Injectors?

[jamie86]

Hi there

I'm running 95 hp clean on the standart monopoint injector no problem.
But, full duty cykle is really close so to get more hp from the injector I will have to go for higher fuel pressure or a 2. injector.

Reaching 85 hp on the standart inlet fold is possible but over 90 hp you'll need a good head and inlet work and a better cam.
My cam is the 280 degree cam from Colombo & Bariani and my 95 hp is only possible because of the inlet manifold that I built for the engine.

Was hoping you would show up

I have a 280cam on it's way as well

Inlet manifold someone is looking into making one or I will have to approach a company to see what they say...

So are you planning on 2nd injector then?

 

[J333EVO]

i would say he needs to uprate the injector now if its running nearly 100% duty cycle, you really want to run at 80% to take into account spikes etc although this is more applicable to turbo cars.

i still think you can get a bigger flowing injector instead of the original as the ECU will work out how much to flow when its not needed at full flow like its does for the normal injector.

 

[Catseyes]

i would say he needs to uprate the injector now if its running nearly 100% duty cycle, you really want to run at 80% to take into account spikes etc although this is more applicable to turbo cars.

i still think you can get a bigger flowing injector instead of the original as the ECU will work out how much to flow when its not needed at full flow like its does for the normal injector.

Agreed, this is what the lamda sensor is for however a larger injector will not be as good as going mpi.

Why don't you use the 75 engine instead?

 

[jamie86]

Agreed, this is what the lamda sensor is for however a larger injector will not be as good as going mpi.

Why don't you use the 75 engine instead?

Already have a 1242 spi ready to fit...

 

[Catseyes]

Already have a 1242 spi ready to fit...

No offense but if you think you need to upgrade the fueling method then an mpi setup is superior and at £45 for a 75 head?

Maybe I'm getting old... :bang:

 

[Oldschool]

Already have a 1242 spi ready to fit...

You still could make an adapter plate and fit the 75 manifold.

 

[arc]

then control it with an MF2, or the MPI's ECU?

 

[Oldschool]

Should work with the SPI ECU, but I stand to be corrected.

 

[Catseyes]

then control it with an MF2, or the MPI's ECU?

You answered your own question, either...

 

[arc]

i think tom was looking into using an SPI ECU to control an MPI setup.

https://www.fiatforum.com/showthread.php?t=42195

I know an MPI ECU, or MF2 would do the job - was just pondering which would be preferable

 

[Catseyes]

i think tom was looking into using an SPI ECU to control an MPI setup.

https://www.fiatforum.com/showthread.php?t=42195

I know an MPI ECU, or MF2 would do the job - was just pondering which would be preferable

DTA lol

 

[arc]

well, yeah - my wallet would convince me otherwise (if i were looking into mpi conversions.. which im not like!)

 

[Catseyes]

well, yeah - my wallet would convince me otherwise (if i were looking into mpi conversions.. which im not like!)

£450 too much?

If you want reliable power you have to spend money!

 

[arc]

yeap, i know - but yeah £450 is beyond what i can budget to spend on my car. Already spent too much so far

this is why im not looking going to MPI. I'l be happy with a second injector and an MF2

 

[jamie86]

No offense but if you think you need to upgrade the fueling method then an mpi setup is superior and at £45 for a 75 head?

Maybe I'm getting old... :bang:

Kindda wanna just stick with a SPI set up...

Only other way i'd go is 2nd injector like with turbo set-up's ready for future High Boost conversion....

 

[arc]

the 75 head is a better head than the 60/55 though isnt it - free-er flowing?

 

[J333EVO]

THing is tho, once you factor in MF2 at least £180 from eBay or £227+VAT from Aquamist, then your 2nd injector which ok could be had 2nd hand for not many pounds, then getting a suitable plenium chamber thing "bob" to FFers made up with the injector holder it may not work out that much cheaper.

Only my thought tho cos I don't know how much an injector or bob thing would be.

OK this may be a good optiopn if in he future you want to go turbo but if not maybe not viable.

PS on the turbo set up you also need fuel cut defender and a Webber thing that plugs into the fuel cut defender and takes vacuum from the MAP as well, can't remember what its called

 

[jamie86]

How would an MPI cope with being turbo'd though?


As more likely than not it'll happen at some point so would maybe be better going down the same route as everyone else....

 

[Tricker...]

So are you planning on 2nd injector then?

If I can not get fuel enough by raising the fuel pressure in the monopoint then I would go for the MPI setup.
1. Because a 2nd injector would most surely cause the mixture to puddle.
2. Because the MPI setup is easier to control and you will get the best dispensing of fuel in the cylinders.
3. Because I'm working on a new inlet manifold for the MPI setup - should be a nice setup when it's done, especially on a turbo setup cause the manifold will allow a bigger TB

I don't know if the SPI ECU could do it for the 75 ECU, but I would def. get the 75 ECU - this way the ECU doesn't need a re-map right away. The ECU isn't the most expensive thing at the scrappy - just remember to get the red key when you buy a new ECU.
I'm not sure the SPI ECU maps would cope with opening four injectors at the same time insted of one. Wiring are the same, but Closed Loop maps are limmited in it's adjustment.

A turbo setup would do fine on a MPI - in fact it would be a better setup than SPI.

 

[mase]

bumpin this cause it was bought up in another thread.

so in conclusion... uprating the Spi injector wouldnt really work.
the best bet would be to switch to an MPI set up via the 75 head / ecu, or run a MF2 contolling a second injector?

but what about upgrading the fuel pump?