Haven't posted much on this forum and have done so much custom work to my EVO X RS, thought I would share with you all some progress and at the same time - if anyone has any ideas on what else I can do to reduce weight, make it handle better or go faster - please share.

Car is now in final stages after 6 years of track and development, most things are now custom. I essentially have a 2840lb track EVO X, I have been working on areo but I can't seem to get the car any lower than it is now. (any more and the springs are loose when the car is on a hoist), it has AST 3 way adjustable suspension with 16kg springs F&R.

It's running a 8374 EFR turbo but realized we are hitting flow issues with the exhaust (3" downpipe and straight through 3.5" high flow race exhaust), in the process of fixing my exhaust choke I upgraded to the 8474 EFR (tuning next couple weeks).

One of the best upgrades I have done to date is the sequential 6 speed XSHIFT gearbox - it's nothing short of AMAZING! Just got clutchless flat shifts working and auto blip on downshift too.

Car suffers from mid corner understeer once I get back on the gas, I have since fitted 11" A050 semi slicks over the 9" A050 tyres and increased front downforce - fixed it a great deal but still can be better.

I don't think there is much I can upgrade almost everything has been done including front and rear cusco 1.5way LSD, carbon propshaft, chromoly subframes, direct port meth injection, 2.2ltr stroked Manley built block Eagle sleeves, port polish, over sized valves, GSC S2 cams, motec M150 ecu, dry carbon doors with lexan replacing glass etc..

Car made 590awhp on a heartbreaker mainline dyno (stock it got 226whp), that was with the choked 8374, now am going back at it with 8474, increasing intake to 4" with blitz metal filter, 4" plazmaman 1400 hp hand made intercooler, R35 GTR coil packs (upgrading from 11year old stock coils), Exhaust cut out.. Shooting for 650-680whp which is about 900bhp. I'm limited to only 93 octane and run direct port methanol injection (allows me to run up to 26degrees ignition timing up top)

It's still registered (sort of) and I drive it to the track (I am building it only for Sepang F1 circuit in Malaysia, it's a good 3-4hour drive from Singapore in the loudest bumpiest most uncomfortable car...but I love it.

Let the pics do the talking..












Ohh and my daily driver is complete (570hp stage 1+ RS3 Daytona Grey):


Rob

 

Super cool thanks for sharing!

 

Having a car in singapore is baller.................having both those cars built the way they are in singapore is super baller

 

if the understeer you're experiencing is only under high speed corners you can really only fix it with more front end aero. You definitely have lots of room for improvement in regards to front end aero.

 

Car looks awesome!

Great build so far. Let us know what the numbers end up being.

 

That is one amazing Evo! Now I have a new desktop wallpaper. Sorry I can’t be of any help with your question.

How did the handling change when you got rid of the active yaw control?

More pictures please!

 

Thanks for your replies,

YES - agree, I continue to work on the front, I have huge amounts of grip in rear. I doubled the length of my chassis mounted front splitter and increased the canards with support, made a difference - I also increased front spring rate to 16kg too.

Have a few more ideas but it's getting hard as I still need to drive the car on roads.. If it was an offroad car, it would be a lot easier.

TurboTJ, being an RS model it only comes with ACD, most guys I know turn off AYC at track as it slows them down too..
If you want high res pics send me a PM lol

Rob

 

Hey man, any updates on 8474?

 

double dang

 

A lot has changed and progressed since my last post

the 8474 didn't work for me so I sold it and upgraded to a bigger turbo. I would put it down to the fact I maxed out the IWG hot side more than anything. We didn't see much improvement within what I feel is safe for a track setup. Pushed it to 2.4bar but only gained about 10-20whp and at that point we lost too much low end spool.

After that I fitted a 6 speed sequential dog box with custom gearing for my track, it gained spool when comparing to my old setup so it's no longer an apples to apples comparison when I talk about my new turbo...

So I am now on a 9174 EFR twin scroll with twin external wastegates and a 1.45 A/R hotside. It's F$%king huge haha and you would never have guessed this - the thing spools like crazy combined with my sequential, you don't even feel much lag on the street (don't forget my evo is a little lighter). Also run 4" downpipe and 4" side cutout. The meth injection had to get upgraded too (6 jets and bigger jets too - I use a LOT of meth)

I essentially have good usable power from 4,000rpm all the way to peak power and rev cut @ 8,800rpm. I'm easing into my new setup and having lots of fun, only running low boost for now but the car is very very quick.

I have also made further changes to lowering the car A LOT, I now have to run tall tyres to drive it on street and swap rims at track. increased spring rates to 20kg and redesigned front splitter which make an even bigger difference to front end grip (it's been a long and painful process of getting it perfect).

Car gained a bit of weight from some of the mods I have done, still trying to reduce it.

 

 

Thanks for the update!
Your build looks gorgeous, maybe I should consider sequential as well but it will promote me to a crazy class.
Building my X, currently at Manley 2.2, full Radium with Dual Pumper Surge Tank and 1700cc ids, planning both E85 and race fuel, no AC, no music, no sound denting, no heater, carbon driveshaft...
And trying to figure out what turbo should I get, from you experience and tracks that we got near by it seems that 8374 would be a good fit for a larger tracks, and 7163 would be great for AutoX like events.
Maybe I should get them both and swap between events.

Anything beyond 8374 would be an overkill definitely, and also it is hard now to find turbo kits for an Evo since Full-Race, MAP stopped the production and ETS and custom shops are the only options atm.

Maybe you had any more thoughts or can recommend anything from your experience regarding turbo choices?

 

Nice,

With bigger turbos like 8374 you will lose 4th gear highly likely (they can't take that much torque when running on high octane).

What type of track are you looking to get on mostly? what top speed and size?

8373 is T4 no? 7163 is vband (well it was for me). Can't just swap them out I think.

Either way, I highly recommend an 8374 and an EWG setup running 1.0X A/R hot side. lag isn't that bad and will peak power well above 8k rpm.

Rob

 

Most tracks that we have are small ones, less than a minute in total time with speeds up to 130kmh/ and slow 40km/h corners and one bigger track that is 1.2X minutes, with more medium speed corners and up to 200km/h.
I guess that 7163 Vband might suite well, at least for the first time, with latter upgrade to twin-scroll 8374 when faster tracks in countries near by will be available.

 

perfect, 7163 vband single scroll and which cams were you thinking? I ran MX1 with this turbo and peak power was very high.