Not sure on the A32 unit.

96sleeper and krismax have also done this. Check with them.

 

werd thanx, but 915Max had his setup already (I got some ideas and tips from him before starting), but not yet installed from the last I heard from him... --> http://forums.maxima.org/showpost.ph...79&postcount=6

Maybe he'll shime in and give us an update.

gtr_rider, Im down to do this again, but you have to provide me with a spare MAF that works. We'll discuss that on AIM.

Also, I forgot to mention, the Im using the Q45 MAF sensor input on the SAFC (01). So I was REALLY running rich, but it allowed me to do even more correction. My previous highest correction point was 4500 and it was -19%, now my current corrections for 13.5:1 throughout my powerband are as follow (Note- FP= 55psi, Walbro 190)...

3000= -17%
3500= -24%
4000= -29%
4500= -29%
5000= -22%
5500= -22%
6000= -21%
6500= -18%

I am still pending to do a 3rd gear pull with streetzlegend's OBD2 scanner/ logger thing to see where my ign timing is at. I wanted to do this before with the A32 MAF but time complications came to place.

 

Oh yea? ok well I should restate it as it having a 3" ID from the air filter to the MOUTH of the TB . And yes Q45 TBs are 90mm, also not sure which year, but my friend with an RB20DET swapped S13 has one in his closet, he's not sure what year its from tho, just says that he took it off an "old school Q45".... ACTUALLY, I think he told me it was the Q45 that Wu-Tang uses on their music video for "C.R.E.A.M.", which is an 89-96 model with the 4.5L (nice reference huh? LOL).

And yes, response is much better indeed. No cons involved at all, just the fact you have to get a lil dirty, lol but really its not rocket science, doable in one afternoon (and a very RICH drive to the dyno [or test road if you have a wideband] to tune) :lolz:

 

..

 

Now perhaps people will start believing that the DBW is NOT responsible for the throttle lag.

 

Subscribing for 95BLKMAX's timing curve, also NMEX can you link me to that a33b timing curve as well, non TS, thanks

 

Yup, the 90mm Q45 is a bunch bigger than the 70mm Pathy TB...

http://i48.photobucket.com/albums/f2...3/Dscn1847.jpg

 

Agreed. The response is better than my A32. I want to say the difference is amazing, but until more people start doing this via DBW, we can't prove anything aside from personal opinion.

http://forums.maxima.org/showthread.php?t=524793&page=2

 

Unfortunatley, when it comes to mods and changes, my car is at a dead stand still... I still have not installed it due to a lack of money for tuning. I really dont want to run the car with the 3 inch MAF w/o tuning it... I hope that I will be able to tune it within the next month(bonus check)... money's been mad tight cuz of the new house....anyways... Good job 95BLKMAX, and im glad I could be of some help.

 

Thank you, and definately, house is more important than car. But do shime in when you have an update

 

This the the Maf were looking for correct?

http://cgi.ebay.com/ebaymotors/LAND-...QQcmdZViewItem

 

Exactly. But remember you still need the Maxima sensor to use in that housing. Perhaps someone will figure out how to use the BMW/Rover sensor instead. It might not take very much work.

I think this MAF is also used on the Ferrari F360.

 

what size couplers are you guys using for this maf?

 

Since I used PVC tubing, the OD of it was 3.5", so I had to use a 3.5>3.5 coupler

 

Well, looks like my MAF sensor does not work.. I still have to go in and check the readings off of the MAF.

So its back to the drawing board for me. I need to buy another MAF and re-do the whole set-up... I really dont want to tamper with the only one I have and then be left with without a running car

I decided to install it just to see how it feels and the car did not start at all... I think it might have soemthing to do with the fact that i removed the housing all around the wire on the MAF rather than keeping it surrounded... oh well, trial and error!

 

so the VAFCII only goes up to 15 out??

 

Check to see what setting = Q45 MAF on the VAFCII. IIRC, this has not been done yet on a VAFC equipped vehicle. But as far as the settings, that should work fine(Q45)

 

so i am starting to think that the 82mm maf is NOT doable with a VAFCII...

i was using 1 in 1 out with the stock setup, no problems

with 82mm maf:

1-8 out i would get no codes but would run like crap(super rough idle, hesitation, bogs down when gas is pressed).

9-15 out would set off code P0102 throwing the car into limp mode.

If anyone has any other ideas as to what could be wrong, I'm all ears.

BTW...i was looking at the SAFCII manuals and it seems that you guys actually have an application guide and i have yet to see anything like that for the VAFC...

