38 or 42 pph injectors?

Dave_mustang_50 · 01-05-2003, 11:51 AM

I am wondering what size injectors i should get for my combo-except for a cam change and a 14lb procharger. Using the analyzer it says that 38 lbs is in the safe zone and that 42`s are over injected. I`m curious because ive seen several signatures with the same lbs of boost running 42`s. Is there a reason or should i stick with the 38 injectors.
Thanks for replies

91GTturbo · 01-05-2003, 03:48 PM

You tend to see more driveability problems with 42's than 38's. Unless you have a custom chip or run some kind of fuel management system, 42's tend to foul plugs and are hard to get the car restarted once the motor is at operating temperature and they load up at idle. Some guys run them with the stock electronics and have no problems at all, depends on the car. With trying to decide between those two sizes, I say go for the 42's for just the added bit of safety and if it gives you an excuse to get a chip, at least your combo is optimized.

I don't really trust the analyzer, it said my 30's were fine and my car just dies after 4000 rpms. I bought a set of 36's, I've seen them with no fmu make a little over 420 rwhp.

01-05-2003, 11:51 AM	#1
Dave_mustang_50 Registered Member Join Date: Aug 1999 Location: New Port Richey, Florida Posts: 483	38 or 42 pph injectors? I am wondering what size injectors i should get for my combo-except for a cam change and a 14lb procharger. Using the analyzer it says that 38 lbs is in the safe zone and that 42`s are over injected. I`m curious because ive seen several signatures with the same lbs of boost running 42`s. Is there a reason or should i stick with the 38 injectors. Thanks for replies __________________ 1969 Mach 1 351C with a c6(for now) Sold 92 Rag Top GT Procharged & intercooled DSS 331 LC Holley Systemax 2 Intake, Edelbrock RPM Heads,E 303 ,blow thru air meter, race bypass, 42 pph injectors,65mm tb,1.7 rr, Mac long tube headers w/off road H pipe, Force 2 catback, TKO,Pro 5.0, K&N, Alum DS,3 core radiator, subframe connectors,3.73`s, Nitto DR`s and a Heavy Foot.

01-05-2003, 03:48 PM	#2
91GTturbo Registered Member Join Date: May 2001 Location: Valdese, NC Posts: 361	You tend to see more driveability problems with 42's than 38's. Unless you have a custom chip or run some kind of fuel management system, 42's tend to foul plugs and are hard to get the car restarted once the motor is at operating temperature and they load up at idle. Some guys run them with the stock electronics and have no problems at all, depends on the car. With trying to decide between those two sizes, I say go for the 42's for just the added bit of safety and if it gives you an excuse to get a chip, at least your combo is optimized. I don't really trust the analyzer, it said my 30's were fine and my car just dies after 4000 rpms. I bought a set of 36's, I've seen them with no fmu make a little over 420 rwhp. __________________ 91 single turbo vert

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