Leon

Supposedly when injecting nitrous into carbed engines the corner cylinders tend to run the leanest especially with large amounts of nitrous is used.

Has anyone noticed anything similar with the ls1 intakes? Also has anyone noticed similar differences between the dry and wet kits?

thanks

2002SS

Dry kits are known for not being distributed evenly accross the pistons unless you have direct port nitrous. That is one of the fall backs of a dry system.

If you don't have the nitrous evenly distributed you can cause lean conditions on some cylinders and not on others.

Wet kits distribute the nitrous and fuel mixture more evenly accross the cylinders and tend not to crreat lean conidtions.

However, wet kits that are not installed correctly can creat puddling in the intake and cause problems there. But as long as you don't run your RPM switch lower then 2800, you will be fine in most cases with a wet kit.

My .02

Dan

Slowhawk

iTrader: (12)

With my wet kit the plugs look almost identical to each other.
2002SS-I read your sig.You must have the most modded 02 car out there. <img src="graemlins/gr_hail.gif" border="0" alt="[hail]" />
I'm jealous <img src="graemlins/gr_cry.gif" border="0" alt="[whiner]" />

1320

iTrader: (6)

The fact that one kit is wet and another dry has nothing to do with distribution.....none at all....

Fuel and nitrous have mass...it weighs something so it is effected by other things.....

The distribution problems stem from the manifold never being designed to carry a gas......nitrous or fuel.....nitrous actually has a better chance of being distributed more evenly than fuel. When nitrous is injected it leaves the nozzle at about -367 degrees and is a gas......fully suspend in air.........but fuel is really just small drops of fuel falling in the air and being carried....to the cylinders.....

No puddling can occur......there are no low spots that I no of in a fi manifold......fuel will just run down to the cylinder.....nowhere to puddle....

The dry system is a better design......sort of...since the fuel is supposed to be injected via the injectors.....so fueling is even.....well theoreticallly anyways....but you can t just trust the injectors ......like ls1 systems....but making sure extra fuel is added is an added comfort...

The track record for ls1 wet systems seem to be pretty good.......even though the manifold wasn t designed to carry fuel it seems to do a pretty good job.......I would go wet........unless I could make dam sure the inectors were picking up the slack on a dry system....which is another cost......

2002SS

Thanks Slowhawk..\

I am picking my baby up next week with all that stuff done to it. It should be a new animal. I will post my RWHP numbers as soon as I get it back. It is being widebanded on the dyno for tuning so I will have som SAE corrected numbers for you in another week.


Dan

Scalpel

iTrader: (4)

[quote]Originally posted by 1320:
<strong>The fact that one kit is wet and another dry has nothing to do with distribution.....none at all....

Fuel and nitrous have mass...it weighs something so it is effected by other things.....

The distribution problems stem from the manifold never being designed to carry a gas......nitrous or fuel.....nitrous actually has a better chance of being distributed more evenly than fuel. When nitrous is injected it leaves the nozzle at about -367 degrees and is a gas......fully suspend in air.........but fuel is really just small drops of fuel falling in the air and being carried....to the cylinders.....

No puddling can occur......there are no low spots that I no of in a fi manifold......fuel will just run down to the cylinder.....nowhere to puddle....

The dry system is a better design......sort of...since the fuel is supposed to be injected via the injectors.....so fueling is even.....well theoreticallly anyways....but you can t just trust the injectors ......like ls1 systems....but making sure extra fuel is added is an added comfort...

The track record for ls1 wet systems seem to be pretty good.......even though the manifold wasn t designed to carry fuel it seems to do a pretty good job.......I would go wet........unless I could make dam sure the inectors were picking up the slack on a dry system....which is another cost......</strong><hr></blockquote>

1320, I was just about to propose the same idea that neither dry nor wet should distribute "better" (more evenly) than another. Thanks for a good write up.

Chris Spiess

By puddling, I believe 2000ss was just referring to fuel drop-out. The point being that the fuel is no longer suspended and cannot be reliably distributed in the ratio which it was injected wit the nitrous. This is entirely possible and is a problem in carburated wet manifolds let alone EFI manifolds that were never intended to carry a 'wet' charge. The LS1/6 intakes seem to be okay with shots up to about 150 or so, but beyond that and I would start looking into setting up a direct port system if I were going to spray wet.
In theory, Dry systems are more effective on a properly tuned EFI motor with a fuel system that can keep up. This however gets expensive - fuel pumps, regulators, injectors, etc. Nobody ever said going fast was cheap though. <img src="gr_images/icons/wink.gif" border="0">
One other note, Nitrous Oxide boils at -88*C/-127*F.

BYBYC5

i run a 200 nx wet kit with ZERO probs (except keeping the bottle full) but a 150-175 wet kit seems to be more efficient,dont ask why but my time slips show it. i think its a fuel thing. <img src="graemlins/gr_judge.gif" border="0" alt="[judgement]" />

Chris Spiess

Grinch, are you saying your 150-175 shot times/dyno are better than your 200 shot numbers? Sounds like you've hit that limit we're talking about.

BYBYC5

im not sure what im saying , the 200 hits harder but my et and mph dont seem to change much at all if any.it THINK it is too rich. im in the prossess of getting bugg worked out of a H/C i put on and as soon as i can test it in gonna lower the fule let 1 by one till i get it right, im sure the n20 part is right but if i can just get the fuel optimized, OH BOY...BTW i was using NX's "suggestion" for the 200 jets so we all know how the "techs" on the phone are....more to come (when it stops raining) <img src="graemlins/gr_cheers.gif" border="0" alt="[cheers]" />

BYBYC5

dam i cant typ for **** i think i confussed myself when i read that post i just made lmao. what i ment to say in short was, when i can get a chance im gonna lower the fuel jetting 1 by 1 until i get it right. hope that helps hehe <img src="graemlins/gr_chug.gif" border="0" alt="[chug]" />