Hi All,
I have been designing my CO2 setup for my car in the last few weeks, planning where its going to run, fit, mount etc and I had an idea.

What if you ( for the 1/4 mile) spooled your turbo with co2 or compressed air instead of the exhuast gasses. You would get faster and cooler spool up, mount the turbo anywhere you like, you could run any exhaust system you like, no heat soak... sounds like all +++ to me,

You could run if on a solinoid off your computer w/ injection.
Das, you almost have everything to try it for warwick?

Crazy Idea?
T54

Without thinking too much.....say on the quarter mile your boosting at 7500rpm for 10 sec at 15psi on a 2l engine.....engine will process 2l every 2 revs assuming 100% VE, 15psi make that 4l, so in one minute thats 15000l air going through the exhaust so for 10 sec thats 2500l of compressed air. a D size has 3200l. Don't know what the valves would flow?
The other thing is doesn't a turbos energy largely come from the heat in the exhaust? would this cold flow be sufficient to boost?

Wouldn't be hard to test the theory, get a bottle of CO2, a working turbo blowing into a chamber with some sort of relief valve, and an airflow meter somewhere in the system?


One down side is that you have doubled your cars greenhouse gas emissions.......

just thinking out loud:P

i was reading something just recently about a turbo set-up that runs off compressed gas (i spose it was probably CO2, can't remember)

sounds like a good idea to me, specially for drags.

surely using this system you could eliminate turbo-lag...

kai

some lateral thinking...
why use the turbo at all then?
Pump compressed air (or even 02) through turbo style "hat" directly down your throttle bodies and use a rpm sensitive regulator to adjust volume of compressed gas.

forgive my if I'm stating the obvious but, isnt the the exhaust gas expanding due to heat as important as the flow? I know that high end drag cars actually lean the mixture out in first gear to achieve higher exaust temps, so they spool up quicker.

Use N2O on the intake side.

Cram - Motors dont tend to like having C02 rammed into them through the combustion process!

[ Edited on 5-4-2007 by Turbo54 ]

yeah go the Nitrious Oxide smaller bottle more HP les weight

forced induction.....:thumb

I've heard of Nitrogen antilag systems, where a fitting is screwed into the exhaust manifold before the turbo at just the right place. THen with solenoid activation liquid nitrogen is sprayed into the exhaust header. The moment it hits the heat it expands at a rapid rate and causes and instant pressure rise inside the exhaust header, and thus boost in the manifold.

This was being duscussed in shoptalk forums for a while.
http://www.shoptalkforums.com/viewtopic.php?t=10698&postdays=0&postorder=asc&...

NO2 would be great if you werent at all worried about getting defected by the cops, but since its a street car you need to keep it practical.

Ignition retard anti-lag works wonders, plus its programmable if you want to get real serious. I can take some video of my car later today of how my system works if your interested. Programmable launch RPM + any boost pressure from wastegate to 20lb all at the press of a button on the steering wheel.

Realisticly I dont think your going to have a problem with boost response though. I expect with the 2180cc engine and the GT2871 you will have full boost by about 3500rpm in the higher gears, and it will have full boost by 4000-4200 rpm if launched in 1st at 3500 rpm. With a redling at 7000 rpm you will have plenty of drivable rpm range. It will scare the crap out of you the first time you do it too!

Cheers,
Ian

Thanks mate, Love to see your launch control,
Heath

Here's a video clip of the launch control/anti-lag setup on my R32 skyline GTS4, my other toy. I can easily achieve 20lb boost at 4000rpm as well, though i noticed for this video clip i had the stall RPM set at 5000. This was from a previous car show where there was a go-woah event that I entered the car in. Because the event wasn't judged or timed and it turned into a v8's doing burnouts for the length of the strip I decided I'd scare crap out of everyone and have smoke coming from 4 tyres, with 4 people in the car. Was great fun because I pissed off a heap of v8 rednecks with my little 2lt rice burner. I have some video of that too.

The setup uses 1 aux out and 1 aux in on the ecu, and an MSD DIS 4 (but you can use any 2 step limitor), and a button on the steering wheel. When I floor it, at 4000 rpm a relay is triggered which sends a ground signal via the steering wheel button to the MSD and the AUX in. This ground signal enables the pre-set rev limitor (5000rpm in this case), as well as tells the ecu to retard the ignition timing 45 degrees from the current map point. So at 4000rpm with no vacuum the ignition is at 35 degrees advanced, minuis 45 degrees makes it 10 degrees retarded. Once boost begins to rise, the ignition retards further to a maximum of 25 degrees retarded. 15% fuel is also added to help keep things cooler and spool it all up quicker.

At night it blows nice flames from the exhaust and out the screamer pipe from the external gate under the car.

https://isit.dyndns.org/Hosted/MOV00336.avi 

This second video is of me playing silly buggers doing a 0-60k launch in about 1.5 seconds. Handy for pulling out in peak hour traffic.

https://isit.dyndns.org/Hosted/Video3.AVI 

Sorry to everyone that I've posted this rice burner stuff here... I've learnt a lot from this car though, and am now applying some of what i've learned to my vw project.

Cheers,

[ Edited on 11-4-2007 by 2443TT ]

[ Edited on 11-4-2007 by 2443TT ]

You are a serious hooligan Ian!
Awesome!
L8tr
E

Yeah thanks! At a cost of 4 tyres in less than 8000k's...

Sold the car last week, and its gone at last by the end of this one with any luck.