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Injector & Fuel Pressure Talk - Turbo Application 

 

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Posted: Sun Mar 13, 2005 9:35 pm 
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SVO XR6 wrote:
i want thoes injectors!!!
where from?


The 24lbs injectors are 2.6L Magna 4 cylinder injectors. Six should cost you about $200 2nd hand at the most (really ~$160) for ones in perfect condition. They are Bosch 775 blue tops.

A rough guide is 30lbs will support 300rwhp, 36lbs will support 360rwhp, and so on at reasonable fuel pressures (40-55psi) and good safe A/F ratios.
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Posted: Sun Mar 13, 2005 9:48 pm 
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pyroay wrote:
i'll let you know how i go with it.

Does anyone know where i can get liquid extruding done, you knwo where they pump a viscous and gritty fluid through the runners to bore them out and smooth off any dags??? somewhere in dandenong or Melb?


I have only ever seen an actual "Extrude Hone" here on the Gold Coast but the company uses it only on plastic molding. Andrew Sanders from Specialised Power Porting is supposed to be very good.
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Posted: Sun Mar 13, 2005 11:58 pm 
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Bert wrote:
SVO XR6 wrote:
i want thoes injectors!!!
where from?


The 24lbs injectors are 2.6L Magna 4 cylinder injectors. Six should cost you about $200 2nd hand at the most (really ~$160) for ones in perfect condition. They are Bosch 775 blue tops.

A rough guide is 30lbs will support 300rwhp, 36lbs will support 360rwhp, and so on at reasonable fuel pressures (40-55psi) and good safe A/F ratios.

and thoes magna ones will be fine of a XR fuel reg, chasing 250 rwhp?
coz im running 19's atm with 230 rwhp

 

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Posted: Mon Mar 14, 2005 12:03 pm 
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Bert wrote:
The 24lbs injectors are 2.6L Magna 4 cylinder injectors. Six should cost you about $200 2nd hand at the most (really ~$160) for ones in perfect condition. They are Bosch 775 blue tops.


Mine are green.

SVO - I got mine through my mechanic...if you're interested in a set, lemme know - I'll ask him.

Cheers,
Steve

 

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Posted: Mon Mar 14, 2005 12:10 pm 
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There are two types of Magna injector. The ones they ran factory fitted and then there is another injector which flows exactly the same amount and are commonly used as a cheaper alternative in Magna exchange injectors.

EIS in Queensland informed me of this when I was looking for a set of bigger injectors.

Give EIS a try, if in Queensland, they sell them fairly cheaply brand new.

I don't know the part numbers or colours of the top of my head unfortunately.
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Posted: Mon Mar 14, 2005 1:50 pm 
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dcstraight wrote:
Bert wrote:
The 24lbs injectors are 2.6L Magna 4 cylinder injectors. Six should cost you about $200 2nd hand at the most (really ~$160) for ones in perfect condition. They are Bosch 775 blue tops.


Mine are green.

SVO - I got mine through my mechanic...if you're interested in a set, lemme know - I'll ask him.

Cheers,
Steve


yeah, if you can ;)
cheers

MarkZE, can you give me a number? fanks :D

 

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Posted: Tue Mar 15, 2005 1:05 am 
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You will need atleast 30 Lb injectors before you even start to make some serious power...
Keep in mind what fuel pressure injectors are run at to compare flow rates....Mitsi I think run at higher f/p.....

 

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Posted: Tue Mar 15, 2005 8:22 am 
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I beleive Jim mock motorsport can get manifolds extrude honed... their EB has a BBM on it that i beleive has been ported using this method.. perhaps contact them, from memory it costs roughly $600..

also a mate of mine is using the magna blue tops in his EA, he's using a aftermarket fuel reg (unsure on specs) and a unichip as he'd maxed out the stock ones (~170rwkw)

 

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Posted: Tue Mar 15, 2005 4:12 pm 
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EBXR8380 wrote:
You will need atleast 30 Lb injectors before you even start to make some serious power...
Keep in mind what fuel pressure injectors are run at to compare flow rates....Mitsi I think run at higher f/p.....


Yep, I cant see the point in faffin around with little magna injectors...

SVO XR6, are you running lean now?
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Posted: Tue Mar 15, 2005 4:16 pm 
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CHEF wrote:
EBXR8380 wrote:
You will need atleast 30 Lb injectors before you even start to make some serious power...
Keep in mind what fuel pressure injectors are run at to compare flow rates....Mitsi I think run at higher f/p.....


Yep, I cant see the point in faffin around with little magna injectors...

SVO XR6, are you running lean now?
not running lean, but it hits 100% duty

i get my car back soon with a extra Throttle body and im guessing its goin to be leaner, so i need a cheep way to keep fuel there till i go turbo(in about a yr)

 

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Posted: Tue Mar 15, 2005 4:21 pm 
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Ah better slip some in then, do they run off the EEC ok? Ive heard they do, but idle could be suss
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Posted: Tue Mar 15, 2005 4:28 pm 
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Yeah I would have to agree about bigger is better on injectors for a turbo engine. Don't bother with anything smaller than about 50 lbs injectors. Around about the 550 cc/min minimum otherwise you will end up upgrading them again once you get a feel for the engine and wind the boost up.

I am on my third set of injectors now.

I had 340 cc/min injectors, maxxed them out, got hold of some 440cc/min injectors and maxxed them out so decided I wasn't messing around the third time and got some 750 cc/min Rochestors and stuck them in there.

Don't worry about idle too much unless you are trying to use a standard ECU. My car idles okay and it has a huge cam as well.

Also running high fuel pressures with little injectors is a good way to make a 600 hp fuel pump into a 400hp one.

Fuel flow capability of the pump changes with the inverse square of pressure it is required to supply. If you increase the working pressure you reduce the flow capability of the pump. This is particularly important when using rising rate regulators.

Always trial adjust your regulator up to the maximum pressure it will see in operation (allowing for rate rise if applicable) then flow your pump while the engine is stopped. Measure the amount of time it takes to get a litre or two of fuel returning to the tank or swirl pot and this needs to be able to keep up with your injectors.

Moral of the story is a 600 hp pump is not necessarily a 600 hp pump when it is pumping fuel at 70 or 80 psi into a rising rate regulator. Try to keep base pressures down around the 35 - 43 psi mark maximum especially if using a rising rate reg or you risk fuel line failures and fuel fires etc.
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Posted: Tue Mar 15, 2005 4:31 pm 
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CHEF wrote:
Ah better slip some in then, do they run off the EEC ok? Ive heard they do, but idle could be suss


EMS 8860 will run them fine :p

so you think they will do the job?

 

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Posted: Tue Mar 15, 2005 4:40 pm 
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ah yeah sorry man forgot you use EMS... pfft ecc :wink:

depends on how much more air is going in, i belive they ahve been used on low boost set ups so you might find them ok... You'd get a set for next to nothing from a big pick n pay style wrecker anyway.
And isnt changing injectors fun :?
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Posted: Tue Mar 15, 2005 4:42 pm 
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just make sure you buy new Orings... I spent a few hours fiddling with leaky orings... I got a petrol stain on the wall...
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