Maggie with smaller pulley!
Thread Starter
Le Mans Master
Joined: Mar 2006
Posts: 7,838
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From: Valencia '32 Ford 3 window with 615 HP!!!!
St. Jude Donor '06-'09
Maggie with smaller pulley!
I have a Magnacharger and was wondering if anybody's put a smaller pulley on thier vette with a magnacharger!
If so,how were the results!
Thanks,George
If so,how were the results!
Thanks,George
Pro
Joined: Jun 2006
Posts: 589
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From: Cincinnati OH
George, you are a man possessed! 
Can't wait to see how that car turns out with everything you've got lined up.
I've heard the C5 guys running Maggies have had decent results with a smaller pulley. If there's nothing here, you might poke around the C5 area.
Can't wait to see how that car turns out with everything you've got lined up.I've heard the C5 guys running Maggies have had decent results with a smaller pulley. If there's nothing here, you might poke around the C5 area.
Pro
Joined: Jun 2006
Posts: 589
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From: Cincinnati OH
George, looks like a member named FunCool has run a few pulley combinations on his C5 Maggie. Here's a thread for reference.
Good luck.
http://forums.corvetteforum.com/show...uson+pulley+c5
Good luck.
http://forums.corvetteforum.com/show...uson+pulley+c5
Drifting
Joined: May 2005
Posts: 1,254
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From: Ft. Liquordale Florida
I did a few pulley swaps to get where I wanted to be. Maggie apparantly did not hear (or take into account) that we were going to 70cc heads to lower compression so we could run more boost. Stock 3.4 pulley only gave us 4lbs of boost with my setup. 3.2 pulley (smallest one you can fit) only gave us 6-7lbs Had to send the blower back to maggie for a rear pulley swap - which required machining of the nosecone and fuel rail to clear the replacement pulleys. With a 3.2 pulley, I was getting 14lbs of boost - a little too much for my comfort on a stock bottom end - plus concerns about higher IAT's had me go back to the 3.4 pulley for 10lbs of boost.
Swapping to a 3.2 should put you around 9-10lbs, but do retune as that much more air is going to throw you way lean. With an additional 3lbs you should see another 30-50HP.
Rick
Swapping to a 3.2 should put you around 9-10lbs, but do retune as that much more air is going to throw you way lean. With an additional 3lbs you should see another 30-50HP.
Rick
Thread Starter
Le Mans Master
Joined: Mar 2006
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From: Valencia '32 Ford 3 window with 615 HP!!!!
St. Jude Donor '06-'09
Originally Posted by SSJCreeper
George, you are a man possessed! Can't wait to see how that car turns out with everything you've got lined up.
I've heard the C5 guys running Maggies have had decent results with a smaller pulley. If there's nothing here, you might poke around the C5 area.
Can't wait to see how that car turns out with everything you've got lined up.I've heard the C5 guys running Maggies have had decent results with a smaller pulley. If there's nothing here, you might poke around the C5 area.
Please send some help my way!
George
Race Director
Joined: Dec 1999
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From: Westport, MA. www.tbyrnemotorsports.com - 1-877-4-TBYRNE
St. Jude Donor '06-'07
I'm running a 3.2" on mine now. Not that the car needed to be woken up but it really woke it up I need to take care of the tuning so I've only run it up to about 3500 RPMs. Much more responsive in the lower RPMs.
I need to take care of the tuning so I've only run it up to about 3500 RPMs. Much more responsive in the lower RPMs.
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From: Westport, MA. www.tbyrnemotorsports.com - 1-877-4-TBYRNE
St. Jude Donor '06-'07
My car is an M6. A 3 prong pulley puller will easily remove the pulley from the shaft. Just be careful so you don't lose the "key" that keeps the pulley from spinning on there. I'm going to measure the boost before or when the car goes on the dyno but I don't have a gauge in the car. I don't want it to look like a race car
I'm expecting it to be at about 7psi with the long tubes I'm running.
I'm expecting it to be at about 7psi with the long tubes I'm running.
Drifting
Joined: May 2005
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From: Ft. Liquordale Florida
Originally Posted by SpinMonster
Exhaust affects boost amount?
tbyrne - I know you don't want to look like a race car - but you'd be well advised to get at least FP and boost gauges - or you won't have a clue in diagnosing any possible issues. You also want an FP gauge, as the Magnavolts have a tendancy to get weird (I just lost my 2nd one). With a smaller pulley, you're treading into somewhat dangerous territory, and gauges can be an invaluable indication of your cars health.
