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Is anyone on here running a direct port setup? I'm thinking about doing that using my SSV manifold. What are the do's and don'ts with running a direct port setup?
__________________ 03 Touring Daytona Blue
Tein - SSR /// - Kinetix - Megan - Greddy - JWT - Turbo XS - NOS - UR - Stillen - eBAY
If this is on a stock block, a standard "wet" shot will more than suffice without going boom (and well beyond the capabilities of stock short block). Seems like it would be a lot of work without any great benefit.
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"Racing makes Heroin addiction look like a vague wish for something salty." -- Peter Egan
Make sure everything is even (nozzle distance from ports, lines from dist blocks to nozzle, etc), jet them correctly, and have fun. The only negative on these cars I would think, is that you will never exceed the 150hp limit of a single fogger system due to the power capacity of the block, so you will spend a ton more money setting up direct port when it is not needed.
**** it, jet it for a 200 shot and see what happenes
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Old car: 06 Cobalt SS ..... New car: 08 Nismo, #1456
It was just an idea I had. I'm going to do pistons,rods,valves,springs,and cam in a few months. I'm not looking to spray more than a 150hp (.025" nitrous with .014 fuel jet on each fogger). I figure it will give me a little more reliable performance and would dress up the engine bay a little bit better for shows.
__________________ 03 Touring Daytona Blue
Tein - SSR /// - Kinetix - Megan - Greddy - JWT - Turbo XS - NOS - UR - Stillen - eBAY
I've always been under the impression direct port is a bad idea unless you're using a huge shot (something like 200+). reason being is if something goes wrong with any one of the fuel jets, such as a clog or something (which is more likely the smaller they are) then you'll have only air being sent into that cylinder which could be a disaster.
Let me preface this by saying I know little about NOS except how it works but I want to ask a question. I was talking to my mechanic (a Nissan certified master Tech) and he said the only way he would do NOS would be direct injection. As I understand it, his concern is that if you spray it into the intake there is a chance the front cylinders will get a higher concentration of NOS than the rear cylinders. In his mind, this was a very bad thing. In my mind, there are lots of folks ut there running regular off the shelf systems (foggers I guess). So, is my mechanic being overly cautious or are lots of folks just lucky? I saw this post and thought it a good place to ask.
It was just an idea I had. I'm going to do pistons,rods,valves,springs,and cam in a few months. I'm not looking to spray more than a 150hp (.025" nitrous with .014 fuel jet on each fogger). I figure it will give me a little more reliable performance and would dress up the engine bay a little bit better for shows.
If you're gonna build it, do a 200+ shot, don't pussy out
Quote:
Originally Posted by Gator
Let me preface this by saying I know little about NOS except how it works but I want to ask a question. I was talking to my mechanic (a Nissan certified master Tech) and he said the only way he would do NOS would be direct injection. As I understand it, his concern is that if you spray it into the intake there is a chance the front cylinders will get a higher concentration of NOS than the rear cylinders. In his mind, this was a very bad thing. In my mind, there are lots of folks ut there running regular off the shelf systems (foggers I guess). So, is my mechanic being overly cautious or are lots of folks just lucky? I saw this post and thought it a good place to ask.
The nitrous will distribute itself as well as the manifold is designed to distribute air normally. Unless the car has an issue from the factory with uneven cyl fill, it won't be a problem. On these cars, as well as everything flows, I wouldn't worry at all. Direct port is usually more hassle than it's worth, and it's always terribly expensive to achieve the same thing you can with a fogger.
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Old car: 06 Cobalt SS ..... New car: 08 Nismo, #1456
Last edited by Italianjoe1; 09-09-2009 at 08:09 AM.
Make sure everything is even (nozzle distance from ports, lines from dist blocks to nozzle, etc), jet them correctly, and have fun. The only negative on these cars I would think, is that you will never exceed the 150hp limit of a single fogger system due to the power capacity of the block, so you will spend a ton more money setting up direct port when it is not needed.
+1
Quote:
Originally Posted by Hostetler
It was just an idea I had. I'm going to do pistons,rods,valves,springs,and cam in a few months. I'm not looking to spray more than a 150hp (.025" nitrous with .014 fuel jet on each fogger). I figure it will give me a little more reliable performance and would dress up the engine bay a little bit better for shows.
Since you're doing all that, you should be able to do more than the standard 150. Plus, you can usually do slightly bigger shots with direct port.
Certain cams work better with nitrous than certain others. Have you looked into that?
Quote:
Originally Posted by Phenom
I've always been under the impression direct port is a bad idea unless you're using a huge shot (something like 200+). reason being is if something goes wrong with any one of the fuel jets, such as a clog or something (which is more likely the smaller they are) then you'll have only air being sent into that cylinder which could be a disaster.
While you make a valid point, as long as you've ensure everything was installed properly and operates as designed, you're most likely not going to run into any operational issues.
Quote:
Originally Posted by Gator
Let me preface this by saying I know little about NOS except how it works but I want to ask a question. I was talking to my mechanic (a Nissan certified master Tech) and he said the only way he would do NOS would be direct injection. As I understand it, his concern is that if you spray it into the intake there is a chance the front cylinders will get a higher concentration of NOS than the rear cylinders. In his mind, this was a very bad thing. In my mind, there are lots of folks ut there running regular off the shelf systems (foggers I guess). So, is my mechanic being overly cautious or are lots of folks just lucky? I saw this post and thought it a good place to ask.
What he said was true for the older cars and some cars now, because those intake manifolds weren't designed with as much R/D in internal airflow. Of course, our manifolds aren't perfect as our front 2 cylinders starve for air (so, your mechanic actually said it backwards). That's why the plenum spacer works.
Anyway, what he said is valid, but as far as our cars go, up to about 150 hp shot would be fine with a single, wet-shot fogger.
I tuned my car today using proven power's dyno...N/A I made 259.7whp 240tq with A/F ratio at 12.6:1....on the 75shot she made 306whp 303tq...and on the 100 shot she made 340whp 344tq..both nitrous runs were extremely rich with AFR dipping below 10.0:1..all i have to do is get a step smaller fuel jet and colder plugs.
for having 143k on her she seems to be doing just fine..Im waiting for some DR's to see what time she will put down at the track.
__________________ 03 Touring Daytona Blue
Tein - SSR /// - Kinetix - Megan - Greddy - JWT - Turbo XS - NOS - UR - Stillen - eBAY
What are you using for a tune? I am using utec and I'm having problems with the window switch.do you know if it works by completing a ground in the circuit or if it sends a voltage?
__________________ 03 Touring Daytona Blue
Tein - SSR /// - Kinetix - Megan - Greddy - JWT - Turbo XS - NOS - UR - Stillen - eBAY
yes its a spare solenoid control..it can be used for nitrous,meth,spare injector..ect..it can be controlled by rpm,boost level,coolant temp and a few more things i cant remember right now..lol
__________________ 03 Touring Daytona Blue
Tein - SSR /// - Kinetix - Megan - Greddy - JWT - Turbo XS - NOS - UR - Stillen - eBAY
Direct Port
