Larger throttle body for 08 SG
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
I have the SE 58 mm TB for the 08 Touring , look at the online SE parts catalog, sorry you're gonna have to work a little , for the # and be aware that without modification only 3 air cleaner units will fit , a Bob Wood , the SE Heavy Breather fits the 50 and the 58 both for 08 Touring and SE sells a 58 specific unit that is in the cat online but you cannot buy a K&N filter to fit, I am sure you could modify one to fit but I took mine off and went with the HB. Don't let the naysayers sway you, I have it on a 103 with huge heads on a Touring bike and it runs very well now, the tune will make or break your satisfaction with it. Oh and howdy neighbor, I am in Ventura Co. also.
Road Master
Joined: Aug 2008
Posts: 1,017
Likes: 2
From: New Jersey
I just had my TB modified by HPI (Horsepower inc.). they bored it out to a 54mm and siamesed a 1.800 manifold on the back of it. you can have the manifold left stock and just bore the TB to 54mm. the TB just came back today and it is a really nice looking piece. HPI does soem excellent work from what I can tell. I have an extra 08 FBW TB also, that I may be willing to sell if someone wants to minimize their downtime and have one to send out to HPI while they are still riding. Call HPI and speak to them about it.
Member
Joined: Jul 2009
Posts: 4,310
Likes: 1,079
I have the SE 58 mm TB for the 08 Touring , look at the online SE parts catalog, sorry you're gonna have to work a little , for the # and be aware that without modification only 3 air cleaner units will fit , a Bob Wood , the SE Heavy Breather fits the 50 and the 58 both for 08 Touring and SE sells a 58 specific unit that is in the cat online but you cannot buy a K&N filter to fit, I am sure you could modify one to fit but I took mine off and went with the HB. Don't let the naysayers sway you, I have it on a 103 with huge heads on a Touring bike and it runs very well now, the tune will make or break your satisfaction with it. Oh and howdy neighbor, I am in Ventura Co. also.
The HD Ventilator A/C will also fit the 58mm TB. I have both on my 2010 SE Ultra.
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
Did you do the install? I was told that the Ventilator needed modification to fit the 58 but he(the HD parts guy) may have been mistaken if you know that your Ventilator was installed unmolested.
Member
Joined: Jul 2009
Posts: 4,310
Likes: 1,079
Install was done by the dealer as a part of assembling my Hil,lside engine upgrade, however no modifications were needed to accomodate the Ventilator on the 58mm FBW Throttlebody.
Trending Topics
Road Captain
Joined: Sep 2007
Posts: 602
Likes: 51
From: central MN
What he said....
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Thread Starter
|
Intermediate
Joined: Mar 2008
Posts: 34
Likes: 0
From: Ventura Ca.
I have the SE 58 mm TB for the 08 Touring , look at the online SE parts catalog, sorry you're gonna have to work a little , for the # and be aware that without modification only 3 air cleaner units will fit , a Bob Wood , the SE Heavy Breather fits the 50 and the 58 both for 08 Touring and SE sells a 58 specific unit that is in the cat online but you cannot buy a K&N filter to fit, I am sure you could modify one to fit but I took mine off and went with the HB. Don't let the naysayers sway you, I have it on a 103 with huge heads on a Touring bike and it runs very well now, the tune will make or break your satisfaction with it. Oh and howdy neighbor, I am in Ventura Co. also.
I just got mine running with the heads, cams and exhaust last week. I was going to put one on but I got sidetracked with other projects. Well, actually my money got sidetracked.
My boat is in drydock and it seems like every day it's there the boatyard seems to find more holes to pour money into.
I'm definately going to do it in a couple of weeks.
I dynoed it today and it made 112.1 RWHP and 109.9 RWT. I'm sure that we'll see another 5 with the bigger TB.
I agree that the TB has to show a significant improvement.
The flow bench clearly shows that each individual port flows WAY more than half what the TB flows. That tells me that the TB is definately a restriction.
Also when logging vacuum (KPA) at wide open throttle it shows that the inlet tract is restrictive. That's actually the best indicator.
I'm not an expert on Harleys, but an engine is an engine. I build and tune late model Corvettes for a living and the same principles apply.
I'm actually thinking that I might build some sort of fixture so I can run my bike on my car dyno. That would be pretty cool.
Thanks for the info.
Thread
Thread Starter
Forum
Replies
Last Post
renoa18
Ignition/Tuner/ECM/Fuel Injection
5
Jul 12, 2008 08:28 PM
