FAQ: Selecting Proper Supercharger Pulley & Belt Size (Series I)

I'll measure you one tomorrow afternoon when I get to the shop if you want...

Pulley Boyz have them, also ZZPerformance, and 3800 Performance. I got my 2.5 from ZZP. I think I will get my next 1 from Pulley boyz they have a better color variety.

Hows that SC project of ours coming Karma? I'm still wondering if I should go with the 2.3" or 2.4". If I get the meth injection, and knowing it hasn't got the teflon anymore will I be okay with the 2.3? Or u figure thats to much for the M62?

Hometown Hero wrote:

Hows that SC project of ours coming Karma? I'm still wondering if I should go with the 2.3" or 2.4". If I get the meth injection, and knowing it hasn't got the teflon anymore will I be okay with the 2.3? Or u figure thats to much for the M62?

Haven't had a chance to cut it up yet, got to get my riv back on the road in time for my sister's wedding.

Being a re-manufactured blower, with ALL new bearings, I expect physically it can handle the spinning down to 2.0", but the heat and lower efficiency at that speed would be more than you really want. Being that the re-man process had the rotors stripped, you can spay pre-blower to keep things cool, and the meth is supposed to help improve pumping efficiency too, so you you will be able to drop smaller than most would be able to normally. However, boost, even cool boost does not = HP. I'd stick with the 2.4" and the meth, until you know how much boost is actually being made with the setup.(and of course KR, every engine is different) And I think rockers should be top of your purchase list to get the air out again.

Karma wrote:

I'll measure you one tomorrow afternoon when I get to the shop if you want...

if you could, theres a guy at my work who builds race cars and says he has a 2.5 i think he tryed it on a eaton 177 and he said it made way too much boost so he'd sell it to me if it would fit

Cmurphy wrote:

Karma wrote:

I'll measure you one tomorrow afternoon when I get to the shop if you want...

if you could, theres a guy at my work who builds race cars and says he has a 2.5 i think he tryed it on a eaton 177 and he said it made way too much boost so he'd sell it to me if it would fit

Have you been told the 2.5 is too small for the Series one engine.?
Do you have way of checking KR (Knock Retard) ?

Rickw wrote:

Cmurphy wrote:

Karma wrote:

I'll measure you one tomorrow afternoon when I get to the shop if you want...

if you could, theres a guy at my work who builds race cars and says he has a 2.5 i think he tryed it on a eaton 177 and he said it made way too much boost so he'd sell it to me if it would fit

Have you been told the 2.5 is too small for the Series one engine.?
Do you have way of checking KR (Knock Retard) ?

No, i was told it was a good size as long as you monitor your car regularly and with proper mods.

Yes i do, i got a Actron CP9145, my Knock Ret reading is 0

Was wondering what gains I would get from 180 drilled thermo, autolite 104s, 3'' exhaust and a 2.5'' s/c pulley? anyone have these mods for a 95?? let me know...

Thanks - Zach

you wont see alot of top end difference. series 1 motors seem to fall on there face top end wise. you will see a gain in your low end torque. i for one cant keep the tires from spinning under 45mph.

95ParkAveUltra wrote:

you wont see alot of top end difference. series 1 motors seem to fall on there face top end wise. you will see a gain in your low end torque. i for one cant keep the tires from spinning under 45mph.

yah i kinda figured that, is it a big difference?? any effects on gas milage?

lol as far as gas milage... that all depends on your foot. i get about 19 city. i dont travel highway much so not sure on that. but ya there is a difference in the torque. but you wont notice much past 60-70. if you want to open up your top end. i suggest roller rockers. thats good for 10-15hp above 4k rpm. which is really where these motors need it.

I'd say, start with the rockers, 180*, 104's and 3" DP. (no need for a cat-back. stock is good for 12's) Those are all pretty safe mods. then if you want more later you can drop to a 2.5 you have the supporting mods to do so. do you have any way of scanning the car?

i agree with mr.riviera. i totally forgot to mention scanning. what size pulley do you have on your car now? all stock? scan with every pulley drop. i dropped from 2.85 to 2.5 and it took about 100 miles for the computer to readjust fuel trims. i spiked to 7 degrees of knock instantly. after the 100 miles i have none. but with those mods including rockers you should have no problem

Mr. Riv is right about the order, rockers are really up there to get the pulley drop to work correctly. The thermo and plugs are really supporting mods for the pulley drop and don't make power in themselves.

and Cmurphy, sorry this is late, but the shank for the m62 is .642". and its keyed.

Mr.Riviera wrote:

I'd say, start with the rockers, 180*, 104's and 3" DP. (no need for a cat-back. stock is good for 12's) Those are all pretty safe mods. then if you want more later you can drop to a 2.5 you have the supporting mods to do so. do you have any way of scanning the car?

Sorry been away for a bit, my cars been off the road for a while due to hitting a massive pot hole in my city and I fought them to pay for the damage(Finally won, 2700 bucks in damage)

I actually dont have a way of scanning the car....on that note, how do you scan a OBD1? Same way as OB2? Newb question but yah...thanks guys.

for a series 1 you have a obd 1.5 . A , Actron cp 9145 scanner will work. its a obd1 with a obd2 connector. if you have the same set up as my 95 riv s/c of course.

congrats on kicking the citys ass!

I scanned my riv and have not found any KR. I am running the stock pulley now, i am considering changing pulleys, but i'm not sure if i should go for the 2.7 or 2.6. I want to be as safe as possible, but i don't know if 2.7 will yield any gains. Any input?

With Series I, because the OEM pulley dia is small to begin with, any decrease at all is significant. If you want to be safe with no other mods, go with the 2.7". This will give a little added boost, maybe gain 10 HP. You will notice it as low end torque. This would be like dropping to a 3.6" on our Series II SC engines.

If you do the 2.6", it's a more significant gain, probably in the 20 HP range. This is when you should start thinkng about adjusting fuel delivery, either with a custom PCM tune or using a Mini AFC inline with your MAF sensor. Additional mods like 3" downpipe and/or high-lift rockers will let the added boost breath better, giving you even more gains, and lowering KR.

PS - when you scan for KR, make sure you are really testing WOT under different load conditions, like after the 2-3 shift point at WOT, and during a sudden downshift while driving. Even stock you should be able to get a blip or so when you try. This is okay, and tells you where to look for it next time you scan.

Okay i think i will buy a 2.7. I am also trying to decide weather to get the autolite 605's or the 104's? My mods are pretty low, but has anyone had problems with the 104's?

as long as you get on the gas occasionally there is very little chance you will have plug fouling with 104's.
If you dont plan on changing them often (for me the copper plugs seem to last about a year) you might want to get the iridium 104's. they will run slightly hotter than the copper 104's but last a lot longer.

So would the Iridium 104's be like the range of the copper 605's?

Hard to say exactly. And at your mod level, it's not going to make a huge difference, imo. Buy the iridium if you have the cash and are looking to get 50k+ miles out of a set of plugs. I like the using normal copper plugs because they're cheap, and changing them out once per year lets you inspect for clues on your engine's condition. I discovered my LIM gasket was leaking by identifying the residue on 2 of the back plugs.

Alright i will buy the iridium 104's along with a drop in K&N filter and a 2.7 supercharger pulley. With my 180* thermostat and these mods maybe i'll be able to add 10-15 horsepower.

I am starting to do some "soft mods" on my 57k mile Series 1.

I am considering a 2.7" pulley and I need to know if this will fit before I order...

Eaton M62 Keyed Pulley


http://www.pulleyboys.com/store/product.php?productid=39&cat=9&page=1

yep. It'll fit.

That is the same one i am going to order