Q&A Forum
Hi guys,
I've got a MAHA LPS 2000 2WD double roller dyno that I want to convert to yourdyno. I will bring it to my premises next week.
Is a single brake version, in the manual is stated that needs 230v and it has a 16A fuse (in other manuals says needs 20A though), anyway I'm almost sure this one needs 400v three phase supply (I guess they've built different setups), so I'm thinking about switching to yourdyno power supply as well, to keep things easy while modding to run it with 220v single phase supply.
I'm just wondering how much current yourdyno power supply draw, if I can estimate it based on calculation of brake current draw at 192V.
Second question is about the rotation direction.
Because of the space, it would be best to run FWD in one verse and RWD in the opposite one, to save space behind the dyno. I know that some load cells works both in extension and compression, just swapping signal wires. But what about the rest that's involved? I mean, that rollers are not linked between "front" and rear ones and brake is fitted on "front"one, supposing vehicle tends to climb on them. Would it makes any difference while the inverted verse would supposedly push the wheel down and onto the "free" rollers? ( tyre deformation considered, of course).
Anything should tehorically impact on brake calibration on software?
Anyone tried to run its dyno both rotation verses?
@vishara-jyasekara you hav to use an HALL effect sensor for RPM measurement, so you can change the sensor, of get a small board that is used laso with standalone ECUs to give to yourdyno the correct input from a VR sensor.
Those kind of board used to be cheap, but an HALL sensor is cheaper and is faster to make it working just changing the sensor.
Modify the wheel is another business, I did it because they're like 100 teeth and they're much close, it modify it in a way that, at the end, it would be a wheel like suggested in wiki section (for teeth number, dimension, and space between teeth)
@chipg1956 I've used a S type load cell because I wanted to be able to run vehicles in both direction, plus the dyno was rated for 260kW in MAHA's datasheet, even if the brake would be capable to brake more... so I wanted to use a cell that I was sure it would be good to measure the maximum possible (for the available grip of course).
Indeed, it has just worked at 40% while measuring a 600nm/400ps vehicle (power sweep)
@chipg1956 I've used a S type load cell because I wanted to be able to run vehicles in both direction, plus the dyno was rated for 260kW in MAHA's datasheet, even if the brake would be capable to brake more... so I wanted to use a cell that I was sure it would be good to measure the maximum possible (for the available grip of course).
Indeed, it has just worked at 40% while measuring a 600nm/400ps vehicle (power sweep)
Here is the lever im using.
The spring under the lever is to compensate for its weight.
@thdyno What do you use for the lever length when calibrating? The mounting on the inside? The mounting on the frame? Or the middle of the load cell?
Thank You,
Chip
Im using the maha loadcell with yourdyno
It works perfekt🙂
Thanks! my intention is to use the same existing load cell.
Thank you so much. I just wanted to know the possibility and complexity of upgrade. According to Danny_530, it seems upgrade can be done easily. I will get a instrument box and a power supply. Before that Ill send you pics of existing VR sensors, and load cell. So far as I see all the parts are in good shape. Thanks again.
Hi danny_530,
Thank you so much for the reply and valuable advice. As you say I may have to swap RPM sensors? I am not trying to modify the RPM wheel so I need to see the possibility of VR sensor. Anyway I might need more advice from you, and Ill update you once I start the project. Thank you so much!
Im using the maha loadcell with yourdyno
It works perfekt🙂
@danny_530 Were you able to use that load cell? I have something similar and am converting a Maha/Sun emissions dyno to a small engine dyno. Chipg1956@gmail.com.
@vishara-jyasekara, the Maha LPS 2000 is a common dyno to upgrade. Not a problem! You need the instrument box and a power supply. If I remember right you need an RPM sensor too, but you can send me a pic to jostein@yourdyno.com then I can check. You can reuse the load cell if it is in good shape.