jcgemt2003 said:
Yeah, actually I do have a boost gauge and no, not all of these cars are holding boost well into high rpms. it redlines at 7000rpm so if you have a boost gauge and look at it while you accelerate you would no that after you reach a certain rpm (Way more noticable at higher speeds) (my car does at least)your gonna start to loose boost. Ive probably read 15 other posts of people with the stock ms6 smart ass that all say the same thing,(WE LOSE BOOST AT 5500rpm)! OH and I never said I think I loose boost, I know I do....I have video shot by someone sittn behind me and we analyzed it for about an hour! Oh and one other thing....In 4th gear between 87-95mph my boost gradually declines to 12psi and holds there till 100mph. Theres some info for ya so bla...bla...bla....
Even if your losing boost, or past peak, you cant forget about gearing, Or the Power band, Get a Dyno graph for the car (Doesnt have to be yours, just a stock base line pull. With that you will be able to better pin point where to shift.
Ill give an example
My Protege LX makes peak torque arround 4000rpm, and peak hp arround 6000rpm.
The hp however doesnt plumit at 6000rpm, it does curve down untill arround 7000rpm where it falls off the chart.
When Drag racing, I shift arround 6800rpm (In the red line) doing this, allows for the most pull in that gear & sets up the rpms better for the next gear.
I get 15.9 in the 1/4 with an intake/exhaust/header.
& Im N/A making 0 boost.
I went out to get a Dyno graph of the MS6 so we can check it out. I couldnt find a stock baseline, but I found one with only an intake, thats it.
According to this graph...
Looking at it, Im suprised there is a 7000rpm red line, as power PLUMITS before getting to that point. Arround 6600rpm there is next to no power being made at all. The car must feel like crap when higher then 6200rpm's when STOCK.
After looking at this I would be shifting arround 6200rpm
with only an Intake or stock (we wont see HUGE differences from only an intake).
HOWEVER!!!!
With a Intake, BOV and Catback as you say your holding boost longer (to arround 6200rpm over 5500rpm), this will push that shift point a little higher, more like 6600rpm's. That will need be confirmed on a Dyno, however If you hold boost untill 6200rpms, its certain to have more power at that point then where as a more stock set up boost falls arround 5500rpm.
So with your set up I would shift arround 6600rpm's BUT I would get a Dyno done to confirm where the NEW fall point in the graph is anyways.