Nissan 370Z Forum - View Single Post - GT Motorsports: 370Z Supercharger system development

1slow370 · 03-01-2010, 12:31 AM

Sorry got a little muddled posting about both kits at once. A few pages back i asked you if you had changed out the stock MAP sensor and you had said no, being blow-through you have no way of gauging the mass of the air in the manifold then so you must have almost rewritten the tunning tables of the car as from like 3000rpm to redline the map would be maxed out. You have a blow through set up so you wouldn't have to worry about using a blow off valve as the pressure would dip below the max range of the map sensor and the engine would have all the information it would need again. The thing with not using an upgraded MAP sensor and an extended table is that any time the motor is over 1 psi it will only be able to reference a single line on any table referencing load so the motor will be running off of maybe 6 cells of the maps for fuel and igniton when ever it is under boost instead of having the full map to work from. wether you would be at 8 psi or at 2 the motor would only know it has over 1. Which is why i keep asking if you upgraded the damn map sensor or not.

Stillen on the other hand has gone the other route of draw through so even if the pressure is off it is measuring the flow of the air at atmospheric through the MAF sensor so it can calculate the mass of the air off of that and correct the way the engine runs with the maf meter tables. which through the GTM system would also be damn near maxed out when under boost, as the amount of air flowing through the sensor would remain the same only it's density would be increasing constantly. stillen would have a problem if they ran an open blow off valve as the metered air would be disappearing. The gtm kit relies on not metering anything and just telling the motor how much air it should have (unless you upgraded that MAP sensor) as they have taken a N/A car retained all the stock sensors(unless they upgraded) and the car is in no way designed to read pressures over atmospheric in that stock form unless you move sensors around like stillen has.

03-01-2010, 12:31 AM	#1359 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	Sorry got a little muddled posting about both kits at once. A few pages back i asked you if you had changed out the stock MAP sensor and you had said no, being blow-through you have no way of gauging the mass of the air in the manifold then so you must have almost rewritten the tunning tables of the car as from like 3000rpm to redline the map would be maxed out. You have a blow through set up so you wouldn't have to worry about using a blow off valve as the pressure would dip below the max range of the map sensor and the engine would have all the information it would need again. The thing with not using an upgraded MAP sensor and an extended table is that any time the motor is over 1 psi it will only be able to reference a single line on any table referencing load so the motor will be running off of maybe 6 cells of the maps for fuel and igniton when ever it is under boost instead of having the full map to work from. wether you would be at 8 psi or at 2 the motor would only know it has over 1. Which is why i keep asking if you upgraded the damn map sensor or not. Stillen on the other hand has gone the other route of draw through so even if the pressure is off it is measuring the flow of the air at atmospheric through the MAF sensor so it can calculate the mass of the air off of that and correct the way the engine runs with the maf meter tables. which through the GTM system would also be damn near maxed out when under boost, as the amount of air flowing through the sensor would remain the same only it's density would be increasing constantly. stillen would have a problem if they ran an open blow off valve as the metered air would be disappearing. The gtm kit relies on not metering anything and just telling the motor how much air it should have (unless you upgraded that MAP sensor) as they have taken a N/A car retained all the stock sensors(unless they upgraded) and the car is in no way designed to read pressures over atmospheric in that stock form unless you move sensors around like stillen has. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50