Questions about the Greedy Ti-C exhaust

[hittindabong]

will the greddy Ti-C exhaust make me loose power on my 370z if i dont turbo it? right now i have intake an hfc. this exhuast is 2.75 inches im wondering if it will make me loose power rather than make it becuase its to big. if anyone is using it or knows about it can u help me?

[Knives]

You might have some gains on the high end, but you will definitely feel a noticeable loss in power low-end because of less back pressure.

Why would you go with that exhaust if you don't plan on going turbo? Just wondering? There are plenty of great exhausts out there.

[JoeD]

Originally Posted by Knives

You might have some gains on the high end, but you will definitely feel a noticeable loss in power low-end because of less back pressure.

I doubt it. Low-RPM loss of torque is completely blown out of proportion in situations where there is "not enough backpressure." Take a look at charts of test-pipes vs. an otherwise stock car, for example...the reduction in backpressure of cats vs. no-cats is much greater than a 2.75" aftermarket cat-back vs. a 2.5".

A GReddy Ti-C on a stock car will still make more low-end torque than a stock car. It just might make one or two lb-ft of torque in low-RPMs vs. a car with perhaps any other cat-back. Of course, if we are assuming a loss of torque down low with no evidence to back it up, it's safe to say that it will make up for it at the top-end on the same premise.

Originally Posted by Knives

Why would you go with that exhaust if you don't plan on going turbo? Just wondering? There are plenty of great exhausts out there.

I don't plan on "going turbo" as many dreamers do, yet the Ti-C is my choice of exhaust thus far. It's 2.75" vs. 2.5" providing more flow and features titanium mufflers. It's presumably lighter than the other offerings from all the other tuner-shops and it looks better then the others, to boot.

[Knives]

Well, i don't think it is "completely blown out of proportion". Gas will expand to fill a space. So, a larger diameter exhaust will result in exhaust gases expanding to fill the area, and subsequently cooling faster as it spreads out. Cooler air is more dense, meaning too rapid a cooldown will rob you of volume expansion (gas expands when heated). Volume expansion is a driver in pushing exhaust gases out of your car as it moves toward the lower pressure found at the exhaust tips. So, a drop in expansion will slow the gases leaving the exhaust, robbing you of power low-end. It is not as much of a problem the higher you go on the RPM band because the gases are heated to a higher temperature, lessening the cooldown effect.

There is also a member on another thread on here who installed the GTM 3" exhaust (its not 2.75", but it gets the points across) as he plans to install a TT. He himself said he felt a little less power low-end.

I never said it wouldn't "make up for it at the top-end on the same premise". As I stated above, he will be fine the higher the rpm's.

[hittindabong]

well i like that exhaust alot better than any other exhaust on the market and thats at a reasonable price.. i do have high flow cats an intake so with that exhaust im wondering if i will loose a little power..listening from what u are saying i will gain it back top end?? or should i do a 2.5 exhaust??? what do u think is better in my stiuation

[zman1910]

I've only had Greddy exhausts on my cars. I don't think I'll ever change to be frank. 2.75 in isn't all that big. It's perfect for those that are contemplating TT's down the line or that just simply want a nice true dual exhaust on a NA car. 3" exhaust would def be overkill but I think this is right where I'd want to be. Nice to have options in terms of which way I'd want to go on a vehicle.

As someone else stated above I doubt you will lose much if any power down low.....but your top end will most definitely improve. In fact don't be surprised to if you pick up a couple of ponies down low as well. This whole backpressure talk has been going on for a while and has made for great debates within car communities.....but in a 2.75 in exhaust(mated to 3.7L) I wouldn't worry about it too much.

Greddy makes great quality parts and prices them perfectly. Not to mention I've never been disappointed in sound quality.

[Knives]

Originally Posted by hittindabong

well i like that exhaust alot better than any other exhaust on the market and thats at a reasonable price.. i do have high flow cats an intake so with that exhaust im wondering if i will loose a little power..listening from what u are saying i will gain it back top end?? or should i do a 2.5 exhaust??? what do u think is better in my stiuation

I do agree with you and the other poster, I think it is a nice looking exhaust.

Low-end should def be better than a 3" diameter, but you just won't get as much as a 2.5" and you might (I stress might) lose out compared to stock.

But, you should most certainly see some nice gains mid to high-end. And in the end, that's what counts.