Dyno results Underdrive pulleys
- Thread starter JTGrant
- Start date
They said they had to bump up the timing and also it helped had idle with the a/c running
Thats what they told me when I had it done.No timing adjustment needed. Dyno's have been from around 5-10hp and around 10lbs of tourqe if you google it and hunt for a while. I noticed a differance when I had Steeda's installed about 6 months ago. MM & FF's most recent magazine comes with a DVD on a 05 GT piece by piece install and dyno per part. They got 10hp on the dyno with BBK UDPs.
I don't think your mechanic knew what he was talking about.They said they had to bump up the timing and also it helped had idle with the a/c running
red05bullitgt
Member
Besides, U/D pulleys don't increase HP ? they free it up by slowing down your belt driven accessories such as your water pump and A/C which have nothing to do with the computer's stock tuning files... therefore no computer re-flashing is necessary.
maybe its different for f150's cause the guy is a pretty big online programer on f150online.com
A bump in idle speed is generally required to maintain alternator charging levels. Side effects of going with underdrive pulleys include:
Reduced A/C output in low speed driving
Reduced power steering assist in low speed driving
Reduced alternator charging at idle
Bumping the idle speed UP will only reduce these side-effects. I've used the Steedas on my 4.6 2V for about 20,000 miles and eventually just went back to the stock pulleys.
Reduced A/C output in low speed driving
Reduced power steering assist in low speed driving
Reduced alternator charging at idle
Bumping the idle speed UP will only reduce these side-effects. I've used the Steedas on my 4.6 2V for about 20,000 miles and eventually just went back to the stock pulleys.
Marine One
New Member
I did experience some negatives with them on a 95 Mustang GT. They caused my headlights to brown at idle and significantly contrbiuted to an overheating problem that I had when stuck in traffic. I realize that our cars are completely different than that Mustang, but can definitely see why someone would ask the question before purchasing & installing this mod.
Marine One:
You brought up an excellent point. On my 00 Vic (4.6 2V V8), the headlights did dim at idle and got worse when I had more accessories on at the time (HVAC blower, Air Conditioning, stereo, and turn signals).
I'm never going to try underdrives again in any vehicle, but that is just me. :SNSign:
You brought up an excellent point. On my 00 Vic (4.6 2V V8), the headlights did dim at idle and got worse when I had more accessories on at the time (HVAC blower, Air Conditioning, stereo, and turn signals).
I'm never going to try underdrives again in any vehicle, but that is just me. :SNSign:
