I have a question to ask some of the experts on this board. I have a GSR powered 93 civic hatch that I build for a road course, but I also enjoy the ocasional red light challange from the bigger v8's or VR6's. Since my car has a weight advantage as well as power advantage form the modifications I have done, most of the time a stock to slightly modified v8 is not really a challange, but on ocasions, such as recently with a z06 I would like to have something extra to be competitive. Since I have also tuned my motor to the setup that I currently have I would like to keep the computer as well as the fuel setup as it is. Now for the question is it possible to add a 60hp shot or so of NOS and still be reliable? I know that on a stock motor this would be no problem since I ran 75 shot (zex) on my ITR befor, but with my modifications will it work and what should I be condered with? Also which system should I go with, dry, single wet, or 4 fogger as well as what company? As for my list of mods, is as follows:

Jun stage 3 cams
ITR valves
upgraded valve train (9200rmp cut off)
11:1 CR (JDM GSR pistons, mugen HG, slightly shaved head)
Skunk 2 intake manifold
ITR TB
DC 4-1 header
2" exhaust
ACT clutch
ITR fuel pump

Thanks for your help.

 

damn.........you got some high compression. adding n2o would be pretty risky...........you probably can do it but it would require alot of fine tuning and monitoring. you have to probably sarafice some N/A power for saftey. like retarding the timing. running colder plugs and running it a little bit richer.

a NOS direct port 4 fogger system would be the best. NOS is simply the BEST nitrous kit avalible. they have been around for a very long time and all the top drag racers use them.

zex would be the next system to look at but it's just a single fogger dry system. pretty safe but i think it would require more tuning and saftey on a set up like yours.

venom is a POS dont even go there.

with a NOS direct port system you have 4 percicley tuned injectors mounted into each intake runner with the right amount of fuel and n20 being injected into the engine. no worry's about not getting the proper mixture to the cylinders from those single fogger system's.

you can easily put in slightly larger fuel jet's into the NOS injectors for added saftey. just make sure you have a strong enough fuel pump to feed the NOS system.

only down side to this type of system is the cost and the ammont of time for installation. the intake manifold has to be removed to install the NOS injectors.....lots of fuel and NOS lines need to be made etc....

hope this helps...........

 

Thanx for the informative reply. I did consider NOS to be the best system out there because of their experience, but when I called their technical support line they told me that I should go with their dry kit since I am not planning on using too big of a shot. I guess my question comes down to, is it posibel to somehow setup NOS so that when it is off I have my current setup (without any sacrafices) and when I am ready to use it I just have to turn on a switch and without the fear of detonation I can use it? I also heard that the MSD system has some kind of a feature that will retard timing on demand maybe that is a solution? Anyone any experiences?

 

i guess you can try to run a dry kit alone but a pretty small shot (40-50) but i think you will still need some timing retard and more fuel..........you can get the MSD ignition box with timing retard and maybe a Apexi-VAFC to add more fuel in the upper RPM when your running the juice.

keep looking for more answers. i'm just trying to help.........

 

Hi,

I've considered this as well.

In the FI arena, Nitrous is probably the most high compression friendly variant.

To be safe, you would probably want to retard timing and run a little richer when spraying.

With my former setup, I had to manually adjust the plug gap, timing and fuel so that it was not optimal for a full N/A setup, but safer for N20. Is there a way to have two or more "profiles" for timing and fuel maps? If not, it seems like you would have to change the setup manually depending on whether you were going to the drag strip or a road course.

I had the NOS Plate kit (2040) which is essentially a direct port "wet" kit using spray bars in the intake manifold for N20 and fuel. The smallest jets provided with the kit gave a 75 HP shot. That's probably pushing it with an aggressive N/A setup. I wonder if you could get other jets to run a smaller shot. Otherwise, you have to look to the dry or fogger kits....

FB

 

Anyone else any opinions?

 

First of all compression is not a factor with N20 if you have the proper fuel tuning. Second N20 is not gonna work so well with JUN type-3's they have way too much overlap.

 

Whatup,

Yeah with FI, overlap is bad since you are already cramming lots of air/O2 in there. My (limited) understanding is that you can get blowby and the intake charge goes right through. You may want to focus on the exhaust cam to try and get better scavenging or whatever

Slowerthanu, I know what you mean about compression and Nitrous, but I think it DOES matter to some extent. When you spray, it raises the cylinder pressure, this is why it makes power. If you already have a lot of cylinder pressure from high compression, you are really pushing your luck with Nitrous. Nitrous is probably the most compatible with higher compression, but you probably wouldn't want to run a 100 shot with 12:1 compression. The fuel tuning can def help, but because of the increased pressure, you can still break something.

Thougths?

FB

 

alot of thing's raise cylinder pressure.
Let me correct myself with the proper fuel tuning and internal's compression is not a factor with N20. N20 also has a cooling effect so with the proper precautions I have seen people run a 70 shot on 11.0:1 comp. I believe a 70 shot would be fine on your car if a. you went back to stock cam's b. you dialed in your cam gear's for less overlap c. you went back to stock ignition curves or d. you run it as is except meager power gain's and the occasional broken ring land and burnt valve.

 

actually, when asked the same question a month ago on the FI board, they said that blowby by overlap wasn't an issue with nitrous because it isn't pressurising the cylinders like boost does. I'm just repeating what was told to me by the 'Gurus.' HTH, -C

 

I understand the concepts you are discussing, and thank you for your opinions. The only thing that is still puzzling me is if I do decide to run a small shot, lets say 50-60 shot, will the blow by cause such small power gains that it will be pointless? This is ofcourse running on my current setup, without any changes.

 

I am not sure of your current state of tune so I am not sure what your cam's are optomized for. JUN told me that the Type 2's are much better for N20 and that the Type-3's are 1 very hard to tune and 2 have too much overlap to be efficient with N20. I am not saying your cam's will cause the N20 to damage your motor but You do have a retuned ECU correct? The ECU as with most slap it on Tuned Honda ECU's on the market probablt has some pretty crazy ign. curves and a nice lean mixture up top to keep it all on the brink. With N20 you cant have a crazy ign. curve it just wont fly.