What's needed to bring an ULEV motor up to the 145hp the EX motor is rated at is it more than the whole exhaust system?

 

What's the stock hp at the crank for the ULEV motors?

 

Ulev? Id say swap in a f23 for cheap.

 

the ULEV is an F23 just not an F23A1 which is what the OP is trying to create it seems.

i havn't looked into the specific differences of the two motors, but i would speculate the ECU and it's parameters, the exhaust (mainly the manifold), and the cam/VTEC. does the ULEV have VTEC..? if it does i would bet it responds differently from the F23A1.

it's not as easy as a manifold swap and a camshaft like it is on the 90-93 LX to EX. i would recommend swapping a complete EX motor

 

i just swapped a ULEV with 60,000 miles into my 98 lx because my f23a1 took a crap with 120,000 miles on it. its the same engine. same ECU, same cam gear and shaft. only thing diff is the exhaust mani

 

then make sure you use your current ecu amd manifold.

 

LX and EX models had the same engine. Whether or not the car came with the ULEV model depends on where it was sold...

ULEV = F23A4, rated at 145 hp. Sold in California and various other places in both the LX and EX models

LEV = F23A1, rated at 150 hp. Sold in the rest of the U.S. in both the LX and EX models.

The differences between the LX and EX models did not involve the powertrain, but items such as 4-wheel disc brakes, sunroof, alloy wheels, etc.

If I remember correctly, the main difference in power came from the ECU tuning, but the camshaft had very slight differences as well. But FWIW, the differences were so small that it did not warrant carrying 2 different camshafts in the parts bins at Honda dealerships. The exhaust manifold and catalytic converter were also different, and could possibly have contributed to the horsepower difference.

 

ecu
exhaust manifold
o2 sensor

going ulev f23a4 to reg. f23a1 ... not worth it

 

Buy an aftermarket manny and intake, and you'll get your 5hp+

 

ok so the LX and EX both got LEV motors but different ECUs? exhaust system the same?

 

F23A1
This engine was used in the 1998-2002 Honda Accord LX, EX, and SE, and in the Acura 2.3CL in North America.
Specifications
Bore × Stroke: 86.0 × 97.0 mm
Displacement: 2254 cc
Valve Configuration: SOHC, 16 valves, VTEC
Compression ratio: 9.3:1
Max power: 150 hp (112 kW) @ 5700 rpm
Max torque: 152 ft·lbf (205 N m) @ 4900 rpm
F23A4
This engine was used in the 1998-2002 Honda Accord ULEV models. It is substantially similar to the F23A1, but features ULEV certification with a slight reduction of power: 145 hp (110 kW) with a maximum torque of 150 ft·lbf (200 Nm). This engine has a different exhaust manifold and a 32-bit ECU which uses a wideband oxygen sensor.

 

No, the LX and EX both have the same exact setup. They were either both LEV, or both ULEV, depending on where the car was originally sold.

For example, if you live in Cali, the LX and EX both had the same ULEV motor (F23A4), power ratings, ECU... everything. Powertrain is identical. LEV motors were not even available.

Here in Houston, the LX and EX both came with the LEV motor (F23A1). ULEV motors were not available unless special ordered.

 

Yeah, both motors are the same pretty much except for the exhaust mani. The ULEV is for emission I believe.

 

ok so basically the only thing my LX doesnt have is the rear disc and sunroof?

 

Alloys, premium audio, sunroof, wood, leather option, painted side skirts, 8 way power with lumbar, support, homelink transmitter, standard security system with keyless entry including power trunk release, and standard ABS are a few key differences there are more just can't think of them all.

 

i can deal with the rest of stuff...power trunk release? thats factory?? i was going to disable my trunk latch so thieves couldnt get in my trunk as easily as just breaking a window...