I decided to put it all in one thread. After alot of time and work I think I have this figured out. Here it is simple as I can put it.
Boost cut fix= map clamp, clamped at 3-3.5v
Fuel cut fix= cdfp, either pg, cpe
spark sputter fix= NGK LTR7IX-11 (1 step colder) gapped at .030 and coil wire stretch.
Ill add one more thing that was just addressed in another thread that I overlooked and agree with completely. Replace all your hose clamps with t-bolt clamps and make sure all are tightened and sealed. Boost leaks are your enemy on all cars boosted especially maf cars.
My car has zero issues with any kind of cut/sputter right now and is pulling all the way to 6500rpms. Temps where I live is around 10-30 degrees and Im running 20+psi all day long. I hope this will help alot of people better understand what issues we are having with the car and how to fix them. Enjoy
I am just now beginning to deal with the "sputter" or high boost/RPM hesitation issue in a CX-7, so all this information is greatly appreciated. Could I ask a question or two?
How did you arrive at the voltage clamp numbers of 3-3.5v for the MAP sensor? Does the MAP sensor read from 0 to 5v, 0 to 8v? I am assuming it's the 0-5v range, but if you know differently please share that info.
As for the CX-7's problem, it started immediately after adding the 3" Quickpipe and 3" dual cat-back exhaust system by CP-E. The motor just won't pull hard in 3rd and 4th gears at WOT, it stutters, and stumbles from either a fuel cut or boost cut (maybe both), until I am forced to let off the throttle.
I have been advised by TurboSmart to use their Fuel Cut Defender 2, which I assume works similarly to the MAP clamp you're using. Are you familiar with that product?
My CX-7 has: ETS 3" TMIC, TurboSmart Dual Port BOV (recirc. mode), 5-ply boost hoses, CP-E CAI, CP-E Quickpipe & SS Dual Cat-back muffler system (3" T-304 system, no 2nd cat). It never had a stutter/stumble issue until I added the Quickpipe, eliminating the 2nd cat, and that's when the trouble began. I am installing a DashHawk tomorrow so I can have hard data on what is going on, but so far I apparently have a fuel cut issue from the MAP sensor noting over-boost from the new exhaust system's power equation role...ie the new 3" piping is allowing the turbo to spin more, and faster, and it's probably putting out 3-4 pounds extra boost, according to TurboSmart sources.
I'll know exactly what it's doing after I get the DashHawk installed.
I am running stock boost, no boost controller (yet), but the motor is apparently now putting out more than it used to do, hence the fuel cut by the MAP sensor. Do you think that I need the upgraded fuel pump, or will the problem go away with the MAP clamp?
Any advice would be greatly appreciated. Thanks!