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Posted: Fri May 19, 2006 8:21 pm
by dragon_green
Just had a looky in the Haynes manual, for petrol engines it has chapters on Single Point and Multi Point injections systems. Nothing on carbs though.
Posted: Fri May 19, 2006 8:23 pm
by Polo Paul
Asked a mechanic i know, he is 90% sure that mk4 polo's were all EFI however the single point injection system looked very much like a carb, basically just a high pressure fuel pump and some ECU software.
The multipoints you can definately tell, i think they made the change to multipoint around 1998/99.
One way of telling is when you fire up you car in the winter do you have to put gas on to get it running, or does the car automatically adjust its revs itself? If it does then its EFI as even with automatic carbs you have to down the pedal the fully open the choke before starting the car ( i remember that from my mk2 Polo)
Posted: Fri May 19, 2006 8:26 pm
by Polo Paul
The_phat_controlleruk wrote:How about changing the camshaft (fast road) and getting the ECU re-mapped. That'll help.
Changing cams and a remap is very expensive and the pound/BHP ratio is crap on a small capacity engine. I dont even think anywhere does a propper remap for a polo do they? Its all solder on chips.
Remap would probably get you around 8bhp
Posted: Fri May 19, 2006 10:19 pm
by polopaul
iv got a 1.4 8v mk 5, n iv decided not 2 bother with performance n wait till i can get something thats a bit quick 2 start with if u get me. iv got a custom induction kit n am in the process of spraying an engine cover 2 smarten it up a bit uder there but i think thats all im going to bother with engine wise!
Posted: Sat May 20, 2006 7:37 pm
by LeMeph
well ill be damned it is efi! Whats the difference in bhp between the multi and single point injection?? is there any???
Chris,
Posted: Sun May 21, 2006 12:55 am
by Polo Paul
Officially there is no difference, but i had a multipoint 1.4 ibiza and now have a single point 1.4 polo and i would swear that the ibiza was a little nippyer (sp). All VAGs seem to put out a little more than the book figs suggest. I had a standard 2.0litre GTI 8v and that put out 8bhp more than book.
Posted: Sun May 21, 2006 7:51 pm
by LeMeph
ah kool so my polo migth actually be like 68bhp!!!! come on you bastard lets have ye on the strip right now
lol.
Chris,
Posted: Sun May 21, 2006 7:52 pm
by LeMeph
oh and i know an engine mod if you can get one. G40 supercharger anyone?
Chris,