Ordered another Westers for the 8.1

[o4yukonxl]

Yeah, I finally succumbed to the desire for more HP. I got the rwhp numbers from Lyndon for the 8.1. It's an additional 50rwhp and 70 rwt. That should help. Also eliminating the controversial torque management. Hopefully I'll have it by next weekend. I'll post the results.

[LikeaRock14]

JESUS!!!!!!!!!!!! AND I'M RUNNING A P.O.S JET CHIP?!?!?!

 

I was considering redoing my exhast this summer w/ a complete manifold-back true dual system, but I'm seriously considering this Westers tune!

 

 

LOL I just had to put that on! It's too funny!

[o4yukonxl]

I can't think of anything that will add as much power without going to a supercharger. His results are from his own dyno so you know it's not just BS. Cheapest HP you can get!!!!!!

[tmf6902]

I've had mine for a couple of weeks now, you won't be dissappointed. I will say that I didn't see the MPG gain that others have, but when he programmed it I told him I really didn't care, I wanted performance out of it. But when I stomp it, it goes.

[vortec350]

If you got the all out performance tune from Lyndon it is for performance not fuel economy.But if you want fuel ecomy tune you will still see a big diff.in performance but its not the performance that you get with the higher octane performance tune.

Also,like a rock,I highly recommend gettin rid of that POS jet chip and get you a Westers performance tuned PCM,you would not beleive the performance increase until you try it for yourself.Its like tmf6902 said,and he is another satisfied customer.

[LikeaRock14]

Thanks guys!

It's really my dad's truck (But I just "steal" it wenever I need it lol). He wante Flows, I got him Flows, he wanted the K&N and jet chip, I got him those too. It made a hell of a difference, but after seeming how Wester's tune helps so much, I think I'll swap it for my own good lol! I know he's not worried about fuel economy. when we first bought it 3 yrs ago he just said "Ah, it's a big truck and it's for towing, so I know it wont be great anyways."

But my question about this still:

You all talk about Lyndon programming them to your own specs, so like, you call up, and tell him how you want it? Cu if it's possible, I'd love to have it set for decent fuel economy, MORE POWER , and like harder shift points and a different rev limiter setting and such for towing. I don't know if this combo would be possible, but it'd sure be nice.

And the last question: Do you have to send him the chip that comes out of your truck??? Or does he have replacement stock chips that he programs to your specs? I guess it wouldn't be hard tho if he does need the stock chip, I've still got that in the box somewhere

 

Thanks for the info tho! You've convinced me 99.9999999999%, I just need to get the money first!

[tmf6902]

But my question about this still:

You all talk about Lyndon programming them to your own specs, so like, you call up, and tell him how you want it? Cu if it's possible, I'd love to have it set for decent fuel economy, MORE POWER , and like harder shift points and a different rev limiter setting and such for towing. I don't know if this combo would be possible, but it'd sure be nice.

And the last question: Do you have to send him the chip that comes out of your truck??? Or does he have replacement stock chips that he programs to your specs? I guess it wouldn't be hard tho if he does need the stock chip, I've still got that in the box somewhere

 

Thanks for the info tho! You've convinced me 99.9999999999%, I just need to get the money first!

Basically it works like you thought. You call him, give him your VIN, and tell him what kkind of aftermarket equipment you have for it. Tell him what kind of things you would like it to do, and pay for it....bam a week later you got a new chip. With my truck he sent me the new PCM, and I am supposed to send him the old one back to him or I get charged a core charge. I am going to keep my stock PCM....I just like the idea of having it, incase something horrible happens.

[o4yukonxl]

Lyndon also has a form you can fill out on his web site that asks all the questions. I've also sent him emails to get more information. He programs it for what you have on the vehicle. Be sure to specify the dual tune if your towing. Towing puts a load on the engine and the last thing you need is engine knock.

[gunslinger45]

50 hp and 70 ft-lbs at the rear wheels eh? I know everyone is very satisfied with this product, but I have to ask if this has been verified by anyone on a dyno for the 8.1? That would seem to be a very, very substantial increase and I have to admit to being a bit skeptical about those gains from a new PCM. Just trying to make sure I know the facts.

 

Gunslinger

[o4yukonxl]

These numbers come from Lyndon, who has his own dyno. I don't know if anyone has checked these independently. Even if I dyno it, my numbers won't match since I live a very high altitude. However, I'm not surprised at the numbers. This is a 496 cubic inch engine which is only rated at 320-340 HP. The factory marine engines, which are identical, are rated at 420HP. Some difference is caused by the cats but a lot of it is due to the detuning GM does to protect the drivetrain during warranty. Most everyone I've heard from has gained over .8 of a second in 0-60. You need a lot of RWHP to make that much of a difference.

[americanmuscleman]

Just a FYI, the marine 496's are quite a bit different. The Mercury Marine 496 base model (375hp) has a different camshaft, computer tuning, and exhaust system than the truck 496. The Mercury 496 HO (425hp) has a pretty rowdy camshaft, steel crank, different pushrods and valvesprings, computer tuning, and exhaust manifolds. Also there isn't any intake tubing or a filtering element on marine engines, only a flame arrestor.

