Date: Sun, 10 Nov 2002 19:12:32 -0500
From: KeithG <noonenopsamspring.com>
Subject: Re: turbo, turns, technique?


If you are willing to tweak it a little, the lag can be reduced significantly. My experience is with a '92 with the TE05 turbo, but it would not be too different with the Garrett. The lag is due to the very compromised timing curve. Even without tweaking the APC controller for more output, enhanced drivability of the turbo can be achieved with a couple of timing modifications. This 'lag' is mostly nonexistent in the trionic engined cars (94+ NG900 and 9k). These cars have a much better timing map as well as other enhancements. The wastegate springs in these always droop over time. The result is less basic boost which causes the APC to 'work harder' to attain normal boost. This is a simple adjustment. Every C900 I have looked at was at least a couple of PSI down on basic boost. Peppiness is improved when this is returned to a stock setting. Also, it is a question of your adapting to the car. They do need a little more rpm than a NA car of comparable hp for launch. KeithG Lance Morgan wrote: > I've been looking for a c900 for the past few weeks, having briefly > had an 86 900T years ago. > > Drove an 3dr 85 900T 5 spd (US) today, bringing back mostly v. good > memories with one exception. > > The good: overall just think v. highly of the casual elegance & > uniqueness of the c900 - driving position, cockpit, A pillars, curved > windshield, solidity, carrying capacity, handling, ignition location, > rotary switches, body style (I'm a fan of the pre-87 rect. > headlights), and many more this group's members are so familiar with. > I feel instantly at home just sitting in the car. > > But I (again) felt a bit uncomfortable with the turbo - on/off boost - > specifically in trying to balance the car in a turn. > > One thing I wasn't doing properly, was consistently keeping the RPMs > up, among other factors > > Digging around a little has shown a trend, apparently not only with > Saab, of moving from larger turbines (like the pre-90/91 Garrett T03) > to the Mits Te05, the latter apparently used for both LPT and full > turbo apps. > > Anyway - folks are buying/have obviously bought NA c900s, but has it > been due to preferred throttle response over the turbo (and > undoubtably vice versa)? I realize it's mostly preference and > compromise: the turbo is stellar at 3rd gear overpassing, etc - the NA > clearly can't match it (nor in aftermarket cost-effective performance > increases) > > Experiences/suggested techniques with learning how to drive a T03 > (realizing this can be changed to another model), esp in turns? My > test drive was too brief, and not on a good route - does the turbo lag > nearly/completely disappear if the tach is kept up (and there's got to > be to it than that)? > > I confess to being swayed by the 'turbo allure' - what Saab has built > a big part of its heritage on. But I'm also going to try and track > down a 91-93 NA c900 Return to Main Index

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