Engine Anyone (still) running a single fogger nozzle or TB plate nitrous system?

skiwesser11

Active Member
Hey guys, I’ve kinda asked before but am getting into trying it more now.. I have an old TNW throttle body plate but no part number on it and the charts I can find that I’m 99% sure are for same plate seem way too lean to me so I’ve been asking around and was told to treat it like a single fogger “was what I gathered was meant” and with EFI and a 50N jet to run about a 19-23 split so I started with a 28F and am pulling 5* timing... with that combo and right at 900 #’s bottle pressure it kinda started “stumbling” (like 2 bad plug wires or something).. think it’s too rich? I’m gonna try higher bottle pressure next time it’s kinda cool..
Chart calls for 52N 25F for 125 shot but that scares me....
thanks for reading guys
 
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skiwesser11

Active Member
Anyone??

Tried today with a 44n and 22f pulling 3 degrees of timing and it was much smoother but still starting “skipping” or “stumbling” (not like a miss fire skip, don’t know exactly how to describe it) in 2nd gear at about 4000 but was still pulling unlike with the larger jets mentioned above, 3rd gear was smooth until about 5400ish and then was mildly doing whatever it’s doing... I feel like it may be too much timing retarded but haven’t shut off after a hit to look at plugs, not that I know how to “read” them anyway if that’s enough nitrous to even make a timing mark on strap??
 

skiwesser11

Active Member
Thank you.., I figured we’re few and far between doing what I’m doing.. this isn’t 1995 lol.. speaking of which, which is preferable between a TB plate and single fogger nozzle setup..... you guys like the nozzle mounted in intake tube before throttle body or in intake after TB?
 

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Anti_Hero0932

5 Year Member
Jan 29, 2012
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LaGrange, MO
i havent ran nitrous on a mustang yet but i have ran it on a camaro and a civic. i had the same thing happen alot of the time it could be due to your jetting. are you sure its correct?

mayke sure you have a chart for your plate or nozzle. i melted alot of plugs in my civic thinking i had the right jets but i didnt notice i was using a shark nozzle and not a pirhana nozzle. changed them and it was smooth as butter
 

skiwesser11

Active Member
I did that backwards...
7CEF5E7D-9E1B-462B-BDB8-497D4CDCF8E8.jpeg
There’s no part number stamped on plate anywhere but I’m 99% sure it’s part number 13005 as that’s the only plate from TNW “The Nitrous Works” (back then, I think no longer same name..?)
I have found 3 charts for part #13005 but seem like way too much spread, looks like would be lean and I’m afraid to go way lean lol

i havent ran nitrous on a mustang yet but i have ran it on a camaro and a civic. i had the same thing happen alot of the time it could be due to your jetting. are you sure its correct?

mayke sure you have a chart for your plate or nozzle. i melted alot of plugs in my civic thinking i had the right jets but i didnt notice i was using a shark nozzle and not a pirhana nozzle. changed them and it was smooth as butter
 

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Anti_Hero0932

5 Year Member
Jan 29, 2012
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LaGrange, MO
i would retard the timing and set the plate up just as they say. idk what size you are spraying but if its not bigger than a 75 its not a "big" deal.

if that doesnt work you may look into just doing a nozzle system from NX or something so you know the jetting is right.

also make sure you solenoids are working correctly. make sure they click on and off. sometime people will wire them all up and only one solenoid will be working. specially if its an old set up
 

skiwesser11

Active Member
I check solenoids to make sure they’re coming on frequently, it’s a 50n jet so should be 112ish on hp. It almost feels like an ignition issue, would too much timing retarded cause an issue such as that??
I realize I’m not using the jets on chart(s) but again they seem so lean compared to an online calculator... also as I mentioned already the 50n 28f starting point was recommended by guy who owns a speed shop (parts, nitrous etc) who’s also a mustang drag racer, owned store for 30 years and said he sold a lot of those plates back in the day and still suggested the yet again aforementioned 19-23 “split”... didn’t mention the chart and I didn’t have copy with me, store phone ringing non stop so here I am lol.. I plan to confer with him more when I get bottle topped off..
Thanks again guys... I’m hoping someone is/was using the same plate.. it has the same number of holes in bars as described in directions I found online but I cannot tell oriface size
 

skiwesser11

Active Member
i would retard the timing and set the plate up just as they say. idk what size you are spraying but if its not bigger than a 75 its not a "big" deal.

if that doesnt work you may look into just doing a nozzle system from NX or something so you know the jetting is right.

