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#1 |
Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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iron intake or performer for best MPG
i have a 78 swb chevy sport van that im trying to squeeze every last MPG out of. it has a goodwrench 350 in it and i was wondering which intake yielded the best MPG. i saw a goodwrench 350 buildup on one of the chevy publications and they said that what the performer made in hp, it lost in tq. the iron intake is a pre-emission intake.
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1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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#2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: iron intake or performer for best MPG
huck said he saw a drop in 2 MPG with the performer verses stock.
I saw a noticeable increase in torque (measured in finally being able to spin a tire) and also increased MPG, 1 to 2 MPG. So it's a tough one to answer. |
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#3 |
Registered User
Join Date: Oct 2006
Location: Arizona
Posts: 835
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Re: iron intake or performer for best MPG
My bet is becuase he couldn't keep his foot out of it.
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67 Short Step, 355, 700R 4.11 posi rear, 4/6 drop Discs on all 4 corners. Build thread: http://67-72chevytrucks.com/vboard/s...d.php?t=219094 |
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#4 | |
Registered User
Join Date: Oct 2006
Location: Cheney, KS
Posts: 669
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Re: iron intake or performer for best MPG
Ita also a good 30lbs or more lighter too....less weight = motor working less to move all the weight = better gas MPG.
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: iron intake or performer for best MPG
no, huck was testing and tuning and trying everything to get that last MPG out of it. I found his discovery to be quite odd, but as far as I'm concerned, his word is gold.
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#6 |
Who's got steelies?
![]() Join Date: Feb 2006
Location: Morrison, Oklahoma
Posts: 1,026
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Re: iron intake or performer for best MPG
I don't know what performer intake you are planning to use, but I choose a Wieand Stealth mated to an Edelbrock. So far, I have been getting a very consistant 18 mpg highway. You would think that the aftermarket intakes would give better milage, because the passages are better designed, but it may be that many people are running aftermarket carbs on the new intakes, and not q-jets!
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#7 |
I have a radical idea!
Join Date: Jan 2005
Location: Sweet Home Alabama!
Posts: 6,513
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Re: iron intake or performer for best MPG
You must remember that aftermarket intakes have bigger runners which do use a little more fuel. The only way to test it would be to change just the intake. I've seen people take off iron intakes with an adapter plate for a Holley and seen an increase, but I've never seen someone leave the Q jet and and just change out intakes. I would think that with all things being the same, that the stock would be better due to the smaller runners.
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'67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 03-30-2008 at 07:04 PM. |
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#8 |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: iron intake or performer for best MPG
2X; this is one of those situations where it's very hard to do an apples-to-apples comparison.
IMHO, I'd take the intake question out of the picture, put on a decent set of headers and pay for a good tune. |
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#9 |
Alright Alright Alright
Join Date: Mar 2004
Location: Midland, Texas
Posts: 1,672
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Re: iron intake or performer for best MPG
all great info. thanks guys.
__________________
1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies |
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