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Modifiying Stock MAF's!
So who has done it and has words of advice.
Anything from moving to a different tube, changing the MAF tables, adding a resistor to the signal wire, a voltage clamp... I am in the process of trying all of these and want to see what others have done! Working with a bosch MAF off a 95 5series bmw. It maxes out at like 10psi around 4.5k and pulls all my timing so my AFRs shoot to nines and I lose a ton of power. I need some more ideas to mess with this MAF lads. Anyone resistor or clamp successfully? Would that make my last column of values under load/voltage just be used for the entire range of 10-25psi from 4-7k? :1 |
Re: Modifiying Stock MAF's!
I have moved dual mafs from the skyline gtr from the stock size tube to a 3" tube. At 500whp they read 4.3vdc and better than stock driveability with some tuning. I didn't touch the transfer (vq table in nissanese) table at all. I fired up the car with no changes to start with, then changed the k-value by the percentage needed to achieve a 14.7:1 afr after the engine was warm.
I have also dropped voltage via a resistor. Retuned as per above. I have also bypassed the maf by installing another pipe with a filter behind the maf. This achieves the same thing as a larger tube without having to touch the stock maf. I knew by how much I wanted to increase the size so the bypass was made the same size as the larger injectors were over stock. I then retuned the spark table and did a bit of fine tuning on the main fuel table. I much prefer bypassing as it circumvents failsafe's such as min maf voltage and lowers the restriction the maf element presents to the inlet passage. |
Re: Modifiying Stock MAF's!
larger maf body for maf sensors (separate from body) basically cut the flow it sees down.
if it's one unit like older cars liked to use, then i dunno. resistor or maf hack ftw |
Re: Modifiying Stock MAF's!
You might be better off just running a decent MAF out of the gate. Get one of the 3.5" GM/Hitachi units, run a freq-volt converter if your ECU is expecting a 5/12 volt hotwire unit, tweak MAF table to suit.
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Re: Modifiying Stock MAF's!
there is an 803 porsche hfm that with my current tuning capabilities would be plug and play but costs ~250$ new
I am trying to make 100% sure that I am beyond working with the stocker before I upgrade, thats the easy way out. |
Re: Modifiying Stock MAF's!
Contact Hitchhikkr about a better priceon that MAF, if you have to go that route.
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Re: Modifiying Stock MAF's!
Originally Posted by Joseph Davis
Contact Hitchhikkr about a better priceon that MAF, if you have to go that route.
Originally Posted by ichbinsobose
there is an 803 porsche hfm that with my current tuning capabilities would be plug and play but costs ~250$ new
Am I wrong in thinking that you can use the MAF translator or the PROversion? It has a function to convert to a GM style map sensor, or run the 3"-3.5" gm MAF sensors. $400 bux doesnt sound too bad. I know they work well on dsms and supras, couldnt be too far off on bosch system. |
Re: Modifiying Stock MAF's!
You can build a freq-voltage converter for under $10. If you can tweak your MAF tables in the ECU no need for the whole MAF-T package.
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Re: Modifiying Stock MAF's!
Originally Posted by Joseph Davis
You can build a freq-voltage converter for under $10. If you can tweak your MAF tables in the ECU no need for the whole MAF-T package.
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Re: Modifiying Stock MAF's!
Originally Posted by Hitchhikkr
OIC, good to know.
Common logic 2907/2917 does the trick. I have a couple somewhere in a bin as I was going to help Pokey do a poor man's MAF-T on his Eclipse before he got angry with the thing and beat all it's windows out with a crowbar. |
Re: Modifiying Stock MAF's!
interesting idea JD. I am meeting with a romanian and peurto rican in a dark parking lot sunday night to play with far east tuning concepts, resistors and some bessoted voltage clamp, ALL AT ONCE ^-^
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Re: Modifiying Stock MAF's!
I make ideas reality. Follow my path, my russian padawan.
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Re: Modifiying Stock MAF's!
yeh
looking through my garage tonight for a zehner diode and 1200ohm resistor to just get some sample fiddling done |
Re: Modifiying Stock MAF's!
Worthless.
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Re: Modifiying Stock MAF's!
i only need it to be 25psi out of a holset worth of goodness
one more retard tells me they have a maf rated for "at least 21 psi" ::) and I will leave the internet for good |
Re: Modifiying Stock MAF's!
