Increased Cylinder Head Flow The Std Injection System

[benlilly 0]

Hia,

 

Read and interesting topic and asked a few questions on the Guy Croft forum here:

http://www.guy-croft.com/viewtopic.php?t=268

 

It basically covers modding cars with relatively simple ecu's (e.g. 205GTi) and the ability of the ecu to cope with these modds.

 

I'm currently building a new engine for my 8v with a Pumaracing big valve head (bought from PhyR with the Turbo 205). To begin with, I intend to run it on the std injection and ecu. I'd like to add a fully mappable ecu at a later stage but don't have the spare funds at the mo.

 

Does anyone else have any experience of how the system copes with the increase in flow from a good head and the performance gains? I'm sure I'll gain some beans but do you think the injection/ecu will be the limiting factor?

 

Cheers,

Ben

[Craigb 2]

What cam is in the head ?

[benlilly 0]

Std Cam.

Ben

[veloce200 3]

Std Cam.

Ben

 

IMO should be fine then.

[benlilly 0]

Hia,

Not trying to catch anyone out but I have found the answer to my question in Probst's book on Bosch fuel injection which arrived this morning (really good read).

 

He says that the air flap system on Bosch LE/LU only effects fuelling up to 4000/4500 rpm. After this, it is fully open and the fuelling is based on the factory values on the ECU.

 

So the air flap will cope with increased flow (from head mods etc) up to these engine speeds but after that the mixture is likely to go lean.

 

His remedy is to up the fuel pressure to sort out the high rpm mixture and then increase the spring tension on the flap to bring the lower rpm fueling back down.

 

Has anyone tried adjusting the flap meter or know of any experienced companies who can do the work?

 

Cheers,

 

Ben