I read the following in an article on the LS7 and on CorvetteForum so take it for what its worth:

Crate 505 fwhp LS7 was rated with LS7 manifolds & stock air intake track as installed in car and with all accessories. SAE dyno standard requires a running at specific rpm for a certain amount of time on ebgine dyno then measure and the revs are increased rinse & repeat. Likewise, a GM engineer previously suggested the 505 fwhp result wasn't ideal as one of the qualifying SAE engines didn't perform ideally or as well as some of the others. The worst result was used for the rating.

Know of someone that slapped a crate LS7 in a 77/78 Trans-Am with headers & customized intake tract and it dyno'd 465 whp. Really wouldn't expect to see 465 whp out of a 505 fwhp LS7 either but it's happened before. Not too far off of John B's ~487 whp out of a 505 fwhp LS7. Tuning, weather, different dyno different days, different tires & wheels etc.

 

The LS7 w/headers on an egine dyno reportedlymade in the range of 550 FWHP so I believe my 487 w/headers is in the realm!

 

Are we saying that a 15% loss of power through the drivetrain is arguable? The Corvette with a 505 hp engine generated about 430 to the tires. You need around 575 fwhp to reach 487 to the tire and your not making that much of a gain from a set of headers alone. More cam and induction is needed to achieve this.

 

No. Zero argument here about drive train losses be it 75hp or 15% or 12% or whatever.

We're saying with headers, tweaked intake track & tuning a crate LS7 rated at 505 fly wheel SAE hp can end up making 465+ whp to ~487 whp.

Headers, intake track tweaks & tune adding ~30 to 50 whp.

Anyway, if I go to the trouble & expense of swapping in an LS7 it's going get headers, intake track tweaks & tune and be nudged over ~430whp without going into the engine. I imagine most folks would do the same with the stand alone crate LS7/570 nudging it to around ~485 to 500whp.

 

Your posts have always been very informative and I enjoy reading them. I can see that being a possibility and with a decent cam wake it up even more.

 

01CamaroSSTx - A++

Definitely more cam duration for an even happier LS7 😄☺️☺️

 

GM rates engines with production air intakes, exhaust manifolds, full accessories including mechanical water pump, I suspect - at normal 220* operating temperature, AND they use SAE correction on their engine dyno figures which is not typical for the aftermarket. Engine dynos are typically shown with STD correction.

The same was true for the LS570 crate package (RIP).

C6Z's routinely dyno 445-465whp SAE bone stock depending on the dyno and 91 vs 93 octane. Headers, intake and a tune you're at 490-510whp typically.

 

Glad we don't race dynos. They're a great tool, but numbers are only valid when compared to a baseline, imho.......

 

Agree best use of dyno is tuning. The numbers help provide a rough rule of thumb at best.

 

Right. A dyno is a measuring stick with no precise graduations. Baseline is one mark. Mods are proportional marks further up the stick. The stick applies only to the engine in question and should not be compared to other "sticks" (dynos). My take on it.....

 

As for your take, it's less than worthless since none of it is based on actually doing mod's to an LS. That's my take on it.

 

Just because GAtsma has never even touched an LS engine, other than changing the oil on his Tahoe…ok it’s less than worthless. LOL!

 

I own one and do light work on it. It's my DD. But this really is about dynos and their worth as an absolute measuring device. But keep talking...

 

Just telling the truth Gary, by your own admissions. You offer ZERO To the site here, with the exception of name calling and telling folks they have replied to an old thread. And there’s the occasional English class lesson. Everything you post that’s half technical, you’ve read somewhere, and your only repeating it. Your what most refer to as a parrot.
If I had a dollar for every PM I’ve received complaining about you and Andre, I could fill my truck up with gas. I could go on and on. Shall I keep talking?

 

Well EXCUUUSE ME!! Sorry if I've offended your higher technical senses.
Many here are not world class engine builders. Include me there. If I "parrot" something I've read, you can bet I've vetted it with other reliable (likely by your standards) sources.
I've worked on a fair number of other engines over the years, just not LS's. Most of the same rules apply here too.
My so-called name calling is usually provoked, and admittedly should have been avoided. My apologies there. The old thread stuff is a response to those non-observant enough not to check post dates. Sloppiness on their part.
If someone PM's you about me, they're cryin' to the teacher instead of facing me. I can stand up for myself. PM me instead. If someone rubs me the wrong way, they'll know it from ME. I don't tattle. I've only had maybe two people PM me about not liking what I said. One was 8lug, who was obnoxious and left, the other, we came to see eye to eye once I explained my side of things.
And then you group me with Andre. At least lately he's a LOT more coherent. I actually enjoy some of his latest posts. But other times....

 

How I get into this BS idk... but
Generally you'll see Folliwers not Professional builders who speak on something they don't know 💩 about. reason they send pm's is the BS there saying is typically BS and I got it straight from a Professional.

Elimination of BS by not referring to non Professionals
🤫 some of the BS only holds true in Lsxtech world..

 

The thread starter is the only Person I can remember having had any test done with Multiple things. Most are sold on conversation... There's 2 sides to a coin same with a engine and parts. Hell and I haven't read the thread. Just was reading the last post.

 

I don't know what side of the bed some of you woke up on but just because someone choses to cite information found somewhere else regarding automotove talk dosen't make you clueless as to what the discussion or topic is about. I call that being smart and saving you from having to explain it. No disrespect Scott but to say that someone offers ZERO to the forum just isn't correct. What I'm saying is that just becasue one does not know all the ins and outs or secrets to building engines dosen't mean they don't have anything to offer to the forum.

Simialr to biting the hand that feeds you or should I say under your own flagpole!

 

Now off work with my blunt watching ABC news.
So
You guys F"ing with G because of this... lmao then Chevelle jumps in...

F'ing with good older people?.... Sounds Fimilar Chevelle and the pm you sent me yrs ago....On G.
I hate Belittled conversations. As I've Been Belittled, yet I knew my Goal of getting with the right People so I can get my goal of being Smarter than any avg MF'R besides a professional and I'll check them also.

Some people need to be talked Crazy to.....

G isn't 1.

Btw ...I don't go by Andre, No one who knows me calls me this.

From Paco 👍


On the crate Ls7?
Build your own without the headache you are your own Warrenty. Also why build a 427 for Ls3 hp...real talk.
More avg power and still DD?

if what's so valuable about the Ls7 why is it then when a guy builds one You will Never hear a great builder use any of the parts? Heads, Crank, Rods, intake, cam.

Bump ...throw the Damn block in also...

2yrs Warrenty /24k miles

Your better than this thread starter.

 

Catch 22
Factory Warrenty at $12k vs maybe a little more and better parts, for future reference. Darin wink wink.
1 phone call to Erik or his Youngens in H Squared, or any good ls builder etc..

the GMPP Experience or Thanks for the technology for 570+ hp?
Sorry, Thanks but give me the Human experience.

🎤 dropped. Out.😂🤣