HarleyTechTalk

Just got my bike back from having it dynoed and #s don't seem to add up, I think. 16' rg 103 w/ SE a.c., Rinehart slim line duels,  cycle ramma 575 cams. Now I had WFO Larry do stage 1+ cc set the compression with .30 gaskets at 10.25:1, doesn't look like much of a gain. Also I changed the slip on to Tab performance with zombie baffles, thoughts? Not a good tune?

 

Race my dinky 98" for pink slips? 

   cling

It don't sound right. Can you tell much difference when riding?

What gear was the pulls?

Guys, watch the scale on his sheet!!

Just shy of 95 HP and 108 ftlbs.

HP is ok, but the torque appears to be about 5 ftlbs shy.

Here is a comparison.
https://harleytechtalk.com/htt/index.php?topic=87108.msg990066#msg990066

Can't tell much difference, maybe a little touchy throttle. Don't know what gear pulled I would imagine 6th

UB, that dyno sheet didn't have any headwork I believe.

Quote from: genzer on May 15, 2019, 06:35:28 PM
UB, that dyno sheet didn't have any headwork I believe.

True, the link I put up looks like the heads were never off. The OP's engine should do better than the link I posted.

Scaling has been changed as well in the dyno sheet.  I know it don't really matter but lines crossing at 5250 makes it easier to compare to other sheets.
That one crosses over at 4550 by the looks of it.

A 2007 103 with SG decker gearing, heads (Cycle Ramma but like I'm sure Larry would do), 10.25:1, -.030 HG and a good exhaust with CR575's IMO should just break at about 105 HP and close to 115 torque (give or take dependent on climate and elevation).  I have seen one that with with the stock 07 exhaust w/ SE mufflers and with a SuperTrapp.  The stock head pipe came in a tick above both averages tunes at sea level in Florida (summer) by a known top tuner / builder (Wes) and the Super trap (disc tuned) came in a tick under the averages tuned at 1,000' in Minnesota by another good tuner in late spring.   This bike has 100 ft pounds as it crosses 2,000 rpm and quicly peaks with a flat tq line, goes like stink but admittedly starts to fall off above 5,000 rpm.

Since I became aware of this cam 5 or so years ago I have watched for other sheets and I see very similar graphs if with similar engine work etc..  This dyno may be cheap, the atmospheric conditions were off, the exhaust wasn't playing, all of the above or many other reasons.

Kd, those are the kind of numbers I was expecting, I'm hoping Darren will chime in because I pretty much copied one of his builds based on the cr 575.  I don't think the tuner knows how to go beyond a basic tune, IMHO.

One of my points is there are a number of reasons a dyno can spit out a lower reading from atmospheric to settings and more.  How does it feel is a valid question.

Feels like before the upgrades

Didn't think I'd notice 1 lb. of torque lol and that small bit of hp.

The two runs on the dyno chart are both after the engine work was done?

Too bad there was not a before run on the same dyno.

How does the motorcycle feel? There should be a very noticable improvement.

It might just be a very conservative dyno.

UB, those are before and after.

Quote from: genzer on May 16, 2019, 09:38:47 AM
UB, those are before and after.

Before and after the engine work?

Or both runs after the engine work?

My point in asking, if we are seeing a stock run versus the finished tune you definitely have an issue. If it is after the engine work and it was the start and finish of the tuning session then it may just be the result of a conservative dyno.

UB,the lower numbers run were from last year, the only things I did this this winter were the heads and changed slipons. Tuner just overlapped last year's run and current run.

Ok, you got something  wrong!

Yeah, I'm thinking it's the tuner!

I'd double check compression just to make sure something weird ain't going on there

Friend of mine runs a stage 4  and keeps yacking in my ear ..get a thundermax!

JR, I'll do that , don't know what the comp should be.

Quote from: genzer on May 16, 2019, 02:31:41 PM
JR, I'll do that , don't know what the comp should be.

Looks like around 202 psi @ sea level according to big boys calculator

There is nothing wrong, that cam is a torque variety, it's a 103.