Which pulley to change?

[mkorgan]

So, would expect that you can get the same end result of additional boost from the SC by changing out either the crank pulley or the SC drive pulley. Since the SC drive pulley seems to be much easier to access, is there a specific benefit to changing the crank pulley? If I go with the 2.50" SC drive pulley, am I doing something that limits my options with future mods? Thanks for the help.

[avcbm]

I’m wondering the same thing… should I go with the crank pulley no tune option, or go with a tune and supercharger pulley upgrade… or do a combination of both… I don’t want an insane increase in HP, but would like to get to 600 rwhp which will be the safest in the long run, because 15 years from now I still want to be driving my ZL1…

[s/c ss]

Originally Posted by avcbm

I’m wondering the same thing… should I go with the crank pulley no tune option, or go with a tune and supercharger pulley upgrade… or do a combination of both… I don’t want an insane increase in HP, but would like to get to 600 rwhp which will be the safest in the long run, because 15 years from now I still want to be driving my ZL1…

I'm with you. I'm planning on keep the car but would really like to put a bit more HP to back up the car. Not that I'll ever use it all but just knowing it's there.....

[DangerZL1]

Originally Posted by mkorgan

So, would expect that you can get the same end result of additional boost from the SC by changing out either the crank pulley or the SC drive pulley. Since the SC drive pulley seems to be much easier to access, is there a specific benefit to changing the crank pulley? If I go with the 2.50" SC drive pulley, am I doing something that limits my options with future mods? Thanks for the help.

It's more difficult to change the drive pulley and hub on the ZL1 due to the challenge of removing the supercharger or lifting the front to get the snout off. It is the cheaper option in cost. The crank pulley is easier to change for the average mechanic and once swapped offers more options for the amount of overdrive. It costs more than twice as much in parts. There are some posts that using one or two sizes up from stock doesn't require a tune. This is also an advantage for many owners, since the drive pulley requires a tune.

[mkorgan]

Originally Posted by DangerZL1

It's more difficult to change the drive pulley and hub on the ZL1 due to the challenge of removing the supercharger or lifting the front to get the snout off.

The pulley coming off of the SC seems to be easily accessible. It there something I am missing? Can you point me to any DIY pic's that show why the SC itself needs to be loosened? Also, to get to the crank pulley, I would have to drop the pan under the car, correct? I am sorry to ask stupid questions but this is going to be a weekend project for me and I would like to know exactly what I am getting in to depending on which pulley I decide to swap.

Another question, at what boost would it be recommended to put a larger heat exchanger on the car?

Thanks again for everyone's input.

[SlugWound]

Originally Posted by mkorgan

The pulley coming off of the SC seems to be easily accessible. It there something I am missing? Can you point me to any DIY pic's that show why the SC itself needs to be loosened? Also, to get to the crank pulley, I would have to drop the pan under the car, correct? I am sorry to ask stupid questions but this is going to be a weekend project for me and I would like to know exactly what I am getting in to depending on which pulley I decide to swap.

Another question, at what boost would it be recommended to put a larger heat exchanger on the car?

Thanks again for everyone's input.

I have heard its much easier to change the crank pully as mentioned above, if you do a search there are alot of threads that discuss this specific topic.

[BonestockZL1]

I am leaning more towards the SC pulley swap instead of the crank balancer and pulley swap. I had my ZL1 on the dyno this morning and I asked the the guy which swap would be better. He strongly recommended the SC pulley. Mainly because the crank pulley would make the alternator run slower and the water pump. With the heat soak these cars have he said it would not be a good idea to turn the water pump any slower.

I would also like to know about a DIY SC pulley swap as well.

[The Baron]

The stock pulley is held on by the nuclear force of the center of the galaxy.. they are a BITCH to get off.. need the right puller..

[mkorgan]

Originally Posted by The Baron

The stock pulley is held on by the nuclear force of the center of the galaxy.. they are a BITCH to get off.. need the right puller..

Okay, so that must be the answer. The SC pulley is pressed on I take it. Yeah, that changes things for sure.

[Bcruse84]

Originally Posted by BonestockZL1

I am leaning more towards the SC pulley swap instead of the crank balancer and pulley swap. I had my ZL1 on the dyno this morning and I asked the the guy which swap would be better. He strongly recommended the SC pulley. Mainly because the crank pulley would make the alternator run slower and the water pump. With the heat soak these cars have he said it would not be a good idea to turn the water pump any slower.

I would also like to know about a DIY SC pulley swap as well.

The crank pulley I got didn't under drive the accessories. It only allows you to change the supercharger drive pulley and keeps everything else to stock specs. The advantage to changing the crank pulley is its much lighter than stock and easy to change. Took me about 2hrs the first time.

Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

[BonestockZL1]

Originally Posted by Bcruse84

The crank pulley I got didn't under drive the accessories. It only allows you to change the supercharger drive pulley and keeps everything else to stock specs. The advantage to changing the crank pulley is its much lighter than stock and easy to change. Took me about 2hrs the first time.

Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

Which pulley did you go with?

[Blown355]

Originally Posted by BonestockZL1

I am leaning more towards the SC pulley swap instead of the crank balancer and pulley swap. I had my ZL1 on the dyno this morning and I asked the the guy which swap would be better. He strongly recommended the SC pulley. Mainly because the crank pulley would make the alternator run slower and the water pump. With the heat soak these cars have he said it would not be a good idea to turn the water pump any slower.

I would also like to know about a DIY SC pulley swap as well.

The only pulley that changes size is the one driving the supercharger. All the other pulleys remain the same size. A pulley swap how-to has been posted, do a search.

[CanadianZL1#992]

Originally Posted by mkorgan

The pulley coming off of the SC seems to be easily accessible. It there something I am missing? Can you point me to any DIY pic's that show why the SC itself needs to be loosened? Also, to get to the crank pulley, I would have to drop the pan under the car, correct? I am sorry to ask stupid questions but this is going to be a weekend project for me and I would like to know exactly what I am getting in to depending on which pulley I decide to swap.

Another question, at what boost would it be recommended to put a larger heat exchanger on the car?

Thanks again for everyone's input.

The car could use a bigger HX right from factory and there'd be no problem with heat soak. I've got cooler logic's HX, it's about 3 times factory. Also installed roto fabs reservoir for more intercooler coolant capacity

[Nemisis]

Another benefit to the crank pulley is you can easily swap out the front of the crank pulley and go to a different size, 6 Allen head bolts and you're done.