What MAF will do 1000whp?

Post by **jrhdohc** » Sat Nov 28, 2009 12:40 pm

cool. why did you switch back?

Post by **Cjmartz2k** » Sat Nov 28, 2009 12:53 pm

Crappy performance at lower rpm. The MAF got real "confused" at part throttle transitions (lifting, rolling into WOT going up a hill in a higher gear at too low an rpm, etc) and it would go way rich. If we leaned out those specific spots tuning, it would lean pop in other types/areas of driving. It just didn't have the resolution down low. Now WOT in boost it working like a dream.

Post by **jrhdohc** » Sat Nov 28, 2009 1:04 pm

i guess i'm confused. so your high hp MAF did or didn't work?

Post by **Cjmartz2k** » Sat Nov 28, 2009 1:08 pm

It worked, it was just "touchy" and I got poor gas mileage. It's because we "made'' it at the shop. I daily drove it like that for a year or so. Some of the aftermarket ford ones are much better at dealing with that problem. I just didn't go that route and had a chance to go to a D-jetro for no money what so ever, so I jumped on it.

Post by **jrhdohc** » Sat Nov 28, 2009 5:17 pm

ic... sounds like MAP might be the way to go.

Post by **BHFR-GTR** » Sun Nov 29, 2009 3:52 am

sorry it took a min to get back to you i have been out of town, but that pic came from my engine bay, that is a greddy dual maf intake i think it was like 250 bucks from sp engineerring they had one in stock when i called, it is set up for twin z32 mafs hope this helps

Post by **Beanstalk** » Mon Nov 30, 2009 2:59 pm

Cjmartz2k wrote:
First, REMOVE THAT HUGE a** PIC FROM YOUR SIG. Second, do you understand the fact the power FC's come in both MAP and MAF flavors? Simply suggesting the most well known aftermarket ecu as a soultion to a problem where people can't use the Z32 MAF which supports over 500rwhp because it's not big enough probably isn't going to be very helpful. Somebody talking about making 1000hp isn't going to be doing it with a SAFC. I'd bet he already has a MAF style Power FC and wants to stick with it since they are so expensive. I'm sure he has his reasons for not going D-jetro (MAP) power fc or something like a haltec or F-con V-pro.

Now hush, the grown-ups are talking.

...LMAO thanks for the advise but I do have the PFC .... The only problem is they dont make the d-jetro for the 25 .... and you hear from the pnut gallery that it's coming out soon but let me be the first to say it. It's not.... apexi has abandoned it the same way they discontinued the pfc for the 25 I will keep it as long as i can make 800whp (no nitrous)

Post by **SullivanRacing06** » Tue Dec 01, 2009 3:37 pm

i was interested in doing this on my rb, i found a svt maf that was rated to 1000 plus but they told me to take a hike b/c im a import

Post by **DrifterProdigy85** » Tue Dec 01, 2009 5:09 pm

Who told you that?

Post by **l0nestar** » Tue Dec 01, 2009 5:10 pm

jrhdohc wrote:
2JZ has both MAF and MAP stock. Lower power (stock) MAF is Load and MAP is boost sensor. Medium power they disable the stock MAF and run MAP for Load. I think it's good for around 1.5 bar. High power a huge single turbo with aftermarket 3-4 bar sensor.

Not quite hotshot. You make some of the funniest posts ever.

Post by **Cjmartz2k** » Tue Dec 01, 2009 7:05 pm

SullivanRacing06 wrote:i was interested in doing this on my rb, i found a svt maf that was rated to 1000 plus but they told me to take a hike b/c im a import

Shouldn't need there help with anything. I can't tune, but from what I've seen my tuner buddy (Stec) back in Okinawa do, it was just a matter of figuring out the MAF voltage curve just like any 0-5v MAF. Also, you'll need to figure out what pin does what to wire it in, but there should only be a few pins to figure out (5v, ground, signal, etc.).

