I'm sure a lot of you out there heard of 'Unichip'... It is a piggyback ECU made for petrol and diesel engines... It is famous for it's capabilities which almost matches a standalone!!! But too bad it is not so famous in 'Malaysia' as there are not a lot of tuners around... Unlike 'Greddy' famous 'E-Manage', you will need a special equipment to adjust the fuel...
Found myself a good used unit of 'Unichip Q' (not the latest... latest one is Q+) and decided to give it a try... I always like to be different and I'm those who don't like to follow the norm!!! When I first got a glimpse of the unit, I was shocked as it looked really small!!! It felt very solid and tampering is almost impossible as there's not a single screw in sight!!!
Since only a handful of tuners around, I decided to go to one of the most reputable one which is located in 'Sunway'...
Besides being compact, the amount of wiring needed to hook it up is as minimal as possible!!! Just a few wiring required to be tap onto the original ECU...
During setup, the tuner encounter some problems with the 'Unichip'... The whole unit went limp and it can't detect anything at all... There is no communication between the 'Unichip' and the laptop!!! At first, we thought the problem might come from the 'Dastek' fuel controller device... Borrow one from another workshop and the same thing happened!!! Plugged in another 'Unichip' albeit an older version and there's communication between the two devices... So meaning my unit is faulty then!!! Damn...
So the tuner decided to do a reset and flash it again... Insert the require map and viola there's communication!!!
Strapping onto the dyno machine and is time to find out how much horsepower the '1JZ' is churning out!!!
In standard form, the '1JZ' is churning out slightly less than 200ps on wheels which is around 253ps on engine (base on 30% transmission and drivetrain lost)... Looking at this figure, I'm pretty sad (but is normal for a standard '1JZ' to put out these kind of numbers) as 'Toyota' quoted 280ps on standard '1JZ' engine... Currently I'm running on 'RON 95' instead of 'RON 97' so I assume there's some number lost because of the lower 'RON' rating as 'Japanese' like to use 'RON 100' for their performance engine!!!
After tuning with the air fuel ratio (original ECU is way too rich!!!) and retarding a few degrees of ignition timing due to knocking and also increased the boost from the standard 0.8 bar to 1.0 bar, the '1JZ' churn out a respectable 246.52ps on wheels which is around 320ps on engine... Not too shabby!!!
After tuning, the whole car seems lighter and no more boost cut!!! Normally it cuts at around 0.9 bar... The torque is much stronger as well as the car pulls much harder compare to before... As a conclusion, piggyback ECU is a MUST for turbocharged cars as it liberate a lot of power just by turning up the boost a bit and dialling the air fuel ratio...
To be continue...
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