ESE's works engine tuner

[F5 Dave]

Theoretically behind, but with one small caliper & small forks & wheels it probably doesn't matter a squat.

[TZ350]

The peak power shown at the dyno curves link from above show a peak power of 128 bhp or is this not the Darcy pipe?

http://homepage.mac.com/rg500delta/d...cy%20test1.jpg

Yes I think the black line is the Darcy pipe, but 128 bhp? I thought it was more like 170 SAE Hp measured at the back wheel, I know there is many different coloured horses, what with SAE, Metric, Brake, Hp Etc., have I missed something?

I have not given up on the RS pipe, I think it has real potential but need more time to make some spacers like you sugested and I was thinking of a sliding mid section too for testing on the dyno.

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[sonic_v]

Yes I think the black line is the Darcy pipe, but 128 bhp? I thought it was more like 170 SAE Hp measured at the back wheel, I know there is many different coloured horses, what with SAE, Metric, Brake, Hp Etc., have I missed something?

I have not given up on the RS pipe, I think it has real potential but need more time to make some spacers like you sugested and I was thinking of a sliding mid section too for testing on the dyno.

.

Black line is torque - 66 ft-lbs

[gav]

170 rwhp? From an RG500? Not even the full factory GP bikes were making that were they?

[TZ350]

Black line is torque - 66 ft-lbs

Ok so the lower three traces are rwhp, at 170 I did have my hopes up for at least a low 20's rwhp pipe for my bike.

I am expecting to get to the dyno this afternoon, it will be interesting to see how the Darcy pipe goes.

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[sonic_v]

Ok so the lower three traces are rwhp, at 170 I did have my hopes up for at least a low 20's rwhp pipe for my bike.

I am expecting to get to the dyno this afternoon, it will be interesting to see how the Darcy pipe goes.

.

Your bike is well capable of 24/25 bhp. It is all in the pipe!!

On a positive note, the rg500 is giving about 32bhp per cylinder at 10500 revs/min. As this is the sort of revs you want to peak at, you are able to take a significant drop in torque and still make 25 bhp.

PS I think that you should investigate an earlier closing point for the disc valve at some stage! 85 is quite extreme and as your intake now flows better than before it should in theory require a milder closing point

[TZ350]

I think that you should investigate an earlier closing point for the disc valve at some stage! 85 is quite extreme and as your intake now flows better than before it should in theory require a milder closing point

Yes plan to do this, will try a series of them, but interestingly the 85 doesn't spit back and it drives (up the drive) on the throtle quite well.

Your bike is well capable of 24/25 bhp. It is all in the pipe!!

On a positive note, the rg500 is giving about 32bhp per cylinder at 10500 revs/min. As this is the sort of revs you want to peak at, you are able to take a significant drop in torque and still make 25 bhp.

Thats encouraging, I think I should be able to get mid 20's rwhp out of the GP125 too. I chose to make a copy of the Darcy pipe as it was developed on an engine similar to mine and proven in dyno test comparisons with other well known after market pipes.

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[ajturbo]

170 rwhp? From an RG500? Not even the full factory GP bikes were making that were they?

my buell (XB ) does....

[ajturbo]

Theoretically behind, but with one small caliper & small forks & wheels it probably doesn't matter a squat.

thanks... didn't think it would make too much difference.. just a question...

[speedpro]

There's news to be shared but for some reason Rob's not sharing. Cully may enlighten us as long as we promise not to accuse him of showing off.

[Buckets4Me]

is this good or bad
even I havent heard yet
sounds like the 100 is the fastest E.S.E bike around

[TZ350]

There's news to be shared but for some reason Rob's not sharing. Cully may enlighten us as long as we promise not to accuse him of showing off.

Yesssssss.....Ok....choke....cough....splutter..... Cullys bike has more power than mine and looks better on the dyno graphs.

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[TZ350]

is this good or bad
even I havent heard yet
sounds like the 100 is the fastest E.S.E bike around

Testing with the Darcy pipe, best results, max power (21 rwhp) at 9,000rpm mid section temp 80deg C, cylinder temp 90 and head 60.

Optimized the jetting and tried retarding the ignition, and got more heat less power, advancing the ignition, same result, more heat less power.

It beats me how my new engine which has more port/time/area than the old one, and with the same RM pipe as my previous 11,000rpm engine now makes slightly more max power but at only 9,000rpm.

I have tried pipes optimized for 10,11 and 12,000rpm on it but it always made much the same 21 rwhp at about 9,000 rpm, with the high power/rpm RS pipe being the best.

Although the new motor is making a little more power than before, its as if, just as its getting well into its stride something chokes its potential, the suspects are the transfers or the exhaust port.

The good thing is in back to back comparisons with others the diffuser carb worked best.

The plan is to reduce the inlet closing point, make some spacers for the RS pipe and re-measure the port/time/areas, make some changes and hopefully back to the dyno next week.

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[Chambers]

I'm not going to crow as time has been the problem with TZ and once we get a handle on whats going on I'll be expecting 26 rwhp my 100 was done as a comparision of Open Carb 100 as aposed to restricted 125. Watch this space!

[Buckets4Me]

so for a years work you have gone from 14 hp and third at the Taupo gp
to 21hp and who knows where at the gp this year

so a 50% increase in HP this year
and Rick may have to watch out. No on the start line this year