R35 GTR Performance Upgrade Dyno Graphs

[Ryan Griffiths]

While Doing alot of R&D on the new R35Gtr for a company developing a new Standalone ecu package for the GTR i thought it would be rude not to see what performance upgrades change what on the HP and TRQ Curve of the engine.

To do the tuning i purchased the Ecutek package for the GTR to use for 80% of my GTR tuning as it is very powerful and provides lots of data on the stock parameters. With this Data and info on the canbus and tcm ecu i can then get the Standalone ecu controlling the engine 100%. This will then allows all the joys of fitting a Standalone like engine trips for drop in oil or Relative fuel pressure, Manifold temp corrections, Egt trimming, Individual cylinder knock detection, extra sensor inputs and outputs, onboard datalogging, customer interaction, nitrous control, proper launch control with retard, etc etc to be used on the high end GTR's



I popped the new GTR on the dyno at SRR and it made a healthy 497bhp



I then got to work with the ecutek software on the completely stock car and did some proper R&D by adding lots of sensors for monitoring exhaust back pressures, gas temps and mass airflow monitoring to find the perfect cam timing, ignition timing and fueling setup on the dyno to find what boost you could run maximum with stock exhaust system before the backpressures and egts got to hot.
After a whole day on the dyno i came up with this..




The next day i decided to change out the restrictive intakes on the car to a 76mm kit which provides more Maf resolution at the top end and also more airflow with the K&N Filters

After Another couple of hours on the dyno it produced the below

Purple - Stock
Green - Stock Mapped @1bar
Red - 76mm Intakes Mapped @1bar



I then popped over to whifbitz to try there new Race Y Pipe, Nice saving on the weight also.









So Still running the standard exhaust system wih just a Race y pipe and 76mm intake kit i got this late that night. Still only running 1.1bar dropping to 1bar. Keeping the boost to only 1.1bar in the midrange keeps the peak torque/cylinder pressues down to preserve stock rods. Also with the boost dropping to 1bar and richening the fueling right at the top keeps the EGTs down so it doesn't melt a cat.

Blue - Stock Mapped @1bar
Red - 76mm Intakes Mapped @1bar
Green - 76mm intakes and Race y Piece



With 611bhp calibration the stock injector duties were pretty high and i knew when i fitted the downpipes next it will be too high for my liking so decided to fit a set of ID1000 injectors to ensure the fueling is always perfect.

I made some nice plug and play clips



Stock Injectors next to ID1000's



Fitted



With the ID1000's fitted it was time to fit the Whifbitz Downpipes. This was a Royal PITA fitting these!



Then it was back to the Dyno again.

Was expecting more but the Downpipe cats flow very well for cats so must be big cells and why Nissan fitted the more restrictive cats further back in the exhaust system part of the ypipes to keep egts down and backpressure lower.



For the hassle of 6 hours worth of work though im not sure its worth 14bhp and potentially having to buy new lambda sensors as the metal hardness of the lambdas is very soft compared to the cast downpipes and the thread strips on the lambdas which cost £250+vat each!! Luckily we soaked then and heat treated them to get them out!

Goes well though! Pulls 1G in first and second gear on the onboard accel meter

You can view all the graphs and compare the Dyno plots for each upgrade below

http://2bartuning.com/dynographs/

Edited by Ryan Griffiths on Tuesday 29th November 16:39

[RobCrezz]

Very interesting. Huge bhp at relatively low boost!

[GravelBen]

Impressive power, how's the reliability at that level? The guys tarmac rallying them down here started running into all sorts of problems as soon as they went past standard power.

[W8PMC]

Very nice. Similar set-up to mine, although i went for a full titanium zorst but without downpipes as most are a tad too loud for most UK tracks. Also opted for the SVM bumper intakes to up the air ante. Have not rr'd with intakes & injectors & custom map for these upgrades, but was making just shy of 600bhp with just re-map & zorst.

Makes such a difference over stock