(HR) Hajes Racing

No Brain, No Pain - No Pain, No Gain

BHG – How to find optimal air-to-fuel for your TDi

This article is part of infamous Brutally Honest Guide to car hacking. Our fist air-to-fuel article has been met with great outcry from duners, chiptuners and other forms of tExperts desperately defending their truth. No matter what facts you present, people love to hear only what they believe is true [...]

BHG – How to find out maximal boost of your turbo

The Ultimate Question in (tuner's) Universe - How much boost is too much boost? How much boost should I run? How much boost my turbo can take? You name it...you asked in various forums but they just told you +/-6% is ok - is it really? In the beginning - [...]

ECU remap guide for beginners – HOW TO NOT destroy your car

Right now, I'm preparing third version of ECU calibration data for latest car Skoda Hilda HR I (full ECU remap history). Two years of intensive studies, following masters and hours of testing on alpine roads...I'm looking back what I used to do wrong as beginner and what sort of disillusion [...]

Warning

Warning KNOW IS DO – if you must think you have no idea what you doing !!! THIS IS WEBSITE IS ABOUT HARSH REALITY – we don’t care about truth, lies, theories…ONLY ABOUT FACTS PROVEN BY REAL EXPERIMENTS IN FIELD. YEARS OF DESTROYED MATERIAL, HEALTH… I DO NOT INTEND TO OFFEND […]

BHG – calibration data calculators

Calculators for BHG articles that hopefully make your car hacking easier and improve your understanding of engine calibration aka chiptuning. PLEASE READ WARNINGS BEFORE YOU PROCEED !!! IF YOU FIND INFORMATIONS USEFUL, PLEASE CONSIDER DONATION. BHG calculators Interpolation of calibration maps Basic data gathering calculations - digging data from maps [...]

BHG – ECU remap facts & myths

Some facts and myths about ECU re-calibration aka ECU remap or chiptuning. Harsh reality of chiptuning/ECU remap that nobody wants you to know. It looks like that very few want to see reality. PLEASE READ WARNINGS BEFORE YOU PROCEED !!! IF YOU FIND INFORMATIONS USEFUL, PLEASE CONSIDER DONATION. SUMMARY everything [...]

Dyno is marketing hype

Everybody loves dyno graphs and performance figures. After all, HP sells cars. Based on my experience, I do not wonder - most ask me for unreal results such as 200PS from 140PS factory engine...they even get upset if I share facts about so called chiptuning. PLEASE READ WARNINGS BEFORE YOU [...]

Skoda Octavia II (1Z3) – ECU remap v7.xx

This is history of version 7 series of ECU remap. Most likely end of line for Hilda HR I. Almost everything is understood and shared on HR web page such as BHG. PLEASE READ WARNINGS BEFORE YOU PROCEED !!! IF YOU FIND INFORMATIONS USEFUL, PLEASE CONSIDER DONATION. SUMMARY new Sachs [...]

Skoda Octavia II (1Z3) – ECU remap v6.xx

I still have issues with engine overheating despite improved cooling. I am starting to understand why manufacturer keeps high AFR. In theory 14.5:1 stoichiometric ratio is optimal for diesel fuel but in reality it smokes and overheats engine. This is history of version 6 series of ECU remap. PLEASE READ [...]