That's the plan.....

 

Do you have any thing to tell you what your AFR is?

 

Good stuff Andrew. Keep those wheels straight when 'engaging'.

Hopefully you are going to dyno with A/F readings before too much messing around?

 

Not yet. I am planning on it though. Do you have any suggestions? Since Mark Kibort has used THIS system, I'm trusting (for now...) the fact that he didn't have any issues.

After I play a bit, I will probably do a session ont he dyno and map out the various "shots" to see how they look.

 

must be that your Plennum is lower than mine, as my set up straddled the oil breather hose. yours fits so the fuel line is right in the way!! very strange!

the nosile looks right and is pointing up as it goes into the engine.

the other thing, as you said, maybe the port is in slightly differnt spots for different year plenuums . Hmmmm

MK

 

What brand kit are you using, and what was the part number of the kit, Mark this might be a question for you.

 

Oh man, NOS on a 928! If that engine goes, it's gonna be expensive.... You're a brave man....

 

Well, I didn't get anything accomplished last night. I went to pick up the fitting from Ramchargers after work, and the damn thing was male-male! No one seems to have a 12MM 1.5 Female to AN4 male fitting. So I'm off to find a machine shop that can fab one up for me. Is there anyone here on the list that can help?

Oh I did find some wiring diagrams on how to hook eveything up, so last night wasn't a total loss. Now to the questions:

It's pretty much a Nitrous Xpress kit. When I get it all together and tested, I'll see about putting a shopping list together for others that might be interested.

Actually, I feel pretty safe about this for 3 reasons.
1. The supercharged engines are doing quite well with the added HP. That's primarily what I'm doing - adding HP but at a much lower level and for short periods of time.
2. Mine is a US Non-S 16 valver, non-interference engine - 220HP. I figure the weak link is probably the timing belt if anything. Remember I'm going with the 50 shot to begin with. At that point I'll be approaching the S engines. So as long as I don't lean it out I should be fine - that's why I'm going with the wet system.
3. Mark Kibort ran with it without incident (well I'm pretty sure without incident - How 'bout it Mark?) and so this is not the first aplication.

 

Also, it's *expensive* to replace an OB engine with another OB engine, but not nearly as expensive as replacing an s4 engine. There are POS OB's all over the place for sale. For parts, or fix-er-uppers, etc... It's a lot of labor, but not the end of the world, if you have to swap out a blown OB engine...

 

I rationalized it that way too. "Honey, I know I blew up the engine, but because it's not a GTS I 'Saved' us $5k!" Hopefully, I'll never have that conversation.

 

before you post this kind of message, you should do some homework. first of all, do you have any idea how NOS systems work? if so, you then understand there is no difference between adding a cam and more displacement and using NOS. more air more fuel = more hp. in fact, the NOS way is slightly better, due to the better atomization of the fuel air charge and the inherent cooling effect of the lower temp NOS charge. the propragation of the charge is better.

So, what would be the concern?? as long as you have the proper fuel air ratio,you are fine the nosiles assure this. the only way to burn pistons is to run at Stoich (ie 14.7) and get some detonation. if the NOS system went on without fuel, you would be so lean, the mixture would be 18:1 and you would just run rough and have low power, and actually CHTs would be quite low.

Mk

 

its not rocket science here. 50-75hp already proved by me with this sytem on my 4.7 and (5liter for a couple of times). on the 4.7, i ran a lot of bottles, sometime two bottles per weekend racing. when that engine came apart, there was no bearing wear (after 175,000miles too!!) and the pistons and valves looked perfect, as well as the cylinderwalls and all other components. (as do most well taken care of 928 engines)
on the dyno, fuel mixuture was set at 12.5, going down to 12.3 with NOS, and was consistant. my car went from 242 at the rear wheels to 290 hp and 315ftlbs of torque. its really not a risky thing. ive gone from 175 at the rear wheels with my stock 4.7US, to 243hp at the wheels with bolt on devices. more mass flow, equals more hp. if the engine can handle 420-485 at the wheels with stock type internals, i would have no issues with a 50 to 100hp adder to a 250hp base 928 engine at all.
so the question is, why would you , unless you are superstitious.

MK

 

by the way, i was using a fuel pressure regulator set at about 40-45psi (2.7-3.0 bar)on the 4.7L and about 52psi on the 5 liter. I think i may have also put in the 75hp shot with the 50hp shot NOS nosile to richen things up. (better check) if you are worried, you can do this. make sure your bottle pressure is heated to get the pressure to 1000psi or so, before you do a dyno run and check mixtures. if you have the proper fitting in the fuel and air nosile, im sure you will be ok. be nice to have a dyno to check things out at. you should be fine with the settings ive left the system at.

mk

 

I don't mean to scare, but I've seen some pretty nice engines go south when using NOS. As matter of fact, I know of five cars using NOS(family member owns a Mac Performance shop that works on mustangs). All five have had to have their engines replaced because something went wrong in the NOS set up.

 

pretty hard to screw up a 50hp shot. like i said, even if the fuel doesnt work, its tough to get a perfect stoich mixture to burn pistons. people fail to realize that real lean is not real HOT. its actually very cool on CHTs. you can pass through stoich with some car set up and that can do damage too. MOST of the damage from NOS systems is too much hp for the engine to handle . (ie blown head gaskets, broken rods, cranks, etc)
what was the failure of the 5 cars?????? what type of cars were they??

keep in mind, its not the hp that is hurting the engine. its running at Stoich (ie 14.7:1 fuel to air) with a 50shot, and a mixture that is set by the nosile and based on the pressure of the system, its very safe with a 928.

most of the folks using NOS are using 100-250hp shots and are doing it on engines not designed for big hp. keep in mind also that our engines on a 928 in stock form can handle 500hp. when they build a stroker motor, the rods pistons and crank, and of course cylinders and heads and gaskets are near stock in strength. most mustangs cant take their 5 liter 250 engines and make 350hp without some serious risk to everything! the 928 engine is pretty unique.

One of the reasons the s4 engines can survive at near stoich mixture in stock form, (ie most range from 13.5 to 14.5 and even leaner on the dyno) is because, from the engine's perspective, its like its running at half throttle even at full throttle stock.

so, for your mustang shops poor luck (or poor implementation) , i would ask:
1. did they tune them on a dyno (probalby no)
2. was the hp target increase large
3. did they fully understand what they were doing and have a good track record
4. If big hp was expected, were the engines build up to handle the increase hp.
5. would you have a shop that lost 5 engine to NOS, touch your car???

mk