928SS

fwiw, GA planes I've flown/seen w/FI were all turbocharged/not supercharged... but it's a minor point as there were a few supercharged war birds back in the day.

I"ve been fiddling w/this for a month now myself.... wet single nozzle kits are < $550, and seem to go up to about 150hp... http://store.summitracing.com/egnsea...6&autoview=sku I've got forged pistons and a monster bottom end, so I'm not too worried about overstressing anything but my fuel/NOS budget...

imo, dealing w/the friggin bottle is the bugger. it's gotta be well hidden on a street car in CA or the 1st impromptu inspection will result in bye bye shark/off to the impound. looks like I'll have to lose the rear seats and do a custom set of bottom/seat well covers, move some stereo stuff, bla, bla.... a pita, but when done will be pretty slick/clean...

keep us posted!!

FlyingDog

Rob, I don't know how safe it'd be, but you might be able to hide the bottle in one of the fenders behind the stock plastic panel. That would also make the hoses much easier to conceal.

928SS

was eyeing that spot the other day when it was up on a lift.... does seem to be some room there, probably rather have a bottle explode outside rather than in, but a leak inside would be more fun

not too sure how easy filling the bottle would be though maybe a fitting up front under the hood next to the AC condenser? then all I'd need is a fill station w/a long N0s hose, or a big doorway

the advantage to putting it in one of the rear seat bottoms is that it gets warm there from the exhaust, so I wouldn't need a bottle warmer/easy access for refills. there was a nice big space in the rear tire well too, till I stuffed a sub woofer there... I've been haggling w/the stereo guy about moving it, but he's whining.... we'll figure something out soon, but hooking up/hiding a single nozzle under the manifold/ next to the TBody looks pretty easy as is switch mounting, etc...

other concern is maintaining enough fuel pressure for WOT and the fogger system at the same time.... currently running 59lbs w/#24 injectors, but I'm not sure how much volume that old stock pump can do... iirc, theres a high flow bosch unit that'll fit where the stock unit goes, so it might be time for an upgrade... rather not do a seperate pump, for the sake of cleanliness

last concern is that most kits are for 5.8L max... I"ve got 6.5L, but I think worst case it'll just result in a few less ponies than advertised - probably not a big deal w/150hp kit as long as the AF is sane...

Ed MD

NOS systems are the Bomb...you can call them for advice, use a wet system, single stage can go up to 150 easy, hook up the relays to ignition power source then your not dumping nitrous into the manifold when its not running. Most nitrous catatrophes are caused with a nitrous dump nto the intakes prior to ignition causing an explosion... Ran lots of nitrous in a previous life..., had a 944 with it...embarressed a lot of 951s. Do your clutch before installing the system. In a spider you could run individual foggers, it would look the bomb, otherwise you could do a 2 stage system. get electric fans, wire them to turn on when you arm the system..I'm considering nitorus on the 85S3 with the organ pipes.. but will have DR's system on the S4...Good luck.. nitrous is great because a stealth system done "right" really is a great sleeper for an extracurricular events that may involve a gentltman's wager!!!!!!!!! Ed M

mark kibort

NOS dump will not do anything but make things go WAY way lean. any "explosion" needs a proper fuel air mixture. actually, the Nitrogen in NOS is not only cold, but cusions the flame front. (as opposed to an equal mass flow of one due to turbo/supercharging or blowers.)

what causes burned pistons or burned valves, broken rings, etc. (common failures) is TOO much NOS and fuel for the engines mechanical limits. or a chance you have the mixture wrong at stoich.

my system worked perfect. proven by taking the engine apart after a year or two of using it. went through a lot of bottles. valves were brown and clean, pistons had the normal amount of carbon build up for a race car, no ill effects.
compression never varied. the reason the engine came out was for a blown head gasket, that was sealed by Barr's stop leak. Then, the 5 liter went in, and used NOS on it as well.

50hp to 100hp is no problem for a single fogger, piped into the plenum at some point before the spiders. otherwise, you need to do the 8 foggers.

No problem with fuel pressure to support an extra 50-100hp even with 59psi. I had 53psi and was running the 75hp shot with no issues. (however, only 285rwhp though)

Mk

mark kibort

semantics i know, but supercharging can be turbo or belt driven.

and there were quite a few driven superchargers (non turbo) used in aviation over the last 50 years.

MK

[QUOTE=928SS]fwiw, GA planes I've flown/seen w/FI were all turbocharged/not supercharged... but it's a minor point as there were a few supercharged war birds back in the day.

QUOTE]

Pfunde

Brett, let me know what happens, I'm very into doing the same - and we got the same engines so setup should be simular..

Steve 88

1) I don't drive my shark very hard that often
2) I can't afford a Supercharger or a Turbo set up
3) Emissions control in my area includes visual inspection

If I saw a reliable wet 75-100 shot NOS installation on a S4, I might be tempted to copy it.

mark kibort

Ive had it on the 4.7 and the 5 liter. only complexity on the S4 would be where you would want to put the nossil. probably the rubber duct below the MAF, would be easy. another way would be to tap a hole in the MAF below the hotwire, witih a nosil that pointed toward the engine and away from the hot wire.

mk

Imo000

Tapping the MAF would probably be the best, simplest and most reliable setup. Is the tread on the nozzle NTP?

mark kibort

it was a taper'ed male. I tapped a hole leading to the plennum where the A/C air injection used to be on the front of the plenum, (actually tapped the old plate that mounts to the plennum) strattling the two lines, fuel and NOS around the oil breather line. (tight , tight fit!) as you turn the NOS/Fuel nossil, it got tighter and tigher due to its taper'ed thread design. (Nitrous Express )

mk

Brett928S2

Hi Mark,

Im GETTING some of the parts I need at the moment..is a bottle heater needed ?
I plan on a 11 lb bottle mounted in luggage area at first ,then another matching 11lb bottle either next to it or on other side ...

Two questions....

1, Bottles next to each other or separated (better for temperature ?)
2, As my car is usally warm....around 70 F will I need a bottle heater or two or not at all ?

All the best Brett


928 S2 AUTO V8 4.7 LTR 1986 IRIS METALLIC BLUE WITH X-PIPES ,RMB ,PROMAX CHIPS, KICKDOWN SWITCH.K&N.
PCGB UK 928 FORUM MODERATOR

Jim bailey - 928 International

I found this interesting information..."German aviation engines were of the direct fuel injection type and could use emergency methanol-water and nitrous-oxide injection, which gave 50% more engine power for 5 minutes of dogfight. This could be done only five times and then the aero engine went to the scrapyard (or after 40 hours run-time, whichever came first). " ..... seems in that application you got 25 minutes with Nitrous or 40 HOURS without. But if some one was on your tail hit that button !!

Jon B.

I would run a bottle heater AND a purge personally. There is no other way to regulate pressures within the bottle better than these two. Make sure you can route a blow down tube from the bottle(s) to the outside of the car. <--That is a mandatory saftey concern right there. This might mean you need to either drill a hole from the bottle area, OR instead of using the supplied tube. Run some braided or blue pushlock type fuel hose from the bottle(s) to a location of your choice. Either way, you dont want the burst panel on the bottle valve venting into your car IF something happens!

Jon

AO

#1 - Doesn't matter IMO.
#2 - I would say yes. At 70*F you bottle will be pressurized at about 600-700 psi. The heat brings it up to 1100 psi which is what you need fot it to work correctly. That said, if you leave it in the hatch area on a sunny day, it'll easily get up to 2000 psi, which was a bit scary for me the first time!

Personally I think you should have it, because on a cool morning or evening of you loose pressure, you loose HP!