Advantages/Disadvantages over 2.6???
Former Vendor
Joined: 06-03-08
Posts: 4,169
Likes: 8
From: Grand Rapids, MI
And like everyone else said...2 cars make the same HP curve...But one car has an extra 30 ftlb...that car will be faster then the other.
Quote:
Nay but you sure are starting to act like one...
I understand your concept of how you would lose 2 hp, but did you not forget the smaller pulley ADDED horsepower, more than 2.
I dont know whats up with ZZP lately, but they have been getting in ALOT of arguments, with customers and forum members abroad.
It would seem advancing would create more heat than the extra boost would anyway.
Each vendor has obviously COMPLETELY different ways of thinking... but i think the odds are against ZZP with this one...
And to answer the damn thread question, if you have the cooling mods to support, get the 2.6, if you dont... or you BEAT AND BASH on the car daily, i would stay with a 2.7
Originally Posted by Zooomer
Do you guys think I'm some newb just making crap up?
Do you guys think I'm some newb just making crap up?
I understand your concept of how you would lose 2 hp, but did you not forget the smaller pulley ADDED horsepower, more than 2.
I dont know whats up with ZZP lately, but they have been getting in ALOT of arguments, with customers and forum members abroad.
It would seem advancing would create more heat than the extra boost would anyway.
Each vendor has obviously COMPLETELY different ways of thinking... but i think the odds are against ZZP with this one...
And to answer the damn thread question, if you have the cooling mods to support, get the 2.6, if you dont... or you BEAT AND BASH on the car daily, i would stay with a 2.7
Senior Member
Joined: 10-31-06
Posts: 2,251
Likes: 0
From: O-town
All worng m62 is max mean overspin is @27psi at 16,000rpms. Ask eaton that's the max not a2.6pully that 20psi and yes u still make a lot of heat but not overspining I'm running a 2.6 with 32 of timmong with meth and my iat2 say at 82 and I don't have a dual bybass plate just meth
READ THIS:
Reducing the size of the pulley increases both response time and maximum RPM of the supercharger. The stock pulley sets the M-62 blower at maximum efficiency and reducing pulley sizes does reduce efficiency. Porting the supercharger and using supporting heat-reduction modifications can help negate these negative effects of increasing boost by using the smaller pulley. While they do help reduce the negative effects of increased IAT's, these supporting modifications can only help so much. The increased IAT's produced by using any smaller than a 2.8" pulley will most likely not be able to be reversed by these supporting modifications. It is not recommended to run pulleys smaller than 2.8; however, all cooling modifications with methanol injection may make it possible to see benefits from a 2.7 pulley. 2.5 and 2.6 pulleys bring the supercharger way past its maximum RPM range and will significantly reduce the life of the supercharger. Keep that in mind.
From eaton posted as a sticky...
Last edited by DaREDss; Jan 6, 2009 at 10:10 PM. Reason: Automerged Doublepost
Rent me! per hour
Joined: 03-22-07
Posts: 24,161
Likes: 20
From: Still fixing others mistakes.
hotcarl {nice choice in names. the chili dog is quite messy} 2.7 pulley, GMR CAMS, supertech valvespring kit, k&n intake, pacesetter header modded by me. crush bent 3 inch dp/ water/meth injection w/90-10 mix. 60lb injectors. and my tune file. 290whp.
hell i did 285whp and 250+ ft lbs on the same pulley without the gmr cams.
i crammed 23 degree's of timing and 12.3 afr down a stage 2 car tonight on the dyno. gmpp manifold, exhaust, k&n intake. still came no where near what a 2.8 car is capable of.
yes you can get 270 whp from a 3.06 pulley. i have done it. you have to push the car really ******* hard to do it.
im just flat out astounded at what im reading in this thread.
hell i did 285whp and 250+ ft lbs on the same pulley without the gmr cams.
i crammed 23 degree's of timing and 12.3 afr down a stage 2 car tonight on the dyno. gmpp manifold, exhaust, k&n intake. still came no where near what a 2.8 car is capable of.
yes you can get 270 whp from a 3.06 pulley. i have done it. you have to push the car really ******* hard to do it.
im just flat out astounded at what im reading in this thread.
Senior Member
Joined: 08-19-05
Posts: 3,018
Likes: 0
From: Horseheads, NY
How can two cars have the same HP curve but one has an "extra" 30 ft lbs? That would make the HP curve different. I think you meant "same peak HP."
To people who don't believe what someone else is saying, it may seem like the other person is acting childish. Just try looking at it from our point of view. We have already been through all of this in the 3800 market, we hold world records running Eaton superchargers, and we use high tech equipment to gather our data, and then people slapping a 2.6 pulley on their Cobalt without adequate supporting mods tell us how it feels "crazy faster" or "runs like a raped ape" or "hauls ass" so therefore we must not know what we are talking about. Unfortunately, these guys often damage their motors and there is no taking back a bad choice at that point. As zoom stated, we have nothing to gain by convincing people to run larger pulleys. When we recommend moderation in pulley choice, we are making an honest effort to look out for the community.
To people who don't believe what someone else is saying, it may seem like the other person is acting childish. Just try looking at it from our point of view. We have already been through all of this in the 3800 market, we hold world records running Eaton superchargers, and we use high tech equipment to gather our data, and then people slapping a 2.6 pulley on their Cobalt without adequate supporting mods tell us how it feels "crazy faster" or "runs like a raped ape" or "hauls ass" so therefore we must not know what we are talking about. Unfortunately, these guys often damage their motors and there is no taking back a bad choice at that point. As zoom stated, we have nothing to gain by convincing people to run larger pulleys. When we recommend moderation in pulley choice, we are making an honest effort to look out for the community.
