P28 or P72?
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The Comeback Kid
Joined: Mar 2003
Posts: 3,345
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From: Texas Raised
P28 or P72?
I have a GSR motor with a P72 ECU. My question is why is everyone trying to get a chipped P28 ECU? Is it because its cheaper or is it because its better? I am eventually going to boost my car using a Hondata. Should I just keep my P72 or go with a P28? I did a search and didnt find too much info on this subject. Let me know.
Registered Member
Joined: May 2003
Posts: 526
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From: Chesapeake
well. I have sort of the same question. but I think it has to do with the vtec signals and the P28 only has 1 and the P72 have 2. It's allows you to do both cams at the same time. that's my theory not sure. but I have a Gsr turbo and am using a chipped p28 ecu that has a 8500 redline and works great. vtec comes on at 5100. late
Racetracks
Joined: Nov 2002
Posts: 15,668
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From: How long is a piece of string?
Actually a P28 only has one VTEC output, because VTEC works the same on DOHC or SOHC engines, there is just an extra cam for the DOHC, etc.
The P72 has the extra output for the IAB (intake air butterfly/secondary runner control, whatever you want to call it) that the P28 doesn't have.
Put it this way. A chipped P28 will run a DOHC engine great, but a P28 doesn't have a knock sensor. A lot of people don't care about that.
Actually the only difference between the P28 (SOHC) and P30 (DOHC) ECUs is that the P30 has a small extra circuit board in it for the knock sensor. They're the exact same ECU otherwise, except for the program.
P28s have a SOHC program in them, so get a P28 chipped with a DOHC program and you're set. Easy.
The P72 has the extra output for the IAB (intake air butterfly/secondary runner control, whatever you want to call it) that the P28 doesn't have.
Put it this way. A chipped P28 will run a DOHC engine great, but a P28 doesn't have a knock sensor. A lot of people don't care about that.
Actually the only difference between the P28 (SOHC) and P30 (DOHC) ECUs is that the P30 has a small extra circuit board in it for the knock sensor. They're the exact same ECU otherwise, except for the program.
P28s have a SOHC program in them, so get a P28 chipped with a DOHC program and you're set. Easy.
Registered User
Joined: Aug 2003
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From: norfolk va
how bout this, a p28 and a p30 chipped both with skunk2 theyll be the same right, i mean hp gain wise? Basically why does everyone try to get thier hands on a p28, instead of a p30 or anything else that can be chipped just as easily
