Erbman02 wrote:

By any chance do you know what the output rating of this stator is going to be? I did ask Evan, but have yet to hear from him thru this posting. Is it going to be more than the 35 amp input rating of the rectifier. If so, then the stator will be limited to the input rating of rectifier, unless they come up with a new rectifier to match it.[/quote]

I have a 2003 so I had the rectifier/regulator limited to 18 amps and Evan sent a new one.

Clifford

Hi guys,
I'm sorry I've been so busy lately, haven't had a chance to get back on here and answer questions.
I don't have the stator power output numbers off the top of my head. I will check my data when I get to work tomorrow and post it for you guys. It is more powerful than the stock regulator/rectifier unit can handle, so we will probably be selling this as a package with our ESR440 reg/rect unit. You can see it here:
http://www.electrosport.com/products/product-detail-600.php

I promise I will post up with exact numbers tomorrow. The ESG752 stator is going to production, will probably be 2-3 months before I have them in stock and ready to go. You guys will be the first to know when they are ready!

esport_evan wrote:
probably be selling this as a package with our ESR440 reg/rect unit. You can see it here:
http://www.electrosport.com/products/product-detail-600.php

I promise I will post up with exact numbers tomorrow. The ESG752 stator is going to production, will probably be 2-3 months before I have them in stock and ready to go. You guys will be the first to know when they are ready!


Great, looking forward to seeing actual numbers. I would also like to get the input rating of the ESR440, the web site does not have it.

There was a waiting list by email is that still good

Erbman02 wrote:
esport_evan wrote:
probably be selling this as a package with our ESR440 reg/rect unit. You can see it here:
http://www.electrosport.com/products/product-detail-600.php

I promise I will post up with exact numbers tomorrow. The ESG752 stator is going to production, will probably be 2-3 months before I have them in stock and ready to go. You guys will be the first to know when they are ready!


Great, looking forward to seeing actual numbers. I would also like to get the input rating of the ESR440, the web site does not have it.

The input rating of the ESR440 is about 35A under long term conditions to be safe. This would work out to around 450W at 13V. It can handle much more dependent on airflow and cooling.
It can easily handle the output of the stock Roadstar stator, as well as the Electrosport stator. We do use 60A spec'd diodes in our rectifiers, which gives us plenty of headroom.

Yes the email waiting list is still good.
However I will post up here for sure when the parts are available.
I am going to manufacturing this week, so figure 2 months to be safe until these are available.
You guys will be the first to know!

As for power output of our part,
I tested our ESG752, as well as a stock stator in house on my test rig.
I did not have an OEM Roadstar flywheel available, and I wanted to proceed quickly to on-bike testing, so I tested with a similar diameter but weaker magnet flywheel I had in shop.
This will not give you exact numbers when used on the bike with the exact flywheel, but is close and is a good comparison test between the Electrosport stator and stock stator.

With many other bikes I have found manufacturers claimed power output be extremely generous (and often not possible at all!) and I believe this to be the case with these OEM Roadstar stators. Also, at what voltage do they claim there current rating? We do all of our testing for power output at 13VDC, which would put your battery slightly above breaking even, so just barely charging. This gives us realistic power output numbers at the critical voltage for keeping the bike running, so all the numbers I quote are at 13V DC at the battery.

From what I have seen so far, the stock stator is rated by Yamaha to be good for 21A for a 99-04 model, and 29A for a 05+ model. You might find it odd that the stock regulator is rated for 18A for 99-04 bikes (remember, this is supposed to be a 21A stator!) and 35A for the 05+ bikes (Supposed to be a 29A stator). The 18A regulator rating for the 21Amp stators is your first clue that you're never actually getting anywhere near 21Amps out of that stator!

Anyways, on to some numbers.

With this (incorrect) flywheel, I measured 210W @ 3500RPM (which I picked as freeway cruising RPM) This would mean 16A @ 13VDC. I measured a maximum of 230W output from this part at 5500+ RPM (About 17A @ 13VDC).

For the Electrosport ESG752 and the same flywheel, I measured 260W @ 3500RPM, meaning 20A @ 13VDC. I measured a maximum output of 286W at 5500RPM+, which is about 22A @ 13VDC.

So although these are not exact numbers due to the flywheel, it is a good comparison test between the two stators. Our stator begins producing power lower in the RPM range compared to the stock stator (will produce 10A @ 13V = 130W by 2000RPM), so although you may not be charging the battery at idle with your lights on, you will be breaking even.

I will try to have an OEM flywheel here when I get the parts in from my manufacturer and get you guys EXACT numbers. You can figure this to be pretty close though, and I would attribute alot of this to Yamahas extremely generous ratings on it's OEM stators!

Let me know if you have any more questions.

Evan

esport_evan wrote:


Anyways, on to some numbers.

With this (incorrect) flywheel, I measured 210W @ 3500RPM (which I picked as freeway cruising RPM) This would mean 16A @ 13VDC. I measured a maximum of 230W output from this part at 5500+ RPM (About 17A @ 13VDC).

For the Electrosport ESG752 and the same flywheel, I measured 260W @ 3500RPM, meaning 20A @ 13VDC. I measured a maximum output of 286W at 5500RPM+, which is about 22A @ 13VDC.

