Track bike battery/starter delete - Suzuki GSX-R Motorcycle Forums Gixxer.com
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post #1 of 16 (permalink) Old 04-10-2017, 08:38 PM Thread Starter
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Track bike battery/starter delete

Brand new to this, 10 minutes ago, so bear with me here...

I have been building a track bike out of my 1987 gsxr 750 for about 3 years now to race AHRMA. I have the ambition to eliminate as much weight as I can and the battery and starter come to mind... I am concerned with the correct way to do this (I can handle the mechanics of this just fine) , but I don't want to ruin any of my other electronics, which at this point consist of alternator, ignition and tach.

Looking for information on the safest and lightest way to achieve this. The mechanics of starting the bike I've got worked out and I'm not concerned with. I'm not familiar enough with the electrics/electronics to feel comfortable making this change with out first hand info, thanks!


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Last edited by mike3684; 04-10-2017 at 10:17 PM.
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post #2 of 16 (permalink) Old 04-10-2017, 11:26 PM
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Re: Track bike battery/starter delete

Quote:
Originally Posted by mike3684 View Post
Brand new to this, 10 minutes ago, so bear with me here...

I have been building a track bike out of my 1987 gsxr 750 for about 3 years now to race AHRMA. I have the ambition to eliminate as much weight as I can and the battery and starter come to mind... I am concerned with the correct way to do this (I can handle the mechanics of this just fine) , but I don't want to ruin any of my other electronics, which at this point consist of alternator, ignition and tach.

Looking for information on the safest and lightest way to achieve this. The mechanics of starting the bike I've got worked out and I'm not concerned with. I'm not familiar enough with the electrics/electronics to feel comfortable making this change with out first hand info, thanks!


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The new "Ballistic" batteries weigh basically nothing, and keep their charge excellent. My new battery is about 5lbs lighter than my Yuasa I had.
Personally, I wouldnt remove the starter or the battery.
With a superlight battery and keeping the starter, I cant imagine that weight saving doing more for you than simply improving your rider skill.
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post #3 of 16 (permalink) Old 04-12-2017, 02:43 PM
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Re: Track bike battery/starter delete

As an AHRMA Next Gen racer on a 1987 GSXR, I'd recommend leaving the starter on and removing the alternator to run total loss. If you ran the lighter battery and removed the alternator that's easily 15-20 pounds and you still have the luxury of a thumb start. Making it light won't make up for the 38 hp we are giving up to the Ducati's so make it easy on yourself.
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post #4 of 16 (permalink) Old 04-16-2017, 08:28 PM
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Re: Track bike battery/starter delete

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As an AHRMA Next Gen racer on a 1987 GSXR, I'd recommend leaving the starter on and removing the alternator to run total loss. If you ran the lighter battery and removed the alternator that's easily 15-20 pounds and you still have the luxury of a thumb start. Making it light won't make up for the 38 hp we are giving up to the Ducati's so make it easy on yourself.
outsider,

are you running your first gen without the alternator?

mike,

i just fitted a WPS Lithium Ion battery on my first gen, because i wanted to do away with the acid leaks, and save weight. wow, the Li-Ion battery is less than 2 pounds! keep us informed of your progress and post some fotos.

also, how will you start the engine without the starter?
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post #5 of 16 (permalink) Old 04-17-2017, 11:11 AM Thread Starter
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Re: Track bike battery/starter delete

I've read good things about these antigravity battery's, but they do state on their site that they have a lesser capacity than a Lead battery (kind of assumed that). They also have a 12oz claimed weight, which I particularly like. Anybody have input on these? Will a full charge on a total loss system get me a full race with a battery like that? Also I have a Solo Start was just gunna use that to crank the engine... I'll see if I can get some pics soon, gunna lay up some glass race weight fairings too so I'll get those in the pics...


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post #6 of 16 (permalink) Old 04-20-2017, 08:49 AM
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Re: Track bike battery/starter delete

I can't imagine that you wouldn't get a full race distance from just about any battery. Yoshimura used to use a Furukawa battery FT4L-12B-R lead acid battery with a capacity of 3Ah. I'm more familiar with Shorai batteries and they have a half dozen basic case sizes, with capacities up to 21Ah. I think their smallest one has a capacity that is more than double what Yosh used to use. Note that they had several batteries for each bike, so they could swap them out for each session while the others recharged. Thus was born the side-mounted battery boxes, to make the change easier and faster.

