune using bm3.

[cecaa850]

This is the thread I was thinking of.

https://f80.bimmerpost.com/forums/sh....php?t=1562567

[mike@x-ph.com]

Pros of running JB4 with bootmod:
On the fly map changes from the turn signal or phone app including
stock, VALET, pump gas, E85, water/meth, and race gas maps
Exhaust flap control via turn signal

[SeanWRT]

Originally Posted by M2guru

SeanWRT So...now I am confused...with BM3 aren't you able to customized your own tune or do you have to use a map and that's the reason for needing JB4? The PTF website isn't clear to me (at least I couldn't find anything helpful).

It's a different story when you flash tune to 22+psi, than when you tune to 18. A lot more restrictions from stock map need to be correctly unlocked which is no easy. JB4 works in a deceptive way where DME don't see real boost, so these high boost restriction can be circumvented.

In addition, power is primarily dictated by boost. To fully control power, the boost based tuning tool (JB4) is much easier - just need to make sure octane and fueling is there and a good BEF with optimal timing and AFR.

With the load based flash only tuning, boost control never override load. DME would call out whatever is appropriate (in its logic) to achieve the torque request, sometimes boost/timing will be out of place. A side note - I often get asked how much boost I'm running and found it really difficult to answer. Because the same map targets 19psi in summer on track and 16 on the coolest day of winter, and guess what, makes the similar power (at least in theory). That wouldn't happen with JB4.

Doing 24~25psi with flash only is ultimately possible. (Though one may be asking: 25psi in winter or in summer LOL, very very different). But the thing is - no tuner will be committed with you to that mission when JB4 is so easy out there.

At the end of the day, what's the point of flash only? The drivability, reliability and consistency. Do you even expect to have any of them at all with that kind of boost with N55? So there is that.

[PackPride85]

Flash based boost tuning is possible, it just has to be developed. I ran that for a bit on my Mazda using Cobb. For a stock turbo fbo car I found the power inconsistencies very noticeable to the point where i was running a different map for each season. Ended up going back to load tune. The big turbo guys seemed to like the boost tuning though.

[cecaa850]

So if I'm reading correctly, BM3 is a load based tune?

[PackPride85]

Originally Posted by cecaa850

So if I'm reading correctly, BM3 is a load based tune?

Yes. Calculated load is how the ecu effectively measures torque. It's goal is to hit the same load/torque in all environment conditions.

Most turbo charged cars in the last 10 years or so have switched to load based tunes. Some flash tuners (Cobb) have been able to flash boost based tuning maps however depending on the car.