Building a 2270 motor with LH-Jet, A discussion thread.... Options

[boxsterfan]

First off, I am not anywhere near an expert in engine building, cam selection (how duration and lift affect the motor at idle and driving), injector flow rates, etc, etc, etc... So now that I have that out of the way, I still want to figure out the bits and parts that ***may*** make it possible to run a 2270 motor with LH-Jet. The primary reasons I am looking at this setup are because:

• L-Jet likely is not a good setup for this based upon my reading (issues with cam, idle troubles, hesitation, full power, etc...).
• I don't want to run carbs.
• I don't believe I want to tackle MegaSquirt (leaving the door open though).
• It sounds like fun/dare to be different.

1. The first question that comes to mind is will it be LH-Jet 1.0 vs LH-Jet 2.0?
From my research, LH-Jet 1.0 was pretty rare and used in the early 80's but then a switch to LH-Jet 2.0 occured. The primary difference between the two was that LH-Jet 2.0 utilized a Throttle Position Sensor (TPS) whereas LH-Jet 1.0 did not.

2. If LH-Jet 2.0 variant is the desired setup, which sub-variant would be used?
There appears to be a couple sub-variants within LH-Jet 2.0 primarily consisting of LH-Jet 2.2 and LH-Jet 2.4. It appears one of the primary differences between the two is that the LH-Jet 2.4 utilizes a "trigger flywheel" and the LH-Jet 2.2 does not. What exactly a "trigger flywheel" is I am not sure....I am guess that this is a notch or mark on the flywheel that is monitored by a sensor with the data fed back to the ECU.

3. What would the "build" sheet look like for such a setup?

Of course, this list can get complicated, but the desired build here is a street car with spirited driving. I would want excellent low-end torque, around 140-150HP on the motor and good pull all the way through the RPM range up to XXXX RPM (not sure where redline would be). Note also, the car will remain as a narrow body with 4-lug wheels.

• 2270 motor with which CAM?
• What plenum could work here?
• What intake runners would work here?
• Which fuel injectors could work here?
• Need to upgrade fuel pump?
• ECU - need to pull from Volvo/Saab from 80's
• FI Wiring Harness - need to pull from Volvo/Saab from 80's and will require customization
• Need any relay boards?
• Hot-wire MAF Sensor - need to pull from Volvo/Saab LH-Jet system
• IAC - Electronic Idle Controller - need to pull from Volvo/Saab from 80's
• O2 Sensor - need to pull from Volvo/Saab from the 80's - where to mount?
• CHTS - Utilize the existing CHTS (TS2) input into the ECU as a substitute for the coolant temp sensor (just have to figure out the proper resistance)
• Cold Start Valve - probably not needed here in the Bay, but what could be done here? Or does existing on the Type IV motor work here?

Of course, if you have already done this setup, it would be great to here from you, how the car drives, pain points, etc, etc....