Post by **Darius** » Wed Dec 02, 2009 5:41 am

DrifterProdigy85 wrote:Who told you that?

SCT has told me that same thing. Sad how domestic loyalty takes precendence over running a good business...

Post by **Darius** » Wed Dec 02, 2009 5:57 am

Cjmartz2k wrote:

Shouldn't need there help with anything. I can't tune, but from what I've seen my tuner buddy (Stec) back in Okinawa do, it was just a matter of figuring out the MAF voltage curve just like any 0-5v MAF. Also, you'll need to figure out what pin does what to wire it in, but there should only be a few pins to figure out (5v, ground, signal, etc.).

Yes, that is all you need to do and I know it will be cake to do with the PFC. Repinning/wiring will be easy too. The hard part is getting the voltage/air flow relationship correct. This winter I want to buy one of their large 4-inch MAFs, hook it up to a flow bench and figure out the voltage for given flows. I'll post the info all over the internet for imports just to piss them off

Post by **Cjmartz2k** » Wed Dec 02, 2009 7:21 am

DO IT!!!

Seriously though, I'm no tuning expert (or even novice), but Stec figured mine out as we drove down the road. He made it idle, then had me step on the gas (while parked) and get it to "X" rpm higher and higher at about 500rpm intervals and rescaled the map doing that up to about 5k rpm to make it drivable. Then we went out and tuned, and he kept rescaling the curve. He only tweaked the fuel map when we were finishing up the WOT tuning, and his tunes kick a**.

Post by **gawdzilla** » Wed Dec 02, 2009 8:35 am

the thought of this crossed my mind back before i went d-jetro.

in theory you could build an intake pipe with the original MAF and the SCT MAF in series, and log the voltages of both while driving around such that you have some comparable voltage numbers vs. airflow to extrapolate a best guess curve for the new maf. that would help, considering the PFC calculates airflow in a weird unit anyway.

Post by **Cjmartz2k** » Wed Dec 02, 2009 2:42 pm

The D-jetro does it in a weird way, but MAF is pretty straight forward.

Post by **DrifterProdigy85** » Thu Dec 03, 2009 3:52 am

Darius wrote:
SCT has told me that same thing. Sad how domestic loyalty takes precendence over running a good business...

Lol. I contacted SCT back when i had my SR and the guy i talked to was more than helpful to me. I told him what i had and the power i was looking for and he told me what i needed and then we started talking about his S13 he used to have. lol. I was asking him all kinds of questions of Blow Through setups and stuff like that. You must of just got someone having a bad day.

Post by **Darius** » Thu Dec 03, 2009 5:18 am

haha well call that dude back and get the info out of him.

Post by **s14_sport** » Thu Dec 03, 2009 9:02 am

I have been running my Ford SVT MAF for about a year now. But I am using a tuned ECU from Jim Wolf Tech which they claim is capable of 700HP with the right turbo. The ECU is actually from a 91-94 Maxima that they flash for use with the RB.

It a great tune that I'm happy with just alittle rich at idle. So had to use S-AFC to clean it up a bit.

My new turbo setup I wanted to try and clean up the engine bay so I set it up as a blow though MAF. I'm not sure how well this is going to work with the JWT ECU and the S-AFC, but, I also have a PowerFC that I will try as backup. I have found a rough voltage map online for the SVT Maf so I'll give it a shot.

Post by **DrifterProdigy85** » Thu Dec 03, 2009 6:24 pm

Darius wrote:haha well call that dude back and get the info out of him.

His name is Sean Jakober. Email is [email protected]. Last i talked to him was back in august i think. With the economy its hard to say if he still works there. An email would be worth a shot though.

Post by **Darius** » Fri Dec 04, 2009 4:08 am

Cool! Thanks. I'm on it like Tiger Woods.

