Factory Denso 180 Amp Alternator upgrade

sub'd

 

Finally moving forward on this again. Pricing on the Sienna 27060-OP420 has come down to earth... new units can now be purchased from Toyota for a pinch over $300! Nice. I also have another Japanese built alternator of higher build quality to check out.

 

No surprise, the big body 180 amp alternator bolts right up.


Here's the stock 120 amp vs the larger 180 amp.

 

Sooo... a wiggle and a waggle, and done? Or are the little differences killers...

 

There are differences, I do not consider them killers. I will cover them shortly.

 

Nobody has found an amp vs pulley rpm plot or chart for either the original or the bigger alternator, right?

 

No charts yet.

 

Really wish we could get some data to know what the current budget is at various rpm (without doing a big test sequence...)

Repair manuals 10 years ago seemed to always have some data for it...

 

the alt is variable voltage and electronically regulated; so, there is no set amount of amperage output at certain rpm’s.

 

Agreed (ECU controller at least is highly variable, I assume no logic in alternator)
But from glancing at the pulley size and alternator size we also know that the maximum possible is going to be alot less than nameplate rating at idle.

You are right, to actually know what we can expect would require a very careful test on the truck, with variable engine speed, temperature, etc...
In lieu of that, it would be nice to have at least a max output curve for the alternator alone.... (at least then we would have an upper bound)

 

Denso usually rates their amperage hot. My best guesses on output, at this point, are based mostly on the vehicles in which they are installed. The Mexico produced unit is installed on the top of the line Sienna Mini Van w/ 2GR FKS. The higher priced Japan built unit is for the RX 350 L w/ 2GR FKS, which is the extended length 3 row. Both of these vehicles have large power requirements at lower RPM

I do have one chart for Denso's Poweredge 170 alternator. It appears to be the same size architecture/chassis, and description of components reads very similar or the same as the Toyota units. FWIW...

 

Nice, wow
Thanks

 

Pulley info will be deleted shortly! Bad cross reference showed 6 rib on some of the larger alternators. These alternators should come with a 7 rib belt. NO PULLEY SWAP!

 

Any chance you could pop the cover off one of the regulators and see what the chip inside says? No idea if that is even possible, but it would be interesting to know. For things like dual battery systems, the biggest issue is not the amp rating of the alternator, but the ECU control that dials back the output voltage. If we know which version of the LIN protocol these alternators are using, it may be possible to over ride the ECU control and dial in whatever output you want.

 

Unfortunately no, the regulator is potted.

 

That is kind of what I figured. Can probably still figure it out by listening in on the LIN bus, but it will be a bit more work.

 

OVTune suggested a long time ago that he had found how to adjust the output voltage in the ecu, not many people cared about it.

 

@Rome604

 

Yes you can adjust output with the Ovtune vftuner! I have made my adjustments using the ovtune vftuner works great charging output is i have it set to max at 14.5 volts will float up and down with temps from 14.3 to 14.5 i can go up or down with those adjustments but battery is holding strong in the mid 14's been using the AGM settings for 6 months or more and have no issue's!

 

What did you end up having to modify to get this to work and how difficult was it? I wasn't blessed with the tow package and am thinking if I'm going to upgrade to the 130A, I might as well go to 180A, as a winch is in the near future.