Curt

I was wondering if anyone out there is using a Nitrous system on their 928. If so, what system are you using and is your motor stock. Also, what year 928 do you have.

The reason I ask is because im debating on buying a NOS setup. The cost of the system im looking at is $469.00 without tax. This system if I decide I dont like it on the 928 can easily be adapted to work on a carburated chevy motor. Its a system supposedly for the 928 and has an adjustable spray rate from 75hp to 150hp. The dealer says that I wont have to modify the car much at all to hook this system up.

About my motor, its a 79 but has only 91,000 miles on it. Its in very good running condition. (no leaks, etc..)

I would appreciate any thoughts either positive or negative, however, I would like your thoughts to be based on facts not your unskilled opinions. Such as your gonna blow your motor dude..... If you have just reason to say that then I would love to hear your story.

Thanks for the input

Randy V

Curt, do you read the responses people provide to your queries?

See my response to your questions about the '9th' injector in the topic 'Hard Starting'...

Curt

Randy, I dont think that cold start valve has anything to do with this Nitrous post. In fact that post is so old its on the second page. I didnt realize some of you were refering to the cold start injector as the "ninth" injector. I do know where the cold start injector is, however, you did answer the question about the hole that is plugged. Thanks for that info.

Am I missing something here?

PorKen

Which system are you looking at?

I was kinda sorta looking at the Zex (no affiliation <a href="http://www.zex.com" target="_blank">Link: Zex Nitrous</a>), with it's nifty enrichment system (it modifies the fuel pressure regulator vacuum signal).

Curt

Thats one of the reasons why I posted this. I was looking at the NOS system which Holley recently bought and thats the system for $469.00. But I have looked at the ZEX website and cant figure out which would be better for the 928. That system looks like it will run closer to $600.00 I was hoping some of the Nitrous experts will input saying which system will be the best for our cars.

Chucker

Curt, I hope that you get lots of info on this thread. I want to put the same thing on my 82 928 and have lots of questions. So I hope that some experts chime in.

Chucker
1982 928 White

Normy

-Some of the car guys that I run with in Orlando have NOS on their camaros and Mustangs. They recommend a good quality system [you can burn a piston quick with this stuff...buy the best], and they say to get a progressive nitrous controller, which adds the gas over a second or two instead of instantly, reducing the sudden shock on the engine and transmission.

N!
'85 S2 5 Speed

Jim Nowak

NOS used to make a complete nitrious injection kit for 928s. The kit was $1,000 and included 8 different solenoids and nitrous injectors. There was even an article in Hot Rod magazine around 8 years ago.

Compucar makes a nitrous kit for the 928 and is $839.00: <a href="http://www.performancess.com/compucar.html" target="_blank">http://www.performancess.com/compucar.html</a>

Good luck!

Randy V

Yes, you are missing something Curt - namely that if someone provides assistance, the polite thing to do is acknowledge it with a follow-up post in that topic so they at least know that you've seen it.

Something Mom would have called 'Good Manners' <img src="graemlins/xyxwave.gif" border="0" alt="[bigbye]" /> .

Frank Castle

Curt,

I would stick with the NOS system. They have been doing it longer than all the other companies combined. I second the use of a progressive controller- in addition to reduced driveline shock, a progressive controller allows a more gradual increase in cylinder pressures which will reduce the engine stress. Is the system you are contemplating purchasing a dry system or a wet system?

Curt

Frank, not sure if its a wet or dry system. The NOS rep said that there is one nozzle that ties into an air inlet source before the throttle body. I will have to look at my car to see where that would be. The system sounds pretty complete and is a kit also used for the Mustang 5.0 boys so im sure its been pretty heavily tested. Im sure if I go NOS I cant go wrong.

Oh Randy, I dont know what I would do without your invaluable posts... Thank you...

morganabowen

Hey Curt,
Check with Keith Widom, from SOCAL928, he is in the process of installing one in his '82. He's pretty jazzed up about it.

Frank Castle

Curt,
A single nozzle system could be either wet or dry-but judging from the proposed location (ahead of the throttle body prior to plenum entry) my guess is that it is a dry system. That is really the only feasible system with that nozzle location. Injecting NOX/fuel ahead of the throttle body would result in fuel separation/puddling in the manifold and dissimilar air/fuel mixtures amongst engine cylinders- definitely not a good situation. You might call and speak to a NOS rep to make sure. By the way, that brings up an item I forgot in my previous post- you MUST install an air/fuel ratio meter to insure proper combustion mixture. The jetting that will come in the kit will be your starting point, but you will have to fine tune to ensure your system is just right for your vehicle.

Frank Castle

Curt,
I have a nice pic of a system schematic from NOS that I can send you. It is a wet system, but the only thing that would be different is your system would have only one solenoid. It includes some very important safety features that I would insist are in any nitrous sytem- namely a fuel pressure switch and throttle microswitch.
1) The fuel pressure switch ensures that your system can't be activated accidentally when the engine is not running (even more critical in a wet system). Otherwise, you can have fully atomized fuel/NOX mixture in you manifold that combusts when you start your engine. If you're lucky it will just be the biggest backfire you have ever seen/heard- if you're not so lucky your manifold will exit your hood just like one of those spectacular NHRA blower explosions.
2) Like turbos and superchargers, NOX is a power-adder that effectively increases an engines volumetric efficiency by increasing cylinder pressure. At low engine speeds, especially at idle, the increased cylinder pressure could result in bent connecting rods. Thus the throttle switch ensures that the system will only operate at wide open throttle when engine speeds are sufficiently high to handle the increased cylinder pressure. Additionally, since your car is a 5-speed, the system will de-activate when you ease off the throttle to engage the clutch (assuming you don't make full-throttle shifts)and resume operation when the clutch is released and the throttle once again fully open. Without this switch, the engine would rocket past redline when you engage the clutch.
There are some other items like window switches (activate/deactivate your system at the rpm's you designate) and progressive controllers that allow you to set up your system to make it virtually fool-proof and totally hands free on the part of the operator. Look throught the NOS and MSD online catalogs for just about all the equipment you will need. Sorry about the bandwidth!

Curt

Thanks for all the info Frank. Sounds like you know what your talking about. Yes the system im looking at is in fact a dry system. Sounds like the system comes with a lot of stuff.