Would it be possible to get a list of all the exhausts and their power gains?

[clevernickname]

Oh wow. So what are You supposed to do if you get a supercharger to prevent that?

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[smokinzx14r]

possibly another stupid question, but what's the point of a catback if it doesn't add much power, and an exhaust will make a relatively good noise compared to a catback, for much cheaper.

I work with motorcycles and even a 3 HP gain helps ..We lose 30 pounds going with a aftermarket exhaust ... 30 pounds on a motorcycle is a tenth of a second gain ..3 to 5 HP is a half a tenth gain .. so by adding a aftermarket exhaust get you about a tenth and a half gain in the 1/4 mile .. It all addeds up .. Now on a car 100 pounds is about a tenth of a second gain .. So lets say we lose 30 pounds going with a after market exhaust so I might pick up 3 100s of a second ..Pick up 5 to 10 HP I might get another 1 to 2 100s of a second gain .. So I might pick up a half a tenth and 2 to 3 MPH trap speed ..

Now that might not sound like much but if you are like me every little bit helps ...

What a lot of motorcycle guys and cars guys don't get is you have to do all the little things if you want to go fast .. Every little mod makes power and if you add up all the little mods you make even more power ..The fastest guys leave no HP on the table , they get all they can no matter how small the gain ..

If you want to see what the gains really are you have to look at the hole dyno chart ..Not just look at the peak numbers ... Let say stock exhaust make 377 and you add a cat back and get 378 ..Those are not really the numbers you need to look at ... What you should be looking at the power in the curve ... The curve lets say at 5000 may have a 10 to 15 hp gain and a gain in TQ also .. This is what moves the car .. We don't spend much time a 7k were the numbers are 377 Vs 378 ... We spend most of the time in lower power band .. Take thre dyno charts and overlay them and see what exhaust makes more power in the curve ..

 

[Guard5.0]

You can try the cats, or do what I did, off-road (no catalytic converters in the system). My exhaust is headers straight to an H pipe then straight pipe to the mufflers.

 

[Guard5.0]

In essence, you can buy the brand name headers either with or without catalytic converters. You're in Canada so you probably want to check local and national regulations for the rules on exhaust for vehicles. It is illegal to drive a vehicle in Indiana without cats but there is no emissions testing. If emissions testing is implemented I would have to cut my exhaust to install aftermarket cats.

 

[Guard5.0]

P.S. There are no stupid questions. This stuff is all expensive. It's great to learn and do some research before you buy.

 

[carguy]

So I have nothing to gain from this and the shop that did the Dyno runs doesn't even carry Gibson exhaust, so they too have nothing to gain. EVERYTHING was done on the SAME day. Baselined it, then installed exhaust and ran again.

The first few pulls only picked up about 3hp, then the ECU addapted and they had about a half dozen runs showing th number you see here. Yes, a 19 hp gain. Witchery? Maybe.

 

[clevernickname]

what kind of exhaust? is the gibson an axleback or catback? no headers?

i'm still getting mixed msgs here -___-

exhaust does give like 15-25 hp?

wait - you're getting 390 to the wheels? i thought everyone getting 370whp. at stock.

 

[Guard5.0]

Your car is impressive! 410 RW with just a catback, that thing is making some steam!

 

[carguy]

what kind of exhaust? is the gibson an axleback or catback? no headers?

i'm still getting mixed msgs here -___-

exhaust does give like 15-25 hp?

wait - you're getting 390 to the wheels? i thought everyone getting 370whp. at stock.

Yeah, actually it seems many are getting 380 to close to even 400 stock. Mine is strong but I think somewhat in line. Obviously keep in mind that every dyno is different AND there are different types of dynos.

But yes, it's just a Gibson 3" catback.

Your car is impressive! 410 RW with just a catback, that thing is making some steam!

Thanks, but like I mentioned above all dynos are different. But one thing is certain... Because it was on the same day on the same dyno, I did get 19hp out of that exhaust.

 

[Todd15Fastback]

what kind of exhaust? is the gibson an axleback or catback? no headers?

i'm still getting mixed msgs here -___-

exhaust does give like 15-25 hp?

wait - you're getting 390 to the wheels? i thought everyone getting 370whp. at stock.

Most of the M6 cars that have been dynoed on this forum are in the 380-395 RWHP.

Not disputing the FlowForm guy but he has been the only one that showed any results like this with the Gibson or other catback. Beefcake did back to back installs with 2 different catbacks within a couple hour window and only gained 2-3RWHP.

 

[Tommy V]

Everybodys whp is going to be different,stock i dynoed 385 at one shop dynojet,next shop still stock i dynoed 360 on a dynojet both sae corrected.Best thing to do is use the same dyno if possible and do ur before and after dyno when u add performance parts on the same day.U be supprised how much hp these cars drop when the cat overtemp protect kicks in.This can be adjusted or turned off with a tune.I seen a big difference with it off when i did my tune.

 

[Cascadia_302]

Correct, put the exhaust on, went to the dyno with no tune. Car made the supplied numbers above, then was moved directly back to the bay where SC install began. Only tune for the car was the Roush tune.

Interesting, this is telling me that the ECU has the capability to make some pretty significant adjustments on its own.
Unfortunately other driving parameters would be negatively affected as I could live with those numbers (with no tune) for a few years and FORD couldn't balk on a warranty claim scenario by saying you manipulated the cars ECU.

 

[Tommy V]

Interesting, this is telling me that the ECU has the capability to make some pretty significant adjustments on its own.
Unfortunately other driving parameters would be negatively affected as I could live with those numbers (with no tune) for a few years and FORD couldn't balk on a warranty claim scenario by saying you manipulated the cars ECU.

As a tech myself ive been wondering why it was needed to tune for headers anyway.As long as the 0s sensor sits in the same dept as the factory manifold it should read fine.I know the 02 sit down from the head a little more but with heaters on them that should not matter.The 02is only reading the amount of oxygen in the exhaust and as long as their is no leaks i dont see a reason for tunning.Maybe one of the tuners can chime in?.

 

[smokinzx14r]

As a tech myself ive been wondering why it was needed to tune for headers anyway.As long as the 0s sensor sits in the same dept as the factory manifold it should read fine.I know the 02 sit down from the head a little more but with heaters on them that should not matter.The 02is only reading the amount of oxygen in the exhaust and as long as their is no leaks i dont see a reason for tunning.Maybe one of the tuners can chime in?.

A tune is needed because ford uses a 14.1 or about 14.1 as a target A/F ratio ...14.1 is great for gas mileage and not so great for making power ... A A/F ratio at 13.1 to 13.2 makes more power .. So the tuner adjusts the Map to run at 13.1 to 13.2 .. The duty of the 02 doesn't change , the change is to the target A/F in the ECU mapping ..

 

[Tommy V]

A tune is needed because ford uses a 14.1 or about 14.1 as a target A/F ratio ...14.1 is great for gas mileage and not so great for making power ... A A/F ratio at 13.1 to 13.2 makes more power .. So the tuner adjusts the Map to run at 13.1 to 13.2 .. The duty of the 02 doesn't change , the change is to the target A/F in the ECU mapping ..

Got ya absolutely makes sense.

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