Chopper turbo build
1.5 BAR
Joined: Oct 2009
Posts: 935
From: CHICAGO
first i should say this: turboing carb'd motors is unpredictable and a challenge to tune.
knowing this now i can help
you will need a fuel pump with an adjustable 1:1 boost reference rising rate fuel pressure regulator. you will need to run more fuel pressure than boost otherwise the fuel will stop flowing. a blow through design is prefered as it has more capability than a draw through design. however, draw through design is the easiest.
your carb will work for either system. you may need to build a plenum for a blow through design.
knowing this now i can help
you will need a fuel pump with an adjustable 1:1 boost reference rising rate fuel pressure regulator. you will need to run more fuel pressure than boost otherwise the fuel will stop flowing. a blow through design is prefered as it has more capability than a draw through design. however, draw through design is the easiest.
your carb will work for either system. you may need to build a plenum for a blow through design.
Thread Starter
0.0 BAR
Joined: May 2010
Posts: 33
From: Prince Edward Island
Alrighty any suggestions for the fuel pump? something affordable. Im new to turbos always wanted to do a build so I thought my chopper might be the most interesting to do. Im looking into a turbo off of a Jetta, waiting to find out what year so I can figure out whats on it for a turbo.
Thread Starter
0.0 BAR
Joined: May 2010
Posts: 33
From: Prince Edward Island
Also I was hoping to make Boost around 3000-3500 to 6000 ( bike stops pulling around 5800-5900) This should keep it driveable around town i think. Would the T25 work out for this if thats what I go with??
1.5 BAR
Joined: Oct 2009
Posts: 935
From: CHICAGO
aeromotive sells them for 180.00.. see link and scroll down the page.
Boost referenced fuel pressure regulator - Shop sales, stores & prices at TheFind.com
a jetta turbo uses a kkk turbo. audi/vw use the smae turbo on there 1.8t engines. i used that turbo on a gsxr 600 turbo build and it spooled at 6000rpm so that may be a good low end rpm turbo for your application. it will be more difficult to build your turbo system with that turbo as there is no aftermarket turbo inlet/outlet flanges or oil feed/return fittings for that turbo so you will have to make them all. a t25 is very similiar to the kkk turbo. i would go with the t25 as there are many more aftermarket parts for it. you can find flanges, gaskets, oil feed and return fittings easily.
Boost referenced fuel pressure regulator - Shop sales, stores & prices at TheFind.com
a jetta turbo uses a kkk turbo. audi/vw use the smae turbo on there 1.8t engines. i used that turbo on a gsxr 600 turbo build and it spooled at 6000rpm so that may be a good low end rpm turbo for your application. it will be more difficult to build your turbo system with that turbo as there is no aftermarket turbo inlet/outlet flanges or oil feed/return fittings for that turbo so you will have to make them all. a t25 is very similiar to the kkk turbo. i would go with the t25 as there are many more aftermarket parts for it. you can find flanges, gaskets, oil feed and return fittings easily.
And also im a little confused, am I looking for a fuel pressure regulator, or a pump??
Thread Starter
0.0 BAR
Joined: May 2010
Posts: 33
From: Prince Edward Island
Garrett T25 eclipse miata honda integra nissan turbo: eBay Motors (item 180546506442 end time Aug-19-10 22:12:19 PDT)
NICE SAAB 9000 900 9-3 GARRETT T25 TURBOCHARGER TURBO : eBay Motors (item 190432107273 end time Sep-15-10 19:51
5 PDT)
Heres a few used ones I found on ebay. What do you think is a fair price to pay for one in your opinion or would you recommend buying a new one?
NICE SAAB 9000 900 9-3 GARRETT T25 TURBOCHARGER TURBO : eBay Motors (item 190432107273 end time Sep-15-10 19:51
5 PDT)Heres a few used ones I found on ebay. What do you think is a fair price to pay for one in your opinion or would you recommend buying a new one?
1.0 BAR
Joined: Feb 2003
Posts: 461
From: Wisconsin
you'll need a fuel pump, otherwise the boost will push it back up into the tank.
You have an oil coller on that thing? cylinder temps would be my primary concern. I read somewhere that Harleys run over 700* naturally aspirated on the rear cylinder, since it gets very little air flow.
Oh, and I would try a 14B turbo, or even something smaller, like the 13 series from Mitsubishi
You have an oil coller on that thing? cylinder temps would be my primary concern. I read somewhere that Harleys run over 700* naturally aspirated on the rear cylinder, since it gets very little air flow.
Oh, and I would try a 14B turbo, or even something smaller, like the 13 series from Mitsubishi
1.5 BAR
Joined: Oct 2009
Posts: 935
From: CHICAGO
yes. you will need a fuel pump and a fuel pressure regulator that references boost 1:1(1 psi fuel pressure raise for every pound of boost). very good point josh. air cooled motors will run hotter with boost so there may be rear cylinder cooling issues or even frequent head gasket failure.
Thread Starter
0.0 BAR
Joined: May 2010
Posts: 33
From: Prince Edward Island
Yeah I do agree with the oil cooler my big bear and my dads west coast chopper both run very very hot cause of the large engines. I have to start purchasing parts for the build so maybe ill start with the oil cooler this weekend
