Hello,

I have a 99 civic si with an 89 siR b16A swap head and block. It's running on a 99 em1 tranny. Has DC headers, aem cold air intake, and a 2.5" custom pipping with a high flo cat. I dyno'd it yesterday and it is only pushing 100 horses!!?? Timing is right, valves are adjusted.. Any ideas?

 

why take out the newer B16 for a 89?

 

I believe the previous owner blew the engine and swapped it. I bought it like that, and they are known for being capable of handling more power.

 

Are you running the correct ecu for that motor? Stock injector size, no fuel system tinkering?

 

^that was my next ?

oh I see....

 

I have a chipped P28 and the fuel system is fine. I believe they are stock injectors and also there is no mis fires.

 

Do a compression test to start with. That would be the 1st thing I would look at.

 

Did u check for any other codes?

 

If the AFR was in the sweet spot for power during your pulls you should be making more than that. Has the timing been tuned in on your ecu as well? If so, then perhaps it's a weak spark...are the plugs gapped correctly? wires/dizzy in good shape?

 

My spark plug wires are not so great but that isn't enough to lose roughly 60 hp. My compress is fine, checked that already. THe AFR was perfect. How is it possible to lose so much damn horsepower?

 

Also, no codes at all. Everything seems to be fine.

 

All that being said, how is your cat? Clogged maybe?

 

I don't have a cat, I have a test pipe on it.

 

try a new dyno

 

Ok, what did your compression numbers come back as? How does it pull on the street? Does it feel like 100whp?

 

Well the only thing I noticed is that my 3rd gear pull takes forever to wind!! Other than that My 1st-2nd is super fast and I hit 60mph at the end of 2nd gear. It had a compression of 10:3:1..It honestly doesn't feel like 100 horse power

 

plain and simple its a old worn down motor, op isn't telling us the whole story, sounds about right for a motor that is 20+ years old.

 

thats the pistion compression ratio 10.3:1

What compression numbers did you get on a compression tester?

 

Oh, I need to test that. I'll get on that today, I'm a noob. Should I bother rebuilding it or swap it to like a B20z2?

 

100 whp sounds right if you ask me. 20 years and a weak tune.

 

LOL

 

You need to go back to school and learn basic math

 

lol, wut? 2012-1989=23 years.

 

If it is a motor from 1989....... that's over 20 years.

Damn. Ninja postings

 

thats your answer

Honda's 160HP rating is at the flywheel
your 100HP is at the wheels

plus 30% of your wheel HP rating and you're about 130HP @ the wheels. take into consideration maintenance (or apparent lack of), age and wear & tear and it is quite understandable how you got that number.