4 bar fpr and fuel pump

[Redliner]

From what I've been reading the 440's are getting on a bit and there's more advanced injectors out there that are better suited to multi-valve engines.


The 386cc injectors seem to have a good rep.

I ran some numbers and running the 386cc injectors on 4 bar will effectively make them run at 446cc (assuming they are rated 386cc at 3 bar) When the fuel pressure rises with the added boost pressure as you mentioned, they'll effectively be flowing 525cc at ~5.5bar.

Then using this formula:
Inj size (lb/hr) x 80% duty cycle / .60 Brake Specific Fuel Consumption
49.8lb/hr(525cc) x 80% / .60 = 66.4hp per injector x 4 = 265bhp

So running the TT injectors at 4 bar will support 265 crank horsepower at 22psi if I've done my maths right.
Which means I'll have to be pushing well over 180kw at the wheels before I need bigger injectors.

This thread may take out some of the guess work for you :
VWVortex.com - Fuel injection flow vs HP tables


More info here:
VWVortex.com - REFERENCE: Fuel Injectors for 1.8t

[s4mmie]

Good links, confirms my maths
It looks like I'll go with the 386cc, pain in the rear that ECS doesn't have the right ones... I think I'll leave them until I confirm the turbo to be sure.

Thanks for all the good info.

[h100vw]

Sam, the ones you need are in the ebay link, part number ends in BC. goggle it see what you find.

Other wise go with something a touch bigger and run them at 3 BAR.

Gavin

[Redliner]

Good links, confirms my maths
It looks like I'll go with the 386cc, pain in the rear that ECS doesn't have the right ones... I think I'll leave them until I confirm the turbo to be sure.

Thanks for all the good info.

I got the Bosch green giants. Good reviews :
Bosch 42lb (Green Giant)
42lb Green Giant Injector (each) - JH Motorsports Inc. - -- JHM. Shifting you to the next level of
You can buy them from IE at $50/unit:
Bosch 42LB / 440cc Green Giant Injector

Common injector for the power range that you're looking at.

[vwthunder]

Good links, confirms my maths
It looks like I'll go with the 386cc, pain in the rear that ECS doesn't have the right ones... I think I'll leave them until I confirm the turbo to be sure.

Thanks for all the good info.

I have the 386cc OEM TT/S3 ones, got them from Preeny.
They look like the ones on the ECS site, I will see if i can get a part number

[h100vw]

I have the 386cc OEM TT/S3 ones, got them from Preeny.
They look like the ones on the ECS site, I will see if i can get a part number

Really Troy, I had a set of them and they wouldn't fit in the manifold on my A3. They went in so far they practically touched the other side of the runner.

Gavin

[vwthunder]

Really Troy, I had a set of them and they wouldn't fit in the manifold on my A3. They went in so far they practically touched the other side of the runner.

Gavin

GIAC specify all OEM

386cc's
S3/TT225 MAF