pulley kit

[bluemaumau]

a friend of mines dads a engineer and has all the tools

im thinking of getting him to make my pulley smaller for more boost(AE92 4agze)

1. how big must the pulley be for 12-14psi?
2. if i get the pulley made smaller do i need a smaller belt? or do i just need to move the tensioner?
3. is there anything to watch out for, ive heard something about "harmonic balancing"

so basically where is evil_si?

no, but if you have any suggestions/ comments post away

[CAMB01]

You want to make the pulley larger not smaller. Larger pulley means more boost

[evil_si]

you can do it 2 ways,
direct drive and make a smaller drive pulley on the actual supercharger. will need a shorter belt.


make a larger crank pulley, size depends on if you want to change the waterpump pulley, will need a smaller tensioner and longer belt.

harmonically balanced is the type of pulley, not the way it is balanced.

some guys use solid alloy pulleys, i wouldnt as engines arnt cheap. they tend to fu.k engines quickly, to much loading on the crank,

[trueno_20v]

You want to make the pulley larger not smaller. Larger pulley means more boost

No dont you make the pulley smaller so it spins faster = more boost.

[gdsup]

just buy one of evil_si's, if you are unsure of the detail save yourself the time and hassle, buy it, bolt it ,drive it - done

[bluemaumau]

just buy one of evil_si's, if you are unsure of the detail save yourself the time and hassle, buy it, bolt it ,drive it - done

i can get this for free, i dont have 300 hundy

hmm always thought it was smaller pulley, more boost?

what do you do evil_si?, without giving away your trade secrets?!

[beeker]

you can do it 2 ways,
direct drive and make a smaller drive pulley on the actual supercharger. will need a shorter belt.


make a larger crank pulley, size depends on if you want to change the waterpump pulley, will need a smaller tensioner and longer belt.

harmonically balanced is the type of pulley, not the way it is balanced.

some guys use solid alloy pulleys, i wouldnt as engines arnt cheap. they tend to fu.k engines quickly, to much loading on the crank,

Do make different sizes ? 14psi is too big for my needs.

I have an AE86 powered by a 4agze from a AE101 (running 170hp stock), and as its used for Targa it gets allot of WOT and a general solid hiding! I would like more power, but not too much to burn that S/C out prematurely. Any recommendations for size and expected HP ?

[evil_si]

yea i can do any size.
power and the boost output depends on the condition of your engine and the supercharger.

i can do a hks size kit, will offer up to 12psi

[beeker]

yea i can do any size.
power and the boost output depends on the condition of your engine and the supercharger.

i can do a hks size kit, will offer up to 12psi

Is there a way to test them without removal ?

What kind of addional HP can you expect from a 12psi pulley ? Im current boosting to 8.5psi on stock

Can you still get good condition SC12's ? I'm starting to assume that all of them would be 100,000km ++ by now.

[evil_si]

just buy one of evil_si's, if you are unsure of the detail save yourself the time and hassle, buy it, bolt it ,drive it - done

i can get this for free, i dont have 300 hundy

hmm always thought it was smaller pulley, more boost?

what do you do evil_si?, without giving away your trade secrets?!

just remember free isnt always best. if its not done right it will cost you in the long run.

as i said earlier there is 2 ways of achieveing it.

a smaller pulley can only be on the receiving end,
i dont play with the supercharger pulley unless specifically requested, its more hassle than what its worth. direct drive is a pita.

larger pulley drives the small pulley faster.

if you have a lego set with the electric motors try it. a big drive motor will spin the wheel faster, a small drive motor will spin a wheel slower.

if you dont under stand simple drive theory's its probably best you dont change it.

[bluemaumau]

um so how do you make the standard item bigger?

[FrEsH]

you replace it

[evil_si]

Is there a way to test them without removal ?

What kind of addional HP can you expect from a 12psi pulley ? Im current boosting to 8.5psi on stock

Can you still get good condition SC12's ? I'm starting to assume that all of them would be 100,000km ++ by now.

not really, testing them involves checking the rotor clearances, the seals and bearings.

its been a while since ive had one apart, i cant remeber if they have straight or helical gears, i would imagine helical if so clearances can be changed by adding or removing shims.

to be honest i have never dynoed them so do not know the exact power increase between the pulley sizes.

i have seen a comparison on another website between the pulley sizes and boost levels, i will try and dig it out.

[KinLoud]

Early (AFM) AE92 4agze engines have a bigger pulley on the supercharger itself than the later ones.
When the MAP 4agze engines came out they had a smaller s/c pulley - so the super charger spins a bit faster than the earlier ones so they have a bit more boost.
Are you running AFM or MAP?
If MAP, don't change the s/c pulley but think about a bigger crank pulley.
However - spin the s/c faster and you get a bit more boost but lots more heat (this is because the roots type s/c isn't efficient at higher boost levels)
Spin the toyota s/c too fast and the teflon coating melts/wears off and you will lose boost!

Ken
Hamilton
021 408 863

[beeker]

Early (AFM) AE92 4agze engines have a bigger pulley on the supercharger itself than the later ones.
When the MAP 4agze engines came out they had a smaller s/c pulley - so the super charger spins a bit faster than the earlier ones so they have a bit more boost.
Are you running AFM or MAP?
If MAP, don't change the s/c pulley but think about a bigger crank pulley.
However - spin the s/c faster and you get a bit more boost but lots more heat (this is because the roots type s/c isn't efficient at higher boost levels)
Spin the toyota s/c too fast and the teflon coating melts/wears off and you will lose boost!

Ken
Hamilton
021 408 863

I believe the AE101 is map, Stock 170hp. So the question is, what is the recommended sustainable boost (and thus pulley size, crank pulley if thats whats recommended) for a high WOT application?

I've made the assumption that 14psi is too high, and that maybe a 10 or 12psi would be ok. Pure guess work. I would like to know what additional HP a 10 or 12psi pulley would give me though.

[bluemaumau]

ive got the afm, so you reckon fitting a ae101 s/c pulley is the way to go?

[Crucible]

I've made the assumption that 14psi is too high, and that maybe a 10 or 12psi would be ok. Pure guess work. I would like to know what additional HP a 10 or 12psi pulley would give me though.

Ive bought two pulleys off Evil_si, a 165mm and a 175mm. I fitted the 165 kit to my Dads 101 levin and the other to my 101 Trueno. My old mans Levin produced 11-12psi and I was getting 14psi but Dads seemed to pull alot better than my car which had the bigger pulley. Everything else on both cars were identical,exhaust,Coolers etc. The only thing I could put it down to was maybe the charger was starting to become inefficient and was starting to pump hot air above 12psi. Now I know this dont mean jack unless I had both cars on a Dyno but both me and my Dad could really feel the differance between the two, it was quite noticeable. However if I had gone to the effort to fit good water to air cooler Id say it would of been alot better

[aesc]

OK, just a note that the 175mm pulley in most cases wont give 14psi, your prob gonna get 13psi max.

[Crucible]

OK, just a note that the 175mm pulley in most cases wont give 14psi, your prob gonna get 13psi max.

I got 14psi on a cold night eazy peazy (Autometer Gauge), I know of two other 101 gtzs with 14 and over all with good brand boost gauges, maybe its 14psi max with a 175mm pulley?

[CAMB01]

Im getting 13 - 15psi on my GZE with 175mm pulley
I do notice that it doesnt like high revs cause of the heat it generates.
A more efficient cooler should fix that problem.
Plus i have a MAP GZE which has the annoying 5500rpm drop.