Low Power, Hesitation and DEFAP Question!

[rlees85]

Right after putting the new plastic vac box on the car has been 1000% better! but after driving it around for a while it still doesnt feel quite right and not ready for the remap yet... (btw NO engine light!)

The issues are:

Barely any power in 1st and 2nd, especially when engine isn't quite upto 90C
Barely any power after 3500RPM, ever.
Noticeable hesitation when changing up a gear, or just accelerating in general (feels like excessive turbo-lag).
Sometimes pulls like a train once it gets going, other times more like a pony...

I know turbos 'do' lag but not like this, I have to be careful when overtaking or entering roundabouts etc as I have to plan for a good second or two of no power before it'll jump forward...

Anyway, took it for a drive with PP2000 to see what I could uncover...

TPS(APP) only reads 79% when my foot is flat, but if I operate it manually in the engine bay it reads 99%. Is that normal?
MAF readings look fine...
Turbo Actual/Turbo Expected are normally about right. It takes the turbo actual a long time to get to the value expected sometimes which seems to corrospond with the turbo lag I'm having. I also notice it can jump over the expected value under very harsh driving (ie, expects 2100MBAR it can jump to an actual pressure of 2200MBAR for a split second before levelling at the expected value). How does that sound?

I am also getting a brake switch error code on PP2000: (brakeerror.png) dont know how relevant that is...

Now the DEFAP thing, I uploaded a defap map which was created using my original ECU file, to my ECU, and the next day took it to a garage for actual DPF and CAT removal. Now I am getting a cat temp sensor error. I thought the de-fap map turned that lot off? or has the garage unplugged an electrical connector they shouldn't have? (caterror.png)

Thanks all

[Doggy]

To try & answer these in order.....

Less power with coolant temp < 70 deg. is normal as the intercooler is bypassed during warm up.
Can't swear to it, but less power in 1st appears normal too, 2nd should be OK though.
On a std ecu map, it will run out of puff around 3500-3700. Re-mapped it will barely tail off until the red line.
I have occasionally experienced the excess turbo lag feeling you describe, but not often. My best guess is it's likley to be another vacuum issue, difficult to diagnose unless it's there constantly.
TPS should reach 100% or thereabouts, you may need to adjust the cable. Take care, it's important to ensure it still reliably reads 0 when not pressed.

Can't really comment on monitoring live data while driving, but it sounds OK, a little bit of boost control overshoot is almost inevitable, IMO.

The cat upstream sensor is wired to the engine ecu, the downstream to the additive ecu, for some reason. Since defapping mine, both indicate 751 degrees or thereabouts, hot or cold, wirth checking what yours says. Mine are still connected electrically and I suspect you may get a fault if the upstream one is not plugged in. I note yours is an intermittent fault code, have you cleared it? Does it come back?

[rlees85]

Ahh... good to hear a lot of it is normal at least. Ill perhaps investigate the vac system some more and check all the EVs then next. going to do away with that knitted sock thing and replace it with something better too and check the rest of the intake system for boost leaks whilst im at it...

well spotted on that cat fault being intermittant. i didnt notice that! i have cleared all the codes and i'll see what happens.

thanks!

that pp2000 really is awesome btw. even managed to turn off the hazards under sharp breaking (track day use)