I have a maf rated for at least 21 psi
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Re: Modifiying Stock MAF's!
your not a retard
if you told me that i'd take your word for it and take it for a ripper
Originally Posted by c0mpl3x
ill try to hook you up with a wrx or an sti maf. they're good to ~21psi
lol sorry jon :X |
Re: Modifiying Stock MAF's!
found a 5.1v and 4.7v zehner diode in my box of leftovers
the 5.1 did nothing (testing it) the 4.7 works I tested by doing second gear rippers... since my MAF stopped loving boost over 10 psi I would have 100% traction in second, I was logging afrs, hammered it up a hill and slid sideways, the AFRs were no longer 9.0, but like 14.0 so I immediately let off and pulled over to burn another chip. Worked on it for about 10 minutes now I have ~11-13Afr in boost up to 20psi and 6000rpm, then the last 5 psi or 1000rpm whichever comes first it dips to 9's again. So, a work in progress, but, PROGRESS! Good times, I'm liking this whole "thinking" thing I've done once or twice with this car. :8 Now, considering a 400-800ohm resistor prior to the diode. It may give me that last 5psi/1000rpm, and take my HG and rods with it. |
Re: Modifiying Stock MAF's!
when i was in highschool a buddy of mine got a 3000gt vr-4, i came over to help him work on it. by the time i got there he had the maf in his hand with pliers ripping out the honeycomb.
he thought i could flow more air that way. i still make fun of him, even tho he has an 11 second eclipse |
Re: Modifiying Stock MAF's!
Originally Posted by MAJORAHOLE
when i was in highschool a buddy of mine got a 3000gt vr-4, i came over to help him work on it. by the time i got there he had the maf in his hand with pliers ripping out the honeycomb.
he thought i could flow more air that way. i still make fun of him, even tho he has an 11 second eclipse |
Re: Modifiying Stock MAF's!
removing the "honey comb" on a MAF in any car I have ever witnessed does nothing but get rid of a negligible restriction, a perhaps unnecessary filter, and a rumored "flow straightening" design. Leaving it in is a free mod that's guaranteed not to ---- ---- up. Only time I would get rid of it is when replacing the maf table and moving the sensor to a plain aluminum tube of a + size to make it meter perhaps more air.
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Re: Modifiying Stock MAF's!
The 'thinking' thing I've done one or two thousand times has lead to things called 'wisdom' and 'insight'
I'd rather build a $10 freq-volt converter, and get a 3" GM MAF on the cheap, than ---- around with MAF clamps. It'll require you to find that pesky trip point in your code you are trying to bypass, but... |
Re: Modifiying Stock MAF's!
This update to my tune was free JD. And I think it is reasonably safe... got beef with it?
my setup = time + money I am currently trying to use my leisure TIME to bypass my hard earned MONEY. :-* I also updated my tuning "capabilities" as homosexual as they are, to encompass any ODB1 6cylinder BMW made. :6 Time to find a local non homo with a 4cyl for me to play with up at UP. |
Re: Modifiying Stock MAF's!
I have taken Subaru JECS MAfs and modified them to the 400 whp subaru level.
Before. http://www.vincentfurniture.com/phot...maf/Before.jpg http://www.vincentfurniture.com/phot...oreoutside.jpg Filling exterior with epoxy http://www.vincentfurniture.com/phot...dcoatepoxy.jpg Milling out http://www.vincentfurniture.com/phot...illingout1.jpg http://www.vincentfurniture.com/phot...illingout2.jpg http://www.vincentfurniture.com/phot...illingout4.jpg http://www.vincentfurniture.com/phot...illingout5.jpg Aftermilling http://www.vincentfurniture.com/phot...terfilling.jpg Hits 5 volts at 28-30 psi? Don't know the actual flow #s, but pretty darn good. |
Re: Modifiying Stock MAF's!
I'm not criticising, but like I said it's wisdom and insight developed over years.
Look at my original posts on pgmfi to see the sort of ghetto ass trash ideas I cut my teeth on. Not so different from what you are doing, you are learning valid lessons. Now, go fist a chicken. |
Re: Modifiying Stock MAF's!
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Re: Modifiying Stock MAF's!
yo reddevil, you need a spare jecs maf?
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Re: Modifiying Stock MAF's!
I pay $20 for working ones.... thats my core charge for the modified ones I sell.
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Re: Modifiying Stock MAF's!
You can't beat a GM maf, and if you get the right conversion setup (such as like the mafT used on DSM's) it can be used as a blow-through setup with very good results. I've seen more than a few DSM setups run a 61mm compressor and larger with a GM blow-through at numbers as high as 30-35psi.
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Re: Modifiying Stock MAF's!
Originally Posted by slo_crx1
You can't beat a GM maf, and if you get the right conversion setup (such as like the mafT used on DSM's) it can be used as a blow-through setup with very good results. I've seen more than a few DSM setups run a 61mm compressor and larger with a GM blow-through at numbers as high as 30-35psi.
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