R35 Dyno Tested Options

[mc tuner]

We have put our GTR R35 Company car to the test. The car is a Bone Stock 2009 GTR with 500Miles on it. We ran the car on 4th gear and 5th gear and used 95RON Fuel (equivalent to 91 US) on our Dyno Jet. We disconnected the front wheels and ran the car on the Dyno as Rear wheel drive car. So all the numbers you see are RWD SAE Corrected. Also, you will find the Boost curve and the AFR Ratio on the Dyno sheet as well as power and torque. We found out the following:
1- The Engine is running extremely rich on the top end
2- The Engine is running a little lean on peak boost.
3- The engine is boosting an average of 12.5 Psi. Peaking 14 and dropping to
4- We noticed that the care knocked on peak torque at around 4000 rpm. We believe it is due to the 95RON fuel. Therefore, I believe the standard ECU is not capable of compensating for the Shitty 95RON (US 91 RON+MON/2) fuel we have here.






We are going to take delivery of our HKS GT570 kit by next week. We will install it and run the car again on the Dyno. We will use 95RON Pump Gas and VP Racing 103 and see if it will make a difference.

Regards,

Husam
MC PERFORMANCE

[MindlessOath]

nice job, good to hear. why did you choose to unhook the front wheel drive?

This post has been edited by MindlessOath: Aug 22 2008, 11:25 AM

[paul_k]

Interesting AFR and boost numbers

Do you have numbers for rear drive train efficiency?

This post has been edited by paul_k: Aug 22 2008, 11:47 AM

[mc tuner]

nice job, good to hear. why did you choose to unhook the front wheel drive?

The GTR is not a 50/50 4WD. there fore it cant run on our 4WD Dynojet. otherwise we will damage the GTR's 4WD System

Husam,

MC PERFORMANCE

[mc tuner]

Interesting AFR and boost numbers

Do you have numbers for rear drive train efficiency?

if you calculate the usual 15% power loose for the rear wheel drive Train and add it to the 427RWHP on the 5th Gear Run (1:1 Gear Ratio) you will end up with about 490 Engine Power.

Husam,

MC PERFORMANCE

This post has been edited by mc tuner: Aug 22 2008, 12:21 PM

[MindlessOath]

but the thing is... the R35 GT-R has a 10% friction loss. not 15%. nissan have stated that themselfs.

have you tried the cost down meathod? here is a bit on the topic http://yarchive.net/car/horsepower_measure.html you can google for more info.

in any case dyno specialist have to give up this whole guessing game with friction losses. its an old geezer way of thinking. but above all a dyno is just a tool, not able to find accurate data especialy not the factory spec horse power... it will be able to tell you before and after, Afr, guestimate of the powerband etc. but none of those are going to be accurate to a t.

also somone in annother thread commented this...

Edmunds have also dyno tested a GT-R and produced a great write up about why the GT-R's dyno results
should NOT be corrected. The GT-R runs an absolute pressure controlled iterative system. For every RPM, Throttle
Position, etc. the ECU has a setpoint manifold absolute pressure. The boost is continuously adjusted up or down
to achieve the setpoint manifold pressure, which is fed back to the ECU via a manifold pressure sensor or similar device.

Since the system is governed by the absolute pressure, by default it automatically corrects for air density and air temperature
up to minimum air density/maximum air temperature combination. It is entirely unlikely that anyone will drive
a GT-R in conditions that overstep those maximum/minimum values.

This also means that comparing boost pressure is a pointless excercise as the boost is contunually varied to
account for the ambient conditions. In this car the boost is just a means to an end (the required manifold pressure).

From edmunds,

SAE J1349, Section 5.5:

"... boosted engines with absolute pressure controls shall not be corrected for ambient barometric pressure."

This post has been edited by MindlessOath: Aug 22 2008, 01:47 PM

[paul_k]

if you calculate the usual 15% power loose for the rear wheel drive Train and add it to the 427RWHP on the 5th Gear Run (1:1 Gear Ratio) you will end up with about 490 Engine Power.

Apply 15% to the torque figure and you get 495lbft engine torque

[mc tuner]

but the thing is... the R35 GT-R has a 10% friction loss. not 15%. nissan have stated that themselfs.

in any case dyno specialist have to give up this whole guessing game with friction losses. its an old geezer way of thinking. but above all a dyno is just a tool, not able to find accurate data especialy not the factory spec horse power... it will be able to tell you before and after, Afr, guestimate of the powerband etc. but none of those are going to be accurate to a t.

also somone in annother thread commented this...

I totally agree. and if you paid attention to what i said. i said the usual and i meant the most common method used to calculate the engine power. i also mentioned that we are using this base run to compare it with the HKSGT570 kit run and see the difference.

