Stacked Pulleys..
Senior Member
Joined: Oct 2004
Posts: 471
Likes: 33
From: Germany
SL65 R230
203mm:74mm = 2,74. 178mm:65mm =2,74. The 185mm LET has 2,5 ratio.
Like the others say, it would be too much and on the Autobahn it would create to much heat when you are boosting for longer periods. Don't risk your engine...
Member
Joined: Jul 2006
Posts: 154
Likes: 0
From: Melbourne
C32 AMG
anyone thought of machining down code 3 pulley?
i did the research and this is what i came up with
C3P pulley 65.8mm
63.6mm to equal the boost of 178mm Crank Pulley running @ 6,200 Engine RPM
62.5mm to equal the boost of 181mm Crank Pulley running @ 6,200 Engine RPM
61.2mm to equal the boost of 185mm Crank Pulley running @ 6,200 Engine RPM
so maybe a machined down s/c pulley to 60mm would to the trick
Stock Crank Pulley : 74mm S/C - - Ratio = 2.0270
Engine RPM @ 6,000 - - S/C RPM = 12,405 ~ 14.5 psi
though belt slip will get even worse with smaller pulley
i did the research and this is what i came up with
C3P pulley 65.8mm
63.6mm to equal the boost of 178mm Crank Pulley running @ 6,200 Engine RPM
62.5mm to equal the boost of 181mm Crank Pulley running @ 6,200 Engine RPM
61.2mm to equal the boost of 185mm Crank Pulley running @ 6,200 Engine RPM
so maybe a machined down s/c pulley to 60mm would to the trick
Stock Crank Pulley : 74mm S/C - - Ratio = 2.0270
Engine RPM @ 6,000 - - S/C RPM = 12,405 ~ 14.5 psi
though belt slip will get even worse with smaller pulley
Super Member
Joined: Jul 2006
Posts: 691
Likes: 0
From: FT POLK LOUISIANA
1992 Toyota Corolla, 1994 Chevy C1500, 2002 C32, 2012 Prius, 2013 Toyota Sienna
A 203 mm pulley 
that would be awesome if it could work. But I could see my engine blowing up doing 160 in the left lane which is the norm for me. No thanks, I think 185mm is in my future, Thanks all.
that would be awesome if it could work. But I could see my engine blowing up doing 160 in the left lane which is the norm for me. No thanks, I think 185mm is in my future, Thanks all.From my Calculation a 203mm !! Crank-Pulley would have the same ratio...
203mm:74mm = 2,74. 178mm:65mm =2,74. The 185mm LET has 2,5 ratio.
Like the others say, it would be too much and on the Autobahn it would create to much heat when you are boosting for longer periods. Don't risk your engine...
203mm:74mm = 2,74. 178mm:65mm =2,74. The 185mm LET has 2,5 ratio.
Like the others say, it would be too much and on the Autobahn it would create to much heat when you are boosting for longer periods. Don't risk your engine...
SPONSOR
Joined: Jul 2007
Posts: 5,459
Likes: 152
From: Houston/ Austin /Toronto / UAE / Minneapolis / Orlando /Cincinnati
Eurocharged Performance ML63 and TT lambo
Biggest crank that can go on our car is a 192. But even that requires some pre-mods to get to work correctly.
Last edited by loungn14; Dec 14, 2008 at 06:11 PM.
Super Member
Joined: Dec 2007
Posts: 557
Likes: 0
From: Surprise, AZ
2005 Crossfire SRT6
No one has stacked pulleys with an InMotion tune. That may be what someone needs to try. So far it's the tune that can't be figured out. The injectors and fuel map have been blamed but MDSRT6 has put a monstrous shot of nitrous with his 181 pulley to run 10.70's all with an InMotion tune and never ran out of fuel and his A/F ratio's never approached the crazy levels of 17 AFR's like some were at. If you don't like nitrous, ok his best was 11.5 on all motor again with the same tune, he just adjust the plugs when not running nitrous. No fuel loss problems.
Member
Joined: Jan 2008
Posts: 233
Likes: 0
From: South Jersey
2002 C32 AMG
No one has stacked pulleys with an InMotion tune. That may be what someone needs to try. So far it's the tune that can't be figured out. The injectors and fuel map have been blamed but MDSRT6 has put a monstrous shot of nitrous with his 181 pulley to run 10.70's all with an InMotion tune and never ran out of fuel and his A/F ratio's never approached the crazy levels of 17 AFR's like some were at. If you don't like nitrous, ok his best was 11.5 on all motor again with the same tune, he just adjust the plugs when not running nitrous. No fuel loss problems.
B.T.W. your 12.02 is an awesome time without even having the manifolds yet.
What's your trap speed?
Last edited by Eleventeen; Dec 14, 2008 at 12:31 PM.
Super Member
Joined: Dec 2007
Posts: 557
Likes: 0
From: Surprise, AZ
2005 Crossfire SRT6
115.8 almost 116mph. I should get them back all finished next week. I had some killer weather the day I ran the 12.02. I've only had a couple of days that were close in comparison DA wise, but only managed a 12.03. So hopefully this winter I can get my 11's without having to go to another track. Corrected DA would be well into the 11's. It was around 2700' the day I ran the 12.02. I'm looking forward to getting them on. I did some testing with the unfinished version of them and ran 12.0's all day long in worst DA. The car seemed to run alot easier, didn't even feel like it was working hard and still managed those numbers. All while maintaining AFR's in the 11-12's under full load. If I would go lean on my tune I would already be in the 11's. Since I bracket race alot, I wanted a very conservative tune with the best results. I'll break an axle before my motor even get's a bandaid.
Member
Joined: Jan 2008
Posts: 233
Likes: 0
From: South Jersey
2002 C32 AMG
Those are great trap speeds
I've had my eye on those manifolds ever since I found the thread NEEDSWINGS posted about them; I knew they would add power. Unfortunately, I've recently spent too much money on the car between having to replace my intercooler and other maintenance costs, so I cannot afford them right now
. It seems like people are having great success with these manifolds, and if I could drop a couple tenths like everyone else is, I would be hauling ***!
I've had my eye on those manifolds ever since I found the thread NEEDSWINGS posted about them; I knew they would add power. Unfortunately, I've recently spent too much money on the car between having to replace my intercooler and other maintenance costs, so I cannot afford them right now. It seems like people are having great success with these manifolds, and if I could drop a couple tenths like everyone else is, I would be hauling ***!
Last edited by Eleventeen; Dec 14, 2008 at 02:33 PM.
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Super Member
Joined: Dec 2007
Posts: 557
Likes: 0
From: Surprise, AZ
2005 Crossfire SRT6
In a month or two I will have some real world data I'll let you know how much boost I'm putting out with them. Also where AFR's remain or change with them. Just from the short time I was testing with them they felt like the same power with less boost. Unfortunately my quest for 11's is just for the number. I'll have to slow my car down for the class I run in. In the sportsman class I compete in it's a 12.00 and up class. Under that and I get dq'd. So 12.0's is smoking for that class. We shall see.
