Need Advice for Adjustable Cam Pulley (DOHC Engine)

szeeonn

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szeeonn

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to all pro zth member

usually u all Set how much Cam pulley timing for adjustable Cam Pulley (DOHC) Engine ..?

how much Degree u all advance ?

Intake ..?
Exhaust ..?

need sincere advice for GSR and EVO Engine

tq ^^
 

Veloc

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Veloc

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Erm... For me, I think adjustable pulley is not v good for everyday car la... Because by just advancing/retarding the timing, there is little power gain. Got la.. But not so much... The obvious effect is the shifting of the powerband. This is because earlier opening or valves also result in earlier closing. The lift, duration and overlap is unchanged. Thus power gain is minimal and the main function is shifting the powerband, either higher up the rpm range or lower. Why not save up and get camshaft?

Just my opinion la... Anyways, mudah got sell a lot. Some claim to be HKS lightweight ones but don't know ori or not. Works engineering got also. That one most probably ori la... :biggrin:
 

0382

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0382

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Erm... For me, I think adjustable pulley is not v good for everyday car la... Because by just advancing/retarding the timing, there is little power gain. Got la.. But not so much... The obvious effect is the shifting of the powerband. This is because earlier opening or valves also result in earlier closing. The lift, duration and overlap is unchanged. Thus power gain is minimal and the main function is shifting the powerband, either higher up the rpm range or lower. Why not save up and get camshaft?
i agree...
 

szeeonn

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szeeonn

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good one . usually which cam profile better ?
272/272 or 270/260

heard 270/260 timing idle better , any comment ?
 

Veloc

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Veloc

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good one . usually which cam profile better ?
272/272 or 270/260

heard 270/260 timing idle better , any comment ?
For intake... Nothing more than 272 is best. 260 is fine too. More low end torque. 272 is minimum for good idle and low torque. About exhaust, I don't know. any sifu can advise on this? :hmmmm:
 

szeeonn

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szeeonn

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hmm now i am confusing for Exhaust Cam..
dont know whether should choose 272 , or 260 ...?

pro fren say exhaust 260 would stable for idle for air cond
another racer fren say choose 272 for exhaust , FOR Turbo engine ..

need more advice from pro ^^
 

Veloc

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Veloc

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hmm now i am confusing for Exhaust Cam..
dont know whether should choose 272 , or 260 ...?

pro fren say exhaust 260 would stable for idle for air cond
another racer fren say choose 272 for exhaust , FOR Turbo engine ..

need more advice from pro ^^
Bro... first, you plan to go NA or turbo? If youplan to go turbo, don't go for too much valve overlap. If you plan to go NA all the way, chose max overlap. But still depends on how much low-end torque, FC and city drivability you willing to sacrifice la...
 

szeeonn

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szeeonn

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mine is 4g93 gsr turbo ..
u mean dont go too much valve overlap .. means i should choose 260 or 270 for exhaust ?
haha , thank u
 

D7zul

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D7zul

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mine is 4g93 gsr turbo ..
u mean dont go too much valve overlap .. means i should choose 260 or 270 for exhaust ?
haha , thank u
interesting question.. cuba citer.. cuba citer.. :biggrin:
 

Veloc

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Veloc

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mine is 4g93 gsr turbo ..
u mean dont go too much valve overlap .. means i should choose 260 or 270 for exhaust ?
haha , thank u
All I heard before is that if want to play turbo, there should be minimal valve overlap. The intake should stay open longer but exhaust should be should be shut earlier to prevent boost leak. That is for turbo. However, I can't advise on the exact duration and lift as I have no experience on this before. Hope other sifus with experience can give input.

But if you plan to play NA, go ahead and get the max overlap as far as you can stand the decrease in low-end torque. But I heard anything above 272 will be costly as you also have to upgrade the valve springs, higher compression and port and polish, and piggyback to get the best performance.
 

szeeonn

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szeeonn

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ooo.. finally i understand you
u suggest me take 270/260 .. ?

tq
 

Veloc

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Veloc

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ooo.. finally i understand you
u suggest me take 270/260 .. ?

tq
No bro... I suggest get opinions form sifus who got experience... :burnout:
 

szeeonn

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szeeonn

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sifu sure say higher better lol .. but i only scare the timing nia
well u know .. daily car scare timing issue
 

93na

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93na

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for 93t or 93na...

turbo 272 is the best wan la any lower u dont really feel the diff...

