I have a problem up shifting my SR3 RS 2012. When I shift its just revs and select the privious gear. For a short time the indicator flash the new gear and down again, just like dog kicks. A couple of tries and the higher gear is selected. The same issues for the next gear.
The gearbox its brand new, and it is checked 2 times more to make sure ther is no mechanicle issues inside. Gear lever sensor is changed, paddleshift loom from steering wheel new, no airleaks, valveblock checked, actuator checked, "every common problem" checked. The car is even checked and test driven by the local Radical dealer for 2 days. We cant find the issue.
ANY suggestions?
ECU related problems?
Some proportions would be VERY appreciated!
@jonasr1 Does it shift by hand? Get the rear wheels off the ground, then move the shifter on the gearbox by hand. Can you feel the detent go? Then rotate the wheels and see if it's in the higher gear. If that works easily, then you know it's the shifting mechanism, and not the gearbox. If you can't get it to shift by hand, then it's likely in the gearbox.
Hi @jonasr1, Where are you located and who did you have inspect your gear box? Also how many total hours are on your engine? The reason I ask this is because the symptoms you are describing are often a precursor to a very expensive engine failure so I would recommend proceeding with caution.
With that said it sounds like you are checking all of the right things. The actuator bushing is definitely a likely culprit as well as mechanical issues within the transmission. Have you had a look at the Life ECU data to see if the shifts are being denied by the ECU or if it is a mechanical issue?
If you are in the U.S. I would recommend reaching out to Spring Mountain to help diagnose this. If you are in Europe I would recommend contacting @rlm-dan or the Radical factory.
@charleyhradicalsportscarregistry-com
Thanks for the reply.
It is about 4 hours on the engine and gearbox. I think Radical dealer has tried a new bushing on the actuator. I have not checked the data from Life but Radical has done so. If I understood it all right, they think it looks like dog kicks on data. But when we have had the gearbox picked out, everything looks like new, which it also is. I have been driving the car for about 2 hours total and the error has gotten worse. It has occurred in the last 10 minutes. After that we checked the gearbox and it still looks new. So the error is very strange. My local Radical dealer (here in Europe) does not yet know what the error is. Some troubleshooting remains from, among other things, data from the ECU. It is very frustrating, the car is in perfect condition otherwise and also the engine and gearbox are, as I said, newly renovated so it is very sad to start the season in this way. But I hope we can solve it. Puts high hopes on this forum 🙂
Thanks for the reply.
Yes it shifts by hand. It shifts even if I spin the wheels and shift with the paddles.
Another interesting one!
Has the problem been since a rebuild or just started?
Firstly I would be looking at some basics, although it sounds like you have covered most, have you replaced/checked the airline from valve block to actuator? Can you swap it with the downshift one to see if the problem moves? Assume there are no air leaks? Air pipe tight and held into the fittings?
Checked the actuator to make that the valves are tight on the block and not loose loosing pressure? How often does your compressor run with the master on but not attempting any shifts?
Can you disconnect the actuator from the gear lever and move it back and forth freely?
After this I would be looking at the engine, is the gear shift shaft ok? This is the one behind the gear change cover that wears on a paddleshift car. If after a rebuild is the correct hear shift shaft fitted? The Gen 1 and 2 shafts are different and there have been cases of later engines with earlier shafts that won't up shift.
Feel free to send me the data to take a look but doubt I will find much if a dealer has been through it!
I dont know if this video can tell you anything...
No I do not think so. The previous owner drove the first two hours after the renovation. Then I drove two more hours. The problems have since come in the last minutes and have gotten worse and worse I would say.
Yes, airlines are checked. I mean they fit well in the actuator.
The compressor keeps the air for at least eight hours I would say.
I think it is possible to change gears easily by hand.
The gear shaft is new, the old one is in the picture. I do not know to which generation the shaft is from.
Notice the scratches on the shaft.
Problem solwed!!!
The magnet in nr39 was lose. Now when its is changed its shift perfect. Thanks for all help.
https://www.rlmracing.com/MobileProductList.php?CatType=SubCat&CatID=1041
@jonasr1, where is this part located? My SR3 had several shifts just like you are describing this past weekend.
My son who drives the car was explaining what happened and it sounded like the same thing. I was able to watch the in car video and verified what he said.
I looked at the ECU data and it is getting the shift command but it doesn't shift, then he hits it again and it goes.
I thought I would check this part to see if it might be the same issue as what you had happen but I don't see it hanging off the gearbox.
Thanks
@jclee the gear position sensor is on the backside of selector barrel and requires complete clutch removal to access.
Depending on the current engine hours, you may be dealing with an issue better suited for repair during a refresh.
@rich thanks for the clarification. We originally had a few shifting issues last year but it was just a loose bolt on the cylinder that moves the ram. It seems to be tight so it may be something else, as you say.
Thanks,
Jim Lee
my pleasure Jim. Also, linkage issues can often be the start of wear that become larger problems due to loss of intended range of motion.
Rich
