Nistune Forums

Hey gsracer,

Not long ago I made my own spreadsheet based on the flow data supplied on the VMPtuning site. It was for a 3 inch pipe and worked pretty well.

I just quickly changed it around for a 3.5 inch tube so give this a shot and let me know how you go. I'm curious to see if my calcs work for other tubing sizes as well. Just make sure it is definitely the VMP HPX that you have.


0 15 30 45 150 247 341 436 536 645 764 898 1048 1218 1408 1622 1861 2127 2421 2745 3101 3489 3912 4371 4867 5402 5976 6592 7251 7955 8705 9502 10349 11248 12199 13205 14268 15390 16572 17817 19126 20501 21945 23459 25045 26705 28441 30253 32144 34115 36167 38300 40516 42815 45196 47661 50207 52835 55543 58328 61189 64122 65535 65535

Cheers

[QUOTE=Precision Flow Labs;5118023]I noticed this thread on nistune Nistune Forums • View topic - MAF compatibility question: HPX 05+ MAF (for Ford Mustang) [/QUOTE]

People are trying to hack the ford HPX spreadsheet I made for the transfer function for the PMAS hpx maf lol.. If you could be so kind as to share this and point them to this thread. All people have to do is ask nicely

base flow KG/HR=-9.475184+59.921788*V-135.60886*V^2+166.77782*V^3-111.50394*V^4+44.218751*V^5-10.131798*V^6+1.2482716*V^7-0.065666262*V^8+0.00029343852*V^9

Base flow * maf housing area in sq/in= maf flow KG/HR

The V in the equation is maf volts
This equation will take maf volts from the pmas ford HPX and give you flow in KG/HR

This is the latest version I have. Its the hacked one so you can adjust the tube size and it gives you an equivalent Nissan vq map. These are the calculations used for the VQ maps in Nistune currently

Also added was the tune we did with the HPX on my R34 one dyno session. It is unfinished but we adjusted to get it idling and mid range half decent

The post I quoted was from Zilvia.net the guy makes a 3" blow through housing and setups the mafs. http://zilvia.net/f/tech-talk/501118-ne ... ption.html he was the one who made the spread sheet. I guess he couldn't register or didn't so I posted it for him. They say they can set it up to idle like stock and flow 800hp check it out those of you who are still looking for a good blow through maf setup.

Matt were you able to get your HPX working in a 2.5" blow through configuration? I'm considering using two HPX's in my Z32...

We ended up switching to suck through in 3" tube since I could not get the offset right for 2.5" on my R34

The 3" tube worked fine with the HPX on the dyno and the HPX2 on my R34. I'm sourcing more HPX2 this month. However K went from 300 upto 1300 so affected my cold starts. I'm still to look into that part

Is there any advantage to using the HPX in a suck through configuration? I would think that it would be less of a headache to adapt the OEM MAF to your 3" tube.

And when you say you couldn't get the offset right, are you referring to how deep the HPX inserts into the 2.5" tube?

To avoid reversion further is the main advantage. Apart from this no real difference

Yes I did not have the correct offset adaptor for my intercooler piping so I went to suck through instead

maglito wrote:Is there any advantage to using the HPX in a suck through configuration? I would think that it would be less of a headache to adapt the OEM MAF to your 3" tube.

And when you say you couldn't get the offset right, are you referring to how deep the HPX inserts into the 2.5" tube?

Follow that link I posted and they can setup the maf for you on the hardware side of it. Tell them your going blow through and what size pipe.