Post by **Madgoal1** » Fri Dec 04, 2009 6:19 am

you have mail

Darius wrote:Cool! Thanks. I'm on it like Tiger Woods.

Post by **Darius** » Fri Dec 04, 2009 1:21 pm

Thanks Sean! It is exactly the information that I was looking for! I will post it a little later tonight

I just got to looking at the FC datalogit inputs and, no surprise, the PFC values for the MAF voltage vs. air flow are not intuitive. Does anyone know off-hand what the following "units" that Apexi uses are?

RB25DET MAF ____________________(0 to 5.12V) = (0 to 4423) unitsRB25DET MAF w/Apexi Power intake __(0 to 5.12V) = (0 to 4647) unitsZ32 MAF ________________________(0 to 5.12V) = (0 to 7546) unitsQ45 MAF ________________________(0 to 5.12V) = (0 to 6683) units"Custom" MAF ____________________(0 to 5.12V) = (0 to 10860) units

Website · Post by **meet07** » Sun Dec 06, 2009 5:23 am

what kind of blow through tube are you using?? I found this that might help everyone if they dont allready know.....

Seems that you can bolt the lightning maf up to this blow through tube that eliminates the maf blowing up. might be a great alternative when using something like nistune..

link:http://www.atomicperformance.c....html

Post by **Yellow4g63** » Sun Dec 06, 2009 2:40 pm

why buy the tube when u can just buy the adapter to put on your own tube?http://www.vmptuning.com/store...&pg=1

Post by **Bernard** » Sun Dec 06, 2009 2:52 pm

http://www.abacoperformance.com/products.htm

You could accomplish the same thing with dual z32 mafs or a single maf and a bypass pipe the same size . Either way it sounds like a fun project.

Post by **Darius** » Sun Dec 06, 2009 5:14 pm

Fellas. The easy part is finding a MAF or creating a MAF setup for measuring the increase in air flow.

The tricky part of this upgrade is properly telling the ECU how to interpret the voltage signal from the larger MAF sensor.

I have searched on the datalogit usergroup and have found no concrete answer on what units the powerFC uses for airflow units for the MAF. The internet is not turning anything up either. I e-mailed Ali at Apexi-usa but he apparently does not work for them anymore. I think I am just going to try contacting Apexi-usa to get a solid answer to this question tomorrow.

What air flow units are used in other EMS's?

scarboroughdub · Post by **scarboroughdub** » Sun Dec 06, 2009 8:35 pm

The main issue is maf Linearization table, Once you can properly translate the airflow versus voltage. then all you really have to do is retune for the change in Theoretical pulse width.

Rb26 Maf translation

Lightning Maf translation

Post by **AZhitman** » Mon Dec 07, 2009 5:59 am

<...we interrupt this kickass thread for a message from the management...>

Best thread going right now... Some great expertise being passed along. You guys are making my head hurt!

...any chance someone might want to compile the information herein into an article? (I'm not so sure I could do it justice.) If so, touch base with me via email.

Carry on, gents.

<...we now return you to our regularly scheduled programming...>

Website · Post by **meet07** » Mon Dec 07, 2009 6:07 am

Yellow4g63 wrote:why buy the tube when u can just buy the adapter to put on your own tube?http://www.vmptuning.com/store...&pg=1

Just what I was looking for. Saw it in one of your builds...THANKS!!!!!

What MAF will do 1000whp?

Re: (Cjmartz2k)

Re: (jrhdohc)

Re: (Cjmartz2k)

Re: (jrhdohc)

Re: (Cjmartz2k)

Re: (Beanstalk)

Re: (Cjmartz2k)

Re: What MAF will do 1000whp? (Beanstalk)

Re: (jrhdohc)

Re: What MAF will do 1000whp? (SullivanRacing06)

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Re: What MAF will do 1000whp? (Cjmartz2k)

Re: What MAF will do 1000whp? (Darius)

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Re: What MAF will do 1000whp? (Cjmartz2k)

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