Tuning Rb3 in Mountians

[Sibola]

I'm not real sure mine is mounted outside as well. But I think it should be mounted in the intercooler myself. Once the s/c is done passing the air through it, compressing it. The air would be warmer right(friction creates heat) so only make sense that the sensor is reading what the engine is seeing.

But with that said, the rb3 should have you running richer right. Like I said before new to all this new technolgy boost, 4-stroke, rb3. But thats what I like figuring #*$&@ out and making it work.

 

[mulot30th]

I would like someone who have experience in tuning with rb3 at many elevations how do they get away with that problem?

 

[herby]

i've been told by mpi and powderlites that the airbox sensor should be in the intercooler as well as the IAC.

 

[mulot30th]

i've been told by mpi and powderlites that the airbox sensor should be in the intercooler as well as the IAC.

in fact the only sensor on airbox is... IAT....


so I think I will have to tap the intercooler the that sensor...

not too bad and if that can solve my problem... will see next time I ride in BC

 

[JIM]

this is a good topic? should it see any engine heat?? mine is below my intercooler a few inches and above the motor mounted to the delta box. should it be mounted back by the relays?

 

[mulot30th]

this is a good topic? should it see any engine heat?? mine is below my intercooler a few inches and above the motor mounted to the delta box. should it be mounted back by the relays?

mine is about the same place and its not correctly compensating altitude changes (over 5000' differences that I am talking here)

 

[herby]

my sled's a nytro and the IAC is the bigger line that comes somewhere underneath the intercooler from the throttle bodies. not sure if the apex has this too but it should be run into the intercooler too. i used 1/2 inch heater hose and welded a fitting onto intercooler.

 

[JIM]

well if you want to talk automotive, the map sensor on a ford diesel it on the ac/heater box along ways from the engine heat. I am thinking the sensor should not see engine heat or see any falling snow through the hood to cool it down. I was talking to dave and he mentioned in the management- signal pickup there is a some setting there for sensitivity. I lowered mine to the minimum and it didnt fix my spitting at 5500, but it may fix your alltitude issue.

 

[t_thall]

a MAP sensor just measures the manifold pressure and can be mounted wherever and long as it is plumbed to the pressurized side of the intake. If the IAT sensor is measuring the -20'C air outside and your compressed air in the intercooler is +50'C your computer is gonna be a long ways off with its fuel adjustments.

 

[t_thall]

Also it should be mounted on the engine side of the cooler as that is what the engine will be seeing. If you look at most automotive they are mounted either right before the throttle body or built into the Mass Air Flow sensor which is also just before the throttle body.

 

[mbarryracing]

Better verify if the stock IAT sensor is pressure resistant. It's intended application was in a plastic airbox with ambient atmospheric air pressure, not elevated boost pressure. Not sure how that could affect the internals or blow it apart?

 

[mulot30th]

Better verify if the stock IAT sensor is pressure resistant. It's intended application was in a plastic airbox with ambient atmospheric air pressure, not elevated boost pressure. Not sure how that could affect the internals or blow it apart?

woops did not though about that..

but someone said powderlites recommend installing it on intercooler?

SO I assume this has been validated before?

 

[mbarryracing]

Don't know for sure. The IAT is just zip tied to the hoop on my FPP Apex and I have no driveability issues so far.

Thinking about it though, if it were in the intercooler and sensed the hotter charge temps when on the boost hard then the ECU would react accordingly. But what is it's reaction? Pull timing and fuel for the less dense air (hotter)?

I'd probably rather have it run richer under boost (hotter air then it senses) then the other way around...

 

[mulot30th]

Dont get me wrong, the sled rips when... its run in the sale elevation range (+ or - 2000ft) that is was tuned....


but as soon as I got more than 3500- ft change... everything started to get off... and got worse the more we climbed.

 

[mbarryracing]

Our sleds are being driven in very different enviroments. I'm in the flatlands around 900-1600 feet so that might be a big difference, I don't change elevation that drastic?
Besides the IAT is a temp sensor not an atmospheric pressure (MAP) sensor so shouldn't have any impact on elevation?