Stock MAF vs Uprev GT MAF
12-22-2011, 04:05 PM
#1
Stock MAF vs Uprev GT MAF
Can any show the differance between the Stock MAF and the Uprev GT MAF.
As in, Air Flow (CFM) vs Voltage
either in a Graph or Table form.
I think this will help people undestand what it is doing.
To say that it supports High Horse Power forced induction does not tell us what we all need to know.
As in, Air Flow (CFM) vs Voltage
either in a Graph or Table form.
I think this will help people undestand what it is doing.
To say that it supports High Horse Power forced induction does not tell us what we all need to know.
UpRev MAF GT sensor will read almost 180% the air flow range of the factory sensor while allowing stable idle air flow measurements. If you have a Nissan or Infiniti vehicle that you're adding Forced Induction to, you will need this upgraded MAF Sensor. We've worked for many years to offer a MAF sensor that we can put our name on. Finally we have the right sensor. Years of being the only manufacturer to support Forced Induction properly on the Nissan vehicles using the factory ECU has allowed us to understand what our customers need and this is the product we've brought to market.
12-22-2011, 04:16 PM
#2
Sooooo, the more air flow, the more voltage you need. This MAF extends the voltage past the stock range. Since FI exceeds the stock whp by 100, 200, 300whp, this MAF allows the ECU to see it and tune it accordingly.
The alternative to a MAF is tuning by MAP, which requires a standalone to mask the higher MAF voltage and keep it happy, while still being able to produce monstrous hp.
The alternative to a MAF is tuning by MAP, which requires a standalone to mask the higher MAF voltage and keep it happy, while still being able to produce monstrous hp.
Last edited by kacz07; 12-22-2011 at 04:20 PM.
12-22-2011, 06:07 PM
#5
In my experience in the electronics field, you simply can not feed more than 5V in to an IC that is built to work on a 0-5V scale. Same goes for 4-20mA circuits.
Last edited by Boosted Performance; 12-22-2011 at 06:10 PM.
12-22-2011, 06:08 PM
#6
They are both 5V max. The difference is that the aftermarket MAF are reprogrammed or otherwise scaled for higher flow.
For example, the stock MAF maxes out at about 400whp or so (5V) where the PMAS flows around double that before hitting 5V. I don't have hard numbers (since nobody really pushes the limits of Uprev) but I'm pretty sure someone made close to 700whp with a PMAS without maxing it out.
No idea about the flow rate of the Uprev GT MAF...it's pretty new. From what I have heard, it flows similar to the PMAS but has better idle resolution.
For example, the stock MAF maxes out at about 400whp or so (5V) where the PMAS flows around double that before hitting 5V. I don't have hard numbers (since nobody really pushes the limits of Uprev) but I'm pretty sure someone made close to 700whp with a PMAS without maxing it out.
No idea about the flow rate of the Uprev GT MAF...it's pretty new. From what I have heard, it flows similar to the PMAS but has better idle resolution.
Last edited by djamps; 12-22-2011 at 06:13 PM.
12-22-2011, 06:26 PM
#7
I don't think it reads 9.0V. I believe it is still 0-5V but it is scaled different. Let's say 500cfm with the OEM sensor will get you 4.0V, the same 500cfm will read 2.2V with the GT sesor. It also depends on the diameter of the tube the sensor is in.
In my experience in the electronics field, you simply can not feed more than 5V in to an IC that is built to work on a 0-5V scale. Same goes for 4-20mA circuits.
In my experience in the electronics field, you simply can not feed more than 5V in to an IC that is built to work on a 0-5V scale. Same goes for 4-20mA circuits.
From what I know about these things, I'm pretty sure that this is right, too.
Sorry, but what do you think a set of numbers is going to do for you? If you Google PID controller (not sure if our MAF's are literally PID, or not, but the point remains) and you fully understand some of those hideous transfer functions/integrals/calculus, I suppose the numbers could help you out, but if not, I don't see how it would benefit you.
Is something wrong with your car and you're trying to narrow down a diagnosis?
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12-22-2011, 07:06 PM
#8
So then, isn't the resolution basically cut in half?
They are both 5V max. The difference is that the aftermarket MAF are reprogrammed or otherwise scaled for higher flow.
For example, the stock MAF maxes out at about 400whp or so (5V) where the PMAS flows around double that before hitting 5V. I don't have hard numbers (since nobody really pushes the limits of Uprev) but I'm pretty sure someone made close to 700whp with a PMAS without maxing it out.
