Correct Injectors?
10-26-2004 | 06:45 PM
#1
10-27-2004 | 01:39 PM
#3
12 Second Truck Club
Joined: Oct 2002
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From: Salt Lake City, Utah
Originally Posted by Zick
After some searching it sounds like these will bolt in but I still could not find the #lb rating on these?
What mods do you have? Are you going lean because your injectors are maxed?
10-27-2004 | 02:11 PM
#4
Originally Posted by Black Blown 02
Yes, they will drop in.
What mods do you have? Are you going lean because your injectors are maxed?
What mods do you have? Are you going lean because your injectors are maxed?
Right now no major mods, but from what I've been reading it sounds like people have been swapping out 99' injectors for 00'+ because they flow a little more and are a better design.
I was planning on getting a custom tuned PCM to compensate for these or am I way off base thinking here. Am I going to run rich, are these too much flow, or should I just stick to finding some 00'-02' from a 5.3?
10-27-2004 | 02:48 PM
#5
12 Second Truck Club
Joined: Oct 2002
Posts: 1,677
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From: Salt Lake City, Utah
Originally Posted by Zick
Right now no major mods, but from what I've been reading it sounds like people have been swapping out 99' injectors for 00'+ because they flow a little more and are a better design.
I was planning on getting a custom tuned PCM to compensate for these or am I way off base thinking here. Am I going to run rich, are these too much flow, or should I just stick to finding some 00'-02' from a 5.3?
I was planning on getting a custom tuned PCM to compensate for these or am I way off base thinking here. Am I going to run rich, are these too much flow, or should I just stick to finding some 00'-02' from a 5.3?
10-27-2004 | 03:48 PM
#6
These injectors will flow roughly 24.5#s compared to your 99s which flow about 21.5#s. They are a direct swap in with no special modifications needed.
You need to either run a 2000+ year PCM or get a custom tune with an 00 or 01 year base tune. You'll find that even on a stock truck that the base tune on a 99 model is very faulty. It gets excessive knock retard, has low timing, and feels sloppy in general. Even running LS1 Edit to increase my timing lower knock didn't fix all the issues.
I recently helped a guy get new injectors and PCM up on his near stock 99 truck. He said that its a night and day difference and runs better than it ever has before. More power, more throttle, more crispness, better mileage ... This was a stock 00 tune with those same injectors on a stock truck.
You need to either run a 2000+ year PCM or get a custom tune with an 00 or 01 year base tune. You'll find that even on a stock truck that the base tune on a 99 model is very faulty. It gets excessive knock retard, has low timing, and feels sloppy in general. Even running LS1 Edit to increase my timing lower knock didn't fix all the issues.
I recently helped a guy get new injectors and PCM up on his near stock 99 truck. He said that its a night and day difference and runs better than it ever has before. More power, more throttle, more crispness, better mileage ... This was a stock 00 tune with those same injectors on a stock truck.
10-27-2004 | 04:00 PM
#7
12 Second Truck Club
Joined: Oct 2002
Posts: 1,677
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From: Salt Lake City, Utah
Originally Posted by BigTex
These injectors will flow roughly 24.5#s compared to your 99s which flow about 21.5#s. They are a direct swap in with no special modifications needed.
You need to either run a 2000+ year PCM or get a custom tune with an 00 or 01 year base tune. You'll find that even on a stock truck that the base tune on a 99 model is very faulty. It gets excessive knock retard, has low timing, and feels sloppy in general. Even running LS1 Edit to increase my timing lower knock didn't fix all the issues.
I recently helped a guy get new injectors and PCM up on his near stock 99 truck. He said that its a night and day difference and runs better than it ever has before. More power, more throttle, more crispness, better mileage ... This was a stock 00 tune with those same injectors on a stock truck.
You need to either run a 2000+ year PCM or get a custom tune with an 00 or 01 year base tune. You'll find that even on a stock truck that the base tune on a 99 model is very faulty. It gets excessive knock retard, has low timing, and feels sloppy in general. Even running LS1 Edit to increase my timing lower knock didn't fix all the issues.
I recently helped a guy get new injectors and PCM up on his near stock 99 truck. He said that its a night and day difference and runs better than it ever has before. More power, more throttle, more crispness, better mileage ... This was a stock 00 tune with those same injectors on a stock truck.
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10-27-2004 | 04:23 PM
#8
No they aren't maxxed out stock, but they only support just over 300 rwhp NA. The big issue is the 99 tune. It stinks. Even with Edit its hard to make a 99 run GOOD. They have some major issues with very bad knock retard and the stock timing is very low. By moving to a 01 PCM, you don't have to deal with the knock issues, as GM has most of the bugs worked out by now. Torque management is more an issue in 01 than 99, but if you have a 99 you aren't making as much power as you could be, so its a wash. TM can be tuned out though. Since the 01s use those larger 24.5# injectors, its easy to swap PCMs and injectors.
My near stock 99 Z71 5.3 dynoed 218 at the rear in 2nd gear. An 01 with similar mods (muffler, hypertech, and K&N filter) will make 30+ more HP than that. A little bit of that power is in the slightly larger cam, but the rest is in the tune.
I told slowprocess to have his 99 truck custom tuned with an 01+ version. I think he's happy with the results. Of course he doesn't know how much the PCM helped since he swapped motors, trans, converter, headers, and exhaust at the same time.
My near stock 99 Z71 5.3 dynoed 218 at the rear in 2nd gear. An 01 with similar mods (muffler, hypertech, and K&N filter) will make 30+ more HP than that. A little bit of that power is in the slightly larger cam, but the rest is in the tune.
I told slowprocess to have his 99 truck custom tuned with an 01+ version. I think he's happy with the results. Of course he doesn't know how much the PCM helped since he swapped motors, trans, converter, headers, and exhaust at the same time.
10-27-2004 | 05:27 PM
#9
Originally Posted by BigTex
These injectors will flow roughly 24.5#s compared to your 99s which flow about 21.5#s. They are a direct swap in with no special modifications needed.
You need to either run a 2000+ year PCM or get a custom tune with an 00 or 01 year base tune. You'll find that even on a stock truck that the base tune on a 99 model is very faulty. It gets excessive knock retard, has low timing, and feels sloppy in general. Even running LS1 Edit to increase my timing lower knock didn't fix all the issues.
I recently helped a guy get new injectors and PCM up on his near stock 99 truck. He said that its a night and day difference and runs better than it ever has before. More power, more throttle, more crispness, better mileage ... This was a stock 00 tune with those same injectors on a stock truck.
You need to either run a 2000+ year PCM or get a custom tune with an 00 or 01 year base tune. You'll find that even on a stock truck that the base tune on a 99 model is very faulty. It gets excessive knock retard, has low timing, and feels sloppy in general. Even running LS1 Edit to increase my timing lower knock didn't fix all the issues.
I recently helped a guy get new injectors and PCM up on his near stock 99 truck. He said that its a night and day difference and runs better than it ever has before. More power, more throttle, more crispness, better mileage ... This was a stock 00 tune with those same injectors on a stock truck.
10-27-2004 | 05:31 PM
#10
You can have a dealership (or someone with the tools like a tuner) flash your current PCM with the VIN of a 00 year truck. Just make sure its the same style truck (example- 2000 Chevy 5.3, 4wd, manual transfer case).