replacing c-4 or TPI fuel injectors

[grumpyvette]

read thru the links provided carefully several times before you start and remember to oil the o-rings so they slide into the fuel rail and manifold easily without tearing,
all the o-rings on the fuel rails and injectors need to be dipped in thin oil so they insert and slide into place with less friction, this tends to greatly reduce the chance of the o-rings ripping, and yes you need the correct o-rings that fit correctly to begin with if you expect the rings to seal correctly
actually reading the linked info will get you both part numbers for the o-rings, and install instructions

WHEN TESTING<be sure the fuel pressure gauge reads correctly by comparing it to a second test gauge, these fuel pressure gauges are frequently defective

http://www.corvettefever.com/howto/corp ... ewall.html

http://www.corvettefever.com/howto/corp ... embly.html

http://fuelinjectorconnection.com/shop/ ... ductid=202

http://www.thirdgen.org/injectorswap

http://ljs.academicdirect.org/A14/031_049.htm

http://www.egauges.com/pdf/AutoMeter/837j.pdf

http://fuelinjectorconnection.com/shop/ ... at&catId=2

http://www.rbracing-rsr.com/rsrgauge.htm

http://www.airfuelmeter.com/english/lsu4_en_sensor.htm

be sure you use the calculators provided (in the thread link) to get the correct size injectors


viewtopic.php?f=55&t=1200

viewtopic.php?f=55&t=493

viewtopic.php?f=70&t=7309&p=24862#p24862

http://www.scirocco.org/tech/misc/afgauge/af.html

http://www.jegs.com/i/Accel/110/150824/10002/-1

if you are going to try for more than about 450hp read this

viewtopic.php?f=55&t=211

viewtopic.php?f=55&t=1030

viewtopic.php?f=55&t=231

YOU REALLY NEED THIS INFO
http://chevythunder.com/

If youve got an early year TPI , thats designed to use a 9th cold start injector,check the cold start injector as its a potential problem source if its not working correctly.BTW To remove the connector from the injector, push carefully in the middle of the locking clip, with your thumb, This will make the sides, and tips move OUT WARD in their connector slots allowing the tips that hold the injector into the connector to slide out of the way from the injector body, and you can then pull the sides away. WATCH the locking clip - IT can and WILL come off and get lost, if your not careful


IVE generally found no problem with any corvette LT1 or TPI efi if it will quickly build a minimum of 38-40PSI on start up and MAINTAIN at LEAST 38-40 psi for a MINIMUM of 10 minutes after the engines turned off, 40-42 lbs is what the factory tests want and expect so if your getting 38-40psi your pressure readings indicate a normal, perhaps even better than average pressure reading, and more than expected pressure retention,

BTW on carburetor equipped engines 5.0psi--5.5 psi of fuel pressure at the carb inlet port is about ideal

http://www.amazon.com/dp/B003BH5PUO/ref ... nkCode=asn

an extra long set of torx bits can be quite useful at times, working on a TPI intake
don,t forget the bolts that are UNDER the plenum

http://www.thirdgen.org/injectorswap

http://www.youtube.com/watch?v=49WXmzfOy4k

 

[grumpyvette]

How to Buy Re-manufactured Fuel Injectors
By an eHow Contributor
I want to do this! What's This?

When you have a fuel line problem or just want to optimize your fuel injection system, you can take advantage on deals on re-manufactured or refurbished fuel injectors. Fuel injectors are just one part that you can buy from reputable dealers to outfit your ride at prices below the standard new parts catalog retail rates. When you are buying re-manufactured, you have a lot to choose from, and a few things to keep in mind.
Difficulty: Challenging
Instructions

1.
Figure out your model numbers and compatible fuel injectors. Use your car manual and the model numbers on your fuel line parts. Identify fuel injector models that will fit into your system.
2.
Visit re-manufactured fuel injector retailers like Got Fuel Injectors or Fuel Injectors Direct online. These online vendors can help find the parts you need with good in-house inventories and convenient web portals.
3.
Find out what tests your re-manufactured fuel injectors go through. Vendors who re-manufacture fuel injectors use leak tests, spray pattern tests, and more to make sure the refurbished parts are up to the job.
4.
Look for a seal of approval from a fuel injector manufacturer. Find out whether techs who refurbish the products are certified by a major shop to assure that the re-manufactured fuel injectors meet the same standards as those shipped new.
5.
Check out any labeling issues. Ask about how your parts will be labeled so you can check their origin and quality. Those who ship re-manufactured parts will often include dates, test types, model numbers and more in the package or on the parts themselves.


