96-99 454 Vortec owners?

[bankspowered98]

Before the SC I never even ran one. I did install a Helix Power Tower which seemed to help out some on towing and throttle response. If you are going to buy a CAI kit, I would recommend the K&N one. Its around $200.00 I beleive on ebay but it includes the necessary parts that attempts to isolate the air filter from as much engine heat as possible. The Airaid, correct me if I am wrong, but it is basically just an elbow and a filter?


On another note, I'm thinking about adding some extra juice to the truck.... which nitrous kit do you all recommend. I have ran COMPUCAR and HOLLEY before on my LS1, I am thinking about going ZEX this time. Any ideas?

[DeMartino17]

here is the airaid one.
looks kind of like something i could fab up on my own if i had the resources haha.

[elkhunter]

Earlier somewhere in this post the K&N was being bashed for letting too much trash through. The parts store I use here even told me that if you use the K&N on a Dodge diesel they void the warranty.

[bankspowered98]

De, I think that one would be a waste of $150 bucks in my opinion.

[skills4lou]

What does removing the torque management gain you? What does it do?

Thanks guys.

[DeMartino17]

Originally Posted by bankspowered98

De, I think that one would be a waste of $150 bucks in my opinion.

i agree.

i think while i'm at it, im going to replace my valve cover gaskets because they are leaking.

what should i use to clean the block off where the oil has leaked down over time?

[dietzster]

Will just putting in the pre-2000 ls-1 injectors actually get you any more power up top? Has anyone done this mod yet? I can't see injectors alone making more power unless the engine has been modded from stock. And how can you put in larger injectors and not need to tune for them as previously stated? If anyone has any info please let me know, I have a buddy with these injectors for cheap but am debating weather or not to try this out, my stock injectors are ok right now but I am looking for more power while I wait to find a whipple charger.

[thebigcheez]

woot

[bankspowered98]

The injectors do give you a bit more power. Our injector as NODIH discussed earlier are maxed out on our motors, even if you leave them stock. THe LS1 injectors gave me a bit of a boost right off, with a little computer tune you should be able to tell. I never ran mine without a tune but you still may notice some added power. They are a drop in replacement so no check engine light or anything will come on if you do choose to install the Pre-2000 injectors. I beleive they are 24-26lb.

You might try and spray some purple power on the block and let it sit for a bit... or some brake clean. Make sure the engine is cold though. Dont do it while its hot otherwise you might have one hell of a campfire in your driveway.

[dietzster]

Yeah I've been doing alot of reading, I found out the LS1 injectors are rated like this
1998 are 28.8 lbs at 4 bar
99-00 are 26.2 lbs at 4 bar
01-02 are back to 28.8 lbs at 4 bar (with different part numbers)
I guess that is why no tune is needed on the 99-00 injectors because at 3 bar they are basically the same as our stock injectors.
I think I will try this and see how it turns out, the injectors I can get are the 28.8 lb ones from a 98 WS6.

[bankspowered98]

You should be good to go with those. Sounds like you got it covered. One other things, before you do the install, contact your local gm dealership and order some metal injector clips that hold the injector onto the rail. You will probably have to wait a day or so and the kit for all 8 should be 17 bucks or so. I broke 3 of mine last time and had the truck down waiting on the parts.

[N0DIH]

You will notice it shifts more like it should. And if you go doing much messing with the main timing tables and not restrain what TM is going to do, it will just fight the heck out of you. I did mess with a tune on mine and forgot to keep TM in check and couldn't figure out why I was so "slow" feeling. Disabled TM and the truck feels like it gained 50 hp back. And I can pull out in traffic now with serious authority now.... And WOT pulls great now.

Originally Posted by skills4lou

What does removing the torque management gain you? What does it do?

Thanks guys.

[N0DIH]

Close, stock 454 L29 injectors are 18ish @ 3 bar, and 22 @ 4 bar, LS1 injectors (99-00) are 22 @ 3 bar. And LS1/LS6 from 01-up are 28.8 @ 4 bar, 24 @ 3 bar (same as LT1). The PCM should be able to handle the LS1 stock injectors fine, but it will run on the rich side on the LTFT's, so you might need to dial them back, talk to Lyndon, he will tell you for sure. I found a chart that looked good and fancy, but was dead wrong, just try to tune a car with what you think are larger injectors than you have, and tell the PCM you have larger, it will hose a lot up....

