Hi all,

As you can see by my Signature i have a 87 Z28 IROC-Z. 5.0 Auto TPI.

It has a Wet Nitrous Kit which is activated by a throttle switch that only opens at WOT.

I found out today that my car has the ( 150 shot ) nozzles installed. The last owner gave me a pack of Fuel & NO Nozzles and a calibration chart. After checking the sizes of the nozzles installed it was 150HP.

Now my thinking is, "This will kill my engine". I personally have not even had the ***** to use it yet. As i have only been drving the car for a week.

My engine has 68,000 miles, and the car is in Perfect condition. Oil pressure is 35psi Idle, 50psi 2000 rpm.

Q. So is 150 Shot ok ???, or should i back it down to something sensisble and reliable such as 80hp nozzles ???

Many thanks for any help in advance.

 

I would stick with a 100 shot and make sure you have a good fuel pump (I went with a holley blue) and a good ignition MSD 6A or up...
Just my .02

 

Are you running a carb pickup with that holley blue pump? Or are you pulling through the stock pump?

I am going to get one of the holley blues before I get my edelbrock nitrous kit. I am also getting a MSD 6al box so I will have a rev limiter.

I would stay around 100. A 150 shot on a stock 305 is a bit ballsy for me.

 

actually I have a 84 so it is a carb pick up anyway I guess? it had a factory mechanical pump so I just spliced the pump into the main fuel line right off the tank. then I capped the return line off the mechanical pump and used a block off plate on the motor... the blue pumps are pretty loud so you might want to think about a good way to insulate it better too BTW. mine is driving me crazy right now. lol
maybe dynomat?

 

A buddy of mine has a 1984 car I could get the pickup out of....

But thats taking the tank out of 2 camaros. I don't think that would be worth the trouble. Besides I'm sure that pump is good enough to pull through the stocker.

Can you hear it loudly over the exhaust? If so it must be pretty loud.

 

yeah I think you will be able to pull through the pump just fine. I can hear it mainly inside the car not outside. just try to insulate the way you mount it as best as possible. they give you a rubber gasket but it isn't enough IMO.

I'll let you know if I come up with a easy solution here in the next week or so...

 

Alright man thanks.

You think this pump is plenty to support a 100hp hit of nitrous on a mild small block?

 

yes, the holley blue is adaquate for a healthy SBC and a 50-150 shot.

just remember if you want your motor to live - timing and fuel. these cannot be stressed enough. at ANY sign of detonation shut down and back off timing. obviously run the higest grade gas you can, prolly 93...

good luck.

 

A holley blue cant supply much more than the fuel used to make 300 hp. A holley blue can supply a stout little motor OR a nitrous shot but not both.

 

How do you figure? I dis-agree. I have seen friends that have dynoed over 400 rwhp with good A/F reading with a holley blue pump...

 

I have seen cars on our dynojet that couldnt. I personally polished the TRW pistons in the old JYD with a 3310 and a 100 hp super power shot when it ran out of gas litterally emptied the bowls at the track. I know this because when it happened I shut it off and we pushed it to the pits to physically check.
Gary Rohe of EZ-street fame, was asked to write a small article a few years back for all of the guys that have regular small nitrous kits. Remember this is the guy that runs like7.99 on a small block and single two jet plate system. He personally sited the holley blue pump as the worst thing that happened to guys with nitrous. He reiterated that it makes a fine dedicated pump for the smallest nitrous systems, but not to run the engine and the nitrous at the same time on it. That sounds basically like what I saw. Before you get all excited, I too have seen a "few" cars that have gotten away with it. They are the exception not the rule, why press your luck. You will find guys running N/A that can't get enough fuel out of them.

 

Sounds good. Good information thanks for sharing. I'll have to think about upgrading to a black series pump then when I put the 383 in...

 

I say get a black for the motor and a blue for the nitrous and install a second pickup.

 

thats exactly what I was thinking! thanks