also make sure you solenoids are working correctly. make sure they click on and off. sometime people will wire them all up and only one solenoid will be working. specially if its an old set up
Do you think I should retard more than 5* or 3* with 44n 22f which is about 87hp according to calculator which actually calls for 25f and it did run better than larger combination.. so maybe it is THAT rich..? I’ll try retarding more timing but am afraid to retard more... no one here is recommending that.. im also afraid to lean it out too much either so I guess I need to face my fear(s)
 

Anti_Hero0932

5 Year Member
Jan 29, 2012
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LaGrange, MO
i would just run the recomended jets from the MFG. i had a guy tell me what jets to run in a car once and it ran like dog crap. i used used NX's webiste which seemd way different from what i was being told and it smoothed right up. the timing questions im not sure on. i would just search the forum or google it. the retarding the timing is a safety net so the more you retard the timing the safer you will be but the more doggy it will seem. like i said a 100 shot is nothing on these cars. set it up once like they said. pull a few degrees of timing and see what happens. you may want to pull a few plug now that you ran some different jets and see what they look like too
 

Gear grabber

Well-Known Member
May 23, 2016
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Wish I could help,my carb tunes 6.5 ffp (flowing fuel pressure) are pretty much 9-10 jet spread.
Current tune is 1st kit .049n-.039f pulling 3*
2nd kit .49n-.040f pulling another 3* (24* total on both kits,about 185hp) BP is off at 1025 on at 975
92 pump in the tank,C16 in the stand alone. AFR's are low 12's. NGK R5671A-9
 

skiwesser11

Active Member
Wish I could help,my carb tunes 6.5 ffp (flowing fuel pressure) are pretty much 9-10 jet spread.
Current tune is 1st kit .049n-.039f pulling 3*
2nd kit .49n-.040f pulling another 3* (24* total on both kits,about 185hp) BP is off at 1025 on at 975
92 pump in the tank,C16 in the stand alone. AFR's are low 12's. NGK R5671A-9
Guy also told me on carbs it’s usually a 8-10 spread or something like that so must be close to correct on EFI, I trust he knows what he’s talking about anyway.. you should be at same “HP” level as EFI with same jet right?
About 109 with 49n on 1st??
Thanks!
 

skiwesser11

Active Member
Guy also told me on carbs it’s usually a 8-10 spread or something like that so must be close to correct on EFI, I trust he knows what he’s talking about anyway.. you should be at same “HP” level as EFI with same jet right?
About 109 with 49n on 1st??
Thanks!
Now that I read better you’re saying about 185 worth with both kits on? That would be a little lower per hit than I figured... seems N jet would dictate “hit” be the same whether FI or Carb so long as fuel is at same ratio to nitrous, am I thinking about it wrong? Probably am.
Why are you running a fuel jet one size smaller on 2nd kit? Is there a lot of difference in just moving one size for F on carb because such lower fuel pressure?
-9 is a really cold plug right? I’m starting with a -7 but don’t plan to go bigger than a .054n which is 130ish I believe..
Thanks again guys!!
 

Gear grabber

Well-Known Member
May 23, 2016
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You are correct ,if fueled equally x jet will make the same power carb. or efi.
I am going by power to the rear wheels .049n jet is about 92 H.P. to the wheels.
I assume the 109 in the calc.is flywheel H.P.

Yes -9 is a cold plug,i have been using it for about the last 3 months on the street. As long as your fueling
is clean, it is not a problem. It is the suggested plug in the chart.

My fuel jet is 1 size larger on the second kit. That tune puts my AFR's in the12.2 range with both kits on.
 

Gear grabber

Well-Known Member
May 23, 2016
262
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Rereading your first post that sounds like detonation (bad)
The jet spread is determined by fuel pressure. If foxbody is supposed to have X pressure (say 40) but you only have 25,
your nitrous tune is going to be very lean. And if you have 60,your tune will be rich. Do you know what your fuel pressure is ?
Are you sure the fuel enrichment is working ? And said enrichment is getting through the plate into the intake ?
 

skiwesser11

Active Member
Rereading your first post that sounds like detonation (bad)
The jet spread is determined by fuel pressure. If foxbody is supposed to have X pressure (say 40) but you only have 25,
your nitrous tune is going to be very lean. And if you have 60,your tune will be rich. Do you know what your fuel pressure is ?
Are you sure the fuel enrichment is working ? And said enrichment is getting through the plate into the intake ?
Yes I agree with all the above.. my fuel pressure is set at 43psi (adj regulator and gauge under hood) I have checked that plate is cleared... well I did upon installation.. I can definitely tell fuel is getting to plate and I have plenty enough flowing to it I’m sure .. also I did not mean to describe problem as detonation.. I’m 99% sure it’s too rich if anything.. it’s “stumbling” feels almost like bad plug wire(s)