No idea about the flow rate of the Uprev GT MAF...it's pretty new. From what I have heard, it flows similar to the PMAS but has better idle resolution.
For example, the stock MAF maxes out at about 400whp or so (5V) where the PMAS flows around double that before hitting 5V. I don't have hard numbers (since nobody really pushes the limits of Uprev) but I'm pretty sure someone made close to 700whp with a PMAS without maxing it out.
No idea about the flow rate of the Uprev GT MAF...it's pretty new. From what I have heard, it flows similar to the PMAS but has better idle resolution.
12-23-2011, 04:51 AM
#10
Pretty much. And in the case of PMAS there is practically no idle resolution and they transfer function varies from MAF to MAF. You have to use a bit of creativity in the tune to get things 'stock like'. *SUPPOSEDLY* the GT MAF resolves some of the inconsistency and idle resolution issues of the PMAS. I don't know any first hand experience yet.
12-23-2011, 10:54 AM
#11
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rcdash or anyone with osiris tuner could get in and do a screen capture on the software. I can't get into it anymore but if you clicked "pmas" for the maf selection it would load up all the load values for the pmas linked to the voltages. You could look at that and compare it to the stock one if you wanted.
Those numbers won't do much good outside of tuning with osiris but you can at least look between stock to pmas to compare.
I'm curious what you have cooking in your head Tim. You use SS box which has nothing to do with maf tuning so you've got me wondering....
Those numbers won't do much good outside of tuning with osiris but you can at least look between stock to pmas to compare.
I'm curious what you have cooking in your head Tim. You use SS box which has nothing to do with maf tuning so you've got me wondering....
12-23-2011, 03:38 PM
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hmm, my car wouldn't run with the pmas in unless i had the pmas selected so it has to obviously change the values otherwise i could have swapped them back and forth. The values in them were wildly different at each voltage.
12-23-2011, 03:44 PM
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Now I only use Osiris tuner for idle and turning off OBD codes since I picked up a Haltech. I haven't looked back.
I'll grab my cable out of my car tomorrow and take screenshots of my table and stock.
12-23-2011, 07:38 PM
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I just realized what could be done to map it out for flow. I'm not sure if cipher does this but i know my innovate stuff does so Tim you can do this:
Log maf voltage and flow rate (gpm i think) then put in your GT maf and do the same. Then you can compare the flow rate for the same voltages in logworks.
12-23-2011, 08:06 PM
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If the GT maf and the Pmas reads gives off half the voltage than OEM at the same air flow, why not just add a resistor on the signal wire with the OEM sensor?
I wonder if that would work, It would take some testing and calculations to get the proper resistor but if it works it would be much cheaper than GT maf
I wonder if that would work, It would take some testing and calculations to get the proper resistor but if it works it would be much cheaper than GT maf
12-23-2011, 08:25 PM
#18
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If the GT maf and the Pmas reads gives off half the voltage than OEM at the same air flow, why not just add a resistor on the signal wire with the OEM sensor?
I wonder if that would work, It would take some testing and calculations to get the proper resistor but if it works it would be much cheaper than GT maf
I wonder if that would work, It would take some testing and calculations to get the proper resistor but if it works it would be much cheaper than GT maf
12-23-2011, 09:39 PM
#19
I could do that, but I think I would need a Complete Retune with the GT. This is part of the reason I brought up this subject.
weird, maybe each pmas is different. Mine was spot on. Hal used it for about half a day of tuning until i decided i just needed a haltech. He didn't seem to have any issues with the pmas and using the pmas table.
I just realized what could be done to map it out for flow. I'm not sure if cipher does this but i know my innovate stuff does so Tim you can do this:
Log maf voltage and flow rate (gpm i think) then put in your GT maf and do the same. Then you can compare the flow rate for the same voltages in logworks.
I just realized what could be done to map it out for flow. I'm not sure if cipher does this but i know my innovate stuff does so Tim you can do this:
Log maf voltage and flow rate (gpm i think) then put in your GT maf and do the same. Then you can compare the flow rate for the same voltages in logworks.
12-24-2011, 06:17 AM
#20
Any time you change to a different kind of MAF you need a retune. @binder you got lucky... my car ran better on the stock MAF table than the PMAS LOL. I ended up building a log analysis tool that created a new MAF table for me, which ended up looking nothing like the Uprev table.