Originally Posted by extrashaky (Post 2940922)

I wouldn't believe it without actual dyno numbers. A change in sound can do a lot of weird things to how you perceive a car's performance. Sometimes it "feels" faster when it really isn't. Yours probably sounds like it should come off the line faster than your visual cues tell you.

Originally Posted by extrashaky (Post 2940922)

I wouldn't believe it without actual dyno numbers. A change in sound can do a lot of weird things to how you perceive a car's performance. Sometimes it "feels" faster when it really isn't. Yours probably sounds like it should come off the line faster than your visual cues tell you.

Originally Posted by Last Lemming Alive (Post 2940881)

I just installed a Perrin 2.5" resonated cat back. I've been driving it around a week or so and I've noticed my low end torque is gone. It doesn't zip off the line anymore. It smooths out the power band nicely and sounds a bit better, but there is definitely a loss of low end torque.

I see I have two choices: 1) rinstall the OEM pipes. 2) add another upgrade to gain it back.

If I go number 2, which power mod will be the most economical to get the job done. I just want to keep the higher rpm gains and just give. Ack the low end torque I lost.

Originally Posted by wparsons (Post 2941427)

I definitely didn't lose any low end torque with my Perrin 2.5" exhaust (resonated).

OP, did it happen immediately, or took some time? Any chance it's bad gas or anything else? Did you reset the ECU when you installed it? Anytime the ECU is reset (or flashed), the throttle response is brutal for a couple days and it feels like it has lost all low end power.

Originally Posted by humfrz (Post 2941584)

Hi ya, Last Lemming Alive ...... :)

Have you had any other power mods done to your car .. ??

Did you do anything else, drivetrain wise, when you changed the exhaust .. ??

As mentioned up above, have you changed your source/type of gas ..??

(has anyone but you put gas in your car ...... like regular grade..??)

I feel there is something else working here, other than a change in the muffler.

:

humfrz

Originally Posted by Last Lemming Alive (Post 2941663)

This was my only mod. And the gaskin the tank was the same for the Perrin and the OEM. It wasn't a net loss, I did gain mid range and top end power, but I lost a bit of low end - say 7-10 ft lbs.

Originally Posted by humfrz (Post 2941755)

hmmmm......let's see ...... it looks like the resonated mid pipes are about the same ...... or are they .. ??

If so, that just leaves the muffler being the sole difference.

According to the below graph, as best as I can read it, the Perrin system should allow the engine to develop more torque all along the power band (with the exception of that one little peak and a slight edge in the torque dip).

So, what's going on with you and your car .... ??

:iono:


humfrz

Originally Posted by Last Lemming Alive (Post 2940907)

In my experience on a NA engine when you typically gain on the top end you sacrafice on the low end and vice versa. This isn't iron clad of course there are exceptions. I thought this might be one when I looked at the dyno on perrins website. It showed no loss of torque at low rpm, but to me the loss is evident.

As far as how you loose low end power, if you just bolt on a more free flowing exhaust you will gain top end, but the reduction in back pressure will typically loose you low end torque. A tune would most like help with reducing the loss I imagine.

HP is meaningless for the most part. For a street car it's all about torque.

Originally Posted by Last Lemming Alive (Post 2941663)

This was my only mod. And the gaskin the tank was the same for the Perrin and the OEM. It wasn't a net loss, I did gain mid range and top end power, but I lost a bit of low end - say 7-10 ft lbs.