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Designing, developing, testing and producing top quality Series Landrover parts.

11/09/2026

Well this EFI kit gets even better.
MPG Test

Test run was 20miles round trip, we are based in North Devon and it's hill after hill here. The test route is the A39 out towards Bude and then back to Barnstaple. Weather conditions for the two runs were very similar and the only change was the EFI kit.

Running the Weber carb and optimised dizzy the 2a managed 12mpg. The engines quite worn and tired so 45mph was the target speed but we ended up doing 30mph for the uphills. This puts us a little at odds with the 60mph speed limit and other traffic but it managed it.

Next up was the EFI kit. Target speed was 55mph which it maintained going up hill and it was happy to do 60mph+ on the flat and down hill.
19mpg was achieved and with way less effort.

I will stress that this is a rolling fast hill route. So 19mpg from a series holding 55-60mph was a great achievement with said hilly route. The consumption was 58% less with the EFI kit while travelling faster.

I will also stress this is a tired worn engine, it doesn't feel like it with the EFI kit fitted but it is.

If we were to test the kit on the motorway on flatter ground even more mpg could be had. Unfortunately we won't get chance to test it as that's over an hour away just to start the test and the customer is excited to get the vehicle back.

Another great result for the USP EFI kit.

01/09/2026

Atpower throttle bodies Vs Normal throttle body.

Here you can see the two as fitted on our test vehicle.

The ATPower throttle is the thick lines on the graph and the normal throttle is the thin line.
Big difference isn't it?

This is one of the many reasons we choose a high end throttle body over the stock generic type. This design won awards for it's innovation and is a patented design that took years to perfect. Not only is low throttle transition much much cleaner, more power and more torque is given.

The graphs can't lie but they also don't tell the full story.

Every time you touch the throttle you get a better experience.

Think about how many times you will touch the throttle?

Some times in anger and sometimes gently to pull away.

Every time the ATPower throttle will give you a better experience.

CNC

25/08/2026

Well the results are in and even we are shocked at the results.

Red line, engine power.
Orange, Engine torque.
Blue line, Wheel HP.

Stock motor with Webber, fuelling correct. 35hp at the wheel. 126nm torque and 59hp at the crank.

Stock Motor USP EFI kit. 50hp at the wheel. 138nm torque and 70hp at the crank.

This is not a freshly built motor, the improvement is so dramatic.

Thats 42% increase in peak power and 10% increase in peak torque.

But this doesn't tell the whole story. Look at the graph it makes so much more everywhere. Response is instant and this is on a worn motor with at least one dodgy tappet!!!😆

This has truly changed the game.
tune

24/07/2026

Day two EFI testing on the Dyno with Winston the Mahker series 3 petrol.
Today we back to back tested the tried and tested ACR inlet manifold with our EFI kit against the USP High performance modified inlet manifold and the results were very impressive.

ACR inlet with our EFI kit managed 67hp at the wheels, 100hp at the crank and 142lbft torque.
The Torque is the same as the ACR carb but the power was up by 7hp.

The USP modified inlet manifold managed 72rwhp, 105hp at the crank and an impressive 150lbft torque. The USP inlet manifold made more peak and more right the way along the curves.

Driving on the road is crazy impressive over the ACR carb. So much smoother way more grunt right from idle. So little throttle is required to maintain a set speed. Can't wait to get the MPG figures in a couple weeks time.

I didn't think our modified inlet would out perform the ACR inlet manifold so this was a welcome surprise.

EFI does work on different principles so I'm really happy with this result as it will actually save customers money as we modified a stock inlet for this option so costs are reduced compared to buying the ACR inlet.

I would like to thank Dave Lea Mahker for lending us Winston the Series 3 petrol. Roland from ACR for his amazing performance parts(fitted to this engine) and his endless knowledge and helping us along the way. John from for helping us to put the kit together and Hybrid Tune for the two days graft on the Dyno. It's been truly epic and the Trucks so impressive to drive. Mpg figures to follow and next up will be a stock engine with stock exhaust etc.

22/07/2026

Super happy with Dyno session today. were kind enough to lend us their Series 3 88" called Winston for EFI kit testing.

Winston's engine is far from stock it has many ACR internal parts including 2.5l pistons, ACR cam, big valve head and the ACR carb.

Winston pulled 61hp at the wheels and 94hp at the crank with the tried and tested ACR carb kit.

It then pulled 67hp at the wheels and 100hp at the crank with the USP EFI kit.

Super happy with the testing, Next up is a stock motor.

21/07/2026

Collected this absolutely stunning Series 3 88" today from

Wonder what power this would make on the Dyno?

Lots of Quality ACR performance upgrades, let's see how it does!!!

02/07/2026

Starting to flirt with the next Series landrover EFI kit...... Can you tell which engine this manifold is from???

01/07/2026

Putting together the first "High Performance" EFI kit for a customer's car.

We have two Kits available, the base kit is for the Stock inlet manifold, on stock engines and the "High Performance" kit uses the ACR inlet manifold and other ACR parts.

This kit will be going on a high spec ACR engine running an SU HS6 carb.

Back to back dyno results will give a great comparison between the two systems on the same engine.

Then a few weeks later we will be testing a stock motor with the base kit.

Very exciting times indeed.

30/06/2026

Ladies and Gents, the USP spin on oil filter conversion kit is now in stock available on the website.

Www.ultimateseriesparts.co.uk

Super happy with how this turned out and it's the first available USP product.

Get in touch if you have any questions.

Address

13 Oakland Avenue
Barnstaple
EX312EL

Website

https://ultimateseriesparts.co.uk/

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