2.2 Underdrive Pulleys installed and "dyno" results

[beandip]

So A week or so ago i bought some underdrive pulleys for my 2.2. I have read that people have noticed results and mpg gains from using these so i decided to give them a try and share my results with my fellow s10F members.

First if you dont know how to install the pulleys then go here, great help and it made the process of installing the pulleys alot easier. Thanks comics22 for a great thread.--->http://www.s10forum.com/forum/f105/h...ulleys-304284/

OK, now here are the pulleys i bought from ASP, they had them in stock and were shipped to my house 2 days after i ordered. I ended up ordering the underdrive crank and alt pulley as well since i have a demanding stereo. i wasnt able to order from their site directly so call this number to order 1-877-928-8678. tell them your truck engine, and if you have ac or not.

So now on to the pics!

They came packaged very well and i couldn't believe how small the alt pulley is.





Honestly didnt think the alt pulley could be any smaller...


alt and crank pulley


Now simply install the pulley according to the thread i posted above. it helps to have an extra set of hands to get the alt pulley off. and if you have a 5 speed then you are in luck, fully engage the emergency brake and shift to 1st gear and getting the crank pulley off is alot easier than jamming a rag into the pulley to keep it still. (i apologize how dirty it is under the engine bay)


But using the channel locks to get the alt pulley off has a downside, it can destroy your old stock belt....but who cares anyways we wont be using this anymore.



So i got the alt pulley off and here is the comparison between the overdrive ASP pulley and the stock.






And now for the crank.




after that and a getting cut up you should be done.



So the question may be, what belt should i get? well there are 2 you can get. (more info in the thread i posted above) This one was suggested by ASP but someone switched out the belts at the parts store so i ended up getting a stock belt instead of a 71.5" belt so the stock one bottomed out the tensioner.


or you can get this one, its slightly shorter but it works just fine (they didnt have the other one i posted above in stock)


with the K060703 belt installed the tensioner was in between the indicators and i was good to go.(3rd indicator notch not shown in pic)


Crank pulley installed.



then i did a quick detail under the hood.





So what about this "Dyno" you read in the thread title, well i did not have a real dyno to test this on, but i did have the next best thing.

iPhone app called dynolicious, its been shown to be very accurate as long as the vehicle weight keyed in was accurate so i got the truck weighed and came out to 3580 lb. with a 1/4 tank of gas and me in it. seems a bit heavy but i also have a heavy stereo with a false floor inside as well as 17" wheels so im sure stock would weight alot less.

here is a quick video i did of it in action. The tests were preformed by slowly taking off then once reaching 20 mph in 2nd gear flooring the throttle to 5000 RPM.



So here are some before/after tests i did.

Before.
Max Acceleration .23 G's
Peak Horsepower 71


After (test was done with it set on KPH so it graphed it differently than the one above.)

Max acceleration .26 G's
Peak Horsepower 75 HP


i did 3 tests before/after and came up with this

Before
G's: .23 .24 .22
HP: 71, 73, 71

After
G's .25, .25, .26
HP 74, 74, 75

So after 3 runs i came out to seeing a noticeable improvement as well as something you can feel. now this may not be a real dyno and people say it can be off by 5 HP and .1 seconds on the 1/4 mile but its damn close for what im using it for.

Also the program cannot record torque but the G force does tell you how hard the truck is pulling so that might as well be a torque reading but just not what we are used to seeing.

also a full run i did for the hell of it. Yes the 1/4 times are pathetic but i didnt launch it and drop the clutch, i started as if i were coming from a stop light then gunned it to get an HP reading, i wasnt going for 1/4 times.

G's .35
HP 78


Now after all this i did fill up with a fresh tank of gas and calculated 24 MPG and that 60/40 highway/city driving and using the A/C alot as well. i found out today when i filled up again that i came out to 26.4 MPG and that is using the A/C at times as well! you can definitely tell the A/C doesnt bog the truck hardly at all, in fact its hard to notice of the A/C is on or not so that in itself was worth getting the pulleys. Best $160 spent IMO.

