Vectra injectors fitted to a NA 4.6.
Discussion
I have just fitted a set of cleaned and matched Vectra injectors to my 4.6 chim.
Chimpofdarkness/tonic/frollic has these already fitted to his 4.0 but runs a MA chip iirc.
The vectra flow 250 cubic thingies as opposed to the Lucas 200.
I am running the standard Lucas jobby with an adjustable regulator that was increased to run the Vectra units.
I had every reason to believe that this may not be compatable with the Lucas system but thought I would give it a whirl before going MS.
First graph is running standard Lucas injectors.
2nd graph running Vectra injectors.
Torque starts sooner and is a much "fatter" curve as well as improved.
Power is slightly up, rises without a slight dip and moves peak power further up the rev range.
Chimpofdarkness/tonic/frollic has these already fitted to his 4.0 but runs a MA chip iirc.
The vectra flow 250 cubic thingies as opposed to the Lucas 200.
I am running the standard Lucas jobby with an adjustable regulator that was increased to run the Vectra units.
I had every reason to believe that this may not be compatable with the Lucas system but thought I would give it a whirl before going MS.
First graph is running standard Lucas injectors.
2nd graph running Vectra injectors.
Torque starts sooner and is a much "fatter" curve as well as improved.
Power is slightly up, rises without a slight dip and moves peak power further up the rev range.
Yes, I am sure MS or similar will give a little gain and no doubt a bit of economy as well.
As to driving, very smooth, absolutely no shunting or hesitation and pulls smoothly up to 7K!
Flooring the throttle in 5th at 90 gives instant pickup and sees 140 in what seems like a few seconds, (on my special test track).
As to driving, very smooth, absolutely no shunting or hesitation and pulls smoothly up to 7K!
Flooring the throttle in 5th at 90 gives instant pickup and sees 140 in what seems like a few seconds, (on my special test track).
Nice one Peter 
On the basis of your impressive results I will be fitting an adjustable fuel pressure regulator as part of my new Canems engine management installation
This will make fuel pressure another parameter to work with when we map the new system and should allow me to take full advantage of the Vecta injectors for the first time since I fitted them two years ago
Bye Bye distributor, 14CUX & Mr Mark Adams
It's time for me to embrace the future
On the basis of your impressive results I will be fitting an adjustable fuel pressure regulator as part of my new Canems engine management installation
This will make fuel pressure another parameter to work with when we map the new system and should allow me to take full advantage of the Vecta injectors for the first time since I fitted them two years ago
Bye Bye distributor, 14CUX & Mr Mark Adams
It's time for me to embrace the future
haircutmike said:
The vectra flow 250 cubic thingies as opposed to the Lucas 200.
Did your originals have a few miles/squirts under their belts or still working at their best would you say?In other words is your feeling that the improvement is entirely down to swapping for a different type or a bit of both?
Ribol said:
haircutmike said:
The vectra flow 250 cubic thingies as opposed to the Lucas 200.
Did your originals have a few miles/squirts under their belts or still working at their best would you say?In other words is your feeling that the improvement is entirely down to swapping for a different type or a bit of both?
I would say a bit of both probably 
but the Vectra/Bosch lookalikeies have a far superior spray pattern coupled with the fact he is pushing the duty cycle of the Hotwire/Sagem inj's out of their comfort zone at those outputs 
Simon says said:
I would say a bit of both probably but the Vectra/Bosch lookalikeies have a far superior spray pattern coupled with the fact he is pushing the duty cycle of the Hotwire/Sagem inj's out of their comfort zone at those outputs 
Ribol said:
Simon says said:
I would say a bit of both probably but the Vectra/Bosch lookalikeies have a far superior spray pattern coupled with the fact he is pushing the duty cycle of the Hotwire/Sagem inj's out of their comfort zone at those outputs 
especially seeing as the Hotwire inj's were not originally specced for the 4.6 never mind a tuned version, and the way i see it if the disc/hosing design was so good every manufacturer would have jumped on the band wagon it's nice knowing all these little improvements can still be found with the old RV8 and cheap too 
Edited by Simon says on Sunday 24th June 15:19
Peter, following Simon's comments you need to be taking the 350 challenge
That would be 76hp per litre......... from a normally aspirated RV8
It's possible 350 would put you at very the top of the 4.6 tree
Personally I'm taking the 268 challenge on my baby 4.0 litre
My last dyno run proven 238 on the 14CUX with dizzy & Stealth cam, & that was before I junked the very restrictive main cat & fitted an ACT Y piece.
Even as a conservative estimate that one change alone felt like an immediate 10hp gain on my bum dyno.
So here's my logic:
Lets start with my dyno proven 238 base, add 10 from the ACT Y peice plus a conservative 20 from my Canems.
= 268hp
Could that mean with decent pair of heads & some other inlet side improvements the mythical 75hp per litre 300hp 4.0 litre is no longer just a dream?
That would be 76hp per litre......... from a normally aspirated RV8
It's possible 350 would put you at very the top of the 4.6 tree
Personally I'm taking the 268 challenge on my baby 4.0 litre
My last dyno run proven 238 on the 14CUX with dizzy & Stealth cam, & that was before I junked the very restrictive main cat & fitted an ACT Y piece.
Even as a conservative estimate that one change alone felt like an immediate 10hp gain on my bum dyno.
So here's my logic:
Lets start with my dyno proven 238 base, add 10 from the ACT Y peice plus a conservative 20 from my Canems.
= 268hp
Could that mean with decent pair of heads & some other inlet side improvements the mythical 75hp per litre 300hp 4.0 litre is no longer just a dream?
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