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Nissan 370Z Forum (http://www.the370z.com/)
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-   -   FI with continous high speed driving 130MPH+ (http://www.the370z.com/forced-induction/63944-fi-continous-high-speed-driving-130mph.html)

conmam 12-05-2012 06:40 PM
Quote:
Originally Posted by RandyD (Post 2047106)
are you guys disabling the limiter?
Absolutely. The MFG limiter is set at 160 mph. You cannot eliminate it, but rather have to use Uprev and program a bigger value. I set mine at 230 mph so in actuality, there is no speed limitation in this case.

elperuano 12-05-2012 06:49 PM
Quote:
Originally Posted by conmam (Post 2047295)
Absolutely. The MFG limiter is set at 160 mph. You cannot eliminate it, but rather have to use Uprev and program a bigger value. I set mine at 230 mph so in actuality, there is no speed limitation in this case.
Not unless u build a monster n hit the speed limiter!!! If u ever hit it let us know!

conmam 12-05-2012 07:10 PM
Quote:
Originally Posted by elperuano (Post 2047080)
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..
In my opinion, since I already owned a GT3-RS MK2, I have a very high expectation of a sports cars. Believe me that I paid $154,752 OTD back in 2009 for that monster and I could drive hard all day long at 130 mph + , taking corners at 1.3+G at 8000 rpm with ease and a piece of mind. By the way, my GT3RS consumed about 1 quart of oil every 800 miles during medium to hard driving. Porsche stated that it was absolutely normal because the engine were meant consume oil ... tremendously just like that.

Now, I am sure this 370Z can achieve at least 90% of that performance if properly and professionally modified , and better yet, it will cost way less than what I paid for the GT3-RS back then. The VQ37 engine bottom end is much better than most people think. I don't believe that there is any problem with the stock bottom end to spin at 8000 rpm. However, the weak link is the VVEL camless ladder assembly. Now, that is the very reason why I do not raise the factory red line to 8000 rpm. I still leave it at the cutoff point at 7600 rpm.

Like I said, the only flaw of this whole design is the excessive heat generated from the engine... and excessive heat does kill engine and other components HARD. If you can liberate the heat as what I have done, this engine can take very good high rpm and load abuse ( up to 7500 rpm only ). The engine may not last as long as my GT3RS MK2, but it will be pretty close...

conmam 12-05-2012 07:25 PM
Quote:
Originally Posted by elperuano (Post 2047311)
Not unless u build a monster n hit the speed limiter!!! If u ever hit it let us know!
Oh man.... No way to hit 230 mph. Even if you have the monster horsepower of 1000whp, you will run out of gear unless you raise the engine rpm to 9000 +, which is not possible for the VQ37VHR configuration !!! Maybe with a Vette Z06 or ZR1 gear ratio and rear end... then you might be able to.

Slight mods like my 370Z ( estimated about 295 whp I think... ). Full tank of gas. I weight about 165 lbs. Got up to ~160 mph around 6000+ rpm on 6th gear. Car could struggle another few miles but fuel got cut out. Took a while to get to 160 mph as I expected with the kind of whp that I have.

After Uprrev speed limitation was eliminated, I tried again and result was : ~ 163 -164 mph... A little less than 165 mph for sure. I wish I had a camera mounted but I could not do so... May be next time after FI. I did not want to have another friend sitting with me taking video because driving at that speed + watching for cops was very intensive and dangerous. Also, he weights 185 lbs and I can loose a good 5mph+ top speed.

If anyone ever truly tried to top end their cars , please post the data. I love to collect high speed data from different members here in the370Z.com forum !!

conmam 12-05-2012 07:37 PM
Quote:
Originally Posted by LafitteZ (Post 2047044)
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.
Can you let me know your mods since you stated from 80 mph ( in 6th gear ) to 170 mph pretty fast. I am highly interested. Thank you

elperuano 12-05-2012 07:47 PM
Quote:
Originally Posted by conmam (Post 2047335)
In my opinion, since I already owned a GT3-RS MK2, I have a very high expectation of a sports cars. Believe me that I paid $154,752 OTD back in 2009 for that monster and I could drive hard all day long at 130 mph + , taking corners at 1.3+G at 8000 rpm with ease and a piece of mind. By the way, my GT3RS consumed about 1 quart of oil every 800 miles during medium to hard driving. Porsche stated that it was absolutely normal because the engine were meant consume oil ... tremendously just like that.

Now, I am sure this 370Z can achieve at least 90% of that performance if properly and professionally modified , and better yet, it will cost way less than what I paid for the GT3-RS back then. The VQ37 engine bottom end is much better than most people think. I don't believe that there is any problem with the stock bottom end to spin at 8000 rpm. However, the weak link is the VVEL camless ladder assembly. Now, that is the very reason why I do not raise the factory red line to 8000 rpm. I still leave it at the cutoff point at 7600 rpm.

Like I said, the only flaw of this whole design is the excessive heat generated from the engine... and excessive heat does kill engine and other components HARD. If you can liberate the heat as what I have done, this engine can take very good high rpm and load abuse ( up to 7500 rpm only ). The engine may not last as long as my GT3RS MK2, but it will be pretty close...
Uhhh huh? I simply said to start low on 6th gear 80 jus puts more load and stress on the motor. It can be done but I wouldn't do it like that. I wouldn't start a full run from 6th gear going 50 all the way to 170. It's simply too low. If I'm running wot I can switch from 5th to 6th at 100 or more.

