dyno tune question
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6th Gear
Joined: Aug 2012
Posts: 11
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From: Wisconsin
dyno tune question
I got a 2012 Street Glide with Rinehart Duals along with an upgraded A/C. Im having a harley shop install a stage II with Andrews 57H cams. I have this scheduled to be done in a week and decided to have it dyno tuned by them. Is this the smartest choice for getting the best outcome out of the cam upgrade? I'm starting to second guess my choice of having it dynoed from what I've read? I'm open to all thoughts or suggestions.
Also what are you using for a tuner?
Last edited by sanman4ever; May 29, 2014 at 11:15 AM.
Ultimate HDF Member
Joined: May 2008
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From: 'Noke, VA
Assuming you've found yourself a good dyno operator, you have nothing to worry about. No sense in spending a bunch of money on a build and not getting every bit of performance out of it.
FWIW, the people who refer to dyno tuning as "abusive" or only think that it matters at WOT don't know what they're talking about.
FWIW, the people who refer to dyno tuning as "abusive" or only think that it matters at WOT don't know what they're talking about.
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6th Gear
Joined: Aug 2012
Posts: 11
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From: Wisconsin
I have the Screaming Eagle super race tuner for the bike from the exhaust and a/c install. I read for an upgrade of just cams that don't require different springs or head work.. (bolt-in cam) a dyno could be a waste of money and hard on the engine. I don't necessarily totally agree with that. I'm not worried about the cost end of it, just want to get the best outcome. The service manager at the HD shop didn't even suggest a dyno test to me, I had to request it.
Outstanding HDF Member
Joined: Jan 2007
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From: Naples FL / Pine TWP PA
As long as your choice of dyno tuner knows what they are doing you can't go wrong getting the bike tuned properly. Just make certain the guy knows what he is doing. There are guys that work magic on a dyno, guys that are ok, and guys that the power should be turned off. Check around with people that have used the service you are planning to use. The tune is ok is probably a red flag, or a lot of justification on why the bike behaves a certain way... All you should hear is yeah money well spent the bike runs great.
Ultimate HDF Member
Joined: May 2008
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From: 'Noke, VA
I have the Screaming Eagle super race tuner for the bike from the exhaust and a/c install. I read for an upgrade of just cams that don't require different springs or head work.. (bolt-in cam) a dyno could be a waste of money and hard on the engine. I don't necessarily totally agree with that. I'm not worried about the cost end of it, just want to get the best outcome. The service manager at the HD shop didn't even suggest a dyno test to me, I had to request it.
No, no, no, no.
You don't want a dyno "test", you want the bike tuned with the dyno.
And there is nothing hard on the engine about running it on a dyno.
And a cam change is significant. That radically changes airflow through the engine and will radically change the fuel and timing needs.
Cruiser
Joined: Mar 2014
Posts: 242
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From: South Florida
Im confused...
a dyno is NOT hard on the engine at all...
cam change? you need a dyno tune... period.
a dyno is NOT hard on the engine at all...
cam change? you need a dyno tune... period.
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6th Gear
Joined: Aug 2012
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From: Wisconsin
From what you all have said, I'm just going to stick with my original plan and have it tuned to the dyno run. I'll be sure to ask the questions necessary to what I expect out of the bike. I know I want printed copies of the bikes dyno runs (pre and post cam install) along with air flow numbers. Any other important things to ask for?
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Adding cams without a tune is like like ordering a salad with no dressing. A dyno tune is well worth it assuming your guy is a good tuner. That is how you get an accurate tune for your bike. You can get a different map from someone but it is unlikely that the bike will run nearly as well with a map off a different bike. I have never had an issue as a result of having a bike dynoed. The only thing was it ran great afterwards.
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Joined: Jan 2007
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From: Naples FL / Pine TWP PA
No, you can tune the bike yourself with TTS or Power Vision but it's a lot of work to get it dialed in and you really need to understand how the ECM and fuel injection work to dial things in. There are a lot of us that have done it with outstanding results. That being said it is best for most people to just put the bike on a dyno and have it tuned.