I think we're lacking in the technical dept. on this here

 

I would guess that the differences would be in the ECU. If the cars have the same components and same restrictions, then the same parts which would eliminate those restrictions should produce similar, if not the same gains.

I would gander that the 370Z has a more aggressively tuned ECU than the G37 because its marketed as a sports car whereas the G37 is more of a lux sports car.

Ive driven both cars and I feel that when you floor it in the G37, it has more of a ramp-up than the 370Z did, so I attributed that to a more luxury/smoothly tuned ECU vs a more sporty in the 370Z.

 

You see, I already thought of those possibilities and the following is what is continues to keep me in the blue.

In regards to the factory tuning of both cars. We can tell out the box that the 370Z is tuned slightly differently based on the HP rating. Sure it's only 2 HP difference but the real difference is in the power band and the way the power is produced. Now based on my logic this should not necessarily effect the way that both cars show gains from comparable mods.. am I wrong?

Also, your actual real life comparison of driving both cars is null because the 370Z weighs 3314lbs fully loaded where as the G37 weighs 3600lbs+ I dont think you can truly judge your seat of the pants differences accurately with that kind of a weight difference.

 

Everyone assumes the engines are the same, but do we know 100% that they're identical?

If the exhaust was different, then the torque would be different as well, but the torque peak is the same measurement at the same RPM, while the HP peak on the Z is higher than the G at the same RPM.

Anyone know if the engines are Identical?

 

Am I missing something here? There's a guy on this board who's dynoed 296 with Just HFC's: https://www.myg37.com/forums/engine-...o-results.html.

AFAIK, the engines are the same. I think maybe the conditions (temps, etc.) are what are the cause of such large variances. The 304whp from the Z posted on this thread isn't far off from the 296... the F.I. could just be designed better...

???

 

im doing an engine swap.

 

Its not just the tune and the power band, its every sensor that measures anything which inputs to the ECU and how the ECU reads and reacts to those measurements. The cars are very similar, but if there is a slight difference in the intakes, then MAF sensors would be slightly differently calibrated, and therefore aftermarket intakes might produce slightly different results. Same with the exhaust. While the cars are very similar, they arent identical. Theres what, an 8 inch difference in the wheelbase and a 10 inch difference in length or something like that? Exhaust length might be different, the bends might not be identical, and the location of sensors might not be identical. Also, their calibration and readings might not be the same due to very slight differences in the exhaust. Same with their headers, cats, mufflers, etc. While I think most of the parts may be very similar, if they arent identical, they can produce slightly different results.

It also could be all in the programming of the ECU and the mapping.... like how the ECU reacts to changes in different readings.

All of those slight differences could lead towards restrictions. We see how different intakes all designed for this car and all might be very very similar can produce up to 5-10 hp differences in results, so its very possible that very slight differences in the design of the 370z vs. g37 could lead to 5-10 hp in different restrictions which aftermarket products can get rid of. I mean how could 5 different SRI's produce different hp results and a handful of CAI's do the same. Very slight differences in the design and bends and locations, which could be the same if the G37 and 370z arent identical.

I wasnt talking about pure speed and acceleration, I was talking about how the power was delivered. There is a lag time which can differ from car to car. When you fully floor the pedal, it might take a second before you feel power delivery. Thats not quantifying how much power was delivered, its just talking about the time delay of the electronics to deliver the power and how the power was delivered. On the 370z, I felt it was more instantaneous, which led to a jerkier, more sportier motion and on the G37 I felt it had a little more ramp up to eliminate the jerkyness, which is more of a luxurious, refined, style.


*And a disclaimer, this is all pure conjecture and guessing on my part as Im still pretty new to this car and havent begun to mod the intake or exhaust and learn about it..... and since I dont own a 370z and only test drove one when car shopping, its pure guessing based on a test drive.

 

it's got to be the ecu if the engines are the same. just wait for an aggressive tune and exhaust cams. people will be making 350-370whp.

 

I made 325 whp yesterday.I wnet in putting dowm 310 whp.I have fi cat back,hfc's,gen 3 stillen.

Big difference in throttle response,car is mcuh smoother than before.

 

u have a G37 or 370z?

 

lol for now we just gotta keep dreaming

 

The stock tunes are probably different. I just posted about the throttle lag in my car. The 350Z probably has has more aggressive throttle tip-in and slightly more spark timing advancement. Both of these things will make the car feel more responsive and add a bit of power.

 

I think someone should release a Mechanical Drive kit for our cars rather than the lame drive-by-wire to start with, then with a simple tune we can have her as aggressive as we want

 

I have a g37S 5peed automatic.

Fi cat back/fI H.F.C.'S/Stillen stage 3.

I had cobb installed with stage 2 map, but for some reason the car responded much better with the stock map.

1st pull 310WHP.
2nd pull 305WHP.
3RD PULL 308WHP.

AFTER REMOVING COBB STAGE 2 & REINSTALLING BACK TO STOCK MAP.

1ST PULL 318WHP
2ND PULL 315WHP.
3RD PULL 325WHP.

 

maybe its because the Z's wheelbase is shorter, thus making the exhaust shorter? And that way it affects the engine or something. or maybe i'm just rambling.