How to modify cars? Especially on the under hood performance, this is a list of engine performance modification suggestion from Dori Dori Auto Works.
The first stage of engine modification to increase engine pickup, power and response includes
1) drop in air filter : open pod air filter like simota or k&n
* improves engine brething, increase power and engine response.
2) spark plug cable performance parts
* imporove engine response, better cold start, reduces voltage fluctuation from ignition coil to spark plug.
3) iridium spark plug Denso Iridium IT20
* better firing power, more powerful and cleaner combustion
4) voltage stabilizer
* improves engine response, more stable bettery voltage, reduces voltage drop from additional accessories.
5) custom exhaust work
* increases engine performance, suits Automatic and Manual transmission cars without sacrificing comfort and fuel economy. 4-1 for manual and 4-2-1 exhaust system for auto car
6) grounding body polish : swap basis with T/Body learning
*Better throttle response, increases engine response.*Re-adjust idle speed to factory setting
Our other suggestion:
7) engine grounding cable
8) exhaust extractor without catalytic converter
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4-2-1 is most suitable to any transmission because this set up will produce more HP in the same time will have a good torque for the entire RPM band..
4-1 btw is more suitable for high rev engine. for who likes to go above 5000rpm all the time =)
most important is the extractor length, must be exact for each output to prevent back pressure in the exhaust system. of course without the CAT we will have more HP
just my 2 cent no harm =)
my waja is CPS-manual, firstly replaced 4-1 extractor without catalytic converter, then add Razin voltage stablelizer in-out plus Ultra-Racing front bar stablelizer. I can feel a little bit more tork & power.
A few weeks later, just replaced light cram-pulley and iridium spark-plug from NGK, feel the tork has been dropped 10-20%. Then exchange with Denso IT20, same result. I’m going to change back normal NGK plug (v-type).
Also just replace drop-in K&N air filter, not much different.
Any comments from