Maggie 122 - 90mm TB gains
06-07-2009, 07:15 AM
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Maggie 122 - 90mm TB gains Hi guys,
I've recently fitted a Maggie 122 to my LS1 powered Holden Commodore with the specs being a stock LS1 bottom end, custom blower cam 224/232, .580/.590, 114.5LSA, Patriot Stage III 72cc LQ9 heads (drops cr to 9.6:1), ARP Head Bolts, stock TB, custom OTR for blower, 1 3/4" long tube headers, twin 3" cats and twin 3" exhaust.
As stated above I'm running a stock 3 bolt 78mm throttle body and I was wondering what sort of gain there would be in changing to a 4 bolt 90mm one as I have both TB adapters. If there is a big difference between the 2 throttle bodies I will look at changing to a 90mm one but if it's not worth the gain then I'll leave it as is.
I tried searching for other people's results but I couldn't seem to find anything. If I was to upgrade I was thinking of getting either an Edelbrock or Holley 90mm one as they seem to be good value for money.
Any help is greatly appreciated.
I've recently fitted a Maggie 122 to my LS1 powered Holden Commodore with the specs being a stock LS1 bottom end, custom blower cam 224/232, .580/.590, 114.5LSA, Patriot Stage III 72cc LQ9 heads (drops cr to 9.6:1), ARP Head Bolts, stock TB, custom OTR for blower, 1 3/4" long tube headers, twin 3" cats and twin 3" exhaust.
As stated above I'm running a stock 3 bolt 78mm throttle body and I was wondering what sort of gain there would be in changing to a 4 bolt 90mm one as I have both TB adapters. If there is a big difference between the 2 throttle bodies I will look at changing to a 90mm one but if it's not worth the gain then I'll leave it as is.
I tried searching for other people's results but I couldn't seem to find anything. If I was to upgrade I was thinking of getting either an Edelbrock or Holley 90mm one as they seem to be good value for money.
Any help is greatly appreciated.
06-07-2009, 09:13 AM
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Any type FI that draws through a restriction will gain power when you relieve the restriction. Draw though designs are much more sensitive to maf and tb size. If you're shooting for +450rwhp the larger TB should be worth 15-20rwhp if everything down stream is properly sized.
