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  • SN95 4.6L Mustang Tech

NITROUS QUESTION

  • Thread starter Thread starter green97
  • Start date Start date Dec 15, 2008
G

green97

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Dec 13, 2008
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Dec 15, 2008
#1
  • Dec 15, 2008
  • #1
How big of a shot can i run on a 4.6 with stock internals?
 
G

GettinThere

Member
Jul 29, 2005
553
1
19
Central Texas
Dec 16, 2008
#2
  • Dec 16, 2008
  • #2
Generally:
100 - no problem,
125 - relatively safe limit,
150 - on the edge.
 

96SCstang

New Member
Jul 22, 2006
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novi, MI
Dec 16, 2008
#3
  • Dec 16, 2008
  • #3
GettinThere said:
Generally:
100 - no problem,
125 - relatively safe limit,
150 - on the edge.
Click to expand...

This is pretty much the guideline to follow, but i will add that with the proper tune and safety features, (i.e. window switch, bottle warmer, etc.) you can do a 150 shot without many issues. but as with all power adders expect the unexpected.
 

SADL-UP

Member
Jun 19, 2005
42
1
8
Massachusetts
Dec 16, 2008
#4
  • Dec 16, 2008
  • #4
GettinThere said:
Generally:
100 - no problem,
125 - relatively safe limit,
150 - on the edge.
Click to expand...

This is probably fine provided that you have all of the supporting mods to support the nitrous kit such as RPM window switch, Fuel pressure safety switch, 1-2 steps colder copper plugs, premium fuel, and MOST importantly a good dyno tune.

What type of kit are you running?
 
G

GettinThere

Member
Jul 29, 2005
553
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Central Texas
Dec 16, 2008
#5
  • Dec 16, 2008
  • #5
SADL-UP said:
This is probably fine provided that you have all of the supporting mods to support the nitrous kit such as RPM window switch, Fuel pressure safety switch, 1-2 steps colder copper plugs, premium fuel, and MOST importantly a good dyno tune.

What type of kit are you running?
Click to expand...

Harris Speed Works :: EFI Nitrous Kits :: Ford Vehicles :: HSW Wet Nitrous Kits :: Sudden Impact Series :: HSW Sudden Impact Single Nozzle Wet Nitrous Kit (MODULAR MOTOR)

I think the only accessory that might be considered necessary (from a safety point of view) is a window switch. For a 100 (and possibly a 125) shot, a tune is not necessary, but is still desireable. I run one step colder plugs gapped down to .042, a full tank of 93 octane, and timing backed down 2 degrees (with my ancient, old-school timing adjuster). Also, I don't power-shift, just quick-shift.
 

Slow35th

New Member
Dec 14, 2008
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Dec 16, 2008
#6
  • Dec 16, 2008
  • #6
a stock 2v bottom end can handle 420rwhp and still be safe. after that you really start pushing the limits of the rods and hyperutectic pistons.
 

04GTMustang

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Feb 28, 2006
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Stafford
Dec 16, 2008
#7
  • Dec 16, 2008
  • #7
you can do a 150 and still be safe just make sure you have 2 step colder plugs gapped properly and also pull about 5 degrees of timing out. i ran mine to a 200 shot a few times and it ran fine. pulled very hard though hahaha but i dont advise doing that i was just seeing if she could take it a few times.

100 shot though you wont have any problems. with a good wet kit tuning isnt even required. just make sure you are on the stock mustang tune.
 
G

green97

New Member
Dec 13, 2008
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Dec 16, 2008
#8
  • Dec 16, 2008
  • #8
04GTMustang said:
you can do a 150 and still be safe just make sure you have 2 step colder plugs gapped properly and also pull about 5 degrees of timing out. i ran mine to a 200 shot a few times and it ran fine. pulled very hard though hahaha but i dont advise doing that i was just seeing if she could take it a few times.

100 shot though you wont have any problems. with a good wet kit tuning isnt even required. just make sure you are on the stock mustang tune.
Click to expand...

well i was planning on getting a custom tune this spring just on motor. and i was just going to spray on top of that. are you saying thats bad?
 

BurningRubber

10 Year Member
Dec 6, 2004
1,865
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Dec 16, 2008
#9
  • Dec 16, 2008
  • #9
green97 said:
well i was planning on getting a custom tune this spring just on motor. and i was just going to spray on top of that. are you saying thats bad?
Click to expand...

Yes. Generally for an all motor tune your timing will be increased (advanced). You CANNOT do that if you are going to run nitrous unless you want to destroy your engine.

2* less than stock timing for a 100 shot and your golden, to be on the safer side. You can run on a stock tune/stock timing depending on the kit.
 

twogts4us

15 Year Member
Apr 1, 2004
4,188
12
79
Dunedin, FL
Dec 16, 2008
#10
  • Dec 16, 2008
  • #10
I ran the NOS Noszle kit (direct port) with a 125 shot without issue and without a tune. NOS recommends sticking with the stock tune, although pulling some timing is a safe guard. Your biggest concern (save for backfire) is detonation. hence the pulling of timing. Detonation is bad enough when you're NA, but imagine how those poor pistons and rods would feel getting slammed with NOS.
As stated in the other posts, be sure you have the precautions in place (window switch, FP switch, etc).
 

the98stang

Active Member
Aug 12, 2005
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47
Clovis, CA
Dec 17, 2008
#11
  • Dec 17, 2008
  • #11
hrmm...we will see what my engine does after a 50 shot on top of the 13lbs of boost

But yes, most people stick with 100-125 to be safe
 

04GTMustang

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Feb 28, 2006
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Dec 18, 2008
#12
  • Dec 18, 2008
  • #12
BurningRubber said:
Yes. Generally for an all motor tune your timing will be increased (advanced). You CANNOT do that if you are going to run nitrous unless you want to destroy your engine.

2* less than stock timing for a 100 shot and your golden, to be on the safer side. You can run on a stock tune/stock timing depending on the kit.
Click to expand...

exactly NX says on a 100 shot no tuning is required as long as its the stock tune. the stock tune on these mustangs are pretty rich so if you are running that then you should be fine.
 

04GTMustang

New Member
Feb 28, 2006
348
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Dec 18, 2008
#13
  • Dec 18, 2008
  • #13
the98stang said:
hrmm...we will see what my engine does after a 50 shot on top of the 13lbs of boost

But yes, most people stick with 100-125 to be safe
Click to expand...

hahahahaha if you do it ill do it

im going to push my motor as well and see what happens cause when it blows a mmr 900 is going in with a 200 shot on 14psi hahaha.

but im not trying to blow it up i just wanna see how far it can be pushed before it lets go.
 
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