Jump to content
SAU Community

Recommended Posts

Hi guys, on the Datalogit Settings, Page 3 there is configurable table for the 20 map reference points for RPM and the 20 map reference points for Airflow.

The default RPM reference points are in 400 rpm increments from 400 rpm to 8,000 rpm.

The default Airflow reference points are 1446 (load point 2) increasing by 482 up to load point 10 then 964 from load point 10 to load point 15 then 1928 from load point 15 to load point 20. This is determined by the Air Flow Curves (AFM voltage ramp table) which is also on Settings Page 3

Datalogit_Settings_3.jpg

Hope that was of some help :D

sydneykid - Looking at the screenshot are all the white cells user definable? If they are then it certainly looks like fc-datalogit might be the only way around it??

Yep, the whites are input cells.:)

Hi guys, on the Datalogit Settings, Page 3 there is configurable table for the 20 map reference points for RPM and the 20 map reference points for Airflow.

The default RPM reference points are in 400 rpm increments from 400 rpm to 8,000 rpm.

The default Airflow reference points are 1446 (load point 2) increasing by 482 up to load point 10 then 964 from load point 10 to load point 15 then 1928 from load point 15 to load point 20.  This is determined by the Air Flow Curves (AFM voltage ramp table) which is also on Settings Page 3

Datalogit_Settings_3.jpg

Hope that was of some help :)

That looks interesting, SK, so to get more load points out of the PFC, which values need to be changed?

That looks interesting, SK, so to get more load points out of the PFC, which values need to be changed?
I don't believe it's a matter of getting more load points, but taking the 20 you have and "stretching" them out, by increasing the "distance" between points on the AFM axis of your map.

I doubt you need to alter all of them, perhaps the top 5, obviously once something as fundamental the "scale" on you map changes the associated fueling values will need to change also.

I hope i made some sense there, if not, ignore me and wait for SK to ride to the rescue! :)

Hi SK,

After a little investigating it appears the rb20's airflow value at load point 20 is roughly the same as the rb25's airflow value at load point 15.

Oosh, You are spot on, all it does is reduce the resolution, the rb20 map reference with the rb30 is fairly usless as to use load points 5-12 you really have to concentrate to only ever so slightly touch the accelerator.

Bigger motor drawing more air the 2.5ltr reference map suits it much better. :mad:

I've stumbled upon an interestering airflow vs horsepower relation. :mad:

After using the rb25det reference map, the airflow required to make ~200rwkw now uses load point 15-16, previously with the rb20det reference map it was maxing out at load point 20 to make the same power.

Calcs.. It appears that the rb25det reference map has been scaled enough to support ~325rwkw of power on the same dyno and peak RPM as I and Bl4ck32 use.

I find it interesting that I am making ~176rwkw and using load points 18-19, both Bl4ck32's and my power figure is supported by the calc. :lock:

Obviously an rb20det, rb25det or rb26dett may make use of the air supplied a little better or worse, the power figure as a result 'should' vary with different motors and RPM!

Now to find some one that knows the power they make at approx 5000rpm with a PowerFC and see if the calc can 'predict' the load point they will use. :D

If it appears to be fairly accurate, we will be able to weed out those bodged dyno power figures. :D

I haven't really thought about rpm at this stage, I have no idea how it scales its airflow/loadpoints as rpm increases, or if it does at all.

My map trace is horizontal, from 2000rpm it drops to load point 18-19 then sits there all the way to peak power.

As an engine increases RPM its supposed to increases its airflow requirement. :confused:

Just to note, I noticed for example.

A load is placed upon the motor that is inbetween two airflow values. The PFC will do a linear (I assume) calc and determine the value to use for that load.

So providing airflow and ignition timing required is linear between the two load points the pfc will do a pretty damn good job working out the optimal value.

It will only do this where ignition timing or fuel has different values between load point cells.

Hope that makes sense. :mad:

Cubes , have been very interested in this topic . Is there an Apexi PFC for the VG30DET or VG30DETT ? If so it would be interesting to know their reference tables particularly as the airflow would be based around 3 litres .

Also probably impossible but are Z32 ECU's electrically similar to R32's ?

Cheers Adrian .

I've stumbled upon an interestering airflow vs horsepower relation. :D

 

After using the rb25det reference map, the airflow required to make ~200rwkw now uses load point 15-16, previously with the rb20det reference map it was maxing out at load point 20 to make the same power.

 

Calcs.. It appears that the rb25det reference map has been scaled enough to support ~325rwkw of power on the same dyno and peak RPM as I and Bl4ck32 use.

 

I find it interesting that I am making ~176rwkw and using load points 18-19, both Bl4ck32's and my power figure is supported by the calc. :lock:  

 

Obviously an rb20det, rb25det or rb26dett may make use of the air supplied a little better or worse, the power figure as a result 'should' vary with different motors and RPM!

 

Now to find some one that knows the power they make at approx 5000rpm with a PowerFC and see if the calc can 'predict' the load point they will use. :D

If it appears to be fairly accurate, we will be able to weed out those bodged dyno power figures. ;)

 

I haven't really thought about rpm at this stage, I have no idea how it scales its airflow/loadpoints as rpm increases, or if it does at all.

My map trace is horizontal, from 2000rpm it drops to load point 18-19 then sits there all the way to peak power.

As an engine increases RPM its supposed to increases its airflow requirement. :confused:

Interesting, ultimately the engines power would depend on its VE at the various airlfow rates. That can vary by 15% or so at numerous RPM's.

One thing I would add is that the RB25DET AFM (PFC default) is set for 5.1 volts at 10860, which is around 170 rwkw. Yet the load point mapping goes to 21213, this means 5.1 volts (the AFM maximum) of 10860 is around load point 14/15. So a standard RB25DET AFM could never show more than load point 14/15.

You are at load point 18/19, but I can't remember what AFM you have?:mad:

Sounds fairly spot on SK, I was very close to 5v on the std RB20DET afm (which actually was a R33 S1 AFM) before the tune so obviously a few more rev's I may have seen it hitting 5v or slightly over.

I made sure before the tune I wired in the Z32 AFM, it has hit a highest of 4.1v on Load point 18/19.

Where did you grab the R33's Airflow airflow value at 5.1v?

Going by the table below (taken from FC_Pro Apexi Software) R32/R33 at 5.1v has an airflow value of 4423. ;)

It doesn't make sense. Especially when you look the Z32 apparently has a higher airflow per voltage than the VH41?!?!

Discopotato,

The airflow reference map from a VG30 would be very interestering to see.

It appears the FC-Logit doesn't do one for the VG30 nor does the Apexi FC Pro Software.

Both softwares do one for the 2JZGTE, might see if I can grab it from the FC Pro Software.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • For these last 7 years of ownership, I've always had to use a small scissor jack under one of the front tow hooks to raise the front just enough so my low-profile jack fits under to reach my subframe jack point. I'm beginning to get annoyed of always having to do this. Are there any lower low-profile jacks that fit under the gtr lip on a dropped car?
    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
×
×
  • Create New...