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97 l32 camaro

Pulley size has no measurable effect on gas mileage aside from someone that is wide open alot.

I will take newer, extremely insignificantly larger valves any day!
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Without larger ports in the head, the larger valves are technically a restriction, albeit a extremely small one. Either way they are not helping.
 


darkhorizon said:
Pulley size has no measurable effect on gas mileage aside from someone that is wide open alot.



Without larger ports in the head, the larger valves are technically a restriction, albeit a extremely small one. Either way they are not helping.
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so my heads suck for what i want? and also wouldn't a smaller pulley be more of a drag on the motor while daily driving or is it barely noticeable? here in miami the ac doesn't stop. i also would like to thank everyone for there help and advice. thanks allot guys im new to these engines but if you need help with lt1s let me know i know them from car to car year to year.
 
you're splitting hairs lol. there's practically no difference in the heads, nothing noticable anyways. a smaller pulley shouldn't have any effect on gas milage unless you use the boost. it changes the amount of rotations made by the screws in the supercharger, and effectively makes them spin faster, but i don't think it makes the engine work any harder. any change in gas milage would be negligible with some conservative driving
 
Poil336 said:
it changes the amount of rotations made by the screws in the supercharger, and effectively makes them spin faster, but i don't think it makes the engine work any harder.
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essentially the blower becomes more and more of a drag on the motor the smaller the pulley you run. roots blowers rob horsepower to make horsepower. that is why at some point someone will mention 'diminishing gains', which is usually in the 2.8" pulley area. some like to be awesome and run the smallest pulley they can while others go for other ways of making more power (timing, different blower or a turbo, etc).

so yes, it does put extra load on the motor the smaller pulley you have. however, when youre cruising the BBV is open and the blow is essentially not there so it's not a concern. this theory is only relevant under boost.
 
Bio248 said:
essentially the blower becomes more and more of a drag on the motor the smaller the pulley you run. roots blowers rob horsepower to make horsepower. that is why at some point someone will mention 'diminishing gains', which is usually in the 2.8" pulley area. some like to be awesome and run the smallest pulley they can while others go for other ways of making more power (timing, different blower or a turbo, etc).
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Blower speed has little to nothing to do with the power consumption, at least it is not measurable by most any of the tools one would have in a normal performance shop. The pressure ratio across the blower is where the measurable power consumption is coming from.

M90power.gif


The extra 500rpms you get out of a smaller pulley results in an extra 1 or 2 hp drag, but an extra 5psi results in 20hp added on top.

so yes, it does put extra load on the motor the smaller pulley you have. however, when youre cruising the BBV is open and the blow is essentially not there so it's not a concern. this theory is only relevant under boost.
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BBV does not "prevent boost" from happening, it is just changing the dynamics of airflow through the blower.
 


The more boost you run the more power it uses.

The faster it spins, the more power it uses.

Try to keep it at 13 PSI and lower and you should be good.

Anything below a 3.0 pulley and you should be considering a different power adder.
 
so will i be able to just run a 3.8 when daily driving and then go down to a 3.0 when it comes time to run it? and about how much boost does a 3.0 pulley make on a l32?
 
97RS said:
so will i be able to just run a 3.8 when daily driving and then go down to a 3.0 when it comes time to run it? and about how much boost does a 3.0 pulley make on a l32?
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Nooooooooo...

You need supporting mods...3.0" pulley is intercooler, injectors, cam territory. I'd say if that thing had headers on it you should be able to get away with a 3.4" pulley on pump gas with a good tune.
 


im planing on running stage 2 intercooler and i have a CAI, headers with a high flow y pipe, catalytic, and muffler. supposely a 3.1 is the lowest i can go without injectors. i got 2 weeks before i start ordering stuff so everyone's advice could help me now thanksss.
 
Honestly if that is the case...I'd spring for the bigger 42.5lb. injectors and run sub 3.0" pulley sizes...did you cam it by chance? If not...or if you don't plan on doing anything crazy...1.95 Roller Rockers or a VS Cam would be a great choice...since your there already...all you'd need are stronger springs/retainers...and IMO, I'd get a new timing chain and tensioner no matter what just so you don't ever have to mess with that again.
 
It does...but honestly if you want to take advantage of the full power gains in the VS or 1.95's...you'll run it up to 6K or so...and stock springs ain't cutting it ANYWHERE past stock shift points.
 


bluegtp91 said:
It does...but honestly if you want to take advantage of the full power gains in the VS or 1.95's...you'll run it up to 6K or so...and stock springs ain't cutting it ANYWHERE past stock shift points.
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Ehh, revving high on rockers never really did anyone that much good, at least with boost.
 
no cam just a stock l32 with 20k miles off a 06 GTP, i really would hate to cam it since the motors in the car and rockers would also be a ***** to do buts its doable when i install the intercooler. im really looking to get the most mpg while dailying and the most power when at the track. i know power and fuel millage don't go together. since im not familiar at all with these engine and how they respond from the looks of it u think 1.9 rollers rockers, good springs and intercooler and a 3.1 pulley would be a good set up? or are the rockers going to help me much or should i just invest that money in 42.5 lb injectors and go lower on boost? i have headers and a CAI already.
 
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97rs thanks for giving me hope :cool:

i recently bought a 97 camaro 3.8 and first thought was to put a m90 on it and yet everything has been telling me that its not possible even though i figured with a little bit of fab work it should be. did a google search and came across this.

due to every one telling me its impossible to put an m90 into a 97 camaro just makes me want to do it even more and it would be fun to roll around in somthing diff at the local fbody meets to kinda screw with some of the members minds that claim it can't be done.
 
maro said:
97rs thanks for giving me hope :cool:

i recently bought a 97 camaro 3.8 and first thought was to put a m90 on it and yet everything has been telling me that its not possible even though i figured with a little bit of fab work it should be. did a google search and came across this.

due to every one telling me its impossible to put an m90 into a 97 camaro just makes me want to do it even more and it would be fun to roll around in somthing diff at the local fbody meets to kinda screw with some of the members minds that claim it can't be done.
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man im sorry to tell you buts it not easy to do and it really takes a **** load of work and if u never put an fbody together from the frame up your going to be stuck. one thing i did was lower the engine k member 2 inches to make space for the intercooler when i order it and even after that i have to do a little more fabbing. if your in it for speed go turbo, if ur in it to say u have a supercharged camaro wait about a month and i'll be doing a write up.
 
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