maggie upgrade question
Thread Starter
Racer
Joined: Aug 2008
Posts: 367
Likes: 0
From: Sacramento ca
maggie upgrade question
I have a maggie. Cartek stage II heads and cam. Short block with lunati rods and ross forged pistons. Currently I have a smaller pulley running approx 8-10lbs of boost (looks like approx 3"). I want to increase that and had a question.
I saw at ECS the 8" crank pulley, but also noticed that some people run the 2.4" S.C. pulley. I would think it would be a lot cheaper to go to change the S.C. pulley.
My first question is would the 2.4" pulley give me a noticable amount of boost?
I am running a meth cooler, and looking into converting it to a dual spray, but the tuner that has worked on this car is a little aprehensive about more boost. I am in sacramento so the summers are pretty hot, that may be part of his concern?
I am running 9:1 compression, I may be wrong, but doesn't that allow a little more boost than say one with 105 or 11:1?
I want to be able to have a fairly reliable 550RWHP car, what do you guys think, or should I just keep it the way it is?
Thanks in advance for your thoughts, and I am sure at least one of you will say trade in the maggie
thanks
I saw at ECS the 8" crank pulley, but also noticed that some people run the 2.4" S.C. pulley. I would think it would be a lot cheaper to go to change the S.C. pulley.
My first question is would the 2.4" pulley give me a noticable amount of boost?
I am running a meth cooler, and looking into converting it to a dual spray, but the tuner that has worked on this car is a little aprehensive about more boost. I am in sacramento so the summers are pretty hot, that may be part of his concern?
I am running 9:1 compression, I may be wrong, but doesn't that allow a little more boost than say one with 105 or 11:1?
I want to be able to have a fairly reliable 550RWHP car, what do you guys think, or should I just keep it the way it is?
Thanks in advance for your thoughts, and I am sure at least one of you will say trade in the maggie
thanks
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
regardless of compression, boost is a result of resistance to airflow. The problem with the Maggies is the IAT's go up so much after 10psi boost. See the chart below. If you insist on raising the boost, the better way to go is to do the crank pulley. You decrease your surface area when you go with a smaller pulley up top. For a 2.4", you should end up having to machine the arm that holds it so it won't interfere with the pulley. If you haven't changed to 90mm throttlebody and snout, I recommend you do that. You can also spray that Maggie!
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
When you look at the above chart, notice how much more the intake temps are when going to 10psi. Beyond 10psi, they will increase exponentially. Also notice the effect that RPM has on discharge temps. A 8" crank pulley and 3" blower pulley will yield 17kRPM. Also, you need to take a look at how much power it requires to run those speeds at that amount of boost. Keep in mind your belt is holding that tension. You may want to consider an 8-rib setup as well. 
Drifting
Joined: Oct 2003
Posts: 1,923
Likes: 5
From: San Antonio TX
I'm running a shock short block with over 100k miles, the ecs overdrive crank pulley and a 2.9 on the blower.
I have no problems with IAT (runs around 140-160 here in south texas) @ 11.5# or so of boost on 64 cc heads (z06 level compression) and have put 30k miles on this setup.
IMO if your tuner cant make a forged 9:1 compression short block stand up to 12 psi (intercooled, if non-intercooled you will have a problem) maggie you need a better tuner.
I'm running straight water and water wetter in the intercooler (no antifreez) to get the best performance out of the IC. my tuner added extea fuel to cut back power due to the non-forged short block to cut the power back to 533 580 but with a forged short block that would not have been required.
More Than Zero
I have no problems with IAT (runs around 140-160 here in south texas) @ 11.5# or so of boost on 64 cc heads (z06 level compression) and have put 30k miles on this setup.
IMO if your tuner cant make a forged 9:1 compression short block stand up to 12 psi (intercooled, if non-intercooled you will have a problem) maggie you need a better tuner.
I'm running straight water and water wetter in the intercooler (no antifreez) to get the best performance out of the IC. my tuner added extea fuel to cut back power due to the non-forged short block to cut the power back to 533 580 but with a forged short block that would not have been required.
More Than Zero
Last edited by M_T_0; Dec 9, 2008 at 10:47 AM.