Going up hills is a breeze as well, i go up these hills every day on my way to work and some good days the 2.2 can hold its speed at 55 and other times i slow down to 52 or even 50 mph by the time i reach the top (in 5th gear).

This hill i easily conquer now, even accelerating while going up!


Now this one is more of a challenge, with the pulleys installed i kept my speed at 55 but while going to the top it dropped down to 54 with partial throttle.

yeah..its bigger than it looks in the pics.


Well overall these pulleys were worth every penny. if you daily drive your truck and want a little more out of it then go buy yourself a set, the gains are small but noticeable when you drive. its like the truck got lighter or something and it makes keeping up in traffic with the a/c on possible and without a/c you can easily keep up. I know these gains were not incredible but its alot better than being without them.

Hope you guys enjoyed the book i posted and the results i found out. I should be able to get a more accurate MPG whenever it cools off around here where i dont have to use the a/c or roll down the window.

[What?]

Nicely done, I have the same thing and same result, more mid range-high rpm power. The UD alternator pulley is 1" diameter.


And yes, this is in the sticky

[Wrkn prgs]

My truck also gained noticable gains with a set of STS pullies. I should have installed them a long time ago.. might have to buy another set for the Sonoma!

[beandip]

Quote: Originally Posted by What?

Nicely done, I have the same thing and same result, more mid range-high rpm power. The UD alternator pulley is 1" diameter.


And yes, this is in the sticky

[702s10]

Good info...been waiting for something like this...

[Mechnix]

Entertaining read - Thanks

I have the sts pullies and they really helped.. More than the efan mod or CAI

One question though... What material are these made from?
Steel or Aluminum?

[Dozer600]

Nice job beandip!

[Deja_Vu969]

Very good write up, I actually understood what I read...and I don't know much about engines. haha

This may be in store for my '98 when I have $160 laying around.


EDIT:
I'm not sure if I remember reading about it. But does the smaller pulley size affect the power output from the Alt? With the smaller pulley I'm assuming it spools faster (?) so do you have a little more current coming out then?

[03 S10 eXtreme]

I was just about to ask that same question about the power output from the alt.

I'm likely the results, but how is the voltage now with your heavy stereo? I'm running a 1200w and a 600w with 2 compressors, I've almost always wanted to pick up a set of pullies but never did it due to all the talk about losing some voltage or something of that nature.

[beandip]

Well the crank pulley is 25% underdrive and i believe the alt overdrive pulley is 30% or something like that. actually at idle i can bump the system harder than before without the lights dimming though if i go full tilt my alt completely fails but i still need to do the big 3 as well. system is only 1000w rms though and i hardly go full tilt. if you have a high output alt and the big 3 i dont see the pulleys being a problem. it even doesnt dim the lights when you try to kill it with the clutch, like you have to get around 500 rpm before the lights dim and if you dare to go even lower it stalls. before i think around 700 rpm the headlights dim if you dont give it gas when you release the clutch so it seems it significatly bumped the alternator's charging at idle.

[Dr. Steve]

I know were talking 2.2L's here but I gotta ask!

What about the 4.3L guys over here...

Do they even make a set of pulleys for them ne more?!?

I would really like to have a set, used or new!

Very nice write up BTW!

[beandip]

Quote: Originally Posted by Dr. Steve

I know were talking 2.2L's here but I gotta ask!

What about the 4.3L guys over here...

Do they even make a set of pulleys for them ne more?!?

I would really like to have a set, used or new!

Very nice write up BTW!

Thanks, call ASP and ask if they make a set for the 4.3, im sure they do. also check summitracing.com and i think JET makes some as well. just search the 4.3 section, im sure there is lots of threads about it.

[t-scene]

awesome how much was the set shiped?

[Deja_Vu969]

Quote: Originally Posted by t-scene

awesome how much was the set shiped?

