Rev up motor vs non rev up motor

[Dyna962007]

Ok guys, from reading this forum, It seems these are the facts.

The 2003-2004 model motors were non rev up type producing like 287HP.
The 2005 and 2006 model years uses the higher revving motor producing 300HP.
The 2007 and 2008 used a 307HP but with slightly less torque, not sure if its a Rev up motor or not.
My question is this, just exactly what is the internal differences in the motors from 03-08 that are responsible for this increase in RPM red line and overall increases in HP.
Common sense would dictate that it might be Throttle body size increase, Caming, changes in the ECU, changes to the intake etc etc.
But we should be able to identify these changes and then hopefully incorporate some of them into the old motors.
Also I was told today, there was a problem with the older motors, 03-04 in the rod bearing area. It seem there is a stretching of the rod or main bearing bolts??
Anyone have any input on any of these points? Thanks, Mike

[carlson_mn]

Not sure about incorporating anything into older models, but yes you pretty much answered your question. Different IM, cams, VVT on intake and exhaust valves vs. just intake. And of course ECU tuning to match.

[Dyna962007]

Say, on this issue of the ECU, isnt it possible though to reflash it or mod it to different instructions for timing and rev limit, etc?

Originally Posted by carlson_mn

Not sure about incorporating anything into older models, but yes you pretty much answered your question. Different IM, cams, VVT on intake and exhaust valves vs. just intake. And of course ECU tuning to match.

[carlson_mn]

yeah that's a somewhat common mod with the altima VQ community through a company named Technosquare. They advance timing and bump rev limiter to about 7100, and probably adjust AF ratio and what not depending on your mods. I haven't looked into deeply but you can ask or search about it on the altima forum and you'll find a lot of info.

[Dyna962007]

Great info guy, thank you.
I'll begin looking for that right away, mike

Originally Posted by carlson_mn

yeah that's a somewhat common mod with the altima VQ community through a company named Technosquare. They advance timing and bump rev limiter to about 7100, and probably adjust AF ratio and what not depending on your mods. I haven't looked into deeply but you can ask or search about it on the altima forum and you'll find a lot of info.

[fishbone]

Forget Technosquare. Go straight to Cobb Tuning and get yourself an Accessport.
CobbTuning.com - Home Page

[Dyna962007]

You know, come to think of it, I sent an email many days ago to this Technosquare outfit and no return answer. Great customer service.
Ok good info again and I will get right on this pal,
Say by the way, I nitce in your sig that you use Synthetic oil.
This is a subject that I have researched quite a but and had many dealings with on my motorycles and such.
Through all of my research, I have chosen Motul 300V Synthetic Motor Oil. Ever heard of it and what do you use?
Mike

Originally Posted by fishbone

Forget Technosquare. Go straight to Cobb Tuning and get yourself an Accessport.
CobbTuning.com - Home Page

[m_turner_02]

Originally Posted by Dyna962007

Say by the way, I nitce in your sig that you use Synthetic oil.
This is a subject that I have researched quite a but and had many dealings with on my motorycles and such.
Through all of my research, I have chosen Motul 300V Synthetic Motor Oil. Ever heard of it and what do you use?
Mike

lol, did you happen to notice that he also has a trunk mounted intercooler? did that raise a red flag?

VQ Oil Analysis and Info - MY350Z.COM Forums

2007 VQ35HR Engine Oil Analysis - MY350Z.COM Forums

and here is plenty of discussion on oil choices for you. btw, I am guessing you have the de? if so I would look at penzoil platinum, it shows really good wear results in the de

and here is a very good comparison chart for the oils from the same thread:

MY350Z.COM Forums - View Single Post - VQ Oil Analysis and Info

[fishbone]

Cobb's AP is second to none when it comes to the Z. You get much more than just a tune, you also get the hand-held device which does a laundry-list of things, including datalogging to see how the tune is running. Also, you can always get an e-tune ($150 iirc) which would match and exceed what Technosquare has to offer.

[rich2342]

Originally Posted by Dyna962007

Ok guys, from reading this forum, It seems these are the facts.

