Been a long time since I posted but it's time to do some modifications to the sedan and I need some input.
I plan on installing nitrous on my 1973 sedan with twin 32/36 Downdraft Webers and a strong built A15. Pulling 8k RPM's is no problem on this motor.
What's the best, injecting it through the carbs or directly into the intake? The injection will be miminal so no chance of launching the vehicle or at worst, blowing it up.
Thanks.

Dual 32/36's?
I assume that you must have a carb set up similar to the L series one that MatBigHat posted a picture of recently.
Seeing as how I've never seen a nitrous plate for those carbs, I'd say your best bet is to use nozzles.
Just use two. Place them in the intake runers, right before where they split into to two to feed each cyliinder.thing about nozzles is, they hit hard.
If you go to the nitrous oxide systems website, you can download the jetting maps for nozzles on a small shot. they have a table from 6HP up to 60. (Per nozzle)

If I had to, I'd go with the 'wet type' fogger system with carbs, this avoids you having to richen up the carby for mixture safety. Doing this gives you crap 'non-nitrous' fuel economy.

Personally the $500-$1000 would be better put towards putting a turbo/blower on the engine

I guess it depends how cheap it is for you to refill nitrous bottles. Personally I believe the bang for buck is worse than a $2 hooker.


My 2c inclusive of GST.

Id go with this style direct port.

So this is what I got. Custom made intake. I built this a few year ago a haven't done any mods since then. I thought I tinker with the car again.

Four wet nozzles would be ideal, but you can get away with two. This will save you a few bucks. Plus, with (to the best of my knowledge) the smallest shot you can run per nozzle being 6HP, a 24hp minimum boost is a fair whack. Plus with two it'll be cheaper to rejet them to up the gain.
You have the distinct advantage of being in the US, where all that stuff is dirt cheap. (Including nitrous refills)
The other apealing feature of chemical supercharging is that when you arent sqeezing it, the engine can have smooth operation, and fuel economy. I will be fitting a single fogger nozzle between the carb and blower on my datsun some time in the future.

Thanks.
Might think I'm crazy but I am building my own NOS System. For the nitrous itself, I'm using N2O Whipcream Cartridges.

N2O for Whipping Cream

There's going to be some testing involved of course but at $15 a case (24) I figure that's about 24 passes at the track.
Next race night is just over a week so I'm looking to get this done by the weekend and test it all next week. Currently collecting all the parts.
I'm running high octane airplane fuel and with the nitrous, I should have enough to compete in my bracket at the track.
I'll post some updates.

Don't waste your time!
Those bulbs contain fukc all gas. A whole box of them would contain so little gas that even if your used them all at once with no extra fuel, you'd be lucky if it was enough to make a gas anyliser register the nanosecond of leaness.
Those bulbs are only good for whipping cream, or inhaling

Well, if it doesn't work at least I'll get some use out of the cartridges.

now that's a sensible approach to dddw's using a custom intake rather than the elbow attachment to the su intake




like to see multi-angle pix & a macro if you get the chance