I think he said roughly 160 if I remember correctly.

[beandip]

$160 for belt and pulleys.

it was $126 i believe from ASP, i ordered on Tuesday and it came in on Thursday! super fast shipping, i guess i was close to their warehouse.

the belt was about $34 or so.

[2000s105spd]

If I only wanted more performance should I buy just a crank pulley? Or would it be worth it to buy the alt pulley as well?

[beandip]

Depends if you have a stereo or plan on getting one. the alt pulley only increases the alternator's speed so it can charge better at idle with the reduced accessory speed (crank pulley slows everything down by 25%).

if you dont have a stereo dont worry about it but it wouldnt hurt to get it (or hurt performance) either way.

[What?]

I've used without alt pulley and it's good for non-heavy electrical system(efan, stereo) If you do plan on these in the future then get the alt pulley now so you can buy the belt once instead twice.

[Mechnix]

So are the ASP pullies- Steel or Aluminum?

[beandip]

Aluminum. they were soo light i thought the package was empty when it came in . I guess they also help reducing rotational mass as well.

[Dr. Steve]

Would you happen to have a website for ASP I cannot find it ne where...

or simply a tele #

Thanks!

[beandip]

Quote: Originally Posted by Dr. Steve

Would you happen to have a website for ASP I cannot find it ne where...

or simply a tele #

Thanks!

http://www.aspracing.com/index.html


telephone number is on the 1st post at the top...

[2000s105spd]

so the 71.5" belt would be the best way to go with both pullies?

[beandip]

not sure if its the best for both pulleys, maybe...close...the stock belt still "worked" but just bottomed out the tensioner. when you decide on what you want to get ASP will write down the belt you need. just look for a piece of paper attached to your billing statement and you can always ask them when you order it as well.

71.5 or 70.5" belts will work WITH A/C if you dont have A/C then i dont know what belt you need.

[2000s105spd]

Quote: Originally Posted by beandip

not sure if its the best for both pulleys, maybe...close...the stock belt still "worked" but just bottomed out the tensioner. when you decide on what you want to get ASP will write down the belt you need. just look for a piece of paper attached to your billing statement and you can always ask them when you order it as well.

71.5 or 70.5" belts will work WITH A/C if you dont have A/C then i dont know what belt you need.

ok, sounds good. looks like i'll be ordering a set as soon as i get some more money! thanks for the help beandip.

[t-scene]

just wondering do you have a E-fan I still have the old clutch fan for now and was wondering if it would have any cooling issuses

[beandip]

I still have the mechanical fan and no overheating issues at all. even A/C + 105ºF temps outside. i do have a 180º t-stat though but even then it doesnt go over 180º.

[t-scene]

ok awesome will be ordering mine pay day!

[t-scene]

another thing wonder if Goodyear makes a gatorback to fit

[beandip]

I read somewhere on the forum that goodyear belts are not recommended for ASP pulleys. dont know why it would make a difference but this Gates belt works just fine.

[tg900]

crank pulley is alum, alt pulley is steel. You can tell the steel pulley is cast then painted black. They both weigh like the same amount.

I didn't opt to buy a belt from ASP since i figured i'd do all my guesswork at the parts store and i ended up using a 70.5 inch belt which kept exactly the same amount of tension. I made a mark across the tensioner with the stock belt and pulleys, then I started at a 72'' belt then kept going down. It took me like ten trips to get the right one.

Also, i'd like to mention that with the old crank pulley, i saw the tensioner hop from time to time. With the alum machined pulley, the tensioner no longer hops...runs really smooth.

[Wrkn prgs]

Figured I'd post some MPG results..

The last few truck shows I've been to, my S-10 was averaging 24 MPG. I installed a set of STS pullies, changed the tranny filter, and oil, and this weekend I drove about 12 hours total. My first stop for fuel, I ran 338 miles on 11.5 gallons of gas, which equals about 29 MPG - that was mixed highway and backwoods hill driving.

