Thanks guys for the helpful info , as I said I will be going to few large rotary shops next week for
Dyno testing and they have a dyna pack .

And then 1/4 mile run for the real proof .

Will be using 275/40/17 ET SS street radial for the 1/4 mile run .
I'm hoping for a mid to low 10s

A picture of my engine bay , as you can see Im still running standard intake pipes and blow off valves , and factory fuel rails , oem secondary injectors hiflowed to 1400cc , and a 460lph intank fuel pump and its all that's required for fuel setup.

My arm is change only what needs to be for power gains .

 

Looks really clean!

If you do go to a hard pipes for the turbo inlets (2ndary turbo inlet might make a little difference) you could get them powder coated black.

 

Great info blue TII , yes I have had hard aluminium pipes years ago , but that was running lower boost levels 16psi , and found no improvement .

But now at 20psi there might be some restriction.

I know for a fact that the series 8 intake pipes material was improved to a harder rubber type .

Your Usa model fd3s series 6 had old intake had softer rubber pipes , which collapsed at high boost .

But you may be on to something , the series 8 pipe are not smooth on the inside they have waves, So at higher boost they might create turbulence and restrict the airflow.

So I need to do some vacuum testing to check it .

 

Clean setup, and I'm curious how the dyno and 1/4 mile runs go.

Also, why not t-bolt clamps on the IC piping?

 

Oem Ic hose clamps work perfect, never had problem using them .

Super u type Ic size
2x 300mmx 180 mmx 88mm
16 tube and fin tubes .

 

I used T-bolt clamps on my FC build 15 years ago and didn't have a boost leaking problem with them in that time.

But, T-bolt clamps mess up your hoses because they bunch it up near the clamping point, it is a very uneven cinching mechanism so you have to go even tighter with them which cuts into the hoses.

Unless you get the bulky T-bolt clamps with the Belleville washers under the bolt head they don't keep a constant tension on the hose either, so you have to over-tighten them when the hose is nice and hot to keep everything under tension.
Further cutting into your hoses.
------------

On my FD I used Murray clamps.

They have an inner band that moves as you cinch so the hose doesn't get bunched at the cinching mechanism and they have a spring incorporated into the outer band so they keep a constant tension on the hose that will keep the connection tight from the 1st install even under thermal cycling.

Plus they look OEM to the unobservant eye.

http://static.summitracing.com/globa...m081_pz_ml.jpg

 

Hi guys
Just update with twins , been doing some more testing , making 325 rwkw on mainline
Dyno, only reved it to 7500rpm still making power just run out of injector flow .

So will be upgrading injectors and going to try e85 soon.

I believe the Bathurst sp twins will make 350 to 360rwkw on e85 .

I'll keep use update , waiting on upgrade injector kit from full function Engineer

 

Any updates?

 

Soon ,some improvements that's taken longer than expected,
like the fuel injectors upgrading.

And Also Ive improved flow of the metal Catalytic convertor to 6inch diameter 50cell , and 3inch in length the piping still 3.5inch in diameter .

Currently in the process of tuning the whole map on e85 , so im expecting to run it up on the mainline dyno next week .

 

OMG that under-carriage is so clean!

Exhaust looks great as well.

 

Thanks , The FD has been a hobble and passion for over 15years , testing and developing upgrades that factory fit like oem to make more power yet still street legal .

My aim is only to change what is needed to improve performance .

This is the list of upgrades on my fd

Apexi pic
3.5 dump pipe
3.5 mid pipe with 6inch diameter cat 50cell
Knight sports 3.25inch rear muffler
Walbro 460lph fuel pump
Hitachi Bathurst sp twin turbo (that ive develop with hitachi engineers)
Twin past intcooler 2x 300mmx 200mm x 85mm ( 2piece vacuum carbon ducting for maximum air flow to cooler cores oem fitment.
Hks clutch kit
Hks indium spark plugs
Auto Exe carbon intake kit
Oem 850cc injectors in the primary manifold
And hi flowed 850cc to 1400cc in secondary manifold
The engine has four extra dowels and Revolution 3piece apex seals everything else on engine is oem

I will be running e85 And if I end up having enough injector flow for 20psi boost I should make around
350 rwkw

The twin operate at 20psi at 2800rpm and hold it all the way to 8500 rpm

I'll keeps use guys update , any questions I'll be glade to answer.

