General Need input with S-AFC , 650s and EVO-3

[mosul210]

Hey folks setup consists of Evo-3 turbo, walbro 190, ETS street FMIC, FIC 650s, and S-AFC. I'm having problems dialing-in the 650s....with boost set at 20psi and S-AFC set to -38 from 3200rmp - 7000-rpm the car is still running rich. Did boost leak test and car holds 30psi steady...Anyone else running a similar setup? What are your settings on the S-AFC?

Lastly, please no responses about getting a better tuning device - its not an option at the moment. Also I know every car is slightly different so I am just looking for general information that I may use as a guide. Thanks!

 

[mosul210]

Im surprised no responses yet...I would think Evo3 setups with 650s would be common.

 

[volcomsnow245]

Do you have a afpr?

 

[mosul210]

Do you have a afpr?

I don't have one...I was told I did not need one with the walbro 190 pump.

 

[Junfan]

I am running a very similar setup except I have a wideband, egt, fpr, delta 264/272 combo and walbro 255. I am currently set around -13% idle. I am running around -15 to -16 percent generally speaking but every car is different. We have similar setups but what I have experienced so far is take two identical cars install an SAFC and they will and can end up different.

Do you have any way to datalog the car? Also, do an ECU reset and if you can datalog the car you should see STFT and LTFT and make sure they are getting adjusted. I had to do this a couple times to get closer. I reset had the car at like -7% and my LTFT where maxed at -25. I then took it to -12 and started again and just keep doing this watching for my trims to start zeroing out. I am pretty close now as I did another reset yesterday at the above numbers.

 

[DJ23GSX]

650's with a safc can be a tuning nightmare for some people. I tried it years ago and ended up with ridiculously high timing cause I was leaning out the safc so much with my 650's. 650's are a bit too big for the safc to compensate for by itself. Once I got a eprom chip to compensate for the 650's tuning was a breeze.

 

[whtgst]

I was running the same set up but with a vrsf set up and I think I was -48%, if I remember right, above like 3500rpms and my afr's were about 11:1. If youre still too rich, take more out. Pretty straight forward. The safc can only handle 650's at the most. So of course its gonna be very close to maxed out. I think at idle it was around -13%ish though.

 

[DJ23GSX]

I was running the same set up but with a vrsf set up and I think I was -48%, if I remember right, above like 3500rpms and my afr's were about 11:1. If youre still too rich, take more out. Pretty straight forward. The safc can only handle 650's at the most. So of course its gonna be very close to maxed out. I think at idle it was around -13%ish though.

His biggest problem is going to be the very aggressive stock 1g timing maps and when you start taking that much fuel out with the safc its only going to get more aggressive which in my case caused knock issues. In my 1g with 650's and safc I was seeing 25* or more of timing at 21psi on a small 16g which is too aggressive for that much boost and it was causing knock. Once I put in my keydiver eprom chip that compensated for the 650's my timing came down to 19* and all my knock issues were gone. The general rule of thumb I've found here on the forums is that you don't make any extra power by running your timing over 20*. Stock 2g timing maps are a lot less aggressive than the 1g maps so you can sometimes get away with the just an safc to tune the 650's without running into timing related knock.

 

[sexystover]

i agree, i was running 660s with an safc and was knocking up top even with a 11:1 AFR i ended up going with DSMlink to adjust timing since i couldnt get rid of the knock because of the stock timing map

 

[mosul210]

Thanks for the input guys...I will look into a keydiver chip as a temporary fix and look into DSMLink as a permanent solution down the road.