85 Jetta engine swap
Moderator: Fatmobile
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- Turbo Charger
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- Location: Michigan
85 Jetta engine swap
I am installing a diesel engine in a gas 85 Jetta. Should I remove the fuel pump? I am just wondering if the injection pump will pull fuel past the pump. Also do I need to put a check valve between the tank and the injection pump? If so what does it look like? The transmission is a 9a13055 five speed will that be a good trans for fuel economy. ( low reving at 55 m.p.h.
Thanks
Thanks
1981 VW Diesel truck / 1984 Rabbit car welded together
I am no expert on that topic but my 93 Passat wagon with the eco diesel swap (I bought it wrecked) has the in-tank pump removed and it looks like the pickup was extended to where the pump intake was. I am having some trouble getting fuel up to the pump but I think that is due to a restriction in the line probably related to severe rear-ender. I have a low-pressure electric fuel pump helping out so it's easier to start and move around.
Anyway, I suspect you could bypass the in-tank pump and be ok. Leaving it in would be forcing some faily high pressure diesel up to the IP, probably around 30 psi or so. I don't know if it would allow any flow if unpowered and left in place.
Anyway, I suspect you could bypass the in-tank pump and be ok. Leaving it in would be forcing some faily high pressure diesel up to the IP, probably around 30 psi or so. I don't know if it would allow any flow if unpowered and left in place.
Bob
'06 Jetta TDI
'82 Rabbit 1.6NA
Honda, 99 GMC Suburban, '41 Chevy Coupe
'06 Jetta TDI
'82 Rabbit 1.6NA
Honda, 99 GMC Suburban, '41 Chevy Coupe
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- Cetane Booster
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Looking in the Bentley, the gasser seems to have an external pump. I would remove the pump and connect the fuel lines to the top of the tank at the sending unit. Big line is supply and little one is return. There is an access door under the carpet in the trunk that should make this easy. Yes I would add some check valves to keep the pump primed. They are little plastic things that look like a motorcycle inline filter. Make sure you put the cannister filter in the engine compartment. A water separator would be a good addition as well but not mandatory. As for the 5 speed, there is no contest. 5 speed all the way. I get 43-45 mpg w/ my '85 TD Jetta.
85 Jetta 1.6 TD
(2) 81 Caddy gassers
(2) 81 Caddy gassers
Jetta
According to my info your 5th gear ratio is a .89 which is on the higher end of things, so not the greatest for mileage. But your final drive is a 3.67 which is pretty good. But there are even four speed trannies out there which have overall better ratios for mileage than this five speed. For instance I have a GP which has a .71 fourth gear and a 3.89 final drive.....a pretty good setup. Not great if you live in the hills though, especially with a NA motor.
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- Turbo Charger
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Thanks for the trans info I also have the GP four speed in my Rabbit and get 45-50 M.P.G. With the five speed I talked about i will have a little more power in top gear that good because my wife will be driving the car. If it were to slugish she might not want to drive it.
Thanks
Thanks
1981 VW Diesel truck / 1984 Rabbit car welded together
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- Cetane Booster
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- Location: A Volunteer in North Carolina
Yes, I've been wanting to know this too. However, I'm probably not interested in spending $1000+ for a newer trans plus $ for the swap at this point. But, I'd like to know if there's a manual 6 speed out there that anyone's usedWhile were talking trannies, does VW have a six speed out there that would work w/ our dinosaurs
Everybody else lists their cars here - but not me.
I have too many to count
I have too many to count
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- Turbo Charger
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Their's companies out their that will make your 5 speed into a 6. Its a kit that bolts onto the end of the tranny. I did see a web site that offered the service. I think it was in the four figures. Their was a guy in Calgary that had one and he wanted 1000 for it.
99 TDI Jetta (Z1 engine code)
94 Grand Caravan
89 Dodge Gold Stream B class
http://www.antiquedollhouseofpatterns.ca/
94 Grand Caravan
89 Dodge Gold Stream B class
http://www.antiquedollhouseofpatterns.ca/
There's a company called http://www.gearvendors.com/ that makes adaptors that replaces the output housing on your transmission (or is added after the trans) and is essentially an overdrive unit, but I don't know if anyone makes anything for a transmission that essentially has two output shafts (for front wheel drive cars). I've wondered if you could take a 4 speed and make a 5 speed out of it as well.
Everybody else lists their cars here - but not me.
I have too many to count
I have too many to count
I just did this. Leave the lift pump in the tank. ( Supposed 2-5 hp ??)
The rest is a straight swap.
Unless you have a gti tranny , you will pull less revs.
( Wannabe hot rods get the diesel tranny to drop gear ratios)
Bolt it up. Use the coil lead for the fuel pump check valve and wire up a glow plug relay.
I met a guy who uses the interior light to trip the relay.
EDIT
Rubber is cheaper than gears.
The rest is a straight swap.
Unless you have a gti tranny , you will pull less revs.
( Wannabe hot rods get the diesel tranny to drop gear ratios)
Bolt it up. Use the coil lead for the fuel pump check valve and wire up a glow plug relay.
I met a guy who uses the interior light to trip the relay.
EDIT
Rubber is cheaper than gears.
86 n/a jetta , 89 td 1.6, 05 passat 2.0 tdi 07 wrx,
id love a gasser trans, heck on flat ground i shift from 1st to 3rd then strait to 5th on my close ratio trans, It screems so hard in 5th im forced to drive my honda civic on road trips as holding 85-90MPH all day long in the VW when I travel just screems the diesel to hard, Im not going to risk ridgeing my block holding my VW at redline that long so I use my VW for my local 105 mile round trip commute and my 02' civc for all commuting 500+ miles beteen Oregon, Cali and Idaho.
Good thing my company pays $0.49 a mile
42MPG city-63MPG on a slow flat roadtrip VW
35MPG city-42MPG highway civic (no joke) and unleaded is cheaper. It really does get 42MPG, prob the 0w20 moteroil and rock sold tires
Good thing my company pays $0.49 a mile
42MPG city-63MPG on a slow flat roadtrip VW
35MPG city-42MPG highway civic (no joke) and unleaded is cheaper. It really does get 42MPG, prob the 0w20 moteroil and rock sold tires
90' Toyota X cab 4x4
02' Honda civic
85' VW Golf Diesel Project
95' dodge 12v cummins
13' VW Passat TDI DSG
02' Honda civic
85' VW Golf Diesel Project
95' dodge 12v cummins
13' VW Passat TDI DSG
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- Turbo Charger
- Posts: 315
- Joined: Sun Oct 30, 2005 7:12 pm
- Location: Michigan
If the car had fuel injection, typically the fuel pressures to run the fuel injection system are much higher than what you would need to push the fuel to the front of the car. Hopefully someone who has done this conversion will chime in on this one.
Everybody else lists their cars here - but not me.
I have too many to count
I have too many to count
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- Global Moderator
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Do you have a pressure gauge on your fuel line?
My '91 Golf turbo diesel was a gasser and I've been thinking about putting the tank pump back in... along with a boost gauge on the fuel line so I could read positive pressure along with vacuum.
My '91 Golf turbo diesel was a gasser and I've been thinking about putting the tank pump back in... along with a boost gauge on the fuel line so I could read positive pressure along with vacuum.
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.