Installed the raby under-drive pulley

[Gary H]

LOL!


Just ordered mine so fingers crossed will be able to report back in a week or so.
First one in the UK?

[Gary H]

Fitted. Fairly straightforward as my local specialist had a tool to crank off the old pulley. Start to finish, less than 2 hrs with breaks and my limited ability

First reactions? Took it down the road and on to a Motorway and planted my right foot. Initial reaction...wasn't impressed. Didn't get the 'fizzy' quick response I was expecting...but then looked at speedo: 120!! OMG!

The net result is a smoother quicker car and it's definitely noticeable, so as a bang-for-buck upgrade, I'm very pleased.

I'm concerned with noise levels because I track my car, so this, a smoother air intake tract and a custom re-flash will be all I'll be doing from a power perspective.

Get one!

[BYprodriver]

Can someone with the flat6innovations underdrive pulley tell me what belt they used??

[Steve Tinker]

If you order the pulley from Flat6, the price includes for a new belt.
The belt supplied with mine is Gates part #KO60806. Its smaller than the original and a tight fit, but being Gates its of good quality.

As an aside, I fitted the new Flat6 pulley last week and it took me about 2.5 hours from start to finish - but that's because I used a junior hacksaw (not a dremmel)& a file to remove the exposed alloy lug. Doing it a second time I could halve the hours....

As for my experience with the upgrade, definately an improvement, noticeably in the 2,000 - 4,000 rpm where I do most of my driving. The pickup improvement from the lower revs reminds me of a car thats just had its major service - a nice, clean, linear pull.

I checked the voltage at the battery terminals and the "before and after installation" voltage difference is not worth considering above 1000 rpm.
But even more suprising is that the improved cabin noise (obviously with the roof up), its much quieter, with less engine auxilliary noise coming through the bulkhead.
Coupled with the low temperature thermostat I fitted last year, both have been well spent $$$ for me - couldn't be happier

[Jake Raby]

Glad you have had a positive experience.. About the only negative experience that can be had with this install is with ALL accessories engaged and the headlights running you can see low charge capacity only at idle. As soon as the RPM comes up even 200 RPM the situation will disappear.

[backman_z]

Jake,
Can you tell us how soon the Flat6Innovations website for ording will be up. I have been thining about puting in an underdrive pulley.

Thanks, Frans

[backman_z]

Jake,
Can you tell us how soon the Flat6Innovations website for ording will be up. I have been thining about puting in an underdrive pulley.

Thanks, Frans

[Jake Raby]

It may be down for quite some time.. we are realigning alot of the retail portion of what we do and it hasn't been going very smoothly.

[Jinster]

Does anyone have measured 0-100kph numbers before and after the install?

[Kevfra]

Question - Has anyone done a before - after test of smog emissions having changed the pulley?

Thought - Isn't one of the driven accessories an air injection pump? And where that pump does the most good is at slow RPM when it helps burn fuel more completely. If you slow the pump and pour less air - it may increase your emissions. In California these things barely pass smog when they are stock.

Am I missing something here?

[Cloudsurfer]

Originally Posted by Kevfra

Question - Has anyone done a before - after test of smog emissions having changed the pulley?

Thought - Isn't one of the driven accessories an air injection pump? And where that pump does the most good is at slow RPM when it helps burn fuel more completely. If you slow the pump and pour less air - it may increase your emissions. In California these things barely pass smog when they are stock.

Am I missing something here?

No. The air pump is electrically driven.

[Cloudsurfer]

How about providing some kind of harmonic damping on an aftermarket pulley?