ok, now i must rant. I preach and preach about pulley's because i don't understand why everyone thinks putting on a smaller pulley is going to unleash a huge amount of hp.Originally Posted by DnaProdigy
Do any of you understand WHY we put smaller pulley's on our cars? With some of the answers i've seen here i'm assuming you don't. When you put mods such as... intake, headers, rockers, plugs, on our cars it makes our engine's more efficient. Moving air through the motor more efficiently while the blower is still spinning at stock speed will cause boost loss. The exact same amount of air is still getting rammed through the motor but now it's being done so easily there is an on average loss of about 3-5psi depending on numerous things. Then we put on the appropriate pulley to spin the blower fast enough to get about stock boost maybe a little more. If you spin the blower to fast you'll start boost stacking and without an i/c you're asking for trouble.
Why? Well the m90 isn't very efficient since it pressurizes the intake charge in the intake manifold and puts out A LOT of heat. Running a pulley to small for the supporting mods is going to cause the car to boost stack, and that causes a lot of heat, which in turns leads to detonation. I know all of you guys get all your information from all the vendors and that's what they say is needed to run a 3.4 pulley. Yea, they are right, that's the minimal needed to run a 3.4 pulley. Are you going to get kr? Yep. Another thing that ticks me off is people that think its ok to have 1-4* of kr... why would that be ok? Because everyone else has it? Everyone else has it because everyone else is running a 3.4 pulley with intake, dp, plog, plugs, and a pcm. I guarantee 8-10 cars running a 3.4 pulley with those mods gets kr, which does nothing but slow the car down. Timing in these cars is everything, hence why everyone with comparable mods that i have is running mid 13's and slower.
Another reason why having your own tuner is a must, so you can tune YOUR car, and not let someone else guess what you need. mail order pcms are a waste of money imo. I'd rather save the 400 more dollars and do that **** myself. I'm acquiring another gtp soon and it's going to remain completely stock and i'm going to prove that i can take a stock gtp further than most of the 3.4 pulley guys have taken their setups. If you are running a correct 3.4 pulley setup you'll be mid 13's all day long, IF CORRECTLY DONE. I ran a 13.2@105 on a 3.4 pulley correctly tuned with absolutely no kr on 85* day. I use myself as an example because it seems like i'm the only one that understands what pulley's are for.... Boost doesn't make power without an i/c!!!
FUEL>SPARK>BOOST in that order. First you get your fuel right, then you run the correct amount of timing, all with no kr, then and only then to do you run a smaller pulley.
So to answer this question, there is no way that anyone can tell you what size pulley you can run. The only way to know is to scan your car and find out for yourself. I'll be willing to bet you have kr right now at the end of a 3rd gear pull on said mods and a stock pulley.
Take it as it is, but i'm sick and tired of seeing 3.4 cars running high 13's and still trapping in the double digits. Those same cars would probably be faster on a stock pulley and when i acquire another gtp soon i will prove a stock one correctly tuned is faster than the vendors "safe" 3.4 setups. Sorry again for the rant.
