I'm also experimenting with a "Stock boost solenoid" trick... But I'll post details of it in the how-to section if my results are encouraging and the modification is simple..

 

that was perhaps the first time i have ever heard someone recommend ADDING fuel to the evo under stock boost settings........FWIW with the settings i posted we tested the car at 1.5bar(with a spike actually a little higher than that) and there was absolutely 0 detonation and an a/f ratio of 11:1. however this was done with about 4 gallons of 100 octane mixed with 91. on a daily basis i run 1.35bar on 91 octane and have no probs.

 

FWIW, I heard from a number of people that you don't want to lean out the car before it hits peak torque - plus it's really only the high end that needs leaning out, and not the low end.

 

Yep.. There is a small amount of boost spike no matter what you do.. and I'm not the only one who has added a little fuel at lower RPM's at WOT.. Under load at lower RPM's it seems to lean out quite a bit more then running WOT through the gears..

What I mean is if your at a roll, and (for arguments sake) not downshifting, if you load the engine and it spools, it can go lean from about 3000rpm to 4500rpm so it seems to want a little more fuel in that case.. But if your running through the gears, you don't normally see that because you've launched probably around 6000rpm (5500 or so), and shifting at points well into the car's power band (4500 or highter) so you'd never typically see it.

Most of the settings I've seen either do not remove fuel below 4000rpm, or adds a small amount..

Hope this explaination helps.. Just remember (I've been saying this quite a few times) that most tuning is done under Wide open throttle, to get peak Dyno power.. But not necessarily the best drivability in every circumstance..

 

On topic, and yet not, anyone know of a awd dyno shop near Kalamazoo, MI? I'll be running SAFCII with the following by next Monday hopefully: UR turbo back(test pipe), SBC-id set to 20, walbro, 660 injectors, Buschur(MAP, filter, upper IC pipe, Intercooler). I have the luxury of a 100 octane pump about 10 minutes away, and I keep a 30 gallon drum of MS103 in the garage for my bike, but I generally run the 100 octane, since the Evo is a toy and doesn't go very far.

Anyone running similar set-up with 100 or close to it, what are your SAFC settings?

 

I didn't see anyone mention this so I thought I would chime in...

Z1 Highly recommended PocketLogger to tune a car with... When I install my parts im going to be using a SAFC 2-PocketLogger-EVC 5 Combo. I will probably have an EGT & Boost Gauge installed also.

Check out their website pocketlogger.com

 

Holy ****...you fill your car up with 100 octane? Replace your head studs and run more than 20! Although I don't know whats safe for the stock turbo...but you have some serious potential with the 100 octane daily driver!

 

I don't know you can go much higher than 22psi with a stock turbo.. I think at that point its no longer able to efficiently provide more boost.. With 100 octane fuel, you can obviously run a bit leaner than most of us at the same boost levels.. But at that point your dealing with much higher EGT's which could have other destructive repercussions.. Besides.

The advantage of 100 octane fuel is being able to run 21psi of boost with a lower chance of detonation. Keep in mind that your S-AFC tuning, or whatever you may end up using, will probably be closer to a stock fuel curve for this car because the extra boost means a little extra fuel..

I think ultimately you'd need to tune specifically for your setup since there are just way too many variables for us to give any guidelines other than "Safer" baselines that work as a starting point.

In my case, I started with Buschur's settings, and they were a little rich, but when I upped my boost to about 21psi, it ended up being too lean.. I ultimately dropped my boost to 19.5 (or 20psi depending on temp/air density) and left the settings alone.. I'm still concerned about being in a danger zone, but there is currently no knock.

At some of these levels of performance, you start to have to worry about Fuel Cut since you have to feed the engine a little more to get more power (more boost, more fuel than our conservative settings)

I think I'm rambling and more or less regurgitating everyone elses info at this point.. so I'll stop here..

 

FYI My experience with the pocket logger is it can't sample data fast enough especially at higher RPM's.. However it does work if you only have a few items to monitor but definitely not the ideal way to tune (Even road tuning is a final step after getting a good dyno tune) logging EGT, boost levels, a Wideband O2, using some sort of logger, and a way to correlate the data (importing into Excel or a specific tool) to map the EGT, O2 values, possibly throttle position and injector duty cycles against RPM will be the only way to know for sure where your fuel curve needs work, or if your beginning to hit the limits of the equipment (Stock ECU, turbo, Injectors, etc..)

 

these settings posted are all negative numbers correct?

 

Yes.. Most of the settings I've seen in this thread are NEGATIVE percentages..

I did find some tuning optimizations that improved drivability quite a bit.. I raised the LO-TH point from approx 35% to 55% and the HI-TH point from 60% (or so) to 75%

What I discovered was my car (and probably many of us) would get part throttle full boost and with the SAFC in open loop means that the car experiences a lean condition.. So I raised my settings so my "Settings under the curve (WOT)" were generally closer to stock and more or less unmodified until I hit a much higher Throttle position.. It definitely made quite a bit of a difference and doesn't appear to have hurt WOT performance because the overall settings are the same at that point..

 

Anyone messed with Decel Air settings yet for a VTA setup?

Kyle M.

 

There are decel air settings? I haven't seen them on my unit (SAFCII).. I heard somewhere that's only accessible on a car with a wire flap (I think that's what it's called) sensor?

 

There is a decel air setting for turbo cars to help stalling or stumbling problems associated with vent to atmosphere blow off valves... just wondering if anyone has toyed with the settings on the evo yet.

Kyle M.

 

Where are these decel settings?