I'm running with my Evo X '08 on a boost from 22PSI at max torque and it tapers to 18.9 @ 6500.
I think it has a lack of power above 6500 so I've made several logs with VCDS and noticed the next thing:
When I do a pull in any gear at full throttle, the throttle goes from 96% to 60% above 6500RPM:


It's no setting in the throttle maps and there are no limiter faults in the DTC's, is this a known problem?

 

There is a thread about a car that was tuned at GST that is experiencing this. Tephra sent some tables to GST that were helping and I posted that something similar may have happened to me.

Sorry, I'm having trouble finding it right now.

 

That was a different issue.

This looks like the limit tables are being hit. What kind of mods are on this car and about what power level?

- Bryan

 

It's a stock eninge with a sport K&N Air filter
The car has in this softconfiguration 354HP and 458Nm. ( =338lb/ft)
(Yes, it runs on European premium gas)
The limiter maps are all edited:
(airflow 1-3 & torque limiter 1-3)
(airflow #4 & torque limiter #4)

The 4# map of the of the airflow and torque limiter are adjusted with research on the Dyno. first had some trouble at 4000-4500RPM, the engine blocked. after adjusting the 4# maps in the limiters we didn't had this problem anymore.

 

you should just disable the airflow checks...

 

I found a topic about it on this forum but it was only for 52680015 -> 52680020
but I need the mod for a 53040007 ...

 

https://www.evolutionm.net/forums/7420992-post1.html

 

I just read all 26 pages of the DTC disable thread.

Like the OP, I am hitting the brick wall, but am NOT throwing any codes.

From the DTC thread, the best I can gather is that we are adjusting the variables for the formula that, among other things, generates the code.

What I am wondering is, if I am not currently throwing the code, is altering this formula (I don't like the term disabling the DTC as its misleading) going to do anything for me? I'm making the (possibly wrong) assumption that the threshold for the code is the same as the power cut, and that both are determined by this formula, however my lack of CEL has me confused and wondering if I should be looking elsewhere (Boost Limit/Boost Cut Delay timer) for my fix.

 

There are also some throttle tables that are referenced as well.

I'm curious, have you bypassed the CEL checks as well?

- bryan

 

There is no "formula" changed by disabling the check... you are simply disabling the check (and thereby disabling the DTC). The other thread was probably titled that as the most relevant draw, but notes that you are disabling the check. You can alter the tables to set higher thresholds, but since they don't offer you any value and you are far above them at 28psi and significantly more airflow and torque than stock there is no reason to keep your ECU wasting cycles running the checks.

The cut above is probably more gradual and noticable (since the throttle is still partially open, fuel being delivered, etc). I can nearly guarantee that just like your VIII you are hitting boost cut and losing all fuel. Set the tables like I told you!

 

So I should disable 1235/1233/1234?

 

Seems like thats the answer. Either way it couldn't hurt to try.

 

i don't have the slightest clue what you guys are talking about but I sure do want to lol... and can't wait to know if the above fixes your issue! good luck

 

disabling the DTCs seems to only prevent limp mode in its various forms.

for me, upping the boost limits helped with fuel cut. I went back and looked at my logs and I was not seeing the drastic TP closure you are (my TP went from 98 to 96).

what's your ROMID? Can you post your ROM?

 

I'm running the same ROMID region as the OP.

I have NOT touched the tq limits or airflow limit tables... just disabled the DTC's..

Boost limit will of course need to be raised, but thats a no brainer, and wouldn't cause his symptoms..