I posted this in the Integra forum, but its a general engine question as well:

I'm swapping a JDM B18C1 into my '98 GS-R. Right now I'm running an AEM pems and a turbocharger. The engine going in is going to be N/A and it is a serious, serious pain in the ass to get the computer remapped, where I live. I'd have to tow to car 300 miles to Houston, drop it off during the weekend, then drive up there to pick it back up, and the shop there wants $500 "to start off" plus any extra time it'll take if anything's bad.
What I'd like to do is use my USDM ecu with the stock injectors, and bump up the fuel pressure to around 55-65psi to make up for the increase in compression with the JDM engine (10.6:1 vs. 10.1:1). This won't be a permanent thing, because I'm moving to california (and driving the car there, hopefully) in a month, and there's plenty of shops in close proximity to my house that can reprogram the AEM computer then. Will this work, and is there any advice on what a specific fuel pressure I should look at would be?

 

You might not have to do anything at all. You might be able to just cruise around with a stock ecu on pump gas. I am. I have a head that's milled down 20 thousandths, and flat bottomed valves on my b16. Makes for compression in the high 10's. I'm just running 91, and I don't really have any problems, on a stock ecu.

 

Thanks for the post!

 

I think you'll be fine. You could bump your fuel pressure to 46psi. I still think you'll be fine on the stock ecu. If you hear pinging just retard your timing a couple of degrees till you get to cali.

 

im running a 10.6 engine with a usdm ecu without issues.
and what shop in houston is that?

 

Carboy. They do great work, but they're extremely pushy on selling stuff. Even if I got out of there with $500 on the remap, I'd end up with at least $250 in "must-have" accessories. A $1000 rebuild I had them do for me (tear down the engine and rebuild it back to check out some weird sounds I have coming from the block) turned into $5000 almost overnight.
I've got my stock ecm and map sensor back in now, and except for the stupid CEL when I hit positive pressure, its running fine. After checking some stuff out, I don't expect there to be tooo much trouble with the new engine and add-ons.