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Underbody braces, turbos and more!

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PostPosted: Fri Apr 08, 2005 9:49 pm 
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these are what i've been waiting for. i received my underdrive pulleys from adam (bigbearzuke) today.

i installed it in a matter of minutes and got rid of several pounds of overhung mass on the end of my crankshaft. i wrapped a string around the pulley train to measure for a belt and got 780 mm. the local auto parts store stocked a 760 mm and an 815 mm. the 815 is too long, the 760 is painfully short but will work if you pull the alternator all the way back and stretch the belt over the water pump pulley. when it hops onto the pulleys, the tension is just about right. i would, however, locate the 780 mm belt before starting the job of mounting the new pulley.

the new pulley looks good, lines up with the other pulleys in the train, and spins true. i really didn't notice any difference in the operation of the alternator or water pump. the engine didn't wink the charge light, no noticeable dimming of the headlights at idle, and the water temperature held where it normally had. i did notice that the engine revs quicker now. it's really sort of amazing that a couple of pounds of rotating mass can make that much difference.

overall, the precision machining of the aluminum is well executed. the ones i got are sort of pre-production models and are not anodized. the bolt holes all line up as does the keyed slot. i used my original bolts but will probably back them out and use flat washers under the bolt heads to keep from running up burrs in the aluminum around the mounting holes.

here are pics of the installation to help you visualize the difference in size.

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Last edited by t3 ragtop on Sat Apr 09, 2005 9:57 pm, edited 1 time in total.

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 Post subject: the belt part # you used
PostPosted: Sat Apr 09, 2005 11:07 am 
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looks great T3!

What was the part# of the belt you used?

And did you take a pic of stock and the underdrive side by side?

I wan't to see if I can find a belt that will work for this.

Knuckles.

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"I also love the 7500 rpm scream of a DOHC" :razz: 2X 1989 Swift GTi's a 92 and Jr's new 93 GT

Keep your eye on the boost guage!
And I love this one!
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PostPosted: Sat Apr 09, 2005 11:56 am 
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Notice any difference with the new pulley on?

Philip


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PostPosted: Sat Apr 09, 2005 4:52 pm 
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fbergski wrote:
Notice any difference with the new pulley on?

Philip




I also just got my occracing.com red pulley today :lol: :lol: :lol: thanks agian Adam. it gives a little bit more 'seat of the pants' feel and it does improve the throttle repsonse. i was also supprised by the size/weight difference.


Jesse

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PostPosted: Sat Apr 09, 2005 7:40 pm 
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any idea which length belt is required for the mk1 g10 underdrive pulley (which arrived today :) )

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 Post subject: Belt size
PostPosted: Sat Apr 09, 2005 8:49 pm 
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Kris
The stock belt for your car is a Dayco 15330 33 inches
if you can tell me how much less you need the belt in total length, you can shorten the number to fit. Ie.. 15325 32.5 inches or 15320 32 inches etc..

The later ribbed style belts are a little tougher to figure out.
stock belt on my Mk2 is 5030323 3 rib 32.3 inches not sure what the next size down would be.

Let me know what you think is the length of the belt in total circumferance and I will see what I can find to fit for part #.

Knuckles

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"I love the whine of a turbo in the mornin" 1991 Sprint Turbo
"I also love the 7500 rpm scream of a DOHC" :razz: 2X 1989 Swift GTi's a 92 and Jr's new 93 GT

Keep your eye on the boost guage!
And I love this one!
"Dale Jarrett's crew chief" "Drive it like ya STOLE IT!"
Image


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PostPosted: Sat Apr 09, 2005 11:05 pm 
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sounds like it'll be the same as the gti .. 33" to 31" for the underdrive. i also ran a 30.5" on my gti, but it was a bit too tight :P
for the gt underdrive i recommend the dayco part# 5040310

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PostPosted: Sun Apr 10, 2005 12:24 am 
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n1tr0 wrote:
i also ran a 30.5" on my gti, but it was a bit too tight :P


that explains the noisy bearings in my verts alternator!!! :-P

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 Post subject: Finding a shorter belt
PostPosted: Sun Apr 10, 2005 1:08 am 
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n1tr0 wrote:
sounds like it'll be the same as the gti .. 33" to 31" for the underdrive. i also ran a 30.5" on my gti, but it was a bit too tight :P
for the gt underdrive i recommend the dayco part# 5040310


Ok I checked all the catalogues
87-88 T3 uses a V belt 15325 there are belts shorter by half inch increments each 15320,15315,15310,15305,15300.
So coming up with a belt to fit a shorter application should be no problem.

