View Poll Results: What should I do for ultimate street machine?
LS7 carb setup
11
57.89%
LS& FI setup
8
42.11%
Voters: 19. You may not vote on this poll
Thinking about running a carb on LSX with LS7 heads
Thinking about running a carb on LSX with LS7 heads I've nearly got everything for my build but am now wondering if I should go with a carb setup instead of FI. I'm looking for suggestions.
Here's the setup so far:
LSX block, Callies 4.125" crank, custom 4.125" -20cc Wiseco pistons for 300+ shot, Lunati Pro Billet 6.125" rods, ported and polished LS7 heads, billet double roller timing chain ---- all equals 441ci with an 11:1 CR, wanting to run E85 and a 300 shot. Looking for 650 rwhp NA.
Now, I've planned all along to run FI, but now I'm hearing people are making more power with a carb setup. Since I haven't yet purchased anything for the fuel system or the induction, I have no quams about going either way right now.
The car will be used on the street on weekends, but will be raced. IThe car will also be driven on the HOT ROD Power Tour.
Obviously FI has many benefits when talking about driveability, but the carb setup would be cheaper and yeild more power.
What do you think? Let the arguments begin.
Here's the setup so far:
LSX block, Callies 4.125" crank, custom 4.125" -20cc Wiseco pistons for 300+ shot, Lunati Pro Billet 6.125" rods, ported and polished LS7 heads, billet double roller timing chain ---- all equals 441ci with an 11:1 CR, wanting to run E85 and a 300 shot. Looking for 650 rwhp NA.
Now, I've planned all along to run FI, but now I'm hearing people are making more power with a carb setup. Since I haven't yet purchased anything for the fuel system or the induction, I have no quams about going either way right now.
The car will be used on the street on weekends, but will be raced. IThe car will also be driven on the HOT ROD Power Tour.
Obviously FI has many benefits when talking about driveability, but the carb setup would be cheaper and yeild more power.
What do you think? Let the arguments begin.
Sorry. The shell of the car, and shell only, is a '57 Bel-Air. I've cut up a wrecked '99 WS6 that I'm taking a lot of parts from. Oh, it'll also have a 6-speed in it. Should be fun.
Last edited by toneloc60; Nov 15, 2007 at 01:48 PM.
On The Tree
Joined: Apr 2007
Posts: 157
Likes: 0
From: Way Out In The Boonies Chasin' Hill Billies, North GA
If it is going to be raced regularly, I would go with the carb setup. That way, when you go to changing your combination later you don't hafta re-tune the EFI every time. Unless, you can tune the EFI yourself...In which case you can't beat the eye-candy of EFI, the reliability of EFI, etc, etc, etc.
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Teching In
Joined: Feb 2007
Posts: 42
Likes: 0
Carbs are not inherently more powerful than EFI. In fact, I would argue that EFI is more uniformly powerful than a Carb, and most would agree.
Thing is, Carbs are easier to tune and adjust for most people. A selection of jets is cheaper than EFI tuning software. And its way simpler.
Thats why we have the 'Carbs make more power" myth, because people refuse to admit they just dont know how to tune EFI. and thats Ok, carbs work great for what they are. The other part is carb manifolds are usually better flowing than other manifolds, LS family especially.
For your use, I would say run a carb, and maybe even a distributor as well. It will make adjusting your set up on race days much easier. UNless you, or someone you pay, is really good at EFI tuning.
Thing is, Carbs are easier to tune and adjust for most people. A selection of jets is cheaper than EFI tuning software. And its way simpler.
Thats why we have the 'Carbs make more power" myth, because people refuse to admit they just dont know how to tune EFI. and thats Ok, carbs work great for what they are. The other part is carb manifolds are usually better flowing than other manifolds, LS family especially.
For your use, I would say run a carb, and maybe even a distributor as well. It will make adjusting your set up on race days much easier. UNless you, or someone you pay, is really good at EFI tuning.
EFI can easily be optimized for better fuel economy, starting, and overall driveability...but a carb will indefinitely make more power in the areas you would need for racing, a carbed setup will generally acommodate a large cam easier and help you to move the power peak up higher in the rpms. An EFI will often develop more power and consistency in the lower rpms but for racing that really doesnt matter, also efi is only on par if tuned properly. It really boils down to what you want to do, cruise or race.
