408ci Gas Mileage???
11-07-2005, 09:34 PM
#1
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408ci Gas Mileage??? Hey guys, I'm on the fence about forging my internals + super charger + spray and just getting a 408 + spray. I'm hoping for around 500 HP without the nitrous and 800+ with nitrous. What'll really make me choose between the two setups is gas mileage. So, those of you who have 408s, or have friends with 408s, how's the mileage?
Thanks!
-somebody
Thanks!
-somebody
11-07-2005, 09:50 PM
#2
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I get about 13 average, about 75% in town. That's with driving fairly easy. I've seen as high as 22mpg cruising at 65-70mph. And as low as 9mpg when doing only very short trips at a time. At a constant 110mph for about 1 1/2 hours I got 16mpg. I think the spray option will get you better mileage.
11-07-2005, 10:47 PM
#3
If mileage is as important as power, go with a forged 346 and put a turbo on it. Out of boost, your mileage will rival a naturally aspirated 346 as the turbo doesn't have the parasitic losses (mileage sapping drag) of a supercharger. A hair dryer or two can easily get you over 800 rwhp with a forged 346.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
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2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
11-09-2005, 09:43 AM
#7
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Who cares??
If gas consumption is an issue, do not mod, sell the V8 and get a tiny 4 banger.
You want power? Then a simple rule is "when it is empty, fill it up !!"
But Patrick G is right. Hair drier motor, intercooled has shown best fuel efficiency for power produced.
If gas consumption is an issue, do not mod, sell the V8 and get a tiny 4 banger.
You want power? Then a simple rule is "when it is empty, fill it up !!"
But Patrick G is right. Hair drier motor, intercooled has shown best fuel efficiency for power produced.
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11-09-2005, 11:40 AM
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Originally Posted by PREDATOR-Z
Who cares??
If gas consumption is an issue, do not mod, sell the V8 and get a tiny 4 banger.
If gas consumption is an issue, do not mod, sell the V8 and get a tiny 4 banger.
I'm just not sure I want to get something that could have possibly only yeilded me 5-10 highway mpg. Cruising would be pointless and annoying if I have to fill up every half an hour. 
Not everyone wants a track-only car. I can't live my life a quarter mile at a time! [/Vin Diesel]Thanks everyone else for your replies. I may just get that Lunati 347 kit.
-somebody
11-09-2005, 12:14 PM
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Originally Posted by Patrick G
If mileage is as important as power, go with a forged 346 and put a turbo on it. Out of boost, your mileage will rival a naturally aspirated 346 as the turbo doesn't have the parasitic losses (mileage sapping drag) of a supercharger. A hair dryer or two can easily get you over 800 rwhp with a forged 346.
you are clearly dropping BIG bucks on this engine. why wear it out on in traffic on the way to work.
$5000 for a nice civic to and from work will spare this engine, gas milage and a slew of headaches.
11-09-2005, 12:29 PM
#10
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Originally Posted by Somebody09
Obviously I care. I made the post did I not? And I thought a few bolt-ons out there actually helped with gas mileage... I'm just not sure I want to get something that could have possibly only yeilded me 5-10 highway mpg. Cruising would be pointless and annoying if I have to fill up every half an hour. Not everyone wants a track-only car. I can't live my life a quarter mile at a time! [/Vin Diesel]
Thanks everyone else for your replies. I may just get that Lunati 347 kit.
-somebody
I'm just not sure I want to get something that could have possibly only yeilded me 5-10 highway mpg. Cruising would be pointless and annoying if I have to fill up every half an hour. Not everyone wants a track-only car. I can't live my life a quarter mile at a time! [/Vin Diesel]Thanks everyone else for your replies. I may just get that Lunati 347 kit.
-somebody
Those 2 do not go hand in hand.
If you do not want a track car, stay away from strokers, they are pointless on the street (can never hook).
If you want decent mileage and power, then go with like a stock cubed, AFR headed cammed combo. Still decent at cruising and wicked at WOT.
