D15B1/D15B2 ECU and Cam
#1
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D15B1/D15B2 ECU and Cam
Does anybody know the difference between the DX and STD ECU? My '91 Wagon with the D15B2 has a 37820-PM5-A30 ECU. I have an '89 STD ECU, part number 37820-PM5-A180. The wagon drives the same with either one. I'm after better MPG and wondering if the STD ECU will make a difference. I'm usually below 2000 RPM, if that matters.
Also, does anybody have lift/duration specs of the DX and STD cams?
Thanks.
Also, does anybody have lift/duration specs of the DX and STD cams?
Thanks.
#3
Honda-Tech Member
Re: D15B1/D15B2 ECU and Cam
STD ECUs are PM9, NOT PM5.
You'll see no difference anyways unless you run the STD throttle restrictor plate and manifold/cat (it was like the HF's).
You'll see no difference anyways unless you run the STD throttle restrictor plate and manifold/cat (it was like the HF's).
#4
Re: D15B1/D15B2 ECU and Cam
I have a sohc zc and I'm running the I/M and TB from my old d15b1. I just went and got a pm5 ecu to replace the pm9 that was in it and it made a nice difference. More power and way better response off the line!
#5
Honda-Tech Member
Re: D15B1/D15B2 ECU and Cam
When I had DPFI in my STD, I replaced the PM9 with the PM5 and it made the motor idle and drive smoother. The PM9 would stumble and idle a bit rough. Didn't notice any power increases though.
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Re: D15B1/D15B2 ECU and Cam
Civic
3DR
88-89 DX 5 speed
37820-PM5-F01
90-91 DX 5 speed
37821-PM5-A00
88-89 STD
37820-PM5-F21
90-91 STD
37820-PM9-A01
37820-PM9-M00
4DR
88-91
37820-PM5-F01
37820-PM5-A01
90-91
37820-PM5-M10
5DR
88-89 5 speed
37820-PM5-A08
37820-PM5-F01
90-91 5 speed
37820-PM5-A09
I didn't even get into CRX's or auto ECU's but just to clarify how many variations there are. I can only assume that car's that carried more weight (4DR/5DR) had perhaps more aggressive timing/fuel maps to compensate for the weight? Only a guess though.
3DR
88-89 DX 5 speed
37820-PM5-F01
90-91 DX 5 speed
37821-PM5-A00
88-89 STD
37820-PM5-F21
90-91 STD
37820-PM9-A01
37820-PM9-M00
4DR
88-91
37820-PM5-F01
37820-PM5-A01
90-91
37820-PM5-M10
5DR
88-89 5 speed
37820-PM5-A08
37820-PM5-F01
90-91 5 speed
37820-PM5-A09
I didn't even get into CRX's or auto ECU's but just to clarify how many variations there are. I can only assume that car's that carried more weight (4DR/5DR) had perhaps more aggressive timing/fuel maps to compensate for the weight? Only a guess though.
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