JR
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post #7 of 16 (permalink) Old 04-22-2017, 11:14 PM
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Re: Track bike battery/starter delete

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Originally Posted by 86gixxxer View Post
outsider,

are you running your first gen without the alternator?

mike,

i just fitted a WPS Lithium Ion battery on my first gen, because i wanted to do away with the acid leaks, and save weight. wow, the Li-Ion battery is less than 2 pounds! keep us informed of your progress and post some fotos.

also, how will you start the engine without the starter?
Yes, I've got APE alternator block off plates on all 3 of my first gen race bikes. Been running them that way for the last 16 years. Battery last about 3 years, that includes a few wal mart specials.
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post #8 of 16 (permalink) Old 04-24-2017, 10:11 PM
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Re: Track bike battery/starter delete

sorry for the thread hack, but just to confirm/clarify;

outsider, you are running your track-only first gens without the alternator, and the batteries last for the race/session? what do you mean by total loss?

i think i have an alternator block-off plate stashed somewhere, so i'd like to go your route.

thanks
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post #9 of 16 (permalink) Old 04-24-2017, 10:21 PM Thread Starter
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Track bike battery/starter delete

Total loss means it's only used by the machine and not replenished... the alternator converts the mechanical energy back into the electrical energy used by the systems, in this case its like fuel, bring what you need and that's it (at least, I think that's what you mean)... idk why I never considered this before but the more I ponder it the better it sounds... thanks again for the input!


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post #10 of 16 (permalink) Old 04-25-2017, 01:01 AM
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Re: Track bike battery/starter delete

Mike, I'm about to do the same on my slingshot. APE block off cover, a lithium battery of your liking (I use Full Spectrum Power) and a dedicated charger - put a pigtail on the battery and you can plug it in between sessions. Keep the starter ditch the alternator like Eric said. You can still start it on the button and it will save a bunch of weight.
I was pitted with a buddy on a ZX7R all weekend and he has that exact setup on his bike. No prob running 20 min sessions all day let alone 8 lap Next Gen races and starting on the button every time. He plugs it in between sessions for peace of mind.
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post #11 of 16 (permalink) Old 04-25-2017, 08:51 PM
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Re: Track bike battery/starter delete

I normally run a three way pigtail on my generator, two for warmers and one for a battery tender. I've done about 40-50 laps at a track day before it started fading. When racing or practicing, I also just plug it in to keep it hot. Do the conversion, take it to a track day and see how long it lasts. I also have a K model ZX7R with full factory kitted motor, It runs total loss and no starter, on the hot days or wet days the last thing you want to mess with is bump starting the bike. LOL
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post #12 of 16 (permalink) Old 04-25-2017, 08:52 PM
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Re: Track bike battery/starter delete

forgot to add that 3 of my race bikes have the battery pigtail which makes plugging them in super easy. The other has an easy remove seat so no worries.
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post #13 of 16 (permalink) Old 04-26-2017, 11:34 PM
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Re: Track bike battery/starter delete

sweet, thanks for the replies!

i figured the battery would last a 20 min session, so now, i'll just charge the battery between sessions. time to look for the alternator block off plate.

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post #14 of 16 (permalink) Old 05-17-2017, 06:33 PM
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Re: Track bike battery/starter delete

Did you ever get this figured out? I had posted a whole thread on constant loss as well as a schematic for the wiring a while back for both first and 2nd gens. You could probably find it if you search my name and "harness."
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post #15 of 16 (permalink) Old 05-17-2017, 06:43 PM Thread Starter
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Re: Track bike battery/starter delete

No haven't actually tackled it yet, but I'll definitely check it out! Thanks!


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post #16 of 16 (permalink) Old 05-17-2017, 06:50 PM
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Re: Track bike battery/starter delete

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Originally Posted by mike3684 View Post
No haven't actually tackled it yet, but I'll definitely check it out! Thanks!


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No problem. PM me if you need help.
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