I'll probably do a bit of both. I reached out to GTM today and gave them my goals. I'll see what they come back with and then I'll have to set a budget mark and go from there.

I dont really see the big deal with sustaining high speed. It would be one thing if you were under high load the entire time... but once I am finished accelerating, it isnt requiring enough power to sustain these speeds that it even stays in boost. I still have a 100% stock cooling system even the radiator, etc. I have over 18,000 miles with the turbos and while I dont go that fast every day, I do it often enough. I also used to ride the speed limiter pretty often when the engine was mostly stock with stock speed limiter. I really use the power the car has all the time... I wouldnt say I beat on it, but many would look at it that way.

I think that if your tune is good enough, youre fine.

5th is not "overdriving our engine" (1:1) As long as your motor can pull through the gear, it's not any different on the engine than doing 30 in 1st gear. 5th and 6th just aren't as robust as the other gears.

I drive 100+ a lot. Stage 2 TT kit and I haven't had any issues... Love to see how fast my mph climbs at wot

I have a vented hood, csf radiator and 34 row oil cooler from z1. I no longer see over 220 no matter how hard I drive it. Stage 2 gtm twin turbo. Iv been 180 in my 370 and it had more in it. I dont have the balls on the street to go faster.

Nice! I stopped at 150 on my G. Has more but I'm stock block n don't wanna push it that hard.. If I had built motor tho I'd peg the needle til it couldn't move anymore!

Lol my kind of driver I have hit 170 in my Z a few times no room or need to go any faster.

Good to have a real auto enthusiast here. It’s hard to find high speed freaks like me around here. Glad I found you. I will share with you ways to overcome your cooling issue. First, Here are the very important links to some of my work. I will post the part with cooling fan temp PCM modification soon :

http://www.the370z.com/diy-section-d...-part-1-a.html
http://www.the370z.com/diy-section-d...t-2-final.html

I am a high speed driver as well. My favorite part when it comes to highly spirited driving is doing super high speed. 130 mph is nothing if the 370Z is properly and professionally modified (Of course it is not that cheap ). I used to own a 2009 GT3-RS and 130 mph was like lunch everyday. Loved that car every minute of it, until my damn brother severely wrecked the car 2 years ago.... Yikes......... Anyway, this is the ultimate and reliable way to cool down your engine considerably.

The fact is this VVEL cylinder heads act like a heat pump. Very nice design but thermally very inefficient .They generate a tremendous amount of heat that you would not believe. These below are the true weaknesses of the VQ37VHR oil and water cooling system , and that's why the engine temp itself runs very hot, and thus the super hot oil temp :

1)) Factory radiator is flimsy and very thin. The whole cooling capacity is only 9-1/8 quarts. After the engine fully warms up for 30 minutes and especially at 85F+ ambient temps with highly spirited driving, this radiator could never cool the engine down below 217F.
2)) No factory oil cooler
3)) Engine Oil capacity is very little. Only 5-1/8 quart
Well, I think Nissan engineers know well this design will allow the engine oil overheat to 285F in no time under high speed / load / rpm driving . But this is the best that they could do in order to keep down the cost of the car.
So, :
1)) You need to have the Mocal thermostatic oil adapter and a 25 row oil cooler ( Setrab is the best ) installed.
2)) You need to modify to this dual row large radiator as shown in the 2 links above
3)) Using Uprev – tuner version and reprogram the fan duty cycle so that the fan will turn on at lower temperatures. This is VERY important since factory setting will NOT allow you to fully utilize this large radiator capability. Please see these links for stock fan setting and modified fan setting, respectively :
http://i1061.photobucket.com/albums/...ckradiator.png
http://i1061.photobucket.com/albums/...fansetting.png


4)) Install a Greddy oil pan ( My future project soon… )

Notice : Step 3 is VERY vital. If you retain the factory fan setting, you will not be able to utilize this radiator to its fullest capability. This is where it gets the coolant temp down to about 195F , and thus considerably cools the oil down way further. A must for twin turbo 500whp package
Step 4 is also very important. Not only this Greddy oil pan adds another 2 quarts of oil, which further cools down your oil temp, there are baffle plates that will help to minimize or eliminate the oil starvation. Believe me on this when you start rpm the car at about 7000+ while pulling a 1.3 to 1.4G turns .... and this VQ37VHR does NOT come with a secondary scavenging oil pump.

After everything that I have done above ( Except with the Greddy oil pan ). I did drive at a 5 mile real hard driving on HWY 9 ( Rpm from 5500 to 7600 rpm constant ) at about 88F – 90F ambient, my oil temp NEVER got passed 215F. In comparison with just the 25 row oil cooler alone before, I was up to about 250F all the time. And with no oil cooler, it went up to a dangerous level of 280F+, almost put my car in limb mode…..

Remember : Heat kills your engine. How do you think the Carrera 4, GT3, Carrerra Turbo can survive that heat in super high speed and high RPM ? The reason would be because they have 9+ quarts of oil and a 25+ quarts cooling capacity. You can verify these specs yourself. The VQ37VHR engine is not quite as stout as Porsche and may not last as long under severe and high speed drivings, but it is plenty strong and will last for a while if you keep it cool enough .

Good luck.

:iagree::iagree:Yeah you are darn right. The water temp gauge really, really sux !!!! I mean at least an analog gauge looks much better even if it does not show the real temp. That's one thing I hate about the 370Z

my z can hit 190. with just like it is. Im pretty sure. I can leave it in 6th gear and punch it at 80 and it carries me to 160 and 170 pretty damn fast. yes these guys are completely right. with the right aftermarket stuff you shouldnt see and cooling problems at all.

Wow, 6th at 80 to 160-170. I wouldn't do it like that. Car will be under a lot of load and running hard too long..

wow. Some great intel. My Z will do 0 - Oh ****, a cop! LOL

Just because I don't have the ability to go that fast, could you do video of your next run? Just so I can enjoy it to! :tup:

are you guys disabling the limiter?