What's the next best step up from the 8.1s?
8.1 marine?
Are they plug and play?

 

next up from the 8.1's is the delphi 42lb's and yes they are plug and play +tune

 

I logged a pass last spring. The setup consisted of 5.3L, exhaust, cai, 75 of dry n2o. Added fuel thru PE on a track tune. The way I had the nitrous rigged up was no nozzle, just a 75 sized jet stuck in the line at the back of the cone that shot straight down the throat of the TB.

What's interesting is that in 2nd gear, I saw 100% DC @ 4900-RPM. By the shift point (6100), I saw 130% DC.

I wasn't running a wideband at the time, but my 02s are interesting. FLAT 1000 across the board. Though I don't have a WB for accuracys sake, do you think despite going over 100% DC, that the injectors did not lean out? Looks to be that way.

 

how many lbs. are the 8.1 injectors?? and where can you get them for 120 bucks...?

 

Good info man,
It sounds like it wasn't leaning out, but a lot of people say tho stock O2s can't be trusted.

But, it's still runnin right?

I'm not too worried about everyday driving with the stockers.
But, I'm pretty sure a dry shot is in my future

Lean + Nitrous =



$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$$$$$$$$$$$$

 

what was your afr and was it with the 5.3? that seems off,

i hit 90% with my 6.0 runing the 8.1injectors @ 13.0 afr acording to the lm1.

 

I wish my LM-1 had been working properly at the time, or I'd been able to get you A/F readings instead of the 02's. Sorry.
I upgraded to 44LBers, so no telling now.

 

closed loop, open loop and tuned VE? 13:1 yes.

Nothing off and every engine is different but have not seen a properly tuned truck with full bolt ons with a 220/220 112 run under 80% cositantly.

Here is a screen shot from super chevy show. Truck is an 04cc 5.3 full bolt ons tr220 and 8.1 injectors, AFR 13:1, VE is very high 118-120 up top...

http://i59.photobucket.com/albums/g2.../dutycycle.jpg

[IMG][/IMG]

 

https://www.performancetrucks.net/fo...15#post3485915

 

Well, I dropped my H/C 5.3L down to 55% with 44lb injectors.