Date: Fri, 06 May 2005 13:32:17 GMT
From: "Dexter J" <>
Subject: Re: rrett t3 turbo

Salutations: On Fri, 06 May 2005 09:01:49 +0100, Grunff <> wrote: > James Sweet wrote: > >>> es wrote: >>> >>>> Hi i have a 1990 saab 9000 cd 2.0 turbo with a garrett t25 turbo on it >>>> can i run the t3 after the t25 so it wll be twin turbo the t25 will be >>>> the lowend and the t3 will be the highend boost. or is it better to >>>> just run the t3 >>>> >>>> and where can i get a good t3 turbo >>> >>> Do you have any idea what would be involved in doing this? >>> >>> More to the point, do you know how crap the car will drive if you do >>> this? >>> >> It should drive pretty well, just more lag. I've got a car with a T3 >> and like it, though it's not a 9000. > > No, I'm referring to "can i run the t3 after the t25 so it wll be twin > turbo". It would not drive well. Agreed Grunff. If someone really wanted to go twin turbo - you might get away designing a custom split header and IC intake so that one turbo spooled up earlier than the other and then didn't back flow into the smaller turbo. To do this - you would really have to do some heavy work on which pair of turbo's you would need to pull it off. T3 and T25 wouldn't be it. Personally, I think you would want to match a smaller pair that simply had different boost controllers for the same affect. You would then have to custom chip all the computer controllers from fuel rates to waste gates to account for the higher rates of pressure so as to stop the car from cutting back ignition to account for what it would perceive as being an over boost situation. You would need to build some sort of airflow kit to bleed off the extra heat under the hood too. Common wisdom on the greater problem is to swap out the intake cam with a 2.0 N/A intake cam (which is claimed to increase lower end torque in turbo engines). Go with a 3 inch exhaust system from the turbo flange to the tailpipe, changing out the turbo after talking to Maptune about which chip and turbo to accommodate the new curves. This will impact total top end - but - will give you earlier and stronger boost through anything to 110mph. Personally - I think you might be better off simply going with a fresh stock turbo, a more open exhaust, bigger IC and new chips first (don't forget to pull the AC unit) - and then see where that takes you. Be warned, there is *a lot* of kit on both sides of the crank stubs that needs uprating as befits your engine modifications. -- Radio Free Dexterdyne Top Tune o'be-do-da-day Doris Day - Whatever Will Be all tunes - no cookies no subscription no weather no ads no news no phone in no sign up required - all the Time

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