I had a loaner G35 today from the dealer while they did my 15K scheduled services. Driving the loaner I realized that my car is actually slower than the G35, especially at lower rpms. I'm running JWTs, Berk HFCs, Motordyne XYZ - pipe, Tanabe Medallion. I've reset the ECU after each mod. I have read elsewhere on the forum that a CAI + high flow exhaust causes power loss at lower rpms. My car just totally feels like it hesitates from a dead stop. If I dump the gas pedal seems like it takes a second or two before the engine responds. So basically I've spent about $1500 to go slower. Anybody got any ideas on this??

 

have you gotten a tune since you installed everything?

 

our car is basically already built really well so most mod for our cars get maybe 1-5 hp out everything. I think mods for our car are basically for looks and sound unless you get a custom tune. Get a custom tune to see if it feels faster or get Cobb AP

 

no tune since the mods. been considering the Cobb AP, but that's another $700. Would really like some warm fuzzy that that would address this problem. Who can do a custom tune? Dealer?

 

Aw, this thread is depressing.

 

i feel like my intakes helped me out alot.i had injen CAI i took them of and the car feels slower...im stock intakes now and it sucks

 

hate to break it to you ufo, but most mods that increase an engine's breathing to improve hp at high rpm usually always results in a loss of hp at lower rpm. naturally aspirated engines do need some back pressure in the exhaust.

 

^+1 banshee

i would question anything about mods making the car any slower...granted our cars are AMAZINGLY built machines and if you have a ton of mods a tune is prob in order, but i really dont think it will make your car any slower. the gains will just be few and far between without a tune

 

Intakes w/o a tune has shown loss of torque in the low end on the G. Not sure about your particulars ones, but exhaust mods generally lose torque on the low rpm range also. You gain those back on the top end, though some ppl would not sacrifice low end torque (where they usually do their driving) for top end power, esp. when our G has very lil torque to begin with .

Do a search on technosquare, they do custom tune, but they are located in torrance, SoCal, and a tune is $750. If you're not in socal, maybe AP is the way to go, or you can mail Technosquare your ecu . . .

Edit: chillinuf beat me to it already . . . haha . ..

 

you're running lean...get a tune from cobb or technosquare.

my 350Z with plenum and exhuast had the same gains as my plenum, intake, exhaust, headers, and pulley combo...why? I was running too lean and the ecu was pulling fuel. richen it up and you'll see the power.

 

Get the Stillen Gen 3 intake or Injen Cai to get that power back on lower RPMS
The JWT shines at the higher RPM.

Getting some customized mid-pipes would probably help at lower RPMs too.

 

Get a tune..

 

I'm depressed.

 

Poll: Will Cobb AP solve this problem? Stated more specifically, will Cobb AP restore power at low RPMs (say below 4K) that has been lost with high flow intake and exhaust?

 

I've been trying to bite my tongue but I definitely need to chime in here.

First, this is a high rev car. The G37 has the ~330hp because it has a long flat torque curve. The point is, who cares if you lose a little (and seriously, it's a small amount, look at any "after" dyno) on the bolt on mods. If your driving this car under 2500rpm (which is where you'll see any minimal loss in torque), you need a driving lesson. This car lives and breaths at >5000rpm.

You won't see a loss in power 3k-4krpm, but, yes, the gains may be minimal. Any dyno you see with bolt on mods i.e, HFC, catback, and especially a CAI, most if not all of the power is on the top end. That is what the G37 loves!