Watch out for your cats, ESPECIALLY with a smaller pulley. My Supermaxx cats clogged at about 4K mi after installation. Dynatech says that even the hi-flo's will clog with spray or FI - and the only way I diagnosed it was with the BOOST GAUGE (aside from the car running like a$$). The backpressure from the clogged cats made my boost go up to 16lbs. Blowing your rings into your oil pan, or taking out a head gasket is not out of the question in that scenario.
Pro
Joined: Jun 2006
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From: Cincinnati OH
Originally Posted by SickRick
Watch out for your cats, ESPECIALLY with a smaller pulley. My Supermaxx cats clogged at about 4K mi after installation. Dynatech says that even the hi-flo's will clog with spray or FI - and the only way I diagnosed it was with the BOOST GAUGE (aside from the car running like a$$). The backpressure from the clogged cats made my boost go up to 16lbs. Blowing your rings into your oil pan, or taking out a head gasket is not out of the question in that scenario.
Boy, a smaller pulley sounds interesting... is there a significant increased risk for engine degradation with a smaller pulley? ... or is it still relatively 'safe' (provided it's tuned properly)?
Thx
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From: Westport, MA. www.tbyrnemotorsports.com - 1-877-4-TBYRNE
St. Jude Donor '06-'07
Oh yeah, I know that I might not have them in there all the time but can connect them pretty quick. As you said, those gauges can come in handy when diagnosing problems. My MV checked out a couple of weeks ago. You can jump the grey/yellow wires in the harness if that happens. Just don't run it hard with the MV by-passesd.
I might not have them in there all the time but can connect them pretty quick. As you said, those gauges can come in handy when diagnosing problems. My MV checked out a couple of weeks ago. You can jump the grey/yellow wires in the harness if that happens. Just don't run it hard with the MV by-passesd.
Race Director
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From: Westport, MA. www.tbyrnemotorsports.com - 1-877-4-TBYRNE
St. Jude Donor '06-'07
Probably need someone that has blown their motor to chime in. I've heard of people running 10psi through an LS2 motor and it's still together. I'd figure 5-6psi to be safe, 7-8 can be safe with a good tune, 9-10 can run good but for how long? 11+? Get ready to open the piggy bank! There are other things that can be involved bthat gives you an idea.
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Joined: Aug 2005
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From: Hudson WI
NCM Sinkhole Donor
Originally Posted by tbyrne
Probably need someone that has blown their motor to chime in. I've heard of people running 10psi through an LS2 motor and it's still together. I'd figure 5-6psi to be safe, 7-8 can be safe with a good tune, 9-10 can run good but for how long? 11+? Get ready to open the piggy bank! There are other things that can be involved bthat gives you an idea.
I talk to guys that buy Roush Mustangs and want to put a smaller pulley on and the part they forget is that the Ford engines that come from the factory with blowers have a steel block and other goodies to live with the blower and the Roush, Saleens, etc don't, so boost becomes your enemy.
Drifting
Joined: May 2005
Posts: 1,254
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From: Ft. Liquordale Florida
7 is really the recommended boost for stock bottoms. There's a number of folks running prochargers with higher boost, but they're not peaking all the time (like the maggie). No one here has reported smoking a motor yet, but it's still pretty new stuff for the LS2's. I heard of a GTO that missed a shift and lunched his motor. Read something like 8,700 RPM from his ECU. But you can do that without a blower.
As mentioned earlier, I decided to run bigger heads to use more boost. It was a BEAR to tune correctly, and the dyno charts don't like like your typical maggie (HP/TQ climb, rather than go straight up).
The power I'm running can get pretty unmanagable on street tires. The Bridgestone RE050A's I'm running on (305X30) handle the power pretty well, but dropping the clutch from a standstill, you can spin all the way thru the 2-3 shift.
As mentioned earlier, I decided to run bigger heads to use more boost. It was a BEAR to tune correctly, and the dyno charts don't like like your typical maggie (HP/TQ climb, rather than go straight up).
The power I'm running can get pretty unmanagable on street tires. The Bridgestone RE050A's I'm running on (305X30) handle the power pretty well, but dropping the clutch from a standstill, you can spin all the way thru the 2-3 shift.
