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JDM h22 Type-S swap. Bad gas mileage.

 
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Old 06-12-2017, 02:30 PM
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JDM h22 Type-S swap. Bad gas mileage.

I had a engine swap done my 98 Honda Prelude with a jdm h22 type-s. I got it back a few weeks ago and so far so good, except for my mpg is horrible. I am pretty sure it is the ecu and my mechanic agrees. Originally we were going to use the usdm ecu with the swap but he kept getting misfire codes. He installed the jdm ecu and the problem went away. I am assuming the gas mileage is bad because the jdm ecu doesn't communicate with o2 sensors? Do most people who get jdm swaps go with jdm or usdm ecu? I am wondering if I should attempt to swap to usdm ecu and try to fix the misfire codes (which apparently might have something to do with the cps which would be 450 labor to get to oil pump. is there another way to fix that?) or just getting it tuned with the jdm ecu?
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Old 06-12-2017, 03:47 PM
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Re: JDM h22 Type-S swap. Bad gas mileage.

You cannot get tune since its Sh and you end up losing your Atts in that progress and it wont run properly with usdm ecu since its type s engine (different cams and so on)

What did you change in your swap (dizzy, oil pump and those things)?

If you use JDM ecu you need JDM dizzy with the CKP/TDC sensors

Did you any maintenance/rebuild or just slapped the engine there (you should do some rebuild always when you get spare part engine)?

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quick what to do list

usually these things fix bad idle or/and hesitations:

- new spark plugs & wires
- new distributor cap & rotor
- new air/fuel filters
- clean injectors/iacv/egr/fitv
- bleed the coolant
- new pcv
- adjust valves and ignition
- adjust idle from tb's screw and throttle cable
- check does sensors work properly: map, iat and tps (and try calibrating tps)
- then check wires, connectors and hoses

check o2 sensors and vacuum/exhaust leaks (check all the seals - IM/header/TB gaskets, injector seals, maybe even buy valve cover gasket set...)
check timing. after that: double check timing

clogged cat might you give some trouble as well (usually when driving) - check cats condition

those are basic maintenance as well.

+ new clutch, timing components, seals & gaskets...
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Old 06-12-2017, 05:52 PM
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Re: JDM h22 Type-S swap. Bad gas mileage.

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You cannot get tune since its Sh and you end up losing your Atts in that progress and it wont run properly with usdm ecu since its type s engine (different cams and so on)

What did you change in your swap (dizzy, oil pump and those things)?

If you use JDM ecu you need JDM dizzy with the CKP/TDC sensors

Did you any maintenance/rebuild or just slapped the engine there (you should do some rebuild always when you get spare part engine)?




+ new clutch, timing components, seals & gaskets...

What do you mean it can't be tuned? I think I meant to put type sh. What is the difference between type-s and type-sh?

Yeah, jdm dist. not sure about the oil pump. I had a mechanic do the swap. and I'm pretty sure he did all those things listed. He went through hell trying to figure out a misfire code with the usdm ecu which using the jdm ecu fixed.
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Old 06-12-2017, 08:13 PM
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Re: JDM h22 Type-S swap. Bad gas mileage.

Type S and Type SH both use ATTS. If you mess with the ECU, you lose ATTS functionality.
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1997 Prelude base [wrecked]
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Old 06-12-2017, 08:20 PM
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Re: JDM h22 Type-S swap. Bad gas mileage.

Phew, you scared me. My atts doesn't work anyways.
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Old 06-13-2017, 12:35 AM
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Re: JDM h22 Type-S swap. Bad gas mileage.

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What is the difference between type-s and type-sh?
throttle body, intake, head design, cams, pistons, whole exhaust, ecu

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He went through hell trying to figure out a misfire code with the usdm ecu which using the jdm ecu fixed.
eh, sounds like he had not much a clue what he was doing if he tried to mix jdm and usdm parts there

theres certain way how you can get these swaps done - normal mechanics dont know those tricks so its up to you to find that info and tell them what to do.

theyre not interested about figuring those things out by themselves because its not their car and research takes time
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Old 06-13-2017, 07:01 AM
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Re: JDM h22 Type-S swap. Bad gas mileage.

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throttle body, intake, head design, cams, pistons, whole exhaust, ecu



eh, sounds like he had not much a clue what he was doing if he tried to mix jdm and usdm parts there

theres certain way how you can get these swaps done - normal mechanics dont know those tricks so its up to you to find that info and tell them what to do.

theyre not interested about figuring those things out by themselves because its not their car and research takes time
Tell me what I should do? He isn't some just mechanic. I knew better to avoid that. He does jdm swaps all the time. We think the oil pump is the culprit. Would you agree?
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Old 06-13-2017, 08:25 AM
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Re: JDM h22 Type-S swap. Bad gas mileage.

Im not swap expert at all but you should do some research there how other people got that swap working

usually JDM vs USDM electrics dont match so the problem is there so you need to get correct combination of parts.

you didnt answer which parts youre using from your old engine and what is there now from JDM engine + did you any rebuilding when you got the JDM engine there?
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Old 06-13-2017, 10:09 AM
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Re: JDM h22 Type-S swap. Bad gas mileage.

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Originally Posted by TypeT View Post
Im not swap expert at all but you should do some research there how other people got that swap working

usually JDM vs USDM electrics dont match so the problem is there so you need to get correct combination of parts.

you didnt answer which parts youre using from your old engine and what is there now from JDM engine + did you any rebuilding when you got the JDM engine there?
I'll ask him. So, correct me if I'm wrong. If you're using jdm ecu, then EVERYTHING needs to be jdm?
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Old 06-13-2017, 11:44 AM
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Re: JDM h22 Type-S swap. Bad gas mileage.

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I'll ask him. So, correct me if I'm wrong. If you're using jdm ecu, then EVERYTHING needs to be jdm?
for my understanding yes, but then again I dont know all differences between USDM ja JDM electrics there (when your car harness is USDM)

for example - there might be some differences in injector voltage/fuses or something (if I remember correctly)

SiR S-spec engine would have been a lot easier than Type S
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