How much HP can you add to a LQ4 fuel system?
Upgrading the LQ4/LQ9 Fuel System and Tuning The factory injectors are only rated at 25 lbs. and won’t support much more than 380 hp. Plan on upgrading to larger fuel injectors to meet the fuel demands of increased power. Custom tuning will be required to properly adjust the fuel and ignition timing.
Does the GEN III LQ4 give a run for its money?
Giving the Gen III 6.0L LQ4 a run for its money. If you are new to the LS scene or haven't spent much time online, or at events, or near other LS owners, you might have missed the first or second "big bangs." Originally, the big bang test was designed to find the absolute boost and/or power limit of the factory LS short-block.
How many miles does a stock LQ4 have?
While the engine may have borrowed four rods from another motor, for all intents and purposes it is, in fact, still just a stock bottom end LQ4 with 250,000+ miles and a few parts with unknown milage. Matt swore he wouldn’t fall prey to the same trappings as previous attempts and tore into the fuel system for what he swears is the last time.
What is a LQ4 engine?
The LQ4 is a Gen. 3 small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 6000.
How much power can an LS handle?
Even in emissions-legal trim, a blown LS1 will pump out over 500 wheel horsepower, with 800 wheel hp available for a serious stroker effort. With turbo motors, the sky is the limit, as 1,000 hp is a common occurrence, with the ability to adjust the power output by turning a simple boost knob.
What heads came on LQ4?
The 1999-2000 LQ4 had cast iron cylinder heads. All others had aluminum heads.
How do I get more power out of my LQ4?
How to Get More Power From Your LQ4 or LQ9With iron block strength, they are the first choice for boost or nitrous applications.GM made a bazillion of them which helps keep prices down.Gen. ... The heads flow similarly to LS6 heads, but have bigger chambers making them boost friendly.More items...•
How much HP can a stock 6.0 LS handle?
If we were to run the 6.0L in stock trim, the resulting power output would be around 400 hp (on this dyno the way we test). If we apply 14.5 psi from our turbos to the stock 400hp engine, we might get 800 hp.
Why use a stroker forged crank?
They’ve been known to handle over 1000 whp. The main reason for going with a stroker forged crank is for the added cubic inches. The extra cubes bring boost on quicker which means you can use bigger turbos.
When did the LQ9 come out?
That changed in 2001 when GM threw in the bigger cam and aluminum heads designed for the LQ9. The LQ9 was introduced in 2002 for the Cadillac Escalade and was found in top-of-the-line trucks until 2007.
How to maximize torque in mid range?
To maximize torque in the mid-range, manufactures close the intake valve at about 40 degrees (@. 050 in.) after bottom dead center and alter the intake valve opening to set the idle quality. The bigger the engine, the smoother it will idle for any given cam, which is why you’ll see the 6.0L LQ4 and LQ9 engines getting slightly bigger cams than the 5.3L engines.
How many rpm does a LS3 engine pull?
Flow numbers can be as high as 325 cfm at .600 lift. Lightweight hollow stem LS3 valves can be cut to 2.000 in. to fit the seats. Between the light valves and better springs, the engines will pull cleanly to 7000 rpm.
What cams make good power?
An LS3 or LS9 cam makes good power, but not where you want it. What you need is a cam that delivers a gut-punch right where the converter hits. We recommend a dedicated truck cam.
Why upgrade fuel injectors?
Plan on upgrading to larger fuel injectors to meet the fuel demands of increased power. Custom tuning will be required to properly adjust the fuel and ignition timing.
Why are LS engines so popular?
Because of their strength, these engines are likely to see a power-adder sooner than later. These engines are some of the most popular GM LS engines for several reasons: With iron block strength, they are the first choice for boost or nitrous applications. GM made a bazillion of them which helps keep prices down.
Who supplied the boost for the 6.0L?
Boost was supplied by a pair of BorgWarner S475 turbos from John Bewley at Lil John's Motorsport Solutions. Capable of supporting nearly 1,000 hp each, the turbos were plenty capable of putting the big bang on our 6.0L.
How much horsepower does a 6.0L turbo have?
After the turbo system was up and running, we snuck up on the terminal boost pressure. The twin-turbo 6.0L made multiple passes near the 1,000hp mark, but we eventually started cranking up the boost. At 14.6 psi it produced 1,054 hp, while 20 psi pushed things up to 1,277 hp. At 25.3 psi it was up to 1,435 hp, but the big bang came at 28.5 psi and 1,482.7 hp. The engine was on track to easily exceed 1,500 hp, but one of the sissy Gen III connecting rods called it quits.
What size throttle body is used for Holley Hi Ram?
To optimize power production higher in the rev range we enlisted the aid of a Holley Hi-Ram intake manifold combined with a 105mm Holley throttle body.
Short-Block
The engine itself is out of a '03 Chevy van that was wrecked, and is "stock-ish" according to Mario. The LS still retains the factory crank, rods, and pistons, but the rings are from Mahle, and have been opened up quite a bit.
Fuel System
If there's an overkill portion of Mario's car it's probably the fuel system, which is built to the hilt. First fuel travels through a -10AN line to an Aeromotive Eliminator fuel pump, along with an Aeromotive regulator and -8AN return. Injectors are big 200 lb/hr Fuel Injector Connection units, which are compatible with both gasoline and E85.
Transmission
One of the more interesting aspects of the build is the transmission, which is just a warmed-over Powerglide. Mario went through and rebuilt it with a few choice goodies, including a TCI trans brake, valve body, input shaft, and additional clutch packs. Other than the PTC torque converter, the rest of the transmission is all stock.
The '67 Camaro
Part of the reason Mario's car is so quick is that it weighs a light 2,750 pounds with him in the driver's seat. The chassis is a mild steel rectangular tube affair that was built on a budget just like the rest of the car. Mario says that his plan on most tracks is to leave at around 5 psi and 4,000 rpm and let the car do its thing.
Is the crank the same as the stroke?
the cranks are the same, even the stroke..
Do LQ crankshafts have the same stroke?
The crankshafts have the same stroke, but are different due to the difference in piston weights; you'd need to re-balance the assembly if swapped. The earlier LQ crankshafts are also longer at the rear flange.
Is the LQ4 crank the same as the 99-00 crank?
Sorry to dig this up, but the LQ4 crank is NOT the same, at least the earlier 99-00 one's arent.
Do truck crankshafts have to be drilled?
Also worth noting, the truck crankshafts were not drilled through like the car cranks were, so the truck crank will be a bit heavier.
JAMEST
I was looking at buying a used motor that has an LS1 crank in it and was wondering how much power the crank can hold?
packjh
If i remember correctly they are pretty strong. I think the better question is how much hp are you trying to get? It could hold depending on what your goals are. If you want you can always ask chase on how to NOT blow a motor up
JAMEST
i am wanting to run a turbo on it. I would do all forged internals, i was just wondering if the crank would hold 800hp. my stock lq4 is holding 590 hp at the crank right now cross my fingers.
