Why did the 1.8 engines have L-jet? |
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Why did the 1.8 engines have L-jet? |
VaccaRabite |
May 31 2024, 08:05 AM
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#1
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En Garde! Group: Admin Posts: 13,571 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Has there ever been a reason Porsche/VW speced L-jet injection for the 1.8 engines instead of D-jet like the 1.7 and 2.0 engines used?
Usually when manufactures do this there are financial reasons for the change. Either they have the same engine on other vehicles they produce, or its just cheaper to use whatever part is being used. But Porsche didn't use the T4 motor on other cars at the time. And if it was cheaper, they would have done away with Djet on the 1.7 and 2.0. I don't think VW was using l-let at the time for the bus... but maybe? There has to be a reason that Porsche wanted Ljet on the 1.8. Zach |
technicalninja |
Jun 4 2024, 01:38 PM
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#2
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Senior Member Group: Members Posts: 1,948 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region |
All the L-jet I am familiar with is batch in the same breakdowns.
L-jet touched OBD2 and maybe was sequential, but I'd expect the sequential shift with Motronic... |
ClayPerrine |
Jun 4 2024, 01:54 PM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,876 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
All the L-jet I am familiar with is batch in the same breakdowns. L-jet touched OBD2 and maybe was sequential, but I'd expect the sequential shift with Motronic... The L-Jet fires all the injectors together at the same time, but half the pulse width of a batch or sequential injection system. VW and Porsche dropped electronic injection in favor of CIS until the 3.2 Carrera, so development of the L-Jet system was never present on any Porsche. Motronic did not go to sequential until the 964. The 911 3.2 Carrera was just a more refined L-Jet system with ignition control. L-Jet is a definite improvement over D-Jet. Adding a hot wire MAF instead of the Vane air meter was a substantial improvement. While VW and Porsche were building CIS cars, Volvo implemented the LH-Jetronic in the 80s on the turbo bricks. VW, Audi, and Porsche went down the CIS rabbit hole and it was a dead end. So they lost a lot of ground on L-Jet/Motronic. |
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