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Discussion Starter #1
hey everyone,
I may be young and foolish but would installing an electronic boost controller on my 900se have the same affect as an upgraded ecu? When reading the horsepower upgrades on various performance sites it seems that they are charging you for turning your boost up, and if this is the case they are charging way too much. I was also wondering if an ecu upgrade turns off the rev limiter and top speed regulator?
I have many other questions but thats it for now.
thanks for your time,
elliot
 

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Welcome to SaabScene

The SAAB Trionic ECU is a complicated beast so the general advice is to stick to the tried and tested tuners who specialise in SAAB, eg, Hirsch, Speedparts/BSR, Maptun, Abbott. While the most visible sign of a remapped ECU will be an increase in boost, a remapped ECU will also likely have altered the timing and fuelling rates while maintaining knock protection. That's stuff an electronic (or manual) boost controller won't do.

That said, plenty of people do use E/MBC devices safely with the aid of a calibrated boost gauge, high octane fuel and careful adjustment but they are losing a lot of engine protection. I guess you pays your money and makes your choice.
 

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SteveN pretty much said it all. Simply using a boost controller will up the boost and power but the trionic system is then slightly handicapped for knock protection then. Also, an upgraded ECU will also have altered fuel and timing settings that will better take advantage of the added boost, which means more power than a mbc or boost controller will give you. As for your other question, I cannot say for the other tuners, but when I got my ECU custom programmed at Hirsch, the top speed limiter was removed at request. the rev limiter did not change as the engine's power tails off so much at or near 6000 rpm that going much past that is a waste of time.
 

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Discussion Starter #4
thank you guys for answering my questions. I will look into the ECU even though it is expensive but if I have the money i think it would be nice to turn down the boost for daily driving with an EBC to decrease wear and tear on the engine.
thanks again
elliot
 

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Although the theory of turning down the boost for daily driving seems on first thought a good idea for engine protection, my view is that "normal" daily driving itself will give you plenty of protection - in other words not putting the pedal to the metal every time you pull away, and not holding it at peak revs for protracted periods.
 

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I can agree with Bunsen on that comment. Also, I forgot to mention that as for cost, a manual boost controller such as the Dawes or TurboXS units are a good alternative to use while saving up for an ECU upgrade. I just believe that the ECU upgrade gives lots more power and is a better all around package than just going the boost controller route.

And I also forgot to add earlier, welcome to Saabscene!
 
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