Mods = Horsepower = Hrmm

[chow]

One question for you all..

We all know that the 3.5SE is using the same engine as the 350Z and g35 but, why do those platforms seem to gain more HP per mod?

For instance, take the Stillen exhaust for the G35, i read in a magazine that it gave it 12 WHP. (Some tuner magazine where they ordered the stillen exhaust and dynoed it, so it isnt bs). The stillen or other air intakes claim a gain of upwards of 10+ whp for the G35 as well. (Im assuming because of the dual intakes the car is running)

So why do our cars, the 3.5's not gain as much as them? Im estimating that my intake puts me up 1-2 whp, as i dont even really notice it. The exhaust i just ordered probably another 2-3 whp. Whats wrong with our engines?!

And why dont the exhaust manufacturers release a dyno with their products?!?!

PS: Im going to track my car before the installation of the exhaust to see if it actually gives me more power, low /high rpm.

[leifab]

I believe a lot of it has to do with shady dyno practices. You can get numbers to "say" alot under controlled environments...whether it be by dyno'ing the base run without air flowing...to get a lower base, or not properly warming up the car before dyno'ing with mods...etc.

[08Coupe]

Alot of it is in the tune, if the tune is more agressive more intake and exhaust flow will show some good numbers. Also if a factory intake is Very restrictive then a "cold air intake" will show nice gains. A hot air short intake is not my idea of a performance addition.lol Really if you want a high powered tunable car you need a car that can be tuned! Then you will optimize your mods and get much greater gains..

[racingtiger03]

I doubt the G35 cars gain as much as those you listed. Head over to G35driver.com and ask them. Theyll flat out tell you that NA bolt on mods are worthless unless you want the sound. (I was originally looking for a G35 before i bought the A/C so I did a bit of research haha!) Either way though. FI seems to be the only thing to get a response out of these engines. They are pretty much tapped out from the factory. I mean think about it really.. 175 HP from a 4 cyl 2.5 and 270 from a 3.5 V6, as for the I4 motorcycles put that out with a 1000cc engine, but have easily 5x the performance orientation from the factory built for the racetrack indeed. for the V6... well, my Z28 was rated at 275HP stock with a 5.7 V8 *shrug*. I think nissan did quite the job putting these engines together to get the most HP possible without affecting Daily Driveability, and keeping things respectable.

[Canadian Coupe]

F ...... W ...... D......

[chow]

FWD has nothing to do with it. Infact i think that more power would reach FWD wheels then would RWD. This is cause theres less parts to lose energy to.But i could be wrong.

Anyways.. I guess bolt ons really dont work on our cars.. o well.. FI is to much of a risk and not practical.. Also.. with gas prices this high.. whos going to go FI?

[TheBourneAltimatum]

the VQHR has more aggressive cams, has daul throttle bodies and is basically tuned to achieve the most power...and the Y-pipe for the 3.5 altima licks balls also...Racingline is working on a Y-Pipe for the sedan and it should give the car a lot of power

[dangeris]

...and the Y-pipe for the 3.5 altima licks balls also...

ROTFLMAO....NICE!!! But what kind of balls? Schweaty Balls?

[Mr. Music]

Simple "bolt on" parts will mostly never show much of a power gain on a dyno (including your butt dyno). Now, the bolt on parts accompanied with a custom computer tune will show better numbers. Also, forced induction isn't the only option to make lots of power, however, it is usually the easiest. You can get plenty of power with higher compression pistons, stronger and more aggressive internals and a good tune.

[08Coupe]

Another thing to consider is the VQ 3.5 has been around for awhile and nissan has been getting more and more power out of it every year, there may not be much left to gain (anotherwords its set-up is almost optimum) It takes more aggressive cams and tune, 2 intakes, hi-flow eshaust to for 300 crank in the Z. Probably why Nissan went to a 3.7 IMO

Im only talking N/A here not forced induction

[Cali 2 Balti G]

I believe a lot of it has to do with shady dyno practices. You can get numbers to "say" alot under controlled environments...whether it be by dyno'ing the base run without air flowing...to get a lower base, or not properly warming up the car before dyno'ing with mods...etc.

That wouldn't explain the difference between G gains, Z gains and AC gains. This type of shadiness as you call it can be applied to any of the above cars so ........

In general it seems that FWD does make a difference in terms of the postion of the intake on the AC (towards the rear of the engine compartment) whereas the G and Z are postioned towards the front of the car. Also the AC intake is directly above the transmission - not sure is that would impede airflow. Also because of the FWD packaging - drive wheels, engine, transmission all sharing the same compartment - leaves no room for a CAI - or an intake that pulls from the front of th car. Does stillen make an intake for the AC?

There are many mods for the Gs and Zs that have been out for some time now and have proven to be effective. It seems relatively easy to add 20 plus HP t the wheels with combinations of WAI, CAI, Intake Spacers,Intake Plenums, Exhausts. etc You would think there would somewhat of a product trickle down of existing (easy-cheap for manufacturers) or newly developed (much more costly for mannufacturers) parts for the AC.

I have replaced my intake with the Pop Charger Z tube combo - the popcharger is a WAI and the Z tube is the actual Nissan 350Z intake tube. The Z tube alone I understand accounts for much of the HP difference between the G and Z engines from the factory. Stillen and other manus. make similiar intakes with similiar performance claims.

Exhausts - I think the G and the Z exhausts are more split compared to the AC. Not sure if there is a power implication here - but consider the fact that Borla only made an axle back for the AC though it seems they forgot to back out the catback price .

Modified by Cali 2 Balti G at 6:06 AM 4/25/2008

Modified by Cali 2 Balti G at 6:07 AM 4/25/2008
Modified by Cali 2 Balti G at 6:59 AM 4/25/2008