GSR swapped EK won't go past 5000 rpm

[lowpez7]

I bought a 2000 Honda Civic EX a few months ago. It has a 1999 GSR swap, with a obd1 p06 ecu, it's chipped but I don't know what basemap or what. It is jumped from obd2b to obd1. It has a OBD1 dizzy, what seems like a direct vtec wiring. When I first bought it it was open header and needed a catalytic, I went cheap and bought a test pipe but never installed a O2. It only has the O2 sensor on the yonaka header. And I noticed it had major exhaust leak by the head, and misfiring issues and I tried everything to fix it, and ended up buying another gsr head, same year. The exhaust leak is gone, it still misfires here and there but not as bad. But the main issue is that whenever I step on it the car seems to hesitate and doesn't pick up, it won't do burnouts either and what really bothers me is that it won't go past 5300ish rpm. It doesn't bounce off like a Rev limiter, it just feels like the engine starts to loose power and the rpm just drop slowly. The engine isn't performing how it should and I know it because it ran faster with the other head and it would actually go to 7000 rpm. The engine is type r built with full p73 internals. I don't know if this is a wiring issue, ignition, fuel, etc. I also noticed that it had been wasting a lot more gas then it should. Which sucks because I pump 93 octane into it. Previous owner has always pumped same octane too. Really need help.

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[DANA PARRISH]

First thing I would do is check compression


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[HeX]

Im no expert in this topic but there could be so many things wrong to cause your issues, especially having a swapped engine. Are you sure the ECU and dizzy are compatible with the engine? Maybe something was wired or bypassed incorrectly while converting to OBD1.

By the way, using premium octane on an engine that takes regular is only wasting fuel and leaving deposits throughtout the entire combustion system. Switch to regular gas and if it runs better off that alone then you need a thorough fuel system cleaning.

 

[bairdandrew77]

Check compression and timing. Inspect all wires that has been modified for the swap, maybe something was done incorrectly. Try using a virgin p72 or p73 ecu.

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[mc360]

Im no expert in this topic but there could be so many things wrong to cause your issues, especially having a swapped engine. Are you sure the ECU and dizzy are compatible with the engine? Maybe something was wired or bypassed incorrectly while converting to OBD1.

By the way, using premium octane on an engine that takes regular is only wasting fuel and leaving deposits throughtout the entire combustion system. Switch to regular gas and if it runs better off that alone then you need a thorough fuel system cleaning.

I don't understand why your recommending "regular" fuel for a gsr motor, b16 b18c and b18c5 all require 91 as their "regular" fuel

I would be willing to bet your issue is from the basemap, either get the correct ecu for the motor or get it tuned on the chipped ecu

 

[HeX]

I don't understand why your recommending "regular" fuel for a gsr motor, b16 b18c and b18c5 all require 91 as their "regular" fuel

Im not familiar with those engine, so I thought they used regular gas. My mistake.

 

[mc360]

Im not familiar with those engine, so I thought they used regular gas. My mistake.

It's all good I figured it because you drive a fuel sipper, all the those motors are higher compression so require 91 (or at least my buddys em1 si required it

 

[XpL0d3r]

P06 ECU is a non-vtec ECU. You need a P28 ECU or hope that the ECU you have in there now has a kit installed similar to this:
http://www.xenocron.com/vtec-conversion-parts-obd1-p-278.html

It's chipped, but is it set up for vtec?

Sounds like you very well could have a basemap issue. But you also mentioned the car still misfires sometimes... your problem may lie somewhere in there too. Any CEL?

EDIT: also confused, you said it has a GSR swap, then later on say you have a Type-R motor.. Which is it? B18C5 block with a GSR head?

 

[HeX]

I don't understand why your recommending "regular" fuel for a gsr motor, b16 b18c and b18c5 all require 91 as their "regular" fuel

I assumed (incorrectly) that only the S2000 and certain V6 hondas used premium. Its great to learn something new everyday.

 

[mc360]

I assumed (incorrectly) that only the S2000 and certain V6 hondas used premium. Its great to learn something new everyday.

Nope, with more ignition you need higher octane, with more compression higher octane, add turbo higher octane. I'm sure the compression of the b16 alone doesn't warrant high octane but the factory tune probably had decent enough timing to require it to combat knock. Adding a turbo is effectively adding compression, if your running 10:1 compression then add turbo at 8 psi you are now running 18:1 compression at 8 psi boost