Anyone else read the testing in the new EC where they dyno'ed the Magnaflow and Supersprint cat-backs and recorded nearly zero gain? Interestingly, they showed significant gains with the BMP intake. None of the three products performed anywhere near the manufacturers' claims.

 

Funny how Eurpoean Car's Dyno results fly in the face of everyone elses be it Randy or MCSHP.

Anyone who has owned the Magnaflow will attest to the fact that it most certainly does make power. My BORLA makes power compared to stock and when I had the Magnaflow on the car it certainly made more power than the Borla.

Makes you wonder what EC had to do to get those results.

 

>>Anyone else read the testing in the new EC where they dyno'ed the Magnaflow and Supersprint cat-backs and recorded nearly zero gain? Interestingly, they showed significant gains with the BMP intake. None of the three products performed anywhere near the manufacturers' claims.

Tuners overstating their HP gains? NAh, couldn't be


Interesting though, nonetheless.

 

My testing showed very little gain for the Magnaflow as well:



Where's the big gains?

 

Your base run has the HP listed 159? Is that at the crank or at the wheels?

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Happy Motoring!

 

That's whp. In that test, the baseline was Helix/P&D 15% Pulley, MTH chip. The Test added the Magnaflow exhaust. No other changes. Same dyno, same day, same car.

Here's a stock baseline compared with Helix/P&D 15% Pulley, MTH chip.



There's a 2whp difference between the two Helix/P&D 15% Pulley, MTH chip runs, but they were done a few weeks apart.

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1/4 Mile Database

 

>>That's whp. In that test, the baseline was Helix/P&D 15% Pulley, MTH chip. The Test added the Magnaflow exhaust. No other changes. Same dyno, same day, same car.

I think most manufactures who show dyno reports, only test with a base model then with that base model with their hop-up.

So the HP gains are the fullest they can be.

Because, as I've been told, adding some hop-ups can really help an engine out, then subsequent hop-ups overlap in where the help was going to be so they don't help out as much as when the subsequent hop-up was added without any of the prior ones being there.

 

I agree, and I never dyno'ed the Magnaflow while stock. But, EC did. And they saw very little gains, just as I saw with my pullied chipped car.

 

Regardless of HP numbers, the Magnaflow sounds SWEET!

 

It sure does ... it gives the car El Cajones Grandes:

 

you hp monkeys need to look more at the shape and magnitude of the torque curve to assess results. A small upward blip at high rpm can give a misleading high hp; a high torque reading at lower rpms will not necessarily give a large max hp number, but will develop very desireable performance.

 

>>you hp monkeys

Actually I'm a torque monkey thanks to many posts here on the MCO!!!

 

Andy, a 6hp gain after already doing pulley and chip is not that bad. You would see higher numbers if you only added the Magna.

I've dyno tested the Quicksilver and Magna back to back on my car. The Magna made more power than the Quick, but not much. But point is, it made power...somewhere in the 13hp realm if I remember correctly. Guess I need to scrape up those dyno charts....

But zero? I think the dyno is broken.

R

 

most modern car exhausts are very efficient. Usually if anything you'd see more power with an exhaust as you add more mods, for example Andy's car has the pulley which is cramming more into the engine therefore it should need an exhaust moreso to get all that air out.

I want to read the article though...but my damn magazine wasn't there yet last time i checked
Mike

 

>>most modern car exhausts are very efficient. Usually if anything you'd see more power with an exhaust as you add more mods, for example Andy's car has the pulley which is cramming more into the engine therefore it should need an exhaust moreso to get all that air out.
>>


I talked to a supposed "expert" and he said the opposite (which seems to hold true at least for the MCS). He said that since all this air is being forced in by the supercharger, the forced air will literally "force itself out". In other words, it doesn't matter if the exhaust isn't that efficient with flow. All the new air being pumped in constantly by the supercharger will already optimize flow. The exhausts have to leave fast b/c new air is being forced in under pressure. Makes sense to me but I'm definitely no expert.

 

so it added 5+ wheel hp to the pulley and chip? Thats good. Testing is always done with flywheel hp. Ofcourse the hp isnt going to be as high with other mods this is something we know already.

 

Umm no. The magnaflow for instance creates backpressure and gives more hp. The more you mod a car the more you want a less restrictive exhaust, one that allows the increased airflow to exit smoothly

 

>>Umm no. The magnaflow for instance creates backpressure and gives more hp. The more you mod a car the more you want a less restrictive exhaust, one that allows the increased airflow to exit smoothly >>>


How does it CREATE backpressure if the pipe is 2 1/2 inches while all the other exhausts available are 2 1/4"??? Not doubting you, just trying to understand...

 

>>so it added 5+ wheel hp to the pulley and chip? Thats good. Testing is always done with flywheel hp. Ofcourse the hp isnt going to be as high with other mods this is something we know already.

Stop talking like you know about these things cause you obviously don't know your *** from your elbow. Testing is never done with flywheel HP, cause quite frankly noone knows the exact flywheel HP after they dyno, it's something that can oinly be ASSumed since noone know's the exact drivetrain loss. So unless you're pulling your motor all the time and using an actual engine brake then you use wheel HP.

Also a aftermakret is creates less backpressure not more. If it created more back pressure then you'd theoretically have less power at the top end because it would be harder for spent exhaust gaes to escape the combustion chamber. The easier it is for those gasses to get out the more power you can make to a certain degree.
Mike

 

The Magnaflow and Quicksilver make more backpressure than is needed, when you have several mods like chip, pulley, throttle body, intake, etc. THis is just what i have read, not what i have come up with myself. This is why you are starting to see people taking the battery box out and making an exhaust that can go straight back, isnt it?

Also aren't cars hp taken from the flywheel? I thought they were. I am not an expert by any means, you could just correct me if i am wrong, no need to get crazy.

 

>>Also aren't cars hp taken from the flywheel? I thought they were.

When you say this do you mean the HP numbers provided by the manufacturer of the car? If so, then yes they are taken at the crank.

 

>>Andy, a 6hp gain after already doing pulley and chip is not that bad. You would see higher numbers if you only added the Magna.
>>R


This makes sense and also explains why, 2 weeks after I had the pulley done, when I put the Stebro exhaust on I really didn't feel any noticable "seat of the pants" gain. Sounds sweet though, loud at WOT but doesn't droan as bad on the hwy like the MFlow.

 

I don't think that makes sense at all.