With the ZZ4 cam in a 350, what injector size should I optimally use? Currently just have the stock 22#ers. Will have polished heads.
Also, what kind of gas mileage are you guys with the ZZ4 getting?
Thanks

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Rob
High Performance & Party page
Pics of my rides past & present and recent party pics!

89 TTA #426 20th Anniversary turbo 3.8 bone stock
94 Silverado Tuned Port Injected
87 Grand National- lil' ole V6, 12.40 @ 108 w/1.79 60'
95 Trans Am Conv.- LT1

 

22# injectors should be fine, just crank up the fuel pressure a bit. I got over 20 MPG with mine.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

I am running the ZZ3 cam with 19 lb injectors, but at a higher pressure thus simulating 22 lb injectors. So stock 22's would be fine. Do you have any other mods (heads, intake, etc.)?

This is on a MAF setup.

My mileage is GREAT! 18-20's around town. Rather surprizing actually.

Mark.

 

Mods will include Sportsman 200 heads, fully polished in/ex and chambers but not ported. Gasket matched intake to heads. Stock ported TPI/plenum. Headers and cat back.
And ZZ4 short block with ZZ4 cam.

 

I'm running the stock 22lb injectors.
I'll give a less optimistic mileage report. I'm getting 13/14 MPG with a combination of city and short commuting trips.
Haven't made a long trip yet, but I would estimate maybe 18 MPG tops.

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87 GTA, 350 TPI, auto, 3:27 gears, rebuilt engine, ZZ3 cam and valve springs, pocket ported stock heads, edelbrock intake, TPIS air foil, AFPR, high flow air cleaner, modified stock air canister, relocated air intake sensor, tb bypass ported plenum, modified MAF (screens removed), edelbrock headers, hi-flo cat, flowmaster muffler, stock chip.

 

ZZ4TPI, headers, MSD6al, good exhaust, ported Edelbrock intake, plenum, SLP runners. I pulled 20mpg on a 1500 mile trip, average speed was probably 75 or 80mph. We had the hammer down most of the trip. 95 South from Jacksonville to Keywest, then Keywest to Tampa, Tampa to Jax.
I'm running #24 injectors from an LT1.
22's are fine though. Pump up the pressure a tad.

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Rob P
89RSconvtZZ4TPI
Edelbrock Hi-Flow Intake
SLP Dual Cold Air Intake
1 5/8" Headers
Semi-Siamesed Runners
MSD6AL/relocated MAT/ AdjFPR/IROC frnt@rear swaybar/wonderbar/steeringbox/alum drvshaft/ Alston SFC/3:23posi disc rear/MAC LCA/H.Adams Panhard Rod/KYB struts/ shocks/
92Z28convt5spd
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

 

im running 19# SVO injectors at around 53# and it does fine

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86 z28 zz4 ssm lift bars ,3.73 simesed runners and a traction deficient 13.707@101.02 on 295/50/15 junk street rubber ,ASE master tec L1 certfied

 

Thanks for the info everybody
I'm getting about 14/15 mpg now, but there's a massive amount of timing removed trying to compensate for the TBI cam thats still in there, and to ensure no knock since I've disconnected the knock sensor due to the rod knock causing false detection of 20+ degrees...This is in my truck BTW.

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Rob
High Performance & Party page
Pics of my rides past & present and recent party pics!

89 TTA #426 20th Anniversary turbo 3.8 bone stock
79 TA 6.6l - all original stock
94 Silverado Tuned Port Injected
87 Grand National- lil' ole V6, 12.40 @ 108 w/1.79 60'
95 Trans Am Conv.- LT1