GTR Forum banner

1 - 19 of 19 Posts

·
Registered
Joined
·
2,514 Posts
Discussion Starter #1 (Edited)
Bought my MY10 R35 GTR in 2014.

In 2016, JM Imports built the car from a stage 2 into 1000 BHP daily driver.

The basic ingredients were as follows:-

Litchfield Borg Warner 7163 Turbo Kit







Short engine



Willall sump



CNC Stage 2 Heads with Ferrea big valves.









Gas flowed Greddy inlet plenum



AT Power throttle bodies



Custom intercooler piping and cold air inlets





Assembled engine



The engine Dyno***8217;d at 842 Wheel BHP at 6,700 RPM with 1.8 bar boost on pump fuel, so something around 1000 engine BHP.

I mostly use the car as a daily driver, but occasionally use it in anger at the likes of TOTB where it has run 9.72 seconds ¼ mile at 146 MPH using E50 fuel.



I have been feeling a tinkering itch and wanted to see if it was possible to extract a bit more power from the existing set-up.

Back down to JM Imports and the engine is currently out.

Here is one of the existing Litchfield 71mm compressor covers fitted to the Borg Warner turbos.



Here is the new larger compressor cover I am planning to fit to test whether there is more power available from the 7163 turbos.



First compressor cover mock up on the engine.



Compressor cover under construction at JM imports.



Excited to see what the outcome is.

Watch this space as the build continues.

.
 

·
Registered
Joined
·
2,072 Posts
Lovely car and awesome project. I think if I had an r35 I***8217;d go to JM.
 

·
Registered
Joined
·
2,072 Posts
JM Imports have lots of big power cars under their belt Nick, so once you downsize your portfolio, would be definitely something to consider.
Exactly my thoughts.

Look forward to seeing yours running :)
 

·
Premium Member
Joined
·
1,926 Posts
Lovely setup, didn't realise you were running 7163s, interested to see what else can be pushed from them :)

Are you running Syvecs or Ecutek?
 

·
Registered
Joined
·
2,514 Posts
Discussion Starter #6
Lovely setup, didn't realise you were running 7163s, interested to see what else can be pushed from them :)

Are you running Syvecs or Ecutek?
I am on Syvecs Tin.

It's quite hard to judge what is possible from different Turbo setups.

On my R34 GTR, I had several different turbo setups. Finally, I went for small turbine housings which were an option on the HKS 3037S setup I was running.

There was a suggestion that I had gone too far, yet the car was easy to drive and would pull 156MPH on the 1/4 at TOTB.

The above is a bit of a trial the other way going for a bigger more open compressor housing.

I am pretty confident it will lift the power, but less certain how it will affect the spool.


.
 

·
Registered
Joined
·
375 Posts
This setup looks unreal I can't wait to see this at TOTB on 27th July

have to let me know what them turbos are like. Bet they spool fast
 

·
Registered
Joined
·
2,072 Posts
These turbos will spool great. My 1 single 9180 spins up quick lol
 

·
Registered
Joined
·
2,514 Posts
Discussion Starter #10
This setup looks unreal I can't wait to see this at TOTB on 27th July

have to let me know what them turbos are like. Bet they spool fast
Time will tell if the turbos work well with these compressor covers dtox.

I will end up with something similar to the Garrett GT3076R Turbocharger wheel sizes, which I believe is the turbo that AMS use in the Alpha 10 kit they sell.

Hopefully they will retain the good spool that the EFR turbos are known for.

Not experienced any other EFR turbos Nick, fingers crossed since there is a ton of work to modify the compressor covers and then plumb the intercooler in.

Am changing to a slightly smaller inlet plenum at the same time, so plenty to do for the JM Import team.

.
 

·
Registered
Joined
·
2,514 Posts
Discussion Starter #11
Wanted to update you with a little more progress on the modifications to the Borg Warner EFR turbos.

Some more mocking up on the Drivers side Turbo.

Great care being taken to keep the compressor outlet bends flowing smoothly and minimise direction change while allowing the gasses to expand.



First mock-up on the passenger side



Final mock-up prior to splitting the outlet pipe to aid installation.



The previous Turbo inlet pipe was limited to 2.5" at the Turbo.

The new 4” Turbo inlet piping is planned to run forward to the front of the car to improve air flow to the Turbo, which will hopefully lift power further.

.
 

·
Registered
Joined
·
2,514 Posts
Discussion Starter #14 (Edited)
Apologies,

Been mega busy recently.

Good news is the build is well on the way to completion.

I went with the HKS 12 injector option for the plenum.



There are still some bits and pieces to be done over the next couple of weeks.


Thought you might like a sneaky peek at progress on the Dyno



The car is very easy to drive, with 900 Wheel ft lbs of torque by 4200 RPM.

Maximum power so far is 1025 Wheel BHP at 6640 RPM.

Depending on who's correction factor you look at, this is between 1205 and 1240 engine BHP.

Look forward to getting the final results in the near future.

.
 

·
Registered
Joined
·
2,072 Posts
Lovely jubbily. Bloody animal :eek:
 

·
Registered
Joined
·
2,514 Posts
Discussion Starter #19
How you getting on with the car Hugh?

Was just pouring over your power graph. Can't believe how well that torque comes on.
My cams are still pretty mild Martin, 264 degree duration at standard lift.

Am wondering whether the engine would breathe a little better with some 270 or 272 degree cams with an extra mm of lift.

Currently playing around with the Lambda settings to assist in getting the fueling to track the Lambda table.

The images below are similar pulls at minimum boost in 5th gear.

The first one has allot of oscillations at the higher revs



On Syvecs, Lambdas have a number of things that you can adjust.

As best I can understand, there are three components that you can adjust as follows:-

Service interval = the time between corrections

Proportional Gain = multiplier to the correction

Integral Gain = adder to the correction

Reducing the Proportional Gain gives the following.



For now I am looking for the correct mix of the above controls that will track the Lambda table without any oscillation.

Still work in progress.

Once I have the Lambdas under control, I will move on to the main fuel and ignition maps
 
1 - 19 of 19 Posts
Top