The Mk2 SSGTI 1.3 DOHC has a 4 rib belt stock 5040320, there are belts shorter available 5040315,5040310, and 5040305.
The next size available after 305 is 5040295. 5040320 to 5040295 is a 2.5 inch drop.

Mk2 T3's come stock with 5030323, 3 rib belt available in smaller sizes 5030310,5030300, and 5030295 and that's it.
There is not so much a range available for us T3 guys, 5030323 to 5030295 is 2.8 inches shorter.

Mk3's with 1.3 SOHC use the same belt as the MK2 GTI, as long as there is no extra goodies like PS and AC then things get a little bigger.
With AC but no PS uses 5040325, with PS but no AC uses 5040333. and finally with AC and PS uses 5040373.

I hope this helps anyone figure out what size belt they will need with these pulleys.

Knuckles.

-- edited by n1tr0 --
bolded the belt part#'s for the 31" ones that should offer the best fit.

_________________
"I love the whine of a turbo in the mornin" 1991 Sprint Turbo
"I also love the 7500 rpm scream of a DOHC" :razz: 2X 1989 Swift GTi's a 92 and Jr's new 93 GT

Keep your eye on the boost guage!
And I love this one!
"Dale Jarrett's crew chief" "Drive it like ya STOLE IT!"
Image


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PostPosted: Mon Apr 11, 2005 11:23 pm 
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31.5" would probably be better for the mk1 t3 underdrive pulley, 30" fit, but was a little tight

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PostPosted: Wed May 04, 2005 7:43 pm 
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yes he has twin's


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PostPosted: Wed Jun 08, 2005 2:46 pm 
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Schmikel wrote:
yes he has twin's


he just recently got the mk2/3 g10 4 bolt underdrive pulleys to market and i don't think he has any plan to do them in a double belt style for the 3 bangers.

he stocks them for the g13 engines though.

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1991 Blue Geo Metro Convertible highly modified 1.0L Turbo3 5 spd. - 1991 Red Geo Metro Convertible customized with a Twincam 5 spd.

My Turbo3 Project
My Cardomain Page -Ol' Blue
My YouTube Channel
My Photo Gallery
SAAB Sonett II


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PostPosted: Sat Jul 16, 2005 11:54 pm 
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Can somebody explain to me why the bolt heads hit the inside "curve" of the pulley, not allowing you to properly torque them? I'm not to happy at the moment about it....

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PostPosted: Sun Jul 17, 2005 1:46 pm 
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HiTempguy wrote:
Can somebody explain to me why the bolt heads hit the inside "curve" of the pulley, not allowing you to properly torque them? I'm not to happy at the moment about it....


Are you using allen key bolts, 10mm bolts with no skirt/flange, or skirted/flanged (there's a little lip thing on the bolt side of the bolt HEAD)?

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PostPosted: Sun Jul 17, 2005 8:10 pm 
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Definitly the ones with the skirts, as thats what the car came with :lol:

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GeoZukiGTi wrote:
This makes me wanna hurt someone, really bad. Where's Hitempguy, he's expendable
CJDavE wrote:
You have a girlfriend? :shock:

HiTemp Inc. ....... taking over the world one Sprint Turbo and Swift GTi at a time.

Chassis Flex Motorsports


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PostPosted: Sun Jul 17, 2005 9:12 pm 
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HiTempguy wrote:
Definitly the ones with the skirts, as thats what the car came with :lol:

Use the ones with out a skirt and a lockwasher?? :?:
Ace hardware to pickup some allen key ones with lock washers?

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PostPosted: Sun Jul 17, 2005 9:53 pm 
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Well, I could do that, but its the fact that nobody mentioned this before... it seems like somebody would have mentioned by now that stock bolts will not work. There is also the fact that then you have to take the wheel, inner lower fender, and the pulley off again. A minor inconvienience, but a inconvenience nonetheless :wink:

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GeoZukiGTi wrote:
This makes me wanna hurt someone, really bad. Where's Hitempguy, he's expendable
CJDavE wrote:
You have a girlfriend? :shock:

HiTemp Inc. ....... taking over the world one Sprint Turbo and Swift GTi at a time.

Chassis Flex Motorsports


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PostPosted: Thu May 10, 2007 3:00 pm 
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Is he not making an underdrive pulley at all for the +95 metro 1.0L's?

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PostPosted: Wed Jun 27, 2007 3:04 pm 
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HiTempguy wrote:
Well, I could do that, but its the fact that nobody mentioned this before... it seems like somebody would have mentioned by now that stock bolts will not work. There is also the fact that then you have to take the wheel, inner lower fender, and the pulley off again. A minor inconvienience, but a inconvenience nonetheless :wink:


Yeah, those allen bolts suck ass. The one for my T3 came with new bolts but the GT one didn't. AND they strip out like crazy.

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