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increasing boost tune steps
Posted: Fri Mar 03, 2017 4:45 am
by ecorl
Im new to tuning so spoon feed me. I have a roots-blown, e85, MS-II application currently has a basic tune for 6 PSI at WOT that was done on a chassis dyno by a professional tuner. The MS-II is being used for fuel only! I want to change the pulley and start getting the boost up for the track. The motor has a good bottom end and with the E85 should easily take 15 PSI. My question is what is the best way to properly tune with the new pulley. Should I use VE analyze? Please give me some simple, step-by-step recommendations. Im new to this.
thanks
ed
Re: increasing boost tune steps
Posted: Fri Mar 03, 2017 3:55 pm
by kjones6039
ecorl wrote:Im new to tuning so spoon feed me. I have a roots-blown, e85, MS-II application currently has a basic tune for 6 PSI at WOT that was done on a chassis dyno by a professional tuner. The MS-II is being used for fuel only! I want to change the pulley and start getting the boost up for the track. The motor has a good bottom end and with the E85 should easily take 15 PSI. My question is what is the best way to properly tune with the new pulley. Should I use VE analyze? Please give me some simple, step-by-step recommendations. Im new to this.
thanks
ed
Perhaps a couple of questions first, Ed........ What code version are we talking here?
I want to change the pulley
Meaning?
Ken
Re: increasing boost tune steps
Posted: Wed Jun 28, 2017 4:05 am
by ms2tuning
Hi Ed,
I presume you have solved this by now .. but I will answer anyway! The small pulley will make little difference to your map at existing levels, but you need to be careful that you keep the fueling as close as possible at a given load to what it is now ... or you will need to completely remap. If you have a reasonably recent MS2 code it may be more sensible to set up switched maps .. but rather than using a physical switch (hardware) use a software switch ... kPa ... so that the fuel table will switch at say 150 kPa ... that will give you 2 tables .. fuel 1 and fuel 3 .... then leave table 1 as it is .. copy the top line of figures into the bottom line of table 3 , and set the kPa load value of that line to 150Kpa (or the same as the top line of table 1) and then put the load values on table 3 to spread between that start line up to your maximum expected boost (or usually about 20Kpa more). Guess at a value for the top line ... you should be able to get a rough idea of the extra fuel needed for each 10Kpa from the bottom table, then to start with just interpolate the whole table ... then get a wideband in the exhaust and start tuning!