4k boost/ignition cut

[Richy200]

Morning,

Wondering if anyone could help?

I have a problem with the 850R where she gets to 4k and it hits like a limiter and I can go no further. Tbh I back off as soon as it bangs on it once.
I've been told the map as had the boost cut removed but still has a maf limit in place. Could it be that I need a new maf?
She still pulls strong if you stay at half throttle and let the auto box change itself at 3/3.5k and with plenty of boost but this problem is frustrating :(

Any help?
Thanks

[T5frankie]

try it with the standard ecu, it may have something to do with it being colder now

[Richy200]

Good shout I will do :)

[Richy200]

Standard ecu pulls her through the rev range no problem at all.

So I'm stuck how to resolve the issue :(

[claymore]

sell that ecu to someone with a 15g and get a HLM 304 for yours, you could also try winding off the wastegate actuator a couple of turns.

[T5frankie]

sell that ecu to someone with a 15g and get a HLM 304 for yours, you could also try winding off the wastegate actuator a couple of turns.

the actuator is already wound off loads

[Richy200]

And it still makes mental boost!! How did it ever work when it wasn't wound down?
It's on the standard ecu so in theory could it be turned up as it's painfully slow now.

[T5frankie]

And it still makes mental boost!! How did it ever work when it wasn't wound down?
It's on the standard ecu so in theory could it be turned up as it's painfully slow now.

on the standard ecu the boost should be halfway into the white part of the gauge

[Richy200]

Yeah it's just above half way on the positive side but just feels so gutless :(

[T5frankie]

Yeah it's just above half way on the positive side but just feels so gutless :(
if its above halfway then you need to put it so its below halfway then put the mapped ecu back in

[Richy200]

Ok I'll give it a shot today :)

[Richy200]

Wound it down 2 1/2 turns and it pulls through the revs now

[T5frankie]

Wound it down 2 1/2 turns and it pulls through the revs now

what would you do without me eh? lol

[Richy200]

Not have this car! Lol and be stuck with a 4k fuel cut. Haha

[woz]

Wound it down 2 1/2 turns and it pulls through the revs now

I think there is a moral to this story about having a chip programmed to manage boost differently then fiddling with the boost manually as well.

I was clearly told by Hamish when he did my RICA not to fiddle with the actuator 'cos it would no longer benefit and would interfere with the benefits of the RICA s/ware.

Not entirely sure I believed it ..... until I read this thread!!!

WOz:>0

[claymore]

I think there is a moral to this story about having a chip programmed to manage boost differently then fiddling with the boost manually as well.

I was clearly told by Hamish when he did my RICA not to fiddle with the actuator 'cos it would no longer benefit and would interfere with the benefits of the RICA s/ware.

Not entirely sure I believed it ..... until I read this thread!!!

WOz:>0
That's not strictly what's happening here, the map on the car was specifically designd for a 15g turbo, but this car has an 18t turbo.

[Richy200]

Yeah I wouldn't play with the actuator on a map set for the right turbo however as above the turbo is bigger than the map was designed for it needed tweaking.

Shame as I'd love to see this make proper boost :(

[T5frankie]

Yeah I wouldn't play with the actuator on a map set for the right turbo however as above the turbo is bigger than the map was designed for it needed tweaking.

Shame as I'd love to see this make proper boost :(

with a forged engine that map would be mental

[Richy200]

Don't put ideas in my head!

[glock19]

Why do you need more boost ? I'm on a 19t myself which I can make it go to 1.6 bars (either thru mapping or AVC-R) but it's not faster than when it was 1.2bars. Ever heard of boost surge ? When the system (intercooler, manifold) is having such a high pressure, compressor speed stalls -> MAF reading drops -> fuel is reduced and BAMMM

[Richy200]

As it's slower now than when I got it? And what's the point in having a bigger turbo if you can't use it? I'm running about 1 bar I would think.
This is why it needs mapping so it can be done effectively and not just someone winding boost up and up.