I put a kiddracing header on my ls/vtec last week. On the dyno I lost 10whp compared to my tri-y. The dyno sheets they have show a ls/vtec making around the same power as mine with a tri-y(191 for me) go up to like 203 with their header. So I'm kinda wondering what happened cause power fell after 7k bringing my power down to 181whp and the header was the only thing different. Any ideas on what I could do make up the top end loss? Or should I throw another tri-y back on?

 

Did you use the same dyno..?

 

Please post you dyno with A/F if possible.

 

It sounds like it really leaned the car out. Do you have an afr meter? Stoichometric, with an exact number, not just a narrowband o2 sensor with a guage that is either red yellow or green.

 

Dyno sheets and afr plots are necessary. Were the tests done back to back on the same dyno?

 

Too many variables...

 

The test was done in january with the tri-y and the kiddracing was done Friday. It was on the same dyno

 

Did you re-tune the engine?

 

Yeah we tried some things but only increases in mid range were made. Power past 7k is where the 10hp was lost and nothin seemed to work to get it back.

 

You can't compare dyno sheets from 9+ months ago.

 

Post up the specs on the engine.

 

Ya you need to dyno tune both of them back to back

 

I really hope you didn't expect the same results as the graph on kiddracing header FOR SALE posting.
The blue line, the TRI-Y was untuned. You can tell by the horsepower curve. To get REAL results they need to be compared Tuned to Tuned. Not untuned to tuned. You have no idea what gains the tuning did for the car. It may have been 10whp and the header made 5whp.
Or worse lost power, like your case.
Ideally same day back to back is best but at least you are on the same dyno.

 

when the test was done, what correction factor was used on the dyno? was it the same one used on the dyno test 9 months earlier? what type of dyno were you on? Contrary to popular belief, if it's the same dyno, using the same correction factors (ideally SAE), you can compare your results. That doesn't mean that the header is the only thing wrong, maybe you're running a cat convertor that's starting to go or there's some other proplems with the engine but that's only a possibility. As others have said, a dyno graph with air/fuel info is what we'd need to see to help with the diagnosis. Another easy thing you could do is swap your old tri y header back on and see what you get for results. That'll let you know if it's something other than the header that may be causing a problem.

 

The set up is b18b1 with knifed crank,machined rods,rs machine ctr spec pistons,acl bearings,arp rod bolts and headstuds,ctr crank pulley,tpr breather kit,b18c1 head,buddyclub spec III cams,ferrea flat face valves,ctr springs and retainers,aem cam gears,1st gen skunk2 intake manifold,65mm throttle body,password jdm intake,kiddracing header,apexi n1 exhaust,walbro 255 pump,golden eagle rail,290cc injectors probably missing some lil things but that's what I can think of off top

 

Hmm... I've been wanting to do a header shootout between the knock off headers.

 

forget that kidd header... that is the reality

 

setting up a dyno day for next week. gotta wait till pay day lol. gonna put the tri-y back one and see where we are. if its good then im gonna look into a 70mm tb and plenum and go for some further tuning.

 

Keep us posted on back 2 back results.

 

 

From your list I would make some of the following changes.
Drop the password jdm intake and get a 3" CAI with a Velocity Stack.
The 1st gen skunk2 intake manifold is known to have the incorrect runner angle for the B18c1 head, get the newer Skunk2 Pro Manifold.
Your 65mm TB is fine, no need for the 70mm.
Lastly look into larger injectors, FIC 525's would be my suggestion, they have an improved spary pattern over the RC style.

 

in for the comparison, I've been thinking of getting rid of my tri y for something else.

 

I really wish some of you guys would use your head.

He cannot POSSIBLY compare a dyno from JANUARY with one in OCTOBER. Seriously? Thats an honest comparison?

What if his car made 200whp in JAN, but made 190whp in October?

Guys , if you are going to do a TEST, DO IT ON THE SAME DAY AND BASELINE BOTH HEADERS.

I dynoed 201whp with my ITR engine , 2 months later i went to a dyno day on the SAME DYNO at the SAME FACILITY and made 194whp. I had a kid make 198whp with his LSVTEC and 3 months later make 187whp.

So my point is, if you made XXXwhp months ago, there is NO GUARANTEE you are making the SAME hp NOW. So when you put MY header on you could have actually MADE power but we will never know because you didnt baseline your Tri-Y header the same day you installed mine.

My header makes power , i stand behind it. will it make power on EVERY SINGLE setup? i cant guarantee that because there are too many variables, threads like these, and i cant control how well your engine is built, what your timing is set to, who is tuning your engine, etc.

But i can say this, 99% of my customers see some kind of power gain, some see more than others.

 

And no offense that is a horrible engine setup. LSVTEC with CTR PIstons and a GSR head? You know the CTR Pistons will hit the combustion chamber of the GSR head right? Itll throw a rod you may want to look into that

13.X:1 compression is your problem, you are prob detonating like crazy

 

Do not start that flame please. Very fair comparison made here... and we belong then to the remaining 1%. I do not care who believe it or not. I know what I have to know and you probably think the same. Thank U.