Well a few months ago all the hard racing on a stock fuel pump with mods and a tune chucked the fuel pump. Put in a racetronix pump and was about to FINNALY put the nitrous in and about once a week it throws a rich fuel on left bank code or whatever. Everyone has said its more then likley an injector cloging and when I first got the car out this summer I ran the best fuel injector cleaner threw it money could buy. I do know they are stock injectors. Maybe with the Mad Z tune and the new fuel pump they are just old and can't keep up or something? Can anyone recomend a good injector for a stock internal LT1 with a racetronix? What kind of power gains do you tipicaly see AFTER a tune with a good pump and injectors or hardley any at all?

 

You won't see anything unless the injectors are at 100% duty cycle. If they are beyond the limit, though, the top-end gains could be substantial, since the engine could be starved for fuel at peak hp.

How much nitrous are you running and what else do you have done?

 

A pump and injectors will gain you no power only restore what is lost to failing parts. What you should buy depends on future plans and anything besides stock injectors will need a tune even if they are the same rating. The SVO injectors are good and popular if absolutely staying with a stock heads and cam the 24# would work fine, if maybe diving into the engine then consider 30 or 36#. Racetronix also sells injectors which would be another option.

Just avoid Accel and know that LS1 injectors are rated at higher pressure so a 28# LS1 injector is roughly the same size as an LT1 24# when run at our fuel pressure.

 

First, get the exact code..... might not seem important, but its not "whatever". It may be the key to what's wrong.

Second, how would a "cloging" injector cause a rich fuel code (or whatever)?

You need to sort the problem out, not just throw a new set of injectors at it and hope it solves the problem.

Adding a little more info on the car, its specific mods, type and size of nitrous system might also help people respond.

 

Well I was thinking about jumping up the injectors because I am wanting to run a 150 wet shot but if the injectors are fine I may leave it but have had a lot of guys recomend I jump them up and thats the main reason i was asking. Right now I have an NX wet kit jetted to 75 100 and 150.
Magnaflow, CAI, mad Z tune, msd wires, TR-6 plugs, 3.42's, racetronix fuel pump, weight mods and suspension parts just the basics for now. I was going to try and go back to autozone in the morning and the the exact code. I do know last I ran it it said left bank rich. I do know the TR-6's need replacing soon.
I am engaged now so I don't plan on tearing into the motor for at least two years and she is moving up this weekend and my beater is down so once she gets up here I do plan to get new plugs in and get a few other ods and ends done.

 

No need to "bump up" the injector size with a NX wet kit. "Wet" means the nitrous kit adds the extra fuel you need to run the nitrous (via a fuel line tapped into your fuel rail). A dry kit relies on the existing injectors to add the fuel (by bumping up the fuel pressure).

 

The code was a 172 (96 car OBD 2). I had the same guy come out at Autozone as before just to see what he would say last time he said "well it says bank 1 to rich so its probably a cloged injector" I am thinking well they are original so maybe but maybe an O2. He give me the code reader and I check it and its the same code and he goes "I bet you its a bad O2 sensor" (hmmm thought it was an injector buddy). I then erased the code because it only pops up about once every 1.5 weeks and I got a stern talking to about how the EPA does not want you clearing codes untill the problem is fixed and you can get fined $6,000 and whats funny is when he hinself look at the code two weeks ago he erased it hmmmm.

 

Pull your injectors out of the intake. Remove the coil wire. Have someone turn the key over. Watch all your injectors to see if they are spraying correctly.

Z