The chart is scaled down in the forum, making it hard to read. If you reply to the message, you'll be able to see a full size chart. This was the chart from "catback exhaust, offroad x-pipe, k&n drop in filter, and tune".

 

No idea what the tuning changes were - but its the first that has been done that I know of.

I don't live in CA, and don't care about CARB.

Anytime you add power to an otherwise stock engine/car, you affect durability, so that goes without saying. Same things applies to taking a car to the track vs just driving on the street.

Might be. Will have to wait and see.

Call it perception, if you wish. I'll leave it at that.

And this was based on......what? The tubular exhaust? Anything else? Were you one of those that was saying it was probably "maxed out"?

Couldn't tell ya. My guess is catalytic converters and emissions issues, but I'm just guessing. There's a lot of guessing in this forum, so I figure its safe for me to guess too.

 

They did! Shorty headers. There were a few articles on the 5.0 that described the engine build. They said long tubes only added a few more hp and were not worth it to them. I forget the exact number.

 

That's what I meant. They did. It's a good thing.

 

The headers, for one. I don't remember the whole article from 5.0 Mustang, but the impression I got was that the Mustang team optimized everywhere they could within reason, including intake, valve timing, exhaust, etc. Of course, they had to keep it legal for noise and emissions, and they were targeting a certain MPG. If you're allowed more noise, NOx, HC, etc., you can certainly get more HP.

 

Lately, I think the Mustang's been getting more love than the Camaro.

Who doesn't love a 412hp 5.0?

That's within 8hp of Infiniti's new 5.6l DI VVEL super V8. 27hp better than Jag's DI 5.0.

I don't know, but it really looks like Ford did their homework, and part of that was not leaving easy HP on the table. I suppose that could be taken as an implication that I'm saying it's maxed out, but that's not not the intention. But maybe Ford did leave some easy HP behind....

Maybe Chevy did the same thing, but until I see headers from the factory on a Camaro engine, I think Ford went a little further.

 

Couldn't agree more.

Btw, I have recently acquired a 3640lb car with a 320hp LS1. Now that thing is just great with what little power it has (in comparison).

I'd imagine the 5.0 Mustang with 412 hp and similar weight would be even better... at least in a straight line.

Mustang definitely gets more love than Camaro here from the usual suspects (i.e. the non-owners of the 5G Camaro).

 

Bob may be referring to another (nameless) fifth-gen concentric board and if so then I am 100% in agreement.

 

That could be. There are probably other boards out there where people are waving the Camaro flag and acting as proper GM patriots. I only have time to read this one (and on occasion GMI or C&G), so maybe I'm not getting the full brand-loyalty experience [ I don't have time for that ].

 

This must then include you, yes?

 

the powertrain engineer who designed the engine said longtubes are worth only 15hp over the shorties.


there is a lack of understanding conderning the design of the factory "headers". they are not a tri-y design, they are not an equal length shorty, they ARE simply anti reversion headers, and low restriction tubular. exhaust pulses are not merged for low pressure waves, but instead designed to avoid losses from port reversion. they are better than log headers, and marginally better than 05-10 mustang gt pulse tuned cast iron headers.

properly designed long tubes will not have huge gains. but 15 hp is not zero. 12rwhp(15 crank), added to other mods will make their mark on performance.

 

In general, longtube headers make a much bigger difference off-peak. Your post seems to address peak power only. What's the torque difference at 2000 rpm? 3000?

 

After the mods mentioned, the 405rwhp, the car has run a 12.04 @ 117mph on a 1.7 60ft with ET streets.

 

Is that with the stock rev limiter? This is a 3.73 gear option car correct?

117mph from exhaust and a tune!!!! Holy cr@p that's impressive!

 

I am not sure on the rev limiter.

The mods they list for the run go: