I wish I still had it, it would be on the car if I did. I used to have a spare bottle too, lost it, so don't have anything now. Looking to see if I can find a used nitrous kit on the cheap right now. Preferably a wet kit so I can keep it on until I cross the line, as these ID1300s are about out of fuel.

 

That's what all the guys at my drag strip say to do. Nitrous to get it spooled out the hole. But I do want to see what happens with the spool valve closed.
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TEB is what they used to light the engines on the SR-71 and the F1 rocket engines on the Saturn.

--Ian

 

Yeah, I need some nitrous.

 

Impressive results.

 

That Volvo system is interesting, but why would they shoot the compressed air into the exhaust to spool the turbo instead of directly into the intake to burn more fuel? Seems like the whole point is to get more air into the intake.

 

My experience was not a youtube video but rather a friend's R32 GT-R.

Pat, the other way to get what you are looking for is a higher stall converter. The transbrake will ideally hold the engine at an RPM where the turbo has started spooling so the boost (and torque) is already there when you release. The balance is between boost being too high and spinning the tires and too low and launching less forcefully...

...or hooking powerfully and doing a wheelstand.

 

It doesn't store enough air to add say 30hp until the turbo kicks in, instead they shoot into the exhaust to spool the turbo up, which adds probably more power than shooting into the intake. Also probably the fact that without something physically forcing the air into the engine like a turbo or supercharger, the injected air would slow down air speed or stall it pre-injection. If that makes sense to you.

 

Simplicity, cost, packaging are my guess. But I have never built/used a setup like either before though. I agree air going in the motor would be better and more instant, plus you'd get the benefit of the cool air too. But I think the system would be a lot larger, and more complex.

Ah, good to know! I may get the converter changed in the future, but it's perfect for a street car right now, just too tight for racing.

 

Yep, that what high stall converters are for. As for over-spooling with a transbrake and high stall, I would think the throttle could control that. No experience, though.

 

Let's see those Miata wheelstand videos.

--Ian

 

don't show corky that video, we all know only heat turns a turbine.

 

We won't let you rest until you need wheelie bars.

 

The nitrous spool up on that SR is just wild.

 

I always thought the procedure was to setup your launch control as anti lag with spark cut and lots of retarded timing, if your converter spools to 3k set launch at 2800, build boost and then when you launch it'll flash the converter and your boost should ramp up from there.

 

Will do.
Noted!
I'm going to try it, but the convert put load on the motor, so if you cut sparks or pull timing, the revs drop as it's not in neutral.

As an update, I was contacted by Newaza on here, he actually built and tested a compressed air setup on his car to spool the turbo! And it works! Looks to work dang near as well as nitrous as far as spooling the turbo quickly goes. Granted you wont' get the extra HP from burning the nitrous, but you do get the quick spool. Good enough, that's what I'm going to do. I gotta do a lot of research and design, and I will, but that is the plan for now.

 

Are you thinking you'll dump it into the exhaust just to spin up the turbo, or into the intake to generate the boost?

 

Into the exhaust to spool the turbo. Beyond that, I don't have really anything figured out yet, but that is the basic idea. To do the compressed air into the intake manifold instead would be considerably more complex. His setup he built was simple, and worked really well, I bet the spool was at least as effective as a 50hp shot of nitrous if not better. Getting that kind of spool, without having to refill a nitrous bottle, yes please!

 

Hm. My initial inclination was that dumping it into the intake wasn't going to do anything, that it would run out in a fraction of a second. I did a bit of back-of-the-envelope math to prove it and decided I was wrong.

Let's assume a 5 gallon tank at 200 psi (this seems to be about at the upper range of what's reasonable to stick in the trunk). That's 18.5 liters at 13.6 atmospheres, or about 250 liter-atmospheres. Assume the motor is at 3000 RPM, is 1.8L, and we want 15 psi of boost to spool it, we need 45 liter-atmospheres per second to make that boost, so that's about 5 seconds of boost.

So OK, maybe it isn't completely stupid for a drag racing application. Looks like it'd need a 1 inch air line to dump those 45 liters/sec (90 CFM) though, and I hate to think how big the regulator would be..

--Ian