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Author Topic: throttle is closing when pressure goes above 2.55 bar absolute. Rs3 8v.1 2015  (Read 3947 times)
Piar
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Hi Everyone!
So we fit big turbo to rs 8v.1 and i cannot rise the boost above 2.55 bar(absolute) because throttle is starting to close. as i know the problem is in maximal allowed boost which content in program code.
also i have found explanation how target throotle position is calculated in med 17
 plsol_w = pssol_w / vpsspls_w.
when vpsspls_w> 0,95
target throttle will be=(pssol_w - plgru_w) /(plxs_w-plgru_w)


plsol_w target boost pressure
pssol_w boost pressure before throttle
vpsspls_w  is the required pressure ratio from the boost pressure control
plgru_w ambient pressure
plxs_w  maximal target boost pressure

so the question is if anybody can help me to cope with this problem? ready to buy working solution. But please don't even try to offer map sensor rescaling
In attachment you can find current file where boost is 2.50 bar straight and throttle is opened 100%. car is making 510 whp on 98 ron+ wmi injection
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3ri
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Hi Everyone!
So we fit big turbo to rs 8v.1 and i cannot rise the boost above 2.55 bar(absolute) because throttle is starting to close. as i know the problem is in maximal allowed boost which content in program code.
also i have found explanation how target throotle position is calculated in med 17
 plsol_w = pssol_w / vpsspls_w.
when vpsspls_w> 0,95
target throttle will be=(pssol_w - plgru_w) /(plxs_w-plgru_w)


plsol_w target boost pressure
pssol_w boost pressure before throttle
vpsspls_w  is the required pressure ratio from the boost pressure control
plgru_w ambient pressure
plxs_w  maximal target boost pressure

so the question is if anybody can help me to cope with this problem? ready to buy working solution. But please don't even try to offer map sensor rescaling
In attachment you can find current file where boost is 2.50 bar straight and throttle is opened 100%. car is making 510 whp on 98 ron+ wmi injection

Exactly the same problem as I am having, anyone out there who has a fix?
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gt-innovation
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Any of you can log pvds_w ?

The reason i am asking is this.... At the end of LDRPLS plsol and pvds_w is formed.

PFLASH:802096A4 loc_802096A4:                           ; CODE XREF: LDRPLS_10ms+418↑j
PFLASH:802096A4                                         ; LDRPLS_10ms+41E↑j
PFLASH:802096A4                 lea             a15, [a0]-0x6A64 ; plbasflt_w "Gefiltertes plbas_w bei Getriebe- oder ASR-Füllungseingriff"
PFLASH:802096A8                 ld.hu           d0, [a15]0
PFLASH:802096AC                 lea             a15, [a0]-0x6A54 ; plxs_w "Maximaler Soll-Ladedruck"
PFLASH:802096B0                 ld.hu           d15, [a15]0
PFLASH:802096B4                 min.u           d0, d0, d15
PFLASH:802096B8                 lea             a15, [a0]-0x6A56 ; plufmn_w Minimaler Druck nach Luftfilter
PFLASH:802096BC                 ld.hu           d15, [a15]0
PFLASH:802096C0                 max.u           d15, d15, d0
PFLASH:802096C4                 mov16.a         a15, d13
PFLASH:802096C6                 sh32            d0, d15, #-8
PFLASH:802096CA                 st16.h          [a15]0, d15
PFLASH:802096CC                 sh16            d15, #-1
PFLASH:802096CE                 lea             a15, [a0]-0x5E2F ; plsol
PFLASH:802096D2                 st16.b          [a15]0, d0
PFLASH:802096D4                 lea             a15, [a0]-0x6A52 ; pvds_w Solldruck vor Drosselklappe (Wertebereich von 0...5120hPa)
PFLASH:802096D8                 st16.h          [a15]0, d15
PFLASH:802096DA                 ret16
PFLASH:802096DA ; End of function LDRPLS_10ms

plxs_w becomes 8 bit for plsol and as you see

it is shifted by -1 and saved to pvds_w.

LDRPLS_main on page 689 on the FR.
« Last Edit: September 14, 2019, 01:51:36 PM by gt-innovation » Logged
Piar
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 I have logged it
and maximal value i have seen is 2559,92
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gt-innovation
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I have logged it
and maximal value i have seen is 2559,92

Would be good to post part of the log you did here to ensure that we are on the right path.

sh16 d15, #-1 (bitwise shift right) is essentially converting the result from min.u d0, d0, d15  to a 0-5120  plausible value...

so there is a reason that i am asking the actual value of pvds_w...
« Last Edit: September 16, 2019, 12:15:07 PM by gt-innovation » Logged
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