Peugeot 1.9 8V GTi - setting up the modified engine

TR-Spider · Post by **TR-Spider** » June 14th, 2007, 7:38 am

Hi Damir

Good news! Nice to see you could get your engine running.
I am very interessted in the ecu modification you did, could you please publish a wiring diagram showing your resistor setup and where/how they are connected to the ecu?
Concearning the WOT enrichment: on my (Fiat 124) L-Jetronic there is a double-switch mounted on the throttle body, with one switch closing with throttle closed (=fuel cut off at closed trottle if rpm>1500), the other switch closing at throttle opening >70â€šÂ° (=WOT enrichment, factory setting +6% fuel). Maybe it would be possible to adjust there?

Thomas

Post by **Guy Croft** » June 14th, 2007, 11:33 am

Damir - hi

A cautionary note!

Be careful, you might be throwing 'too many balls in the air'. The 'golden rule' of tuning and fault finding is not to do too many steps at the same time, and preferably do_one_at_a_time. If you don't follow this precept you never know which step made the difference.

So far you have:

1. Before few weeks ago I have fit FSE power boost valve but ...

2. IÂ¢Å¾Â¢ve also fit a modified ECU (as you can see in the pictures) this helps a bit also it has two resistors soldered in the idle and off idle circuit ..

3. Also IÂ¢Å¾Â¢ve fit another AFM (Air Flow Meter) which was properly adjusted on rolling road and ...

4. I have found some bigger injectors in my garage...

I might be wrong - if so explain step by step which is solving waht problem. In my view there is too much overlap between the functions of these parts in the fuel cycle to be able to tell which ones are really needed.

GC

DamirGTI · Post by **DamirGTI** » June 14th, 2007, 2:26 pm

Hi !

No problem i will explain that Guy !

1. FSE boost valve - IÂ¢Å¾Â¢ve fit this first and i didn't feel any noticeable difference except just a little stronger acceleration at WOT .

2. AFM - this was second and i found this better then my previous AFM better cold start stable idle speed and better fuel consumption .

3. INJECTORS - then this , maybe this helps the most (but the modified ECU did also) IÂ¢Å¾Â¢ve been changing the rubber pipes on the injection rail and then I spotted numbers on the injectors so i write them on a piece of paper and go for a look for my spare injectors (i was remember having some spare injectors) and basically i wish to see if they are the same type and they wasn't ! So i take this 762 injectors to cleaning and fit to the engine , go for a ride and felt so much better , engine pulling stronger than before !

4. MODIFIED ECU - this was the last part IÂ¢Å¾Â¢ve fit and its a bit of the story like the injectors , everybody on our Peugeot forum was saying that this is one useless modification (well maybe on standard car) but i found this most useful for fine tuning after all this parts fitted before (FSE valve and injectors) i start from the factory settings of 1200Ohms to the 4000Ohms turning by steps of 500Ohms : 1500-2000-2500-3000-3500 and found the best at the 2000-2500Ohms not too rich and not too lean . I can feel that car goes better-worse as i change the resistance , on 1200Ohms the car goes good but donÂ¢Å¾Â¢t want to pull so strong as when i change this to 2000-2500Ohms , it seems even better on 3500-4000Ohms but it starts to drink fuel hardly on this settings so i back off to 2500Ohms .
And this is it me thinks .. if someone have a question about something else that i didn't mention please ask !

Damir

DamirGTI · Post by **DamirGTI** » June 14th, 2007, 3:04 pm

Hello Thomas !

The basics of this ECU is Superchips modification , you can read more here :
http://www.205gtidrivers.com/articles/e ... chips.html
By the way the transistor isn't quite drawn right on that diagram - the throttle switch will be connected to the transistor base... , but is otherwise correct.

I will be most interested to hear your comments , so report please when you try that on your car !

Damir

Post by **Guy Croft** » June 14th, 2007, 4:53 pm

Outstanding, Damir!

I though that hope the fuelling is being checked with Lambda or gas analyser.

GC

DamirGTI · Post by **DamirGTI** » June 14th, 2007, 5:55 pm

Hi !

Thanks ! yes IÂ¢Å¾Â¢m waiting for the wideband lambda sensor (i already have gauge for wideband sensor and one of my mates has order this sensor and will borrow me that for few days..) so i will be able to check that air-fuel ratio more correct than this , and will do that CO test at MOT also .
This measurements that IÂ¢Å¾Â¢ve posted here are from the narrow lambda sensor and a multimeter connected to the sensor so they may not be correct but the engine certainly isn't running lean at WOT . Also the spark plugs are looking good now , not shiny- white coloured any more .

Thanks
Damir

DamirGTI · Post by **DamirGTI** » June 16th, 2007, 4:53 pm

Hello !

I just wish to add a few pictures of my spark plugs now after the mixture adjusting .
Me thinks that this is good colour now , or at least close to the colour which the must be ..

Regards !
Damir