 

It is doable, just not as simple as it is w/ SAFCII. Now, you must correct your AFR accordingly. Before SR20DEN brought the IN/OUT settings to my attention, I had to adjust quite drastically to get it to run right (+25-27% corrections)

In order to do this you will need a wbo2 sensor, and a live readout will be very helpful.

 

i have the wbo2, so ill have to make corrections pretty much from idle up?

 

Go try it out and see what I mean, it's not that hard. For me closed loop is/was fine since O2's take care of that. It's idle and open loop where things become fun/interesting. I still have a slight hope/feeling that you can do re: IN/OUT settings w/ the VAFC.

Wait a minute though.....
So what exactly were the settings you used for this trial/error combo here? 1-1, 2-2, 3-3.....? If so, Use 1-2, 1-3, 1-4 ...etc

 

i was using 1-2, 1-3 etc.

I'll see what i can do tonight.

 

There is an application guide but all the cars listed are hondas.

http://www.jrponline.com/downloads/docs.asp

 

MAP vs MAF too.

 

It's expecting a pressure sensor to be used on those cars instead of a MAF. So it will have preprogrammed pressure vs voltage curves for the MAP sensors, for the purpose of displaying what pressure it thinks the engine is experiencing.

But if it just uses a % correction to adjust the signal going to the ECU (which it seems to) then it can be used with a MAF (or any other voltage based sensor) no problem. It might just display as a pressure on certain screens.

 

I've done my share of reading re: high altitude living. But this is a very good explanation re: the concept. link .:saved:.

It(VAFCII) is and can be used w/ our cars. But, we are trying figure out that correction curve when using a larger MAF housing.
We know in a small nutshell that more cross sectional area = less flow = way lean condition, but the SAFC corrects for it somehow using this IN/OUT sensor setting.

How would it relate to it re: MAP sensor, and how can it be corrected, if at all, using different IN/OUT sensor settings? At this point it seems as if post # 99 is the solution....

 

Yeah I know the VAFC is being used on our cars. Sorry if I answered something you already knew the answer to, I didn't read back far enough or carefully enough. I thought you were asking something different. I see now what you're after.

Yep sounds to me like you'll just have to change the IN/OUT settings and datalog AFR accordingly to see what's the most suitable.

 

screwed around with it a little...

looks like 1 in 3 out gave me the best drivability... and it was pisspoor, at best

this setting is giving me a super rich condition, like in the 9's. that was after i already was taking out -15 to-20 at all rpm ranges.

ok just got back from another round of testing... WOT is getting better but part throttle is terrible with misses and just feels sluggish....

i think i am just going to get an EB or safc2... both proven to work with this.

 

I highly recommend the EB if you're going to give up on the VAFC2.

 

does the EB have a WB02 input?

 

It does have a 0-5v linear input which can be used as such.

 

Maybe im late, but did anybody ever figure out the correct IN vafc2 setting for the q45 maf?

 

why not an EU?? and why would you need more adjustment with a map sensor than just the typical A/F tune? it doesnt read the same way as an MAF, the only difference would be a little extra air that is not accounted for, but it wouldnt misread as badly as an MAF in a BBMAF tube. maybe i have badly misconceptualized the MAP though

 

Just turned on my car with a new 3" maf and its runnign like crap obviously, so i shut it off. I need to know the IN setting! I looked around a bunch of these threads but found only info for the safc.

 

nmex has posted in many threads what he is using, search his posts to find something useable. obviously it will be a little rich then, but thats better than too lean

 

nmex is using safc2, not vafc2

 

find the list of supported vehicles (their number values) and use the max in, w/e else out. i bet a google search would turn up a good list

 

Or post # 103 on this very page.
http://forums.maxima.org/showpost.ph...&postcount=103

At this point it seems as if you guys w/ VAFCII need to 'raw tune' as explained by me earlier on this page.

 

thought maybe he could find one that related better, ie: not honda's. but im sure if he looks carefully he could find it there.

PS: do you have idle/cruise problems? or just WOT? cause the O2's should be taking care of the difference when in closed loop

 

Not sure if you meant that toward me but:
I don't have any problems aside from my small idle problem that I've fixed.


Back to the question at hand: It's designed to work w/ MAP equipped cars, period. That's the reason why everyone thought they only work w/ Hondas. There may or may not be a way to alter the signal like SAFC users, but if you have a wb, then tune away tuner people.

You could sit there for about an hour trying different IN/OUT settings, so if you've got the extra time, try that instead.