Post up a dyno chart for us to see, and the good thing you are in the 500 RWHP club
Low Torque Numbers With Maggi
Thread Starter
Pro
Joined: Nov 2002
Posts: 645
Likes: 34
From: Andover KS
Low Torque Numbers With Maggi
Just installed my Maggi M112, 500 rwhp 407 torque, however I do have 11 to 1 243 z/06 port and polished LPE heads 2.02 intake, kooks headers 228/588/114 LPE cam with 40,000 miles. I had the car dyno'd by Ed Wright. I realize the conservative tune with the high cr, but I would expect my torque numbers to be higher.
I spoke to Maganson and LPE with the stock 6 lbs pulley and 11 to 1 comp ratio headers, and high flow heads they said the numbers were right. Do I have belt slip, any advice would be appreciated.
v/r
THE YAV
I spoke to Maganson and LPE with the stock 6 lbs pulley and 11 to 1 comp ratio headers, and high flow heads they said the numbers were right. Do I have belt slip, any advice would be appreciated.
v/r
THE YAV
Life Time NCM #2196
Joined: Sep 2004
Posts: 82,599
Likes: 1,717
From: Converse TX
Le Mans Master
Joined: Feb 2002
Posts: 5,970
Likes: 20
From: San Marcos Texas
Low torque for a maggie for sure. For a reference: I did an install on a stock Z06 with just headers and at 6-7psi it made 504rwhp and 480rwtq...Which is probably close to what you should have..I was at 490rwhp and 460rwtq on my stock LS1 with just a small 224 cam and headers at 7-8psi..Any kind of knock or false knock will pull timing and hurt your torque numbers..
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
My first thoughts would be HEAT SOAK and hot IAT temps along with some timing being pulled due to, either, Heat Soak or Knock Sensor pulling timing!
Usually a MAGGIE has close to the same amount of TQ as RWHP - did they watch the Voltage gauge to see if it was dropping!
If so then you will be seeing belt slip - this means when it is slipping the Alternator is not getting full spin in the uppper RPM's (I do think this is the same for the MAGGIE as is for other SuperChargers)
Thanks,Matt
Usually a MAGGIE has close to the same amount of TQ as RWHP - did they watch the Voltage gauge to see if it was dropping!
If so then you will be seeing belt slip - this means when it is slipping the Alternator is not getting full spin in the uppper RPM's (I do think this is the same for the MAGGIE as is for other SuperChargers)
Thanks,Matt
Thread Starter
Pro
Joined: Nov 2002
Posts: 645
Likes: 34
From: Andover KS
I will be able to scan the dyno sheet on Monday, I can't say heat soak the car temp never gets over 200 degrees on a 95 degree hot Kansas day. Usually runs between 186 - 196 in stop and go traffic.
What do you do for belt slip? In addition could I have a fouled plug?
As stated eareiler the dyno sheet may hold the clues.
v/r
THEYAV
What do you do for belt slip? In addition could I have a fouled plug?
As stated eareiler the dyno sheet may hold the clues.
v/r
THEYAV
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Melting Slicks
Joined: Apr 2003
Posts: 2,285
Likes: 16
From: Nashville TN
Is this always true? If so it would be a great way to check for belt slip. However it seems to me like the belt could easily slip on the supercharger pulley and not slip at the alternator. The SC has a lot more resistance than the alternator. I usually just watch the boost gauge and check for belt dust to indicate slippage.
Race Director
Joined: Apr 2009
Posts: 10,581
Likes: 252
From: SE TEX
Melting Slicks
Joined: Sep 2004
Posts: 3,178
Likes: 13
From: N. County/San Diego
I think the tune needs to be looked at.. too little or too much timing will have a huge effect as will a/f ratio!
Also...you didn`t list BOTH exhaust and intake specs of the cam so you may also be bleeding off some power/boost!
Also...you didn`t list BOTH exhaust and intake specs of the cam so you may also be bleeding off some power/boost!
Le Mans Master
Joined: Feb 2002
Posts: 5,970
Likes: 20
From: San Marcos Texas
heat soak
Thread Starter
Pro
Joined: Nov 2002
Posts: 645
Likes: 34
From: Andover KS
Thanks for all the info,
Today I hooked up a scanner....Zero spark knock, intake temps were 135-140 range, 95 degree day the car never went over 195 back down to 185. No misfires all cylinders working.
I did find a lose vacuum line near the (silver) spark controller. I had only 68 miles since the retune and the car seems to be getting stronger.
My cam specs again are .228 duration / .588 lift / 114 CL. I think that it’s a very conservative tune with the mods and cr I have about 4 LBS of boost.
I guess I will have to get some heads with 10.5 to 1 cr a retune and
smaller pulley.
I will post my dyno sheet tomorrow.
v/r
THEYAV
Today I hooked up a scanner....Zero spark knock, intake temps were 135-140 range, 95 degree day the car never went over 195 back down to 185. No misfires all cylinders working.
I did find a lose vacuum line near the (silver) spark controller. I had only 68 miles since the retune and the car seems to be getting stronger.
My cam specs again are .228 duration / .588 lift / 114 CL. I think that it’s a very conservative tune with the mods and cr I have about 4 LBS of boost.
I guess I will have to get some heads with 10.5 to 1 cr a retune and
smaller pulley.
I will post my dyno sheet tomorrow.
v/r
THEYAV
Drifting
Joined: Nov 2007
Posts: 1,616
Likes: 11
From: Newport, RI
-
Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
Just installed my Maggi M112, 500 rwhp 407 torque, however I do have 11 to 1 243 z/06 port and polished LPE heads 2.02 intake, kooks headers 228/588/114 LPE cam with 40,000 miles. I had the car dyno'd by Ed Wright. I realize the conservative tune with the high cr, but I would expect my torque numbers to be higher.
I spoke to Maganson and LPE with the stock 6 lbs pulley and 11 to 1 comp ratio headers, and high flow heads they said the numbers were right. Do I have belt slip, any advice would be appreciated.
v/r
THE YAV
I spoke to Maganson and LPE with the stock 6 lbs pulley and 11 to 1 comp ratio headers, and high flow heads they said the numbers were right. Do I have belt slip, any advice would be appreciated.
v/r
THE YAV
