cupcar

iTrader: (1)

A friend pointed out to me that the nissannews.com site had a media site called "The 35 days of the Z" which I can't find any longer. The 35th day of the media presentation listed the Track and Anniversary Z engine changes, written down by my friend:

1- strengthened connecting rods and bolts
2- double-mass crank pulley
3- strengthened valve springs
4- revised shape of the piston head
5- new camshaft profile
6- remapped ECM
7- addition of valve timing control to the exhaust cam
8- modified intake w/ shorter and wider runners
9- revised oil pan baffling and more

zluver

if the gearing of the transmission has not changed, there should not be a significant difference in performance, but the track engine should accelerate the car faster at higher rpms than the 287 version. Even though the track version gives up peak torque, it holds the torque level for longer in the rpm range with less drop off. 300 hp at 6400rpm translates to 246 lbs torque. The other engine, which has slightly less hp 6400rpm, est. 285, is only making 235 lbs torque. Overall the torque curve for the new engine should be flatter and last longer, meaning it should accelerate harder.

cupcar

iTrader: (1)

zluver is rite on.

I think the car will be a lot more fun to drive with the Track engine.

Too bad the changes include the pistons and connecting rods otherwise the rest would be within reach as a mod.

SR20DEN

iTrader: (2)

And I do remember reading this info on nissannews when it came out. Which is why I was baffled when I read the cam profile in the new ESM. Hopefully a revised ESM comes out in a few months.

thawk408

iTrader: (16)

So do you think this engine will be stronger or better for F/I use???

SR20DEN

iTrader: (2)

If they really did what they claimed in the press release I would say yes.

kzshin

Zluver is absolutely right.

cupcar

iTrader: (1)

Another way to look at it is torque is only a force, horsepower is capacity to do work/time which is force X distance traveled/time.

Horsepower with the right gearing usually wins- except sometimes when the time to shift gears is added in....

King Tut

iTrader: (1)

I think will all agree that the new 300 engine is much better than the 287 engine in the 6000 - 7000 RPM range. The thing you guys are forgeting is that that 6000 - 7000 RPM area is rarely ever used except at the drag strip. I think that if you look at the area under the curve of the torque on the 287 and 300 engines between 1000 and 5500 that the 287 will have more. That is what I would call useable fun to drive torque.

cupcar

iTrader: (1)

True- It just depends on your driving style- one either likes to downshift and stand on it or just stand on it.

Kolia

iTrader: (2)

Not in the real world. No.

Low-end torque is pretty useless unless you want to pull heavy load. Certainly not in a sport car !

When do you get to use 100% torque at 3000 rpm ? You would need to be WOT going up a steep enough hill pulling a trailler so that the car can not accelerate any more. Then you use all your torque.

So what if you get more torque using 60% throttle. I'll just give 62% throttle and keep up. I'll still have enough torque to smoke the tires, and if I really want to go faster, I won't be below 5000 rpm for long.

Low end torque is good for drivability at low speed. Both engine have plenty usable torque and low rpm. There won't be much difference there.

287HP

The only thing an engine "actually" produces is torque (moment of inertia*angular acceleration). The more torque your car produces in the upper rpms, the more horsepower the car has.

IceY2K1Max

iTrader: (1)

I talked to Nissan parts guru Dave Burnette a week or so ago and he said he had the latest parts diagrams SR20DEN.

Basically, he said ANYTHING that rotates/moves in the engine was a different part number on the '05s.

I think they changed A LOT more then most think.

IceY2K1Max

iTrader: (1)

He just emailed me and said,

cupcar

iTrader: (1)

I wonder if any of the parts are from this list of jewels:
Nismo engine kit

If you use Google, right click on the page and select "Translate to English"

Makes me very interested, The only thing I've missed from my stolen Integra Type R is an engine that revs!!

King Tut

iTrader: (1)

Damn sorry to hear bout the stolen ITR. I miss my Skunk2 camed LS/VTEC all motor EG hatch as well. I still hit the rev limiter sometimes cause I think I have more revs left than I do.

thawk408

iTrader: (16)

So, is this the Nismo S1 engine?

cupcar

iTrader: (1)

Here is description of the S1 engine kit, use your Google right click to translate to English

Nismo S1 engine kit

Note that it just consists of different cam timing units, cams, air filter, ECU, stronger, rod bolts and change intake system and carbon engine cover with different spark plugs shown in the picture. Listed in the text are changes to the exhaust catalysts on back plus different valve springs.

Sounds like the Track engine is a lot more than the S1 kit.

J Ritt

iTrader: (4)

I'm anxious to see a dyno on one of these cars. I'm really curious what exactly they did with the ECM.

Former ITR owner here by the way...I had a Championship White '98 #765. Theives tried to steal it once when I owned, and at least twice from the guy I sold it to...bastards.

I do miss those revs sometimes!

350Zenophile

iTrader: (20)

Why up the mass on the crank pulley? Maybe to smooth out the extra revs?