Sleeper Nitrous Build

[RiceeatingSHO]

What have you done in preparation? Fuel pump, one range colder plugs, pulling octane adjustment bar...what else? I have rod bearings done and maintenance is good...

 

[Bizzy]

Any time you install a power-adder the main thing is maintenance, maintenance, maintenance.

For 100 shot of nitrous there is no need to upgrade the fuel pump. If your fuel pump is old and/or iffy, then you might consider getting a new stock pump. You also will want to make sure the fuel filter good to go. I used copper plugs instead of the stock platinum plugs. You will need to change them more often than the platinum style.

 

[RiceeatingSHO]

Maintenance is all done.

Now I'm getting mixed signals about the fuel pump though.

 

[luigisho]

http://www.ronmorrisperformance.com/miva/merchant.mvc?Screen=PROD&Store_Code=rmp&Product_Code=9102

http://www.byunspeed.com/product_info.php?products_id=468

If you look on the net long enough you will find not much consensus on how much hp each pump supports. Usually that's because it depends...155 or 190 should be fine if you want to replace your stock pump.

 

[1995SHO9]

You can get intake fuel pumps meant for fox body mustangs and they will fit. You can get them cheap then because everyone and there brother has a Mustang. I paid 130 for my 255 LPM fuel pump.

 

[SHOtime2511]

honestly id never run N2o on a stock pump,get at least a 155.

 

[Troywakeling]

I'd go with a 155, 190 is too much unless you have an adjustable FPR.

 

[RiceeatingSHO]

I'd go with a 155, 190 is too much unless you have an adjustable FPR.

The 89-90 models (like mine) can handle any pump (so I've been told)

 

[Brett]

If you dont trust the stock pump, get a 155lph, theyre like what, 90 bucks? probably one of the cheapest mods to these cars.

 

[Bizzy]

The 89-90 models (like mine) can handle any pump (so I've been told)

It's not just what you can shove in the tank that matters though. You have to remember about your fuel pressure regulators and the computer as well. Without Josh's FPR's even a 190 lph pump can be too much at load. You can go with a larger pump, however you will need to upgrade other parts if you do. Take a look at Josh's page for info on this. It's located here. Scroll down about mid way down, when you see "Want more tech info? Keep reading …" that's the part you might find interesting and helpful.

Here's a short quote from that page. It would benefit you to read the rest of it.

The stock regulator has no trouble drawing down the rail pressure to these low levels with a stock pump, but experience has shown that even a 190 lph pump (at full voltage) is too much for the stock regulator, never mind a 255 lph pump – in other words, the regulator, even when fully open, has enough of an internal restriction in the main metering passage that the rail pressure will not drop to the low levels demonstrated above, especially at high vacuum levels, if a 190 lph pump or higher is used, and the pump overpowers the regulator. This means that the relative fuel pressure is too high, and you are flowing too much fuel into the engine at low load. The EEC will compensate for this by trimming fuel, remember the compensation, and lean out the rest of your fuel tables by applying leaning long term fuel trims. This is not a good thing, as once you get closer to 0 vacuum, the fuel system will work properly, and you will be back to ‘normal’ pressures. However, if the system has been ‘learning lean’ with the excessive pressures, your close-to-0 vacuum fueling may be now too lean, like WOT, after the EEC applies what it has learned during higher vacuum levels.

Also, my "stock" fuel pump was a 155 lph pump that I bought from Murray's. My mistake in calling it "stock".

 

[93rev2sev]

Bizzy, when are you going to juice the ATX?

 

[yamahaSHO]

You can get intake fuel pumps meant for fox body mustangs and they will fit. You can get them cheap then because everyone and there brother has a Mustang. I paid 130 for my 255 LPM fuel pump.

That's moving some fuel right thurrr.

 

[Bizzy]

Bizzy, when are you going to juice the ATX?

My ATX is as stock as stock can be with the exception of the TB bypass and aluminum subframe bushings, and that's how I plan to keep it. I'm enjoying the car for what it is. Besides, it doesn't need any upgrades to make it more special to me.

 

[Sho Amo]

What have you done in preparation? Fuel pump, one range colder plugs, pulling octane adjustment bar...what else? I have rod bearings done and maintenance is good...

since no one has answered your question yet, i will.

fuel filter and hold on for dear life

 

[Dave904]

i'm doing fine with the 155 and my nitrous setup. one step colder plugs is always one of the first things i change when doing the nitrous thing. don't let the parts counter dude punk you out either. get your plug numbers and hand it to them. only accept what you requested. never explain a project or it's specific needs or purposes, to an autoland parts counter rep. props for doing all your service work. post some pics of your setup cuz.....

 

[RiceeatingSHO]

When it's done I will post some, we're gonna hide it nicely

 

[SHOtime2511]

It's not just what you can shove in the tank that matters though. You have to remember about your fuel pressure regulators and the computer as well. Without Josh's FPR's even a 190 lph pump can be too much at load. You can go with a larger pump, however you will need to upgrade other parts if you do. Take a look at Josh's page for info on this. It's located here. Scroll down about mid way down, when you see "Want more tech info? Keep reading …" that's the part you might find interesting and helpful.

Here's a short quote from that page. It would benefit you to read the rest of it.



Also, my "stock" fuel pump was a 155 lph pump that I bought from Murray's. My mistake in calling it "stock".

89 and 90 SHO's have a resistor that drops the voltage,thus allowing a larger pump without over pressurizing the FPR. RiceeatingSHO:as i mentioned in your other post a 190 will outflow the fuel lines themselfs.so unless you might have future plans of forced induction with huge boost there is no benefit.

 

[SASHO91]

I've been running my 80shot with the just a 190lph, modified 3.2 injectors, and 1 step colder plugs (3923 IIRC). Have not had any problems yet. I am planning on picking up a 42 main jet though... We'll see how that goes. But I also plan on running some 109 with that as well, considering the SHO is tuned now. I may even wire the octane adjust switch up too for extra insurance. Actually, I think the car may be on the rich side of things now, as I have 9% more fuel over what the nitrous adds.

 

[Speedy_91_SHO]

I didnt have a single problem spraying a 100hp shot on stock fuel pump. It doesnt matter what you do in preparation, things can always go wrong!(Im not in any way saying don't try and prepare). The best thing you can do is get a wideband, then you can watch the A/F and know if your going lean. Also, start out with small jets and work on up the scale.

 

[RiceeatingSHO]

Would a regular AFR guage work ok? I don't have plans of any other F/I... on this car...so I could just watch that, if it goes lean shut the N20 off, right?

Right now I'm feeling that a 155lph is just relatively cheap insurance.