MAF Limit = 2048 kg/hr

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

Commercial bins not allowed here. Only stock or self-tuned bins.

offset · **Joined:** Thu Aug 29, 2013 10:54 pm **Posts:** 15

That's what I figured, except to me it seems like a dealer sold Dinan car is as OEM as Alpina, which has been posted

busterhax · **Joined:** Wed Jan 22, 2014 6:54 pm **Posts:** 1773

offset wrote:

That's what I figured, except to me it seems like a dealer sold Dinan car is as OEM as Alpina, which has been posted

It's still a product Dinan offers to this day. Dinan stuff isn't included in the Daten files either.

All the dinan mototronics box does is apply resistance to the MAF signal wire so that it pegs at 5v much later than it would without the resistor. Various other companies that offer superchargers copied the exact same schematic. It's the cheap way out but works.

dschultz · **Posted:** Fri Sep 30, 2016 8:51 am

dschultz wrote:

mrf582 wrote:

Yeah, I agree. RR is a little finicky about copy/paste right now so please use the Excel sheet I attached to the first post.

I believe the problem with copy and paste into tables is due to extra fields in the first row of data which should only contain the table type.
If you make your changes in the spreadsheet and then try to copy them to RR it will most likely fail.

You can worlk around this by first copying the data from the spreadsheet into a text editor.
A 2D table for example:

Code:

[Table2D] <tab> <tab> <tab> <tab> <tab> <tab> <tab> <eol>
0.8984375   0.9375   0.9765625   1.015625   1.0546875   1.09375   1.1328125   1.171875<eol>
1.128449917   1.29974997   1.487149954   1.683449984   1.891449928   2.124499798   2.388399839   2.6868999<eol>

What you won't normally see is that there are "tab" formatting characters in the first line up to the end of the line (eol). These all need to be deleted. On the first line place the cursor after the ] and press Shift-End to highlight all the tabs to the end of the line, then press delete.

Code:

[Table2D]<eol>
0.8984375   0.9375   0.9765625   1.015625   1.0546875   1.09375   1.1328125   1.171875<eol>
1.128449917   1.29974997   1.487149954   1.683449984   1.891449928   2.124499798   2.388399839   2.6868999<eol>

Now select all (Ctrl-a) and copy this data and paste it into the RR table.

This should be fixed in the latest release of RR Logger, no first row manipulation should be needed anymore.
http://www.romraider.com/RomRaider/Download

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

[EDIT]

I had posted here that I was unable to open my 256k full read from my 41.1 ID60, and was asking if anyone had been successful with it. It seems that the problem was that my file was corrupted, probably from me trying to mess with the MAF table in the partial file... Anyway, I guess I'm good to go now, after opening an old full read and working from there. :oops:

[EDIT2]

In case anyone cares, I just successfully pasted ba114s Nissan MAF table into my 41.1 ID60 full read bin, so yesterday's success is not a fluke haha...

mrf582 · **Posted:** Fri Mar 24, 2017 5:09 pm

Can someone who has doubled the MAF limit post some single gear (3rd or higher) WOT logs that show RPM, Load (mg/stroke), and MAF Airflow (kg/hr)?

Thanks

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

My car is torn down for turbo install currently, but hopefully (with any luck at all) I'll have it back together within the next couple of weeks and I will be happy to post some logs.

FWIW, I found that I needed to scale up ba114's MAF table a BUNCH to get my load levels in the right range for my autotragic trans controller to be happy. So much so in fact, that the last five cells or so are truncated to 2047.xx.

But she was running great after a couple days of tuning in the N/A range so I could tear it down and add turbo. Very happy with the outlook on this!!

Actually, if you are interested in logs that don't use much of the MAF range, I can post up something from N/A tuning?

busterhax · **Joined:** Wed Jan 22, 2014 6:54 pm **Posts:** 1773

mrf582 wrote:

Can someone who has doubled the MAF limit post some single gear (3rd or higher) WOT logs that show RPM, Load (mg/stroke), and MAF Airflow (kg/hr)?

