Saturday, May 23, 2009

efi tune up 1.4...

this time we attack the intake side... throttle body...



the original throttle body that came with the injection package had just 46mm in bore diameter... fairly suitable for standard 1.3L engine... but with the current displacement i'm having, i needed something bigger...

i was planning on getting a 50mm throttle body from 4g92p (1.6 wira) but the prices are kinda steep... halfcut shops are selling at approx Rm350 each...

fortunately i found someone selling this particularly rare throttle body from perdana sei which uses 4G63 SOHC engine... it measures 54mm in bore size diameter... price kinda cheap, Rm220 to be exact...



FYI, the ISC for 4G13, 4G15, 4G92p and 4G63 sohc is the same... hence, its plug and play...

installation was done at home by myself... bought new 0.8mm paper gasket to prevent air leak in between throttle body and intake manifold...



installation was abit tough because the coolant inlet and outlet piping is at the wrong position, blocked by the water temperature sensor... the usage of coolant flowing into the throttle body is to actuate the so-called "autochoke" function to ease cold start in the morning... in the end, i forced and twisted the metal piping away and bypass the coolant so that it does not flow into the throttle body...

i also made a crude heat shield protecting the plastic ISC unit from direct contact with the intense heat from the coolant hose running below the throttle body...



fired up the engine... soon after i found my idling rpm is vr high, approx 1.8k rpm... managed to turn down my idle rpm till the minimum by closing tight the idle air bypass hole and throttle spindle hold back screw... yet, my idle still maintain approx 1.2k and fluctuates 1.2k-1.5k when engine warmed up... my mechanic said too much air leaking through, hence causing the idle fluctuation... he suggested me to remove the ISC completely so not much air will leak through...

another problem i'm facing after swapping to larger throttle body is partial throttle response... the TPS that came with the perdana sei throttle body has 3 pinouts while original 1.3 throttle body has 4 pinouts... the previous seller recommend me to use back my original TPS...

the problem is... maintaining the TPS at stock setting, partial throttle has very bad response... as if throttle body isnt communicating with the ecu... this can be solved by advancing the TPS setting, but creates another problem... advance TPS setting will cause high AF mixture, hence deteriorating the fuel economy...

in the midst of giving up, i swapped the 4 pinout TPS with my 3 pinout TPS and see whats what...



to my surprise, the engine runs smoother than before... latest calculation gives me slightly better fuel economy compare to previous original 4 pinout TPS...

due to slightly larger intake, the engine AF mixture would had messed up... and yes it is... oversize throttle body is certainly letting too much air into the engine..



damn, i'm in desperate need of adjustable fuel pressure regulator to bump up the fuel pressure...

23 Comments:

Anonymous ronzai89 said...

u use 210cc injector so it will cause this? tot u say need emanage blue or AFC, u dun have ka?

9:03 PM  
Blogger SkYwAlKeR said...

gonna use my 210cc injectors when i have emanage lor... now no money buy emanage mar... u wan sponsor??

4:01 AM  
Anonymous ronzai89 said...

bukan FPR boleh liao meh.....

Unichip boleh tak =)

nt gua sponsor. hehheh

8:56 PM  
Blogger ~~AMZ~~ said...

hye bro...nice upgrading... ehehe got extra ke TB perdana SEi sohc tue..ehehe if got i want also.. ehehe

owh... dont forget to visit my blog also...ehehe

8:59 PM  
Anonymous mizi said...

helo, do u hav injection complete set for 4g15? MMC most welcome and vdo second intake, please contact me 019-9012344, wanna change from oldskol carb to efi

7:12 PM  
Blogger SkYwAlKeR said...

ronzai,
FPR cannot control la... it only increases the fuel pressure... cannot do much...

AMZ,
thanks... but i dont have extra TB perdana sei la... vr rare and hard to find...

mizi,
extra mmc injection set??.. quite hard to find... halfcut shop dont usually collect them as a set.. they sell parts separately... or u buy the efi engine complete...

3:32 AM  
Anonymous ronzai89 said...

ooh....then u continue pakai ur smaller cci ijector la =)

scare will harm your engine.

11:28 AM  
Blogger SkYwAlKeR said...

ronzai,
use smaller cc injector will make the engine run leaner lo... u want my engine blow meh??

4:41 AM  
Anonymous ronzai89 said...

so u use back stock liao la?

8:44 PM  
Blogger SkYwAlKeR said...

ronzai,
stock injector from 4g92p can consider??...

1:35 AM  
Anonymous ronzai89 said...

u not pakai it now meh......

4:16 PM  
Anonymous ronzai89 said...

bro u mean the mivec punya ah?

8:29 AM  
Blogger SkYwAlKeR said...

ronzai,
now i using 182cc stock injectors from 4g92p sohc engine... not mivec ler... mivec injectors are 240cc...

2:51 AM  
Anonymous ronzai89 said...

so u use tat, engine gott leaner mah?

my stock efi how many cc de ah?

7:28 AM  
Blogger SkYwAlKeR said...

yea... running abit lean... gonna add fuel regulator to push up the fuel pressure...

my stock injectors are only 145cc... different batch of 4g13/4g15 has different injector cc... do check out urs....

6:55 AM  
Anonymous ronzai89 said...

i dunno how to check wor....how ah?

5:43 PM  
Blogger mcrance said...

i want to install 4g92 throttle body single cam from original mitsubishi tb to my 1.3 intake..is it need to mod the kaki..coz i read some of forum need to fine from wira 1.6 xli tb that can fit with 1.3 intake..

12:28 AM  
Blogger mcrance said...

i want to install 4g92 throttle body single cam from original mitsubishi tb to my 1.3 intake..is it need to mod the kaki..coz i read some of forum need to fine from wira 1.6 xli tb that can fit with 1.3 intake..

12:28 AM  
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