power / dyno runs

[Crasm]

Everything i have ever read about the standard gs is that it produces 47bhp.
My question is ive been looking at some dyno results saying that with a full performance exhaust , lunchbox filter and rejet its only producing around 43bhp??

I take it the standard 47bhp is taken from the fly wheel and not the back wheel??
And i guess the mentioned modded bike with 43bhp dyno results was taken at the back wheel??
If its 43 bhp at the back wheel what does that equate to at the fly wheel??

Im curious because i plan to get my bike dynoed once its jetted up and want to understand it

Cheers

[Jayke]

From what I've heard, that's at the crank or something. More realistically 35-44hp or so at the wheel depending on the mods and age of the bike. At least that's how I think it is.

Sent from my C6903 using Tapatalk

[dinkydonuts]

I thought the GS was rated at around 55HP at the crank?

[Suzuki Stevo]

I thought the GS was rated at around 55HP at the crank?

Closer to 40 HP if you ask my butt dyno 

[Mauricio]

Tad under 40 when stock. Didn't anyone tell you GS is an abbreviation for "Go Slow"?

[Suzuki Stevo]

Tad under 40 when stock. Didn't anyone tell you GS is an abbreviation for "Go Slow"?

Is that at the crank or RWHP?

[Jayke]

Tad under 40 when stock. Didn't anyone tell you GS is an abbreviation for "Go Slow"?

Is that at the crank or RWHP?

Id imagine at the wheel, as there are many sources saying 47bhp, which will be at the crank.

[gsJack]

Published road tests:

http://www.gs500.net/gallery/data/500/GS500tests.jpg

Friends 02:

http://www.gs500.net/gallery/data/500/MikesGS500dynoRuns.jpg

Annies modified GS (John's  wife):

http://www.gs500.net/gallery/data/500/AnniesGS500dynoRun.jpg

[Crasm]

So 47 @ the crank which equates to roughly 36 @ the wheel
So for instance of the last link above if 43 is produced at the wheel its roughly 55 @ the crank
Which is an 8 bhp increase on the stock 47 bhp

[Suzuki Stevo]

So 47 @ the crank which equates to roughly 36 @ the wheel
So for instance of the last link above if 43 is produced at the wheel its roughly 55 @ the crank
Which is an 8 bhp increase on the stock 47 bhp

Getting an 8 Hp increase with a filter, pipe, and jetting is wishful thinking, half that I might believe.

[radodrill]

So 47 @ the crank which equates to roughly 36 @ the wheel
So for instance of the last link above if 43 is produced at the wheel its roughly 55 @ the crank
Which is an 8 bhp increase on the stock 47 bhp

Getting an 8 Hp increase with a filter, pipe, and jetting is wishful thinking, half that I might believe.

The Ninja 500R is speced at 49.9 rwhp.  I don't think that the water cooling and 4 valves per cylinder account for the power difference compared to the GS500.

Also, from experience, with the stock pipe and K&N drop-in I went up 5 sizes on the main and it had way more power.

[Suzuki Stevo]

The Ninja 500R is speced at 49.9 rwhp.  I don't think that the water cooling and 4 valves per cylinder account for the power difference compared to the GS500.

Also, from experience, with the stock pipe and K&N drop-in I went up 5 sizes on the main and it had way more power.

The Ninja 500R can be pumped more right out of the box because of the water cooling, and it is also 498 cc, the 4 valves can't hurt either. Add a K&N, jetting, and full exhaust system to a GS500 and I would still put my money on the bone stock Ninja 500R in a drag race 

None of it really matters as long as your having fun on two wheels!

http://www.mcnews.com/mcn/model_eval/NinjaGScomparo07a.pdf

[Crasm]

Ill let u no what i get when i take in for dynoing in 3 or 4 weeks time. Not really looking forward to it the last time i was there i ran a 152 bhp on my old cbr1000.
Why i didnt buy a 600 or 1200 bandit to comute on is beyond me . . .
Positives are i have two wheels just as spring is starting here in the uk
I think spring 2015 will see me upgrade to maybe another supersport or an sv650
Just need to get this thing running sweet for summer

[Mauricio]

The Ninja 500R is speced at 49.9 rwhp.  I don't think that the water cooling and 4 valves per cylinder account for the power difference compared to the GS500.

