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under drive pulley's 

 

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 Post subject: under drive pulley's
Posted: Wed Dec 29, 2004 7:59 pm 
Oompa Loompa
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hey all you guys out there running underdrive pulleys....do you have any temp probs or not charging at idle etc.... are they a good investment..can you notice the extra few kw's...?
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Posted: Wed Dec 29, 2004 8:11 pm 
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I changed from vbelt to an underdrive gilmerbelt setup, and i have problems with altenator not charging below 2000 Rpm, wich is fine if im driving like i normally do,,but cruise speed, 110 sits at about 1500Rpm, so i drain bateries cruising at night,,, im sure teh serpentine underdrives are fine tho,, couldnt say if they are worth the investment, cant see it being a huge drain on power as long as you have a thermofan..

 

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Posted: Wed Dec 29, 2004 9:00 pm 
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skecth your v belt system is the same drive as your gilmer belt both are driven the same way,
he is talking about going from the 5.0 windsor drive systems to a underdrive stup which allows more power to "free" from teh engine
simalar to removing the mechanical fan on your car.

your car did not have a "overdrive setup" hence u cannot change to a underdrive setup
also your charging problems sound like u need to chaneg the size of the pulley on the alt

and the underdrive pully systems are a good evenstment as they allow the car to rev faster and smoother and make the engien feel more powerfull hehehe
i think mr landua sells them. . . .

 

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Posted: Wed Dec 29, 2004 9:38 pm 
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Quote:
also your charging problems sound like u need to chaneg the size of the pulley on the alt


An underdrive belt setup means exactly that frank,, its a larger pullyon the alternator and water pump, causeing them to rotate slower in relation to the crankshaft , and hance draw less power from the engine,,, if you a have a mechanical fan this will rotate slower and draw less energy from the engine, as will your alternator (hence charging issues) and your waterpump/aircon ect...

another way to go , if your just looking for drag times, is get a shorter belt, i can organise one for about $30,
and it reduces engine load by over twice the amount of the underdrive setup,,, :) up to half a second on 1/4 mile times. but cant be used on teh road as it only runs to the water pump so you still have cooling..

 

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Posted: Wed Dec 29, 2004 10:12 pm 
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my car goes fine with a Underdrive pulley kit on it, at start it had cooling problems, but i got the Termo's hooked up probley and a good termostat, good coolant etc, goes fine and never goes above 1/4 on the temp guage.

Thats the only problems i had with mine but all fixed with not to much money spent to do it.

and gain..., yeah i felt a very good gain in power with mine..., got a bit more km's out of a tank too.

 

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Posted: Thu Dec 30, 2004 1:53 am 
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mugen, I'm running the underdrive pulleys Shane sells on mine and have had no problems. On a stinking hot day a few weeks ago, it kept its cool in traffic nicely. The charge at idle was dropping a bit, gauge was showing about 10.5 - 11 volts but the a/c fan was on speed 8 out of 10 and the thermo fans were running on high, and I had the stereo going (sub, amp) so I'd expect that. On a cooler day it charges at idle fine. Anyway, the battery has never lost charge.
As for noticing a difference, I definately could feel an improvement, and the G Tech showed it too.

 

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Posted: Thu Dec 30, 2004 3:34 pm 
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Go the G-tech's
best tuning/comparison tool available for the money.

 

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 Post subject: Re: under drive pulley's
Posted: Thu Dec 30, 2004 7:18 pm 
Oompa Loompa
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mugen wrote:
hey all you guys out there running underdrive pulleys....do you have any temp probs or not charging at idle etc.... are they a good investment..can you notice the extra few kw's...?

thanks heaps for your input guy's..just might get a set
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Posted: Thu Dec 30, 2004 10:05 pm 
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When I had the underdrives on I had no problem with cooling either. The battery charging at idle did suffer though, but unless you are idling for a long time with big stereo etc going I don't think it will be a problem.
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Posted: Thu Dec 30, 2004 10:28 pm 
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The EF/EL series don't suffer as much as the EB/ED series do because of the different, bigger alternator. With Barry_V's "Loveboat" DC LTD and the Ford Racing underdive pullies, we tested the charging with a Fluke multimeter - it made 14.6V at 1600rpm - since the stock stall converter is around that figure anyway - so long as you are driving the car charges.
Shane

 

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Posted: Fri Dec 31, 2004 10:57 am 
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would it be a worthwhile investment to pop an EF/EL alternator onto an EB/ED V8 ? Do they fit easily?

What rating is the EF/EL V8 Alternator? The one on my EB is 95A, its an aftermarket/reco unit I beleive.

 

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Posted: Fri Dec 31, 2004 1:45 pm 
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The EF/EL alternators are 110amps so if you plan to run the full electronics and some decent audio gear it would be highly benificial. NZ fitted one on his car - pehaps best to PM him and see what is involved.
Shane

 

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Posted: Fri Dec 31, 2004 5:03 pm 
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what ampage is an au xr8 alternator would i be benefited by fitting and ef/el alternator to my au
regards from adam

 

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Posted: Sat Jan 01, 2005 10:21 am 
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I think the only thing that I could notice on mine was that it was a little more responsive on the throttle. As for power, my seatofthepants-o-meter maybe a little rusty as I couldn't tell if it improved or not. No adverse problems with it. Cooling and charging: no problems.

 

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Posted: Sat Jan 01, 2005 11:39 pm 
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wild6 wrote:
what ampage is an au xr8 alternator would i be benefited by fitting and ef/el alternator to my au
regards from adam


no benifit i think the au runs 110 amp!
i know a upgrade for the e series alts is to get a AU alt and put the insides in E series body :)

 

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