jrtf83

anybody get a chance to see this?
In the November issue of Chevy Hi Performance, they did a writeup on nitrous on an ls1 crate motor. They made 424 hp/424 ft lbs on a bone stock crate ls1 (They did mention it had the ls6 intake). Our motors arn't comign even close to these numbers stock , barely with alot of work (H/C). Is this because of the difference in dynos? Exhaust? A/C and stuff? All of the above?

Sorry if this should be in a different forum.

Boostaholic

iTrader: (4)

They are probably mesuring FWHP, and what kind of shot are they using, I would guess a 150 shot?

Lafngas98Z

iTrader: (1)

Yeah that was an engine dyno, plus they used an electric water pump. No loss thru the drivetrain, or accessories.

jrp

iTrader: (16)

FASTONE

A stock ls1 will make about 425 hp with headers only,I"ve seen this in numerous magizine test.All stock internals,electric waterpump only gives you about 7-8 hp, 10 at the most.

Henry D

As it's already been mentioned, all tests are conducted on an engine dyno and we do use an electric water pump.

1BADFNZ

Yeah mine with header made 345 rwhp through cats and full exhaust with all belts and such so that's about 425 or so at the flywheel

GTS346

iTrader: (1)

Here's reality for you.
Our Aus spec LS1's are rated at 300HP.

When I put my LS1 stock engine on engine dyno ran it up it made 300HP. With stock programming (very detuned)

With HP tuners and 1 5/8" pipes it made 370HP at engine. This is coming from 1 of the best LS1 tuners in the country, his own standard test engine only made 375HP with larger headers.

So standard cam LS1's are good for 360-375HP at engine.

With a comp 220/0.560 on 113LSA we went to 412HP at engine.

The only engine stock you will get over 400HP is from a Z06 LS6 engine or Callaway C4B, stock LS1 has no chance of making it, don't believe me then do what I did, put your money where your mouth is, rip the engine out and spend $2000 running it up on an engine dyno and don't be dazzled when the figures are a fair bit lower then your expectations.

TD's z

A set of our Stg 1.5 5.3 heads on a stock shortblock, with a Comp 228/230 cam, headers and FAST fuel injection made 540 FWHP, I think the engine made 480-490 without ported heads. However, once installed in the car it made 440 RWHP with a LS1 computer.

FASTONE

Last time I looked I was in the United States not the land Down under,sorry if yours have LESS power!

black_knight

iTrader: (1)

Fastone isn't being very nice about it, but he makes a point: what if there are differences between the US and AUS spec LS1's? They might be using differant cams or manifolds. Also, remember some LS1's have the LS1 intake and others the LS6.

Also, the numbers: were they corrected or uncorrected? There are a lot of variables here...

FASTONE

I"ve seen these stock GM crate motors tested by like 6 car magizines and they all come around 425 or so with 1 3/4 long tube headers only and the stock computer tuning. A 224 cam and some ported heads puts them to 500fwhp or there abouts.Maybe 375 hp with the cast exhaust manifolds.A stock ls1 will put down about 325 at the wheels,right???

Bad30th

iTrader: (13)

"Engine on a stand" dyno vs. "engine in the car with drivetrain and accessory losses" dyno, guys...

Jeez, my car would be 500+rwhp on an engine dyno, N/A.



Bad30th

z98

They sell stock LS1 engines as "420 hp crate motors."

That should tell you something.

FASTONE

THANKS !!!!!!!!!

slow trap

iTrader: (22)

i think m6 cars lose around 15 percent power so with longtubes, a free flowing exhaust and only the the accesories they use on the dyno we need around 355-360 rwhp to have 425 at the flywheel,so that sounds about right.

Henry D

Not like it'll validate anything, however, I'd like to get my .02 in. I've built and dyno'd an untold number of engines with various combinations and I've "ALWAYS" told it like it is. The numbers you read are the numbers I get.

If you have any questions, I'm on many boards, from Fords to local clubs, making it easy to get in touch with the so-called unreachable magazine guys.

I'm a gearhead by heart and I certainly don't do this line of work for the pay.

Best Regards,
Henry D
Technical Editor
Chevy High Performance

FASTONE

Hey HENRY,great to hear from a guy from chp,great magizine,glad to see you guys are trying to do some work with the new smallblock.This site will bring you up to the latest and best mods for the ls1.I really like Chevy High Performance a lot,but lose the 305 crap.I love smallblocks but anyone who would build a 305 is silly.Same with the small cube bigblock,if you"re going to build a bigblock go for the cubes!!I used a lot from the 406 vortec headed torque monster build-up CHP did but I extensively ported the Vortecs and put in 2.02 and 1.6 valves,Flowed 252 at.500 and 203 on exhaust.Used the 1 3/4 headers and Air-gap with 750 Mighty Demon,used a Comp custom 230-236 @.050 with .550 lift and the Comp 918 springs(Thanks CHP!!)Oh yea got the 109 LDA idea from the Lunati flat tappet cam you guys used,its idles with a nice lumpy sound and runs great!!MORE LS1 STUFF!!!5.7 AND 408 ironblock strokers!!!Also when doing the cam swaps and such get someone that can TUNE IT for that cam to get the most out of it.Also give us some new tech stuff like you do for the sb and bb Chevy.Tell us about the new stuff coming out,like the new Edelbrock ls1 head.When are you guys going to test the new spaceage rollerless Crane shaft rockers that claim 20 hp over roller rockers!?Hey Jeff is gone,step up to plate,lets see what ya got!!!Devoted CHP reader here!!!!!!

GTS346

iTrader: (1)

As far as I am aware, our Aus spec LS1's have LS6 manifold and injectors standard, pretty much a Camaro/Firebird 345HP engine detuned.

I use an engine dyno, chassis dynos are good for one thing, tuning, forget the figures they show look for the improvement between tunes.

Doesn't bother me if we have the same engines, same internals, they perform the same but yours has an extra 100HP.

Use the dyno for tuning dude, leaving the bragging for the track.

So correct me if I am wrong, maybe Henry doesn't know what his talking about (excuse the sarcasm Henry) but if they are supposedly 425HP engines stock, Henry's test engine with LS6 intake and a 150HP shot of NOS should have at least 550HP correct (120-150hp shot on 425hp motor). But after 150HP shot engine makes only 425HP, so that would put the engine at around 300HP standard? Nah you guys claim 425HP stock, what would CHP know?

So we come to the conclusion that
A) Henry's Test engine is running on 6 cylinders
B) Henry's dyno needs recalibarating as its out 150HP to start with
C) It's just a huge coincidence that my test engine, Henry's test engine and the other 500,000 test engines have 300-350HP standard
D) FASTONE reads a magazine writeup stating LS1's are 425HP standard and we should all take his judgement for them as he is the LS1 KING.

I think the moneys on D.

PREDATOR-Z

Was it you that Edited the intake manifold shootout a few months ago in CHP??
Boy that was a winner

In any case, FWHP don't mean **** to our majority readers/members here. What interests us is power to the pavement, simply because we actually DRIVE our cars and do not only write articles about them with pretty pics.

Actually come to think about it there is more on R&D, novelty news on this forum, and by the time anything gets printed in any magasine, we have allready disected it, argued it, discussed it, bashed it, modified it and tested it on numeral occasions.