Car modification from 1000cc to 1300cc vitz 2004

pwuser156913218229 (Khattak) 2021-01-28 23:35:28 +0500 #1

I recently modified my engine from 1sz fe to 2sz fe engine. The assembly is brand new and in a very good condition but it does not accelerate smoothly after 130km/hour as a 1300cc engine should. The gear and icu are old though in low gears the pick and acceleration is awesome.
Wat can be reason can anybody tell ?

aziz.rehan (Rehan Aziz) 2021-01-28 23:48:33 +0500 #2

Get it tunned

pwuser156913218229 (Khattak) 2021-01-28 23:50:12 +0500 #3

What kind of tuning normal engine tuning ?

Hassan1991 (Electrical Engineer ) 2021-01-29 00:31:11 +0500 #4

Which ecu it's running on? Old ?

pwuser156913218229 (Khattak) 2021-01-29 00:44:10 +0500 #5

Yes 1sz fe ecu

pwuser156913218229 (Khattak) 2021-01-29 00:46:50 +0500 #6

Hassan1991 (Electrical Engineer ) 2021-01-29 00:49:58 +0500 #7

Swap it with 2szfe, it will start running like a 1.3.

pwuser156913218229 (Khattak) 2021-01-29 00:52:50 +0500 #8

I inquire for they say that 2sz fe ecu u have to change complete wriring as this engine comes with cvt gear. I am currently running it on my previous gear atf whith 1sz fe ecu. Now i dont whether they understand the technicality of it or not
Is this true ?

syedzain265 (syed zain) 2021-01-29 00:57:32 +0500 #9

That is atf.1.3 was to be mated with cvt for smoother delivery.I suppose your rpms at 130 plus would be close to redline
Do you feel that car accelerates more from 0 to 100.More than a 1.3 auto should.

pwuser156913218229 (Khattak) 2021-01-29 01:01:24 +0500 #10

Okay brother got it
What do u suggest now should i install 2sz fe ecu with the same atf gearbox or not ?

pwuser156913218229 (Khattak) 2021-01-29 01:02:35 +0500 #11

No in normal acceleration i do not though on full throttle it does

syedzain265 (syed zain) 2021-01-29 01:04:22 +0500 #12

Brother it would have been better if you got the whole setup with gearbox and wiring but whats done is done.
Better option would be to drive it as it is.
BTW it is not a very big issue and I must say not very noticable either if you drive in city traffic.
Getting a cvt gear in good nick is a pain in the ass that what im saying
Stay with the original gearbox thats better

pwuser156913218229 (Khattak) 2021-01-29 01:05:52 +0500 #13

Ok ok i understood thanks a lot for your suggestion.

Hassan1991 (Electrical Engineer ) 2021-01-29 02:42:20 +0500 #14

2szfe does came with 4 speed automatic transmission in vitz.

tuneupgo.pk (TuneUp Go) 2021-01-29 04:52:10 +0500 #15

Perhaps he's looking for Belta ECU with 2sz that is CVT
There is no conventional automatic transmission in any of 2sz versions (Chasis code SCP13)

4 speed automatic transmission comes with 2NZ-FE (chasis code NCP10)

With 2SZ, he will have to switch the ECU (part number 2120006660) and CVT transmission K410-D3A579

pwuser157677247953 (PWUser157677247969) 2021-01-29 12:43:37 +0500 #16

Bhi Kitna Kharcha Aya Ha?

asghar1075.dev (devasghar) 2022-09-11 19:46:22 +0500 #17

Dear how was ur experience with just changing the assembly without gear and ecu. Any problems u faced without top speed? My mechanic also proposed such swap. Please reply should i go with ths????