Hey guys Im trying to decide between nitrous works tpi system or the nitrous express system. I have ruled out the NOS because the power level starts at 100hp, which is a little too much for my car in my opiion. What i was interested in is how do the systems enrich the fuel mixtures? also it seems as if the nitrousworks uses a plate behind the tb but the nitrous express uses a y fogger nozzle. any thought on these differences? thanks in advance. -mike
btw the car is a 1992 350 tpi trans am

 

any "plate" style system is what is called a wet kit. The "fogger" type nozzles deal is a dry kit. That's one thing. Second, I personally am a fan of wet kits b/c IMO the set-up looks better. It is a tad safer to run a dry kit b/c you just spray N20 and no fuel. So, you can run 2 solenoids in series and that acts a safety if one were to stick open. But I still prefer the wet kit (and have always used them on my cars)

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Alex A. (aka chevyboy)
1992 Z-28 L98/1LE. Heritage Edition. SLP runners, gutted cats, SLP 3" cat-back & muffler. 3" flo-tech cut-out, SLP TB foil, K&N filter @ TB, 3.23 posi rear.

 

I though a wet system would be safer because it also injects extra fuel to prevent a lean mixture? The fogger is shaped in a y form with two inlet and one outlet, I thought that fuel and nitrous are injected through these inlets and are mixed together while being injected into the motor??? or am i confused? Also if in a dry system only nitrous is injected then how does the motor compensate for this by adding fuel? If no extra fuel is added wouldnt I melt a piston or worse?

[This message has been edited by mhaskell (edited October 02, 2001).]

 

I used a NOS system on my 89 350 TPI. Had no problem and it didn't take long for me to put the 150hp. jets in. The fogger nozzle you are talking about also is a wet system. It injects fuel and nitrous. I don't know of any advantage to either way. I had the plate 150hp was alot of fun, not enough so I did a new motor and also transfered my NOS over. Don't be scared of it, the only thing you need to look out for is droping fuel pressure. The NOS kit has their Fuel jets plenty big so it's pretty safe but you still need adequate pressure. Just do a Nitrous run with a guage connected and see if it falls. P.S. Both wet and dry kits are safe they are just designed differently. Dry kits just use a different method to enrich the mixture (suchas a booster fuel pump).

[This message has been edited by 89406Iroc (edited October 02, 2001).]

 

Kits wth fogger nozzles are indeed "wet systems" as are most (but not all) plate systems.

A "wet system" is a system that has a fuel solenoid, fuel jet and fuel nozzle or spraybar in addition to the nitrous solenoid, jet and nozzle or spraybar.

A dry system flows only nitrous.
The additional fuel is suplied by the engines previously existing fuel injectors. Some systems do this by applying some of the bottle pressure of the nitrous system to the fuel pressure regulator to increase fuel pressure when the nitrous is activated. The increased fuel pressure pushes more fuel through the fuel injectors. These systems often need an extra inline fuel pump to supply the extra volume and pressure needed.

Other "dry systems" do not raise fuel pressure. They pulse the fuel injectors for a longer period of time while spraying nitrous. Some do this with "piggyback" PROM chips in the ECM. Some intercept the fuel injector pulse from the ECM to the injectors and lengthen it.

Many aftermarket ECMs have programable fuel enrichment for dry nitrous systems.


I like NX.
Very high quality components!!!
NX rates there kits by rear wheel horsepower. The kit I bought included jets for 50, 75, 100, 150 HP. I think they now include 35 HP too.
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Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

EFI Performance Club on Yahoo

[This message has been edited by IROCKZ4me (edited October 13, 2001).]

 

If your engine is in good shape it should be able to handle a 150 hp shot. I'd get a chip from someone who has setup a tpi with Nitrous. If you still have stock injectors I'd have them cleaned and tested. If an injector plugs and your spraying, that piston will melt in no time.
With a tpi I'd go with a dry system. If you have 22 lb injectors multiply by 8 and your injectors have the ability to supply the engine with 176 lbs of fuel per hour or roughly 3 lbs per minute. (your tank holds about 115 lbs of fuel)

 

96Ibs is closer, but I know you were estimating.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System