My knocklink has been flashing reds at me, sometimes on lift off, sometimes a quick flash towards the top of the rev range (it only happens when I am flooring it, it runs fine on 3/4 throttle). Sometimes it is fine and I think all is ok, then suddenly I get a red.

Thought it could have been the decat so put the cat back on, and seemed improved but still getting some warning lights.

Tried a new (second hand) MAP sensor, no change, tried my spare MAF sensor, no change, the lambda sesnor is quite new. My coils are quite new and so are my spark plugs which are 7's gapped to 0.7mm.

Running on Optimax with Millers.

Its a 1994 WRX import with Z4 ecu and TD05 turbo. So, I have in effect a standard car with all sensors running well, and I am still getting knock 'reported' on my knock link.

Boost level is standard and correct, not getting spikes at all.

It is really really pissing me off.

Could it be a faulty or old fuel pump, as this is the only thing I can think of. I do not have an AFR meter so cant be sure.

Should I just ignore it? Or not drive quite so hard?

Any advice greatly appreciated.

 

um. my bet would be that Z4 ecu.. have you tried NF or Wynns OB? I get terrible knock with millers.. but on the others its sweeeet

 

Get an AFR fitted ( Autometer are quite cool / good ) and check for air leaks after the MAF - loose / split hoses etc.

Your TD04 based car isn't used to a TD05 air volume ( even at same pressure - more CFM ) despite the ECU, so more cylinder pressure and hence det. Not sure how / if the z4 copes with this. Try an ECU reset and go for a burn.

I get det at 4.5k - 5k rpm on WOT with my TD05 modded Wagon ( had TD04 OEM ) and TD05 version scoobyecu... needs a little advance pulling there I guess. S'pose it's cos I am running 18 - 20 PSI boost though via the electronic boost controller

Try cooling the air charge ( make a cold air box / feed to air filter, keep engine air out, get a larger TMIC, get water spray, etc. ) which may help.

You could invest in a diagnostic rolling road session to identify the problems? Any near you??

Let us know how you get on?

(PS - good idea would be to get a Power FC new ECU or similar and custom map the car! )

 

Rupert

Vulnax is the guy I was telling you about with his wagon

Just finished fitting the centre section, so Ill see how it sounds compared to the old one in the morning

Cheers

Steve

 

Evenin' All ...

Didn't know Roojai was from round here, although as you get about *Sonic*, we never know...

 

ooer

have you been pimping yer rally slag sonic?

 

Yeah Chrome, *Sonic* has been putting it about a bit, gotta get the cash to pay for his remap, once he gets that new turbo on....

 

Hope it sounds good steve, and those two extra horses make a difference.

I might go for a remap then. Power engineering is only about 1 hr 15 away. How much do they normally cost?

I better put the decat down back on if I do, eh? and headers, and up-pipe, and uprated fuel pump, and injectors......

 

Brad, I was pimping in the Golf LOL

Will take the scoob out tomorrow on the run to work, to see how it sounds

BTW Rupert, it hasnt been used enough, not coked up anywhere near enough , at least compared to my old centre

Neil, Roojai isnt from round here, but as you can see from the post, a wagon, with TD05 , and I mentioned the fact that you had only recently done a similar thing

My turbo WILL go on eventually, but more than likely after xmas now

 

Cheers for the help vulnax999, will check all connections etc, and try a reset but I have done a few resets recently (disconnected battery) so doubt this will help. Will try a PROPER reset this time.


What is the difference between my car and a saloon apart from the turbo and the ECU??? (and the body shape)

 

I think the wagons (with TD04) may have a different compression ratio.
It may be slightly higher hence why you get DET with a Saloon biased ECU.

 

AFAIK, mechanically (engine) and electrically (ecu) the saloon and wagon are identical.

 

Wagons have 9:1 compression ratio and TD04 turbo's ( in general ) where the saloon were 8.5:1 compression ratio and TD05 ( except UK cars as usual! ).

Not sure on gear ratios .. wagon may be a little lower ... top speed is down on saloon by the book.

Scott sorted my ScoobyECU a year or so ago, problems with std TD05 type map when converted to TD04 .. but when it was sussed it went well! Only changed chips on it when put TD05 on.

 

Thanks for that, I had no idea the compression ratio was different. I will have to try and get it mapped then.


What would the mapper do with a higher compression ratio engine? Lower the boost, increase the fuelling, or simply change the timing???

 

depends on the mapper, but timing retard is a good starting point