Dry Direct Port Question
Dry Direct Port Question This may be a noob question but I was wondering where does the added gas come from in a dry DP system. I know a regular dry shot goes through the MAF and that adds gas. On a wet kit there is a solenoid that adds the gas with the n2o. But my understanding is that DP kits shoot the n2o directly into the cylinder, so I dont see where the cpu could add the fuel. I always thought that dp kits were wet because of the reason I stated.
Educate me please.
Educate me please.
i would have to say that the only 2 ways i know of doing a dry direct port... is with either a harris speed works nitrous interface........ or COS5/aftermarket efi...... hope this helps.. i my self run the harris box and love it.. and i will be stepping up to a dry direct port this summer.. and using a 2nd harris box.. ..
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We ran one on DJ Loicaino's 'Stang back in the Fun Ford Street Renegade days. We were using a FAST system on his car at that time since BS3 wasn't out yet. I learned a lot from that setup to explore further on my own car. That's when I played with a converted 5.0 kit and got fuel from my pressure regulator by spiking it.
A dry directport is fine if you have the aftermarket software like ATV. The purpos of a directport is even distribution and individual cylinder tunning. With out having softwrae to where you can change fueling percentages to each cylinder through the injector it defeats the purpos.
In the past some have argued that you could take and adjust the nitrous jet up or down to dial in the airfuel if you had a cylinder burning differently than the rest. Well this defeats having equal distribution.
So unless you have an aftermarket computer you are much better off going with a wet directport to take advantage of what a directport is intended for.
Dave
In the past some have argued that you could take and adjust the nitrous jet up or down to dial in the airfuel if you had a cylinder burning differently than the rest. Well this defeats having equal distribution.
So unless you have an aftermarket computer you are much better off going with a wet directport to take advantage of what a directport is intended for.
Dave
A dry directport is fine if you have the aftermarket software like ATV. The purpos of a directport is even distribution and individual cylinder tunning. With out having softwrae to where you can change fueling percentages to each cylinder through the injector it defeats the purpos.
In the past some have argued that you could take and adjust the nitrous jet up or down to dial in the airfuel if you had a cylinder burning differently than the rest. Well this defeats having equal distribution.
So unless you have an aftermarket computer you are much better off going with a wet directport to take advantage of what a directport is intended for.
Dave
In the past some have argued that you could take and adjust the nitrous jet up or down to dial in the airfuel if you had a cylinder burning differently than the rest. Well this defeats having equal distribution.
So unless you have an aftermarket computer you are much better off going with a wet directport to take advantage of what a directport is intended for.
Dave
The street/strip style DP dry uses the injectors and the PCM via a controller like the Interface for fueling. Much easier to set up, safer and cheaper than a wet DP.
If you have your dry DP flowed like you should, having to individually tune your cylinders for a/f ratio like a WET DP will not be needed.
I can't believe the anti dry DP stuff that gets spewed around here, and it often comes from those promoting their plates of being able to spray a wet 300/400hp shot with no individual cylinder tuning, lol.
You must be able to read between the lines around here.
You can listen to the guys that actually run the dry DP as street.strip system, or you can listen to the incorrect info that some love to give out.
Your dry DP will in fact have closer temps and a/f ratios per cylinder than any style wet kit.
The reason most wet DP kits need individual tuning for a/f per cylinder is due the fact they pull the fuel from a common fuel rail, after the fuel noid, that needs to first fill up, then the supply it different to each hole according to plumbing. It makes me laugh, do we need to individually tune our n/a motors using the exact same injectors, no. The design allows for pretty even fuel supplies per hole where as the wet does not.
The Dry DP is much better for the average street/strip tuner running the Interface, than any wet nozzle, wet plate or wet DP, IMO, based on 30 years running the spray. Now if your going big time racing, then some of the after market controllers could be considered, but anything up to a 300 shot, no need at all. Stick with your guns and your thinking. Modern technology is your friend, and it is not the 1980's any longer, lol.
Robert
If you have your dry DP flowed like you should, having to individually tune your cylinders for a/f ratio like a WET DP will not be needed.
I can't believe the anti dry DP stuff that gets spewed around here, and it often comes from those promoting their plates of being able to spray a wet 300/400hp shot with no individual cylinder tuning, lol.
You must be able to read between the lines around here.
You can listen to the guys that actually run the dry DP as street.strip system, or you can listen to the incorrect info that some love to give out.
Your dry DP will in fact have closer temps and a/f ratios per cylinder than any style wet kit.
The reason most wet DP kits need individual tuning for a/f per cylinder is due the fact they pull the fuel from a common fuel rail, after the fuel noid, that needs to first fill up, then the supply it different to each hole according to plumbing. It makes me laugh, do we need to individually tune our n/a motors using the exact same injectors, no. The design allows for pretty even fuel supplies per hole where as the wet does not.
