| Author | Topic |
|---|
Registered:
June 2002
|
 Funny Story
|
Wed, 24 July 2002 00:57
|
 |
About 2 years ago I had a oversized crank pulley fitted to my 4agze. I was told it was a HKS. I was getting 10psi so i never questioned it.
Yesterday i pulled it out to replace it with a larger one only to find "this is the funny bit" it was a 175mm CUSCO !
Can u believe it.
My only problem now is why am i only getting 10psi.
|
|
|
Location:
Sydney
Registered:
May 2002
|
|
Re: Funny Story
|
Wed, 24 July 2002 01:31
|
|
Put a smaller pulley on your super charger and you will get more boost. Putting a bigger pulley on your crank will also make your other pulley's turn faster (i think??) which wont be too good for your alternator etc.
Jamie.
|
|
|
Location:
Western Sydney
Registered:
May 2002
|
|
Re: Funny Story
|
Wed, 24 July 2002 07:27
|
|
Could be a few things...
What engine have you got, AFM or MAP?
Have you disabled the abv?
Your belt isn't slipping?
Have you done something to the intake?
Could be your guage is a bit out.
Most people get around 12 psi with the 175mm pulley. A bit less if there is a front mount intercooler. Yeah the bigger crank pulley makes your water pump spin faster but isn't too much of a problem.
|
|
|
Location:
Canberra, ACT
Registered:
May 2002
|
|
Re: Funny Story
|
Wed, 24 July 2002 11:43
|
|
Speaking of slipping belts... if I was getting belt slip around 6500, would that mean that I'm also getting minor slip further down the rev range and loosing boost?
-Andrew
|
|
|
Location:
Perth WA
Registered:
July 2002
|
|
Re: Funny Story
|
Wed, 24 July 2002 12:18
|
|
| whiteGZE wrote on Wed, 24 July 2002 5:27 PM |
Could be a few things...
Yeah the bigger crank pulley makes your water pump spin faster but isn't too much of a problem.
|
Sorry but i gotta disagree with that statement, speeding up the water pump makes the pump less effecient, thus more chance of over heating which is always a bad thing cos heat=less HP
Cam
|
|
|
Location:
Sydney
Registered:
May 2002
|
|
Re: Funny Story
|
Wed, 24 July 2002 13:47
|
|
Thats correct! Because the crank pulley is driving all the other pulleys it affects them all. By changing just the s/c pulley you are only affecting it as it is driven (not driving!)
Jamie.
|
|
|
Toymods Board Member
I supported Toymods
Location:
Turramurra, Sydney.
Registered:
May 2002
|
|
Re: Funny Story
|
Wed, 24 July 2002 14:16
|
|
I'm pretty sure Matt understands all that, he's probably going on the history of bigger pulleys on ZEs.
I've never heard of a ZE suffering from overheating problems with bigger pulleys, and it seems the majority of aftermarket pulleys for ZEs are crank pulleys, although there are some smaller charger pulleys. I think it would be very rare for a pulley to adversly affect a ZEs temp, if it did, it would prolly come down to some other problem in the cooling system that only just managed with a smaller pulley.
Zed, have you ever suffered from overheating probs?
|
|
|
Location:
Perth WA
Registered:
July 2002
|
|
Re: Funny Story
|
Wed, 24 July 2002 14:35
|
|
|
yeah in everyday driving thats correct, but if the car is getting used at high RPMs constantly then a smaller water pump pulley is a good start for overcoming overheating problems
|
|
|
Location:
Western Sydney
Registered:
May 2002
|
|
Re: Funny Story
|
Wed, 24 July 2002 14:49
|
|
Thanks Joel 
That is exactly what I meant by that statement.
Of course I understand that a faster spinning water pump can lead to lack of coolant flow through the engine thus causing to overheat.
My point being that majority of people with the 4agze engines are running the 175mm crank pulley and I have not heard of overheating problems and some have run them over 3 years. If this modification constantly caused engines to overheat then they wouldn't be so popular.
Something else to think about is that many modifications that increase the hp of an engine will lead to a greater likelihood of a component failure. So yes there is that extra possibilty of overheating.
Mr TA22 you incorrectly stated that the alternator would be spinning faster. This is not true as the alt/ac/ps are on a spearate belt.
The reason people rarely use a smaller s/c pulley is because there is an electromagnetic clutch behind it that does not make a smaller pulley easily adapted unless you scrap it.
Raskas I think you meant to say a larger water pump pulley. Yes there are larger water pump pulleys available but if you fit the 175mm pulley there is no room for one.
|
|
|
Registered:
June 2002
|
|
Re: Funny Story
|
Thu, 25 July 2002 03:11
|
|
|
Not 100% which one it is, AFM or MAP, has coil packs with the raised pully on the SC, i think its the afm. Running aftermarket EMS so i dont have the afm connected. Looking into the ABV and getting a new belt put on (really tight i hope)at the moment.
|
|
|
Registered:
June 2002
|
|
Re: Funny Story
|
Thu, 25 July 2002 03:18
|
|
Considering its been on there for a couple of years now without me even knowing, never had a overheat problem, and i use it everyday, actually have done quite a few km with it on.
Would love to find a smaller sc pulley, but havent found much info on them.
|
|
|
