Should I have it retuned??

[Mikes_Slow5oh]

So I just did long tube headers and high flow cats because the old cats were so restrictive the car wasn’t making any real power. I had it retuned and it made 728WHP (was told it made 715WHP before the added upgrades) but it only makes 576 torque. Is that normal??

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[cerbomark]

I m gonna guess here until the experts arrive but lowering the back pressure on an exhaust can negatively effect torque.

 

[Jasonb543]

That’s super normal, a lot of Tq for the HP you’re making actually.
Any idea what it was making before headers?
Didn’t realize you had cats still, not a fan of boost and cats.

 

[engineermike]

You have a pd blower so exhaust restriction, or lack of it, will not appreciably affect flow. You will gain a little due to a reduction in pumping losses.

 

[Mikes_Slow5oh]

That’s super normal, a lot of Tq for the HP you’re making actually.
Any idea what it was making before headers?
Didn’t realize you had cats still, not a fan of boost and cats.

I was told it was 715WHP. The car runs amazingly I just didn’t know it was that normal to have such a large gap between the two numbers. I’ll be going cat less soon but I’m in a country with emissions so it’s going to take a while before I do.

 

[sms2022]

I don’t think that’s abnormal for a 5.0. It’s a small displacement motor that revs high to make power. I’m not boosted though so maybe someone else can share their numbers.

 

[Fusion Training Systems]

The 5 liter isn’t a Torque monster. It makes its HP at High end.

 

[robvas]

I m gonna guess here until the experts arrive but lowering the back pressure on an exhaust can negatively effect torque.

that is a myth

 

[cerbomark]

that is a myth

which are you saying is a myth, until experts arrive or less backpressure causes torque loss??? LOL

 

[Red65]

which are you saying is a myth, until experts arrive or less backpressure causes torque loss??? LOL

Reducing back pressure causes torque loss is definitely a myth that’s been busted time and time again. Take any engine combo and adding any exhaust restriction at all will always make it lose power. How much it loses is highly dependent. The only reason you could possibly lose power by removing exhaust volume is if you go to open headers and you don’t have enough header extension, but that’s not related to back pressure. That deals with things like exhaust pulse resonance, but the lack of restriction would be the same regardless.

 

[SnowFox]

It would be nice if tourqe and HP where on more of a logarithmic axis.

 

[ice445]

The torque seems low but it's really not. You get it pretty early on and it carries to redline, which is why the power is what it is. Torque over time = work done. And hoo boy is that engine putting in work.

A higher torque peak make it feel more vicious (and your mind feel better) but that's about it. A lower peak but more consistent over rpm is much nicer to things like clutch/axles/etc. It's part of why stock coyotes are so good to boost.

 

[junits15]

The torque seems low but it's really not. You get it pretty early on and it carries to redline, which is why the power is what it is. Torque over time = work done. And hoo boy is that engine putting in work.

A higher torque peak make it feel more vicious (and your mind feel better) but that's about it. A lower peak but more consistent over rpm is much nicer to things like clutch/axles/etc. It's part of why stock coyotes are so good to boost.

I've always found it funny that we list torque and power on dyno graphs, when really torque and RPM tell the entire story.

Torque is all we really care about, power follows from that.

 

[Mikes_Slow5oh]

The torque seems low but it's really not. You get it pretty early on and it carries to redline, which is why the power is what it is. Torque over time = work done. And hoo boy is that engine putting in work.

A higher torque peak make it feel more vicious (and your mind feel better) but that's about it. A lower peak but more consistent over rpm is much nicer to things like clutch/axles/etc. It's part of why stock coyotes are so good to boost.

The car runs AMAZINGLY and I’m super excited every time I get in it. I’m new to the platform and was just curious if that’s normal. Thanks for the feedback

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