I dyno'd my Maxima...max torque was 219ftlbs....the 350Z doesn't have much more according to this...Max HP for my Maxima was 204...Nissan is having some serious driveline loss issues....

350Z Dyno

-vq

 

INJEN dynos =

First, it's done in 3rd gear which has a ratio of 1.62:1, whereas it should have been done in 5th gear which has a PERFECT 1:1 ratio.

Second, I've seen several other dynos that show much higher.

Third, I believe it has aftermarket rims, since I don't think the 350Z comes with 18x10s in the rear.

I'm not flaming, I just wouldn't take that dyno for 100% accuracy, ESPECIALLY since they did it in the wrong gear which should have multiplied torque so the baseline of 219.7tq is WAY way off.

 

that's all I needed to see... it makes sense to them to use the dyno that shows their product in the best light, but if it's not "standard practice" then it's kinda crappy.

 

 

I believe you mean 4th on a 6 speed. I also agree that you can't use the Injen dyno as a base.

 

I saw a 2k2 manual do 224hp, 231tq. This was with a Frankencar intake and thats it. Now those are good #'s.

Jason

 

According to Car&Driver(350Z):
Gear--- Ratio--- Mph/1000rpm--- Max Test Speed
-----------------------------------------------------------
1------- 3.79-------- 5.7------------ 38mph(6600rpm)
2------- 2.32-------- 9.4------------ 62mph(6600rpm)
3------- 1.62-------- 13.4----------- 88mph(6600rpm)
4------- 1.27-------- 17.1---------- 113mph(6600rpm)
5------- 1.00-------- 21.7---------- 143mph(6600rpm)
6------- 0.79-------- 27.4---------- 156mph(5700rpm)

According to Road&Track(350Z):
Gear -- Ratio -- Overall Ratio -- Max Test Speed
--------------------------------------------------------
1------- 3.79------13.42:1 ---------38mph(6600rpm)
2------- 2.32-------8.22:1 ---------61mph(6600rpm)
3------- 1.62-------5.74:1 ---------88mph(6600rpm)
4------- 1.27-------4.50:1 --------112mph(6600rpm)
5------- 1.00-------3.54:1 --------142mph(6600rpm)
6------- 0.79-------2.81:1 --------155mph(5700rpm Electronically limited)

According to Road&Track(G35):
Gear -- Ratio -- Overall Ratio -- Max Test Speed
--------------------------------------------------------
1------- 3.79------13.42:1 ---------38mph(6600rpm)
2------- 2.32-------8.22:1 ---------61mph(6600rpm)
3------- 1.62-------5.74:1 ---------88mph(6600rpm)
4------- 1.27-------4.50:1 --------112mph(6600rpm)
5------- 1.00-------3.54:1 --------142mph(6600rpm)
6------- 0.79-------2.81:1 --------155mph(5700rpm Electronically limited)

 

Dont know about you - but I would be a little scared going 142mph with a couple of straps holding me in place. I have a feeling there will not be to many 5th gear dyno pulls. Who knows though

Brian

 

I shouldn't have assumed the gearing would be the same between the maxima's and the z's.

 

Yeah, I figured you were referring to the 6spd Maxima instead.

It's all good though.

 

Hey Ice,
you wouldn't happen to have Max 6 sp gear ratio chart readily available for posting here, would you?


Also, which 6 sp has better gearing for speed, Max or 350Z? How about better acceleration?

 

Nope, but it's just a simple search away.

Those questions are BEST answered by SteVTEC. PM him.

 

As it turns out from talking to some tuners on different forums and reading a bunch of dyno tech articles, the gear that's closest to 1.00:1 is NOT always the best gear to dyno in.

When you get the wheels up to 143 mph on the dyno you're having to accelerate for a long period of time and you don't always get the most consistent results. On top of that, some dyno's have a speed limit which may or may not be up to what your car will do in the 1.00:1 gear. I know for a fact that not all dynos will make accurate measurements up to 140-ish mph.

Plus some cars run very short gearing but a very tall final drive. Others are just the opposite and run extremely tall gearing but a very short final drive. BMW, and Toyota are both now using 1.00:1 "overdrive" gears, but then very tall final drive ratios in the high 2.xx or low 3.xx range.

A BMW 330i's 5th gear is 1.00:1 with a very tall 2.93:1 final drive. That sucker will go all the way up to 150 mph in 5th. Would it really be a good test of an engine having that sucker push all the way up to 150 mph? It'd probably get considerably heat soaked and not even give very accurate results by the time it got up that high. So on that car, and cars like the Z, a 3rd or 4th gear pull would probably give more accurate and consistent results where the car only has to pull up into the low-100 mph range.


The horsepower measurement on the dyno will come out at the same levels despite different gears because of how the torque is measured in relation to the RPM and the speed.


So what you want is a gear that will have the engine at WOT and place a considerable load on the engine, but not one so short that it's at redline in just a few seconds, and not so long that the engine is laboring, heatsoaking, and losing considerable power by the time it finally gets up to high speeds on the load. It all depends on the specific car setup, and how much power you're putting down to the wheels.