1jz E36 BMW frankensteining

Nightstalker1993

Known Member
Senior Member
Aug 30, 2010
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The speed control of fan, can i bypass the ECU and use an after market fan controller instead? I just noticed the car's fan only got 1 speed, HIGH at all range. LOL.

Thanks,
Ken
Not too sure how is the wiring for your fan. Like I said usually there is a fan speed controller controlled by the ecu which is completely variable, though I could be wrong. Or maybe it is like the evo fan where there is 3 wires to power the high and low speed mode. If it is the variable type, don't think you got any method of controlling the speed lol.

I will explore on FICD part. May be that will stabilize my rev even more when in traffic. I will do the pulley or diode mod first to the alternator.

My mechanic that did the swap said i should not use SPAL fans, very problematic for this kinda swap. I would like to hear the fan sound though. :banana:

Thanks,
Ken
The ficd mod will be the cheapest and easiest mod to do. I would suggest you try the ficd method first or you try to press your throttle slightly, raising the rpm to 1500rpm or so then turn on the ac and adjust your throttle until it stabilizes at 1000rpm see if the issue appears and also your voltage.

Also if what I suspect is true where the voltage drop is due to the rpm dropping due to high load placed by the alternator, downsizing the pulley will apply even more load on the engine.
 

Mitevo7

1,000 RPM
Senior Member
Jan 14, 2008
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Not too sure how is the wiring for your fan. Like I said usually there is a fan speed controller controlled by the ecu which is completely variable, though I could be wrong. Or maybe it is like the evo fan where there is 3 wires to power the high and low speed mode. If it is the variable type, don't think you got any method of controlling the speed lol.



The ficd mod will be the cheapest and easiest mod to do. I would suggest you try the ficd method first or you try to press your throttle slightly, raising the rpm to 1500rpm or so then turn on the ac and adjust your throttle until it stabilizes at 1000rpm see if the issue appears and also your voltage.

Also if what I suspect is true where the voltage drop is due to the rpm dropping due to high load placed by the alternator, downsizing the pulley will apply even more load on the engine.
Stepping on the throttle is what i have been doing when the fan comes on, to keep the voltage high. The rational behind downsizing the pulley is to allow it to spin at faster rate at low RPM to generate high electricity at low rev range, i don't see how that will add more load to engine ?

Thanks,
Ken
 

gunnerzz

2,000 RPM
Jul 3, 2014
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Melaka
Stepping on the throttle is what i have been doing when the fan comes on, to keep the voltage high. The rational behind downsizing the pulley is to allow it to spin at faster rate at low RPM to generate high electricity at low rev range, i don't see how that will add more load to engine ?

Thanks,
Ken
Its like a bicycle with gears.
The bigger gears is easier to cycle compared to smaller gears which require more force to cycle.

The bigger gears/pulley which is easier to turn but will require more engine rev to spins faster in order to produce more juice.
The smaller gears/pulley will require lesser engine rev but more engine power to spins at the same speed as the bigger pulley/gears

If i recalled the physics correctly, its inertia?
 
Last edited:

^pomen_GTR^

7,000 RPM
Senior Member
May 13, 2010
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The speed control of fan, can i bypass the ECU and use an after market fan controller instead? I just noticed the car's fan only got 1 speed, HIGH at all range. LOL.

Thanks,
Ken

check at the fan motor for the socket..how many wire going into the fan?

if 5 wire..its multi speed fan..

if just 2 wire then its single speed fan...


if just 2 wire, then probably u can look for fan speed controller (from computer fan speed controller maybe?)
 

Nightstalker1993

Known Member
Senior Member
Aug 30, 2010
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Stepping on the throttle is what i have been doing when the fan comes on, to keep the voltage high. The rational behind downsizing the pulley is to allow it to spin at faster rate at low RPM to generate high electricity at low rev range, i don't see how that will add more load to engine ?

Thanks,
Ken
If stepping on the throttle solves your problem, then installing an FICD should also solve your problem. Wired to activate when the fan kicks in.

In theory if you think like that yes it will spin at higher RPM if your engine can sustain the load, but like I said, the alternator is not a free spinning device with 0 resistance. There is resistance placed on the engine by the alternator which varies depending on electrical load. When the electrical load is high, like when your fan kicks in, the alternator resistance increases, causing your engine rpm to drop as the engine is not ready to compensate for the increase in load. If you reduce the pulley size, like Gunnerzz said, it's like trying to ride a bicycle with a higher gear. If the wheel is above the ground free spinning, yes you can spin the rear wheels faster at a higher gear with the same input RPM, but once you go on the road with actual load, on the higher gear you'd need to push alot harder to maintain that RPM.

Its like a bicycle with gears.
The bigger gears is easier to cycle compared to smaller gears which require more force to cycle.

