Does added compression affect the suggested fuel jet size?

Reply Subscribe

Thread Tools

Search this Thread

Oct 6, 2014 | 04:48 PM

poltergeist 02

Thread Starter

TECH Fanatic

iTrader: (65)

Joined: Jan 2010

Posts: 1,402

Likes: 3

Does added compression affect the suggested fuel jet size?

I know there are suggested starting points when it comes to nitrous/fuel jetting, but does added compression affect the suggested (starting point) fuel jet?

Oct 6, 2014 | 06:49 PM

HCI2000SS

TECH Senior Member

iTrader: (2)

Joined: Aug 2012

Posts: 11,137

Likes: 20

From: Howell & Fenton MI

I'm pretty sure not enough to alter it. I'm 11.5 compression and run a 52/28 for my NX 100 shot, which is standard

Oct 6, 2014 | 08:01 PM

poltergeist 02

Thread Starter

TECH Fanatic

iTrader: (65)

Joined: Jan 2010

Posts: 1,402

Likes: 3

cool, thanks. I'm new to nitrous and just want to be sure before I go and screw something up with a stupid mistake.

Last edited by poltergeist 02; Oct 6, 2014 at 10:59 PM. Reason: spelling

Oct 6, 2014 | 09:22 PM

Dynospeed

Launching!

iTrader: (3)

Joined: Aug 2011

Posts: 283

Likes: 2

Just pull a little extra timing and you will be fine.

Oct 7, 2014 | 08:23 AM

NitrousExpress

Ls1tech & Truck Sponsor

iTrader: (4)

Joined: Jun 2010

Posts: 2,267

Likes: 1

From: Wichita falls Texas

Quote:

Originally Posted by Dynospeed

Just pull a little extra timing and you will be fine.

This. Race fuel helps with the timing, as you already probably know. Higher compression doesn't affect the fuel jet size, but more timing will have to be pulled.

-Garrett

Oct 7, 2014 | 09:11 AM

poltergeist 02

Thread Starter

TECH Fanatic

iTrader: (65)

Joined: Jan 2010

Posts: 1,402

Likes: 3

I was planning on pulling 4* for a 100-125 shot. Should I pull 5* for the added compression?

Oct 7, 2014 | 09:40 AM

HCI2000SS

TECH Senior Member

iTrader: (2)

Joined: Aug 2012

Posts: 11,137

Likes: 20

From: Howell & Fenton MI

For reference, with my compression I ended up pulling 3 degrees for a 100 shot

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Verdad Gallardo

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Verdad Gallardo

10 Camaros You Should Never Buy

10 LS Engine Myths That Refuse to Die

Verdad Gallardo

Oct 7, 2014 | 10:15 AM

poltergeist 02

Thread Starter

TECH Fanatic

iTrader: (65)

Joined: Jan 2010

Posts: 1,402

Likes: 3

It's only 11.5:1

Oct 7, 2014 | 10:35 AM

#10

poltergeist 02

Thread Starter

TECH Fanatic

iTrader: (65)

Joined: Jan 2010

Posts: 1,402

Likes: 3

I'm also running a window switch. I'm running a larger converter that was designed for a max effort n/a setup. Do you think I should set the switch to cut out @ 6700?

Oct 7, 2014 | 10:49 AM

#11

NitrousExpress

Ls1tech & Truck Sponsor

iTrader: (4)

Joined: Jun 2010

Posts: 2,267

Likes: 1

From: Wichita falls Texas

Quote:

Originally Posted by poltergeist 02

I'm also running a window switch. I'm running a larger converter that was designed for a max effort n/a setup. Do you think I should set the switch to cut out @ 6700?

I would set it to cut out about 200 rpm's before the rev limiter. At 11.5:1 I would just pull 3-4*per 100hp and go from there.

-Garrett

Oct 7, 2014 | 11:04 AM

#12

poltergeist 02

Thread Starter

TECH Fanatic

iTrader: (65)

Joined: Jan 2010

Posts: 1,402

Likes: 3

So you think I should spray through the shifts? The current tune is for n/a, I wasn't shure if it would bounce the rev limiter if I were to spray through the shifts.

Oct 7, 2014 | 11:08 AM

#13

HCI2000SS

TECH Senior Member

iTrader: (2)

Joined: Aug 2012

Posts: 11,137

Likes: 20

From: Howell & Fenton MI

My a/f was 11.8 with 3 degrees pulled for the 100 shot, and the pills were 52/28. You'll be fine at 3-4 degrees

Oct 7, 2014 | 11:20 AM

#14

NitrousExpress

Ls1tech & Truck Sponsor

iTrader: (4)

Joined: Jun 2010

Posts: 2,267

Likes: 1

From: Wichita falls Texas

Quote:

Originally Posted by poltergeist 02

So you think I should spray through the shifts? The current tune is for n/a, I wasn't shure if it would bounce the rev limiter if I were to spray through the shifts.

That's where a window switch comes in handy. I would use the MSD 8969 on your application if you decide to go with one. Otherwise, you don't want nitrous spraying off the limiter. No bueno. Haha.

-Garrett

Oct 7, 2014 | 11:29 AM

#15

inssanity21

TECH Apprentice

iTrader: (16)

Joined: Nov 2008

Posts: 302

Likes: 0

From: illinois

I only needed 4 degrees pulled for my 150 at 10.5 cr. I have nothing pulling the timing and didn't lose anything noticeable from being down the 4 degrees. If you want some help installing let me know, I would be more than happy to help.