Urd Maf Input

1958 Views 15 Replies 8 Participants Last post by bigbadyoda, Feb 9, 2008

bhaacke

Discussion Starter · Feb 7, 2008 (Edited)

Urd Maf Input.....RE-GEARING?

Hey guys so I've been researching this thing forever on here but a few quick questions. So the main reason Im interested in this product is I just lifted my 08' 6 inches and put 33's under her, I have an AFE CAI and Aero Exhaust...... My prob is Im getting like 12 miles per gallon highway which freakin sucks....So Im tryin to find something that will help me improve that. Do you guys think this will help me much in that department??

Also, Im not all that knowledgable when it comes to tuning this thing at all..... Where would you even take it to get installed and would you trust em?? Everyone just keeps telling me as soon as you start messing with things like this youre just asking for trouble..... But the middle east is just bendin me over a little more than Id like soo..... Your input would be greatly appreciated! Please forgive my lack of knowledge....

Branson:thanks:

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roboots21

· #2 · Feb 7, 2008

bhaacke said:
Hey guys so I've been researching this thing forever on here but a few quick questions. So the main reason Im interested in this product is I just lifted my 08' 6 inches and put 33's under her, I have an AFE CAI and Aero Exhaust...... My prob is Im getting like 12 miles per gallon highway which freakin sucks....So Im tryin to find something that will help me improve that. Do you guys think this will help me much in that department??

Also, Im not all that knowledgable when it comes to tuning this thing at all..... Where would you even take it to get installed and would you trust em?? Everyone just keeps telling me as soon as you start messing with things like this youre just asking for trouble..... But the middle east is just bendin me over a little more than Id like soo..... Your input would be greatly appreciated! Please forgive my lack of knowledge....

Branson:thanks:

The MAF Cal. is a great addition for the Tacoma....although you cannot be guaranteed it will improve gas mileage. It did in my case (about 1MPG), but lots of other people have noted no change.

I am in the same boat as you...installing the MAF Cal was simple, but I don't have the means to tune it, so I am running the stock Tacoma map at the moment. I would like to find someone with some experience in tuning, but don't know where to start looking in my area.

I think your best bet to improve your mileage, since you lifted and went with bigger tires is going to be a gear change to compensate for the bigger tires. You could change the gears out and put in the proper ratio to try and bring your final drive ratio back to stock.

I may be offbase some here, so please people correct me if I am wrong, but I think the MAF Cal is a move in the right direction, but you are going to need more than just that.

Hope I could help!

LanNinja

· #3 · Feb 7, 2008

With proper tuning, I think you would gain at best 1 or 2mpg by using the URD MAF cali. Installation is fairly easy. The confined area under the dash makes it a little tough to work on soldering the wires. I'm not sure where you could take it to get it installed. As far as tuning, perhaps a dyno shop could help you out. The map that you get with the calibrator will get you close. There is a thread on this site where other members posted their own custom maps.

Did you regear after the 6" lift? Post some pics of your truck when you get a chance.

zmtnbik

· #4 · Feb 7, 2008

You are going to have to live with the poor gas mileage unless you spend some $$$$.

#1 option, remove the lift and put the stock tires back on...but I know that is not likely, as I sure as heck wouldn't do it.
#2 Regear....this will cost you at least $500 an axle, and I recommend the 4.88 gearing

For the record I have the URD MAF controller and am running the stock map which seems fine. I just haven't taken the time to tune it yet.
As soon as I put on my lift and my 285's (32.5") my gas mileage dropped as well. You have to also take into affect that your speedo is off as a result of the tires. I've noticed mine is off by about 5mph at 60mph. When I factor my mileage now, I add 5 miles for every 60 driven. Not the most accurate, but gets me close.

Good luck.

wjdunn3

· #5 · Feb 7, 2008

Don't forget...I have a collection of other TN usres MAF Cali Maps at http://www.freewebs.com/mafmaps that you can use. If your truck s' intake/exhaust configuration is close to anotherds I have a map for, you can use it.

Just looking at the other maps will help you get started tuning and make the whole process go much faster for you.

wjdunn3

· #6 · Feb 7, 2008

Alignment can have a negative impact on your milage also. Excessive toe-in/toe-out will significantly hurt your MPG. Have you had the alignment checked lately?

LanNinja

· #7 · Feb 7, 2008

wj, do you have one for DT headers, URD CAI, and an aftermarket exhaust? I guess I should have looked at your list before I posted this. Excuse me.

bhaacke

Discussion Starter · #8 · Feb 7, 2008

Hey you guys are great, thanks to everyone taking time outta their day to try and help me out! So I think Im gonna just go for it and try it out, probably gonna take it to a place called G&R Diesel that has a dyno to help me tune it so well see how that goes.... As far as my gear ratio goes, I believe I'm runnin a 4.56 because I have the tow package so not far from the 4.88 that was recommended to help out my MPG's.....Alignment is right on so that cant be hurtin me.....

Another question about the URD MAF, as Ive been reading up on it on here, people are talking about how it only works with open loop....not that I really understand what that means, but Im taking that unless your running at 3,000 RPMs the MAF calibrators not gonna do anything for ya... which if true sucks for me becasue Im usually running at no more that 1,500 - 2,500 RPM range unless Im steppin on it so would it do much then??? Again sorry for the lack of knowledge but again thanks so much for the advice thus far!

BHaacke:thanks:

Ill get some pics up soon, I just need it to quit snowin for at least a day so I can shine her up....

