91 SSE, exh/intake/ignition for best MPG - Page 2 - 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 09-29-2007, 09:41 PM   #11
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The MSD 8224 coils ARE hotter than the S2 L67 coils, but NEITHER will give you any more power. They'll only smooth out the idle a bit, and be a bit more efficient through the midrange.

Don't buy new. Go to the wrecker. Any 97 and newer L67 will have the ICM and coils you need. ANY 3800'* ICM and coils will be a benefit.
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Old 09-30-2007, 11:13 AM   #12
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Quote:
Originally Posted by peanutbuttaguts
Willren, I simply asked what others have done and what their experience was pertaining to fuel mileage. I am well aware what the effects of unrestricting a N/A exhaust will do. low end is lost high end flow is gained, this is an obvious. I wasn't aware how dramatic the effect is on these cars because I am not a bonneville guru, this is why I ask questions on this forum.

IN THEORY, a restriction is a restriction, no matter what causes it, period. be it a cat, a smaller diameter restrictor, or a potato, its all serving the same purpose, RESTRICTING THE EXHAUST, yes i understand the cat serves another purpose also, just trying to prove a point.
if u wanted to prove a point, the point that you would prove, would be that your engine was designed to produce all of its power down in the low rpm range rather than up high, meaning that increasing the flow of your exhaust very much will only kill your power unless you replace the cylender heads and cam with something designed to also flow more (which is out of the question) and would put a hurt on ur fuel econ for sure.
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Old 09-30-2007, 12:36 PM   #13
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good point,

Looks like these motors like a little backpressure, I guess I can spring for a new cat.

Im not looking for any horsepower, but I think I am going to swap in the s2 L67 coils and ICM, im guessing thats ignition control module?

Where on the car roughly is the ICM located at? Just so I know when I hit the boneyard.

thanks
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Old 09-30-2007, 12:39 PM   #14
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Just forward of the alternator, mounted on a bracket off the passenger side of the front cylinder head, under the coils.
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Old 09-30-2007, 04:52 PM   #15
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Cool, I know exactly what your talking about. Ive got the coils off right now cleaning grounds.

Thanks
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Old 09-30-2007, 07:19 PM   #16
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If you use the Type 2 system and the Wires for a 93 Bonneville the install will look like this


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Old 10-02-2007, 02:33 PM   #17
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Cool, thanks for the help and the pic. I just got my car running TOP, had to replace the computer. Now I can mess with it a little.

Im going to run the 97+ ICM and coils, along with MSD super conductor wires, and a drop in K&N to start. Im going to check prices on the MSD coils versus new 97+ coils. If they are not a whole lot more expensive I might run them. Im also going to replace the rubber intake hose with a straight 3 in. pipe.

You guys say to run NGK tr55'* in this thing also?

I'll report back after install with pics.
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Old 10-02-2007, 03:14 PM   #18
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Don't waste your money on MSD Superconductor wires. Thicker insulation won't net you any power.

Stick with Belden Premiums or Autolite Professional wires in 7mm.
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