ls2 facotry fuel system limitations
Supporting Vendor
Joined: Feb 2011
Posts: 3,520
Likes: 880
2024 C6 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (track prepared)
2019 C6 of Year Winner (track prepared)
doing a build consisting of, intake, ported OEM TB, fast 102 intake, a 7/8" catless headers and full exhaust, trick flow 225cc head and cam combo. this is on my 05 c6, will my factory fuel system handle this? I am going with the FAST fuel rails when I order my intake manifold, but I don't think rails really matter, just doing it for some under the hood eye candy lol.
The car has an LS7 with a very big cam and runs low 10's but I'm still using the stock LS2 fuel pump along with stock 42lb LS3/LS7 injectors.
Supporting Vendor
Joined: Feb 2011
Posts: 3,520
Likes: 880
2024 C6 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (track prepared)
2019 C6 of Year Winner (track prepared)
Drifting
Joined: Jan 2005
Posts: 1,827
Likes: 301
From: Tucson Arizona
St. Jude Donor '08
I have a very similar set up to what you have planned. It is even a 2005 C6. Several thoughts.
I had to upgrade to LS3/LS7 injectors that I believe were 42 lb. in order not to max them out. They are good options because you can get all the injector data from a '06 ZO6 tune which makes tuning them a snap. But remember, maxing out your injectors is ok as long as your WOT AFR is ok and you don't stay WOT for long as in road racing as the injector heat can cause a failure.
The mis-match between the 90mm TB and the 102 manifold can be over come with a 90-102 adapter to eliminate turbulence. I use all three of these.
I had to switch to an LS7 fuel pump due to dropping fuel pressure at WOT but I believe my LS2 pump was failing.
I had to upgrade to LS3/LS7 injectors that I believe were 42 lb. in order not to max them out. They are good options because you can get all the injector data from a '06 ZO6 tune which makes tuning them a snap. But remember, maxing out your injectors is ok as long as your WOT AFR is ok and you don't stay WOT for long as in road racing as the injector heat can cause a failure.
The mis-match between the 90mm TB and the 102 manifold can be over come with a 90-102 adapter to eliminate turbulence. I use all three of these.
I had to switch to an LS7 fuel pump due to dropping fuel pressure at WOT but I believe my LS2 pump was failing.
Last edited by jim2092; Dec 8, 2013 at 12:03 PM.
Thread Starter
Racer
Joined: Apr 2012
Posts: 463
Likes: 5
From: Salisbury PA.
im thinking a nick Williams TB, BBK intake. they said the outside diameter of the TB is the same as factory. really hope my LS2 fuel pump will handle it, I don't wanna replace if I don't have to lol. so the FAST 46 lb injectors should work?
Burning Brakes
Joined: Jul 2013
Posts: 823
Likes: 7
From: Rosewood Heights IL
Fast102 intake is much better than the BBK. And save your money on the TB. Use a stock one.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Race Director
Joined: Oct 1999
Posts: 13,298
Likes: 14
From: Somers NY
Julio said i was maxed out with cam and bolt/ons and recommended me not to run in the cold air, he said summer i would be fine but needed the injectors resized to run in the cold, now im at 60We started it yesterday, & it was kind of "lopy" at 750 rpm idle, BUT is has not been tuned AT ALL.. He said "no problem, & after it's tuned it will idle with a small to medium lope..
I kept the stock 05 mufflers on it because I have to drive 100 miles each way to & from the track and I Cant Stand Any Drone.. He didn't think I'd be leaving too much on the table by using the stock mufflers...
He just finished building another LS2 EXACTLY the same as mine i.e. cam, Heads, Headers, Intake etc.. etc.. & that one made 490 HP & 482 TQ.. it had a 4000 converter and 3.90 gears, I'll be using a 2800 converter, and 3.15 rear gears..
(I have no idea how much difference the converters & rear end gears will make ??
I should know by next Fri as it's getting a roll bar installed this week..
Thread Starter
Racer
Joined: Apr 2012
Posts: 463
Likes: 5
From: Salisbury PA.
ok, well smokey's performance and dyno out of Akron, Ohio will be doing the tuning for my ls2. I just don't want to get out there and the guy tuning it tell me the factory fuel system cant support what you have done to the motor.