Na 300 and above la(he he he)...

matspeed 272 is good enough for daily drive for 93 engine.. I have used it before..
 

szeeonn

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szeeonn

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for turbo
u have been using mat speed 272/272 ?

how's the timing issue ?
only worried timing issue lol
 

D7zul

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D7zul

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Back to the adjustable cam pulley ..

the purpose of it is to adjust the timing to increase power at certain RPM.. not all the way from 1k - 10k..

eg.
15degree advance to increase power at 1k - 5k..
0 degree to increase power at 5k - 10k..

it also depends on what engine u use.. not all engine respond to the setting the same way.. because of their design..

and also if u use big cams such as 272/260, u must rev very high to achieve the desired horsepower.. NA tuned..

for turbo usually they use bigger turbo.. or twinturbo..

i suggest find a good tuner for ur engine & learn from them..

Gudluck :burnout:


For Toyota 4AGE engine read this

http://www.billzilla.org/4agmods.htm
 

Veloc

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Veloc

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Back to the adjustable cam pulley ..

the purpose of it is to adjust the timing to increase power at certain RPM.. not all the way from 1k - 10k..

eg.
15degree advance to increase power at 1k - 5k..
0 degree to increase power at 5k - 10k..

it also depends on what engine u use.. not all engine respond to the setting the same way.. because of their design..

and also if u use big cams such as 272/260, u must rev very high to achieve the desired horsepower.. NA tuned..

for turbo usually they use bigger turbo.. or twinturbo..

i suggest find a good tuner for ur engine & learn from them..

Gudluck :burnout:


For Toyota 4AGE engine read this

Bill Sherwood's Modified 4AGE Page
Haha... That page is my early source of knowledge too... Still very useful! :burnout:
 

93na

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93na

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i agree to that.. a good tuner is the answer.. he be able to advice you on to do.......
 

szeeonn

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szeeonn

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hmm guys ..
which cam suitable for my turbo
270/260 or 272/272

tq
 

D7zul

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D7zul

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hmm guys ..
which cam suitable for my turbo
270/260 or 272/272

tq
Mayb u can list down what u've done with ur engine so far..

1. What engine?
2. Stock turbo or aftermarket one?
3. How much boost?
4. Exhaust header & pipe?
5. Air filter?

because tuning an engine is about balance.. not like add this = add power.. sumtimes we add sumthing, the power goes down..

:driver:
 

szeeonn

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Mayb u can list down what u've done with ur engine so far..

1. What engine?
2. Stock turbo or aftermarket one?
3. How much boost?
4. Exhaust header & pipe?
5. Air filter?

because tuning an engine is about balance.. not like add this = add power.. sumtimes we add sumthing, the power goes down..

:driver:
4G93 Turbo , E3 turbo , Want to boost 1.3 , exhaust Banana pipe 2.5 inch bend (2wd tank)
air filter ? got kena mengena ? i dunno lol .. i din install air filter yet .

tq
 

D7zul

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D7zul

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4G93 Turbo , E3 turbo , Want to boost 1.3 , exhaust Banana pipe 2.5 inch bend (2wd tank)
air filter ? got kena mengena ? i dunno lol .. i din install air filter yet .

tq
max cam size u can go with aircond is 270/260 duration, 10.00mm Lift..

and u might need an aftermarket ECU to tune it well..

air filter restrict air intake.. so, u'll loose power if u use the standard one..

Gudluck :burnout:
 

szeeonn

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szeeonn

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nice info bro ..
bro if i put in 270/270 .. would effect car engine timing?
the timing will up down up down ..?
or how ?

coz if power concern, 270/270 more power right ?

i am going to Emanage after put in hi cam
 

D7zul

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D7zul

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nice info bro ..
bro if i put in 270/270 .. would effect car engine timing?
the timing will up down up down ..?
or how ?

coz if power concern, 270/270 more power right ?

i am going to Emanage after put in hi cam
yes, it will effect ur timing..

better go for 270/260
 

szeeonn

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szeeonn

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haiz . i also pening2
ppl say exhaust ?MUST LARGER becoz need more exhaust gas spool the Turbo

so now i am very confused ..
 

szeeonn

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szeeonn

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u order online ?
from australia ?
how much it takes you ?
 

xtremeleo

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xtremeleo

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i adjusted my pulleys and was able to produce up to 90lbft on a std 4g91, two set of mountings were damaged/broken on the first day. i had to leverage out the torque curve across the revv range or i am risking yet another set of engine mounts, lol. now using full rubber racing mounts, but wit top end setting, for dat peace of mind

so, no big difference? i dont think so..
 

D7zul

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D7zul

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u order online ?
from australia ?
how much it takes you ?
no la.. i dont own a 4G93 Turbo..

what i meant was my reference come from that website..

u can find the same cam at Sunway, etc.. and i think it's cheaper..

Gudluck :burnout:
 

Slowboy

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272 should be maximum for stock engine if not you will not have enough vacuum in idling, also your engine will stall at low rpm unless you willing to go for above 1k at idling. My opinion get 264/272 for response cam.
 

szeeonn

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szeeonn

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hmm .. ? i wonder where to get high cam that is Intake lower Exhaust Higher
Custom made ? any recommendation ?