What size should I go to for a little more oomph?

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You mean supercharger pulley? First off, we need to know what other mods, if any, you have. You will want a cold air intake, either one that locates the filter outside of the engine compartment (Intense-Racing FWI) or a custom made CAI sealed from engine bay heat, and I highly recommend that you install a 3" Downpipe and High-Flow cat, like what ZZ Performance and Hogan Performance sell. I also recommend switching to a 180* Thermostat from the stock 195* thermostat. After all this, you will want a PCM tune, and a way to measure Knock Retard, as it is what will cause damage to your engine.

These are known as "supporting mods", which should allow you to relatively safely pulley down to a 3.6" pulley from the stock 3.8".

How many miles on the car? What is your maintenance schedule? What is your mechanical skill level?

Also, before modding, please make sure everything on this list is up to date.

1987-2005 Bonneville / Buick 3800 Maintenance List

Run Seafoam, Chevron Techron or Gumout Regane through gasoline every 5,000 miles.

Grease: Ball Joints, Tie Rods Every 8-10k ( Green Grease or Amsoil Grease recommended)
Air Filter Every 15k (Amsoil EaA, Purolator PureONE)
PCV Valve Every 30k
MAF Sensor Element Cleaning/TB Cleaning Every 50k viewtopic.php?f=48&t=1661
Fuel Filter Every 15-25k (Purolator, AC Delco, WIX) http://www.pontiacbonnevilleclub.com/fo ... 45&t=23215
Spark Plugs Every 30-50k (NGK TR55 or Autolite 605) (Never Bosch)
Ignition Wires Every 30-50k (Napa Belden, AC Delco, Autolite Pro, NGK) (Never Taylor or Bosch)
Oil & Filter Every 5-6k or Every 6 months (Valvoline SYNPower, Pennzoil Platinum, or Amsoil )(Mobil1, Purolator PureONE, Amsoil EaO, K&N or WIX) (Never Fram) viewtopic.php?f=45&t=214
*Conventional Oil Every 3k/3 months(API SM/SN rating) (WIX (Napa), Delco or Purolator filter)
Tires: Check Inflation Pressure & Visually Inspect Monthly Rotate Every 6-8,000 Miles
Transmission Flush or Pan Drop Every 15-20k (Always make sure filter is changed when flushed) viewtopic.php?f=45&t=10193
Cooling System Flush Every 25-50k or 3-5 Years (Peak or Prestone Mixes-With-Any Coolant Only) (Never Dexcool)
Oxygen Sensor Every 80-100k (30k for non-heated) (AC Delco or Denso) (Absolutely never Bosch) viewtopic.php?f=48&t=794
Accessory Belt Inspect every 15k, replace every 100k, or as needed
Cabin Air Filter Inspect and Replace every 15k, or as needed in dusty conditions. (Note: 00+ Only) viewtopic.php?f=45&t=13626
Evap Core Cleaning Whenever Needed (Note: 99 and older only) viewtopic.php?f=45&t=2432
Brake Fluid Flush 3yr/50k
Power Steering Fluid Replacement/Flush Every 100k or 5 years

*Special Considerations*
All Series II/III 3800's RPO's: L36, L26, L67 & L32, especially important on vehicles factory installed with orange Havoline Dexcool Antifreeze/Coolant: http://www.dex-cool.net/
Lower Intake Manifold Gasket Replacement, every 80-100k (ignorance of this can allow coolant to enter your engine oil, this happening can cause irreversible lower engine damage, requiring replacement of subject engine)

Series II, Naturally Aspirated, RPO:L36:
Upper Intake Manifold Plenum Replacement, Every 80-100k (ignorance of this can allow coolant to enter your intake manifold, possible damage to occur can be hydrolock, irreversible damage to emissions devices, misfires, etc. Most times, engine replacement is required if ignored long enough.) viewtopic.php?f=53&t=1061

Series I, II, III RPO Code L67 & L32:
Change Supercharger Oil; Every 30-50k. (Intense Racing or GM Dealer) viewtopic.php?f=56&t=1690
Supercharger Belt; Inspect Every 15k, Replace Every 100k or as needed.

5/9/2011 by 00Beast

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Bye Bye:

RIP sandrock

What do you mean under drive? Are you referring to the SC pulley?

Before changing pulleys, you need to scan for KR and make sure it has all the maintenance done on it.

Ed beat me to it only because I had to talk to my kid!

Don't even think about it until you buy a scantool or scangauge first. It goes without saying that any supercharged engine runs PREMIUM fuel only.

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Click here for mod list for both cars
93 SSEi, 95 SLE (supercharged) 97 Buick LeSabre Limited
PontiacDad at WCBF '04: Cruise control? That's like surrendering!
Comprehensive guide to troubleshooting, rebuilding, and modifying Eaton Superchargers

Thanks Bill, I was gonna ask that but I lost the thought, LOL. Premium (91 Octane or higher) is an absolute must in these cars, not like others where it is optional. The gas door says Premium Unleaded Only, not Premium Unleaded Optional.

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Bye Bye:

RIP sandrock

Underdrive pulley usually means swapping out other pulleys to reduce parasitic load on the engine, at the expense of under driving (turning slower) the alternator, water pump, etc.

That's definitely something to be done after PCM/tuning, SC pulley, intake, DP/Exhaust.

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Jason Z - Exposed Autos

2001 BMW 330i - Titanium Silver - Sport Package - 3 Pedals - Koni Yellow/H&R Sport
2006 Volkswagen GTI - (gone) Tornado Red - DSG, Stage II~280hp/325tq
1993 Pontiac Bonneville - (gone) Purple Pearl H4U/SLE. Loud

i made the mistake of buying to small of a s/c pulley. got the 3.4 from intense and should have got the 3.6. good thing its a modular one. easy to change.

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2002 Bonneville SSEI 170K



"Three men walking always has one teacher."

Also, it's technically an OVER drive pulley, since it's spinning the S/C faster.

_________________
Bye Bye:

RIP sandrock