Scotsman

iTrader: (3)

I've had my 2005 PPP wagon for just over a year now but never felt it was a punchy as I thought it would be. I came from a 3.2 V6 TT and have had a 320bhp Scooby before, so wasn't sure if my perception was way out.

Anyway, got a OBD2 adaptor and fired up the Dash Command and Torque apps to see what they said on the boost front. Given that they probably aren't as good as a manual boost gauge, I thought they would still give me an indication.

Anyway, peak boost measure on Torque was 9.8 psi and 11.6 on Dash Command. With a PPP'd car (has the piping/backbox and Certificate), wouldn't I expect around 17-18 psi?

Many thanks
Richard.

boosted

Std boost is 13/14psi so you currently have sub std boost.
I'd expect as you say over a bar with PPP, probably 1.2 bar ish.
Just depends how accurately your measuring it?

ScottyPPP

Target boost on the PPP map is 18.72 psi or 1.29 bar.

Scotsman

iTrader: (3)

Thanks guys - is the only real way of accurately measuring boost levels via boost gauge or can the ECU throw out that info accurately?

ScottyPPP

Romraider logger is pretty good.

JDM_Stig

iTrader: (3)

an ecu reset might be in order

Scotsman

iTrader: (3)

Thanks for the recommendation Scotty.

Ah, thanks for the suggestion JDM_Stig - I'll have a google on how to reset a newage ECU.

ScottyPPP

You can do it with romraider

Scotsman

iTrader: (3)

Looks like it's £200+ for the OpenPort cable with adaptors - not sure I'd make any use of it outside of the reset and rare diagnostics - though I'd imagine resale of the cable would be simple enough.

Cheers
Richard

JDM_Stig

iTrader: (3)

Obd lead from eBay for a fiver does the job you want

Scotsman

iTrader: (3)

Something like this?

http://www.ebay.co.uk/itm/ELM327-USB...item487cc1d1fb

JDM_Stig

iTrader: (3)

the cheap ones will do the job of logging and resetting of the ECU.
http://www.ebay.co.uk/itm/VAG-GROUP-...item27dad7c735

Scotsman

iTrader: (3)

Excellent - thanks

boosted

Or a £10 boost gauge?
Thing is though what are you going to do about it?

bludgod

iTrader: (3)

before resetting the ECU if you have the ebay/openport lead hooked up with romraider you can check the stored corrections in the ECU - this might give you a clue to any faults or persistent knock that the ECU is picking up.

JDM_Stig

iTrader: (3)

Come on then, how is a £10 boost gauge going to reset an ecu or assist in logging ?

bludgod

iTrader: (3)

a £10 boost gauge should be a stage 0 mod along with an upgraded fuel pump - knowing if your vac is low or boost too low/too high can be great when hunting down a problem. The diagnostic lead should then help zone in on what's up.

Scotsman

iTrader: (3)

Thanks - great tip.

ScottyPPP

Romraider is a very useful too though. It'll log boost etc too, as well as read fault codes, show learned knock correction etc etc. For a £5 lead its well worth it.

Scotsman

iTrader: (3)

Well, got a cable and tried RomRaider (manifold relative pressure - corrected) and it's showing boost between 10 and 11 in general when pushing on and with a peak of 12.6 (min of -11.46). Not tried an ECU reset yet and will check out to see if the restrictor pill is in the right side.

No wonder it feels a bit less pokey than I was expecting!

bludgod

iTrader: (3)

in romraider logger press the LTV button on the left hand side then hit "save as image" and post the image up

Scotsman

iTrader: (3)

Thanks, will do when I get home tonight.

What sort of screen is best, the dashboard one? Also, any other parameters worth displaying/recording?

Many thanks
Richard

ScottyPPP

Glad you got it working, it's a useful tool

bludgod

iTrader: (3)

i never use the dashboard one, i normally just use romraider for logging to a file then reading the file later with excel so you can draw charts with it. LTV info gives you a decent overview of the car - normally combine with 2 logging runs to make sure all is well.

Loggable items usually include:
Engine Speed
Vehicle Speed
Throttle Angle
Manifold Relative Pressure (direct) PSI
Engine Load
Mass Airflow (g/s)
Manifold Relative Pressure
Boost Error (or Target Boost depending on the ECU type)
Primary Wastegate Duty Cycle
Ignition Total Timing
Feedback Knock Correction
Fine Learning Knock Correction
A/F Sensor #1 (afr) and ideally your wideband reading as well for comparison


Using the above I'd do 2 runs starting around 2500rpm for a WRX or 3500rpm for an STI then take a scroll over the data to see what's what.

Scotsman

iTrader: (3)

Fantastic help - thanks :-)

Will post it up once I've done the runs later.

Cheers
Richard

Scotsman

iTrader: (3)

Hmmm, looks like I'm being a noob. Clicked on LTV and it just says Querying ECU at the bottom of the screen and nothing else changes. I can't have it set-up right, or perhaps the cable isn't good enough? anyway, I'll see what I find on Google.

bludgod

iTrader: (3)

yeh that's all it normally does, only works when your connected to the car and ignition is on. I normally nab it at the end of a logging session.

Scotsman

iTrader: (3)

Does it just write the info to the log file? Nothing changes on-screen.

bludgod

iTrader: (3)

once it's queried all the data from the ECU it presents it on screen for you with an option to save as text or save as image.

Scotsman

iTrader: (3)

Ah - with me it just sits saying querying ECU at the bottom and doesn't present the info to the screen. I left it a good 5-10 mins. Does it happen quickly?

Thank for the help.