Also, from experience, with the stock pipe and K&N drop-in I went up 5 sizes on the main and it had way more power.

Water cooling on the EX500 motor allows for higher compression. A stock EX500 mill has a 10.8:1 compression ratio, GS500 motor is 9.0:1. It also breathes better because it has a larger valve area with the 4-valve heads.

[radodrill]

The Ninja 500R can be pumped more right out of the box because of the water cooling, and it is also 498 cc, the 4 valves can't hurt either. Add a K&N, jetting, and full exhaust system to a GS500 and I would still put my money on the bone stock Ninja 500R in a drag race 

None of it really matters as long as your having fun on two wheels!

http://www.mcnews.com/mcn/model_eval/NinjaGScomparo07a.pdf

Looking at that link, their discussion and dyno charts show that when stock they pull similarly under 6K rpm and over that the GS goes flat while the EX keeps pulling hard.  That is exactly what I felt when I first got the GS.  The EX250 I had before that pulled hard from ~4K up to redline; so I had expected the same behavior from the GS (and better top speed).  I can say for a fact that doing just a rejet and filter gave it a bit more on the bottom end and way more on the top; she now pulls really hard all the way up to the redline.

TBH, I wouldn't be surprised that an optimally rejetted GS would run about the same as the stock EX500.  With the new exhaust I feel she has even more power and I still haven't hit the limit as I've been stepping up the main and am not to the point or running rich.

I would be interested in getting mine on a dyno, but the only place in town that does it charges a lot and requires a min 3hr session.

[Suzuki Stevo]

TBH, I wouldn't be surprised that an optimally rejetted GS would run about the same as the stock EX500.  With the new exhaust I feel she has even more power and I still haven't hit the limit as I've been stepping up the main and am not to the point or running rich.

You are never going to find the 12 Hp it would take to do it, knowing Harry Potter might help 

[gsJack]

+1 Steve

Stock GS has about 40 HP and stock EX500 has about 50 HP and that is the way it is.  Way back in 89 V&H worked over a GS500 modifying intake, exhaust, and jetting plus boring for Wiseco pistons to increase displacement and some porting work.  They only claimed a 10% increase in HP and Torque but it showed a noticeable increase in performance on the top end as well as the 0-60 mph.  Included on my list of published road tests.

http://www.gs500.net/gallery/data/500/GS500tests.jpg

If you do a good job on intake, exhaust, and jetting you get about 10% like V&H got and John got with Annies bike way back when.  My thoughts on stock GSs, my 02 when like new with 3 circuit carbs felt stronger all around thru the mid range than my old 97 GS with old carbs did but the 97 with 80k miles on the clock still felt stronger on the top end than the 02 with only 4k on it riding them back to back on the same day.  Always thought a cam change must have been involved too but have never confirmed it one way or the other.

[radodrill]

If I were closer to west Seattle, I'd visit the bike cave to get a first hand comparison.

All I can say is that I jetted larger than The Buddha would have, I feel a power increase overall with a buttload more on the top end, she launches waaaayyy better, and now she's a blast to ride.

[Suzuki Stevo]

When I bought my GS I knew all about the EX500, I still went with the GS500F for a number of reasons, I was only slightly disappointed with it's Hp/performance even after jetting (stock pipe, airbox). I bought it right before the GSX650F became available in the USA. I ended up getting a '08 GSX650F in Nov of '08 also, that is really the driving reason I sold my '07 GS500F. If I had a bigger garage I would have kept the 500 also, but with 7 bikes at the time..the 500 became odd man out, and it wasn't easy to let it go. The GS500 is a great platform to learn to work on bikes, mod the hell out of it and have the time of your life, just remember if you go to trade it at a dealer,  they don't care how much money you have tied up in extras HP/mods. After 25+ bikes I learned that anything beyond a slip-on and a K&N is better spent on a different bike if your looking for any real performance gains.

CCPDYMMV   

Yes I know it's not a dyno pull from a GS500, my GSXF makes 72.95 RWHP after tweaking the fuel map with a laptop computer, this didn't help my GS500 keep a spot in the garage either.

[Mauricio]

After 25+ bikes I learned that anything beyond a slip-on and a K&N is better spent on a different bike if your looking for any real performance gains.

WORD.