Re: really inexpensive horsepower? (kinda long) - Saab Performance Bulletin Board - Saabnet.com
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Re: really inexpensive horsepower? (kinda long)
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Posted by John (more from John) on Wed, 11 Sep 2002 23:30:27 Share Post by Email
In Reply to: really inexpensive horsepower?, NSK, Wed, 11 Sep 2002 14:28:59
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NOS is no problem on a turbo'd car, you just have to be aware that you'll get a greater than rated increase from it. Typically on a boosted car you'll get 25-35% more (sometimes more) power from it do to the cooling effect and increased cylinder pressure. You'll also have to watch more for detonation, but if you keep it reasonable it's not a huge problem. Turbo spool up will also be MUCH quicker, due to the increased exhaust volume. Some people will say that injecting the nitrous directly into the turbo will also create instaboost, and they're right. The problem is that the instant temperature change can make the impellers brittle and that could be nasty. Don't activate the nitrous til higher rpms to avoid excessive wheel spin and torque on your drive train.
For something a little cheaper, dunno for sure if it applies to your car, but on my 97 9k the hose for the bpc was connected right behind the turbo. I did some checks, and the intercooler causes a couple of pounds of pressure drop. So when the computer was seeing 7psi at the turbo, the boost guage was only showing 5 at the intake. So I plugged off the hole at the turbo and ran the line for the bpc to the intake manifold. Gained me a couple more pounds of boost, and a noticeable seat of the pants power gain for 50 cents worth of hose. The drawback is a little more boost spiking (a lb or 2), so if your close to the fuel cut off limit it may not work for you.
Hope this helps.
John

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