Ok, For some reason the '04 coupes have been putting down a bit more hp than any other year. My tuner seems to think GM either changed the cam a bit or the heads have slightly better airflow. He has seen higher numbers from '04 coupes that are stock than earlier years. I say this b/c I have heard some strangly high rwhp numbers from a stock '04 C5. I knew a guy who had an '04 coupe bone stock put down 334rwhp WITH AN 11.3 A/F RATIO!! A/F ratios for N/A should be 13.0 so I suspect a hidden 15rwhp was to be had. I myself with made a slightly higher number with my magnacharger then "most" others (mine was an '04 as well) So You guys that are dynoing your '04s, what are your Air/Fuel ratios?? What are your numbers??

 

334 stock...damn, that's pretty good!

 

334 ( if we are talking about a Mustang dyno ) on a *completely* stock C5 sounds like BS. I would be curious if any other tuners have observed the 04's to be more powerful than earlier C5's.

Mark

 

Mustang or a Dynojet, for a bone stock A4 or manual, it sounds like BS.

Well, I won't speak to mine. But I know a guy who has a neighbor whose cousin met a guy who saw one on dyno at 340hp/350ft lbs of torque in 98* weather, bone stock with only 200 miles on it. It was a "freak".

 

Uh-huh.

 

That seems a bit high to me as well. I would like to see the dyno sheet on that one. Kaley

 

[QUOTE=EB20003



Well, I won't speak to mine. But I know a guy who has a neighbor whose cousin met a guy who saw one on dyno at 340hp/350ft lbs of torque in 98* weather, bone stock with only 200 miles on it. It was a "freak".[/QUOTE] there is no reason to be a jerk and mock me, just keep your mouth shut if it doesnt apply to the thread.

 

there is no reason to be a jerk and mock me. Keep your mouth shut if it doesnt apply to the thread.

 

My post was in jest and I thought you yourself were somewhat skeptical, in that you said:

" I say this b/c I have heard (not seen mind you) some strangly high rwhp numbers from a stock '04 C5..... I knew a guy who had an '04 coupe bone stock put down 334rwhp.."

You don't say if you personally witnessed this, which lead me to believe that you, perhaps, may had your own doubts. I was just picking up on what I perceived as your own skepticism.

However it seems that I erred, in that from the tone of your last post, you seem to actually believe that aforementioned information.

334hp at the rear wheels of a bone stock MN6 works out to near 395 bhp in a car advertised as 350 bhp. And nearly 410- 420 bhp in an auto rated by its manufacturer at 350 bhp. Undoubtably, some cars get underrated. But to this extreme seems unlikely, if not impossible.

For reference, a stock Z06 usually dynos out at approx. 345-350 rwhp , give or take fewer than 5 ponies. Just 11-16 rwhp above that 334.0 number. Which could in theory be made up with just an intake system.

If for the nominal price of a Blackwing, that car's owner can produce the same RWHP nbrs, or even get to within 5hp, of a late model Z06 owner, I am truly envious and in awe. And downright flaberrgasted in the event that the 334 RWHP, referenced, bone stock, car is an automatic. That has to be a record.

My bad for overreacting to these quite lofty and obviously impressive numbers.

 

I don't want to hurt anyone's feelings, but that sounds pretty high to me also.

 

My 04 Coupe M6 pulled 319hp 325tq SAE on a Dynojet with a Halltech Stinger.

My DynoGuy says that that is a bit stronger than what he sees on his dyno for a C5 with an intake, said they are normally 300-310, on his specific dyno. My AFR with just the stinger was 11.5:1 and dipped into the 11.1:1 range for a bit.

Anything is possible, no matter how unlikely.

My car had only 4,000 miles on it, so it was relatively "tight".

334rwhp could happen, if the Dyno's weather station was whacky that day.... alot of variables can play into the numbers.

 

With all due respect, and not to belabor the point, but that Halltech Stinger means that your car was not stock. The original post concerned a car which was "bone stock". The Halltech Stinger is recognized as being a very good intake system and capable of very good HP increases over the stock paper filter and airbox.

