I have a 2000 civic si (em1) and I'm putting in a built b20 vtec swap into it. I'm just wondering if I can use my stock b16 ecu with the b20v?
these are the parts:
B20B/B16a2
Port and polish head
BC stage 3 cams
Evs dual valve springs
Ferrea flat face Valves
Peak cam gears
Golden eagle billet main girdle
ARP head studs
Golden eagle block guard
Je 11:5 Pistons and rods
Level 3 Axles
B16 tranny non-lsd
B16 IM ported
Golden eagle fuel rail
70mm throttle body
Rmf header
Hasport mounts

im just really wondering if it would be safe to just run the stock ecu from my si for a built b20 vtec. Any recomondations on what should i do?
thanks in advance!

 

Can you? Yes. Should you? No

You may be able to get the car to start with the stock ecu, but honestly it won't run very well and wouldn't be that safe for the engine, your best bet is to pick up a P28 or equivalent ecu that is ready to accept Hondata, Chrome, Neptune, etc... (pick your software/hardware of choice, I personally use Hondata s300 v1) Then get the appropriate adapter harness for the ecu to work in your car and take it to get a proper tune from someone/shop who knows what they are doing.

 

so it should be best to go with hondata? My car I obd2. Would it be safe if I just get a obd2 to obd1 jumper harness to run the hondata with the same engine harness?

 

Hondata is one of the more commonly used tuning options, especially where I live. I have a 1999 EM1 I am using a OBD2B (car) to OBD1 (ecu) adapter, stock engine harness is being used and the adapter makes it plug and play. Keep in mind that Hondata (or other software) isn't just going to plug into your car and be ready to go. You will need some form of a base map to be able to get it to the tuner in order to properly tune the set up or tow it to the tuner and have them do everything.

Personally I don't have any experience with other tuning options other than Hondata. I would do some research and see what tuning option works best for your goals and budget and I would also find out what kind of tuners are in your area and what they prefer to tune with.

 

ohh okay so I can run the same harness. Just need the jumper harness so I can put the hondata in.
Honestly thank you so much! I was just so lost and scared to blow a motor I just put in. I didn't want to be losing any money.
Thanks for the help again!

 

Just do some research and see what tuning software works best for you and make sure you find someone who can and knows how to properly tune with that software and you are pretty much good to go. Plenty of info on this forum on tuning options, etc...

There are also other people here with more knowledge than me on this, hopefully they can step in as well and give you more info/opinions on the subject.

 

yea I looked up and its best to just use the type r base map for now. It would be the safest option since I don't know how to tune.

 

When you get it tuned, hopefully on a dyno, I'd be interested to see the numbers since it's pretty close to my end goal other than compression. I will stay in the 10 range to be safe since all I can get within 45 miles of home is 91.

 

will do hopefully some good numbers out of it. Well I live in Guam and we only have one dyno here. So I don't really drive long distances.
Thanks tho!

 

crazy how 2 people so far away can have similar build plans, I don't drive far either, honestly anot ex probably would have been a better car for me than an Si but more power is always nice

 

Get S300 and have it tuned by one of the several E-Tuning companies out there. Xenocron actually just began doing this for an extremely reasonable price. Do not risk destroying your investment.

Xenocron

 

Nice build. I am going with the neptune software with my tune on my motor i am building. Mines is somewhat similar to yours. I have a stock block b20b w/ 11.5 cr 96 itr with pro1 cams etc. But definitely get it dyno tuned.

 

I highly, highly agree with this. Definitely do this, don't ruin a few thousand dollars worth of work by skimping on the last, and most important bit. Plus you'll enjoy the car a lot more with a proper tune on it.

I wouldn't really use the OEM Type-R map for anything other than starting the car and idling it to check for leaks and things on the initial startup. With those cams and higher compression pistons it definitely wouldn't be running right.

Also, a tune with your mods could easily net another 40+whp after taking advantage of them.

 

Thank you guys for all the advice! And yea I'll most likely get a hondata s300. More safer route and I wouldn't want to waste the money I spent

 

Here is a better link to Xenocron's ETuning Service: Xenocron Tuning: E-Tuning Service