M30 Dyno Graphs

[stoney85]

thats the thing that fools most people, using different dynos and comparing results just doesn't work, you should always use the same dyno if you want to compare before and after results

I have access to a Mainline AWD dyno at a mates workshop, so i will do a before and after run with a basic EBAY chip to see if the AFR's are fine and what not, and also a power run for comparison - sadly its auto (for now)

[Stir Fry A Lot]

Might as well add mine. This is with a Gen III maf, 22lb Design III injectors and a reprogrammable Miller WAR chip. The pulls were done in fourth gear and was running syn mobil 15w-50. My engine is healthy and expected to put down higher numbers but it is what it is.

peaks

afr

conditions

[T444E]

What's a B35 rated brand new?

[Stir Fry A Lot]

I've seen 208, 211 and 218. I think I've seen 208 the most often though.

[T444E]

I wonder what a brand new 535/5 put down to the wheels in 1990. 180? 190?

[E34nication]

I would guess around 175whp... maybe 180 tops.

[T444E]

33hp loss in the drive train? Wow.

[E34nication]

starting with 208 horsepower at the flywheel a 15% drivetrain loss puts it at 176.8.

[T444E]

Is 15% for rwd? Would it be 15% for AWD too?

[E34nication]

12-15% for a manual tranny seems to be pretty standard... awd cars tend to lose a little more from what I've seen but all of this is really guessing. Every car is different... every dyno is different. 1/4 mile trap speeds are more indicative of power as far as I'm concerned.

[xatlas0]

Might as well add mine. This is with a Gen III maf, 22lb Design III injectors and a reprogrammable Miller WAR chip. The pulls were done in fourth gear and was running syn mobil 15w-50. My engine is healthy and expected to put down higher numbers but it is what it is.

afr

Your AFRs need some work. That could be where the problem is.

[Stir Fry A Lot]

Your AFRs need some work. That could be where the problem is.

Would you say its due to a TPS issue or could it be sorted by further tuning?

[janders211]

Is 15% for rwd? Would it be 15% for AWD too?

15-18% is standard for most manual RWD transmissions (on any car), 20-25% has been seen with automatics. For comparison e34 540is stock show 250rwhp with manuals, and 230rwhp with automatics.

AWD experiences even more loss due to drivetrain mass, and simply put- more fluids, and more things spinning in them. The exact loss is hard to compare because AWD cars are generally dynoed on AWD dynos

[xatlas0]

Would you say its due to a TPS issue or could it be sorted by further tuning?

Your min AFR is ~13. Peak power is usually generated at about 12.1 for a NA engine going WOT (going by memory) so some additional tuning would be a good idea.

[stoney85]

If you want to get technical, peak power is at 14.7:1 - the stoic value, however it becomes unsafe and potentially can lean out the motor, esp on an older design with less control over AFR's like the M30 has, hence why the AFR's are higher.

Dont get me wrong, most peak power figures are in the 12:1, but in a perfect world it should be 14.7:1, but factors like uneven cylinder filling, position of the o2 sensor, etc lead to incorrect readings

I've been reading a bit lately about tuners who are running the cars in the high 13:1's and low 14:1s, now they have the ability to monitor so much more, like cylinder head temp, egt, individual o2 sensors per cylinder, knock sensors and so on, plus a computer that has the ability to basically run each cylinder seperately from each other, to maximise potential, all this after precision machine work and extrude honing etc on the parts to get as even flow per cylinder as possible, and much more

But thats a different kettle of fish all together

[Stir Fry A Lot]

Do you think my afr is funky enough to justify bringing it in for a second run?

[xatlas0]

Since you have the WAR chip, why not give it a shot yourself? Grab a wideband, a friend, and a nice, abandoned stretch of road. Use the good ol' butt dyno to get a feel for it. Just watch your lean conditions to make sure you don't blow anything, and keep an eye on your cats to make sure you don't cook them with too much fuel. Most of the turbo DIY tuners use a system like this, based on my understanding.

[Stir Fry A Lot]

Yeah, my friend was telling me about diy tuning but in the Bay Area there are zero places to wind out the engine. I'd really have to venture to the sticks to do this and I have a lot of responsibilities right now so venturing far away to have a little fun is out of the question.

[PetesHelga]

I will dyno my 535i with similar mods in spring and I will be sure to post numbers for you then. I'm going to dyno it on Miller's mustang dyno.

[FrederikC]

Euro M30B30 730i manual with VEMS ECU and T3 / T4 turbo. On low grade fuel

I've plotted N/A figures in, they were achieved with the car running a MS2 ECU instead of the old Motronic AFR system. All values are at the flywheel.

[floridaheat]

Just FYI don't compare between the graphs as they are running different dynos at different locations and different temps.

[FrederikC]

To clarify, my N/A and FI where done on the same dyno, but different days - and the N/A setup was on better fuel.