Husam,
MC PERFORMANCE

[MindlessOath]

ah :D got ya.

your guys homepage isnt up yet is it? i wanted to link it on my blog but couldnt.

[mc tuner]

ah :D got ya.

your guys homepage isnt up yet is it? i wanted to link it on my blog but couldnt.

Yes, it is unfortunately still under construction. but coming soon. thanks for the effort.

Husam,

MC PERFORMANCE

[mc tuner]

This is a link to the Video of the Dyno test we have done.

Special thanks to our New MC Performance Team Member H.Tofeaq for the Video Clip

Enjoy

YouTube - MC Performance GTR R35 Skyline dyno

[werewolf]

if you calculate the usual 15% power loose for the rear wheel drive Train and add it to the 427RWHP on the 5th Gear Run (1:1 Gear Ratio) you will end up with about 490 Engine Power.

Husam,

MC PERFORMANCE

Please allow a correction ... you took 15% of the wrong number. At no point should you be calculating 15% of the RWHP.

RWP = EHP - 0.15*EHP = (1 - 0.15)*EHP = 0.85*EHP

If you are measuring 427 RWP, assuming a 15% drivetrain loss means an Engine HorsePower (EHP) of 502HP.

[mc tuner]

Please allow a correction ... you took 15% of the wrong number. At no point should you be calculating 15% of the RWHP.

RWP = EHP - 0.15*EHP = (1 - 0.15)*EHP = 0.85*EHP

If you are measuring 427 RWP, assuming a 15% drivetrain loss means an Engine HorsePower (EHP) of 502HP.

Yes you are right but, this is the usual loss number from the manual tranmistion. now Nissan are claiming 10% Drivetrain power loss on the GTR which brings the number to almost 470hp !!!

Husam,

MC Performance

[mc tuner]

By the way Guys,

We at MC-Performance where about to install the HKS GT570 kit on the GTR and Dyno test the car. after we received the kit we came across this Video Clip:

http://www.youtube.com/watch?v=GlTM7M3Am4I

If you notice the car sound is too loud not to mention Ugly. We also got the same feed back from a friend who installed the same kit on his GTR and very unhappy with the sound quality. so we decide to talk to HKS Japan and see if they can do something about that before we install this kit as the sound quality is bad. not to mention that we where planing to install the HKS Cat-back Exhaust along with the kit. We will be trying the COBB Tuning Software instead along with the HKS Hyper Drop in filters.

Husam,

MC-Performance

[GamblerZ]

http://www.youtube.com/watch?v=GlTM7M3Am4I

Corrected link

[mc tuner]

GamblerZ

Thanks, what do you guys think of the Exhaust sound after the HKS GT570 install.

Husam,

MC PERFORMANCE

[justinn]

GamblerZ

Thanks, what do you guys think of the Exhaust sound after the HKS GT570 install.

Husam,

MC PERFORMANCE

Hey Husam,

The car actually is not running lean in the midrange. The air pump on your wideband is not working, the WBO2 sensor is on it's way out, or you are reading the AFR after all of the cats. I assure you, that in the mid range, it's even richer I saw high tens, tapering to low 11s. I also extracted all of the data from the ecu during the dyno runs :D

Justin

[mc tuner]

Hey Husam,

The car actually is not running lean in the midrange. The air pump on your wideband is not working, the WBO2 sensor is on it's way out, or you are reading the AFR after all of the cats. I assure you, that in the mid range, it's even richer I saw high tens, tapering to low 11s. I also extracted all of the data from the ecu during the dyno runs :D

Justin

Justin,
Welcome Back

You are probably Right. we only suspected that due to the Audible knocking we here at the beginning of the run. My friend, the GTR is not coping with our Shitty pump Gas. i also cant help not having access to the ECU Data and i feel like hand folded. The good news is that we are going to have a Tuning Session with HKS from Japan in our shop to install the HKS F-CON V Pro in the GTR and EVO X in the beginning of October.

[mc tuner]

Hey Husam,

The car actually is not running lean in the midrange. The air pump on your wideband is not working, the WBO2 sensor is on it's way out, or you are reading the AFR after all of the cats. I assure you, that in the mid range, it's even richer I saw high tens, tapering to low 11s. I also extracted all of the data from the ecu during the dyno runs :D

Justin

Please tell us. what kind of timing this car is running in the Mid range and Top End. i hared rumors that Up Rev where involved

[mc tuner]

Hi Guys,

We have just finished installing the HKS GT570 kit on a customer Red GTR. we started the car and was fine for a while before the Check Engine light came ON. we are working on solving this problem at the moment and we will update you soon.