The Dry DP is much better for the average street/strip tuner running the Interface, than any wet nozzle, wet plate or wet DP, IMO, based on 30 years running the spray. Now if your going big time racing, then some of the after market controllers could be considered, but anything up to a 300 shot, no need at all. Stick with your guns and your thinking. Modern technology is your friend, and it is not the 1980's any longer, lol.
Robert
The street/strip style DP dry uses the injectors and the PCM via a controller like the Interface for fueling. Much easier to set up, safer and cheaper than a wet DP.
If you have your dry DP flowed like you should, having to individually tune your cylinders for a/f ratio like a WET DP will not be needed.
I can't believe the anti dry DP stuff that gets spewed around here, and it often comes from those promoting their plates of being able to spray a wet 300/400hp shot with no individual cylinder tuning, lol.
You must be able to read between the lines around here.
You can listen to the guys that actually run the dry DP as street.strip system, or you can listen to the incorrect info that some love to give out.
Your dry DP will in fact have closer temps and a/f ratios per cylinder than any style wet kit.
The reason most wet DP kits need individual tuning for a/f per cylinder is due the fact they pull the fuel from a common fuel rail, after the fuel noid, that needs to first fill up, then the supply it different to each hole according to plumbing. It makes me laugh, do we need to individually tune our n/a motors using the exact same injectors, no. The design allows for pretty even fuel supplies per hole where as the wet does not.
The Dry DP is much better for the average street/strip tuner running the Interface, than any wet nozzle, wet plate or wet DP, IMO, based on 30 years running the spray. Now if your going big time racing, then some of the after market controllers could be considered, but anything up to a 300 shot, no need at all. Stick with your guns and your thinking. Modern technology is your friend, and it is not the 1980's any longer, lol.
Robert
If you have your dry DP flowed like you should, having to individually tune your cylinders for a/f ratio like a WET DP will not be needed.
I can't believe the anti dry DP stuff that gets spewed around here, and it often comes from those promoting their plates of being able to spray a wet 300/400hp shot with no individual cylinder tuning, lol.
You must be able to read between the lines around here.
You can listen to the guys that actually run the dry DP as street.strip system, or you can listen to the incorrect info that some love to give out.
Your dry DP will in fact have closer temps and a/f ratios per cylinder than any style wet kit.
The reason most wet DP kits need individual tuning for a/f per cylinder is due the fact they pull the fuel from a common fuel rail, after the fuel noid, that needs to first fill up, then the supply it different to each hole according to plumbing. It makes me laugh, do we need to individually tune our n/a motors using the exact same injectors, no. The design allows for pretty even fuel supplies per hole where as the wet does not.
The Dry DP is much better for the average street/strip tuner running the Interface, than any wet nozzle, wet plate or wet DP, IMO, based on 30 years running the spray. Now if your going big time racing, then some of the after market controllers could be considered, but anything up to a 300 shot, no need at all. Stick with your guns and your thinking. Modern technology is your friend, and it is not the 1980's any longer, lol.
Robert
The fact of the matter is that different intake manifolds have different airflow characstics. The airflow to each runner will vary. These cylinders see different temps. So Nitrous aside this can even be a NA issue.
Now add alittle nitrous to the puzzle and the issue gets worse. Why? Because power is made by burning fuel. It takes airflow to burn fuel. Increase the airflow into the intake and the burn rate changes. The reason for being able to individualy tune each cylinder has to do with fueling the cylinder to match the airflow and nitrous flow.
The porpus of a directport has always been one thing. The ability to individually tune each cylinder. You can not do this with a dry directport and stock computer. Plain and simple.
If you want to choose a half *** way to be cheap thats up to you. But if you want to do it right and run a dry directport you need an after market computer in the car.
Dave
Last edited by Nitro Dave's Nitrous Outlet; Apr 29, 2009 at 10:38 AM.
I dont want to get in the middle of yours and Roberts pissing match
just asking. 
You insinuate that I have never set up a dry direct port and that I do not know what I am talking about so I am going to call you out on that one.
Yes we have set up many dry direct ports. We would never ever do one the way you suggest doing it though. The reasons why are covered above.
Now let’s talk about experience. You like to throw your age around insinuating it means you have a lot of and more experience than me. So let’s clear that one up. I have been a technical advising sponsor on this board since 2002. No I am not near as old as you but this does not mean that I do not have more knowledge than you.
See I have done this everyday of my life for over the last 10 years as my profession. This does not include what I done before it became my profession.
I happen to remember when you started posting here. I can tell you based off the questions you were asking me and NX Ricky and the lack of knowledge you had you had not been successfully using nitrous for 20 -30 years. Now you have came along way and Ill give credit where credit is due but you still have along way to go before trying to compare your knowledge against mine.
The fact that you hurt your personal car 3 times last year and have yet had any good results using the advice you give others is a perfect example for what I am talking about.
