Hi everyone I wanted to post a little different way to tune the pcv pti on my xp900 E85 turbo setup(it should work on other models and fuels as well). I have been fighting with my tune for a while because everything was a compromise. I have been tuning on the pressure map for a while and ran into a wall at higher part throttle speeds the motor is running 10psi @ 38% throttle 7200rpm and wants -20 fuel now smash the throttle and the same place and pressure are way to lean. Basically you cant compromise 10psi part and wot the loads are very different. So with the help of sandman who showed me how to do a metric conversion on the pressure table I went a step further and inverted the map fueling. So what this does is I am now tuning for BOOST on the THROTTLE POSITION side instead of pressure side. So far this method has proved out very well I can tune MUCH quicker and be more precise with where I put the fuel. I am running a 12.8afr at part throttle 75mph@7800rpm 10psi and still drop to 11.8afr 7800rpm 10 psi WOT. I dont have it fine tuned yet but it will make a good base. If any anybody would like a copy of the map to try pm me an email and I will send it:ride:
broken-01
I tune using this method as well but I think I've done it a little different then you have maybe. I use auto tune. I started with my fuel map as my old N/A tune and enabled my autotune to tune via the pressure so it would build the fuel pressure map. I built the pressure pressure map 1st (dialed in a close tune then let autotune take over). Once my fuel pressure map was built where it fueled it good under boost, I then changed my autotune over to tune via TPS, then let it build the fuel map. Once that was pretty close, I changed autotune back over to tune via pressure and then set my target A/F's to 11.8 or so in the boost columns of the fuel pressure map. Now out of boost, the A/F's are real good as well as when its in boost and since autotune is correcting when in boost, it will add or take away fuel when needed under boost where I felt that was more critical. It has worked well so far. It cruises around low to high 13:1 range out of boost and as soon as I lean into it a bit and start building boost (not even at WOT), the A/F's drop right down to 12:1 and below right away.
I tune via tps on auto tune first. Then I switch to auto tuning via pressure. I manually correct areas that the auto tune struggles with in boost. Then I switch back to auto tune via tps and I keep it on auto tune via tps. There are areas of the map that you are in for such a short time that auto tune doesn't seem to make necessary changes such as WOT from 3000 to 6000 rpm before you build boost. The maps overlap. Not sure what inverting the map is can you explain it a little clearer.
Basicly I am doing the same thing in 1 step. I promoted a stock rzr PCV map "stock with fac stg 2 kit" and promoted to auto tune and pressure table then sat down with a laptop and tweeked the idle fuel to a 13.5afr and used that figure for my pressure table as a static setting. So if there was no presure added a staic afr would be reached. By making this staic the boost is now load and the load can be tuned by TPS. It is simmiler to an equal and oposite reaction. The boost fuel is calculated on the pressure map and tuned on the TPS map. I was going to do exactly what you guys are I just ran out of patiance so I wanted an easyier quicker way. Buy "inverted" I mean normaly you would make a stacic tps map and add fuel and tune based on presure. I flipped those rolls around a staic presure map tune and adj fuel based in TPS. Because the presure is static the fuel needs show up in the TPS as lean or rich based on the amout of bost and TPS at the same time. This way you dont have to do the tune twice. I know it sounds wrong but it does work I have been trying to get my Packard turbo tuned since sep 2013. I now have a good base in 2days with a 1/2 tank of fuel. I did have a few issues that needed fixing in that time to so not alll of it was just tune issues. I am prety amazed at just how fuel a xp will eat at 10+psi WOT and how little at 10psi cruise.
Sounds like you have a good handle on things. I'm glad I sold my kit to someone that enjoys tuning these and understands tuning process. I hope everything is still going well.
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Sent from my iPad using My thumbs
Thanks Jadan I have been having quite a bit of fun with it. I was doing 4wheel burnouts in the road yesterday. We have been getting alot of snow lately so I have neen playin in it
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Subscribed. Just bought a kit and planning on running E85. Looking for all the E85 PCV tuning tips I can get.
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im working on m y busa with the same set up can you send me the base map to cheleniel@hotmail.com to see is i can get it work on my bike or least give me a good start base Thanks in advance
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