[Taskmaster]

Originally Posted by mecbain

From my understanding it was supposed to end up being opened anyway, so we can make each of us our own custom tune from their basic tune file no?

That was the idea.

[hassmaschine]

I just found the thread that originated the OFT. post away.

[LaCross]

Guys, I'm not comfortable releasing Vishnu's maps out to the public. My map is not exactly as OTS as the n54/n55 ones are.

But I will tell you that the 5c71e (intake valve setpoint) map is altered in my tune. It is gradually more aggressive than stock, but does not feature the 330i higher lift earlier in the rev range.

People are questioning whether it can do this or whether it can do that, so let me explain something. The Vishnu OFT is used for downloading your stock .bin file, and uploading your tuned one. If you can change it in the .bin file, you can load it into your car.

All you need is knowledge of how the maps work and what effects it has on the vehicle. I can change anything from valve lift to throttle while the car is warming up the cats.

Anything that AA or Evolve, ect can do, can be done with the OFT. I could take an AA .bin file and flash it to my car with my OFT, if I really wanted to

[hassmaschine]

That was the point i was trying to make in the OFT thread when everyone said it was impossible to make your own tune. lol

Looking to take my car for a baseline soon.. then the fun begins!

[Taskmaster]

Originally Posted by LaCross

Guys, I'm not comfortable releasing Vishnu's maps out to the public. My map is not exactly as OTS as the n54/n55 ones are.

But I will tell you that the 5c71e (intake valve setpoint) map is altered in my tune. It is gradually more aggressive than stock, but does not feature the 330i higher lift earlier in the rev range.

People are questioning whether it can do this or whether it can do that, so let me explain something. The Vishnu OFT is used for downloading your stock .bin file, and uploading your tuned one. If you can change it in the .bin file, you can load it into your car.

All you need is knowledge of how the maps work and what effects it has on the vehicle. I can change anything from valve lift to throttle while the car is warming up the cats.

Anything that AA or Evolve, ect can do, can be done with the OFT. I could take an AA .bin file and flash it to my car with my OFT, if I really wanted to

So it's not altered. Got it.

[hassmaschine]

It doesn't matter. I'm not going to alter anything without being able to see exactly what effect it has.

[KingofKingz]

Originally Posted by mecbain

From my understanding it was supposed to end up being opened anyway, so we can make each of us our own custom tune from their basic tune file no?

Exactly. I was expecting Shiv to give us these kind of insights instead of hassmaschine.
And I am astonished that it seems that a 330i produces more power than a tuned 325i by Vishnu. Could that be true?

btw, really interesting thread Subscribed

[e90pilot]

Originally Posted by KingofKingz

Exactly. I was expecting Shiv to give us these kind of insights instead of hassmaschine.
And I am astonished that it seems that a 330i produces more power than a tuned 325i by Vishnu. Could that be true?

btw, really interesting thread Subscribed

Yes it true. It's something that's been elusive for 325 guys even with a 3-stage manifold.

[KingofKingz]

Strange, as my car produces more torque and more power than a 330i and I have a better acceleration (5.7sec vs 6.0sec 0-100km/h)....

[hassmaschine]

isn't the 330i exhaust slightly different too?

there's so many factors, maps and curves that are different between the two, it's not that surprising. I really doubt many of the tuners have dug too deep considering the big gains and money are in the N54/N55 tunes.

[KingofKingz]

Yes, the 325i exhaust is much more restrictive than the 330i's
I can search for backpressure values, I know i have these lying around somewhere....

[Mike.]

Originally Posted by hassmaschine

isn't the 330i exhaust slightly different too?

there's so many factors, maps and curves that are different between the two, it's not that surprising. I really doubt many of the tuners have dug too deep considering the big gains and money are in the N54/N55 tunes.

well that's where you come in

[hassmaschine]

Originally Posted by KingofKingz

Yes, the 325i exhaust is much more restrictive than the 330i's
I can search for backpressure values, I know i have these lying around somewhere....

there are factors for backpressure I think as well. I should compare them.. too bad I'm working 70 hours this week.

I believe it's possible to flash the entire 330i file over to a 325i (making sure to leave the original 4kb eprom) but that might not be a good idea if there are physical differences like the exhaust. I want to test that theory on my spare DME by using the original test donor bin with my 4kb eprom. I'm thinking all the VIN/ISN data is stored there.

[e90pilot]

Originally Posted by hassmaschine

there are factors for backpressure I think as well. I should compare them.. too bad I'm working 70 hours this week.