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VIPER131

· #9 · Feb 8, 2008

Urd Maf

Another question about the URD MAF, as Ive been reading up on it on here, people are talking about how it only works with open loop....not that I really understand what that means, but Im taking that unless your running at 3,000 RPMs the MAF calibrators not gonna do anything for ya... which if true sucks for me becasue Im usually running at no more that 1,500 - 2,500 RPM range unless Im steppin on it so would it do much then??? Again sorry for the lack of knowledge but again thanks so much for the advice thus far!

BHaacke:thanks:

That is correct regarding the Closed Loop and the Open Loop. The engine control unit runs the show in the closed loop mode. At higher throttle settings the engine will go into the Open Loop Mode. The Open Loop Mode is when the URD MAF will help you out. I am sure you have already read URD's info on their website.

I just drove this past weekend from Tucson (2570') through Phoenix (1300') upto Flagstaff (7000'). I used my cruise control to maintain 70MPH -- and my ScanGauge indicated that the engine went into Open Mode only a few times. Average MPG was 19 MPG.

I have the same concerns as you -- do I spend the money for the URD MAF when it is in Open Mode only a fraction of the time. But that is for a later time -- I just got my truck and am buying the external/interior stuff (canopy, seat cover, warn Trans4Mer winch/brush guard, Wet Okeles (on the group buy)).

After those are paid for -- then I will look at Supercharger/Turbocharger/Exhaust/etc....

Very Respectfully,

VIPER131

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bigbadyoda

· #10 · Feb 8, 2008

^^ that right there is the reason I'm not ordering the MAF calibrator.. For my every day driving I never go into open loop.. Very rearely go into the 2500 range either.. I mean the way it seems is unless I go over 3500+ most of the time It will help me.. I understant the ECU controls the truck in closed loop. So there is no need for the calibrator unless agian you run over 3500 rpm's a lot or race the truck regularly..

But what about the intake and exhaust? I mean it can't even fix what the intake is sucking in or exhaust is putting out in closed loop.. I'm starting to see why I even would need it??

bhaacke

Discussion Starter · #11 · Feb 8, 2008

Again thanks for your input guys.... So for those of us that dont run much in the open loop staying between 1,500 to 2,500 RPMs what do we do to not only increase our gas mileage a little bit but get the most out of our cold air intakes and exhausts in closed loop??? Ive looked a little bit into the UNICHIP but havent heard much good about it especially for how much they want for it?? Confused, was hoping the URD MAF was my answer but not so sure anymore........

BHaacke:thanks:

bhaacke

Discussion Starter · #12 · Feb 9, 2008

Regear

so after doing some research I think you hit the nail on the head ZMTNBIK.... I called toyota to figure out for sure what differential gear....mine is 3.72 so thats gotta be the reason why my MPGs are so crappy with my lift and tires.... I made some calls today and will be changing my gears to a 4.56.... Im hoping that will help as well as make things easier on my engine...... Its gonna be a little expensive so for you that know more about gears do you think Im making the right move?????

Bhaacke

LanNinja

· #13 · Feb 9, 2008

^ It can only help. Good luck

ELLIOTACOMA

· #14 · Feb 9, 2008

im right on the edge of buying the urd maf... but then i get confused after reading the above posts... on other threads, i thought i have read that the urd maf can tune both open and closed loop???? if that is the case, wont you see better performance for both??? there has been so much information lately on this topic.... someone set me straight!

wjdunn3

· #15 · Feb 9, 2008

The MAF Cali on "Tunes" the OPEN loop mode (when the AFR signal is being ignored by the ECU). The MAF Cali can still affect the MAF signal in closed loop, but the engine ECU will drive the AFR to near 14.7 regardless of what the MAF signal is.

Aftermarket intakes can introduce error in the MAF signal, so you can use the MAF Cali to correct the signal so that the ECU short-term and long-term fuel trims are near zero. The closer they are to zero, the less work the ECU is having to do to keep the AFR near 14.7 in closed loop mode.

http://www.urdusa.com/product_info.php?cPath=66_72&products_id=1260198051

For those of you who think your truck doesn't go into open loop mode very much should hookup a scan gauage and drive around with it for a week or two and notice when the loop mode changes. I think you will be very surprised as to just how often it does go into open loop.

bigbadyoda

· #16 · Feb 9, 2008

wjdunn3 said:
The MAF Cali on "Tunes" the OPEN loop mode (when the AFR signal is being ignored by the ECU). The MAF Cali can still affect the MAF signal in closed loop, but the engine ECU will drive the AFR to near 14.7 regardless of what the MAF signal is.
I do have a scanguage set up at all times in my truck.. The only times I see it come on when I do my driving is when I start it up or I get above 4K which is never hardly.. I tried to make it come on the other day and did a 3rd gear pull and it only went into open loop at 4K and over.. I mean it might correct the a/f if adding and intake and exhaust i'm just not sure about where it is able to tweak the ECU, whethe or not it's able to in closed loop. I'd buy one but I'm afraid it'll not to me any good.

Aftermarket intakes can introduce error in the MAF signal, so you can use the MAF Cali to correct the signal so that the ECU short-term and long-term fuel trims are near zero. The closer they are to zero, the less work the ECU is having to do to keep the AFR near 14.7 in closed loop mode.

http://www.urdusa.com/product_info.php?cPath=66_72&products_id=1260198051

For those of you who think your truck doesn't go into open loop mode very much should hookup a scan gauage and drive around with it for a week or two and notice when the loop mode changes. I think you will be very surprised as to just how often it does go into open loop.

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