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Old 04-12-2008, 05:58 PM   #1 (permalink)
FNG :)
 
Join Date: Oct 2005
Location: Arkansas
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OzarkEGC wants to know Dino or Syn?
S&S IST Ignition

Anybody using one of these? I'm working on changing out my MM EFI with a carb and I'm thinking of going with the IST.

My build:
95" 10:1
HQ Heads
HQ 39g's
Super Trapp 2:1

Thanks...REL
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Old 04-12-2008, 07:00 PM   #2 (permalink)
IronButt
 
Join Date: Nov 2006
Location: red river
Posts: 134
dr dave wants to know Dino or Syn?
if you are going with a hq build, i would highly recommend going with the headquarters ignition system also - complete packages are usually far superior. i have a hq 113 build with the hq ignition and it works flawlessly so far.

i have an ist ignition in another big motor and it works well. it does not allow you to set the timing however, so if you want specific parameters, you do not have the ability to set them. basically the system takes over and you may sacrifice a small hp or tq number (if dyno'ed), but it does work well to reduce or eliminate pinging, etc. it is good supposedly if you change exhausts, air intake systems, or get a lesser quality tank of gas - it adjusts on its own to reduce possible detonation, pinging, etc.
in my particular build, i think it is retarding the timing a little too much and may be making the motor run a little hotter - not sure yet, but suspect i will try another programmable ignition just to see if there is a difference.
very advanced unit that probably works very well - again if you are not looking for extreme variations from the systems basic designed timing parameters.
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Old 04-13-2008, 09:53 AM   #3 (permalink)
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Location: LINY
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Quote:
Originally Posted by OzarkEGC View Post
Anybody using one of these? I'm working on changing out my MM EFI with a carb and I'm thinking of going with the IST.

My build:
95" 10:1
HQ Heads
HQ 39g's
Super Trapp 2:1

Thanks...REL
I am using it on my 01 flh and its been good. power feels strong.
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Old 04-14-2008, 01:50 PM   #4 (permalink)
IronButt
 
Join Date: Dec 2004
Location: nc mountains
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hardluk1 wants to know Dino or Syn?
I had a spark knock problem on a 95" build when i let the shop(kendall Johnson) talk me into to much comp and cam for my bagger and could not tune out the ping when rideing in the nc mountains and even after haveing the dynatec ign. remaped at the factory i desided to try the ist, it had just come out for the 05's then and it work'd great,great.I had a 585 cam with a cranking pressure of 200 and this made the bike perform well. I did no tuneing ,just bolt it in and rode. Dyno showed a bit stronger bottom end and midrange with the ist. and no more ping. This is one of those learning curves we all go threw in life.
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Old 04-15-2008, 03:07 PM   #5 (permalink)
155" R&R TwinCam
 
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Join Date: Mar 2007
Location: Windham,Maine
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The best thing about the IST is you can change a lot of things and the computer adjusts the timing,to keep the motor just outside the pinging.Giving all the advance allowed.It also adjusts to your riding style.Mine is 5 yrs and working great.Knock on wood!
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