I have successfully built many cars and tuned them for our customers with nothing but great results. In the last 10 years I have hurt one car and it was due to a voltage issue in the car. It was my personal car. Now I am not talking about 5, 10, 15 or even 20 cars.... I am talking a **** load of cars. I have worked with everything from Drag boats, Drag cars, street cars, motorcycles, go carts, mud trucks, long mile cars and the list goes on. If I did not know what the hell I was talking about there would be a **** load of people talking about how I blew there car up. Instead all you will find is how great we are. There is a reason for that.
Now if you have a difference in opinion on how you like doing things that’s fine. I have no issue with that. But do not insult my integrity or knowledge in the process of arguing your methods. Do it in a clean and technical manner so we can all continue to have fun here. I will do the same.
Thanks
Dave
Yes we have set up many dry direct ports. We would never ever do one the way you suggest doing it though. The reasons why are covered above.
Now let’s talk about experience. You like to throw your age around insinuating it means you have a lot of and more experience than me. So let’s clear that one up. I have been a technical advising sponsor on this board since 2002. No I am not near as old as you but this does not mean that I do not have more knowledge than you.
See I have done this everyday of my life for over the last 10 years as my profession. This does not include what I done before it became my profession.
I happen to remember when you started posting here. I can tell you based off the questions you were asking me and NX Ricky and the lack of knowledge you had you had not been successfully using nitrous for 20 -30 years. Now you have came along way and Ill give credit where credit is due but you still have along way to go before trying to compare your knowledge against mine.
The fact that you hurt your personal car 3 times last year and have yet had any good results using the advice you give others is a perfect example for what I am talking about.
I have successfully built many cars and tuned them for our customers with nothing but great results. In the last 10 years I have hurt one car and it was due to a voltage issue in the car. It was my personal car. Now I am not talking about 5, 10, 15 or even 20 cars.... I am talking a **** load of cars. I have worked with everything from Drag boats, Drag cars, street cars, motorcycles, go carts, mud trucks, long mile cars and the list goes on. If I did not know what the hell I was talking about there would be a **** load of people talking about how I blew there car up. Instead all you will find is how great we are. There is a reason for that.
Now if you have a difference in opinion on how you like doing things that’s fine. I have no issue with that. But do not insult my integrity or knowledge in the process of arguing your methods. Do it in a clean and technical manner so we can all continue to have fun here. I will do the same.
Thanks
Dave
In my opinion the reason for a directport is to equaly deliver the same amount of nitrous to each runner. Evenly distributing the power to each cylinder. Adjusting up and down the nitrous flow to tune cylinder temperature is not the right way to do this.
The right way would be to adjust fuel delivery or spark.
Aggree or disagree?
Dave
Last edited by Nitro Dave's Nitrous Outlet; Apr 29, 2009 at 11:19 AM.
This may be a noob question but I was wondering where does the added gas come from in a dry DP system. I know a regular dry shot goes through the MAF and that adds gas. On a wet kit there is a solenoid that adds the gas with the n2o. But my understanding is that DP kits shoot the n2o directly into the cylinder, so I dont see where the cpu could add the fuel. I always thought that dp kits were wet because of the reason I stated.
Educate me please.
Educate me please.
As for individual cylinder tuning, it is possible on a dry direct port, but more often then not, it will not be necessary. i run a 200 shot on my dry DP, variations per cylinder were so small, they did not require any tuning. Even it was, injector matching allows some degree of per cylinder tuning.
I think a Dry dp is great right out of the box, we flow ours before they go out the door and feedback has been great on them. Very little if any tuning per cylinder is necessary. We have seen more variations per cylinder with a wet dp than a dry one. It is accurate that a wet dp is easier to tune per cylinder then a dry, when tuning is necessary. You also have to remember a dry dp is more cost effective then the wet as well. It may not give you a perfect A/F per cylinder, but it will do a better job then a plate or nozzle kit. Just think about which kit you would get better distribution with, a wet plate/nozzle versus a dry direct port.
LOl.. As I have argued since day one that is one way to do it but not the BEST way.
In my opinion the reason for a directport is to equaly deliver the smae amount of nitrous to each runner. Evenly distributing the power to each cylinder. Adjusting up and down the nitrous flow to tune cylinder temperature is not the right way to do this.
The right way would be to adjust fuel delivery or spark.
Aggree or disagree?
Dave
In my opinion the reason for a directport is to equaly deliver the smae amount of nitrous to each runner. Evenly distributing the power to each cylinder. Adjusting up and down the nitrous flow to tune cylinder temperature is not the right way to do this.
The right way would be to adjust fuel delivery or spark.
Aggree or disagree?
Dave
I agree, Not sure I would try a Dry DP with a stock computer ... we did some pretty big dry shots with mine years ago but the FAST is MUCH BETTER.
