J. Mills Tuning

J. Mills Tuning Automotive Performance & Repair. We do it all. From small repairs, to big repairs. Contact Info: (919)494-2711

You can email us at. [email protected]
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We do Engines, Transmissions, Motor Swaps, Turbo Kits, Fabrication & In House Dyno Tuning.

06/11/2026

Problems..

This EK9 TypeR Honda Civic just got a fresh engine rebuild. At the customers request we also installed oil temperature a...
06/11/2026

This EK9 TypeR Honda Civic just got a fresh engine rebuild. At the customers request we also installed oil temperature and oil pressure gauges.

06/10/2026

Feeling caught up with work.

What a feeling. It's been a hot minute!

06/10/2026

This turbo K20 had excessive crank case pressure. It was using coolant too. We now see why. Cracked sleeves...

2005 Honda s2000. It has a stock engine with BladeSport drop in camshafts. We have tuned it on Haltech and pump gas. The...
06/09/2026

2005 Honda s2000.
It has a stock engine with BladeSport drop in camshafts. We have tuned it on Haltech and pump gas.

The car gained 50 wheel horsepower and 20 wheel torque 🤓

Red graph = Tuned elsewhere. The Vtec and the radiator fans were not setup in the tune correctly. Therefore the engine had no Vtec before visiting us. It was overheating as well.

Blue graph = Tuned here. Setup properly 😁

06/09/2026

Honda s2000 dyno pull. Tuning with Haltech Elite.

B Series (LS/Vtec). It's a high compression rod & piston engine. I'm not sure what camshafts are being used. They are to...
06/09/2026

B Series (LS/Vtec).
It's a high compression rod & piston engine. I'm not sure what camshafts are being used. They are too big. If I don't set Vtec higher than 6500 rpms we end up with a huge power and torque loss in the midrange. Needless to say there is some room for improvement!

Tuned on s300 and c85.
Before and after dyno graphs posted.

Stock bottom end LS Vtec. Tuned on Haltech and pump 93.Red dyno graph = stock port cylinder head. Blue dyno graph = Perf...
06/05/2026

Stock bottom end LS Vtec.
Tuned on Haltech and pump 93.

Red dyno graph = stock port cylinder head.

Blue dyno graph = Perfect Circle Engines ported cylinder head.

Im positive that we could have broken 200 whp but this vehicle is not built or meant to be put on "kill". This is a 24 hour endurance racecar. Instead of making peak power we are looking for it to last a long time.

GSR / Flex Fuel Tuned/ Haltech.Low compression piston & rod engine. In the end the fuel system stopped us because it's m...
06/05/2026

GSR / Flex Fuel Tuned/ Haltech.
Low compression piston & rod engine.

In the end the fuel system stopped us because it's maxed out (1000cc's & a factory fuel system).

The red dyno graph is pump 93. The blue dyno graph is 54% ethanol content (what we received out of the pump 🤷).

Some local pump e85... 😬
06/05/2026

Some local pump e85... 😬

Address

22 Eric Medlin Road
Franklinton, NC
27525

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

Telephone

+19194942711

Website

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