Well, I probably know the answer already but was hoping for a 2nd opinion.
B7 A4 1.8T Quattro SE. It's been remapped from the standard 163 -> ~210.
Got a Forge 007 with a green spring. Intercooler has been replaced with a large fmic (just an eBay job but it'll do for this power).
Manual Boost Controller in parallel with n75, boost gauge, etc (just to limit boost to 15psi, was otherwise jumping to ~20psi in the mid-range)
So the issue I'm seeing is when I'm cruising at 70mph, come a bit of an incline, the boost will slowly build as the load increases to ~5psi, then it surges up to ~8psi. Then drops to 3-4psi, rinse and repeat.
It's quite annoying to be happily cruising up a hill and the car jumps on the boost then drops off over and over, like once every 2 seconds.
In an ideal world, regardless of the lag, the boost would be based on how much power I was demanding from the engine with the throttle over the whole range of travel. What I find is that the first 30% of pedal travel is all vacuum, 30-40% is the first 5psi, then 40%-42% is 8psi+, followed by 42%+ which seems to just pin the thing to near full boost until you push the pedal to the floor.
It's great that it spools quickly but the power delivery is very challenging to deal with with such a small gap in throttle position meaning the difference between pushing on and aggressively flooring it.
I have checked and the setup for the N75 + MBC is correct. They work together.
Is this just a map issue? Like the tune is just too aggressive with wanting to build boost or is there some mechanical aspect of this that needs looking at?
B7 A4 1.8T Quattro SE. It's been remapped from the standard 163 -> ~210.
Got a Forge 007 with a green spring. Intercooler has been replaced with a large fmic (just an eBay job but it'll do for this power).
Manual Boost Controller in parallel with n75, boost gauge, etc (just to limit boost to 15psi, was otherwise jumping to ~20psi in the mid-range)
So the issue I'm seeing is when I'm cruising at 70mph, come a bit of an incline, the boost will slowly build as the load increases to ~5psi, then it surges up to ~8psi. Then drops to 3-4psi, rinse and repeat.
It's quite annoying to be happily cruising up a hill and the car jumps on the boost then drops off over and over, like once every 2 seconds.
In an ideal world, regardless of the lag, the boost would be based on how much power I was demanding from the engine with the throttle over the whole range of travel. What I find is that the first 30% of pedal travel is all vacuum, 30-40% is the first 5psi, then 40%-42% is 8psi+, followed by 42%+ which seems to just pin the thing to near full boost until you push the pedal to the floor.
It's great that it spools quickly but the power delivery is very challenging to deal with with such a small gap in throttle position meaning the difference between pushing on and aggressively flooring it.
I have checked and the setup for the N75 + MBC is correct. They work together.
Is this just a map issue? Like the tune is just too aggressive with wanting to build boost or is there some mechanical aspect of this that needs looking at?
