Hey guys I am in the midst of converting from 5 to 6 rib. Do the LE5 and LSJ alternators have the same mounting bolt pattern? I am hoping the LE5 alternator would mount to the LSJ bracket. Then I could just pick up the MRZ pulley to convert it to 6 rib. If anyone has knowledge of this let me know. Otherwise I will need to get an LSJ alternator.

Also does the stock LE5 engine harness connectors plug into the alternator and A/C?

On a side note, if anyone has any LSJ/6 ribs parts let me know. I still need everything.

 

Sounds like your going supercharged.... If this is the case just cut off one of the ribs from your lsj belt. It will be fine. When I was supercharged I did this along with 3 other cobalts that went supercharged here in San Antonio. All vehicles are running fine and no belt issues like stress cracks or anything. If this is not what you plan on doing just disregard my post

 

He isn't just supercharged, he is fully built and trying to push the envelope and pulley down into the mid 2s, read my thread for his setup, trashed 3 belts on a 2.7 fast.

 

to do a 5 to 6 rib conversion, you would need the LSJ alternator, AC compressor, and Crank Pulley along with the stuff you already have. the LSJ alternator puts out more amps the the L61 or LE5 on does, so just swap alternators. as far as the AC compressor, and Crank pulley. I have not seen or heard of anyone going that far. If you cut the belt properly, then you should have no issues at all with it. I have been running my cut belt for about a year now, and know many many many others that have run then for years aswell. If you are shredding belts, I would look into on of you current pulleys maybe having some burrs on it or something.

Oh and as far as the alternator bolting up, i would imagine that it does. The GMPP kit for the Jbodys used the stock L61 alternator.

 

I have a 6 rib LSJ belt if you need it.great condition.

 

Quick FYI for 5 rib setup: Long story short, you can't run smaller than a 2.9" pulley without belt slip.

I am ordering a pulley from Summit Racing to convert my alternator to 6 rib.

Also it is cheaper to buy a used A/C than it is to buy a 6 rib clutch kit to convert it. Used LSJ A/C is $50 and a clutch is ~ $100, but then I need to redo the A/C system and I still don't know if the connectors are the same.

Got a crank pulley and idler from a CSS member and a tensioner from another. Just need to get the alternator bracket and figure out what to do about the A/C.

 

what belt setup is on the car now? stage 2 belt? oversized tensioner?

 

No. ZZP stage 2 setup for 5 rib(2.2l, 2.4l) That kit was intended for a 3.1" though. Even with a taut belt and dressing 5 ribs just won't grip.

Oh. NM I see you are 2.2 SC not LSJ.

I might need the Stage 2 belt.

 

i have a stage 2 belt....lol think its cut down already though.

 

oh wow..... thats some crazy stuff.

 

so your are shredding belt huh? do you have the oversized tensioner pulley? something tells me that it is NOT the number of ribs on your belt, but something else.

arent you over spinning the blower witha 2.7 anyways?

 

Ummmmmmmmmm
I don't know where you get your info,
but every alternator I see is 140 amp
no matter which engine you have.

 

I tried a custom idler to wrap the SC pulley more but it caused belt issues and still slipped anyway. It did grip ok in the lower rpms, but would let loose above 5k. So I am converting to the LSJ serpentine system to get better grip/tension.


Eh. I think anyone spinning faster than the stock pulley is over spinning. Most people stop at 2.9" on the 2.2l, 2.4ls and I want to push well beyond the 225-250whp range that everyone hits on the m62.

 

my blower saw a reliable 238 daily on the 2.9 pulley and still had lots of modding left.

 

sounds like you need a smaller belt not necessarily one with more ribs

its too bad that 90% of us are just running the LSJ stuff i'd look to ZZP for help at this point

 

I have an OEM stage 2 belt that doenst slip on a 2.8 and I spin it to 7k. You need the OEM belt from GM the ZZP one is junk.

To convert to 6 rib. The blocks are the same externally (basically), everything bolts on, the alt plugs right in (you should be able to swap them in under an hour if you have all the tools already), The AC should all bolt up and connect in, you will need to get the AC purged and recharged right away though, and make sure the compressor doesnt cycle before its been purged, the crank pulley. AVOID MRZ like the plague, and any other aluminum crank pulley for that matter. You NEED a pulley with a damper on the crank, be it ATI or OEM.

Also, fyi belt dressing is designed for old school leather V belts not our Kevlar and rubber serp belts.

 

Thanks man. I ordered a used A/C, but I am going to see if the clutches are the same and possibly swap them, otherwise will have to purge the system.

Last thing I need is the alternator bracket.

Belt dressing just made a sticky mess

 

I thought you were already on the blower, so you already have the alternator bracket.

 

I ran a 2.7 and all I got was heat soak, and worse times than I did with a 2.8. I'm very interested to see how your problem gets solved. GL

 

Using the ZZP 5 rib setup. It uses a custom belt routing with an idler and all the stock 5rib accessories.

 

Thats weird.

 

I am using the phenolic spacer and that helps a lot. The belt did grip low end and it felt really nice. I think the difference is 20whp b/t 2.9/2.7. It was very noticeable.

I have all the parts now for the LSJ setup except for the alternator bracket.

 

This is the ZZP kit routing with 5 rib and it retains all parts including the oem tensioner. So the wider LSJ belt and stiffer tensioner should infact solve my issue.

 

Just switching to the lsj setup with a 5 rib should fix ya.

 

what this guy said.....that way it is in that picture doesnt seem like the belt (even though tight) is getting enough tension...

i have the alt bracket....but the part that the engine hook goes to is snapped off....the res is still perfectly good though...pm me if you are interested....