MP6

Will this pulley set:

http://www.summitracing.com/parts/JET-90109/

cause problems for me if im running a mezirere elec water pump? i ask because i see the set comes with an alternator pulley and was thinking it might drain my battery if it causes the amps to go down. maybe im wrong. any info is appreciated.

thanks!

Orr89rocz

IF you underdrive the crank pulley, you MUST overdrive the alternator pulley to keep voltage at the battery. The alternator pulley should be smaller than the stock one you have now. If its not, the battery could drain. It's happened to me when I ran underdrive crank pulley only and left stock alternator pulley on. I had to go to a smaller pulley to get my volts back up.

Now i'm not sure what accessories you have on the car with that electric pump. How is your serpentine belt setup currently with the electric water pump?

MP6

just the belt path is the same as stock because its a 92 lt1 so the h2o pump is the gear driven. my only mods so far are the elec pump and msd opti. soon to be the underdrive pulley depending what people say on here.

thanks!

Orr89rocz

In that case, just get the pulley kit with both crank and smaller alternator pulley. It should gain power (although small gains) and definately increase throttle response. Lighter rotating mass helps rev quicker so it will feel more responsive.

BADDUCK

I would recommend you find an aluminum set. Mass is reduced for even better results. Price is a bit more.

MP6

what kits are out there? its for a 92 lt1 and i can only find that jet pulley set.

MP6

also will the new crank pully come balanced or with a new harmonic balancer?

thanks

Jonnymac

I'm using the jet kit with a E-pump no problems and you don't need worry about the balance. Also the jet pulleys are lighter then stock.

Orr89rocz

I used the March power and amp pulleys that were aluminum crank and steel alternator. Much lighter than the stock pulley. You could use similar if the balancer has similar bolt pattern, just have to measure the belt to get proper length.

MP6

can i use the stock belt or will i need a different size?

thanks!

92C4M6

Need to bring this back from the dead. Anyone know what the p/n is for the belt required for the 92 jet under drive set?

C4in mesa

For anyone who reads this with a L98 C4 I also have the JET pulley set. Water pump, crank, and alternator and my battery doesn't drain. I have noticed at times and this is once in a blue moon my lights will dim or I will have some bizarre electrical issue but it is only for a couple minutes. Like I said once in a blue moon. I keep an eye on my voltage meter and it stays around 11.9 to 14. I bought the kit brand new off Ebay for $35. I was under the assumption that my belt was going to be a different size but it is the same and that really threw me through a loop. I compared the pulleys to the stock when the motor was on the engine stand and they are slightly smaller. I ran to Autozone twice buying different sizes when the suggestion came Hey try the stock size belt.

Jonnymac

Gates K060645

92C4M6

Just to be clear so this will be the belt I will replace my stock one with if I purchase the Jet 90109 underdrive lot for my 92?

Jonnymac

It will tell you in the instructions what size to get.

92C4M6

Oh Okay, hopefully being double sided it won't be super hard to find.

92C4M6

Jonny I called jet the first of all said my 92 wasn't an lt1 haha and they at first said the jet 90109 wouldn't work for my car then said it would. My question is thevpsrt number they gave me is k060905 which is different than what you posted. Where did u get your info from?

Jonnymac

Thats the belt I'm using on my 95 I didn't know they pulley set up was different on your 92 "non LT1" LT1.

92C4M6

92 has double sided ribs I thought they were they only lt1 year like that.

92C4M6

Did any resolution come from this?