User Review: Comparo of diesel tuning boxes

Prabhakar Rao, our MotoRep for Hyderabad, recently carried out an exhaustive test of performance tuning boxes. He tested a variety of diesel tuning boxes on a multitude of cars. Here’s what he managed to find out after 6 long months of continuous testing and analysis.

Prabhakar AVR image

Prabhakar AVR

Diesel Tuning Boxes are an easy solution for the people who want some extra power with minimum hassles. In simple terms it is a small box (Resistor, Potentiometer, etc.) which tries to FOOL the ECU in pumping more diesel into the engine.

It is primarily preferred because of its ease of installation & removal. Any person who can drive a car can install & uninstall it in 5-10 minutes. It usually does not leave any error codes when scanned with an OBD Scanner. However it has its own advantages & disadvantages.

In the market there are numerous Tuning boxes claiming that they have the best Box. They simply claim they boost the power by crazy numbers at the same time increasing the fuel efficiency. When someone tries to purchase a box they have lots of options & claims which confuse the Potential Buyer.

To make things easy we did a full test of some available boxes. These boxes are either sourced from the makers or taken from the customers who purchased them. We tried our best to perform these tests in identical conditions.

The comparison is to check the

1.    Drivability
2.    Mileage
3.    Performance overall
4.    In-gear Acceleration
5.    Turbo Lag
6.    Acceleration figures 0-60
7.    Acceleration figures 0-100
8.    Acceleration figures 0-150
9.    Top Speed
10.    Refinement
11.    Pollution
12.    Price

The list of tuning boxes in comparison is:

1.    Pete’s
2.    Tunit
3.    Unichip
4.    Race Dynamics
5.    Race Chip

We chose the Fiat engine for the test as it can be called the national engine of INDIA with maximum number of vehicles ( Fiat Grande Punto, Linea, Palio, 500, Tata Indica Vista, Manza, Maruti Swift, Ritz, Dezire, SX4) running with it. The Chevrolet Beat also has the same engine with 3 Cylinders. Moreover Fiat sold 4 million units worldwide.

Cars used for the comparison are –

1.    Punto 90hp
2.    Punto 75hp
3.    Indica Vista Quadrajet
4.    Indigo Manza Quadrajet 90
5.    Old Swift

Then we struggled for 6 months with the boxes to test all the parameters.Coming to the results we do not have a clear winner on all the parameters.Each parameter has a different winner, runner up, etc.

So it’s the customer who has to weigh down the importance of each parameter & then decide which box to go for.

The winners in each parameter –

1.    Drivability – Unichip
2.    Mileage – Race Chip
3.    Performance – Pete’s
4.    In-gear Acceleration – Pete’s
5.    Turbo Lag – Unichip
6.    Acceleration figures 0-60 – Pete’s
7.    Acceleration figures 0-100 – Race Dynamics
8.    Acceleration figures 0-150 – Race Dynamics
9.    Top Speed – Race Chip
10.    Refinement – Race Chip
11.    Pollution – Race Chip
12.    Price – Race chip

Made a point system based ranking which makes up for a winner here. Each of these factors has 5 points.Winner in each category will get 5 points; second will get 4, so on…

The one with maximum points is crowned as the overall winner.

Ranking with Name & total points.

1.    Pete’s – 33
2.    Race Dynamics – 28
3.    Race Chip – 26
4.    Unichip – 21
5.    Tunit -12

This is a general comparison. However depending on your order of preference the rankings will change. For example –

The cheapest is Race chip so it got more points & costliest is Unichip so it got fewer points. Race chip gave the best mileage while Tunit gave the worst. If Price & mileage are of high importance then I’ll chose Race chip.

In- gear acceleration & 0-60 are best in Pete’s so I’ll chose Pete’s if I drive only in city & performance is my only importance.

So if some 1 wants an advice to purchase a tuning box please mention order of importance for the following parameters.

1.    Drivability
2.    Mileage
3.    Performance overall
4.    In-gear Acceleration
5.    Turbo Lag
6.    Acceleration figures 0-60
7.    Acceleration figures 0-100
8.    Acceleration figures 0-150
9.    Top Speed
10.    Refinement
11.    Pollution
12.    Price

We’ll be able to give you the closest match for you.

However we got a couple of new boxes coming up & some newer versions of the existing boxes which will be tested in the next few weeks & the results updated.

The Whole test is sponsored my Motul Engine Oils.

You can discuss & follow it in Motoroids TALKS section

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Good Analysis..


Thank you for your kind words, Naushad.



I own Fiat Linea 1.3 and exploring my options on buying a performance chip for my car. I am almost finalized with Race Chip but before I order the chip, I would like to know the disadvantages post installing the chip.

Will be there any negative effect on my engine.

I am happy with the mid and top range of my car but worried about the initial pick up.

Your suggestion would be appreciated.


Pradeep J


please suggest tunning box for my toyota liva 1.3546ltr diesel


Hi I have a BMer E90 320D (2011) It is still under warranty. I have seen mixed posts about BMW being able to detect that a chip box was installed. Can you guys substantiate on this and set my mind at ease. I am eager to purchase and install a chip box, however I am wary that the dealer might find out, hence causing me to lose my warranty.




Hi Team, I have a Ritz VDI 2010. the only issue I ever wanted to overcome (apart from the rattlings in the car) is the turbo lag and the Low Acceleration in 1st and 2nd gear. Please help me with the Best tuning box for this. Though I don't mind if the fuel efficiency doesn't increase, But it should not decrease. Thanks Sasideep


Hi Sasideep. We reckon the Pete’s box will meet your requirements the best.


Is RaceChip One good for Ford Figo 1.4 TDCI.