Gerald's 502bhp wrx with td06-25G turbo

Gerald's 502bhp wrx with td06-25G turbo

Gerald owns one of the nicest wrx in singapore. Custom wide body kit, matt black, cool interiors, nice ICE, great sound proofing and loads of meters to like up your x'mas tree.

Well, Gerald was previously running on a big arse turbo which gave him 580 bhp on engine. BUt, it seems that too much of those high rpm power and lack of low end power made him itch for the low end 'G' feeling. Not often do you get the chance to wack top speeds in singapore la... So, 90% of the time, he has to make do with the sluggish low rpm power.

He now decided to lup in a TD06-25G turbo. Not a small turbo I know, but, not too big also. This turbo spools up around 4500 rpm on gear 1 with 1.9 bars of boost and packs a massive 70KG of torque! This ensures the passenger's head slams the head rest each time he wants their attention. Gerald's a nice guy la,... he only slams your head once or twice then turns to you to ask if you're ok... hahaha...

This ride goes onto the Dyno to trim those cock hairs on the dyno curves. Our target? 500 bhp on this turbo.

After wacking Alex's Dyno, we managed an easy 480 bhp on crank at 1.9 Bar of boost. After pushing the car a little, we managed to hit a comfortable 495 bhp. Sam turns to me and asked me to push it a little more...coz, its just a little cock hair away from 500... kekeke... I said ok, But, just to cross the 500 line and thats it. I wanted to retain the forged pistons and conrods on this 2.5L engine.

Crossing the 500 bhp marker, we clocked a good and safe 502bhp WRX for gerald. Spool up is smooth and massive at 4500 rpm. On Gear 3, the wrx engine roars even fiercer and manage to spool 1.9 Bar of boost at 3500 rpm. Satisfied, we deceided to test the powervalve effect.

With the exhaust powervalve off, we clocked 400bhp at 7500 rpm, compared to turning on the powervalve, we clocked 502 bhp at 7500 rpm. This means that if Gerald drags his bat mobile at 40 tiang, at 7500 rpm, his ride will have a difference of 100 bhp at 7500 rpm. It equates to the car pulling harder and stronger as the RPM increases. Cool.

We compare this with another wrx with stock 3 inch exhaust system. This other wrx is running on TD05-18G turbo and boost 1.9 bars of boost, and on gear 4, the exhaust is clearly restricting the engine from producing any noticeable power after 1.6 bars of boost. The owner have been advised to rebuild his exhaust system or, to keep it at lower boost settings. Its meaningless to churn out 1.9 bar without much difference.

Anyway, owner is not new to car modifications la.... he already done so much, he also have a couple of exhuast in his storeroom... he used to run on twin scroll and stuff and now using a fully forged engine with titanium valves, titanium spring and retainers. More of a storker engine than anything. He was in the car when we were pulling the redlines and it was plain clear to all of us that the exhaust is not doing its part to give a good show... Anyway, the tuning is compensated for the rebuild of the exhaust and all he needs to do is come down and have a quick check on the mappings.

In our bat mobile story, powervalve, 1.9 bars of boost, 502 bhp on crank, brembo brakes, wide body kit, 3" full exhaust system, forged pistons, forged conrods, big ass front mount intercooler and an ECU reflash is giving a good show and Gerald? Smiling and having a great time enjoying the "G" forces from this fantastic turbo.

Idling wise, very very smooth. No stalling, no jerking. FC? 8.5km/L. Boost 1.9 Bars. Day-to-day driving is as per stock.

I for one enjoyed every moment tuning this ride. After sitting on the Dyno, I was like super eager to bring this bat mobile out to test drive. OMG... So damn smooth and low end response is fantastic! The car feels so lively and responsive. His triple plate carbon clutch is wet wet... hahaha... Certainly a ride worth smiling about.

I went outside and once got the chance, I floored .... at 3500 rpm... omg... the car pulls like no tomorrow. Gear 3... thats the gear that makes your eye balls pop so big, it makes you so grateful the eye balls have eye sockets that prevents the balls from popping out. I released the gas at 6500 rpm on gear 3. Didnt want to try gear 4 la... hahaha...

Whats next on this ride? I would suggest forged engine sleeves. Evil? yeah... Lets milk that big arse turbo brudder... kekeke



Lawrence's wrx with AVO 550 turbo and then TD05-18G turbo