And could very well have accounted for the 19 in that 319hp your car dynoed at. It would certainly be within reason to expect 12, 15, maybe as much as 19 RWHP with the Halltech Stinger in an otherwise stock car.

Which would put it at around 304, 307 for "bone stock." A very far cry from 334 "bone stock."

What did your car dyno out at with the stock paper filter and airbox?

If that Halltech Stinger got your car to 319 starting "bone stock" from say, 304 or 307, just think where you would be now if you had started "bone stock" at 334 You'd be approaching 350s.

 

Dude, re-read my post.

That means, HIS Dyno normally has STOCK C5's + Intakes (BlackWings are most popular he says) hit 300-310.

As I was saying, and the point was, every dyno is different. if that guy hit 380rwhp stock, and all the others that went to it hit 360+hp, then it did.... ON THAT DYNO.

Dynos are great tools, if you know how to use them. You need to go to the same dyno all the time, you really can't compare charts from one shop to another, as you can see on the internet, numbers are all over the place, due to setup of the dyno in question.

I use 1 shop, and use his dyno to verify modifications as they are made, and to log my AFR for tuning that mod.

When I had my last LS1 Camaro, I got a 20hp increase in 1 day by visiting another dynoshop on a dynoday..... which was my real HP number? Who knows, who cares? It's a tuning tool only.

That's why I don't quote numbers to people when I'm at a party and they ask "How much HP did you get with the Headers and Nitrous?" I just reply that I'll put money that it's more than they have and we can find out at a track if the price is right.

 

Yes. Well.................... Those are all "good" explanations, I suppose. I'm sure that some here, myself included, who possess equal skills to those you have demonstrated, in proffering "potential" explanations for that 334 RWHP nbr, can well,....come up with a few "other explanations" of our own.

Some will find those "explanations" to be somewhat more, shall we say........ "feasible" ..."probable" ... "likely" ... than others.

One quite feasible explanation for a reported 334 RWHP in a bone stock C5 immediately comes to mind

If you choose to accept a 334 RWHP number for a bone stock C5 as an accurate representation of it's power, and that it was due to the stars lining up right, go right ahead. I ain't buying it though

 

My 99 C5 dynoed 301 rwhp & 312 rwt stock.
W/ an intake it dynoed 316 rwhp & 323 rwt.
W/ intake + exhaust it dynoed 323 rwhp & 328 rwt.

If he is dynoing 334 rwhp than that's fantastic.

What are other '04 C5 owner's dynoing?

 

A local tuner here in Toronto was recently caught to be "cheating" with his dyno numbers. Everyone had inflated numbers, due to the fact that this guy would put a heater beside the dyno, so it would think the ambient temp was 140F and then the corrected dyno numbers would be severely inflated. Some guys were dynoing over 400rwhp, then went back later when the new management took over the shop, and found out they truly only made 370 to 380rwhp.

 

The correction numbers are the ones that are screwed with, I know I preach this all the time but I spent a lot of time looking at combos and dyno numbers on the forum for 2 years and firmly believe you should take your uncorrected numbers and run you own DA for the time of the dyno in the area and you will see similar numbers with similar packages from all over the country--take your DA at 3.5% hp per 1000feet of DA either plus or minus, when computing the DAa use the heat index number rather than actual temp as the 3.5% has been the rule of thumb in aviation for many years and does not consider humidity which does not apply at altitude---or simply state your uncorrected numbers along with the current DA and we can pretty well figure out what you have--rear gears seems to average a loss of about 10rwhp and 5 of tq--corrected numbers are bs--I've seen 1840 ft DA in FL and the dyno wanted to take 2% when it should have given apprx 6.5%--so what were the uncorrected numbers on the stock 2004 coupe--

 

I know his cousin.

 

Damn,

Now I know why those guys from ECS keep their grill near their dyno.

 

If you want to call someone a liar, be my guest. I didn't claim those numbers were accurate, I was simply telling you, to re-read my original post that you so quickly replied to about my car not being stock, which I said it wasn't.

You're barking up the wrong tree if you're looking at me.