STealthwerx Performance

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STealthwerx Performance STealthwerx was born out of a lifelong passion for cars and performance. What makes us different? Our relentless pursuit of perfection.

NORWICH, NORFOLK
TRS Performance Dealer
Custom ECU+TCU Calibrations
Servicing, Repairs and Maintainence
Diagnostics
Minor Paintwork + Detailing
Modifications - Supply + Fit We always try and achieve the best results for each car in every aspect, not just peak numbers on a dyno, but how the car feels to the individual. We are now able to offer custom TRS Performance Software, meaning we can fine tune further each car in conjunction with their calibration engineer with immediate support

Ford, VAG, Mercedes and BMW are catered for with full datalogging capability for each brand at an indepth level. With a combined 25 years of overall experience working on cars,

We are dealers for -
TRS Performance
Airtec Motorsport
Milltek
Forge Motorsport
VMaxx,
EBC
Remus
BC Racing,
Motul
ITG
GFB
SuperPro

A bit of a photo dump over the past couple of weeks - It's very much a full time job with the social media side and ofte...
10/10/2026

A bit of a photo dump over the past couple of weeks - It's very much a full time job with the social media side and often what you see on here is a fraction of what we do day to day 🚀

✅Tuning
✅Braking
✅Suspension
✅Maintenance and Repairs
✅Servicing
✅Performance parts - Supply and fit
✅Diagnostics

📍NR8 6RL Unit 15 Drayton Ind Est Drayton, Norwich

📲 07539 232320

I know people are worried about fuel prices. And I get it. You get to the pump, watch the numbers climb, and wonder why ...
09/10/2026

I know people are worried about fuel prices. And I get it. You get to the pump, watch the numbers climb, and wonder why it's costing so much more than it used to.

The reality is that global events are pushing up costs, and families here at home are feeling the impact.

But I won't accept that there's nothing I can do to help.

That's why from today, STealthwerx will be offering £50 off all cambelt bookings from November through till end of December 2026, £100 off wetbelt replacements too, and a free engine healthcheck and diagnosis session to keep your engine running tip top.

It's a small change, but if there's a practical way to help people keep more money in their pocket, STealthwerx will do it.

We may not be able to help with fuel prices, but we can help keep your car on the road running to its full potential 👍

1.6 Ecoboost Cambelt package normal RRP £525 inc vat, down to £475 inc vat

1.0 Ecoboost wetbelt package normal RRP £1099 inc vat, down to £999 inc vat

Other cambelt packages available, contact us for more details

*We always use Genuine Ford parts.

Servicing for all, not just the sporty Fords !Our servicing packages are based on what your car needs , with a more thor...
07/10/2026

Servicing for all, not just the sporty Fords !

Our servicing packages are based on what your car needs , with a more thorough and methodical approach aimed at saving you money and making sure your car is reliable, performs to its best and more economical too.

With the changing of the seasons it's even more important to make sure your car is well maintained, so regardless of make or model , get in contact for more information.

Boss man is away this week, but Dom is busy in the workshop whilst I assist remotely 👌🏻 I'll be catching up with enquire...
06/10/2026

Boss man is away this week, but Dom is busy in the workshop whilst I assist remotely 👌🏻

I'll be catching up with enquires and bookings where reception is available 👍🏻

Harry's Fiesta ST in for a Stage 1 to Stage 3 S280A package!I won't lie, this was easy, because from day 1 we have looke...
01/10/2026

Harry's Fiesta ST in for a Stage 1 to Stage 3 S280A package!

I won't lie, this was easy, because from day 1 we have looked after the car and knew everything was right.

We had already supplied an Airtec Stage 3 intercooler last year in preparation for more power, a full ITG induction kit and Milltek cat back, but otherwise it was fairly basic.

Hardware upgrades consisted of a Scorpion sports cat, larger Bosch injectors, Turbosmart dual port valve, new boost control solenoid and of course the Turbo Technics S280A, speced with our unique choice of actuator spring.

Additional work was to replace the rocker cover gasket at the same time as the injectors, a full service inc spark plugs and engine healthcheck, Airtec quick shift and worn track rod end.

Software wise, you know the score, TRS Performance updated to Stage 3, set to suit the actuator and boost limit of 2700mb.

