Injectors
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Joined: Nov 2003
Posts: 266
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From: Mid Mo.
Car: 1989 GTA - Gunmetal grey
Engine: 5.7 ltr.
Transmission: 700R4
Axle/Gears: 3:27 9 Bolt Borg Warner
Injectors
So I'm looking for new injectors for my GTA and came across 22# Bosch 3 hole and 4 holes injectors. Is there really a difference between the two ? Performance, fuel economy ?
Joined: Dec 2004
Posts: 16,734
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Injectors
The Bosch 3s perform great. I think they are 4 hole contact southbay08 to get a set.
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Joined: Jan 2003
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Re: Injectors
Just be cognizant of the fact that you may need to re-tune the ECM after putting in Bosch-III's. Both the injector flow rate (the value in the ECM that optimizes performance may not be exactly the advertised value), as well as what's known as Injector Pulse Width vs Battery Voltage Correction (which, it's off significantly, can HUGELY impact performance in a negative way). Go over to the TPI section as there a couple of threads on the issue.
Joined: Aug 2008
Posts: 410
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From: Lansing, Mi
Car: One owner '88 IROC 50k
Engine: L98 with bolt ons.
Transmission: T56
Axle/Gears: 3:42 again
Re: Injectors
Also the small PW values need to be tweaked. I have RBob's P4 system and it's not hard to adjust it's more a matter of finding the values to use was the challenge
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