4G91 Gang..

[fstr]

g92 ask calvin laa

g93 ask somebody else laa cos me still newbie

sure it will improve joe cos thats the heart of the whole car..without pistons how ur engine and car gonna run? :hmmmm:

 

[ACQ2305]

bro joe....

abt the pistons.....
i guess its safer to just change block....
u can opt to do it the legal or illegal way.......
a 92/93 block without custom form could b quite cheap sometimes....
ask uncle fred abt it la.....
heehee

bt by doin tat,d engine cnnt b considered a 91 anymore...heheheee....

 

[ACQ2305]

Based on manual,
4g91 bore is 78.4mm, CR 9.5:1
4g92sohc bore is 81mm, CR 10.0:1
4g92Mivec bore is 81mm, CR 11.0:1
4g93Dohc bore is 81mm, CR 10.5:1

Eventhough the bore size is the same for all 4g92 & 4g93, its piston crown design is different from one to another.. Such as a 4g92sohc piston in a 4g93 will increase its CR to probably in the region of around 11:1.. this is what i was informed la..

is der a limit 2 hw much,or hw big can a 91 block b bored?? 78.4mm to 8mm seems like alot... bt imagine a 91 engine wit a higher comp.hehehhee..nice. 9.5:1 to 11.0:1

 

[ayell]

I've done the rebore to 81.5mm (81.5 - 78.4 = 3.1mm) allowable and recommend by manufacturer only 1mm :P
Been thrashing it almost 3 years now without a problem! Just a tiny bit higher on water temp.

 

[ayell]

erm.. bought it for rm80.. at advan racing sban.. very famous shop this one

Joe_mirage, are you stay in Seremban?

 

[eci4ever]

I've done the rebore to 81.5mm (81.5 - 78.4 = 3.1mm) allowable and recommend by manufacturer only 1mm :P
Been thrashing it almost 3 years now without a problem! Just a tiny bit higher on water temp.

are u using coolant in ur radiator? Currently, what is ur water temp?

TQ. :-)

 

[calvin9683]

well....
of course can use 91 head wif 92/93 block.....
as for power wise....
u dun expect the same la.....
sure will b lower one.....

how to say ler.....
the wiring n ecu is set to giv the enuf supply for 91....
then u go in increase to 92/93.....
the air/fuel mixture will b blur la.....

this is wat i experienced last time....
till i get the emanage.....
guess this also explains y i can get such high increase by fine tuning la....
its like extracting the true potential of all my past mods.....

just sharing la...
hope u guys get wat i mean....
heehee

 

[calvin9683]

bro ayell hardcore seh.....

ACQ...
guess we need to add "R" behind....
4G91"R"....
"R"=rojak!!!

 

[fstr]

mine 91 head, 93 cam, 93 block, 93 injector, 93 IM, reprogrammed stock 91 ecu (cos no money buy e-manage, haltech,motec, unichip & etc) and 1.3 manual standard gearbox.

running very well after putting in 93 injector and no more lean mixture, torque is there and better then standard 91.. done this after only 1 month on 91 as i dont feel much comparing to my previous 4g15 single cam.

 

[ayell]

are u using coolant in ur radiator? Currently, what is ur water temp?

TQ. :-)

Yes of kos i used coolant, my car is iswara, small radiator so need to change to double layer, as u notice 1.6 use wider radiator. My water temp when idle is about 80 C and raise up to 90 C if I speed 140km/h and above. But it will not going further up, maintain at 90 C

 

[calvin9683]

wah...
unker fred's pick up sure chun la...
using 4g13 gb.....
got masuk LSD ma???

i wanted to reprogram last time....
but then seems like dat fella dun hav chip for 4g91 ecu....
change the chip edi engine check light on....
n car feel underpower.....
end up din do the reprogram...
n hav to save up for emanage....
heehee.....

if not mistaken.....
there;s 2 type of ecu for 4g91...
1 can b reprogram...
another cannot...
heehee......

ori 4g91 radiator is aluminium wei.....
but then still not sufficient to support la....
i was facing temp prob when i just change block....
end up change to double layer radiator....
add more weight pulak...
hahahaha

 

[syahizad]

hai guys..
if i planning to installed safc in my 4g91.. OK ka?