After some adaption and datalog, perfect, out the box, tight boost control, clean lines everywhere from lambda to fuel rail pressure, a nice healthy low pressure pump output so some room left for a little more if desired, but needed?

Nah, the steady boost of around 1.65 bar average over 4000rpm feels immense on these, and proven reliable with this exactly same level of tune used and hammered in our track car, its capable of up to 340bhp , more than enough in a little Fiesta !

Interested in one of our Stage 3 packages? We have options for all, drop us a message here or on whatsapp to discuss your requirements.

My name is Gareth and I fix cars. And sometimes, stuff happens, like a misjudgement in traffic, and thats what happened ...
27/09/2026

My name is Gareth and I fix cars.

And sometimes, stuff happens, like a misjudgement in traffic, and thats what happened to Shannon's Fiesta ST recently.

A lucky escape however, as the crash bar did its job and there was no deformation of the chassis legs, it did make a bit of a mess behind the bumper and required a number of replacement parts and some close attention to detail to make it look like it never happened.

After a strip down and assessment, we replaced the crash bar, radiator surround, radiator, condenser, upper bumper panel, rad pack shrouds, replacement front bumper, front grille, lower grille, both headlights, a new genuine Ford bonnet, and Airtec Stage 3 intercooler .

There was movement on the NS wing which had to be addressed before aligning the new bonnet.

The new bonnet was prepared and primed with Novol 385-00 epoxy primer before the seams were sealed, and then painted inside and out using Mipa basecoat and Novol 560 clear.

Spray out cards were used to determine the correct shade and number of coats required to achieve the right opacity and match as closely as we could without blending adjacent panels.

After reassembly and final gap tweaking, some quality control on the bonnet to refine the finish and remove any defects found.

The eagle eyed will note I didn't completely cover the primer inside the bonnet- Neither did Ford, so we replicated that.

Any bolts disturbed were also touched in afterwards.

As a little treat, her partner Stephen treated her to the BC coilovers she had been after for a while, alignment done post fitment and finally, a replacement sunstrip.

Getting this car back to a high standard was no issue, paintwork and repairs has always been a part of what I do, and if I'm going to do it, I'm doing it properly.

She was over the moon when she collected yesterday, its heart breaking having a mishap in your pride and joy and fortunately we were able to help here, keeping the cost sensible and replacing parts with new where we needed, and some good quality used in the mix, which is good for the environment, right?

Shannon and Stephen are both lovely people to do work for as you know its always appreciated, thank you again to both of you for letting us look after your cars!

VW Polo GTi 6C tuning with TRS Performance!Mitchell's and his partners car was already tuned with another well known com...
26/09/2026

VW Polo GTi 6C tuning with TRS Performance!

Mitchell's and his partners car was already tuned with another well known company, but without having the TCU reconfigured at the same time, the results were compromised at best.

To make matters worse, the other company did offer an option for the TCU side, but the cost was extortionate, more than the total cost for us to do a proper Stage 1 ECU/TCU , and they really lost confidence at this point.

Having tuned his brothers Fiesta ST previously, they were happy to bring this 28k low miles example to us.

We began by carrying out visual checks and updating the firmware to the latest version, returning it back to stock at the same time.

I opted to have this set for stock ignition levels despite running 99 octane fuel, in case the owners had to use 95 in the future, and with the current fuel prices, this makes more sense, we could still get very decent gains without asking for more ignition.

Those unfamiliar with these on this page - Prepare to be informed!

These use a 1.8 litre variant of the EA888 Gen3 using a Simos18 ECU and this one has the 'dry' clutch DSG DQ200 transmission, which does limit us for its torque potential, this makes it even more important the TCU calibration is configured correctly to make everything work seamlessly .

At a standard output of 192PS, they are fairly pokey really, but our software option really brings them alive.

And so it proved to be the case - this thing rips! With only 1.3 bar boost coming in progressively and minimal amounts of ignition, datalogs showing calculated figures of 250bhp, quicker shift times, and yet still smooth, exactly what the owners wanted from the car.

All this car needs is a better intercooler - We have recommended Racingline which we can supply and fit, with the current stock intercooler seeing peak temps of 55c, its definitely the weakest link.

A pleasure to drive and a really nice example, bring on the next one!

