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I don't even know if it matters, I just remember someone pointing it out.
Pulley diameter dictates RPM. Changing the RPM changes the output of the alternator so I wouldn't recommend swapping pulleyes...
if I don't wouldn't that cause an over charge situation?
It is natural that the alternator for an early LS430 generates more power at lower rpm because of smaller pulley is used. That newly designed alternator's rotor has 8 poles instead of the normal 6 and the stator has 96 slots instead of the normal 36 and it has 12 rectifying diodes. These make it possible to supply 130A of current at higher rpm. It also uses segment windings and this contributes the higher output too.
It is natural that the alternator for an early LS430 generates more power at lower rpm because of smaller pulley is used. That newly designed alternator's rotor has 8 poles instead of the normal 6 and the stator has 96 slots instead of the normal 36 and it has 12 rectifying diodes. These make it possible to supply 130A of current at higher rpm. It also uses segment windings and this contributes the higher output too.
Regulator on those 430 alternators work out of the box for ls400?
It is natural that the alternator for an early LS430 generates more power at lower rpm because of smaller pulley is used. That newly designed alternator's rotor has 8 poles instead of the normal 6 and the stator has 96 slots instead of the normal 36 and it has 12 rectifying diodes. These make it possible to supply 130A of current at higher rpm. It
also uses segment windings and this contributes the higher output too.
The LS430 uses a smaller alternator pulley than LS400?
I see 61 vs 66 mm in Yamae's link but the pulley diameters for LS400 and LS430 appeared to be equal diameter when placed pulley to pulley at dealer.
In any event, the serpentine belt tensioner in the 1998 LS400.was able to accommodate any difference using standard OEM length serpentine belt.
Image from Yamae's link. Smaller alternator pulley will.generate more power at lower engine RPM's, by spinning the alternator faster
The LS430 uses a smaller alternator pulley than LS400?
I see 61 vs 66 mm in Yamae's link but the pulley diameters for LS400 and LS430 appeared to be equal diameter when placed pulley to pulley at dealer.
In any event, the serpentine belt tensioner in the 1998 LS400.was able to accommodate any difference using standard OEM length serpentine belt.
Image from Yamae's link. Smaller alternator pulley will.generate more power at lower engine RPM's, by spinning the alternator faster
YODAONE, Use a ruler and actually measure the diameter. I'm very sorry to say but your posts often lack the data and not always authentic enough. People would appreciate more if you were to add actual measurement results with figures.
According to a Denso engineer, Toyota has requested Denso more current to generate when UCF30/31 Celsiors were at the design stage due to the reason of increased power consumption. The new SC alternator was capable to supply 130A+ at the peak but at the lower rpm, it was almost the same with older ones. To supply enough current, they had to select the smaller pulley. But smaller pulley means higher rpm at alternator's shaft and bearings and these were needed additional study and experiments.
Regulator on those 430 alternators work out of the box for ls400?
Unfortunately the answer is No.
The best idea is to use an original Denso's new alternator. The next comes the Denso alternator rebuilt by Denso. I don't recommend others at all.
Unfortunately the answer is No.
The best idea is to use an original Denso's new alternator. The next comes the Denso alternator rebuilt by Denso. I don't recommend others at all.
The original LS400 alternator is dated technology.
In pertinent part the wire used in the windings is round.
The LS430 alternator is a more efficient design and produces more power under the curve.
This alternator includes rectangular wire in the windings, thus is more efficient.
Aftermarket alternators mimic this design.
The integral voltage regulator on 2001-2003 LS430 works in harmony with the battery as it does on the LS400.
The difference being the 2001-2003 LS430 alternator is capable of producing more power at lower RPM.(under the curve)
Installed an LS43O alternator on a 1998 LS400 about two years ago and no issues.
The goal here was to go with an OEM upgrade.
If anyone else has done so, please report your results.
Finally, there is a difference in rebuilt Denso alternators.
Rebuilt Densc o alternators purchased from Lexus replace everything but the housing..so a much higher standard.
Am informed this is not the case with Denso Alternators purchased aftermarket.
The original LS400 alternator is dated technology.
In pertinent part the wire used in the windings is round.
The LS430 alternator is a more efficient design and produces more power under the curve.
This alternator includes rectangular wire in the windings, thus is more efficient.
Aftermarket alternators mimic this design.
The integral voltage regulator on 2001-2003 LS430 works in harmony with the battery as it does on the LS400.
The difference being the 2001-2003 LS430 alternator is capable of producing more power at lower RPM.(under the curve)
Installed an LS43O alternator on a 1998 LS400 about two years ago and no issues.
The goal here was to go with an OEM upgrade.
If anyone else has done so, please report your results.
Finally, there is a difference in rebuilt Denso alternators.
Rebuilt Densc o alternators purchased from Lexus replace everything but the housing..so a much higher standard.
Am informed this is not the case with Denso Alternators purchased aftermarket.
You get what you pay for.
My thing is do I need to reuse the regulator from ls400 alt or would the 430 alt be plug n play?
How much electrical draw are the proposed fans needing? Are there other higher draw accessories that have been added prior? This is turning into more expenses to get this working.
The original LS400 alternator is dated technology.
In pertinent part the wire used in the windings is round.
The LS430 alternator is a more efficient design and produces more power under the curve.
This alternator includes rectangular wire in the windings, thus is more efficient.
Aftermarket alternators mimic this design.
The integral voltage regulator on 2001-2003 LS430 works in harmony with the battery as it does on the LS400.
The difference being the 2001-2003 LS430 alternator is capable of producing more power at lower RPM.(under the curve)
Installed an LS43O alternator on a 1998 LS400 about two years ago and no issues.
The goal here was to go with an OEM upgrade.
If anyone else has done so, please report your results.
Finally, there is a difference in rebuilt Denso alternators.
Rebuilt Densc o alternators purchased from Lexus replace everything but the housing..so a much higher standard.
Am informed this is not the case with Denso Alternators purchased aftermarket.
You get what you pay for.
Who informed you of this.Im looking at my Denso rebuild from an auto parts supplier and it is IMMACULATE. Anybody short of DENSO telling you this I find it most unlikely.There is NO difference in the part numbers either from Lexus or aftermarket suppliers.I also find it very hard to believe Denso is running 2 separate lines in their rebuilding operation.Finally I find it very hard to believe Denso offers a supreme rebuild just for a limited number of lexus and a lower quality rebuild for all others world wide and isnt advertising the snot out of this premium rebuild.
How much electrical draw are the proposed fans needing? Are there other higher draw accessories that have been added prior? This is turning into more expenses to get this working.
im still looking int to doing e-fans but I was stating about the ls430 alternator mod...
im still looking int to doing e-fans but I was stating about the ls430 alternator mod...
The LS430 is plug and play....
The diameter of the LS430 pulley is slightly smaller, but this is not a problem because the serpentine belt tensioner will pick up.the slack..
05-04-19, 07:43 PM
