Is it safe to put a Smaller pulley on trd s/c?

[solara blues]

Just installed the s/c on my 00 solara 5speed, and already want more! Does anybody know the dangers of giving more pressure from smaller pulley? How much pressure is "safe" without changing injectors and etc?
Please Help, I dont want to hurt the engine.

[hari-bhari]

please read the announcement and post in the correct section. however, i think the consensus was the safest level of boost is 5.5 psi without doing any other mods.

[lildk50]

hey, i heard that 2.75" or 2.6" pulley's are safe...anything below is dangerous. Of course, i read this on a website so don't quote me.

[Yanks0114]

Taken directly from the FAQ that I spent so much time on and no one seems to read:

Whats the smallest pulley I can use on my supercharger and still be safe?

First off,a warning, any changing of the pulley will void your supercharger warranty and no one has done as much testing as TRD which is why the 4psi is recommended. If you do want to upgrade it is recommended that you go no higher than 5.5-6PSI. Of course people are running higher, but with stock internals 5.5PSI (2.9") is reguarded as safe.
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Why can't I run more than 6lbs of boost?

Of course you can run more than 6lbs of boost, but its not recommended. The 1MZ-FE engine has a very high compression ratio (10.5-1). The addition of 5.5Lbs boost puts the internal pressure of the engine at roughly 14PSI. Normal atmoshperic pressure is 14.7PSI at sea level. If there was more pressure inside the engine than outside, excess stress would be put on the entire engine, especially the seals. If you are going to run high boost (>4PSI) it is highly reccomended that you get a S-AFC and have your car dyno-tuned

[cdssolara]

Yanks' info is correct. Anything over the stock 4 psi is a risk. I had a 5.5 psi pulley on my car, and even though I was dynotuned with S-AFC and had a catback exhaust, I had problems with one of my knock sensors. Of course, part of the problem was that our Premium gas here in California is 91 octane. There's less of a risk of detonation with higher octane gas. I ended up getting new cylinder heads to reduce compression to around 9.3:1, and am now able to safely run 7 psi of boost.