Thanks

What are you looking for? I have in in volts on hand and my maf table..

mrf582 · **Posted:** Fri Mar 24, 2017 5:40 pm

I am looking to see the relationship between Load and Airflow at various RPM points and compare them to the stock setup. Yeah, NA logs are fine but FI logs would be good too. Especially in the spool-up region of a turbo.

I'm worried that having a turbo that gets to 1 bar of boost by 3000RPM on a 3.2L engine will overflow the Load variable.

These are the mathematical limits.

Code:

RPM   Load    Airflow
 500   1389   125
1000   1389   250
1500   1389   375
2000   1389   500
2500   1389   625
3000   1389   750
3500   1389   875
4000   1389   1000
4500   1389   1125
5000   1389   1250
5500   1389   1375
6000   1389   1500
6500   1389   1625
7000   1389   1750
7500   1389   1875
8000   1389   2000
8500   1389   2125

I think any half decent turbo setup is probably flirting with this and there is a chance to overflow the Load variable in code and result in seriously lean AFR.
Superchargers need not worry since they don't have the same increase in airflow at low to mid-rpm as a Turbo.

pazi88 · **Posted:** Mon May 08, 2017 3:09 pm

mrf582 wrote:

I think any half decent turbo setup is probably flirting with this and there is a chance to overflow the Load variable in code and result in seriously lean AFR.
Superchargers need not worry since they don't have the same increase in airflow at low to mid-rpm as a Turbo.

Seems that you are right. But the overflow seems to happen way sooner that you have in that list. Like in my testing:

As you can see there around 800kgh/4300RPM/1000mg/stroke load there happens overflow and MAF airflow and injector PW gets cut in half. Still the load seems to be ok. :shock:

I'm using ms41.2 in 2048kg/h mode, euro s50 MAF with 2.2k resistor ( We did max the MAF with 1k resistor at around 5000 RPM). The MAF scaling it seems bit high but around that area that shouldn't be too much off. So with correct MAF scaling I can fix the problem but, we can't raise up the boost at all, because that limit.

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

Pazi88, I think I have the same "boost cut" type behavior as you are seeing there, but I thought mine was a transmission safety feature because I get a transmission code about load signal over CAN when it happens. Maybe I'm completely wrong about that, which is great, because it means that there might be some more hope for more boost. I'm currently limited to about 8psi.

pazi88 · **Posted:** Mon May 08, 2017 4:09 pm

Between 7-8 psi here too. Which is quite low. I'm thinking that maybe I have to make MAF table more linear after 700kg/h so that it doesn't follow the third order polynominal function and limit load like that. It will make tuning the fuel/ignition maps harder but at least load is calculated correctly in normal driving area where it matters most.

tjabo · **Joined:** Tue Apr 21, 2015 4:18 pm **Posts:** 166

I was thinking the same thing about rescaling the MAF curve over maybe 500 or so kg/hr to compress the remaining range enough to allow for desired boost levels. BUT, now that I know that it's not just my automatic transmission control unit causing troubles, I guess maybe we need to look for the real reason the problem is occurring.

I'll dig back through my logs to see if I can find the places where the problem cropped up. Otherwise, I'll go out and make some pulls with the allowable boost, then raise the boost a tiny bit to cause the "boost cut" effect. Maybe that will give Shek some useful data...

pazi88 · **Posted:** Tue May 09, 2017 4:10 am

Have you taken logs about what happens? Because it also might be transmission problem. There is a load limit that can those can accept.

But it's a shame that that does happen. Otherwise the engine works butter smooth, AFRs are spot on and it pulls good. But we can't do full WOT pull because it will hit that limit. Also we would like to pump up the boost to on 1bar (14-15 psi).

ba114 · **Joined:** Wed Oct 21, 2015 2:36 am **Posts:** 980

In my testing I believe I've also hit this limit. At around 3500-4000 rpm in 2nd and 3rd gear I experience a hard jolt and power is cut. I don't have any logs that capture it accurately however one log it did occur following the last recorded load value being above 1000mg/stk.

RomRaider

Forum rules

MAF Limit = 2048 kg/hr

Who is online