As for the rest. Never had a 2.5 car I tuned nuke the motor...Moderation is fine...but to say its fastest or makes the most power...is a flat out lie.
Former Vendor
Joined: 06-03-08
Posts: 4,169
Likes: 8
From: Grand Rapids, MI
Without proper supporting mods, the larger pulley is often the better choice. You can not just decide that this is a lie because some cars are faster with a smaller pulley.
Senior Member
Joined: 09-17-05
Posts: 5,844
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From: Pittsburgh, PA
Why do you keep ignoring the fact of the TQ these small pullies are putting out? Bryan has brought it up twice now, and so have others. You keep ignoring it. I admit, peak HP is probably within 10 of each pullie, but who really cares about peak horsepower?
BTW, we have also destroyed blowers from small pullies. We had a car with a 2.3" on it before.
BTW, we have also destroyed blowers from small pullies. We had a car with a 2.3" on it before.
Senior Member
Joined: 10-14-06
Posts: 3,623
Likes: 1
From: Vancouver, BC
hotcarl {nice choice in names. the chili dog is quite messy} 2.7 pulley, GMR CAMS, supertech valvespring kit, k&n intake, pacesetter header modded by me. crush bent 3 inch dp/ water/meth injection w/90-10 mix. 60lb injectors. and my tune file. 290whp.
hell i did 285whp and 250+ ft lbs on the same pulley without the gmr cams.
i crammed 23 degree's of timing and 12.3 afr down a stage 2 car tonight on the dyno. gmpp manifold, exhaust, k&n intake. still came no where near what a 2.8 car is capable of.
yes you can get 270 whp from a 3.06 pulley. i have done it. you have to push the car really ******* hard to do it.
im just flat out astounded at what im reading in this thread.
hell i did 285whp and 250+ ft lbs on the same pulley without the gmr cams.
i crammed 23 degree's of timing and 12.3 afr down a stage 2 car tonight on the dyno. gmpp manifold, exhaust, k&n intake. still came no where near what a 2.8 car is capable of.
yes you can get 270 whp from a 3.06 pulley. i have done it. you have to push the car really ******* hard to do it.
im just flat out astounded at what im reading in this thread.
New Member
Joined: 12-07-08
Posts: 188
Likes: 0
From: TUCSON
im running the basically the same as you and it is around 300 i think haha let me no what kinda numbers you get when you get it dynoed im getting mine tuned and dynoed in a week or two
Senior Member
Joined: 10-11-06
Posts: 531
Likes: 0
From: Easton, PA
ok well do but im being told here that are cars well make more with a bigger rings so i guess i wasted my money on my 2.6 and supporting mod since they make more with bigger rings
Senior Member
Joined: 08-19-05
Posts: 3,018
Likes: 0
From: Horseheads, NY
And the lsj's we had with small pulleys didnt have all the supporting mods or heat management mods. We are talking full stock exhaust here with just the cat straight piped. No heat exchangers.
All that said I would go with a 2.6 under 7200 rpm, and a 2.7 at 8000rpm for blower bearing survivability. with 2.7 overall being the best overall compromise. Tho its been a while since i looked at blower speeds with pulley sizes vs rpm
But you increase power made with smaller but it takes more to power drive...so your hp really stays the same...but your tq goes up...supporting mods help to lower this power drive increase by decreasing delta pressure and help make power by cooling the charge air temps.
Last edited by djt81185; Jan 7, 2009 at 08:28 AM. Reason: Automerged Doublepost
Senior Member
Joined: 10-11-06
Posts: 531
Likes: 0
From: Easton, PA
You obviously haven't been an active member of this forum long enough... there are a couple of threads made by Ralli.
https://www.cobaltss.net/forums/drag-racing-52/not-12s-but-still-stole-5-spot-top-10-a-137472/
Last edited by USMCFieldMP; Jan 7, 2009 at 12:31 PM. Reason: Automerged Doublepost
https://www.cobaltss.net/forums/drag-racing-52/new-stock-pulley-record-pb-111286/
https://www.cobaltss.net/forums/drag-racing-52/ralliartist-track-day-101718/
https://www.cobaltss.net/forums/drag-racing-52/ralliartist-track-day-101718/
Last edited by USMCFieldMP; Jan 7, 2009 at 12:33 PM. Reason: Automerged Doublepost
Senior Member
Joined: 09-29-06
Posts: 3,110
Likes: 0
From: california
sorry but i had to chime in.. you didnt beat that M3 cause of heat soak. what happened to the vid/thread of the stage 2 balt beating an E46 M3? IT WAS BS.. you SHOULD be able to pull an M3 with that low of a pulley.. cause that 333HP that it has is BHP NOT WHP.. but you didnt.. you were right at his door cause of heat soak. and how the HELL does PSI have anything to do with MAX INSTANT RPM'S of the eaton? ive stayed door to door with an E46 M3 in a staged IRL with solid mount's cause of the mount's putting the power to the ground and making fast shifting EASY. still got beat but i was RIGHT with him. got my ASS handed to me by an M3 with the SMG transmission. dunno the mod's tho.. and IIRC the M3 does weigh jus alittle more than a balt...but has WAY better aerodynamics.