170 vs 205? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 07-04-2004, 04:13 AM   #1
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Default 170 vs 205?

Can someone list the hardware and software difference of the to engines, I have an 92 Bonni 3.8 looking to mod, got a lot of good ideas off this forum other than the obvious; thermostat and cheese grater in the TB and exhaust system, like to start with the basics.
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Old 07-04-2004, 06:02 AM   #2
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Cheese grater? LOL

Me and Taylor were talking to Jeff and Alex of the Illinois GP Club and they havn't removed the MAF screen (I'm assuming thats the cheese grater). I have no plans to remove mine either because no one has dyno'ed this and the benefits are only word of mouth.

As for the differences, they were subtle over the years. The TB grew in size and I believe the cam was altered. I dunno much about that, but I do know you can make a L27 fast.

Like you said, the basics are 180 stat, cooler copper plugs, wires, exhaust, etc etc.
The intake can be any cone system for the most part, just build your own CAI box if needs be. For an exhaust don't go any larger than 2.5" on an L27. After you get through these "basics" you either have to tune to your hearts desire to get every ounce of power out of the engine or take the quick route like I did with my old car...nitrous.

If your seriously interested, take the time to research your options. We don't want another dead Bonnie here.
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Old 07-04-2004, 12:56 PM   #3
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It sounds to me like you want to copy the Series 2, by taking L36 parts and bolting them onto your L27. This isn't possible. The valvetrain sequence is totally different between the 2 engines.
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