GM really like the 18 and 19 lb injectors, the Cadillac 4.5L and 4.9L's got them, the 305 TPI's got them, the L99 4.3L/265's got them and the L29 454's got them. The Cadillac ones had a lot of problems with windings shorting out. The L29 ones leaked and were just plain poor quality, and really just plain too small for a 454 if you do any mods.

The V6's and 5.7 V8's got larger injectors, 22-24 lb/hr, TPI (22) and LT1 (24), the SC 3800's got 36's. I think GN Regals and 89 TTA's got 36's too.

Originally Posted by dietzster

Yeah I've been doing alot of reading, I found out the LS1 injectors are rated like this
1998 are 28.8 lbs at 4 bar
99-00 are 26.2 lbs at 4 bar
01-02 are back to 28.8 lbs at 4 bar (with different part numbers)
I guess that is why no tune is needed on the 99-00 injectors because at 3 bar they are basically the same as our stock injectors.
I think I will try this and see how it turns out, the injectors I can get are the 28.8 lb ones from a 98 WS6.

[dietzster]

NODIH, where do you find your injector info? I would like to find a good site that has all the flow rates to compare side by side and know for sure what the actual rates are, not what people think they are, (as you know there is alot of conflicting info on the net). I found those rates on the ls1tech forum and they said the 98's also had 28.8 lb injectors but it would be nice to be albe to type in a part number and find out for sure. Also did you totally disable the TM in your truck, I now have a trans-go HD-2 reprogram kit in my truck and the TM reduced but was thinking of totally getting rid of my TM, I do have a heavy 5th wheel and am not sure if the trans would hold but I can't see why it wouldn't. Let me know your thoughts, thanks

[bankspowered98]

I completely removed mine and I normally pull a 32ft Enclosed to the race track every weekend without a problem.

[N0DIH]

I completely yanked mine, stock 4L80E. Just zero out the tables for torque steps.

Look for all the torque reduction tables and just zero them, it will be gone.

I dug and dug around, and ultimately tossed in a set of LS6 injectors and confirmed it to be 24.87 @ 3 bar, same as the LT1. But what I found on the net was wrong, it showed 28.8 @ 3 bar, which was incorrect.

It is sure hard to fight internet folklore, once it gets spread hard to decipher. I just did a lot of comparison, look at stock calibrations (that proves a lot) and was able to find out what was right and what wasn't.

Note these values are the PCM values not the actual flow rate of the injector.
Stock L29 454: 22.3 lb/hr @ 4 bar (so 19.3 @ 3 bar)
Stock 98 A4 F-Body: 0-10 kPa 28.7 lb/hr, 90-100 kPa 31.4 lb/hr
Stock 01 LQ4 6.0L Truck: 25.2 lb/hr
Stock 03 8100 V8: 29.9 lb/hr
Stock 97 Regal GS L67: 38.4 lb/hr
Stock 2000 4.3L V6: 38.4 lb/hr

[dietzster]

Well I got some new injectors on the way, I got #12561462 they are 28.8 lbs @ 4 bar, sweet deal brand new take outs for $50. I'm out of town for a bit but I will repost after the install and retune and let you know how it works.

[N0DIH]

Where did you get them? I need to get me another set for my 454 too.

Originally Posted by dietzster

Well I got some new injectors on the way, I got #12561462 they are 28.8 lbs @ 4 bar, sweet deal brand new take outs for $50. I'm out of town for a bit but I will repost after the install and retune and let you know how it works.

[dietzster]

Found them on e-bay, there was a few sets on there earlier this week, all went from 50-85 bucks. The set my buddy had he thought were 28.8's ended up being the 26.2's, good thing I double checked first, I found a real good site for injector flow rates and it seems to be one of the only ones that is right about the flow rate on these injectors rated at 4 bar, www.witchhunter.com lots of other good info too.

[N0DIH]

Yup, he is good, and fiveomotorsports too, email them with questions and they usually get back to you, and witchhunter knows the L29 injectors well and says OEM ones is best to avoid.

Originally Posted by dietzster

Found them on e-bay, there was a few sets on there earlier this week, all went from 50-85 bucks. The set my buddy had he thought were 28.8's ended up being the 26.2's, good thing I double checked first, I found a real good site for injector flow rates and it seems to be one of the only ones that is right about the flow rate on these injectors rated at 4 bar, www.witchhunter.com lots of other good info too.