Author Topic: Agu injector size (maths involved)  (Read 916 times)

Offline beppe2672

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Agu injector size (maths involved)
« on: 27 March 2013, 11:57 »
I know maths is dangerous stuff, but I've been doing some working out trying to figure out what injectors to go for as I'll be making a custom 3" maf housing for my agu. So far I know to keep a/r trim levels the same you need to increase the injector flow rate the same percentage at the increase in surface area of the maf housing. So if my maths has served me right:

Standard agu maf = 2.5" (63.5mm)
New maf housing = 3.0" (76mm)
The increase in surface area is 43.2%

Standard agu injectors @3bar = 205cc.  +43%
So the new injectors should be around the 290-300cc mark.

Is this right? How come people use the Saab red tops(360cc) with the vr6 maf (2.75")
1999 1.8t AGU, KNN Panel filter, Smoothed air box, Custom CAI, Forge 007 dv, REVO stage 1, 3" eBay TBE. Audi TT quickrack.

To come - A DIY hybrid K03 and a whole lot of supporting mods!

Offline Dalo Harkin

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Re: Agu injector size (maths involved)
« Reply #1 on: 27 March 2013, 12:36 »
293.15 is the figure, The VR6 MAFs I have seen are 3"
ARZ K03s, Oettinger Side Skirts, R32 front, Carbon stage 2, Forge 007p (yellow spring), Forge Actuator (yellow spring), Pipercross panel filter with DSG parts, N249 and N112 deleted, SAI deleted, Carbon canister deleted, Rear wiper deleted, Long Life turbo back custom exhaust with 200 cell sports cat, VR6/G60 clutch kit, Creation Motorsport TIP, Catch can, 'Wellycooler', K04 charge pipe, S3 ported inlet manifold - looks pretty standard on the outside though :)