Dyno'ed the Car

[dkrm]

I dyno'ed the car today after installing Greddy Intercooler. Norman was there to help me tune the EVC as well.

I am happy with result and attached is the graph. I am sure we can further improve it with more time on dyno. It was run on 5th gear at ambient temperature of 32C

Engine Mod so far:

COBB ECU tuner
COBB Secondary Oil Cooler
MB Downpipe
MB Resonated Y-pipe
Fujitsubo catback
MB engine oil pan
Harman Motive cool air intake
Dodson Heat exchanger
Owen Actuator
HKS EVC
GFB BOV
Greddy Intercooler
Intercooler hardpipe

Result
628 hp at engine
840 Nm at engine

Happy2 Joy2 :D :D :D

http://www.nissangtrclub.com/attachment.php?attachmentid=2707&stc=1&d=1265213559

[Norman]

Yes YES! Impressive! so Exciting! can't sleep now... still feel the car's power band and graph in my mind...when close my eyes or even open my eyes:D

you know what... now i know more powerful is more sexy.:p

So proud to tune this sexy girl beats most similar modification R35. guess this is one of the highest HP "light tune" GTR.

PS: 120kpa boost ONLY.+10% correction ;)

[Norman]

Ok, we "finish" the fine tune on Friday with datalog.

[JeremyBlackwell]

Nice! Did you do this on stock fuel injectors? If so, what boost pressure were you running at redline?

[Norman]

the boost not really stable, mid range rpm hit the 120kpa target, drops when 5k+rpm to 110kpa. that's nothing I can do, I try to increase on the high end with higher gain but still same, so reduce it to "just" natural drop. Guess that's not enough air capacity from turbines~maximum out put from stock turbo's.

that's no boost spike at all, supprisingly the Trust intercooler build up the torque faster than i though. and this car whp dyno before intercooler change is about 540whp. That means more improve than advertise.~ with my tune^^:

ps: after installed that's boost drop to 100+- only, causing by the much bigger core. so have to do a "big" map change.~less than one hour on dyno machine.

Thanks Jeremy.

[Norman]

Bro dkrm, my Guru/Sensei Jeremy say have to fine tune for your high rpm... it "properly" can do a much better result, so when you free we go to dyno tune again.:o

that's what Guru teach: 03/02/2010 18:35 <JeremyBlackwell> other boost controllers have boost spike or taper off at high RPM. not EVC6/EZ writer!

after that, we try to break 650hp on same boost? ok? :D:D:D

[Norman]

that's still using stock injectors. that's why I try to maintain below 120kpa. guess with the bigger intercooler helps the high rpm hp on the graph.

Nice! Did you do this on stock fuel injectors? If so, what boost pressure were you running at redline?

[JeremyBlackwell]

Hello Norman, you can definitely run more boost at higher RPM than 110KPA. I have never heard of that brand of wastegate actuator, so that is probably the issue. Is it adjustable? What is the base boost with boost controller OFF? If it's adjustable, you can tighten it to increase BASE BOOST PRESSURE, which will allow you to run more boost at high RPM. We have seen over 140 kPa at 6800 RPM with stock turbos! But, this is putting a lot of stress on the stock turbos since they are out of their efficiency range and blowing hot air. And, before you try to run more than 105 kPa over about ~5500 RPM, you will want 800 cc fuel injectors so the stock injectors are not running over 100% injector duty cycle! So, I highly recommend fuel injectors and custom AccessPORT tune for them, and you will realize much more power from 5500-7000 RPM :)

Here is an initial EVC log a client sent me that they had tuned wrong (boosting 20+ psi at redline with stock turbos), and we helped lower the boost down to 17psi and smooth out the curve. The GT-R that made this EVC log had stock turbos with our Stage 5 Power Package, as noted on our 'Staged Power Upgrades' page.

[Norman]

Understand Sir!

your graph shows that oem turbo can produced much higher boost..

And I forgot to "learning" with "Owen" wastegate....(quite a lot Singapore GTR using it)

And it hit 110kpa after 5500rpm...

Yes,I will reduce it before make sure he gets Your injectors and custom map.

Thank you!

[JeremyBlackwell]

You can look at AccessPORT datalog with the injector pulse width at any given RPM, and then calculate injector duty cycle using a calculator:
http://www.stealth316.com/2-calc-idc.htm

If the duty cycle is over 85%, that is too much. For safety and reduced change of misfiring and detonation due to poor fuel atomization, you want to keep duty cycle under 80%.

[dkrm]

Jeremy,

As Norman said the car was running at 120kpa (17.4psi) with high ambient temperature. Both actuator and BOV are adjustable.

It makes sense to have the larger injector now but I wonder if it will be too rich at the lower end. I have been driven in a car with 800c injector and almost same modifications too. Unfortunately I think it was running rich on the lower end thus make it sluggish lower end. I guess I need a custom map for that

[JeremyBlackwell]

Jeremy,

As Norman said the car was running at 120kpa (17.4psi) with high ambient temperature. Both actuator and BOV are adjustable.

It makes sense to have the larger injector now but I wonder if it will be too rich at the lower end. I have been driven in a car with 800c injector and almost same modifications too. Unfortunately I think it was running rich on the lower end thus make it sluggish lower end. I guess I need a custom map for that

Yes sir, you are correct. When you install the 800cc fuel injectors, you will DEFINITELY need a custom tune with the AccessPORT.

Again, please check our 'Staged Power and Chassis Upgrades' list, as it will guide you through a proven and reliable upgrade path for your GT-R:
https://www.speedforsale.com/nissangtrparts/speed-sale-speedforsale-staged-power-upgrades-p-1030.html?osCsid=112apt36rc1uuvd82k1pm39t21

Also, even though 17.4psi may have been the PEAK pressure, please be sure to view the boost graph across the entire RPM band. Norman can show you this, as he knows the EVC datalogger.

[Norman]

OK, I always willing to try my BEST for all car lovers^^

Thanks!