I believe it's possible to flash the entire 330i file over to a 325i (making sure to leave the original 4kb eprom) but that might not be a good idea if there are physical differences like the exhaust. I want to test that theory on my spare DME by using the original test donor bin with my 4kb eprom. I'm thinking all the VIN/ISN data is stored there.

I've checked the part nunbers and only the muffler is different. I have the Dinan exhaust which also works for the 330i. The stock 325 exhaust isn't too restrictive. People are removing the muffler entirely with no check engine light. The primary and secondary cats are the bottleneck.

[Taskmaster]

Just checked realoem:
The 328i uses a different exhaust manifold from the 128i and 325i/330i
The 128i uses the same exhaust manifold as the 328xi, but again not the 325i/330i
The 330i uses the same exhaust manifold as the 323i/325i
The 330xi uses the same exhaust manifold as the 325xi

N51 cars have a different exhaust manifold and different down stream catalyst, shared between the 128i and 328i.

The bottleneck has to be the software, and for all N52 powered cars - headers.

[BudVlad]

Originally Posted by hassmaschine

I believe it's possible to flash the entire 330i file over to a 325i (making sure to leave the original 4kb eprom) but that might not be a good idea if there are physical differences like the exhaust. I want to test that theory on my spare DME by using the original test donor bin with my 4kb eprom. I'm thinking all the VIN/ISN data is stored there.

It’s possible but from my experience it doesn’t work. I bought 325i because I didn’t want to pay for 330i parts which I was going to replace anyway (exhaust, brakes, diff). After flash with 330i software and 330i intake manifold car was running but with much less power. I had to go back to 325i software and had it modified by DS Motorsport in Germany.

[bimmerquick43321]

Originally Posted by KingofKingz

Strange, as my car produces more torque and more power than a 330i and I have a better acceleration (5.7sec vs 6.0sec 0-100km/h)....

gearing/exhaust/etc... are some of the other differences, and probably some others that I have no idea about...

however I would still think that a full bolton 325i to be faster than a stock 330i, however just adding the 3 stage intake manifold with a tune is probably not going to do it...

[Taskmaster]

Originally Posted by mecbain

gearing/exhaust/etc... are some of the other differences, and probably some others that I have no idea about...

however I would still think that a full bolton 325i to be faster than a stock 330i, however just adding the 3 stage intake manifold with a tune is probably not going to do it...

With the right tuner it is.

[e90pilot]

Originally Posted by TheAxiom

With the right tuner it is.

I'm fairly confident you're correct. I've done some pretty extensive research on the physical differences between 325 and 330 engines. They are IDENTICAL. Same part numbers for everything including long block, head, ECU. The only differences are the muffler and and intake manifold. I'm not sure about the software because I haven't looked into it. I know the software is extremely complicated and that there is a difference between the two cars. What we've seen here is just one table. There are hundreds more for all sorts of things.

BudVlad, you have an N53 so I can't comment on that.

[hassmaschine]

Not hundreds. Thousands!

[hassmaschine]

toyed with valve lift a bit. there's also a full load (vollast) map of course. I found the factor for maxiumum lift (10mm). I set the VL map to 10mm from 9.7, can't say I can tell any difference, but I'm not surprised. it's only maybe 3% increase at most. I'll reset it to stock before getting a base line.

I also tweaked the torque scaling factor for torque reduction requests via CAN (aka, traction control). basically it's a scaling factor, so if the ABS system requests a 50% reduction in torque, it multiplies that by the scaling factor and that's what it uses to reduce the actual torque output (this is way simplified but you get the idea).

stock was set to 400nm, I started with 200nm. coming from a car without any form of traction control, I found it to be pretty annoying and maybe even a little dangerous. I might play with it further but at half of what it was before, it seems much better - enough for a bit of safety factor, but not so much that it feels like somebody put the car in neutral. it would give me a little bit of wheelspin without letting it get out of control. too bad the car doesn't have LSD..

I set the fuel cut additive factor to 0 to see what happens. it still hits the spark retard first, basically can't tell any difference from stock.. there's a bunch of constants for disabling spark retard, I'll just have to try them and see if I can make the rev limit fuel cut only.

so far the only change that's really improved anything is the torque scaling factor, but there's still a lot to learn!

[e90pilot]

Some pretty cool stuff! I have a small request if you can entertain it. I'm not sure if anyone else has experienced this, but the car has a "soft lift" feature that is actually quite irritating. Basically the car will close the throttle slowly to smooth out the driver input. While there's a turning force, the effect is amplified. I actually find it dangerous. If the car is understeering and I lift to get the front to grip, it won't let me. In fact it keeps accelerating sometimes. If you can find that table, that alone would make my day.