The 2003-2004 model motors were non rev up type producing like 287HP.
The 2005 and 2006 model years uses the higher revving motor producing 300HP.
The 2007 and 2008 used a 307HP but with slightly less torque, not sure if its a Rev up motor or not.
My question is this, just exactly what is the internal differences in the motors from 03-08 that are responsible for this increase in RPM red line and overall increases in HP.
Common sense would dictate that it might be Throttle body size increase, Caming, changes in the ECU, changes to the intake etc etc.
But we should be able to identify these changes and then hopefully incorporate some of them into the old motors.
Also I was told today, there was a problem with the older motors, 03-04 in the rod bearing area. It seem there is a stretching of the rod or main bearing bolts??
Anyone have any input on any of these points? Thanks, Mike

Also I beleive the blocks are slightly different

[Dyna962007]

Yea I have an email into them now to discuss this, Im a little confused between this access port thing and the access tuner beta. I'm unclear on what Im looking at chief, mike

Originally Posted by fishbone

Cobb's AP is second to none when it comes to the Z. You get much more than just a tune, you also get the hand-held device which does a laundry-list of things, including datalogging to see how the tune is running. Also, you can always get an e-tune ($150 iirc) which would match and exceed what Technosquare has to offer.

[fishbone]

Access Tuner race is the software they are including for free with their Cobb Accessport. It's basically tuning software that would run you an impressive chunk of change otherwise.
You can tune your own maps and then load them up in the Accessport to have them handy when you want to load them up into your ECU if you ever want to change maps. As long as you have an OBD to USB cable, you can tune right off your laptop.

[Dyna962007]

hey thanks, that helps to understand it all.
So let me ask you this, do you feel realisticly, for the average guy who likes to go fast but does not usually race the car, do you feel this is a cost effective and solid investment?
In my case as an example, all I plan to do to this 2003 350Z is the cold air intake and aftermarket exhaust with test pipes, Maybe one day a plennom spacer and headers. Now I have to believe that even with these modest mods, the engine is going to be running lean, even though the stock ECU makes minor adjustments to fuel/air needs based upon the O2 sensor stream of information. Please tell me your opinions and thoughts on this and maybe I can stop bothering you LOL
Mike

Originally Posted by fishbone

Access Tuner race is the software they are including for free with their Cobb Accessport. It's basically tuning software that would run you an impressive chunk of change otherwise.
You can tune your own maps and then load them up in the Accessport to have them handy when you want to load them up into your ECU if you ever want to change maps. As long as you have an OBD to USB cable, you can tune right off your laptop.

[fishbone]

Look on this page
CobbTuning.com - '03-'06 AccessPORT
It will be up to you to decide if 7% increase in torque and horsepower is worth it. That means 20 extra whp if I am not mistaken. That means you should be at over 300 horsepower from your stock 287. Their Stage 2 hardware requirements state everything stock except for high-flow cat converters. In your case I see no issues running a headerback exhaust or gutting the stock cats. What's more important is the dyno graph and how power delivery is changed.
I can't speak for the Z because I only have an Accessport for my Legacy. You should probably check with other Z owners but in my opinion this will be one of the best investments for your car. Who knows, you may be able to pick one up used for cheap.
If Cobb Tuning is offering Access Tuner Race with their Accessport, this means that you can get someone that knows what they are doing to tune your car to your mods. The sky is the limit.

[Dyna962007]

well thanks for all that great info buddy, a wealth of knowledge and good stuff, mike

Originally Posted by fishbone

Look on this page
CobbTuning.com - '03-'06 AccessPORT
It will be up to you to decide if 7% increase in torque and horsepower is worth it. That means 20 extra whp if I am not mistaken. That means you should be at over 300 horsepower from your stock 287. Their Stage 2 hardware requirements state everything stock except for high-flow cat converters. In your case I see no issues running a headerback exhaust or gutting the stock cats. What's more important is the dyno graph and how power delivery is changed.
I can't speak for the Z because I only have an Accessport for my Legacy. You should probably check with other Z owners but in my opinion this will be one of the best investments for your car. Who knows, you may be able to pick one up used for cheap.
If Cobb Tuning is offering Access Tuner Race with their Accessport, this means that you can get someone that knows what they are doing to tune your car to your mods. The sky is the limit.