Power Loss

A&Q about 350Z
Q:



I just installed my new borla true dual exhaust system on my 350z..
I donít know if itís just me but it feels like I lost some power..
I am thinking about removing it and installing a nismo instead.. since itís more like the stock exhaust the 350z comes with..
I already have someone that will buy the borla off me so I am thinking with that cash I will buy a nismo instead.
What do you all think?
Or should I just leave it stock?


A:



its possible you could have lost a bit in the low end, but overall you shouldnt lose power. Have you really pushed the car yet, like ran it up to or near redline? the peak power claim on an exhaust may not come til 5-6krpm, im not sure what is for the borla. Just an exhaust though, any exhaust, isnt really gonna give you a noticeable power increase. its nearly impossible to feel an impact of 8-10hp. I would go with whatever exhaust has the sound and look that you like.

---------------------
03 CS Touring
VIN #189


A:



it's probably your imagination. did you check for leaks? maybe you forgot to install the gaskets or didn't tighten the bolts enough?

_____________________________________________
'05 350Z Chrome Silver Touring
'73 240Z


A:



Running premium gas?


A:



Listen to cmcniel. You will lose some torque with a really high flowing exhaust that reduces backpressure (turbo cars get this power back under boost, N/As never really do). Your peak HP might be a bit higher at peak RPM, but your low RPM can lose a bit.


A:



interesting

_____________________________________________
'05 350Z Chrome Silver Touring
'73 240Z


A:



I guess the NISMO exhaust system is the best option?!



_____________________________________________
'04 Nismo 350Z Redline Touring (NISMO cat back exhaust, Injen Intake, 19 Nismo LMGT4)
'03 C32 AMG


A:



>Small torque loss at 2800 rpm.

Yeah, that's the kind of change you'll see. This might be noticed more in start/stop traffic.


A:



I feel like I gained about 8.1 horsepower and 7.3 ft/lbs torque, peak values of course.

It also seems like my horsepower and torque increase starting around 3000 rpm to redline. I feel like I've lost a little horsepower and torque below 1800 rpm.

_____________________________________________
'05 350Z Chrome Silver Touring
'73 240Z


A:



You need to re-flash the ICU.

(sorry I meant ECU).

-Zanioed '03 Le Mans Sunset Touring Coupe w/ Nav.



Post Edited (Oct 1, 7:14pm)


A:



How do you re-flash the ICU ? Do you need to take to the dealer for that or any shop ?

the Juiceman

- '05 Redline Enth.
- AEM Air Intake
- Injen SES TD Titanium Tips


A:



You can buy a performance "chip" flash, aftermarket and about $200 - 400. This gives you a broad spectrum ECU reflash which accounts for the additional flow found with an aftermarket exhaust or intake. This is the most common and easiest way, and it might gain you 10-15 HP. (assuming you have the right mods.) Just remember that any change to your ECU will void warranty and you may or may not be able to pass emissions.

You can buy a piggyback (there are no stand alones because of our variable cams) ECU which is fully tunable for $800 - $1200 and have a shop dyno tune your car. This would most likely give you 25 HP with the right mods.

The dealership will not reflash your ECU, unless its a recall issue, required for maintanance, or a NISMO product. (I dont know of any.)

06 Lemanz Sunset Track Z
Best car I ever bought.
IHI Turbos comming soon.


A:



"I know if you replace the Honda S2000's exhaust with an exhaust of substantially different pipe lengths and geometries, you can really reduce the power of the engine. In a Sport Compact Car article from earlier this year, a guy put an S2000 engine in a Miata, and when he tried his first exhaust fitting using very large pipe and what would seem to be plenty of flow potential, the engine lost 35 hp. The engineers have tuned that exhaust like mad to make the absolute highest power possible.

With the similiar high output of the VQ35, I would think it's very possible to reduce engine power with an aftermarket exhaust."

Actually, that's not the "whole" story. The original exhausts for the s2k weren't for power increases, mostly weight reduction. The original mugen/toda units had weight savings of about 50lbs and increased midrange for slight top end loss or no gain at all. However, the stock exhaust is hard to improve on with today's high hp n/a applications from the factory.

That being said, the single 70mm exhausts for the s2k are the best bang for the buck bolt-on available, up to 10-15whp throughout the power band. They best units are also titanium and have upwards of 50-60 lbs of weight savings over the stock unit as well.

The lesson learned is not every exhaust, even the very expensive well known ones, are promised to have good gains. However, it just takes some time and *ANY* stock exhaust can be replaced for good gains because performance engineers and the original Nissan ones have different goals in mind, the allowable noise volume as one of those important variables.

19[TT]91
My TT beauty is gone.
2[00]2 Honda 954RR
Suzuki 1200 S; sportscar eater
19[I4]94 Integra GSR Sedan
Long live the Z...



aka SAHTT


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