how do you fatten up transition area ?
Is anybody running the Dobek Gen 4 box?
- Thread starter 429dhm
- Start date
how do you fatten up transition area ?
I believe you would adjust it with the red and blue . That way you can move the switch point where you want to start adding fuel . Are you sure your valves are opening at 7600 ? Is this by the pants dyno or did you visually watch them open ? Seems a little high to me . You might want to try a softer spring in the ves .
Lets try this again http://www.afrplus.com/images/GEN4_HPCurve.jpg
I just found this on the web and I have been asking them to post something for us 2 smokers . http://www.afrplus.com/Snowmobile-Pro-RMK.asp
Thanks for the links beamslayer, switching valve springs and eliminating the solenoid is a option but I fear losing gas milage or I may have to go to a pcv
rpm based controller to add at the certain rpms needed to cool when valves open and not affect my top rpms like the gen 4 does
Last edited:
No map in the gen 4 you just set you A/F and switch points and the o2 sensor does the rest . To the best of my knowledge . If the o2 sensor fails just unplug unit and ride home .
I really do not see you losing fuel mileage and if you do it will not be that much. I have not disconnected my ves solenoid to check to see how it responds but if we get snow I will be running different springs that TRS recommends . But so far this year I have ridden twice got more miles on the RZR than the Pro. Why do you want your valves opening at 7600 ?
I really do not see you losing fuel mileage and if you do it will not be that much. I have not disconnected my ves solenoid to check to see how it responds but if we get snow I will be running different springs that TRS recommends . But so far this year I have ridden twice got more miles on the RZR than the Pro. Why do you want your valves opening at 7600 ?
I agree opening the valves earlier would create more power at lower rpm, but depending how much fuel I will add in the yellow light (zone ) controls fuel between 5000 thru 7200 that could kill my fuel mileage ? how much less heat do you think the motor has at say 6500 -7000 if I get the valves to open there?
G
geo
Well-known member
When I was watching, I never saw my valves open much later than 7200, as best as I could see.
Which makes me ask, how are you determining the det spot is 7600 or valves are opening there. I tried watching and even using a capture button but both where inconclusive for me. Tach is slow, eye's are slow for me, even my thumb was "after the fact" and captured the info too late.
Which makes me ask, how are you determining the det spot is 7600 or valves are opening there. I tried watching and even using a capture button but both where inconclusive for me. Tach is slow, eye's are slow for me, even my thumb was "after the fact" and captured the info too late.
When I was checking mine I use a straw in the hole on the cap and have some one else run the throttle and watch the tach and I run along side .
Yea sorry last part is a lie I quit running the day I turned 50.
Yea sorry last part is a lie I quit running the day I turned 50.
I have my airbox self drilled 3 1 inch holes and tubes out plenum under the hood I can really hear the engine ( I really dont like it ) and cruising down trail and ease into the throttle and watch rpms climp engine sounds like bzs and soon has 7400- 7600 engine sounds like blaaa and would get hard det all the time until I added more fuel. I also have the blue/white ev springs in
G
geo
Well-known member
Maybe. The reason I was asking Is that seems high and it is not a usual spot to get the Pro det.
Do you have a can or pipe? Some times that rpm area of det is created by too tight a pipe. Almost impossible to "jet" around without getting super fat. Compounds the better you get the pump (engine) working.
Do you have a can or pipe? Some times that rpm area of det is created by too tight a pipe. Almost impossible to "jet" around without getting super fat. Compounds the better you get the pump (engine) working.
I run a thin rubber washer under mine to help with a over active det sensor .Make sure you have nothing rubbing anywhere and springs are tight on exhaust .
Ace hardware