The bigger gears/pulley which is easier to turn but will require more engine rev to spins faster in order to produce more juice.
The smaller gears/pulley will require lesser engine rev but more engine power to spins at the same speed as the bigger pulley/gears

If i recalled the physics correctly, its inertia?
Yes you got it right. It's not inertia, it's just torque multiplication and is basically the principle of how your car gearbox works as well

check at the fan motor for the socket..how many wire going into the fan?

if 5 wire..its multi speed fan..

if just 2 wire then its single speed fan...


if just 2 wire, then probably u can look for fan speed controller (from computer fan speed controller maybe?)
Siao eh, motor speed controller that can handle 50+Amps is expensive man, those computer fan speed controller also is brushless and not for brushed motors. Speed controllers for brushed and brushless motors are very different. Brushed motors are 2 wires and can be controlled with a brushless fan speed controller. Even if you can get an electronic speed controllers, what will control it? On stock cars the ECU itself controls the fan speed directly.
 

marsha1l_v6

500 RPM
Aug 1, 2013
666
130
543
Kuala Lumpur
Stepping on the throttle is what i have been doing when the fan comes on, to keep the voltage high. The rational behind downsizing the pulley is to allow it to spin at faster rate at low RPM to generate high electricity at low rev range, i don't see how that will add more load to engine ?

Thanks,
Ken
all this while im using this method, stepping on throttle during idle in traffic, voltage getting low until 12.4 v @ 800 rpm. so tekan till 1.2k ish rpm to get 13.8v..haha

alternator change once, the one come with halfcut kaput, and replace with another halfcut part, just recently found that evo3 uses 75A rated alternator. So swapped in perdana alternator 90A and solve everything. 130A RA alternator ada around 4xx...tempted to buy but not sure wiring can support that output..haha
 

vr2turbo

Beyond 20,000 RPM!
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May 11, 2010
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all this while im using this method, stepping on throttle during idle in traffic, voltage getting low until 12.4 v @ 800 rpm. so tekan till 1.2k ish rpm to get 13.8v..haha

alternator change once, the one come with halfcut kaput, and replace with another halfcut part, just recently found that evo3 uses 75A rated alternator. So swapped in perdana alternator 90A and solve everything. 130A RA alternator ada around 4xx...tempted to buy but not sure wiring can support that output..haha
My VR now on Perdana alternator too. VR change many alternators already. Halfcut was the worse, one lasted 2 weeks only, lucky he allow to change, thereafter also did not last very long. Tried many recon units already, but nowadays also like not very good......lol
 

marsha1l_v6

500 RPM
Aug 1, 2013
666
130
543
Kuala Lumpur
My VR now on Perdana alternator too. VR change many alternators already. Halfcut was the worse, one lasted 2 weeks only, lucky he allow to change, thereafter also did not last very long. Tried many recon units already, but nowadays also like not very good......lol
recond warranty not as long halfcut. iirc, halfcut 1 week or so, recond few days je..hahaha

one of the best using 4g63, parts are everywhere from proton/mitsu
 

Mitevo7

1,000 RPM
Senior Member
Jan 14, 2008
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On contrary to modify the alternator, do anyone knows whether can i fit a 2JZ alternator to 1JZ motor ? The alternator itself is 100amp so i think its enough to power up my motor.

Thanks,
Ken
 

Izso

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Mar 28, 2004
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On contrary to modify the alternator, do anyone knows whether can i fit a 2JZ alternator to 1JZ motor ? The alternator itself is 100amp so i think its enough to power up my motor.

Thanks,
Ken
Should be PNP in terms of fitment. The plug however is slightly different. Just re-wire.
 

Mitevo7

1,000 RPM
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Jan 14, 2008
1,456
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Should be PNP in terms of fitment. The plug however is slightly different. Just re-wire.
Yes that's what i gathered too, today just someone decided to reply me from chop shop, after 2 months of hunting ... Thanks, once i complete the swap i will inform here.

Latest mods, installed P9 Premium Shock Absorber at Premium Garage, i am not exhilarating, the comfort felt pretty much like stock and handling was better. I got much better control on speed and corner, last thing will be brakes.

Thanks,
Ken
 

Izso

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Wha la, there we go. As far as i know, the 1jz block is identical to 2jz, difference in head. Will check with the chop shop now.

Thanks,
Ken
Eh bro.. I edited my comment after that. It's PNP fitment. The plug however is different and will need re-wiring a bit.
 

Izso

NA NA NA NA NA
Helmet Clan
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Thread starter
Mar 28, 2004
15,389
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Yes that's what i gathered too, today just someone decided to reply me from chop shop, after 2 months of hunting ... Thanks, once i complete the swap i will inform here.

Latest mods, installed P9 Premium Shock Absorber at Premium Garage, i am not exhilarating, the comfort felt pretty much like stock and handling was better. I got much better control on speed and corner, last thing will be brakes.

Thanks,
Ken
The Premium brand is basically a slight twist in the Titans brand. The workers for Titan apparently branched out to do their own thing and "Premium" was born. So means you're probably using inverted monotube setup.. nice
 

Mitevo7

1,000 RPM
Senior Member
Jan 14, 2008
1,456
179
3,163
Eh bro.. I edited my comment after that. It's PNP fitment. The plug however is different and will need re-wiring a bit.
Yup i've noticed, i do know the wiring will have some sort of difference, i am checking with my mechanic now and ask them to hold on the pulley part.

Thanks,
Ken
 

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