[kevinca]

I had posted the thread "question about dynoing" and actually posted a detailed description there why I could not install the Hondata heatshield if you would like to read about it. Anyway, this is the before and after graph:

This is with the air/fuel graph:

Ok, quite a few guys on this forum have a similar setup to mine. Would someone please take a few guesses as to why I'm producing soooooo much less horsepower than them. Most with my setup are getting 220-230hp.
I know that heat was not on my side. It was over 90 outside, but is shouldn't have been that bad. Notice how it stops gaining at about 7k? What is your take? I'm anxious for an outside opinion, though I know none of you actually tuned the car....
Here's the setup:
1996 GSR
Jackson Racing S/C 8lbs
testpipe.com emissions legal cat
DC 2 3/8 cat-back,
DC 4-2-1 ceramic headers
CAI 2.5"
JR fuel regulator
B&M command Flow
280cc prelude injectors
AEM CAm gears at zero
vafc
msd6a
JR BTC

 

[BlueTeg]

For 200+whp your exhaust system is choking your engine in the top end. You should be running at least a 2.5" piping. Your header is also too small for the power that you are producing.

To free up your top end, you need to upgrade your header to one w/ a 2.5" collector (I think alot of the s/c guys on here recommmend the kamikazee 4-1) go for a carsound cat 2.5" and then to a 2.5" exhaut system.

Exhaust sizing is key to making top end gains....especially if you're motor is boosted. It seems like f/i engines can benefit greatly from a properly sized to exhaust to expell the burnt gases as quickly as possible. You might want to PM Gvtec and ask him what more you can do to increase your power besides the bolt on parts that I recommended here.

btw: 200whp is nothing to frown on

 

[MichaelDelaney]

Congrats. looks fantastic.

not to detract from your achievement and more in the spirit of info sharing, with 8 lb of boost, most people were making in the neighbourhood of 220-225 whp. So your engine has plenty on tap. The ambient temp. & exhaust system header selection & sizing are huge issues here as you stated. Nevertheless, there are a ton of people here who would kill for a power output like that, including the 150 ft lb torque. I personally would have moved the VTEC to 5300 rpm on this setup and it looks like she likes it a touch leaner from 5300-5800 rpm and 6300-7000 rpm.

Overall a nice tuning job.

 

[kevinca]

It was pretty funny when I took it out late Saturday night to get a true feel of how it was running. I went to a very popular spot in our town to run wide open. I lit up next to Kawasaki Hayabusa and he decided to just hang out next to me. Some high school boys saw me pull in to the gas station to fill up and stopped to tell me how awesome it was that I hung with that "dude on the motorcycle".

It gave me a good laugh

 

[hootb18]

glad to hear the tuning went well and everything came out ok.