 

Thank you I enjoyed reading this thread .

Indeed , it looks very clean ! Your car is a great example, I think anyway.

350rwkw would be a new world record for the twins.

 

Hi are those twin turbos available to buy?

 

These may give BNR a run for their money if they show to hold up.

Love the stock mount, what intercooler is that?

 

Bnrs twin are limited in flow which limits torque and power
List of the reasons

1:they use oem compressors covers a/r
Mine are larger a/r special Hitachi production , from
Bathurst sp model.

2 Bnr uses standard actuators , which limits you to run higher boost pressure with oem valve controls , when tuning with Apexi pfc Ecu

Mine are manufactured by hitachi with higher Spring pressure.

3, bnrs also uses garret Chra which have got the wrong compressor trims and turbine wheel trim values .

And also the garrett turbine wheel that Bnr uses are too wide , which causing excessive back pressures .

My compressor wheel and turbine wheel were designed by hitachi engineers Japan,
Specific for rotary flow Characteristic .
And the Chra are the new type designed for higher boost pressures and are design for rotary high temps

Here are some update power runs with the Bathurst sp hitachi twins running e85 fuel on 22.5 psi at 8500rpm ,

Im currently in the process of upgrading the fuel regulator , as the oem reg maxes out at 58psi fuel .

340kw and 800nm torque ,

My Bathurst sp 650ps twins have still more power in the .

 

The new adjustable fuel regulator oem fitment set up to go on soon . Will fix the fuel pressure issues that ive being having from oem reg.

The oem regulator is good for 20psi boost guys.

 

Got my Mickey thompsons. ET street R 245/45/17
On my spare spirit r rims
Hopefully will be going 1/4 mile race track next Wednesday .

Will keeps use updated .

 

For those that don't know , there is a new hitachi oem replacement , (HT12-3KAI )
but there not the Bathurst sp 650hp spec , don't get confused .

They flow 15 to 20kw at the wheels more power than standard ht12 ,HT -10 .

They do have the new improved bearing cartridge for higher boost .

HT12-3KAI improvements Over standard ht12
Larger compressor billet wheel
43.2inducer x 62mm exducer

And larger waste gate hole opened up from 25.5mm to 27.5 mm .

Removes boost spike

They still use 0.45bar pressure springs on actuators but they are adjustable to help hold the boost to a max of 16psi at 7000rpm .

 

And these are hitachi Bathurst sp 650ps model

 

Keep up the good work, hope to see some good things come from this.

Would love to get some actual video when you get things finalized.

Turning this into a solid swap kit for us US guys might be a godsend to those that feel our stock FD's are lacking in power

 

How much is this intercooler and where can we buy it in the USA?

 

Slightly off topic, but I notice you have tuned several different versions of twins, and was wondering if you could compare and contrast some of them. Particularly, Bathurst vs knightsports vs bnr.

I am very interested in hearing about the differences mainly between low-end vs top-end power and "feel." My current build is using 99 spec twins because my research has shown that they have a little more punch on the low end, making them slightly more fun for the street over the bnrs. But that same research showed the knightsports to be very "perky" initially as well.

It would be great to hear your feedback on the turbos you have tuned. It would be cool to hear what you think are the most well rounded turbos of all of them. If it makes a difference, I am interested in the sequential form of the turbos.

 

h_turbo

Super u type Ic size
2x 300mmx 180 mmx 88mm
16 tube and fin tubes .

How much is this intercooler and where can we buy it in the USA?

Knight Sports.

There was a very very nice shape used on for sale a few days ago here on the forum for $1,000 complete with duct.

 

Not gonna lie, MT slicks on SR rims is a combo I never thought I'd see

https://www.rx7club.com/attachments/...0ps-image.jpeg

 

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