All,

I will be upgrading turbo (fpgreen), IC and exhaust cam very soon. With the added airflow, I will be maxing out the stock injectors or very close to.

For that setup, I will buy 720cc and am looking how to setup ecuflash for the bigger injectors.

Now, after reading some threads, this is what I got so far. Please correct me if I am wrong. Also... any suggestions or comments are always welcome.

Steps:

1. Change injector scaling for something higher than 513 in ecuflash. I am thinking based on the threads that it will be something around 650 to start.

2. Monitor the fuel trim lo and fuel trim hi in evoscan. I saw a post where they mentioned that the o2 feedback trim should be use as the fuel trim hi. I think that I need clarification on this part.

3. Based on the results, then adjust latency @ 14 V.

4. Repeat 2 and 3 until you get your trims in order. In evoscan... what will be the ideal results to determine that the trims are in the desired values?

Any help on this matter will be greatly appreciated!

If anybody has this injector size (or close) in their car. Can you share your settings?

 

bump!

 

I am in the same boat....but i am getting 850cc injectors....anyone!?

 

Well!

I may need larger than 720cc for my new setup! So... we are in the same boat!

 

Alan are you getting a bigger turbo? My buddy has a 50 trim and he uses 780's and they are more t han enough for his car. Alan I can help you get your injectors sized. I have the Yellow Evo with the CF wing. I met you at Fusion.

 

Yeah but remember that a 20g flows almost like a GT30 turbo ....and at 30psi on race gas i think the 850s might be a better contender ...Thanks for offering the help!

 

Would you mind sharing your configuration? I think that Inj Size Scaling and the Voltage Latencies are the only ones required.... right?

 

here is what malibujack said

"It takes time, but the trick is to start really rich, smaller size and leave the latency what is documented for the injectors (use the AEM calculator)
Then, you adjust the scale until your fuel trims at idle are very close to zero..
Then drive the car around for awhile, and see how off the long term fuel trims get after a long drive.. At that point you can adjust the 11v and 14v injector voltage latency settings until overall you get your trims while driving in check.. Then you'll have to adjust idle one more time.
What this will do is it should get your fuel injectors, to read "ROUGHLY" close to what your fuel map looks like by the numbers.. Its not quite right, but it should be similar..
Doing this will give you the best drivability and then you can tune your maps... Just remember to make the maps rich to start before you do too much.."

 

you know.. I just did a search on " injector scaling" in this forum..

I came up with 90 hits, all with relivant info. No offense, but can you at least try to search?

 

Did you read my post at least?

Please limit your comments to factual information answering the title by correcting me on the "Steps to Injector Scaling". Thats what a forum is about!

Yes, I did search for all the threads and from that I got to this far as stating on post # 1. With all the information between all the misleading posts.... it is hard to trace what is the safe sequence to get it done.

Thanks for your contribution!

 

Thanks for the info!

I got the Injector Spreadsheet with all the AEM calculated latencies.

It make sense to me to first go smaller size on the Inj Scaling field to get the car to run rich at the beginning. Then.... continue to play with the Inj Scaling until you get your trims online at idle. Then drive around to play with the latencies based on the trims! {thumbup)

 

sorry, my mistake. like you said, there are many misleading or conveluted posts.

The info is there, just trying to keep the dilution of knowledge here to a minimum.

 

Agree!

I thought for a moment that there was already a preset settings to the Injector Scaling. Sort of like a table to look for this parameters. In essence it is.... But now, after reading more posts is: 1. Vehicle independant up to a certain point. 2. It is a bit of trial and error for setting at idle and while cruising.

Actually, I did followed your comment and did more reading. I will keep the dilution of knowledge to a minimum as well! Good point!

 

Just scaled my ECU to run FIC 850cc injectors....here are the results....all my hard work is on here so a simple thanks from those that use this and get favorable results will be more than enough!!!!! Now for the maps!!!

These settings got me 11.1-11 AFRs on my configuration....PM me for details...

 

alan678,

Thanks for sharing!

I just got the fpgreen and I think that I might get the 850s as well!

A couple of quick questions:

1. You are using 91 octane. Right?
2. What is your AFR at idle?
3. Any idle problems?
4. Where did you buy the injectors?