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Discussion Starter #1
recently my alternator went out on my 6m-ge 83'supra. I had the 6m-ge put in like 3 years ago though so maybe I dont' remember correctly but I think the mechanic had to use a different alternator. I read Dave R's writeup on putting a 80amp alternator into the MKII's and seeing that I have power everything plus a large stereo in mine I figured I'd go with that. I found that the 70 and 80amp alternators out of the 88 supra's mounting bolt's are basically the same so I'd guess they would fit. The 70amp alternator's pulley is the same as the alternator I have right now. 7groove, same diameter and all. The 80amp alternator however has a 5groove pulley. In Dave R's writeup he says...

In addition to the alternator, you will need a new belt since the pulleys aren't the same, and cannot be swapped due to a conflict in shaft size. I bought a Gates K050375 belt -- which translates to be a 5 rib 37.5" belt. I paid 15 dollars, but for those purists, the genuine Toyota belt will run you 20 dollars. The new belt is 2 ribs narrower than the stock 7 rib belt. This will cause no problems in everyday usage, but over time, you will pay the price of requiring new bearings in the pulleys for the water pump and the alternator (thanks to PhilD for pointing this out).
Which leads me to believe it's possible to put in BUT with what consequences? I mean what does having the 5groove pulley and belt in place of the 7groove pulley and belt do over time? It's nearly half an inch thinner in width. Can this cause other damage or expenses? What's involved and what's the expense and how often would the bearings in the pulleys of the water pump and alternator be?

I talk too much. lol.
 

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I think its 89-92 autos that have the 80 amp alt. The others are all smaller. I've ran mine now for a while with no big problems. The only thing I have is that the belt slips occasionally. I attribute that to using a cheapo Autozone belt. Tightening it doesn't seem to help it. Its a great upgrade though. If you are more adventerous you might try installing a 2nd gen Mr2 turbo alternator. I've heard they are a direct swap on 7ms if you use the old 7m pulley. Supposedly they are 100-120 amps from the factory. If they fit a 7M direct fit they should hopefully direct fit a 5/6M with the same work.
 

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In the 7m application, the belt makes contact further around the pulleys than on the 5/6m arrangement. Thus the reason the 5/6m use a 7 rib belt while the 7m can get away with the 5 rib. Hence if you use a 5 rib belt on a 5/6m, you have to tighten the belt further to prevent slippage. Even so, on really cold mornings there might still be a little slip as has been pointed out. This extra tightening causes just a little more friction on the water pump and alternator bearings. Its not a really big deal, but if the original water pump already has 100+K miles, you must figure on hastening its ultimate demise with this swap. Dont let this stop you tho cause its a worthwile upgrade.

Phil
 

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Andrew said:
Isn't a 2J Alternator supposed to work also?
Yeah, but the plug is different.
 

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Discussion Starter #6
Thanks for the replies. If it doesn't cause that much damage I may just go ahead and get the 80amp alternator.

I checked at Napa and Autozone and the 80amp alternator is $180 AFTER a core swap, which they would give me $50 credit for my old alternator. I'm not very gifted in the bank account area so I'd like to avoid that if I can, I mean if I have to I'll get the $180 one but if I can save I wil. In the Dave R's writeup he mentions www.Nix99.com. I'm not like a car person or anything so part numbers are lost on me. I checked there for an 88 supra alternator and I see...

1987 SUPRA NA 1186,3D2X 27060-63081 T58834 112 $28.00
1987 SUPRA NA 0487,3D2X 113 $28.00
1989 SUPRA NA BOSCH REMAN 48 $28.00
1987 SUPRA NA 0687,SPT 27060-43130 T42411 121 $28.00
1987 SUPRA NA 0886,3D2X, T96966 109 $28.00
1987 SUPRA NA 1086,3D2X 27060-63081 T50222 120 $28.00
1987 SUPRA NA 0387,3D2X 27060-43130 T80755 73 $28.00
1991 SUPRA NA 27060 42030 99 $52.00
1991 SUPRA NA 0691,3D2X 119 $52.00
1988 SUPRA NA 3.0IC,AC T89850 121 $60.00
1988 SUPRA NA 27060 43130 T92736 127 $60.00
1988 SUPRA NA 3.0TF,FAC T89908 72 $60.00
1988 SUPRA NA 0788,3D2X 27060-43140 T41103 95 $60.00
1987 SUPRA NA 1086,3D2X,QC 31 $75.00

... and I'm like, what the heck is this. Would any of those work or do i have to find a specific one or.. what. Also these are used so would they be realiable or would I find myself having to replace it again in a year or so. I'm lost. Any help would be much appreciated as it would possibly save me $100+.
 

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Any of those will work,and are all 70 or 80 amps.Nix's computer does not always give amperage in the notes section "a place you can't get to",but all those 27060-##### are factory part #'s you can x-reference.

Shawn
Nix 99
1-800-782-0682
mon-fri 8-5 pst
 
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