Fujitsubo + Hytech round 2 dyno ... - Honda Prelude Forum

Artifex · 07-15-2004, 08:07 PM

Okay, here's my new dyno plot! I hit the local dyno shop this afternoon, and I have a new baseline on the car. For this latest plot, here are the engine mods:

Type-S intake with K&N filter
UR type A alternator and PS pullies
Fujitsubo header
kteller8 2.25" cat-back piping
Hytech twin-loop muffler
Carsound hi-flow cat #94065
Thrush 36" resonator
V-AFC

EDIT: Car is a 2000 Base MT, 64k mi. Numbers could be made higher, because I haven't had a valve adjustment or cap+rotor replacement, ever. Soon to be corrected.

AFR:

These gains are totally awesome. I am incredibly pleased.

Not only did I gain 10 WHP at the top, but the entire torque curve is up by approximately 8 ft-lbs across the board. Super excellent.

Note that this difference is between the last Fuj header dyno and my full cat-back. I lost power when I added the Fuj by itself, and I think that is partially due to a freakishly high baseline dyno. I am now quite suspicious of it, because it is quite a bit higher than most baseline dynos I have seen (that's the best explanation I have so far).

The difference from when the car was bone stock is here:

Gains aren't quite as nice. Still a solid 2-3 ft-lbs from 3k onward, and 10 WHP peak.

I could have bumped up my peak WHP a little by playing with the VAFC, but I am in a strange situation right now with the VAFC, because it is controlling my part throttle tune as well. I can't mess with it at WOT without messing up my current part throttle settings, which are more important to me in the short term.

I am in the process of going with OBD1/Crome, so I will have much better results when that gets finished. I will have dyno differences when my car goes back on the dyno for my tranny measurements.

4thGenReady2Go · 07-15-2004, 08:27 PM

cool, very interested in the Fuji header, so thanks and keep it up.

marcucci · 07-15-2004, 08:30 PM

Was this back to back? Different days? If so, what were the temp/humidity numbers like?

White98SH · 07-15-2004, 09:25 PM

i assume this is an SS? if so, very nice numbers.

alphajesse · 07-15-2004, 11:33 PM

Quote:

Originally posted by marcucci
Was this back to back? Different days? If so, what were the temp/humidity numbers like?

They are 9 months apart, if you look at the file dates at the top of the first image.

Ken, I wouldn't be suprised if you gained with the current exhaust setup versus the stock exhaust, but I dunno about that much of a gain.

What were the correction factors? Or even better, do you have the runviewer files?

h22 bb6 · 07-15-2004, 11:36 PM

Quote:

Originally posted by White98SH
i assume this is an SS? if so, very nice numbers.

Noooo... read his profile. '00 5-speed.

One Slow Lude · 07-16-2004, 05:15 PM

Nice gains throughout the whole RPM band

NotoriouSH · 07-17-2004, 10:16 PM

A solid graph with good gains, maybe for a header only. With that many mods it's overall pretty weak IMHO. I would expect to see 10 whp and solid torque increases off the fuji header alone.

Artifex · 07-18-2004, 12:18 PM

Quote:

Originally posted by NotoriouSH
A solid graph with good gains, maybe for a header only. With that many mods it's overall pretty weak IMHO. I would expect to see 10 whp and solid torque increases off the fuji header alone.

I agree. I am hoping that graph will be higher once I get my OBD1 conversion complete. I finally gave up on my crappy ROM emulator and I am buying a ROMulator.

It is possible that the Type-S intake may not be ideal for wilder I/H/E setups, so I am looking at alternatives for that. I may try and pick up a J's style "sausage" and see if there are gains there.

leptolude · 07-20-2004, 07:55 AM

... i dont think those are bad numbers, 172 for basic bolt-ons is in the ball park. But dyno testing (as its typicaly practiced) is realy.... difficult. A head to head test on the same day with only 1 (controlable) variable change at a time is the only way to get good data (its also pretty expensive to do

).

No supprise on the lost power from the Fujitsubo change only. My prototypes included, headers dont seem to yield more than a few whp over the OE manifold, and if you dont have an ACCURATE baseline the gains can disapear in the noise induced by all the many variables (temp, humidity, pressure, fuel, tire pressure, chassis dyno mounting variables, state of enigne maintanance etc etc). Anyone see any GOOD header only dyno tests?

ThatPreludeGuy · 07-20-2004, 04:11 PM

Quote:

Originally posted by leptolude
... i dont think those are bad numbers, 172 for basic bolt-ons is in the ball park. But dyno testing (as its typicaly practiced) is realy.... difficult. A head to head test on the same day with only 1 (controlable) variable change at a time is the only way to get good data (its also pretty expensive to do ).

No supprise on the lost power from the Fujitsubo change only. My prototypes included, headers dont seem to yield more than a few whp over the OE manifold, and if you dont have an ACCURATE baseline the gains can disapear in the noise induced by all the many variables (temp, humidity, pressure, fuel, tire pressure, chassis dyno mounting variables, state of enigne maintanance etc etc). Anyone see any GOOD header only dyno tests?

And suddenly I'm not bothered by going back to OEM from my N2/DC copy header.

One Slow Lude · 07-20-2004, 06:50 PM

Quote:

Originally posted by Artifex
It is possible that the Type-S intake may not be ideal for wilder I/H/E setups, so I am looking at alternatives for that. I may try and pick up a J's style "sausage" and see if there are gains there.

i was thinking of gettin a type-s intake and getting rid of my AEM CAI, let me know if that would interest you at all