Cam Choice for a 103"
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From: Baton Rouge, LA
Although it's an apples-and-oranges comparison, I actually added some ignition advance in the cruise range of my TC96 (9.2:1 compression), as the 255's have been less prone to detonation (none) than occurred with the stock cams. I incur it with 5° additional advance with the 255's, while 1° is all it took with the stockers. AFR's are the same at 14.5-14.6 in the cruise range.
Last edited by iclick; Dec 21, 2010 at 06:40 PM.
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From: Baton Rouge, LA
That's a nice-looking chart. Are you running the Stage II flat-tops (10:1) or the stock 9.6:1 pistons?
The detonation problems with the SE255 cams in 103 motors doesn't impact everyone, and is more of a problem at sea level.
here's one
same pistons. Run a .030 hg instead of the .045 stock one and you get 10:1
Well according to several..... with the early closing of the intake on the 255 cams I am getting very early compression thus detonation. I have around 10:1 comp with I understand is the top limit of the 255 cams. With the +4 gear it should move the closing of the intake out 4 degrees which would make the compression start at a later point thus hopefully getting rid of my detonation? I know some have said I should be able to tune out the detonation which I have, but my feeling is by retarding the timing drasticaly it is not the correct fix.
As far as getting it dyno tuned....... I have absolutely no faith in any of the tuners in my area. I have been tuning witht he TTS tuner, I have my fuel set and my timing I have been retarding it to control the detonation, what else is there other than the fuel and timing?
As far as getting it dyno tuned....... I have absolutely no faith in any of the tuners in my area. I have been tuning witht he TTS tuner, I have my fuel set and my timing I have been retarding it to control the detonation, what else is there other than the fuel and timing?
Last edited by Mike; Dec 21, 2010 at 07:11 PM.
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From: Highlands, NJ
THis is posted in "103 Power Package on a 2011" POST#31
Today, 06:42 AM
The following was a reply to my mentioning I was going with a TW-555. My Tuner also warned me of possible pinging isssues with the SE255's and steered me away from them.
msocko3
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Location: NE Ohio
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I think given the quality of gas now and in the future your wise choosing the TW-555 over the 255, especially in a heavy touring bike with the 103. This past year I run the SE255 in my Trike and though the torque way down low was nice the pinging when I got a hold of crummy gas while out west was not fun. I just finished installing the TW-555 and look forward to next summer once I get it tuned in the spring.
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Blue & Silver Triglide: Fuel Moto Jackpot Head Pipe, 30 Tooth Trans Sprocket, Wood TW-555 Cams, Jagg 10 Row Cooler, Tuned With TTS....
Today, 06:42 AM
The following was a reply to my mentioning I was going with a TW-555. My Tuner also warned me of possible pinging isssues with the SE255's and steered me away from them.
msocko3
Club Member
Join Date: Nov 2005
Location: NE Ohio
Posts: 2,423
I think given the quality of gas now and in the future your wise choosing the TW-555 over the 255, especially in a heavy touring bike with the 103. This past year I run the SE255 in my Trike and though the torque way down low was nice the pinging when I got a hold of crummy gas while out west was not fun. I just finished installing the TW-555 and look forward to next summer once I get it tuned in the spring.
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Red Ultra Powered By Head-Quarters
Blue & Silver Triglide: Fuel Moto Jackpot Head Pipe, 30 Tooth Trans Sprocket, Wood TW-555 Cams, Jagg 10 Row Cooler, Tuned With TTS....
Last edited by FDHOG; Dec 21, 2010 at 10:21 PM.
there's no difference between the flat top pistons in the 103 limited, the flat top pistons in the police 103 motors and the flat top pistons in the stage II kit.
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From: Baton Rouge, LA
BTW, did the tuner say anything about the dip in the TQ curve at around 3500? I would expect those cams to peak around there, but they actually peak quite a bit later. Sometimes exhaust systems can cause a dip like this. I think the 204's may be a great option for the stock 103 motor without other mods (except Stage 1 stuff), and I also put the SE255's in that category. The latter will peak earlier and won't produce as well at the top, of course, but it's all in what you want.
Last edited by iclick; Dec 22, 2010 at 11:00 AM.
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From: Baton Rouge, LA
I believe you, but we're right at sea level here and none of the Stage II's I'm acquainted with have detonation issues. It's not like I know of dozens of Stage II riders, but there are a few whose owners I've interrogated. It also gets hot here, and some of these bikes don't have oil coolers. Summertime in S. LA would be a nice time and place to test an engine for detonation, I would think. A cooler would be the first option I would install if I was riding it around here, especially if I was riding a Stage II or higher bike.