Stock i AFM Handle Boost?

[Bullhead]

I am going to get my 2.7i project under way and was wondering if the AFM from the 325i can handle the boost and be programed accordingly or do I have to go another route?

[Regnar75]

I don't think you can get AFM or motronic to register boost. I believe all you can do is monitor a/f ratio and adjust the fuel with a rrfpr or something. The AFM doesn't measure mass of air. Then again I have never done any tuning to try and make the change. Most people either accept that motronic will not register boost and adjust fuel manually or go aftermarket management and delete the AFM anyway. Someone else chime in

[Bullhead]

I am in the same train of thought. I will prob holler at sssquid and see if he offers a compatible boost chip for the 2.7i setup boosted. I am sure he will need specifics such as the current a/f ratio and the psi being utilized.

[efficient]

Why not just spend the money on mega squirt

[TheTacoMan]

It could be done, but its a rudimentary way that takes alot of time to get right. The issue with the stock management system is that it has no way of sensing boost or vacuum. Go with Ms.

[Regnar75]

there are some people out there that will stand by the motronic turbo setup, while it doesnt offer all the cool tuning abilities it is proven to work. and based on budgets is still a viable option.

[Bullhead]

I understand you guys saying go with mega squirt, but that's a very expensive option. I don't have $800 to throw at a stand alone fuel management system. And if it can be done with a stock setup and put that $ somewhere else, why not?

[LowR3V'in]

stock air meter will not know boost.
Only reason u need to adjust is because of using bigger injectors will have
a terrible AFR if not done.

You need a begi to control fuel pressure when boost hits.
It's a fuel pressure regulator.


That's a freaking joke. Like it's 1998
Megasquirt is thousands of times a better
value.

Price out a chip and begi post back.

[TheTacoMan]

I understand you guys saying go with mega squirt, but that's a very expensive option. I don't have $800 to throw at a stand alone fuel management system. And if it can be done with a stock setup and put that $ somewhere else, why not?

You really should not turbo then, There was a guy on here that did a budget junkyard build but it was far from ideal, on a rusted e30. If you cant afford ms, then how do expect to afford a decent turbo, injectors, the custom exhuast, paying someone to tune the monotronic system, and not to mention the need to for a stronger clutch?

[LowR3V'in]

You'd be quite inept to pay someone for tuning.
Begi a super EZ thing to tune.

Begi is fine.
Reliable, meant for low boost, no real tuning, but price it out.
Not allot cheaper then megasquirt.

[Regnar75]

http://www.r3vlimited.com/board/showthread.php?t=202653

seems to be most popular MS option on r3v. $650
wideband o2 - 150ish
turbo manifold (ebay) 150
tubing and intercooler (cheapest i found was ebay) 150
turbo (wide range depending on brand) lets say 250-350 ?
custom exhaust work - 300 (probably, depending on shop)
Injectors (85-150) depending
tuner programs (free unless you register then like 39$ i believe)
dyno tuning (local rate is 200 first hour, 150 after)
ARP head studs (200ish) or metric blue (4$ each i think)
cheap knockoff BOV $50
new clutch if going over 250hp ($300)
decent computer to tune with (wont include in cost, most have one...not me tho)
= $2650+-
obviously an EXTREMELY rough estimate.

so far my parts

Begi RRFPR $115 shipped
Garrett Aireasearch t3 - Free (yea not a good example for pricing)
30lb rebuilt/flowed injectors $85 shipped
ebay manifold 150
ebay intercooler/piping 150
metric blue bolts ($4per)
turbo chip (probably go SSSquid because hes a good guy 230) (ebay 50$)
exhaust work -$300
Wideband $150
BOV $50
M30 AFM 50$ shipped
stock clutch because this setup is low boost and power goals are under 250
=$1250 Rough

im sure both can be had for less depending if you shop around. but i feel like if your goal is to turbo for cheap/low PSI/low HP, 650 for management is a lot. if your looking to build a 350+ HP car, yea management is key, as well as things like ARP studs, or even Cometic HG. as soon as you get into the higher PSI area i can see budget being bad, and also it being even more important to rebuild the engine you already have (rings especially) but to run 8psi on the m20, i think that low of a psi is well within the safe range capable of a budget build, while obviously not the best setup. as long as A/F ratio is good throughout the powerband, and your not at the limits of your setup what is really wrong with the budget nonMS setup? and i ask that as a question to get some more info.

[Bullhead]

It's not that I can't afford it, I never said I couldn't afford it. I just said I didn't want to, just because someone doesn't want to blow a wad of greenbacks on a MS doesn't mean they are a broke. I am just trying to think along the lines of budget while repairing everything else the cars needs to. Again I was just asking if it would work, and if it's not ideal that's ok lol. I will turn back to the m30 swap for N/A power then.

[ForcedFirebird]

You really should not turbo then, There was a guy on here that did a budget junkyard build but it was far from ideal, on a rusted e30. If you cant afford ms, then how do expect to afford a decent turbo, injectors, the custom exhuast, paying someone to tune the monotronic system, and not to mention the need to for a stronger clutch?

Ummm, I tuned that car, and it ran very well at that. Re-mapped the chip to accept 30lb/hr injectors, idled perfect in the 14's AFR's, and was a steady 12.5 under boost.

The Motronic is the very same system that Porsche used in the 944 turbo cars. As long as there's someone competent behind the chip writing, Motronic is fine. No need to clock the AFM, no need for a RRFPR etc.

No, it's not for everyone, but M1.3 is plenty capable. Just get an Ostrich 2.0 emulator and TunerPro RT - cost ya $175.

[Bullhead]

Ummm, I tuned that car, and it ran very well at that. Re-mapped the chip to accept 30lb/hr injectors, idled perfect in the 14's AFR's, and was a steady 12.5 under boost.

The Motronic is the very same system that Porsche used in the 944 turbo cars. As long as there's someone competent behind the chip writing, Motronic is fine. No need to clock the AFM, no need for a RRFPR etc.

No, it's not for everyone, but M1.3 is plenty capable. Just get an Ostrich 2.0 emulator and TunerPro RT - cost ya $175.

That's what I was looking for, thank you sir. I will hit you up when I get it figured out on what's going where FF.

I would also like to state that I have nothing against the MS system, as it is outstanding. I just have a lot going on with the car and was looking to at least have some fun while repairing everything that has been neglected.

[Bullhead]

You really should not turbo then, There was a guy on here that did a budget junkyard build but it was far from ideal, on a rusted e30. If you cant afford ms, then how do expect to afford a decent turbo, injectors, the custom exhuast, paying someone to tune the monotronic system, and not to mention the need to for a stronger clutch?

I have an HX-35 in the shed, and I will fab my own exhaust and I am going to have FF map me a chip.