Nitro Don

Is anyone running 175hp or 200hp jets in the NOS TPI 5151 system? I installed and ran nitrous jet 82 and fuel jet 65 after someone told me it was for 175HP shot.
I just want to confirm this is accurate.
Also would like to know the fuel and nitrous jets needed to run a 200hp shot.
How much can the selenoids handle before I need to step up to larger ones?
Thanks alot,
Don

[This message has been edited by Nitro Don (edited March 07, 2001).]

87formula383

Those jets look like 200hp to me...im running about 175hp in mine but hade to recalibrate the jets when i went from 350 to a 383..comp. changed from 9:1 to 11.25:1....my jets are 56 for NO2 - 61 fuel..I know the numbers sound ****ed up but they work good in a 383...with TPI..your jet no.s are really high,is that a nitros works kit? nitros express?...the numbers differ slightly depending on company.

The ODB

the truth with NOS stuff is,
if you want to go over 150hp then you need to go to the large solenoids that come on their cheater kits. Above 200hp and you go to pro-shot solenoids and #6an lines.
otherwise the nitrous flow will not keep up with your fuel delivery and jetting up to higher horsepower will give very little or no results.
The NOS jetting recommendations are already very rich in the first place.
With a small 10-lb bottle you cannot depend on pressure to give you a steady flow of nitrous, because the pressure drop is so severe. The bigger lines, solenoids, and jets you use the bigger the pressure drop. One solution is to run a larger 20-lb bottle or two 10-lb bottles T'd together.

ODB

Nitro Don

ODB,
Your right,I didnt notice any change from the 150 jets to the 82/65 jets.I can say that I could "smell' the nitrous way after the run.Never really did before.Yes it felt like it had a overly rich "bog" feel to it.
I think Ill try the bigger selenoinds.Are the bigger selenoids going to screw with the accuracy of the 150 jets,since they are based on the smaller selenoids?
Thanks,
Don

Another qustion I just thought of:
Would I need to replace both nitrous and fuel selenoids together or can I just change the nitrous selenoid?I dont think I would be jetting the fuel any higher than the current 65,maybe 70 tops.

[This message has been edited by Nitro Don (edited March 07, 2001).]

87Z-ya

iTrader: (1)

I run 73n2o, 53fuel at 50psi for what is supposed to be a 150 shot. I still feel surge with this and believe I need bigger solenoids. Bottle is full and pressure is right.

------------------
87z 383,afr 190's, comp hyd roller(242/248-.540/.562,114 sep),Ported and polished mini ram, 30lb inj, 3.42 gears, tremec 5spd, , 1,3/4" slp headers, speed pro bank to bank-wb02.
"Just remember children, no man can beat you once youv'e found the cliterous." 'chef'

The ODB

no the jetting size is based on pressure, not the solenoid size. You don't have to worry about the jets.


anything over 200hp and I would upgrade the fuel solenoid too just to be safe. Other than that the fuel solenoid should be fine.

when you start running more powerful N2O systems it is better to stage with multiple systems rather than run one large system.
IMO.

The ODB

surge could be several things.
too rich
too lean
ignition misfiring

if it's too lean it would be ok in low gear and be worse in high gear, and you should be seeing damage to your sparkplugs or pistons.

if it's too rich then it would be worse in low gear and not as bad in high gear (assuming you wait til high gear to activate the system).

If it's the ignition, you may not have a strong enough ignition for that power level. You want to run low resistance wires & plugs with a very tight gap of .033" or less. An MSD will help greatly.

87Z-ya

iTrader: (1)

Good stab at it odb. I have msd. On the dyno with a wbo2 in it(before i got my speed pro). It would get a a/f ratio of about 11-1,pretty rich, but not to bad for running juice. It would start to surge on the big end of the pull. With it not being lean and bottle pressure good it tends to lead that flow was not sufficient. This is what the a/f readings showed also, as it would start to surge the a/f would bounce to around 10.6-1. Appreciate the advice though.

------------------
87z 383,afr 190's, comp hyd roller(242/248-.540/.562,114 sep),Ported and polished mini ram, 30lb inj, 3.42 gears, tremec 5spd, , 1,3/4" slp headers, speed pro bank to bank-wb02.
"Just remember children, no man can beat you once youv'e found the cliterous." 'chef'

Beast5spdGTA

I have a stock 305 TPI '89, about 90,000 miles, used NOS kit, it's pretty old, the jets i have are 46, .038 and .028, I plan on running the .038 for N20 and .028 for fuel, this is more rich than in the instructions for a 110hp, but will it be too rich. Don't want to spend the money for a new jet set. suggestions?

The ODB

the jet in the instructions is already too rich, so yes.
don't want to buy another nitrous jet? are you kidding?

Nitro Don

I did a little searching around.I coudnt get any emails from NOS/Holley support
But I think that the biggest jet that can be used in a powershot selenoid is a 72,and running a 72nitrous and 52 fuel will give me about 170hp shot.
The 5151 kit uses a 70 nitrous and 52 fuel.
Nitro Don

David 91RS/Z28

If I'm not mistaken the NOS powershot solenoids are only cabable of flowing enough for a 175hp shot. You will have to step up to a larger solenoid if you want more!



------------------
David Tuschhoff
1991 RS Camaro M5
A SuperRammed, TPIS,
Ross, AFR, Scat, Crane,
CompCams induced 355!
My f-body page!