When Kevin approached us about getting his wheels refurbished in black for his mint low miles Focus ST, we had to disagr...
21/09/2026

When Kevin approached us about getting his wheels refurbished in black for his mint low miles Focus ST, we had to disagree...

Whilst we are not exactly style gurus, we do know the black wheel thing has been done to death , it can completely wash out the style and design of a wheel and these 19 inchers really are a great looking wheel when done right.

So we suggested our default anthracite, refinished using Mipa Base and Novol clearcoat.

Quality materials, methodical preparation, completed the same day , and what a big difference it's made from the original silver colour 👌🏻

Onto the passenger A-pillar.A very common rot spot on these where the seams would bleed after only a few years old Part ...
20/09/2026

Onto the passenger A-pillar.

A very common rot spot on these where the seams would bleed after only a few years old

Part of the reason is a lack of sealer between the join, with age and flex of the shell, water would creep in and off it starts...

I did an initial cut but had to extend it further round.

After fabricating a repair section, a whole week was spent derusting the pillar to bare metal before Bilt Hamber etchweld was applied and the repair section welded in.

I then slightly prised open the seam to use a flexible PU sealer before tapping back into place and onto the skimming phase.

The key here is making it look original but preventing the rust from happening again 👍🏻

Mark's Fiesta ST was an interesting for us for a number of reasons!Travelling all the way from Bristol, the cambelt repl...
19/09/2026

Mark's Fiesta ST was an interesting for us for a number of reasons!

Travelling all the way from Bristol, the cambelt replacement was on the list, as was a service and investigate some strange drivability quirks its been suffering with for a long time.

The easy stuff to begin with.

First thing I did was drive the car and obtain a datalog, one wide open throttle and another on part throttle where the issue was actually happening.

It felt like it was spooling far too quickly on very light throttle inputs between 2-3k, then holding back, before surging forward again.

No throttle closure, no overboost, but the log showed a big lump of timing ITRO 12 degrees was being pulled when this occurred, so we knew it wasn't a boost related issue.

We carried out the cambelt replacement and found the cam timing from factory had shifted a fair amount - this will definitely not have helped with the overall performance!

This car was tuned by two very well known names in the industry in the past, and what I didn't want to do was put on TRS software and send it out - This was a process of elimination to prove what I already knew.

After the cambelt was replaced and timing corrected, it was back out for another road test - sadly, the strange on/off feeling was still there, so it wasn't the cam timing.

Another issue was the commanded lambda was consistently asking for more fuel in closed loop at low RPM than it should have and this showed in open loop too with a massive STFT swing to positive coming onto boost, this affected the overall LTFT bias towards a deep negative.

We knew this car had a uprated CP actuator from a previous tune, so we had to look into this further, it was then we found an excessive amount of preload, around 9mm, and snagging of the wastegate arm across its travel.

Sorting this out with a good stock actuator would then rule out the old actuator as a potential cause.

You guessed it, it didn't. And as expected, much lower boost across the board as the previous tuner had pulled requested duty out to suit the overly strong set up from before.

To get this car performing right, using our proven option of TRS Performance was the only way forward.

One file was all it took.

Setting the ignition where we wanted it to suit the fuel and hardware and stock actuator tables, we saw improved spool at a lower RPM without any of the surging or flat spot issues it had before.

We could set the peak boost lower (the previous tuner had a 2700mbar limit before!) , not push the turbo as hard at the upper end of the rev range and still see a 7g/s MAF increase, the icing on the cake was a much stronger mid range too without the drop off, and a commanded lambda that now did its job, tight control of the trims, no more adding fuel where it wasn't needed.

All we wanted from this car was for it to drive right. We didn't want him to switch his software for the 3rd time, but 3rd time lucky was the route we had to take.

He can now enjoy the car as he should have done in the past.

A very satisfying job undoing all the mistakes I must say, and we really appreciate Mark making the 4.5 hour journey to us, sometimes, you do have to travel..

Address

Unit 15 Drayton Industrial Park, Taverham Road
Norwich
NR86RL

Opening Hours

Monday 8:30am - 5pm
Tuesday 8:30am - 5pm
Wednesday 8:30am - 5pm
Thursday 8:30am - 5pm
Friday 8:30am - 5pm

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