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Melting Slicks
Joined: Feb 2006
Posts: 2,184
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Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
Thread Starter
Racer
Joined: Aug 2008
Posts: 367
Likes: 0
From: Sacramento ca
SORRY
I should read things before I post them, I think it came out wrong
To clearify I meant an upgrade to an intercooled maggie or a larger / newer one ect. I love the way it drives!! I am just looking for a little more.
I should read things before I post them, I think it came out wrongTo clearify I meant an upgrade to an intercooled maggie or a larger / newer one ect. I love the way it drives!! I am just looking for a little more.
Instructor
Joined: Jan 2008
Posts: 179
Likes: 0
From: SF Bay Area CA
Mine was originally a non intercooled 5 psi one. Sent back to Magnuson to upgrade to intercooled. They freshened the blower and upgraded it to the intercooled 7 psi unit. Mine is at 503 rwhp after tuning from Charlie. I would think your being forged would do better numbers.
BTW, I was thinking about seriously thinking about purchasing the Vette that you have. It looks nice & I love the motor being forged. I just didn't want black. Debated back & forth & pulled the trigger on the one I have now.
BTW, I was thinking about seriously thinking about purchasing the Vette that you have. It looks nice & I love the motor being forged.
I just didn't want black. Debated back & forth & pulled the trigger on the one I have now.
Racer
Joined: Aug 2008
Posts: 344
Likes: 0
Dump the Maggie and upgrade to a ECS Novi or TTi-X already.
You're wasting your forged motor with the underperforming Maggie.
You might want to check out Andy at A&A for your tuning as well.
You're wasting your forged motor with the underperforming Maggie.
You might want to check out Andy at A&A for your tuning as well.
Last edited by motoGPguy; Dec 11, 2008 at 03:01 PM.
Thread Starter
Racer
Joined: Aug 2008
Posts: 367
Likes: 0
From: Sacramento ca
I want something streetable and I love the TQ and HP #'s at 2500 - 6500 rpm.
I like knowing my motor is built for more.
It makes me feel better than the people that have more HP out of their motor than it is designed for.
Thread Starter
Racer
Joined: Aug 2008
Posts: 367
Likes: 0
From: Sacramento ca
Everyone
Thanks for all the input! I think I am going to run a DYNO and see where I am at now, it has been a little while since that has been done.
From there I am going to fix my meth kit (probably buy a new one as this one seems to have it's issues). From everyones suggestions it seems like ECS is the way to go with that.
From there I will work with my tuner and see about the bigger crank pulley. I would like to do it, but if it required updating to an intercooled I do not know if I will do that...
Thanks for all the input! I think I am going to run a DYNO and see where I am at now, it has been a little while since that has been done.
From there I am going to fix my meth kit (probably buy a new one as this one seems to have it's issues). From everyones suggestions it seems like ECS is the way to go with that.
From there I will work with my tuner and see about the bigger crank pulley. I would like to do it, but if it required updating to an intercooled I do not know if I will do that...
Thread Starter
Racer
Joined: Aug 2008
Posts: 367
Likes: 0
From: Sacramento ca
Mine was originally a non intercooled 5 psi one. Sent back to Magnuson to upgrade to intercooled. They freshened the blower and upgraded it to the intercooled 7 psi unit. Mine is at 503 rwhp after tuning from Charlie. I would think your being forged would do better numbers.
BTW, I was thinking about seriously thinking about purchasing the Vette that you have. It looks nice & I love the motor being forged. I just didn't want black. Debated back & forth & pulled the trigger on the one I have now.
BTW, I was thinking about seriously thinking about purchasing the Vette that you have. It looks nice & I love the motor being forged.
I just didn't want black. Debated back & forth & pulled the trigger on the one I have now.I am glad you got the setup you like. With this vette I feel that the price was right, and I was bored that day so I bought it.
I do like the car, I love the fact that it is forged and a lot of CARTEK work which seems to be of pretty good quality. Between the owner in NJ and Roseville there is a lot of updated stuff (probably more than what is OE)
although you got 503rwhp I am forged I am at 9:1 compression so that would effect the HP. I will update with dyno / tune #'s. I do love the car and IMO it hauls A$$.