Re: Under Drive Pulleys..and the problems they cause.
 

1) Remove and measure your current belt with stock damper/pulley's.

2) Wrap a string around the damper and pulleys, leaving the tensioner in the relaxed position. Note the difference in inches between the string and your stock belt.

3) Install new pulleys, wrap string and get measurement. Subtract amount wrote down from step two and that is the new belt length you need.

Re: Under Drive Pulleys..and the problems they cause.
 

Still debating the CobraR Alt & PS pulley's...
What kinda gains will I see from them!?
You think it is worth the Cost?
How hard is install?

Re: Under Drive Pulleys..and the problems they cause.
 

You would probably see no gains at all.

Re: Under Drive Pulleys..and the problems they cause.
 

OMG, this thread is still going???

This is just people not able to make a "small" decision for themselves....and/or some people just love to argue no matter what.

BOTTOM LINE....

If your spooked, or have second thoughts about it, Don't run them!!!!
99% of the time it's only gonna net ya under 10hp anyways. I don't think 10hp is even gonna get you half a 10th in the quater.

Yes, some of us have had them on for years with no issues but, If your not as confident as some of us, JUST DON"T BUY THEM...


Sorry to be prick but how many of these threads are we gonna have over the years????? The results never change...the arguments never change.:crazy:

Re: Under Drive Pulleys..and the problems they cause.
 

I believe he's talking about the pullies, not the balancer. Accessory pullies dont have any issues that would cause concern other than the alternator not charging until the engine reaches 1800'ish RPM.

The alt and PS pullies will probably net you about 3 - 5 horsepower. For some people that can be substantial. From a cost per dollar standpoint it is right in line or better than most other mods. At a certain point in the quest for more horsepower it becomes more about many small improvements.

Re: Under Drive Pulleys..and the problems they cause.
 

So why did you both with wasting your time typing all of that? If there have been quite a few threads about this then surely anything you say has been said before. So why are you wasting your time? :confused:

Re: Under Drive Pulleys..and the problems they cause.
 

Thanks for clearing this up I was going to buy them but now forget it. 15 HP is not worth the headache.

Re: Under Drive Pulleys..and the problems they cause.
 

More like 3-6 hp.

Re: Under Drive Pulleys..and the problems they cause.
 

Mine were installed and Dynoed the same day 10hp and 12tq been on 2 yrs now BUT the rev limiter is set to 6,200 and an Auto dont miss shifts and using a cast crank !:23:

Re: Under Drive Pulleys..and the problems they cause.
 

I got 12 from from the March fluid dampener.

Re: Under Drive Pulleys..and the problems they cause.
 

Mine didn't seem to help much, didn't dyno them though.

Re: Under Drive Pulleys..and the problems they cause.
 

What spark plugs can I run with underdrive pulleys???

Re: Under Drive Pulleys..and the problems they cause.
 

off topic....

has anyone had any trouble with udp recently.... i mean that are sfi approved steeda is anyway

Re: Under Drive Pulleys..and the problems they cause.
 

I'm running the Steeda balancer, Steeda W/P pulley, Cobra R Alt. pulley, and Cobra R P/S pulley without any problems whatsoever.

Re: Under Drive Pulleys..and the problems they cause.
 

I never understood that. No offense honest, because I've always enjoyed your feedback, but how are you supposed to knwo if you have problems? There's no way to really tell. Unless you are pulling the gears and checking them out every so often.

I guess going through your old oil with a fine tooth comb upon oil changes? Never thought of that one? :23:

Re: Under Drive Pulleys..and the problems they cause.
 

You're right, of course I don't pull the oil pump every so often and check the gears on it. Let me rephrase; my pump hasn't failed since running the Steeda balancer.
I was worried that running the underdrive Steeda damper in combination with the Cobra-R alternator pulley would cause battery charging probems, but none whatsoever.
In Sean Hyland's book, he of course reccomends staying away from underdrive pulleys, but then in the back of the book he has a series of engine recipes for different horsepower levels. Every one of these recipes includes the Steeda damper....what kind of sense does that make?...lol.

Re: Under Drive Pulleys..and the problems they cause.
 

I have a March FluidDamper for sale.....

Re: Under Drive Pulleys..and the problems they cause.
 

First of all sorry for adding onto to this tread, but I haven't seen this yet. How would a lighter flywheel affect engine with UDP's and/or without them?? just curious.

Re: Under Drive Pulleys..and the problems they cause.
 

No problems here :3amin:

Re: Under Drive Pulleys..and the problems they cause.
 

:eek: alum fly what's the weight on that thing? did you notice any difference on the torque loss?

Re: Under Drive Pulleys..and the problems they cause.
 

Lighter flywheel absorbs fewer crankshaft harmonics.

Re: Under Drive Pulleys..and the problems they cause.
 

Are you sure?

Re: Under Drive Pulleys..and the problems they cause.
 

So I shouldn't get a lighter flywheel?