What order should I MOD my engine - 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 01-04-2009, 06:17 PM   #1
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Default What order should I MOD my engine

This is little more then a suggestion of the order to MOD your engine. This is my opinion and I encourage others to add to this to help new members. This is just a guide.

Cold air intake, or fenderwall intake with a good filter such as K&N.

180* thermostat, this is optional.

Drop pulley size, no smaller then 3.5"

colder spark plugs, 1 or 2 rangers colder

PCM upgrade, performance tune

Shift kit

Some type of scan gauge that reads KR (Knock Retard)

Exhaust upgrades
Series 80 muffler, or series 40 if duels.

Free flowing cat

Powerlog front manifold, or PEMs Best a good set of headers such as TOG

Valve train
Rockers, such as 1.9:1 roller rockers

valve springs, No higher then #105 springs

Oil restricted push rods

CAM (do research on this to find best choice)

New timing chain, sprockets, and tensioner

Advanced upgrades

Port and polished LIM

Port and polish heads

Port and polish supercharger Gen5 if possible

larger throttle body port and polish

Larger injectors

Transmission rebuild. Lower gears.

Intercooler

NOS.

Lets here thoughts on this list.

Last edited by Danthurs; 01-04-2009 at 11:50 PM.
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Old 01-04-2009, 11:15 PM   #2
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What exactly is knock retard
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Old 01-04-2009, 11:21 PM   #3
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It'* when you have preignition. If the air fuel ignites before the spark plugs fire you can chip the piston, among other things. When the knock sensors detect knock they will tell the PCM to pull timing to protect the engine. When you have KR you need to address that problem by reducing heat and pressures.
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Old 01-04-2009, 11:40 PM   #4
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Dan,

Who makes a good PCM upgrade for this vehicle. I have a 1992 Bonneville, 3800, series 1.
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Old 01-04-2009, 11:44 PM   #5
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Danthers, unless I missed it, you gotta add colder plugs in there somewhere.

Don
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Old 01-04-2009, 11:46 PM   #6
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This is the only place I can think of.

Sinister Performance, LLC.
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Old 01-04-2009, 11:50 PM   #7
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Quote:
Originally Posted by NWASSEi View Post
Danthers, unless I missed it, you gotta add colder plugs in there somewhere.

Don

Thanks, just added that in.
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Old 01-05-2009, 09:11 AM   #8
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To get the most from things, plug changes, etc should be determined by how the car is running and reading the plugs.

The NA motor can benefit early on by porting a lower manfold. Another item for this that won't improve or hurt performance is to plug the coolant to the upper manifold. This will eiliminate the issue of the EGR area cracking and allowing coolant in the UIM to flow into the intake tract.

To start modding though, a first suggestion is to start with a car that is up to speed on maintenance items like brakes, struts etc.
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Old 01-05-2009, 10:07 AM   #9
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You are correct. This list assumes you are starting with a firm foundation. Solid engine and transmission, strong brakes and suspension.
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Old 02-05-2009, 12:04 AM   #10
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Dan do you know of any members that have the nos setup already. If so that would be great never seen a bonnie setup with it before.
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