 

Actually the marine 496's are underrated. The 496 HO typically dyno's 440-450hp at the flywheel (at 5000rpm) and 510-520tq (upper 4xx torque numbers throughout most of the powerband).

 

[ShortCrew]

I would certainly love to see before and after dyno's. I have never seen an aftermarket computer yield anywhere near those kind of numbers on a naturally aspirated motor. I've seen a lot of posts regarding the Westers. Some were happy, some had no noticalbe gains. I've never seen a post where anyone felt they gained 50rwhp, or even half that.

 

I'm personally sceptical about outragouse hp gains form ecu mods and It seems strange that I have never seen anyone able to back up the claims with an independant before and after dyno test.

[422 SS]

50 hp and 70 ft-lbs at the rear wheels eh? I know everyone is very satisfied with this product, but I have to ask if this has been verified by anyone on a dyno for the 8.1? That would seem to be a very, very substantial increase and I have to admit to being a bit skeptical about those gains from a new PCM. Just trying to make sure I know the facts.

 

Gunslinger

I agree Gunslinger.Those numbers are very hard to believe.I would have to be standing next to the dyno for the before and after dyno readings to confirm for myself.

[o4yukonxl]

Just a FYI, the marine 496's are quite a bit different. The Mercury Marine 496 base model (375hp) has a different camshaft, computer tuning, and exhaust system than the truck 496. The Mercury 496 HO (425hp) has a pretty rowdy camshaft, steel crank, different pushrods and valvesprings, computer tuning, and exhaust manifolds. Also there isn't any intake tubing or a filtering element on marine engines, only a flame arrestor.

 

Actually the marine 496's are underrated. The 496 HO typically dyno's 440-450hp at the flywheel (at 5000rpm) and 510-520tq (upper 4xx torque numbers throughout most of the powerband).

 

 

I was referring to the Vortec HP3 Marine engine. Below are several press release regarding the HP3 which is based on a "Stock Truck Block" (see below). This engine is rated by GM at 525HP, 560 lb. ft. of torque and uses a set of ported 8.1 truck cast iron cylinder heads. As you can see, this engine is a modified Truck 8.1. All the parts from this marine engine will bolt onto any truck 8.1 and the only inhibitor to making the same HP will be the CATs. All this is done without supercharging or changing the bottom end of the motor.

 

"We've incorporated all the strengths of the Vortec 8100 truck engine into the Vortec HP3 crate engine, including the emissions and fuel economy improvements we've made over the years," said Terry Andrzejewski, GM Powertrain Vortec HP3 development engineer. "Then we went back and pushed those strengths to an even greater level. The HP3's impressive performance comes from a naturally aspirated design based on a stock truck engine block."

 

PONTIAC, Mich.- General Motors Powertrain division has developed a high-performance Vortec 8100 V8 concept marine engine, called HP3, to demonstrate the performance capability of its stock truck engines for the marine market. The Vortec engine is the latest marine development project using the 8.1-liter V8 as its base engine and will power several boats in the 2002 APBA Offshore Race Series.

 

 

2003 Vortec HP3 8100 High Performance Crate Engine

Specifications

 

Type: 8.1L V8

Displacement: 8127 cc (496 cu.in.)

Compression ratio: 9.1:1

Valve Config.: Pushrod actuated overhead canted valves ( 2 valves per cylinder )

Valve Lifters: Hydraulic roller

Firing Order: 1-8-7-2-6-5-4-3

Bore & Stroke: 107.95 x 111.00mm (4.25 x 4.37 in.)

Main Bearing Caps: 4-bolt cast iron

Balance Method: Internal engine balance

Intake Manifold: Factory-installed PFI (equal length runner) manifold

Oil Pan Capacity: 8 qt . (7 quart fill level after system charge)

Fuel Type: Gasoline (unleaded)(87 octane)

Fuel System: Port fuel injection

Horsepower: 525HP @ 5400 RPM

Torque: ( lb-ft ) : 560 lb-ft @ 4000 RPM

Engine Rotation: Clockwise (facing front of engine)

Spark Plugs: Platinum (1.5-mm gap )

Emissions Controls: Internal PCV orifice system

Paint Protection: Component painted

Shipping Weight: 734.14 lb (333 kg)

Materials

Block: Cast iron

Cylinder Head: Cast iron

Intake Manifold: Coated cast aluminum

Main Bearing Caps: Cast nodular iron

Crankshaft: Cast nodular iron

Camshaft: Steel

Connecting Rods: Forged steel (1141SAE shot-peened and magnafluxed with 9mm diameter bolts)

Pistons: Hypereutectic coated cast aluminum

Manufacturing

Assembly Site: Tonawanda, New York

 

I'll try to find the time to get a before and after dyno of the Westers, I too am skeptical but the current motor feels very detuned.

[linda]

its been 2 weeks since your first post "04yukonxl" ......you havent got the PCM yet?