Boost mapping theories

[Jamo]

Gear boost reduction is done via the speed sensor so you set how fast the car is going in each gear.

Don't see the point on a 4wd car only a 2wd car

[A80Avant]

yes i was thinking of using that so that i can increase the MAP on the solenoid, and NOT have the boost on the 5th and 6th go too far overboard.

there are things to try, but in any case, the holset will be on light boost at first. When on a later date i will have the proper clutch and flywheel, we'll play around!

[Jamo]

yes i was thinking of using that so that i can increase the MAP on the solenoid, and NOT have the boost on the 5th and 6th go too far overboard.

there are things to try, but in any case, the holset will be on light boost at first. When on a later date i will have the proper clutch and flywheel, we'll play around!

I see where you going but in theory I don't know how accurate it's going to be

As you have to manually set the speed points in km/h at 5000 rpm

I was going to play with it but i'm just going with throttle based boost reduction

[A80Avant]

haha my foot is strong, always wants to put the pedal to the metal!(or carpet for that matter)

i think its a bit tricky, i agree. We'll see...

[GazzaG60]

boost control like turbos has compromise written all over it.thats one of the reasons i bought the eboost. for the gap filling where boost drops off.

what i suggest is.

wind in the duty until you hit the target boost. then adjust gate pressure (if possible, the point at which the gate starts to open) until you basically hit and hold or hit and creep slightly. springs may help you in this instance. look for around the 1.5bar mark id say. i have mine set to 1.65bar and it sweeps round nicely.

often on the bigger units you wont see full boost in first. seconds should do, maybe just. then its full boost.

also in 5th,6th the target boost will be seen lower as the engine produces more gases in the higher gears against RPM.

we used a certain motorway hill with a subaru and just planted 6th and held on. egt went fairly high but thats the toughest test it would have. carry a fire extinguisher too. that car had a little fire on one occasion. oil cooler leak onto headers. coppers just drove straight past as i was trying to rip the 4 gallon tank of chargecooler water from the boot to put it out. the extinguisher run out and still flames. a birthday cake blow did the trick in the end somehow lol.

we were lucky. wrap and oil dont mix well.

[EspenW]

Yep, that is why exhaust wrap is not such a great idea on a street car. Ceramic coat instead.

[GazzaG60]

i dont use any now on my tubes. i did at first. in all honesty no difference found.

on an impreza its really needed with tubes as they sit so close to the oil filter. renewing the wrap and coating it is the way there.

[A80Avant]

see now that im using map based boost, i possibly have no effect on the solenoid DC. So... i think im going to be using stiffer springs