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
increasing boost tune steps
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
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kjones6039
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Re: increasing boost tune steps
Perhaps a couple of questions first, Ed........ What code version are we talking here?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
Meaning?I want to change the pulley
Ken
1979 Corvette - 383 CID SBC w/ Holley Pro-Jection 900 CFM TBI, 4-85 lb lo-z injectors & Walbro 255 pump
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
MS2 v3 w/ms2extra 3.4.0 Release
36-1, Delphi LS2/7 coils in wasted spark, driven by v2.0 logic board from JBPerformance
Spartan Lambda Sensor from 14point7
Re: increasing boost tune steps
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!
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!