Hello, I recently got my 1999 Civic Si w/ 60k miles Dynoed.

The engine mods are:
Skunk2 Intake Manifold
Fake J's Racing Intake
NA Thermal Exhuast Cat-back
DC 4-1 Header
Apex'i VAFC

The ECU is stock and everything else. My Dyno number came out to be

129.5 WHP @ 8001rpm
98.2 ft/lb torque @ 2626rpm


I was kind of disappointed to see how low of an HP result I got, once again everything else is stock on my car is it came such as spark plugs and wires, grounding things, stock internals. I'm thinking my catalytic converter could be holding back a few HP. Would anyone have any suggestions as to why my WHP came out a bit low ? Normally Civic Si's 1999-2000 make around 140WHP stock. Any suggestions would be great, Thanks a bunch.



Modified by BluSiBoy at 10:07 PM 9/23/2004

 

What did the air fuel ratio look like.

Also if that was good do a compression and leakdown test.

 

i dont have any experience with dynoing B16s but i will bump this for you and hopefully some people can give you some insight on bettering your numbers. did you make any changes to anything when you had your car on the dyno, or did you just do one pull???? it is hard to adjust anything with your stock ecu, you are adding some airflow but you arent adding any fuel to compliment it. so maybe a chipped ecu or vafc would help... also that stock cat probably isnt helping anything and i am assuming your header doesnt have a 2.5" collector... you might be able to pick up a couple hp there. i hope somebody with more b16 experience chimes in and gives you some pointers as well

 

What type of dyno? Some dynos just read lower such as a Mustang dyno. The tq and horsepower seem to be inline with each other. It sounds like you were on a dyno that just read low.

 

The dyno was a Dynapack. It is the "portable" type Dyno. Here is more info on the actual machine.

http://store.yahoo.com/sgpraci....html


And thank you for everyone else's input so far.

 

have you ever raced a stock si before?

do a compression and leakdown test, as stated above.

 

BluSiBoy


I had almost the same numbers you did when I did a baseline run before I had my motor built (b17a). After the motor was built, the numbers were still kinda low so the shop suggested that we remove the cat to see if it might be clogged. Turned out that it was and I got a HUGE increase in power. Since your SI is a 99 with only 60k, hard to say if the cat is bad already. It's possible if you are running super rich or have a bad o2. Good luck!

HTH
1.7na

 

Had my B16 dynoed on a Dynapack as well, I made 168hp with 118tq, but then again I have other mods done.

Why is your HP RPM at 8001, and your torque RPM at 2626?

BTW, Dynapacks reads HP to the hub not wheels.

 

is your vtec engaging at all?

 

[<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1.7na &raquo;</TD></TR><TR><TD CLASS="quote"> the numbers were still kinda low so the shop suggested that we remove the cat to see if it might be clogged. </TD></TR></TABLE>

that would be my first guess.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blusiboy &raquo;</TD></TR><TR><TD CLASS="quote">The ECU is stock</TD></TR></TABLE>

that is the problem

 

Yes I'm going to try to do a compression test this weekend, Thanks.

IF Dynapack reads HP to the hub and not wheels...then would that mean I'm making more or less at the wheels ?
Also my RPMs were at the #s becuase thats where HP and ft/lb were at thier highest point.

Yes my VTEC is engaging I could tell by just the sound alone and the rise in the line on the graph.

I'm going to see what I can do about the cat, if compression comes out ok then changing the cat. will be my next attempt when I have $ to spare again.

I don't think the stock ECU is the problem becuase the modifications I've done are pretty minimal and basic, I don't think these mods will inscrease air flow THAT much. I think the VAFC should be able to take care of what I've done so far to the engine. If this were a Turbo situation then yes I would agree with you.

Thanks again for all the input people I really appreciate it. All ideas are welcome.

 

At one time i had a stock B16A2 with minor Mods Intake, Exhaust, JDM Header, stock manifold Basic bolt ons. wasnt happy with Dyno switched to OBD1 major improvement. Try that get a Jumper and P28 Chipped you wont be dissappointed.

 

Those numbers are low for your mods...Somethings wrong

 

How much could I gain by getting a chipped P28 w/ decent tuning ?

 

You can use your VAFC to fuel tune. It's not as good as hondata, but with your set-up its good enough.

 

Damn, a b16a3 that I just put in my car BONE STOCK. from the honda air filter/air box/ to the cast exhaust manifold and exhaust system.

135 whp and 98 ft lbs. Maybe there is a difference between dynos. What is the altitude of where you are at? what octane do you usually run?

 

your cat is fucked, my cat fucked up real bad at 50 thow, if i was you i would head back to dyno with no cat

 

I use 93 Octane always of course. Altitude is really close to sea level I dynoed around Houston, Texas.

Ya I'm saving up to get a Carsound HI Flow cat now and might as well just go ahead and also go for chipped P28 for the future while I'm at it.

Thanks again for all the helpful responses.

 

that is horrible my D17 dyno'd at 128. hp and 110.1 tq to the wheels on a dynojet.
I agree with everyone else, the cat is most likely the problem.

 

Do a compression and leakdown test first to determine if rings/seals are still good.

 

is your timing set right&gt;?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WAFFLES &raquo;</TD></TR><TR><TD CLASS="quote">Do a compression and leakdown test first to determine if rings/seals are still good.</TD></TR></TABLE>
yes this is def the first thing to do. those numbers are way too low for a b16
stock they make 134whp/98lbs, and since your torque is not that bad i say the timing belt dint jump a teeth, even retarted almost all the way your numbers should not be so low so a compression test is def in need before you do anything else.also as far as the cat i would dout it would give at an early 60k.
dynapacks numbers are lower than dynojets but usually only 4-5whp the most.
btw what was vtec set at?

 

Thanks for all the input I REALLY appreciate it all. I'm going to try and get a compression and leak down test by this weekend.

My VTEC by the way is set at 5,400 RPM since you were wondering.

 

A compression test is super easy, you can buy a tester yourself for about $20. The leakdown is a little tougher though. I would do a compression first anyway.