type 4 turbo guys-, what turbo did you pick and why- Options

[ottox914]

Alot of turbo talk lately. Just curious, for those who have been there/done that, what turbo did you pick, why, and if your project is on the road, how do you like it?

[ottox914]

Mr Mueller, the ?'s you pose have already been addressed, in my mind, but not in print, so here goes-

Engine is a relatively stock 2.0, euro p/c's, little shaving to the heads, probably around 9.2:1, don't know, didn't build it myself.


Driving needs- more fun! And autoX, so torque>Hp in my mind.

Got the Bell book, refer to it daily when day dreaming...

I know, there is no one size fits all solution... just looking to learn from the experience of others, what has worked, what has not, and why.

AutoX classing. Turbo=SM2, which is fine. There are plenty of fast cars there, usually 1/2 of out top 10 come from that group. I'm consistantly top 30 or better out of 150+ car grids with the relatively stock motor. One of the fastest SM2 cars is a 73 Opel GT, with around 180 at the crank. So I'm shooting for around 180 at the crank as well. It may not be a national car when I'm done, but our chief driving instructor told me when I started all this silliness 5 yrs ago- you can build a car you enjoy 6 days of the week, and it is what it is on the 7th day, accept that and drive it, or you can build that world beater ultimate car for the 7th day, but don't expect it to be streetable for more than a drive to the DQ on those other 6 days... I'm building a 6 day car, and it is what it is on the 7th. I've had 2 top 10 finishes in my car this season, (on short tracks, of course) and have proven to myself and anyone else who would care that I can drive and the 914 certainly IS a weapon to be respected!!! Building the car I want to own, not necessairily the one I'd want to race(nationally).

My theory on the turbo project- I built a turbo Ford Focus that ran an "Aerocharger" brand turbo, 8psi, and the Focus is known to have a high static CR and agressive timing. I used "aquamist" water injection, but later changed to an air/water system with better results. Some chip tuning for the timing, larger injectors, and I had a totally stealth honda destroyer. Sold it with 66k miles on it, it now has 111k miles, and still going strong. I like the idea of keeping some compression for off the line grunt, adding some turbo for midrange, using sensible tuning parameters, and I ended up with a great daily driver. I hope to duplicate that success with the 914. It may not end up being as totally optomised as one of Jakes setups, but, hey, I like to mess with cars a bit, and if I was building that 7th day car, looking for the last tenth of a HP, Jake would be my man. At this stage of the game, I'm not, so lets share research and have some fun in the garage.

Any help on web sites with compressor maps?

Currently considering a "low pressure" turbo off a Saab 2.0. Any thoughts on that?

Mueller, I'm sure you've done your own research resulting in your choice of the turbo off the Stealth, but if that is at its max pumping 164 hp, is that maybe a bit small? I would think, being at the high end of the efficency for that unit, that you could be pumping alot of heat as well as boost. What were your thoughts in picking that unit and managing the heat? Not being critical, just asking...