Has anyone ran into this with a race gas push turbo kit?
Between 4500rpm and 6000rpm, if I hold a steady light throttle, say 1/4 throttle, the sled cruises for a second or two, then dies almost like someone hit the kill switch. During this time, the AFR goes very lean. Before it completely dies, it picks back up, runs normal for a second, and then dies again. This cycle of AFR going normal (14.5:1) and then very lean keeps repeating itself until I give it more gas or let off the throttle. The sled idles fine, and anything outside of that 1/4 throttle, 4500 to 6000rpm range, it runs perfectly.
Things I have done:
1. It was doing this with the old fuel controller (power commander V, with the aux injector powercommander box). I could not tune this lean/rich steady cruise out.
2. I changed the fuel controller to a 3D race gas boondocker box. Sled runs 100% better everywhere else (than it did with the powercommander), but still dies suddenly at cruise and goes very lean, then going into the cycle described above.
3. I have replaced the TPS, thinking that the old TPS may have a "dead" spot.
4. I have set the new TPS to .69V at idle. I have tried other TPS settings, as low as .5v and as high as .8V and it did not have any affect on the issue, just made the sled run crappy everywhere else.
5. I have disconnected the throttle microswitch, thinking at light throttle, the switch may have been flickering between on and off, causing it to have the issues it is having. This made no difference.
6. Fuel pressure is 39psi at idle. It is the factory push electronic fuel pressure box. The fuel pressure gauge is under the hood, so I cannot see what the fuel is doing when the sled is having this issue.
7. I did a Compression ratio test and both cylinders are identical and well within factory specs.
8. I was told that an overly rich situation with tons of unburned fuel could cause the AFR to read lean, so I tried leaning out the midrange on the boondocker box. It ran much worse.
9. I currently have the 5000rpm and the 6800rpm settings on the boondocker box for the low and mid throttle positions set at +15. It makes the situation a bit better, but it is still very much there. Plus, I can tell it is rich as it gets boggy in the midrange with these settings.
It runs so good everywhere except this one spot, that I can't see it being anything serious, or things like reeds, fuel pump, ECU, etc.
I am at a complete loss, trying everything and replacing everything that I could think of that would fix this problem.
Anyone every see anything like this before? Anyone have any other suggestions?
I snapped my jackshaft in Revy last week 1hr into the ride and ended up renting a Doo and a Poo. I liked the doo so much that if I can't get this fixed, I'm selling it for a doo. So please help before I move over to the dark side
Between 4500rpm and 6000rpm, if I hold a steady light throttle, say 1/4 throttle, the sled cruises for a second or two, then dies almost like someone hit the kill switch. During this time, the AFR goes very lean. Before it completely dies, it picks back up, runs normal for a second, and then dies again. This cycle of AFR going normal (14.5:1) and then very lean keeps repeating itself until I give it more gas or let off the throttle. The sled idles fine, and anything outside of that 1/4 throttle, 4500 to 6000rpm range, it runs perfectly.
Things I have done:
1. It was doing this with the old fuel controller (power commander V, with the aux injector powercommander box). I could not tune this lean/rich steady cruise out.
2. I changed the fuel controller to a 3D race gas boondocker box. Sled runs 100% better everywhere else (than it did with the powercommander), but still dies suddenly at cruise and goes very lean, then going into the cycle described above.
3. I have replaced the TPS, thinking that the old TPS may have a "dead" spot.
4. I have set the new TPS to .69V at idle. I have tried other TPS settings, as low as .5v and as high as .8V and it did not have any affect on the issue, just made the sled run crappy everywhere else.
5. I have disconnected the throttle microswitch, thinking at light throttle, the switch may have been flickering between on and off, causing it to have the issues it is having. This made no difference.
6. Fuel pressure is 39psi at idle. It is the factory push electronic fuel pressure box. The fuel pressure gauge is under the hood, so I cannot see what the fuel is doing when the sled is having this issue.
7. I did a Compression ratio test and both cylinders are identical and well within factory specs.
8. I was told that an overly rich situation with tons of unburned fuel could cause the AFR to read lean, so I tried leaning out the midrange on the boondocker box. It ran much worse.
9. I currently have the 5000rpm and the 6800rpm settings on the boondocker box for the low and mid throttle positions set at +15. It makes the situation a bit better, but it is still very much there. Plus, I can tell it is rich as it gets boggy in the midrange with these settings.
It runs so good everywhere except this one spot, that I can't see it being anything serious, or things like reeds, fuel pump, ECU, etc.
I am at a complete loss, trying everything and replacing everything that I could think of that would fix this problem.
Anyone every see anything like this before? Anyone have any other suggestions?
I snapped my jackshaft in Revy last week 1hr into the ride and ended up renting a Doo and a Poo. I liked the doo so much that if I can't get this fixed, I'm selling it for a doo. So please help before I move over to the dark side