So although these are not exact numbers due to the flywheel, it is a good comparison test between the two stators. Our stator begins producing power lower in the RPM range compared to the stock stator (will produce 10A @ 13V = 130W by 2000RPM), so although you may not be charging the battery at idle with your lights on, you will be breaking even.

I will try to have an OEM flywheel here when I get the parts in from my manufacturer and get you guys EXACT numbers. You can figure this to be pretty close though, and I would attribute alot of this to Yamahas extremely generous ratings on it's OEM stators!

Let me know if you have any more questions.

Evan

Just some info that might help since you don't have the correct flywheel

As for stator output for both stator yrs at idle is aprox 30VAC at 2krpm 80VAC
As per service manual for 1600 stator 14v / 21A at 5000 r/min
Rectifier output no-loaded regulated 14.1vdc -14.9vdc (as per service manual)

Very rare is someone going to be cruising at 3500rpm in most cases cruise rpm is between 1800 to 2200rpm
There are also rev limiters on the ignition module:
1600.........4250rpm
1700.........4750rpm
After market ignition modules are usually set at 5k rpm, and 5500rpm on a internally built-up engine

pertinent is that a lot of us R* riders go a slow pace.
i cruise in 4th gear @ ~40MPH, which is pretty slow on the rpm.

I need an additional 250W to run heated clothing! short of shoving a 100W lightbulb up my @ss!
but it aint that part that needs heat! hands and feet are my big issue and heated grips would require thin wall gloves with a heavy backing.

i guess what we really need is a belt mounted alternator with a hi V output to run heated grips and clothing. dam it's down to 45* at night here in the NE. we really had like 2 weeks of short pants weather.

what happened to global warming? the rest of the world seemed to get all our nice summer weather!

esport_evan wrote:
Anyways, on to some numbers.

With this (incorrect) flywheel, I measured 210W @ 3500RPM (which I picked as freeway cruising RPM) This would mean 16A @ 13VDC. I measured a maximum of 230W output from this part at 5500+ RPM (About 17A @ 13VDC).

For the Electrosport ESG752 and the same flywheel, I measured 260W @ 3500RPM, meaning 20A @ 13VDC. I measured a maximum output of 286W at 5500RPM+, which is about 22A @ 13VDC.

So although these are not exact numbers due to the flywheel, it is a good comparison test between the two stators. Our stator begins producing power lower in the RPM range compared to the stock stator (will produce 10A @ 13V = 130W by 2000RPM), so although you may not be charging the battery at idle with your lights on, you will be breaking even.

I will try to have an OEM flywheel here when I get the parts in from my manufacturer and get you guys EXACT numbers. You can figure this to be pretty close though, and I would attribute alot of this to Yamahas extremely generous ratings on it's OEM stators!

Let me know if you have any more questions.

Evan

Evan, I'm guessing the stock stator you used was from an earlier 99-04 model given the very low numbers. Personally, I don't see 4amps as a huge improvement, especially when it's at an RPM well above our normal top gear cruising speed of around 2000-2200rpm.

What I'd like to see is a plotted chart showing the output from 1,000rpm up to 5500rpm measured on the bike (real world results) comparing both an OEM 05-up stator and your new stator. We all know the earlier stators were horribly inefficient, but if yours offers little to no more output than the stock 05+ unit then it's not going to be a beneficial upgrade for half the market.

Hey guys,

Sorry I've been out of the loop for awhile!
Things have been busy here at Electrosport.

I understand your questions and concerns, and thanks for the heads up on normal freeway cruising RPM.
Like I said at the beginning I don't have personal experience riding one these bikes (I've always been a sportbike guy if I'm on the street [GSX-R600 & 750!]
so the 3500RPM test was my initial guess.)

There are a couple things to point out here though.

First, I think everybody is severely overestimating the stock stator output based on Yamaha's specifications.
I have found in my testing of most OEM stators that the OEM is very liberal with there power output ratings.

I believe the stock stator I used for these numbers was from a 2001 bike.

First of all, on a completely subjective test, the guy testing the part on the bike has seen a very real and large increase in power output, in the form
of charging his battery at all RPM's while using increased lighting and accessories. While I know most of you want real numbers (which I will provide soon), take a minute
to consider those real-world results first.

Now, rather than discussing what are not real world numbers (the test results I posted above, which are NOT using the correct flywheel), here is the plan to get you guys the real deal:

I need to locate an OEM flywheel and stator from each generation of Roadstar that our ESG752 fits.

That means:

99-03 Roadstar 1600 OR
04 Roadstar 1700
Stator & Flywheel

AND

05+ Roadstar 1700
Stator & Flywheel

I will then test actual power output numbers from each stator and flywheel, even different combinations (in case the flywheels vary slightly between the 2 generations, and you mix/matched parts).
I will then test our stator power output with both flywheels, and provide you guys with all the data you could ask for.
I believe in doing so I will prove to you the generous margin Yamaha built into their power output rating for their stator.
I will also show you power output from our part, across the RPM range.

So I'd like to ask, do any of you guys have an OEM stator and/or flywheel from the bikes listed above that I can borrow for a couple days?
I can offer a 10% discount on your new ESG752 stator in exchange for letting me borrow your parts for a week!
This will speed it up greatly rather than me going to locate and buy OEM parts.

If so, please call me or email me at the below info:

Evan Grist
ofc: 760-842-8300x308
cel: 760-274-4913
evan@electrosport.com