I know the VQ motor pretty well, this isn't my first boosted VQ. I don't have personal experience with Porsche jus from what I read and a few friends so I can't comment on Porsche at all. VQ motor is nothing like Porsche.

elperuano 12-05-2012 07:51 PM
6th gear at 80 is probably around 3k rpm or more.. That's not revving high at all. What I personally would do is go wot from 4th n max out at 6th. That's how I hit 150 all the time. Shifting gears around 7k.
What Lafitte is doin is starting his run from 80 on 6th gear which is prolly little more than 3k rpm. Now to push it from top of 5th into 6th is how I would do it, but rolling start at 80 on 6th... Personally I'd use another gear. To each his own

FPenvy 12-05-2012 08:36 PM
Quote:
Originally Posted by conmam (Post 2047295)
Absolutely. The MFG limiter is set at 160 mph. You cannot eliminate it, but rather have to use Uprev and program a bigger value. I set mine at 230 mph so in actuality, there is no speed limitation in this case.
i got a uprev cable where is the option to change the value for the speed limiter?

conmam 12-05-2012 09:09 PM
Quote:
Originally Posted by elperuano (Post 2047387)
6th gear at 80 is probably around 3k rpm or more.. That's not revving high at all. What I personally would do is go wot from 4th n max out at 6th. That's how I hit 150 all the time. Shifting gears around 7k.
What Lafitte is doin is starting his run from 80 on 6th gear which is prolly little more than 3k rpm. Now to push it from top of 5th into 6th is how I would do it, but rolling start at 80 on 6th... Personally I'd use another gear. To each his own
Yeah, I think so. At 3000 rpm it is not optimum for the engine torque output. That will somehow lug the motor a bit even with Twin Turbo set up. Best to go to 5th , then 6th. If you want ultimate pick up, then from 4th to 6th ...

conmam 12-05-2012 09:30 PM
Quote:
Originally Posted by elperuano (Post 2047383)
Uhhh huh? I simply said to start low on 6th gear 80 jus puts more load and stress on the motor. It can be done but I wouldn't do it like that. I wouldn't start a full run from 6th gear going 50 all the way to 170. It's simply too low. If I'm running wot I can switch from 5th to 6th at 100 or more.

I know the VQ motor pretty well, this isn't my first boosted VQ. I don't have personal experience with Porsche jus from what I read and a few friends so I can't comment on Porsche at all. VQ motor is nothing like Porsche.
I personally have built a VQ35DE rev up engine for a friend back in 2011. Stock block with cylinder liner re-enforcement , Mahle 10.1 Forged Pistons with Ceramic coating, Custom Titanium alloy rods. Displacement still at 3.5L. Stock crank nitrited. ARP main bolts and stock head bolts and head gaskets .This engine has been subjected to daily driving plus quite a few weekend tracks. It was operated very very often at 6000+ rpm and pretty often stayed at 8200 rpm. Engine was boosted with Greddy TT at 13 psi, ended up with ~600 whp @ 7800 rpm. Engine has 19000 miles on it. Absolutely no problems at all..... so far , at least.

Now, both the 35HR and 37HR bottom ends are a bit better and more rigid than the 35DE one. I am 100% sure of that. With internal modifications just like the DE motor ( in addition with a chromemoly steel crank and head studs ), these engines are pretty darn close to my H6 3.8L GT3 motor. The only limitation on the rpm is the VQ37, due to the VVEL ladder. Other than that, no problem at all for solid 8000 rpm redline once you built them.

The only thing my Porsche GT3 H6 motor had that the HR engines do not : It has forged aluminum block and head, whereas our Nissan blocks and heads are all cast aluminum. That, can make a difference in engine rigidity, I think.

conmam 12-05-2012 09:37 PM
Quote:
Originally Posted by FPenvy (Post 2047417)
i got a uprev cable where is the option to change the value for the speed limiter?
You should call Uprev and ask Jared. It is hard for me to explain though here since I don't have my car with me. If I did, I could just run out there and open up the GUI and let u know..

FPenvy 12-05-2012 09:45 PM
Quote:
Originally Posted by conmam (Post 2047471)
You should call Uprev and ask Jared. It is hard for me to explain though here since I don't have my car with me. If I did, I could just run out there and open up the GUI and let u know..
its cool bro i appreciate it. im not fully up to speed with everything in it hence why i havent tuned anything myself yet.

pwrhsms 12-06-2012 02:02 AM
Quote:
Originally Posted by Coon-azz (Post 2047095)
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:
I'm stuck in Afghanistan at the moment but I will def post some vids of top speed after I get this done.

Mr.Squeeze 12-06-2012 02:19 AM
Quote:
Originally Posted by elperuano (Post 2047387)
6th gear at 80 is probably around 3k rpm or more.. That's not revving high at all. What I personally would do is go wot from 4th n max out at 6th. That's how I hit 150 all the time. Shifting gears around 7k.
What Lafitte is doin is starting his run from 80 on 6th gear which is prolly little more than 3k rpm. Now to push it from top of 5th into 6th is how I would do it, but rolling start at 80 on 6th... Personally I'd use another gear. To each his own

Sounds like you nee 3.3 final drive, I start in 3 gear at 80 and end up in 5 gear by 150.

SS_Firehawk 12-06-2012 02:58 AM
Quote:
Originally Posted by pwrhsms (Post 2047669)
I'm stuck in Afghanistan at the moment but I will def post some vids of top speed after I get this done.
Which RC / FOB?


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