Can't remove boost cut
 

For some reason I'm unable to remove the boost (fuel) cut in an Evo7 GT-A! I inserted all 319s under boost limit but to no avail, the cut came at 19 psi of boost. I even tried inserting a big number under boost delay timer but still the it cut at 19 psi! Am I missing anything, or could it be an error in my xml definition?

Nads had this issue, it appears the definition for the GT-A rom ID is not correct for boost cut.

Thanks Gray,
I just sent you a pm on GM.

Whats your romid?

It's 80700010
I don't think there is any other id for the GT-A!

foxbat try my xml for that rom.

https://www.evolutionm.net/forums/at...u-80700010.zip

I'm going to see about confirming the location of the fuel cut region.

Found what i think is the fuel cut load table

There are two of them probably the 1-3 gears and 4-5 gears like the rest of the maps.

Map 1:
3A48

Map 2:
3A58

<table name="Fuel Cut 1" category="Fuel" address="3a48" type="2D" level="1" scaling="Load8">
<table name="RPM" address="5a70" type="Y Axis" elements="9" scaling="RPM"/>
</table>

<table name="Fuel Cut 2" category="Fuel" address="3a48" type="2D" level="1" scaling="Load8">
<table name="RPM" address="5a70" type="Y Axis" elements="9" scaling="RPM"/>
</table>

Hmm, I think that's what we need to remove boost, I can try it as early as of tomorrow, very impressive! {thumbup}
Could you investigate the following address: 173e (1d table) this should be the 'timing retard limit' which would be useful setting up some sort of anti lag.

Thanks

Hmm i can

I noticed something later when i posted one of the addresses of the fuel cut is wrong. The second one should be 3a58

Did you get the chance to check that timing retard address?
On the 80700010 thread, Tephra posted the same addresses for boost limit tables but with different rpm addresses than yours (6266) & they seem to be working fine.

Thanks again

Nope haven't had much time this weekend to myself :P

I'll probably check on it when i get back to work on monday. Consider just trying the values out in the meantime. I think the default retard limit for most evo's was -10 degrees or so.

I pulled the rpm axis out of following the map Y axis i'm sure one of them are correct tephra probably knows the rom better than i do trust his judgment on this.

I think the default retard limit is -5 it appears in most roms as the number 188. -10 is represented by the number 203

Keep me posted
take care

Thats not quite right from what i've seen the ignition timing value are a little strange, its a 16 bit number with quite a bit of resolution in it. The place which you mentioned appears to be right its somewhat strange the knock retard sub isn't in its own sub like the other roms took me a little while to notice.

Scaling:
<scaling name="IgnTimingECUa" units="deg" toexpr="61-x*90/256" frexpr="(61-x)*256/90" format="%.1f" min="-30" max="50" inc="1" storagetype="uint16" endian="big"/>

Table:
<table name="Timing Retard Limit" category="Limits" address="173e" type="1D" level="1" scaling="IgnTimingECUa"/>

Boost limit tables with the new addresses worked fine & I was able to remove boost cut! I set ignition retard at -17 for testing & inserted some -ve timing in low load areas but still didn't get any bangs :rolleyes: I'll try -20 ignition retard the next time. I've been getting a lot of phantom knock confirmed by detcans & non of the 80700010 XMLs I have contain knock control tables.
A friend provided the following addresses for knock control:
<table name="Knock Multiplier - Low RPM" category="Knock Control" address="177a" type="1D" level="1" scaling="uint16"/>

<table name="Knock Multiplier - Mid RPM" category="Knock Control" address="24a8" type="1D" level="1" scaling="uint16"/>

<table name="Knock Multiplier - High RPM" category="Knock Control" address="21dc" type="1D" level="1" scaling="uint16"/>

<table name="Knock Adder - Single Gain" category="Knock Control" address="177c" type="1D" level="1" scaling="uint16"/>

<table name="Knock Adder - Triple Gain" category="Knock Control" address="1780" type="1D" level="1" scaling="uint16"/>

Do these look right?

hey
 

i have a evo5 just bgt it 3months ago..im having promble with boost cut..m car is standard and it gives a boost cut on 15psi..what can i do??please help