350zQ45a

Quite possible, however it is widely believed the 3.7 is going to arrive in the G in either 08 or 09. The 3.7 is rumored to be around 350 HP, so this would not steal any business from the GTR.


I do think it would be strange for Nissan to debut the 3.7 in the current Z. I don't think they would allow the G to receive the 3.7 while the Z is still lagging with the 3.5

I think the G will receive the 3.7 either in 08 or 09 and the next gen Z to receive it as well.

I have a friend who until recently worked at the factory grounds for Nissan in AZ. He insists the 3.7 is being tested in currently, and that there is also a G hardtop convertible coming

No matter what, we are on the verge of some exciting new products. The Z & G debuted when Nissan was in the financial doldrums, these next line of cars are coming around in a time where Nissan has recovered.

The 07 G is the first indicator. Eons of difference between the old sedan and the new one.

JCZ33

Looks like the 07 HR is making near 330hp at the fly.

fahrenheit350

iTrader: (15)

Tony, thanks for the informative post.

Did you see potential for spacers or any breather mods while you were tinkering under there?

Hydrazine

iTrader: (53)

Yes.

In fact, there is much more potential than a spacer or MREV because its very adaptable to variable intake geometry, but then again, it will be much more costly to design and fabricate.

I will need to evaluate this mod carefully to see if it could be done within a resonable price range. If yes, it will make a fantastic mod for both NA and FI.

One other variable (or factor) I need to take into consideration is if Nissan will make any substantial change to the engine when the next Z comes out.

As you can see in the posts above, there is no certainty in what it will be...

shift3.5

Always been a dullard but doesn't that say at the top of the graph "flywheel HP"?? If that is the case, dyno HP of less than reported is not impressive at all. On the other hand an 04 making 250 + WHP is very impressive, and 280+WHP to the 07 is very very impressive. Just read an article in import tuner that dynoed an 06 at 232 at the wheels. Seems kind of off if an 04 is making 30 more HP over an 06. I do not recall what dyno they were using.

silverZ2006

^ It's a dynapack, it measure power at the hubs. I'm not sure about this one dyno, but Sean church's dynapack reads 8-10% higher than a dynojet.

azula

iTrader: (12)

has one been modded yet? in any way?

Armitage

iTrader: (15)

Dynopacks software always shows its at 'flywheel', but like said, its measured by bolting up the hubs. Therefore, it reads slightly higher because it does not have the rotational mass of the wheels spinning the dyno.

Hydrazine

iTrader: (53)

+1 Although it says flywheel, its really power at the wheel hub.

It is also why I included comparative plots of the other engines all from a Dynapack 4000.

shift3.5

Ok I know what you're talking about. Thats when the hook up the dynometer to the wheel without the rims or tires. Very impressive that the HR is making 280+ HP there. Its nice to know the 306 is an underrated figure. I like being conservative. Seems like when the aft4ermarket really developes within the year with a few upgrades to the exhaust (conservative 8-13HP) and intake system (conservative 5-10HP) you could push about 300WHP without a problem.

bobS

I want someone to run this car with the new engine at the track. Every review i've read on here seems like people think it "feels faster" but no one really seems to notice that much of a difference. I'm interested to see what it will do in the 1/4

Blacryan

iTrader: (3)

Metooo

hiz-n-herz

iTrader: (11)

I'd still like to see the plot of the rev-up w/ MREV2 and 5/16ths spacer against the HR. Add 13-18 lb-ft of torque from 3k RPM to 6k RPMs to the revup dyno plot and compare that to the HR

I drove an 07 HR coupe (6MT) over the weekend and I agree with another poster that the low-end 2k-3k had a lot more oomph, but the midrange and felt much the same.

True, the engine was not fully broken in but I took it up to 6k RPMs once. DId not seem a great deal faster. I'll have to wait for some actual acceleration times from a fully-broken-in engine.

Just not enough of a difference by seat-of-the-pants feel to trade in my 06 GT 6-MT. Dealer offered $25k for my 06 with 5k miles. Felt like giving them the bird! I put $5k down on my car so basically, if I trade mine in, I am losing $15k in 6 months. Ahhh... the downside of buying new and Nissan. Welcome to the land of depreciation! Granted they are offering a wholesale price.

I'll have to wait for a 3.7 or 3.8l engine before I'll trade up.

I have MREV2 and 5/16ths spacer on my 06. What can I do to get 15 HP at the top end? May as well pump money into my 06

dbasal

I agree on waiting for the next version of the Z (370 or 380, whichever they choose). The 3.5 is at the end of the road. They just can not squeeze anything else out of it.

sq40

iTrader: (4)

Very impressive.. I don't think anyone saw the HR Coming only 1 year after the REVVUP... So a 3.7 is not out of the question.

tranceformer95

iTrader: (20)

I bought my '05 Z in November 2005... If i had known i would have bought a beater to get by for a year. Hindsight is 20/20. DAMNIT.

downforce

About break-in. I know this has been talked about elsewhere but I thought since it came up... What are your opinions regarding effective break-in procedures? Here is a site that is very informative yet controversial about proper break-in of new motors. http://www.mototuneusa.com/break_in_secrets.htm

hiz-n-herz

iTrader: (11)

Yeah, I have heard these opinions and I am not sure which is better.

As an aside, Both My z and my wife's z felt noticeably faster as we passed the 3k mile mark.. I think it takes time for all the moving drivetrain parts to break in...

We'll never know...

Zquicksilver

iTrader: (5)

Hydrazine, this is not directed towards you, but the numbers you posted!?

I can't wait for the manual!

I have to give Nissan the "thumbs-up" for an avg. (94%) efficiency rating on their 07-AT drivetrain! BMW, Mercedes and every other auto maker should request that Nissan share their secret info, to aid in oil-conservation and WORLD PEACE!

SAE-306 to 284whp = 92.8%
SAE-268 to 254wtq = 94.7%

Somethings NOT right...

I made the following on a Dynopack at GRD in Naperville with Tuan sitting in my front seat. (249whp and 245wtq) My (04_Z_MT) had the following bolt-ons at the time of the test, CAI, AAM spcr, Hdrs, HFCs. Maybe he had a more conservative calculation calibrated into the software...? He did mention that my torque spike between 3500-5000 was interesting and possible result of the spacer and headers.

287 to 249whp = 86.7%
274 to 245wtq = 89.0%


Zquicksilver

spacemn_spiff

iTrader: (3)

And I should buy into that the guy knows better about any engine than their manufacturer. May be the manufacturers can hire him to rewrite their manuals. I think he should apply.