under boost issues...here we go again!

[blade4real2004]

ok i have done a log i can open it with excel what do i do next hehehe

[blade4real2004]

heres what excel is showing me



from what i can work out my max bhp was 207bhp is that right?

[RTechUK]

Looks like the ecu is seeing the load like its should inn the midrange, lots of head room for more power and power just by looking at the 75 duty.  But if ther car feels slower you could have an over reading maf, or the void filling for the FMIC has just got rid of the inital spool and kick of power as the ecu see the actual load meet the requested load much sooner in the rpm range which will make the ecu cut the N75% too earyl.  The idea is to keep the N75% at 99% until the peak boost point at around 3000rpm but your seeing full load at 2320rpm @ 88% duty?

How old is you MAF and is in from TPS or main dealer?   If the MAF is a good one then the way around this its to have a custom map setup to take into all your added mods since the generic mapping.

[blade4real2004]

Ok I think I under stand what your saying so looks like the mapping needs ajusting for the extra mods? The maf is a genuine one I think it's been on there since new. Is it worth trying to clean it or trying my mates maf on mine? U mapped Paul's black golf not long ago and he made good power do I guess his maf is good

[RTechUK]

Ok I think I under stand what your saying so looks like the mapping needs ajusting for the extra mods? The maf is a genuine one I think it's been on there since new. Is it worth trying to clean it or trying my mates maf on mine? U mapped Paul's black golf not long ago and he made good power do I guess his maf is good

For elimination I would just get a new unit from TPS and then you know its right, 

[blade4real2004]

Alright cheers nick does the n75 look like it working ok from the data log?

[blade4real2004]

tried pauls maf and n75 on my car and tried my maf and n75 on his car and my car drove the same and his car drove the same if that help at all? do think it could be down to the mapped then?

[blade4real2004]

is there anything else that could be at fault? i was thinking about trying my old cooler back on it to see if i hit 20psi again just the hassle of taking it off and trying it to put it back on again, because it was night an day when i changed over to the THS cooler the power dropped and so did the psi, up to then was boosting as it should of.

[Chris.]

Dont take your boost gauge as a gospel reading of what your engine is doing.  Far far too many dont give a accurate reading.

Id check your joins on the THS cooler, especailly around the MAP sensor plug/blank.  Get some fairy liquid, make a soapy water mix in a spray bottle and spray onto the joins wile a mate holds the engine revs at around 2500rpm.

[RTechUK]

The logs say it all.   There is no major boost leak.

What fuel are you using? Its good to have some correction factor on V-power as it means your getting enough timing,  cheap 97 fuel can cause too much correction and a loss power and the car wont feel as nippy as the boost will be doing all the work on its work.

The ecu is seeing what is wants to see from the MAF, which with some fancy maths works out to be the actual load reading in blocks 25.

The ecu is seeing the resquested load value from the MAF gs reading, when it sees the hysteresis load values the n75%dc will reduce to keep the power linear.  If there was a boost leak the N75 would be much higher as it would be trying to get the actual load to match the requested.

Just needs a custom stage2 remap like we said from day one...   We dont offer generic stage2 maps anymore, but you twisted my arm..lol