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(Post Link) post #1 of 10 Old 19-07-12 Thread Starter
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Overboost management JTD EDC15

I Have fitted a GTB2056 on a JTD 8v, and now I am working on pressure management by ecu.

I have find 3 overbbost map in my file and 2 threshold map for open-closed loop control.

846.658.ori.9_jtd_2003

077032 1st DC pierburg map
077330 2nd DC pierburg map
077800 3rd DC pierburg map

076F94 1st threshold map
076FC0 2nd threshold map

I think tha under 1sr threshold map map ecu is working in open loop with 1st DC pierburg map, over 2nd threshold map ecu is working in open loop with 3rd pierburg map, and between the threshold map ecu is working in closed loop...

I'am right? Can you help me?
Do you know how are working this maps?
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open loop VNT duty cycle setpoint, economical
open loop VNT duty cycle setpoint, sporty
open loop VNT duty cycle setpoint, transient

fuel qty for VNT closed loop switch on
fuel qty for VNT closed loop switch off
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Suppose your car has wastegated turbo originally and not the VNT controlled as the open loop maps don't seem to be initialised properly (except of the transient one)?
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It works that way:

if fuel injection raises over the closed loop switch-on limit, VNT duty cycle becomes under PID control (another three P, I, D maps, each doubled)
if fuel injection lowers under closed loop switch-off limit, VNT duty cycle becomes under open loop setpoint map control

economical open loop setpoint map is used in general
if you hit the accelerator pedal hard or rev over some rpm limit, sporty open loop map is used for some time
transient open loop map is used during the gear shifting
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(Post Link) post #5 of 10 Old 21-07-12 Thread Starter
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Yes, my car is originally wastegated...

By now, if I have understand,

If I want to increase fast response in gear shifting I had to increase the 3rd map : 077800

And for sporty driving is use always the 2nd map: 077330 ?

It's possible that in my file isn't enabled sporty drive? There is a bit to enable sporty drive?
Also in turbo map, the sporty turbo map is zero.

Last edited by carisiogolf; 21-07-12 at 12:31.
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Quote:
Originally Posted by carisiogolf View Post
If I want to increase fast response in gear shifting I had to increase the 3rd map : 077800
yes

Quote:
And for sporty driving is use always the 2nd map: 077330 ?
yes, but bear in mind this mode is triggered by user request. So far I have found speed of accelerator pedal pressing and engine rpm trigger

Quote:
It's possible that in my file isn't enabled sporty drive? Theree is a bit to enable sporty drive?
Also in turbo map, the sporty turbo map is zero.
Yes, evidently. So far I have seen sporty mode being enabled only on EDC15C7 Alfas. But I'm not sure if it's enough to setup the vnt/turbo maps and triggers, or it's needed to enable also some switch.
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(Post Link) post #7 of 10 Old 21-07-12 Thread Starter
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Therefore, my only hope, I have to manage everything with the first map:077032 ?

Or your advice is to work in full closed loop?
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Well, i got the problem that my Turbo spool very slow to maximum pressure after remap.
Ive got an Fiat Stilo 1,9 JTD 8V 115PS
i have the stock turbo and an Alfa Mito Map sensor.
if i push the accelator pedal my turbo pressure climb up slowly, i remember that this can happen much faster.
so which map i need to modify to spool up the Turbo much faster?
so i have these 3 maps, too
and what does closed loop mean?
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(Post Link) post #9 of 10 Old 16-12-12 Thread Starter
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Quote:
Originally Posted by Mordi View Post
Well, i got the problem that my Turbo spool very slow to maximum pressure after remap.
Ive got an Fiat Stilo 1,9 JTD 8V 115PS
i have the stock turbo and an Alfa Mito Map sensor.
if i push the accelator pedal my turbo pressure climb up slowly, i remember that this can happen much faster.
so which map i need to modify to spool up the Turbo much faster?
so i have these 3 maps, too
and what does closed loop mean?
The map sensor from alfa mito is a 3bar sensor?
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So i mean this one 0 281 002 566 from bosch. Plug an play with mod it into ecu ;-)
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