RomRaider

Did you adjust the tip-in threshold for your injectors?

Do you mean the throttle disable threshold? If so, then no, it is still as set from factory (21.7).

A little more info, I thought it might have been tip-in related, but it occurs well after tip-in enrichment has ended and I am cruising with the same throttle position.

Also, it doesn't happen 24/7 at a specific throttle position percent, and it isn't the easiest thing to replicate by simply using the same throttle position percent. It is almost like there is some kind of rpm-v-throttle compensation with load based activation - but no tables like that exist in the ROM.

From trying to replicate it, it seems to only occur with throttle position <4% and low load - like when you are cruising and there is a long, shallow decline in the road and you are trying keep to a specific speed.

Maybe it is some type of "tip-out" table that doesn't decay for some reason due to the conditions described?

Leslie

Is there a threshold for tip-in in ms? I thought there was.

Yeah, tip-in enrichment activation is in ms and then there is the normal tip-in enrichment table which is also in ms. However I'm not sure how it could be tip-in as it happens well after tip-in has occurred (as seen by watching logs and waiting for afr to stabilize after throttle change).

I've actually just tried the latest latencies as suggested by Mike at DW and it seems to be better, but there are still times where it occurs and AFR goes lean and AF correction jumps to +25%. I'll go for a bit of a drive now and try and replicate it for you - I'll log tip-in just in case.

Leslie

Hi Mikey

I tired to use the speradsheet to scale my MAF.
Attached is my learningview screen cap, and the spreadsheet populated with my log data.
For some reason the MAF (volts) in the Graph Data tab don't show past 2.30. My log data goes all the way up to 2.84.
Do I just apply the scaling up to 2.30v? Or is there a way to fix the sheet so that it goes up to 2.56V (40g range)

And to apply the scaling I just add or subtract the figures in column "S" to corresponding voltages in MAF sensor scaling table in Romraider correct?

Some more info:

Bullwinkles stage 2 map. (06 WRX)

mods
Maddad/Perrin catted dowwnpipe (two high flow cats)
Stock resonated midpipe
Scoobysport Axleback
Prodrive IC y-pipe
Stock panel filter (Had a K&N panel filter, it gave me the same airflow corrections)

I did the logging on a 2hr highway drive, and I believe there is a tone of data above 2.3v,
but for some reason Column M (Average Total Correction MAF Volts only goes up to 2.3v)
Looks like it's trying to calculate data for the remaining rows, but the MAF v don't show up.

On the graph data page, where it gives me all the calculated corrections after filtering data, I have:

Injector Size 904 cc/min
Latency Offset 0.91 ms

My injectors are Witchhunter modified and flow matched stockers. Average flow is ~ 810 cc's. Is this telling me that I should have ther injectors scaled to 904cc?

The latency offset shows an offset of 0.91ms. What voltage is this at? (14v I would assume?)

Finally, in the "S" column, are the corrections shown actual values or are they % correction? Example...

Correction of 2.90 at 1.72V. Do I add 2.90 to the g/s at that voltage or add 2.90% to the g/s?

Just as an update to the problem I had a while back - I basically started again from scratch with my injector latencies, injector size and MAF Scaling - and now I don't have the problem any more.

I suspect the problem I outlined is a direct result of incorrect injector latencies and MAF Scaling.




Have you changed your MAF Scaling at all? Have you got an aftermarket air intake, turbo inlet or MAF housing?

Start by putting your stock airbox, air intake, MAF housing and turbo inlet back on and setting your MAF Scaling back to stock. Then set your tip-in and injector latencies back to stock and set the injector scale/size to the size of the injector that was flow tested the lowest by witchhunter.

Once done, start the car and while idling, fine tune your 11.5v, 14v and 16.5v injector latency values by 0.02ms at a time until your car can idle with the least amount of A/F learning.

Once done, you can reinstall your aftermarket air intake, MAF housing and turbo inlet and start tuning your MAF using one of the methods outlined HERE.


Leslie

I do not have an aftermaket intake. I still use the stock airbox.

After I installed the 16g, injectors, FP etc.. I dialed in the latancy using the method you mentioned above. My injectors are scaled to the smallest of the 4.

I'm just trying to figure out what the correction factors in the spreadsheet are eaxtly. If they are actual values or percentages.

Also, the fact that the spreadsheet told me to scale my injectors to 904cc was a bit confusing.

...Still confused as to how my latency offset could be .91 ms?

This spreadsheet won't work for injectors.

At the time that I wrote this spreadsheet, I had assumed that the target AFR in CL was 14.7. It's not.

Thanks..
That kind of threw me for a loop.

(closed loop..that is)

I added some street tuner parameter names. I don't know if it works correctly since I don't own street tuner. I based it on a log that someone sent me.

The access tuner stuff works but I had to add a cel to enter latency from log, then subtract from the given latency in the spreadsheet. But I never always get correct latency's from the sheet anyway so its a mute point. I think the way latency is figured has an error under certain conditions or mods. For instance it will give me some rogue off the wall latency figure like .80 or .90 when the correct latency is used and fuel trim maf scale is fine. The correct perams are logged also. The sheet does a great job at showing maf v error. And I like using the maf 3 graph.

Yes, the latency is off. It assumes the target AFR is 14.7 in CL which is not true.

I just use AFR learning to tune the latency and the bottom end of the MAF scale (not at the same time of course).

Hi, I am trying to use version 7 of the spreadsheet to scale the CL portion of my MAF scale. When I Add the data and filter it, everything is getting filtered out and nothing is getting transfered to the Graph Data Sheet....what am I missing?