924Board.org

[nickthompson]

[Fasteddie313]

Why can an NA 924 hold 400+HP turbo but not easily 200HP on nitrous?

You can blow up a 924 @ 200HP on turbo too, with a bad tune, as you could nitrous with a bad tune..

But with a good tune, it should hold serious nitrous power as well as it does turbo power..

Why would it not?

We're talking about only around +50HP, it would hardly be worth installing a turbo for only 50hp.

Done correctly, I doubt it would have a problem holding +200 nitrous..

But like I said, step 1, obtain a premium mechanical operating condition.
Better be in good tune or you might melt your pistons with no mods..

If I could, I would like to put a little 30hp ish nitrous shot on my turbo, say any time above 2500rpm until boost reaches 10-13psi then off, to spool my turbo NOW! Might need something like that some day with a turbo good for 2 bars, the day after I trip over a duffel bag full of cash
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80 Turbo - Slightly Modified

[nickthompson]

Adding power with nitrous and adding power with turbosome are two very different things. The nature of nitrous causes an extreme increase of heat. I'm aware turbos add heat too but that is not the primate function of turbos. Nitrous by it's self does not even burn it is a not flamable oxidizer. That means your running a higher quantity of O2 per fuel. It's very similar to what give nitro methane it's performance advantage. Some of the Diamond custom pistons with a ceramic coating would probably help but if you're going that route you might as well build power the old fashioned way as your going to be spending $900 on pistons. Nitrous on a Sportscar doesn't make much since because the goal is to power out of corners. If you hit the button that offer you'll be in trouble. If you want straight line performance get a fox body Mustang, those are cheap and easily modable.

[Noahs944]

Thank you Nick for supporting your arguments.

[Rasta Monsta]

[nickthompson]

[Rasta Monsta]

[mikeycrum14]

i was confused about whether it was all needing to be done at once (head rebuild + hot cam + cometic gasket). but ya i gotcha now. might do that swap this summer...
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1981 924 - Alpine White, First car! LSD. - SOLD
1989 Foxbody - Oxford White Turd
1992 Miata - Freaking Red
1987 300zx Turbo - Also White
1991 Miata - White field find
1987 924S - Alpine White, Offroader Build, possible future TDI swap

[mikeycrum14]

which hot cam to buy?
_________________
1981 924 - Alpine White, First car! LSD. - SOLD
1989 Foxbody - Oxford White Turd
1992 Miata - Freaking Red
1987 300zx Turbo - Also White
1991 Miata - White field find
1987 924S - Alpine White, Offroader Build, possible future TDI swap

[ideola]

1. Remove intake and head
2. Do a basic head maintenance, consisting of new valve guide seals, and relapping the valves
3. Replace head gasket with .027" Cometic
4. Replace all other top-end gaskets
5. Put in a new cam

This one: http://garage.ideola.com/prod-EngineMods.html#Edelweiss

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erstwhile owner of just about every 924 variant ever made

[mikeycrum14]

cool. length of time this is gonna take?
_________________
1981 924 - Alpine White, First car! LSD. - SOLD
1989 Foxbody - Oxford White Turd
1992 Miata - Freaking Red
1987 300zx Turbo - Also White
1991 Miata - White field find
1987 924S - Alpine White, Offroader Build, possible future TDI swap

[ideola]

Cams are in stock, although I need to order shims, so that will take about a week or so. Head gaskets are made to order, and typically require about 7-10 day turn around.

On the NA, you'll want to plan half-day for disassembly; half day or so for servicing the head; and half-day + for reassembly and bedding in the cam.
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erstwhile owner of just about every 924 variant ever made

[Fasteddie313]

[Fasteddie313]

I would like to see you post a thread about your car as a whole, with some pics and a general description of the projects it needs such as your ceiling, interior, body, heater, etc., what you are starting with and what you plan to do with the car..

What we thing you "should do" is really just theory without knowing more of the backstory of what you want to do, what you can afford to do, and what you are starting with..

I mean, if you've got a ton of money and your car is in premium shape, you might want to add lightweight tappets, pistons, and rods while you're in there, but if their is anything questionable about your CIS and ignition those things should really be sorted first before you throw more variables in there re engineering the top end of your engine..

I don't even know what year your car is..

For all I know it could be a 77 with an absolutely worthless head that is not worth using or a euro with already high compression..

Make a thread about your car, what you have, what you're working with, and put your exact car description in your signature so people can know exactly what car you are talking about whenever you say anything like..

77.5 924 NA
or
1983 942 NA euro
or
81 NA 5-lug
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80 Turbo - Slightly Modified

[mikeycrum14]

ill get a thread going soon... basically it is a stock left hand drive 924 with roughly 43k miles. approximated after the odo stopped and I had to fix the little red gear and wind it up some.
_________________
1981 924 - Alpine White, First car! LSD. - SOLD
1989 Foxbody - Oxford White Turd
1992 Miata - Freaking Red
1987 300zx Turbo - Also White
1991 Miata - White field find
1987 924S - Alpine White, Offroader Build, possible future TDI swap