turbojonn
Registered
O.K. I've had this bike for a year now. To make a super long story short, I've replaced tons of stuff. It's a Mr. Turbo system and by todays standards is fairly antiquated. It has an FMU that is ufo like in shape with a set nut for fuel pressure adjustment and a set screw for rising rate adjustment. It has an external mechanical wastegate and a Rajay turbo (standard issue with Mr. Turbo).
At the dyno-shootout yesterday it first popped the intake off and then on the second run it popped like it was lean on top so I had the guy stop ritght away. It's had a rich problem below 3500 since I've owned it and it seems as though the last attempt at fixing it didn't do the trick (new stator, rctifier, wiring harness). Now, since the last fix, it would appear as though it is lean on top. The rich low end is one thing to deal with, the lean on top problem is a much bigger issue. If I would have let the dyno guy hammmer the bike I thnk it would have melted.
I have set up a loose appoinment with the only guy in our area that has a good rep. for tuning with a dyno. The pc2 is leaned out on the bottoem and full rich (35) on top. The thing is that I'd love to take it to someone who knows turbo Busas specifically. Further, if I have a hopeless system and I'm beating a dead horse I'd want to know. The turbo has no loose play side to side but it doesn't spin like a top. It's a bit sticky and I don't know if this is normal for old style Rajays or if mine is gummed up and causing some of this low end richness. I also don't know if I need to get a boost activated/controlled fmu. (I'm editing this part- I'm pretty sure it is boost activated). The more I learn about what my bike has for a system the more doubtfull I am that it will ever be able to not burn itself up or stumble down low.
The fuel pressure is (and was) set at 42 but I don't know where it goes when the boost hits. The boost was set at 15-18 prior to the last round of work and the bike did not lean out on top, now it does. My little bit of knowledge about turbos (which ain't much) tells me to turn down the fuel pressue when the bike is at idle until it runs well and then turn up the rising rate rate to get the pressure on top?? My common sense tells me to ask the two of you if either of you want to take a crack at it. I'm not asking for anything free. Just asking if this bike an it's misbehaving sounds like a problem you could fix or a gremlin type issue or a forget it and get new parts issue or a part it out and buy one that works isuue. I think I've used up all of the locals knowledge and need to move to the next level. Hellllpppppp!
<!--EDIT|turbojonn
Reason for Edit: "fme IS boost activated (I think)"|1147879633 -->
At the dyno-shootout yesterday it first popped the intake off and then on the second run it popped like it was lean on top so I had the guy stop ritght away. It's had a rich problem below 3500 since I've owned it and it seems as though the last attempt at fixing it didn't do the trick (new stator, rctifier, wiring harness). Now, since the last fix, it would appear as though it is lean on top. The rich low end is one thing to deal with, the lean on top problem is a much bigger issue. If I would have let the dyno guy hammmer the bike I thnk it would have melted.
I have set up a loose appoinment with the only guy in our area that has a good rep. for tuning with a dyno. The pc2 is leaned out on the bottoem and full rich (35) on top. The thing is that I'd love to take it to someone who knows turbo Busas specifically. Further, if I have a hopeless system and I'm beating a dead horse I'd want to know. The turbo has no loose play side to side but it doesn't spin like a top. It's a bit sticky and I don't know if this is normal for old style Rajays or if mine is gummed up and causing some of this low end richness. I also don't know if I need to get a boost activated/controlled fmu. (I'm editing this part- I'm pretty sure it is boost activated). The more I learn about what my bike has for a system the more doubtfull I am that it will ever be able to not burn itself up or stumble down low.
The fuel pressure is (and was) set at 42 but I don't know where it goes when the boost hits. The boost was set at 15-18 prior to the last round of work and the bike did not lean out on top, now it does. My little bit of knowledge about turbos (which ain't much) tells me to turn down the fuel pressue when the bike is at idle until it runs well and then turn up the rising rate rate to get the pressure on top?? My common sense tells me to ask the two of you if either of you want to take a crack at it. I'm not asking for anything free. Just asking if this bike an it's misbehaving sounds like a problem you could fix or a gremlin type issue or a forget it and get new parts issue or a part it out and buy one that works isuue. I think I've used up all of the locals knowledge and need to move to the next level. Hellllpppppp!
<!--EDIT|turbojonn
Reason for Edit: "fme IS boost activated (I think)"|1147879633 -->
