Hajes Racing is retiring

It has been years of fun, but there are currently no open projects left. Maybe one day we will share new knowledge with the World. The Hajes Racing domain is expiring, and all will be moved to archive. All should be working like before, just different domain. If […]

Brake system issues

I have spent so much time on the brake system that I can do it drunk, and in sleep. There are common issues I have faced with factory floating calipers, ABS. Surface thermal cracks on Brembo Xtra (09.9145.1X) discs PLEASE READ WARNINGS BEFORE YOU PROCEED !!! IF YOU FIND INFORMATIONS [...]

Worn MAF (Mass Air Flow) sensor

Boost doesn't matter, without air in the engine there is no combustion. There is no way to precisely measure air content inside the cylinder - that's where MAF modelling comes in. But if there is crap in, there is crap out. PLEASE READ WARNINGS BEFORE YOU PROCEED !!! IF YOU [...]

Turbo – Sticky vanes

So-called sticky vanes is a common disease of poorly driven/maintained VNT/VGT turbochargers in TDi engines. There are many causes, but most of them lead to car seat !!! Turbocharger - sticky vanes carbon deposits PLEASE READ WARNINGS BEFORE YOU PROCEED !!! IF YOU FIND INFORMATIONS USEFUL, PLEASE CONSIDER DONATION. Summary [...]

Over 5 years driving with Protlum Sport (review)

Suspension setup on Fabia HR II was lots of fun. With new kid in the garage Hilda HR I, question was "Can we do it better?" With Hilda HR I now retired - life can be understood only backwards - let's do real life review. PLEASE READ WARNINGS BEFORE YOU [...]

HR Academy

Welcome to the Hajes Racing Academy aka HRa. Here you find an index of all pages for 10 days challenge of uncovering all secrets of engine calibration that very few knows or dare to share. PLEASE READ WARNINGS BEFORE YOU PROCEED !!! IF YOU FIND INFORMATIONS USEFUL, PLEASE CONSIDER DONATION. [...]