86TpiTransAm

I'm getting ready to start in on building my 383 Stroker and I'm trying to decide on what size injectors to go with so I figured I'd ask for some advice!! The engine is basically going to be as follows......383 Stroker with TPI, Headers, Ported 64cc aftermarket heads with 200cc runners, port matched intake, street/strip comp cam, TPIS air foil, Adjustable Fuel Pressure Regulator and then of course whatever size injectors I plan to use!! I know the stock 350 TPI injectors are 22 lb/hr so I was thinking about getting the Accel 22 lb/hr injectors that Jegs sells but I started noticing that I can get the 30 lb/hr injectors of the same brand cheaper through jegs (and of course even cheaper through the current Accel injector GP)!! My question I guess is, will the engine be able to handle the 30 lb/hr injectors with the mods I have listed or should I just go with some 22 - 24 lb/hr injectors and increase the Fuel Pressure??

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1986 Trans AM
305 TPI
4 Wheel Discs
9 bolt Borg Warner Rear
Completely Stock
Soon to upgrade to a 383 stroker w/TPI, Hedman Shorty Headers, 64cc Pocket Ported Worlds Product Sportsman-II heads, ported intake, comp cam, TPI air foil, Adjustable Fuel Pressure Regulator, possibly bigger injectors!
Current project: Keeping my car running until I get the money for the above mentioned project! :-)

[This message has been edited by 86TpiTransAm (edited January 25, 2001).]

Kevin91Z

iTrader: (1)

I think the SVO 24lb injectors would be fine for your planned setup.

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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=-

Ski89Z28

You may want to post this on the prom board cause you will need a custom prom made for it. But the thing you need to know about is the pulsewith and if you use 30lb injectors will the pulse with still be in that 85% range. For the TPI to work properly this pulsewith for the injectors should be ,I think, between 80 - 90% so with this will that be too much fuel for the engine?
I can't answer it but those guys can.
Good Luck!

doc

I agree that 24#/hr SVO injectors would be an excellent choice.

As mentioned above, you will need a custom chip.

In addition, in order to fine tune for best WOT acceleration, you will need a way to measure the fuel pressure as well as the O2 sensor output with a scanner. During WOT, the ECM goes into enrichment mode (similar to open loop mode). The ECM does not take into account the O2 sensor reading. You can adjust the fuel pressure up or down to achieve approximately 850 to 880mV from the O2 sensor which should result in optimal performance.




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'87 L98 TPI IROCZ, AFR190 heads, 3.70 gears, ZZ9 cam, 2400 Art Carr TC, SLP 1 3/4" headers, SLP cat-back, no cat, no AC, no MAF screens, Accel manifold base & SuperRam, Edelbrock double roller timing chain, MSD ext coil & distributor, trans cooler, 52mm TB with airfoil, TB coolant bypass, AFPR(58psi), K&N filters, Hotchkis lowering springs, Car-Pro custom chip, Lay Ind. ram air kit, 265/45R16 Kumho V700 tires.
ET 13.39sec @ 107.21mph
'90 Eagle Talon AWD, no rust thru 9 winters
'99 Camaro SS, red, 6-spd, T-tops, Mcleod clutch, Pro 5.0 shifter, MAF processor, Direct Flow airlid, K&N filter.
313.7Hp & 320.6ft-lbf, ET 13.55sec @ 105.1mph
next mod: 4.10 rear gears