Saab turbo?

[Anonymous]

I have an 89 saab 9000. It has a 2.0 intercooled turbo engine. I am thinking of using this turbo setup on my new 200 engine in my 63. What do you think? does anyone know about this turbo? What are the stats. Can it be used for a mild engine build?

 

[TCIC 300ci superbeast]

well i really dont know about saab turbo but i do know about small stock turbos. i think that it would work.

 

[hasa68mustang]

I ran a turbo off a ford probe with an intercooled 2.2 liter and it was good for 15 second quarters with an open rear end, no tuning and letting off because of pinging. from what I read it could only supply enough airflow for about 220 RWHP. I sold that setup because I was looking for more... alot more. depending on what your definition of a mild build is it would be usable but not completely optimal

 

[Bort62]

Well, I am running a turbo off a 80's something Slaab w/ the compressor section from a volkswagon.

It makes more boost than I can use yet.

 

[boston774]

We have a 2000 9-5 Aero. It's a 2.3, seems to crank out pretty good power - will outrun Mustangs up to 98s, especially on the highway.

FWIW, I suspect the turbo would be on the small side for a six. I've heard that guys were getting 350hp or so from these motors with stock turbos, but that is also with a very good 4-valve head and hot cams. I don't think they were running gobs of boost.

(The thought of explaining to my wife why her car needs a new motor gave me pause every time I thought of messing with it...)

 

[XPC66]

i think the early Saab turbochargers were a T3?. The later GT17 had all soughts of problems because of coking in the CHRA. I reburbished one of these and it required a machined bushing in the diffuser plate for the piston to seal.

 

[Anonymous]

Is there anywhere i can find out the stats on this turbo? CFM, max boost, things like that. I know the Saab had 9.0 to 1 cr so that is what I am shooting for. I am looking for an engine combo that runs 14's and has good street manners.

 

[wallaka]

I did a little research, and what I found was this: It is a Garrett T3, either 40 or 45 trim. .48 turbine A/R, .45 compressor A/R. This is a pretty small turbo, so it should have excellent spool characteristics at the expense of top end restriction.

Compressor map:

To use this, you calculate the CFM that the engine will use, and plot that on the map. You want to be in the highest efficiency island. For a more detailed explanation, visit this page:http://www.rbracing-rsr.com/turbotech.html.

From my calculations, it will work, but will not be as efficient as a larger turbo would be. It'll still be over 70% (@10 psi, 65% VE, 4000 rpm), though, and that's good. This is if it is a 45 trim. If it is indeed a 40 trim, it'll be in a choke situation, and that is not good. Boost will need to be limited to

A pretty good calculator at Ray Hall's site:
http://www.turbofast.com.au/turbomap.html

For a 200: Bore=3.68", Stroke=3.126". I used 24° C (about 75° F) and 65% VE, which is perhaps on the high side.

 

[Anonymous]

So If it is a ''45'' and it is on the small side are there parts to up grade it to make it more efficient? I am looking to turn about 5500 rpm max.

 

[wallaka]

You could do a hybrid, using the turbine that you have now and a larger compressor housing. Or just get a bigger turbo. Those are basically the choices that you have.

 

[Bort62]

Well,

If you want to run 15 PSI (pressure ratio of 2.02) and are running it on a stock 200, you are about perfect on that compressor map. I am guessing (See my other thread about VE's) that a stock 200 is in the 15-20 lbs/min range @ that pressure. Or I should say, I am guessing about the VE's and have calculated ~15-20 lbs/min.

 

[XPC66]

You guys do know that the Saab ran the turbo off three of it's six cylinders?

 

[wallaka]

Really? That makes no sense, because all of the 9000s I've ever seen were four-bangers.

Plus running a turbo off of only half the cylinders wouldn't work well for several reasons.

You sure about that? My buddy's 9000 Aero uses all four cylinders.

 

[Bort62]

You guys do know that the Saab ran the turbo off three of it's six cylinders?

That seems like a slightly inane thing to do.

 

[XPC66]

I'm talking about the 9-5 six turbo, which I assumed you were mating to your sixes. It's a 150kW single bank 3.0 = asymmetrically turbocharged V6 running at 3.6 psi.

 

[Bort62]

Must be a southern hemisphere thing...

 

[XPC66]

I don't think so. Probably a non American thing.

 

[wallaka]

The Euro-spec ones I've seen don't do that either... They have the same engines as the Americans do.

Very strange.

 

[StrangeRanger]

I suspect it's a way to reduce throttle lag by allowing half the engine to exhaust freely. Makes for a smaller turbine and lower inertia which also reduces lag.

Historically SAAB engineers have never done things like anyone else. It often seems like they've never even seen another brand of car or at least never seen anything on one worth emulating. GM'sa acquisition of SAAB and badge-engineering one on the Malibooboo chassis has sadly changed all that.