little'un

iTrader: (9)

I've fitted a PPP this morning and having tested it up the motorway, I'm getting a peak boost of 17.7 psi WOT in 4th.

Is this right??? It seems a bit excessive to me.

I fitted the Intercooler piping, the ECU (with STI pink sticker) and the brass airflow restrictor between the compressor and wastegate.

I didn't fit the Prodrive exhaust, as i already have a H&S full decat.

Can anyone running a classic with full decat and PPP tell me what max boost they are seeing?

Is it possible that the boost control solenoid could need cleaning, and if so, how do you do this??

Any help/advice would be much appreciated!

zenyck100@hotmail.com

what is the brass airflow restrictor???

reason i ask is that i fitted a PPP ECU today, i already have an afterburner vortex back box, a TSL downpipe coming this week all thats left to do is the intercooler piping.

do i need this airflow restrictor?? and what is it??

Zen

little'un

iTrader: (9)

AFAIK the restrictor is changed/enlarged when you fit the PPP - to improve the 'reaction time' of the wastegate actuator. I bought mine from a breakers, so I had the brass restrictor just in case i needed it!

It is located in the vacuum pipe between the compressor housing and the w/gate actuator, on the compressor side of the T-piece that runs up to the boost control solenoid.

john banks

17.7 is a little high in 4th, if you thrash it on a cold wet day in 5th it could go to over 18 and then it might not feel very smooth.

Standard restrictor is 1.2mm bore, this is unchanged with PPP no this model year. If you drill out the restrictor in 0.05mm increments (get a drill set from Maplin) then ideally it wouldn't peak over 17 PSI or thereabouts. It will spool up slightly slower in lower gears though.

The boost target the ECU aims for is 15.7 PSI.

Beware this sort of fiddling, it was the start of a slippery slope for me that got me interested and I still haven't stopped

little'un

iTrader: (9)

Thanks for that info John... So you think that drilling it out by 0.05mm will/might make a noticeable difference to peak boost?

BTW...Do you know what the boost target is for a standard AE802 ECU. The reason I ask is that I was getting a peak of 16.6 psi with just a decat and K&N filter.
Could the decat be the reason why the boost is reaching higher levels than it should be???

john banks

802 - 13.7 PSI. 0.05mm goes a long way, 0.1 may be too much. 0.05mm is an 8.5% increase in area in the restrictor. 0.1mm is 17% !

Your previous peak on the 802 was too high for smoothness and good boost control. That is why you still have the problem on the PPP.

Actuator can also be adjusted say +- half a turn after doing the restrictor if you can't get it exactly right, it is a bit more precise.

Other alternative is a restrictor valve - see previous big post on this, but I can't access search.

StickyMicky

search works fine john

little'un

iTrader: (9)

Thanks John...Just been out and bought the drill bits.
Hope fully all will be sorted by tomorrow!

little'un

iTrader: (9)

Last night, I enlarged the brass restrictor hole by 0.05mm to 1.25mm
Boost seems now to be more controlled - peaking @ 16.4psi briefly, then maintaining 16.1 in 4th gear. Knoclink is displaying 1st and 2nd greens in first, second and third gears. At WOT in fouth gear @ 4500/5000 rpm detonation is occuring...The KL is illuminating like a Christmas tree. The ECU is knock correcting by 1 degree at this point. This is all occuring well below the 5500rpm ceiling for knock control set by the ECU
Running on Optimax.
As far as i can see, the next logical step is to take out the PPP ecu and replace it with the AE802 - then rerun the car monitoring boost and knock activity closely. If it is still occuring then a visit to the dyno for checking with det cans and further investigation will be required - All other parameters to control detonation are unadjustable by the user except maybe Octane level ( although SUL / Optimax should be adequate according to Prodrive!)
I would have thought that a Prodrive ECU would be fairly safe to run - the only mods. that are outside the PPP spec. ar the Airfilter (K&N) and the full decat.
I realise that detonation can be caused by a number of different factors, but does anyone have any ideas as to why this might be happening?
I am scratching my head in a big way!
I don't really want to put the car back to standard, but on the other hand I definately don't want to 'grenade' the engine!

Any further advice would be much appreciated!!!!!

john banks

Boost is spot on now.

The det is likely to be MAF sensor or a problem with fuel delivery.

PPP ECU is very safe, I would blame that last as they tend to be reliable and the map is a good'un. If the standard ECU doesn't do it, then it could either be a dodgy ECU or more likely the higher output is exposing an issue on your car as it tends to do.

little'un

iTrader: (9)

Just out of interest...
The PPP ecu came from a '99 car
My car is an '00
Is there any difference?

Also, Is there anyone who can check out the ecu for me?

little'un

iTrader: (9)

Put the standard ECU back in last night - No det. now.
Must have been that at fault then!