Hey guys, so I've owned my G37s Coupe 6 spd for 6 months now. Coming off a 335i 6 spd. The 335i was obviously faster because it was tuned giving it around 17 psi. And around 400 HP at the crank.it didn't require for you to "gun" it to feel a pretty aggressive pickup even at the stock PSI.....But my question is on my car, seems to get the power I want I have to get it up to at least 5500-6000 RPMs.....Guessing that's how the engine was designed? Torque and HP doesn't kick in at all IMO at 4-5000 RPMS, feels SLOW. When you get on it basically WOT almost hitting the redline, than yeah it feels decently quick and where I want it to be....Now are these engines made for that type of hard load regularly? Because I drive it like that. I coast yeah sure here and there but from dead stop I usually at least get up to 4500-5k in 1st before I get into 2nd....Just curious from others who know this car better than me . Thanks in advance.

 

Its a naturally aspirated 3.7...the power isn't going to come on immediately. I don't know about reving to 5k every time you leave a stop light but if it isn't wot and you are shifting nicely I would think the motor would be fine.

 

Sound's like the car is driving as it was intended. Since it isn't an overboosted turbocharged engine, and is down about 130 HP from what you're comparing it to, it should feel much slower. Look up an untuned, non FI dyno chart of this car and look at the torque curve. It verifies exactly what you're observations are.

Can you rev it wide open every time you get on the throttle? Sure! Is that driving style optimal for prolonged engine life? Of course not.

 

Sorry, but it sounds like you got the wrong car. One of those cases where an extended test drive probably would have been a good idea. And unfortunately these VQs cost a lot to get any significant gains in hp/tq.

 

Yeah I have the same problem with my car. It hesitates for a second or two before it actually accelerates

 

If you decide to keep it, mod it a bit and get it tuned, the throttle logic doesn't actually give you WOT (wide open throttle) lower in the rev range and you can change that with Uprev and I believe ECUTek. It'll never have that low end swell of torque like a 335 (used to own one too) or any other turbo car unless you go forced induction. Naturally aspirated cars make power on revs and displacement. The later 7speed autos can be fairly quick due to gearing but again, nothing like a 400hp 335.

You could always throw on a turbo kit but it ain't cheap.

 

In stock form the turbo 335 has peak torque at 1,400 RPM and the G37 is at 5,200 RPM. This makes the BMW respond much quicker to throttle.

Typically BMW engines don't like to rev out to redline they are more of a "torque engine". The Nissan/Infiniti VQ37engines LOVE to wind out to 7,000+ RPM where peak power is. This is known as a "Horsepower engine" as it makes power by RPM (more combustion events per second). For comparison the 335's peak power is at 5,800 RPM.

Comming from my BMW, it took a while (8 months) to adjust to the different engine. I did like the low RPM torque, but I now really love winding it out to 7,000 RPM as much as I can. AND yes it does not hurt or wear the engine. (according to my 10,000 KM used oil analysis)

The most difficult thing for me was loosing the s-m-o-o-t-h-n-e-s-s of the lovely inline 6. You can not design/build a large V6 t obe a smooth as a inline 6. Wind the engine out and enjoy!

 

Welcome jk315 Just curious, what made you switch?

I think the best bang for your buck if you decide to keep it would be the normal tune, CAI, exhaust with test pipes or HFCs, and swapping the rear gears. It seems like every person on here I have read loves the way the car responds. Maybe a ported intake manifold to finish it off? Yes it would be close to 4k in mods but, more reliable than a boosted engine and with much better acceleration and response than a stock 6MT.

 

I am not sure $4,000 to net 40ish HP is your best bang for the buck. $100 per HP is fairly steep. If you don't like how the G37 responds and find it slow, get something with a large V8 or AWD with a turbo.

 

The change is gearing is over half that, and gearing changes make a huge difference in acceleration. But I definitely agree if you only count HP that would be terrible. 350z with HR engine, slightly different but obviously same concept **** 4.083 Gears/Final Drive Installed**** - MY350Z.COM Forums

 

If I read this correctly for about $2,000 the 4.08 diff will get you 0.3 seconds and 5 mph higher trap speed in the quarter? That is still steep in my book @ $666 per tenth of a second.

Keep in mind the extra real wheel torque will spin the tires much easier making a good launch that much harder. Sticky rubber will be required to use full throttle in first with this diff and that is more money. (unless you already have very sticky performance tires on already) With my exhaust & intake on my traction control kicks in when at WOT in first gear. I like it, but is does slow you down.

I am sure the car feels great and does pull very hard but how often can use all of that on the street before you go to jail? I am not trying to poop on this mod, any mod you like is a great mod. BUT if you look at the numbers (which may not matter if you want it) it is an expensive mod for the benefit.

 

Well, I had an 08 sedan and it was very well done IMO, m3 rep front and rear bumpers, and many other nice mods, a lady hit me and totaled it. So I needed a car asap and for some reason in my mind I felt if I got another 335i I would constantly compare it to my refined one that just got wrecked. And would cost me an easy $6k to get to look and drive like it. And I didn't have an extra $6k to dump into a new car, just enough to get another stock car with a $3k down payment....So it was either take the stock bmw and work at it over the next year to get it where it was or go with a whole new platform.......Only pro's in the G37s is the cockpit and the interior is much more updated and modern than the outdated bmw dash and interior IMO....

 

The quarter mile times was a surprise for me because its going to lower top speed, increasing acceleration instead so its mainly going to be noticeable on the streets for aggressive driving like OP is wanting. With Pilot super sports or Potenza S04s I am sure you would get enough grip, I have a hard time sliding the back end my car out with my S04s with VDC off.

I know its not cheap, but it is still half the price of supercharging or turbo, and is the best thing besides that. From what I have read (take it with a grain of salt) 0-60 times are mid 4s with that gearing.

Every mod for our car is expensive lol Exhaust is pretty much $100/hp. If he likes the G and wants it to be a lot more responsive and aggressive then his options are either forced induction and or gear swaps, out of those two the gears are a 1/4 of the cost.

https://www.myg37.com/forums/engine-...oh-my-god.html