Race tuner live tunning/datalogging
Thread Starter
Evolving Member
Joined: Apr 2008
Posts: 108
Likes: 0
From: WA
Race tuner live tunning/datalogging
Ok, so I finally got around to setting up my race tuner to data log. So far, its very nice to be able to get a datalogger to fine tune the maps and customize the current available maps.
A few of things I notice that isn't working or potential bugs...
-it doesn't log IDC, it just does IPW.
-VSS is inaccurate, it reads higher mph more than what I was doing.
-this maybe normal but my TP is reading 16% when I'm not on throttle.
-Live tracing only traces 0 load column and across the rpm but it doesn't move down to trace the load cell vs rpm. This was on both ignition timing and primary fuel
Also when I did the AP update, I no longer can monitor IAT or coolant temp under Live Data.
And finally, are you able to save you datalog file? It doesn't give me an option to save and view after closing the window.
A few of things I notice that isn't working or potential bugs...
-it doesn't log IDC, it just does IPW.
-VSS is inaccurate, it reads higher mph more than what I was doing.
-this maybe normal but my TP is reading 16% when I'm not on throttle.
-Live tracing only traces 0 load column and across the rpm but it doesn't move down to trace the load cell vs rpm. This was on both ignition timing and primary fuel
Also when I did the AP update, I no longer can monitor IAT or coolant temp under Live Data.
And finally, are you able to save you datalog file? It doesn't give me an option to save and view after closing the window.
Thread Starter
Evolving Member
Joined: Apr 2008
Posts: 108
Likes: 0
From: WA
Okay I need some one to verify the injector scaler for me. I have been trying to tune for a e85 map the last week or so. I ran into a major lean out issue and could not figure out why until I looked at my injector scaler. From the help section on race tuner, it says the following:
Injector Scaler
This table contains a singular value used to represent the fuel injector size or flow rate. Any changes to this value will affect ALL tables within the ECU related to fuel delivery and load calculations. When using stock injectors with Petrol fuel, this value DOES NOT need to be altered. When adjusting this value, a lower number represents an SMALLER injector, whereas a larger scale value will represent a LARGER injector.
Tuning Tips
To calculate a starting value for a different injector size than stock, use the following formula:
New Scale Value = [(Original Injector Size / New Injector Size) * Original Scale Value] * multiplier.
For example, let’s say you are replacing your factory EVO injectors (~550cc) for aftermarket 750cc injectors. The formula would look like:
New Scale Value = [(550cc / 750cc) * 57] * preferred multiplier (1.15 works well, but this value can be modified to what works best for your local fuel and atmospheric conditions);
New Scale Value = 50
Well using the equation above, scaling for 680cc injectors I get a value of 52. So from the statement saying that smaller value represent smaller injector is incorrect! It the opposite, larger value = smaller injector vice versa. Its proven by their equation. I did it for both 1000cc (36) and 750cc (I got 48.07, which I still don't understand how they got 50) .
Following what I came up with, my car is running very well on e85 and AFR is right where it should be. Just wanted to make everyone aware of this potential issue. If I am sorry that I just wasted your time
Injector Scaler
This table contains a singular value used to represent the fuel injector size or flow rate. Any changes to this value will affect ALL tables within the ECU related to fuel delivery and load calculations. When using stock injectors with Petrol fuel, this value DOES NOT need to be altered. When adjusting this value, a lower number represents an SMALLER injector, whereas a larger scale value will represent a LARGER injector.
Tuning Tips
To calculate a starting value for a different injector size than stock, use the following formula:
New Scale Value = [(Original Injector Size / New Injector Size) * Original Scale Value] * multiplier.
For example, let’s say you are replacing your factory EVO injectors (~550cc) for aftermarket 750cc injectors. The formula would look like:
New Scale Value = [(550cc / 750cc) * 57] * preferred multiplier (1.15 works well, but this value can be modified to what works best for your local fuel and atmospheric conditions);
New Scale Value = 50
Well using the equation above, scaling for 680cc injectors I get a value of 52. So from the statement saying that smaller value represent smaller injector is incorrect! It the opposite, larger value = smaller injector vice versa. Its proven by their equation. I did it for both 1000cc (36) and 750cc (I got 48.07, which I still don't understand how they got 50) .
Following what I came up with, my car is running very well on e85 and AFR is right where it should be. Just wanted to make everyone aware of this potential issue. If I am sorry that I just wasted your time
From the subaru version of StreetTuner, a smaller injector scale value ment a larger injector. The example in the help file supports the same relationship, I would go with your calculated 52.
Thread Starter
Evolving Member
Joined: Apr 2008
Posts: 108
Likes: 0
From: WA
What I have in Italic is straight out of the help menu for the evo race tuner. So sounds like they have a typo in terms of the representation of this value, kinda an important typo that can lead to engine damage. Maybe Cobb should be aware of this?