[tg900]

i've noticed that i can't help but take advantage of the unleashed power of the pulleys. my gas mileage is the same in the city, but on the highway i gained maybe a mile. i'm used to always giving like a third throttle, so i still continue to always drive that way. I still always wonder if it's my driving or the pulleys that make me seem like i'm still getting the same gas mileage.

I will say that from a stop sign to a speed limit sign i used to get to 45mph. now i get to just below 60...like 59....so i'm gonna guess i've already gotten used to the effect of the pulleys

[Dr. Steve]

very cool Tom...very cool indeed...

Now me needs some 4.3 pulley's!

[tg900]

Hmm if I had a 4.3 i'd tell you where to get them! Did you check out summit or jegs or something?

[Dr. Steve]

yes....no go

[comics22]

yea i didnt think about putting it in gear, i think later on the pulley just started slippin on the belt so the pulley would spin but not the belt. i do like your write up tho. i think ive gouged myself countless times on the efan studs...

[98QueS-10s]

i wish i had the money for these any one want to donate for testing purposes lol

[What?]

I also use ASP pullies, very happy with result. With clutch fan, no cooling issues(180* tstat) but used with a/c and no a/c.

With efan, more noticeable power back and cooling remains same.

Mid-High rpm is where power is noticeable, don't need to floor the pedal to get up ramp. Better mpg in city and highway.

If you look in sticky, you'll see thread of performance/boost member/dynos for this stats below.

Pullies $120 - 7 rwhp
Intake $40-$200 - 2 rwhp

Is it worth the $120+belt? I say yes. If you want little extra power, bit better mpg(avg of 1, 2 mpg).

[tg900]

Power tools are nice.... Makes those bolts come off easier without moving the engine one bit

[98layinframe]

so what about a non AC truck that allready has an electric fan.. the only other pulley your turning slower is the power steering right? I wonder if it would really make much of a difference at all or not.

[tg900]

It should since it's less rotational weight. I've only done pulleys and not an Efan yet since I couldn't get the clutch fan off.

[Dr. Steve]

why wouldn't it come off???

[vivalahammer]

nice write up. i'm definitely gonna look more into these pulley's

[comics22]

Quote: Originally Posted by 98layinframe

so what about a non AC truck that allready has an electric fan.. the only other pulley your turning slower is the power steering right? I wonder if it would really make much of a difference at all or not.

power steering and water pump but not a big deal, you can lift more than 20 lbs prolly wont notice the slightly stiffer wheel turning

[98layinframe]

Quote: Originally Posted by comics22

power steering and water pump but not a big deal, you can lift more than 20 lbs prolly wont notice the slightly stiffer wheel turning

true, but i was more referring to whether or not it would even be worth the money to buy a set of these pulleys since the motor would only be turning those 2 pulleys any differently in speed. Gaining ~7hp would be worth 120 bucks, gaining 1hp is not.

[Mechnix]

It's worth it... I have a efan and hardly ever use my AC and it makes all the difference needed to make my truck enjoyable to drive and quite able to get up to highway speeds quickly, where before it wasn't up to the task.

[beandip]

Quote: Originally Posted by 98layinframe

true, but i was more referring to whether or not it would even be worth the money to buy a set of these pulleys since the motor would only be turning those 2 pulleys any differently in speed. Gaining ~7hp would be worth 120 bucks, gaining 1hp is not.

yeah if you have a/c it helps alot in that dept. if no a/c well it still helps out but i see your point.

[comics22]

well its not only smaller diameter its alot lighter, thus less force to spin it up to speed allowing more force given a set ammount of gas pedal to go to the wheels.

[Mechnix]

These are my STS pullies vs Stock
Stock alt pulley:234Gr
Stock crank pulley:797Gr

STS billet alt pulley:142Gr
STS billet crank pulley:292Gr

That's over a pound of weight off the crank alone.

Makes me want to get a lightened flywheel