 

[ACQ2305]

bro ayell hardcore seh.....

ACQ...
guess we need to add "R" behind....
4G91"R"....
"R"=rojak!!!

true true, new breed of 4G engines...hahahaa....

 

[ACQ2305]

I've done the rebore to 81.5mm (81.5 - 78.4 = 3.1mm) allowable and recommend by manufacturer only 1mm :P
Been thrashing it almost 3 years now without a problem! Just a tiny bit higher on water temp.

huh? recommended only 1mm?? tot it cud go abit more... good mechanic u hav der...wat kind of pistons u usin? any difference?

 

[joe_mirage]

bt by doin tat,d engine cnnt b considered a 91 anymore...heheheee....

egegege.. it is 4g9R... if BOT becomes 4g9RT

is der a limit 2 hw much,or hw big can a 91 block b bored?? 78.4mm to 8mm seems like alot... bt imagine a 91 engine wit a higher comp.hehehhee..nice. 9.5:1 to 11.0:1

i think max is 3mm.. 1.5 with high comp??? erm.. delicious

Joe_mirage, are you stay in Seremban?

yups, im from sban but currently in cyberjaya since im studying there ... hope can test drive ur car man..

btw... now u have how many extra cc???

well....
of course can use 91 head wif 92/93 block.....
as for power wise....
u dun expect the same la.....
sure will b lower one.....

how to say ler.....
the wiring n ecu is set to giv the enuf supply for 91....
then u go in increase to 92/93.....
the air/fuel mixture will b blur la.....

this is wat i experienced last time....
till i get the emanage.....
guess this also explains y i can get such high increase by fine tuning la....
its like extracting the true potential of all my past mods.....

just sharing la...
hope u guys get wat i mean....
heehee

need to save money :).. starting tmorrow i'll eat maggi...
emanage : will help a lot when i wanna BOT + high cam...
but when will it be?

 

[joe_mirage]

mine 91 head, 93 cam, 93 block, 93 injector, 93 IM, reprogrammed stock 91 ecu (cos no money buy e-manage, haltech,motec, unichip & etc) and 1.3 manual standard gearbox.

running very well after putting in 93 injector and no more lean mixture, torque is there and better then standard 91.. done this after only 1 month on 91 as i dont feel much comparing to my previous 4g15 single cam.

egegege.. of coz maa.. last time ur g15 got webber summore .. fully moded one

btw unker, r u satisfy after changing block???? come2x share unker.. im really into it

 

[fstr]

egegege.. of coz maa.. last time ur g15 got webber summore .. fully moded one

btw unker, r u satisfy after changing block???? come2x share unker.. im really into it

sure satisfied lor, if noti wont change ma

"there is no replacement, for displacement"

 

[calvin9683]

bro joe...
there;s a will there's a way....
sure will hav chance one la....
dun worry......

81.5mm pistons......
displacement more than 1600cc edi la....
perhaps its edi close to 1800cc huh???
heehee

 

[fstr]

mod macam bro calvin laa joe, sure power gilababi one

 

[joe_mirage]

bro joe...
there;s a will there's a way....
sure will hav chance one la....
dun worry......

hahah... thanx.. when there's a will, there's a way

81.5mm pistons......
displacement more than 1600cc edi la....
perhaps its edi close to 1800cc huh???
heehee

maybe 1.7L... 4g9R 1.7L Twin Cam

mod macam bro calvin laa joe, sure power gilababi one

unker and calvin.... u two guys mmg otai!
that's why if i have probs regarding mods.. i like to turn to u guys