I have heard this is possible with the SMT-6. I also looked into the MAP avenue as opposed to a more traditional MAF because MAP sensors are abundant and cheap from my research. What I don't know however is what steps mechanically and electronically do I need to take to convert a AFM metered car to a MAP metered car. I have scoured this wonderful forum and also many pages searched from Altavista and I couldn't really find anything useful on the subject. Any help? If converting to MAP is a huuuuge pain in the ass I could resort to MAF. Comments, suggestions?
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I have a writeup on here somewhere, search for my name.
It consists of taking various voltage measurements from your AFM at different RPMS, then using the SMT6 to condition the MAF signal into the same voltages.
The only physical tricks is getting a MAF in there, and secured.
An accurate A/F guage is REQUIRED to make this work right. If you have a 1st gen SMT6, DO NOT use the built-in O2 display. It is flawed. I am not sure if they fixed this in the newer SMT6/7. Pick yourself up an AutoMeter a/f gauge from summit. I got a really nice looking one with good resolution for about $70. You can make your own (which I have also done) for about $10 (maybe 20-25 if you have no electronic stuff to start with).
You can poke around in here too:
Michael Spiegle
'01 Ford Escape / Daily Driver
'99 M3 / Track Car
'87 325is bronzit / wtf car
'06 Daytona Triumph 675 / Daily Rider -
This sounds interesting, i would also like to do the conversion but here in the UK its common practice to use a Unichip in the ECU and that converts the signal but also the car needs a remat wich is really megga money £600 GBP so im trying to find another way of doing this so any info would be great.
the way im going to attach mines is with this little contraption which will bolt onto the AirBox and make things look nice and stock. As i hate cone/air filters they are not worth the agro, and produce little results for their capital.
Andrew AT E30zone.co.uk | H23-is | S14Comment
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Im pretty sure he meant MAP, as in a manifold absolute pressure sensor. :POriginally posted by mspiegleJames Peacock
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Demlotcrew.....a few guys out here in SE Asia have done the MAF swap using there Unichips and even SMT5.......anyhow, they have all only gained appx 5rwhp from the MAF.....the big gain most see is more the proper tuning of their car with the piggyback units. I gained 15rwhp & 11rwtq in my 3.0L stroker just from the Unichip alone.
I also have an MAF but I haven't the time to go get it tuned by the Unichip tuners....perhaps next week I'll make some time as the throttle response is a major improvement.
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I think you can follow the same procedure for the MAP. Just make sure the voltages all match up and the AFRs are right (probably high 12s, and low 13s).Im pretty sure he meant MAP, as in a manifold absolute pressure sensor. :P
The way the sensors get their info is way different... but I think it may still work.Michael Spiegle
'01 Ford Escape / Daily Driver
'99 M3 / Track Car
'87 325is bronzit / wtf car
'06 Daytona Triumph 675 / Daily RiderComment
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Thanks for your reply Chris, yes i know what you mean about the DIY side of things much better to get the guys to put the car on the rollers and Map it properly. Im not that interested in the top BHP to be great, im interested in the curv of the graph when the remap is done, the car has much better responce lower down and feels lighter to drive like a new car nippy.
If you know what i mean.
Andrew AT E30zone.co.uk | H23-is | S14Comment
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Ok. Helpful info about the MAF route but what about PHYSICALLY installing a MAP. How could I connect a MAP sensor to replace my AFM?Comment
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Just replacing the fuel metering method (ie AFM to MAF or MAP) will only give small gains because you are only able to modify the fuel curve, to get the most HP out of it you need to be able to change the Ignition curve also.
The SMT-6 etc... still use the base tune from the stock ECU and vary up-down from that, which is also more of a hinderance in FI applications where you really need to start from scratch with a standalone ECU to get the best results.
As with all car mods, it is about the level of compromise you are happy with!!!292rwhp E30 :DComment
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at least it will help with the thottle response! :DOriginally posted by E30-323tiEuro M3'87 NogaroSilver/Euro E34 M5 '93/Porsche 993 TT 97' Euro/Porsche 993 Carrera 95' Euro/Skyline R33 GT-R
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It also helps if your current air-flow device is restrictive. And as diegom6 said, if it is not responsive.Originally posted by E30-323tiMichael Spiegle
'01 Ford Escape / Daily Driver
'99 M3 / Track Car
'87 325is bronzit / wtf car
'06 Daytona Triumph 675 / Daily RiderComment
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I am planning on going the way of forced induction. I think the MAF may be a restriction even though it would flow way more than a AFM.
If I wanted to go with a MAP how would I physically connect the MAP to the engine?
Would I have to tap the intake manifold? How does it even work?Comment
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What kinda engine are we talking about? If youre worried about intake restrictions with a MAF on an M20, believe me, youve got much bigger things to worry about. ;)Originally posted by riverdale21James Peacock
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I'm going to turbo an M42. Let me worry about the reliability of doing such a feat that has already been discussed thoroughly in another string of the technical forum. I'm just looking for information on how I could physically convert a AFM to a MAP metered car.Comment
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wow turbo a M42, good luck.
Andrew AT E30zone.co.uk | H23-is | S14Comment
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