my bad i meant they detune the sedan.

 

So then why is the sedan still quicker?

 

Really? Where'd you get your information that the sedan is "detuned" at the factory? How much so?

 

well the advertised hp on all cars is crank hp. on the infinit site the g37sedan is 328, g37coupe is 330, ipl is 348.

since crank hp is measured by what the engine does on a stand it doesnt have anything to do with the car itself. the only difference i have been told by a dealer is that they detune the car. but its only 2hp so i hope some sedan lovers dont light their pitch forks over this.

heres the link to the specs on the sedan
2012 Infiniti G25 and G37 Sedan Specs and Options | Infiniti USA Official Site

 

and i was also told thats how ipl got its hp, a more sportier tune and then an ipl cbe but they got 18 hp and 7 tq more as im sure everyone knows

 

So you actually believe that the ECU is intentionally mapped differently on the sedan vs the coupe by Infiniti in such a way as to reduce HP output by 2 HP? Why would a manufacturer take the exact same engine in the same car with 2 different configurations and go to the expense and trouble to "detune" the HP output by only 2 HP?

 

Dang I find this thread really interesting and funny at the same time.

To OP making power on any NA is going to be hard unless you get F/I, so when you gained 50 more hp that is very good.

Also, with times no matter if you have a auto or manual it is about the driver. More for the manual though. Launch is very important.

As for sedan coming under tuned from factory. Once again you can only do so much with a v6 to make power. If you want to know a car that comes under tuned from factory is the BMW 335i. I seen a 335i make 50-60 hp just from a tune (or software update). Reason? Once agan bmw m3 is a N/A V8 and they don't want the 335i to make more power then the m3 out the box.

Also, if you look at the euro specs both sedan and couple have 328 hp. I think the 370 has 328 hp also but I am not sure about that right now. I could be wrong. So the coupe having 330 hp in the U.S could be some kind of marketing option right?

So in all in all OP don't feel bad at all. I am 100% sure most of the people here wish they had some gains like you including myself, and I am sure most of the members here are pretty glad you made some great gains.

 

yea i believe that. what else would make it have 2 less crank hp? all they probably did was add just a little timing theres 2hp.

im not saying the sedans arent sporty but whats more sporty a 4doorg37 or 2doorg37? the 2 door is more sporty to answer my own question. so in the manufacture stance how do you get a sports enthusiast to buy a 2 door when the 4 door makes the same power and as pointed out is lighter...its on the website so all we can do here is speculate and i feel my answer makes sense. they have the same intake exhaust and same engine only place to change power is the tune

 

thanks and i agree, i see your from dallas, i got a fb group with a couple people on it Welcome to Facebook - Log In, Sign Up or Learn More

and the 370z has 330hp not 328. nissan would be shooting themselves in the foot in the luxury version had more crank hp.

 

another reason, people that buy the sedans usually arent buying it for power so to help warranty purpose they might back it off a little on the tune

 

Most likely there is no difference...only what they put in the spec on paper for the consumer.
This has been done in the automotive industry for years...

By they way, most comparisons show the sedan is quicker than the coupe.

 

OK (extra characters)

 

In reality you don't know exactly what you gained since you have no dyno #'s from stock. On top of that you are taking a low # from one dyno and adding the current # from yet another dyno to come up with your +50 whp estimate..


Using your formula of 20% parasitic loss (a widely accepted value in the industry) your 243 whp would net you 292 crank hp (pretty weak for a 330 crank hp rated car) and your 290 would net you approx 359 crank hp which would be a 29 hp gain over stock.
Now we all know that dyno #'s are BS, especially comparing numbers from different dynos..
You ever stop and think about the fact that you may have lost hp with your cat back?? These VQ engines seem to be as fickle as forced induction engines when it comes to making power on the dyno,.. changes in VVTL and ignition timing based on atmospheric conditions have a big effect on the outcome of a dyno pull.
You asked why the IPL is able to get an additional 18 hp from basically a sport exhaust and a tune while those with Uprev and similar mods cannot? You are forgetting that Infiniti holds the keys to the VVTL system which is a powerful tuning tool, others such as Uprev have not gone down the VVTL path which limits their effectiveness.
Bottom line is you more then likely haven't gained 50hp from your bolt on mods. You should be happy with your .6 sec gain in the 1/4 mile, maybe if you were in the left lane the rift between the IPL's time and yours would be greater... so many variables in drag racing.

 

For years the automotive industry have played with hp numbers. In 1987 GM flagship corvette was not there fastest car, it was the Buick Grand National and it was wayyy underrated at 245hp running high 13's stock and high 12's for about $500. Gotta love turbo's.

I highly doubt that Infiniti de-tuned the sedan engine by 2 hp. In fact, when they are manufacturing the engine itself, there's probably no distinction that this engine is for a coupe and that engine is for a sedan. They are interchangeable. Its probably a marketing game kinda like how store items are $4.99 or $9.99. Plus to add to the confusion, I think I heard that the G37 makes and extra 3hp at 60 mph do to ram air effect. So I guess a coupe going 60 is making 5 hp more then a sedan going 59.

 

I do wish Infiniti would underrate their horsepower and torque number like BMW and Audi do. Dyno's of the S4 and 335i are getting crank hp numbers to the wheels. I bet BMW gives a tuned car to motor trend and the other mags when doing the test. The 2013 bmw 335i in motor trend 0-60 was 4.7 and 1/4 at 13.3 stock. That's 300 hp right?