transponder mounting

If you're renting a transponder, the instructions sheet is pretty snazzy and includes guidance on lemonesque mounting. Bring your zipties and a drill bit big enough to make holes to pass 2 ties.

In general, renting or not, anywhere on the car is fine as long as it's 'pointed' down, there's no metal in the way, and it's within 2 feet or so of the ground. If you have a spare tire well in the trunk, one of the vertical-ish walls of that is a great place.

At North Dallas Hooptie we mounted the rented transponder behind the front bumper to the sheet metal so if was definitely <2ft off of the ground and had a clear shot at the ground below it. At the end of Saturday Jay and the gang pulled our driver in and told him they were getting a "weak" signal from the transponder. I don't think we lost any laps because of it, but we remounted it to the inside of the front sheet metal but lower on the car (worried about debris hitting it), probably around 10-12" off the ground and never heard any more about it. The relative transponder strength may be related to how the loop is installed at the track as well.

The provided instructions recommend mounting the transponder to the outside of the spare wheel well. Reasonably well protected there for sure, but for us it was a pain to get to (not to mention beam axle and fuel tank issues).

Does anybody have a picture of the transponder?  I'm trying to figure out the mounting for ours. too.  Having an idea of what they looked like would give me a good idea of the space and hardware I need to mount the thing

FWIW, at ECR the rental ones were yellow TranX 160's, look pretty much identical  except they are yellow and are supposedly "karting" transponders, but they seem to work just fine so long as you don't get them too far off the ground and don't have anything but a clear path to the tarmac below. We mounted ours on the inside of a radiator support.

Nah, it's a plain square box with one obvious fastener hole.

It would be pretty easy for them to adapt their mold so that it would have slots on the vertical sides to facilitate zip-ties. They should do that, it wouldn't even interfere with their dedicated mount (which is made with slots that facilitate zip-ties). AMB is certainly well aware of the outfits that buy and rent their transponders. Hmm.

It is my understanding that the AMB model numbers are the speed (in kph) at which you will get hits 100% of the time.  So they have yellow tran-x 160 @ 100 mph, red tran-x 260 @160mph.  I guess they figure that no Lemons car will be going 100mph+ halfway down the straight!