I have just fitted a dawes to my STI 7 to cure the spiking and boost creep, I fitted it and gradually cranked it up to 1.3bar held in all gear but when I blast it in the lower gears the knocklink is lighting up like mad.

Before I fitted it the boost levels where as follows;

1st - 0.8bar
2nd - 1bar
3rd - 1.2bar
4-6th - 1.35/1.4bar

does anybody know if the boost levels on the ppp are mapped low in the lower gears to prevent this detting or is there something else wrong?

Cheers

Scott

 

Just to add the Lambda link looks normal so I don't think its running lean, I had a dawes on my classic and never had any problems.

 

When I mapped STi 7 (non-PPP) setups I had to shave a lot of ignition timing off to run that sort of boost level.

 

Hi John,

before fitting the dawes I was still getting 1.35 - 1.4bar so I've not increased the max boost, all be it that I would only get that level of boost in the higher gears, its only now that I getting 1.3bar held in all the gears that its detting in 2nd and 3rd gear?

Scott

 

Scott

Firstly, you haven't got an STi 7 PPP!!

The first STi models with EU type approval were 02MY which would be STi 8 if you were to use a numbering system. The 05MY is therefore an STi 11 so why people still call them STi 8, I don't know (sorry, pet hate....)

The level of boost that a PPP runs is not the same at all engine speeds. What is acceptable at 4000 rpm is not what is OK at 6500 so a mechanical device like the Dawes that isn't sensitive to engine rpm is not the way to go. 1.3 bar at 6000+rpm will be causing huge det. If the ECU can stop the det you will get severely restricted performance, if it can't you'll be down to 1 man power....

Mike

 

Cheers Mike,

Is that only applicable to the STI 7/8 PPP or all cars, plenty of people run dawes or other form of boost control that don't allow for setting the boost level dependant on RPM? I ran a dawes in my classic for about a year with no problems.

So I take it the next option is do ditch the dawes and go for a 3 port boost solenoid to better manage the boost level?

Scott

 

Scott

As I said above, we don't do a PPP for STi 7, only 02MY STi onwards which would be an STi 8......

In any case a simple device like the Dawes cannot be relied upon to control the turbo when the ECU is expecting to have proper control over it.

What is wrong with the boost control system on the car at the moment and what spec is the car?

Mike

 

ECUTEK remap is the only way ahead for you Scott.

 

If I had an Sti I wouldnt put a dawes anywhere near it!!!

 

Its a 02MY STI PPP with OBX headers and AEM induction fitted inside the drivers wing I've also got a Hyperflow TMIC on its way to me.

As far as whats wrong with it, not much but since fitting the headers it does spike a bit, I drilled out the restrictor which has helped but the main thing was to try and hold the boost is it does tail of very quickly.

As far as the Tek3 concerned I am planning some form of ECU upgrade but I was wanting to get all my bits together first incl a bigger turbo, fitting the TMIC and possibly some ype of auto water spray, so the remap will come in time, hopefully.

Scott

 

Headers can reduce knock sensitivity on some models, induction kits can alter MAF tube diameter and airflow patterns leading to lean conditions and advanced ignition timing. I would seriously drive it off boost until you get it remapped.

 

I didn't get anything out of my knocklink until I fitted the dawes, as for the induction the tube dia is the same as the oem maf housing its just extended through the inner wing, the lambda link has always shown the mix as being rich on boost.

John do you know if the PPP Ecutek Ecu has the licence to allow it to be remapped or would I be better selling the PPP kit and getting a Tek3 done on my old ecu

Scott

 

Better selling it and Tek 3 the old ECU.