how much HP, opinions

[turkeybird56]

How to Get More Power Out of A 5.7 Hemi [UPDATED]

If you are a proud owner of a 5.7 Hemi, you should know that your metallic beast can become even more ferocious. Sounds too good to be true, right? But it is!

mechanicinsider.com

 

[kurek]

Given that the RFE transmission was originally designed around the 4.7 at the end of the 1990s and has really been stretched to its limits to be reliable behind a stock 5.7, don't forget to come back here and call the transmission a "piece of junk" after you boost the horsepower on your engine way past what it was designed to handle.

 

[IDSandman]

My buddy that worked at Big 0 Tires had a 2011 Sport and he was talking about 500 hp but he had long headers, tune and cammed out I believe ... So you could be looking at around 420 hp with just a good tune and shorty headers alone probably closer to 450 hp realistically

I could be wrong but I find it very difficult to believe that he gained 100hp just off those listed mods. Procharger bolted on, absolutely.

 

[CheechDogg.0n37s]

I could be wrong but I find it very difficult to believe that he gained 100hp just off those listed mods. Procharger bolted on, absolutely.

That is what he claimed not me ... and the cam alone can gain up to 150 HP if it's a stage 2 from what I understand ... What exactly he did I have no clue, but his flex was 500 hp on that hemi ...

 

[CheechDogg.0n37s]

But I do know that a stage 2 is turbo charge application so you probably are correct about that ...

 

[kurek]

I could be wrong but I find it very difficult to believe that he gained 100hp just off those listed mods.

I got a Diablo for my wife's car a while back just to correct the speedometer for new gears, the canned tunes make the car worse so we put it all (other than speedo correction) back to stock after trying them out.

But the reason I bring that up is they boast 20 horsepower just from the tuner and I'm certain all of that power comes from just raising the rev limiter a little bit. If your heads and intake can flow enough to keep making torque a few hundred RPM higher, boom higher peak horsepower number.

Doesn't really make the car faster in any material way but look at that number you can point at!

 

[16WhiteQC]

Hmmm, a good tune - 30hp, good shorties - 10-15hp (some how kooks claims 25+ with their shorties, i doubt that though), intake/muffler maybe 5hp.

Best case +50hp

 

[seabrook]

I could be wrong but I find it very difficult to believe that he gained 100hp just off those listed mods. Procharger bolted on, absolutely.

just longtubes and a tune is close to 50 hp. plus a cam i could see it. fi would yield way more than 100

 

[seabrook]

I got a Diablo for my wife's car a while back just to correct the speedometer for new gears, the canned tunes make the car worse so we put it all (other than speedo correction) back to stock after trying them out.

But the reason I bring that up is they boast 20 horsepower just from the tuner and I'm certain all of that power comes from just raising the rev limiter a little bit. If your heads and intake can flow enough to keep making torque a few hundred RPM higher, boom higher peak horsepower number.

Doesn't really make the car faster in any material way but look at that number you can point at!

what does she have? my buddy did a henessey tune on his 6.1 and it was very noticeable! also a guy here at work tuned his 392 charger and he said it made it dangerous lol (he’s a chemE)

 

[Sillygoose]

cammed out, yo