Custom subaru Tuning and performance parts
welcome to tuned by tim cox
About Me
Hi, I’m Tim and here is a little about me.
I’ve been tuning Subarus for over 12 years owning 5 different models to date ranging from stock-ish to 750BHP , having tuned more than 1200 vehicles throughout my career. My passion for performance and precision started at a young age with racing, where I learned the importance of fine-tuning every detail for maximum efficiency and power.
My background in aviation engineering brings a level of precision and attention to detail that ensures every turbo and tune is completed for optimal performance, durability, and reliability. Whether you’re looking to enhance your Subaru’s performance for the track or the street, I’m committed to delivering the highest quality and results you can count on.
Book your ECU remap or remap with speed density & flat foot shifting:
TUNING PACKAGES
Shop Performance Parts
FOLLOW ME ON FACEBOOK
REVIEWS
Tuned by Tim cox
Custom tuning solutions for all oem ecus
custom tuning for all aftermarket ecus
Great tuner, always goes the extra mile, did awesome work on my Forester with VF48 upgrade, all round good guy!
Thanks she runs great now!
No more posts
send tim a message
- For enquiries or to book a custom engine tune, phone me on 07983 997776
- tim@tunedbytimcox.com
One of our TBTC450 models making some great power and out spooling the competition.
Thank you MB Developments for the great work. ... See MoreSee Less
2 CommentsComment on Facebook
Was this done a 2.5 or 2.0?
Well done
Sorry for the radio silence
Things have been busy.
Had several cars on the Dyno with some additional remote tunes
Harry’s white blob Sti Being the strongest with just shy of 550bhp on meth and 490 on pump 99 unfortunately running out of fuel injector and wastegate spring.
Oem Ecu full flex fuel on 25% meth 1.7 bar tapering to 1.5, pulsar gtx3076 rotate turbo
Shout out to TFS Racing for picking up the pieces and completing the project.
Bretts blue wagon Wrx has one of our TBTC420 models Stock unknown ej205 made mapping interesting,made just north of 370bhp at 1.3 bar unfortunately coil pack issues ended the Dyno session short.
Blob Sti in with a front mount and twin scroll vf37
Made a respectable 360bhp( unfortunately no pictures of car or graph)
Tim’s Foz rally car running my 420 model turbo
Tuned conservatively on e50 running oem top mount making 400bhp
Mikes blob wagon (silver) has been remote tuned featuring an ej207 conversion running our tbtc420 models in twin scroll configuration, maxing the 550cc injectors at 397bhp at 1.3 bar The addition of 1050x injectors next week and 1.6 bar will net another 30-40bhp.
8 cars over the last 2 Mondays on the Dyno with another 5 remotely mixed with our shop car the hatch Sti nearing completion with a new test turbo. #tunedbytimcox #surreyrollingroad
#subaru
#subarusti
#dynotune ... See MoreSee Less
1 CommentComment on Facebook
I take it cams on the white blob? What injectors was used?
Take advantage of Black Friday with 10% off all tunes. Last dyno session of the year with spots still available.
Surrey Rolling Road 9th of December
Please message to book. ... See MoreSee Less
0 CommentsComment on Facebook
BIG NEWS
We have recently started using Surrey Rolling Road’s Dyno for tuning.
I have the 9th of December booked on Dyno.
Please contact me for available slots they are running out fast.
Thank you to all new and existing clients for the support.
#subaru #dynotuning #subaruimpreza #tunedbytimcox ... See MoreSee Less
2 CommentsComment on Facebook
Good work Tim 👏
Well done Tim 💪
Recently I had the pleasure of working on Josh Blass's Blob STI
This is one clean example with what I feel to be the perfect mods list for a fast street/track car.
Josh and I had been speaking for a while about the ability to run flex fuel on the stock ECU, many have said its not possible, but having done this before I was happy to wire it up and get to tuning.
Using an Innovate Motorsports 4 in 1 gauge with the 0-5v output this is made very easy. I personally only run the innovate gauges and recommend them to all customers as they are consistent and just work.
This car had already been setup to run speed density via the CarBerry rom patch but had no dedicated IAT sensor after the turbo, although this is not ideal it does work. being a 1 piece long runner JDM manifold I did not want to drill a new port in the intake or Process West intercooler. With this I set to wire in the OEM intercooler auto wash temp sensor that sits bellow the throttle body thus retaining 100% OEM wiring in engine bay with de pinning at ECU.
The car already made great power but the constant hassle of getting those perfect mixtures was always a pain for josh.
Specs for the car
stock engine
GTX2971 twin entry
ID1050x
Upgraded fuel pump
Process west intercooler
Fuji Racing Cold air intake
Roger Clark Motorsport AOS
On pump fuel 99 she made 357whp 428 BHP
on 25% meth she made 395whp 475 BHP
being a stock motor lots left in the tank but we gained 500-750 rpm earlier peak torque thus making a different driving experience ... See MoreSee Less
14 CommentsComment on Facebook
Great work Timothy Cox, car feels spot on 👌
How do you find the process west Top mount at this power level
That's what I wanted to run as well on OEM ECU flex fuel sensor,I assume you have used rear lambda and we have too 4-1 Innovative ECF-1 and literally after asking everyone we went with Syvecs S6 again Innovative gauges or their 4-1 are best and they work quite well Nice power with methanol on GTX2971,it's one of yours Twin entry turbos?
Load More
TBTC 470 Model results incoming.
Thanks to MB Developments ... See MoreSee Less
0 CommentsComment on Facebook
Nick and I have been speaking a while about getting this stock ej257 safely running over 400bhp.
Supporting some of the best supporting mods and our in house TBTC420 turbo
Keeping it very conservative at 1.3 bar and very tame timing we made 410bhp and 390ftlbs. 2.5 inch mid pipe
Making peak torque at the same rpm as the OEM vf43 but with 100bhp more,this is the ultimate street turbo.
Stock air box and filter, stock sti top mount
Supporting mods
Killer B hard inlet
Tgv delete
730cc injectors
Fuel pump
Down pipe
#tunedbytimcox
#hawksti
#subarusti
#HybridTurbos
#400bhp
#oemplus ... See MoreSee Less
3 CommentsComment on Facebook
How much is the turbo?
Mine is all installed and will be tuned this week. Lets see what power i will make. Will keep you posted .
Nice work
Sam Weedon hawk wrx in for one of our TBTC420 turbos and a few other parts. Keeping it very safe as still a 5 speed gearbox.
1.4 bar made 410bhp and full boost in 3rd at 3300rpm.
Still retaining the stock air box and turbo inlet there is lots left in the tank.
#tunedbytimcox
#subaru
#wrx
#HybridTurbos
#400bhp ... See MoreSee Less
4 CommentsComment on Facebook
How do we get these turbos in durban mr tim
That’s awesome I love my one🤟🏼🤟🏼
Well done
Matt Taylor's pristine legacy got one of our hybrid VF turbos, this is not like the normal tbtc380 or 420 model but based on the smaller vf45 twin scroll. Featuring a custom 9 blade turbine wheel and larger billet compressor wheel.
I helped Matt install and then set up a base map.
Unfortunately we hit the fuel pump and injector limits at only wastegate pressure which is 1 bar but still made a comfortable 285whp 342bhp 212wkw.
Thank you Matt. I can't wait to turn it up. ... See MoreSee Less
2 CommentsComment on Facebook
Need to get mine fitted .
Good work Tim