Pulley sizes?

[PrixieGirl69]

Hey I have a pretty much stock 1999 Pontiac Grand Prix and wanted to know if I could drop down the pulley size without crazy modifications

Mods
Ram air intake
New plugs and wires
Resonator delete

[l67ss]

Plog and tune would b a good idea

[Fivefingerdeathpunch]

IMO, you'll need more mods to drop a size safely.

Something exhaust wise.

[REDCRAPGP]

Need some exhaust work like downpipe, headers etc. It's better to have more then enough mods to drop pulleys safely then not enough mods.

[ADrugDealer]

3.8 - Stock, 91 Octane
3.6 - Plog/Headers, DP, Tune, 91 Octane
3.4 - Plog/Headers, DP, Dyno Tune, 93 Octane
3.2 - Plog/Headers, DP, Dyno Tune, Rockers/Cam, 93 Octane
3.0 - Plog/Headers, DP, Dyno Tune, Rockers/Cam, Intercooler
2.8 or Smalelr - Plog/Headers, DP, Dyno Tune, Cam, Full stack Intercooler, 93 Octane

That list should be about right and pretty safe. I ran E85 in my car so I was on a 3.2 pulley with only headers and a tune :P Now I got that snail power!

[REDCRAPGP]

You might want to mentiony that that's on a gen v and not a gen 3

[tomtom123]

http://www.grandprixforums.net/threa...ding-Your-3800!
Great read.
Downpipe, plugs, and a tune you can probably run a 3.5 or even a 3.4 as long as there is no nock. Will from Overkill told me I could probably run a 3.4" with his tune, a 180° t-stat, ZZP downpipe, and plugs as long as all other maintenance is done and there is no knock. I also have a 1999 GTP

[Slick2500]

With the mods she has currently she might be able to go with a 3.6. Remember each car is different.

[tomtom123]

With the mods she has currently she might be able to go with a 3.6. Remember each car is different.

Tis true. I have no knock on mine and its stock other than the ZZP downpipe. I am going to get an Overkill tune and drop to a 3.4" and measure for knock again. As I said, a ZZP downpipe, plugs, good tune, 180° thermostat, and no knock you can run a 3.4" as long as there is still no knock. I do agree, with her current mods I would probably not drop below a 3.6" pulley. Maybe a 3.5" with a tune and plugs.

[Slick2500]

I wouldn't go to a 3.5 without a downpipe at least, or race fuel lol.

Sent from A Galaxy Far Far Away........

[Slick2500]

But then at that point might be able to run a 3.4

Sent from A Galaxy Far Far Away........

[nascartech]

Don't drop pulley size yet do exhaust work like previous commets