[565CamaroSS]

I seen lots of discussion on here about jet spread and it seems clear that most are running at least 6-8 sizes smaller on the fuel jet. I have the Performer RPM plate which recommends square jetting (71/71 for 150HP) and 5.5psi fuel pressure.
My Regulator (Aeromotive) can only go as low as 6psi, so I am worried that it will be too rich.
I am going to run one heat range colder plugs and retard the timing 5 degrees, and will run C16.
What do you guys think is a good start for jetting?

 

[nos67ss]

10 jet spread @ 5psi would be a good start probably

 

[mustang conv]

I have run 73n 950lbs 60f at 6lbs. pullin out 10 degrees that worked for me

 

[565CamaroSS]

Thanks. It sounds like I need to start at about a 61 fuel jet (w/ the 71N) then..

 

[cyipher]

10-14 spread is common at 5-6 lbs

 

[Mike W.]

I use to have one of those plates and it worked really good. I would start with a 65 or so and check your plugs after a pass. Go down if you need to. Better safe than sorry. What comp. you runnin'.

 

[fastbill73]

running 51 jets square and 6psi plugs are mint pulled 2 degrees

 

[1fast10]

68f,78n made over 200rwhp for us.

 

[showtime603]

I'm curious about this too..I've got the rpm II and it has the same factory jetting. I haven't sprayed much so I was afraid to mess with them. I'm curious what steve has to say about this. I haven't made a full pass yet on the kit so I'm not sure how the square jets will do. I do run the recessed tip plugs for sure. I will say a friend of mine has the same kit, jetted it for a 200hp hit and made like 198hp extra on the dyno, so I figure its kinda close.

 

[565CamaroSS]

Thanks guys. It has 15:1 comp. I will probably will start at 65 and work down from there.
I wish now that I had just bought a Real Street plate from IS, though. From what I've read on here that sounds like the best single bar plate out there.

 

[Induction-Solutions]

Thanks guys. It has 15:1 comp. I will probably will start at 65 and work down from there.
I wish now that I had just bought a Real Street plate from IS, though. From what I've read on here that sounds like the best single bar plate out there.

It's never to late !! The RPM plate isn't bad and will flow what we look at as a real 275-300 if set up properly. The Real Street plate will go to around 400..

As far as the jetting goes we commonly use spreads anywhere from say about 10-20+ numbers depending on the combo as well as the overall flow of the particular system...

Feel free to give a call if you would like to talk over your options.. Thanks, SJ

 

[565CamaroSS]

Thanks Steve. I only want to spray around a 100-150 shot or so, which is why I thought I would be fine with the RPM plate. I didn't know until recently that you used to work for Edelbrock, so I feel better about my little cheap kit now! But, still, I would've really have preferred to have some of of those little Superman decals under the hood!!! I will definitely give you a call when I want to upgrade. Thanks again.

 

[cyipher]

It's never to late !! The RPM plate isn't bad and will flow what we look at as a real 275-300 if set up properly. The Real Street plate will go to around 400..

As far as the jetting goes we commonly use spreads anywhere from say about 10-20+ numbers depending on the combo as well as the overall flow of the particular system...

Feel free to give a call if you would like to talk over your options.. Thanks, SJ

Steve what makes your system different then the edelbrock one?

 

[565CamaroSS]

I think Steve's RS Plate spray bars have a lot more holes - two nitrous for every fuel, and the bars are Stainless steel, I believe. And, of course, it comes with Steve's tuning expertise!

 

[offroadr]

Found this on a search, so a 150hp recommendation from Edelbrock is 71n/71f and you guys are recommending 71n/61f 5.5psi? Just making sure I read this right.

 

[Qwiktripz1320]

The factory settings are "safe". The old NOS brand settings were spread up to ten sizes bigger on the fuel. CYA I guess. I have found best results on that plate with 102N 93F @6.5
pullin 7 degrees. It's the "KFC" tune-up- Xtra crispy!{quote:Big Chief} Nitrous Rules:supz:

 

[offroadr]

The factory settings are "safe". The old NOS brand settings were spread up to ten sizes bigger on the fuel. CYA I guess. I have found best results on that plate with 102N 93F @6.5
pullin 7 degrees. It's the "KFC" tune-up- Xtra crispy!{quote:Big Chief} Nitrous Rules:supz:

Thats not a 150 setup though?

 

[Qwiktripz1320]

Thats not a 150 setup though?

O yea. I forgot he only wanted to spray 150. Sorry I got a little excited. You're right, the 71N 71F would be a nice safe 150HP, and 71F 61F would be a little stronger and crisper. Newb mistake:smt021

 

[Induction-Solutions]

I'm not at the shop to look at any closer numbers but a .071 N wouldn't be a bad starting point and then going with a 8-10 smaller fuel jets fine as a starting point with those plates.. thanks, SJ

 

[565CamaroSS]

I'm currently running a ten jet spread (67N/57F) @6psi FP with 25 degrees total timing and it could still go leaner. The motor likes that tune, but the tires don't, LOL!