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what pressure is anyone who is running any 270 hp tune seeing

DMCTurbo said:
I swear by megabites, 3rd year on mine and haven't bent one yet. Sharpen them up every offseason. The key is not spinning the track in rocks etc... like you mentioned.
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I been using megabites on all our sleds for the last 10 years!! They been extremely durable!!
I bought the biteharder stud sharpener and works well
 

max spool 16 sm with 3 bar and turbo smart.......17.5-17.7 today according to my data log
 
justinator said:
max spool 16 sm with 3 bar and turbo smart.......17.5-17.7 today according to my data log
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Thanks Justin,what area of maine do you ride mostly,and where do you live? Thanks Pete
 
snowbeast said:
Thanks Justin,what area of maine do you ride mostly,and where do you live? Thanks Pete
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I live in fort kent and usually ride with my wife in this area and the surrounding towns.
 
Motorhead said:
My stock 2 bar sensors would not read that high. 3 bar reads up to 18 or so accurately, next step would be the 4 bar for higher boost tunes I think you will find.

Some very interesting reading on here concerning adding headers, and why your boost readings go down but power goes up.
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3 bar should be able to read 29ish no?
 
Does a 3 bar sensor more accurately read boost so the cpu can adjust things like fuel and timing more accurately thus producing more hp? From what I have read the 2 bar is done @ 15psi. Not sure what happens to fuel flow and timing after 15 psi on the 2 bar.
 
fourload said:
Does a 3 bar sensor more accurately read boost so the cpu can adjust things like fuel and timing more accurately thus producing more hp? From what I have read the 2 bar is done @ 15psi. Not sure what happens to fuel flow and timing after 15 psi on the 2 bar.
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Yes, from what I understand the 3 bar allows them to accurately adjust fuel timing etc. to match the boost, allowing them to push the boost a little bit further on the 3 bar version of that tune versus the 2bar. I think they calibrate a safety margin for the 2 bar sensor (rich)over 15 to 16 PSI but not as accurate and dialed in as 3 bar is what I understand
 
When I was researching the difference between the Max Spool 16 2 bar and the Max Spool 16 3 bar, it was pretty vague.
But I was told that the 2 bar does not allow for accurate fueling at 16 or lower, so yes they compensated by simply over fueling, whereas the 3 bar can read boost up to 18 accurately, thus it fuels cleaner at that tunes ultra high level.
At that time you could go shopping online at the TD site and on some of the bigger tunes require a 4 bar tune, for much the same reading. I thought it stated you needed a 4 bar sensor for over 18, but that is by memory so I shall try and find that again, whereas it seems my memory may need an updated sensor now!

Not all 2 bars are limited exactly it may seem. My 2 bar tune never saw more then 16.1 with 15.8 or 9 being more the norm. Now with the 3 bar I see the full boost in the 17s. But another reported much higher readings with his 2 bar Max Spool 16. So sensors may vary a bit I am guessing!
 
Motorhead said:
When I was researching the difference between the Max Spool 16 2 bar and the Max Spool 16 3 bar, it was pretty vague.
But I was told that the 2 bar does not allow for accurate fueling at 16 or lower, so yes they compensated by simply over fueling, whereas the 3 bar can read boost up to 18 accurately, thus it fuels cleaner at that tunes ultra high level.
At that time you could go shopping online at the TD site and on some of the bigger tunes require a 4 bar tune, for much the same reading. I thought it stated you needed a 4 bar sensor for over 18, but that is by memory so I shall try and find that again, whereas it seems my memory may need an updated sensor now!

Not all 2 bars are limited exactly it may seem. My 2 bar tune never saw more then 16.1 with 15.8 or 9 being more the norm. Now with the 3 bar I see the full boost in the 17s. But another reported much higher readings with his 2 bar Max Spool 16. So sensors may vary a bit I am guessing!
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Just on the TD site, punched in 3 bar map sensor and it states that it is needed for 17 and over. They use that same 3 bar for the 330 race tune but do not give it’s limit. Cannot find a 4 bar on that site at all so you guys are correct. Big Phil it can read up to 29 huh! It has been a while since I researched the map sensors, maybe the mention of a 4 bar was on the Hurricane website.. not that it makes a diff for me because I am staying where I am at tune wise. But somewhere wher3 it was sold explained the limits of all map sensors, 2-3 and 4 which I had never heard of.
 
I can tell you my 2 bar read 16.6 multiple times last weekend while testing.

Yes, the 3 bar will read higher and provide more accuracy. My reasoning for sticking with the stock sensor was because I had read about a bad batch of GAP 3 bar map sensors. The last thing I want, is another thing to worry about while riding my YamaCat.

I only trail ride, so pegging my stock sensor at 16.8 will be a rare occurance. I also checked with TD, and they indicated that the stock sensor is fine, as long as I wasn't planning on adding more power than Max Spool 16.
 
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