Read more: How to Buy Re-manufactured Fuel Injectors | eHow.com http://www.ehow.com/how_4453138_buy-rem ... z0y7xKDUaq

related info

viewtopic.php?f=55&t=606&p=1865&hilit=injector+calculator#p1865

viewtopic.php?f=55&t=1241&p=2648#p2648

http://www.witchhunter.com/injectorcalc1.php4

http://www.scottsautorepair.net/viewtopic.php?f=10&t=33

http://www.injector.com/injectorselection.php

http://www.fuelinjectorconnection.com/s ... rcalc.html

http://www.witchhunter.com/injectorcalc1.php4

http://www.rceng.com/technical.aspx

http://www.slowgt.com/Calc1.htm#FPHP

http://www.iroczone.com/calcs/injectorsize.htm

http://www.injectorsplus.com/

http://www.csgnetwork.com/fiflowcalc.html

http://www.bgsoflex.com/pwcomp.html

http://golenengineservice.com/calc/calcpchg.htm

http://www.ecs.fullerton.edu/~sowell/ja ... estRig.pdf

http://www.witchhunter.com/injectorcalc1.php4

http://users.erols.com/srweiss/calcpchg.htm

http://fuelinjectorconnection.com/shop/ ... ductid=202

http://www.z31.com/software/injector.pl

http://www.solutions29.com/injcalc.htm

http://www.injectorrx.com/sizing.html

viewtopic.php?f=55&t=2055

Holley Injector Tech Said:

HIGH IMPEDANCE INJECTORS Most injectors can be divided into two major categories: high impedance 12 to 16 Ohms and low impedance 1.2 to 4.0 Ohms. The high impedance injectors are used with ECUs that are designed with saturation drivers. The advantage of using saturation drivers is that the currents running through the ECU circuits and the injectors are relatively low thus generating less heat. The disadvantage of saturation drivers is that the driver has a slower response time, which could affect the full utilization of such a system at very high engine RPM.

LOW IMPEDANCE INJECTORS The low impedance injectors are designed to be run with an ECU that employs peak and hold drivers (also called current sensing or current limiting drivers). The current ratio (peak to hold) is generally 4:1 and the most common drivers available are 4 amp peak/1 amp hold or 2 amp peak/ 0.5 amp hold. The peak current is generated to overcome the inertia of the closed valve and once the valve is open the driver cuts down to 1/4 of the peak current to hold the injector open until the end of the metering event. Low impedance injector designs are mostly used in high flow applications.

http://www.racetronix.biz/itemdesc.asp? ... 6x&eq=&Tp=

http://www.racetronix.biz/itemdesc.asp? ... 91&eq=&Tp=

http://www.racetronix.biz/items.asp?Cc= ... =1&Tp=&Bc=

fuel pressure is a MEASURE of resistance to flow, get a gauge and measure the fuel pressure on the fuel rail shrader valve, if your not, getting pressure. its because theres little or no resistance to flow, or your pumps not running and pumping fuel or the fuel pressure regulators leaking,
your leak is or should be rather obvious, if the upper end of the injector leaks fuel out of the fuel rail, very obviously the upper injector o-ring thats been installed is either incorrectly assembled or the wrong o-rings were used
verify the fuel pressure with a fuel gauge connected to the shrader valve on your TPI fuel rails,

GM part number for the complete fuel rail o-ring kit is 17111696

if your TPI FUEL PRESSURE REGULATOR DIAPHRAGM LEAKS youll find it difficult or impossible to be starting your car

heres a link to the correct o-rings they are light blue
NAPA sells them at times
all the o-rings on the fuel rails and injectors need to be dipped in thin oil so they insert and slide into place with less friction, this tends to greatly reduce the chance of the o-rings ripping, and yes you need the correct o-rings that fit correctly to begin with if you expect the rings to seal correctly
http://tpiparts.net/inc/sdetail/10950/300

17113544 - Injector Seals
17111696 - O-Ring Kit
22514722 - Fuel Inlet O-Ring
22516256 - Fuel Inlet O-Ring


The above part numbers provided me with all of the seals shown below circled in red. I would recommend that you replace these seals whenever you service your TPI system. Remember, you've got gasoline under about 45 pounds of pressure flowing through the fuel rails etc. A leak could easily catch fire and cost you your car.

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STOCK TPI,LTI,LSI ENGINES USE HIGH IMPEDANCE INJECTORS