83 928 Euro engine swap
01-23-2010 | 05:36 PM
#16
Rennlist Member
Joined: Jan 2003
Posts: 3,369
Likes: 194
From: Honolulu and sometimes L.A.
Here is the CIS to EFI adaptor. Actually there are several sources for these.
http://www.034motorsport.com/product...ov7p3ab4cb5ql7
However, I don't think you can hook in your L jet this way. This is only if you want to build or buy an aftermarket EFI system. I am guessing that is beyond your scope.
http://www.034motorsport.com/product...ov7p3ab4cb5ql7
However, I don't think you can hook in your L jet this way. This is only if you want to build or buy an aftermarket EFI system. I am guessing that is beyond your scope.
01-24-2010 | 08:21 PM
#19
Intermediate
Joined: Jan 2010
Posts: 25
Likes: 0
From: Aurora, CO
Mike,
I'm in WA State, so no smog rules because the car is 25 years old. Was planning on pulling the air pump, cats, and putting in a 2.5" pipe as I've heard 3" is too big and you can possibly lose power.
I just wanted to get euro HP into my nice US 928. No plans on racing etc. Like most, I'd like to spend as little as possible, but want to do the job right so that it will last. I already have the complete 83 euro 928, just wasn't sure I had bought the correct year, because of the CIS vs Ljet difference.
I know Tom and Adam and watched their inplant of a CIS euro motor into a 79 CIS US 928 body and that seemed almost plug and play, yet they still had a few problems they incountered and figured out, because of parts that were broken or didn't work. They ended up with a few parts from the US motor on the Euro motor.
I'm in WA State, so no smog rules because the car is 25 years old. Was planning on pulling the air pump, cats, and putting in a 2.5" pipe as I've heard 3" is too big and you can possibly lose power.
I just wanted to get euro HP into my nice US 928. No plans on racing etc. Like most, I'd like to spend as little as possible, but want to do the job right so that it will last. I already have the complete 83 euro 928, just wasn't sure I had bought the correct year, because of the CIS vs Ljet difference.
I know Tom and Adam and watched their inplant of a CIS euro motor into a 79 CIS US 928 body and that seemed almost plug and play, yet they still had a few problems they incountered and figured out, because of parts that were broken or didn't work. They ended up with a few parts from the US motor on the Euro motor.
01-25-2010 | 12:39 AM
#20
Rennlist Member
Joined: Feb 2003
Posts: 29,956
Likes: 180
From: saratoga, ca
I chime in because Ive done this a few times. the euro motor works well with the US Ljet system. However, the only caveat would be that the intake runners have to be "electronic fuel injector type". even if it doesnt, you can still use the US (which are smaller by 1/10" inch) and extrude hone them or find some euro runners. the key things that can be used is the plennum and the throttle body. since the throttle body bolts directly on to the US Ljet "U" and with it, the Ljet AFM, it is a bolt on affair.
Dont worry about the 3" vs 2.5 vs 3.5" exhaust. I found that bolt on event, gained 10hp accross the board at all RPM.
gains, over the 83 US to a euro conversion went from 200 rwhp (with headers) to 243rwhp with just the intake and cams. (not the heads with bigger euro valves, not to mention the lower compression of the US 9.3:1 set up)
with the 5 liter and euro heads, it jumped to 290rwhp, as it did for scot with Ljet as well. I figure just the heads without the 200cc displ. bump would get 10-15hp vs the 30-35hp for both. (i.e. scot did run a full euro Ljet and got 250rwhp, but it wasnt running well. it had very retarded spark, but even best case, I wouldnt expect more than 260rwhp)
The only thing I would mention, is that with the euro throttle body mounted to the US Ljet "U", you might want to hog out the "U" a little with a dremel to port match it, which is very easy to do, especially with air tools.
mk
Dont worry about the 3" vs 2.5 vs 3.5" exhaust. I found that bolt on event, gained 10hp accross the board at all RPM.
gains, over the 83 US to a euro conversion went from 200 rwhp (with headers) to 243rwhp with just the intake and cams. (not the heads with bigger euro valves, not to mention the lower compression of the US 9.3:1 set up)
with the 5 liter and euro heads, it jumped to 290rwhp, as it did for scot with Ljet as well. I figure just the heads without the 200cc displ. bump would get 10-15hp vs the 30-35hp for both. (i.e. scot did run a full euro Ljet and got 250rwhp, but it wasnt running well. it had very retarded spark, but even best case, I wouldnt expect more than 260rwhp)
The only thing I would mention, is that with the euro throttle body mounted to the US Ljet "U", you might want to hog out the "U" a little with a dremel to port match it, which is very easy to do, especially with air tools.
mk
I have an US 83' 928 that is in great shape. Looking to swap in a 83' Euro motor.
1. Can I keep the US fuel injection and swap it to the 83' Euro? Looking to get the increased HP but keep the the fuel injection. If possible what would be needed and how much $?
2. If not possible, would the complete engine swap work?
Thanks in advance,
Steve
1. Can I keep the US fuel injection and swap it to the 83' Euro? Looking to get the increased HP but keep the the fuel injection. If possible what would be needed and how much $?
2. If not possible, would the complete engine swap work?
Thanks in advance,
Steve
01-25-2010 | 12:45 AM
#21
Rennlist Member
Joined: Feb 2003
Posts: 29,956
Likes: 180
From: saratoga, ca
you dont want to go too nuts with a conversion, but there is a MAF from Ljet AFM converson kit. (Ive heard) It basically replaces the AFM and then has a little tuning set of dials to set fuel idle , part and full throttle . It mimics the AFM voltage. the caveat there is the adapter tube to make the maf fit the "U" and then you need an air box lower portion from the euro LH . that way , the air filter assembly all fits like it should.
01-25-2010 | 01:11 AM
#22
Race Director
Joined: Sep 2004
Posts: 16,271
Likes: 75
From: Stockton, CA
you dont want to go too nuts with a conversion, but there is a MAF from Ljet AFM converson kit. (Ive heard) It basically replaces the AFM and then has a little tuning set of dials to set fuel idle , part and full throttle . It mimics the AFM voltage. the caveat there is the adapter tube to make the maf fit the "U" and then you need an air box lower portion from the euro LH . that way , the air filter assembly all fits like it should.
