boost lag and fuel economy question

[slim100s4]

Have you replaced the lambda sensor that's also another thing I have changed in the past.

[hunker7]

Have you replaced the lambda sensor that's also another thing I have changed in the past.

I had a low milage "universal" Denso lambda from my V6 which I fitted, didn't change a thing.

[slim100s4]

Sounds like you have covered all the basic stuff. Mite be worth having the emissions checked sounds like it could be connected with your power loss problem have you ever done a boost leak check on it.

[hunker7]

I'm wondering, is it possible that G4/G28 gives signal to the ECU but at slightly wrong time?

[Dift]

As above, brim to brim I get around 31-32 per tank (mostly motorway driving).

Boost sounds ok, although it does sound like it comes on late in fourth.

It doesn't sound like limp mode if your still getting full boost.

[hunker7]

As above, brim to brim I get around 31-32 per tank (mostly motorway driving).

Boost sounds ok, although it does sound like it comes on late in fourth.

It doesn't sound like limp mode if your still getting full boost.

It boosts fine, and when it does it shifts like hell, but it's just that it only kicks in at 3000 and above.

[Dift]

My RS2 turbo builds boost a fraction before 3000, with full boost not long after. My stock turbo would be on boost at 2500rpm.

Sounds there is an issue somewhere. Do you have a boost gauge?

[hunker7]

My RS2 turbo builds boost a fraction before 3000, with full boost not long after. My stock turbo would be on boost at 2500rpm.

Sounds there is an issue somewhere. Do you have a boost gauge?

By "on boost" you mean full boost? At 2500 mine only starts boosting basically my 7000 is much laggier than your 7200 and you get more at the end of it

I don't know, I'm using dash one. I don't think I get higher than 1.5 around town at any time under normal driving.

[Dift]

On boost I mean building boost, sorry.
Stock turbo should be building boost at 2500.

[hunker7]

Mine is chipped so I'd expect it to come little earlier. Because if you say starts building at 2500 then mine is like that, but then takes upto 4000 to be on full boost.

[newsh]

Disconnect the N75 and see if it's different.

[hunker7]

Disconnect the N75 and see if it's different.

Just the plug? Wouldn't that limit it to 1.4 ish bar?

[newsh]

Should do, just to check it behaves normally

[newsh]

Have you still got the stock chipset?

[hunker7]

I will unplug it on my way home, and yeah I got them