Dyno time! Mugen header and exhaust VS. bone stock on a 5th gen... - Honda Prelude Forum

aklucsarits · 11-26-2001, 12:55 PM

Well, I posted this in the General Prelude forum already, but I figure people in this forum would be even more interested...

I finally got a chance to dig up my bone stock dyno files from March and compare them to the runs I did last Wednesday afternoon. I was really impressed with the results. The 2 runs were done on the same dyno at ERT in Delaware, and the atmospheric conditions were identical on both days.

2000 Honda Prelude Base 5spd
Run 002 - Mar 21, 2001
Milage:~15,000
Conditions:49.65F, 30.17in.Hg., 0ft.elev, CF=0.95
Mods:None, Mobil1 oil

Run 003 - Nov 21, 2001
Milage:~27,000
Conditions:50.21F, 30.22in.Hg., 0ft.elev, CF=0.95
Mods:Mugen Header, Mugen CatBack, K&N drop-in filter in stock airbox, Removed air intake resonator, Mobil1 oil

My peak WHP went up 10.6HP, and peak torque at the wheels went up a modest 3.8lb.ft. These peak numbers sound like a nice gain, but they only begin to tell the whole story... The best part is the consistant and substantial gains across basically the entire powerband from 3500rpm onward. Gains of 4-8HP and 2-7lb.ft were seen from 3500rpm-4900rpm. And gains of 8-12HP and 8-12lb.ft were found at 6000rpm and up!

The one area that I found odd was that there was no significant change in power in the VTEC crossover range of 4900-5200rpm... Could this be a fuel starvation problem?

I recently saw another dyno of someone's OBD2 Prelude where the owner dynoed the "ECU reset". He dynoed before the reset and then after the reset and gained 3-5hp across the whole rpm range. I decided to try the same thing. But I got jack as far as gains go. I gained maybe 1hp if I was lucky. It was not a significant change on my car. This may have something to do with the relatively cool temperature conditions I dynoed under. It may also be something to do with my 2000 "OBD2ver2" ECU. I'm open to other theory suggetions...

Anyway, here are the plots...
SAE Corrected HP and torque:

Actual HP and torque:

I was happy with the results. 11+ warranty-legal bolt-on wheel HP is good in my book!

Andrew

EDIT: dyno links fixed...

DYI01 · 11-26-2001, 01:05 PM

now get a VAFC, tuned and see the results

andrewdelvard · 11-27-2001, 02:38 PM

Great topic mate well put forward. Thanks for posting it

gLudeous · 11-27-2001, 03:12 PM

Yay someone A/B'd these! And what's even better is even though they weren't done on the same day, the temperature was the same both times.

aklucsarits · 11-28-2001, 05:01 AM

Thanks for your kind comments guys!

DYI01: I can't get a V-AFC - that would void my warranty...

Andrew

muncher · 11-28-2001, 07:35 AM

Quote:

Originally posted by aklucsarits
Thanks for your kind comments guys!

DYI01: I can't get a V-AFC - that would void my warranty...

Andrew

If you install the VAFC using a harness, will the dealership be able to tell if you just pull it out before they service it?

Two-Five Boy · 11-28-2001, 07:37 AM

Quote:

Originally posted by muncher

If you install the VAFC using a harness, will the dealership be able to tell if you just pull it out before they service it?

Absolutely NOT, that's the beauty of it!!

Jacques · 11-28-2001, 07:30 PM

Great results, Andrew!

gen5 · 11-28-2001, 09:21 PM

very informative. thanks, man!

Hambones · 11-28-2001, 10:43 PM

Thanks dude... I have wondered about that for a long time... now drop in an AEM CAI and dyno again

MugenPoweredLude · 12-20-2002, 03:56 PM

do you think you would gain more if you had a high flow cat???

JC-DC2 · 12-20-2002, 04:26 PM

Nice, well-explained write up. Thanks for posting this up!

NoRice4U · 12-20-2002, 04:29 PM

Quote:

Originally posted by N2oSH
do you think you would gain more if you had a high flow cat???

yes he would have gain a little more whp w/ a high flow cat. But I think VAFC will be the best choice

...man this thread is old lol...

sharkcohen · 12-20-2002, 04:31 PM

Quote:

Originally posted by N2oSH
do you think you would gain more if you had a high flow cat???

Back from the dead

Yes, a high flow cat would probably be worth a few more ponies.

aklucsarits · 12-20-2002, 06:03 PM

Yeah, it's really old. Happy Birthday to you thread!

Quote:

Originally posted by N2oSH
do you think you would gain more if you had a high flow cat???

I don't see how it could not give some gains. The stock cat has flanges that are 2-3mm smaller in diameter than the Mugen piping at both ends.

Andrew

2Longfour · 12-20-2002, 06:49 PM

Andrew, did you finally sell those OZ Superleggeras?

azninside · 12-21-2002, 12:54 AM

^^ yet again....this doesn't help the other argument bout mugen header vs DC header, or mugen exhaust vs any other exhaust....that an the dynos were done at different times of the year, so that means that the car is probably running different and at a different temp

I'm not saying that this is a bad thread...just that it's not a major statement or factual proof :

:

azninside · 12-21-2002, 12:55 AM

oh yeah....where do we put the candle?!

(over one year old....::hint hint:: )

hwani.h22a. · 07-14-2004, 07:07 PM

Holy Crap, factory freak? or is this for most prelude base?

I am very impressed with the results. excellent comparison and write up man.

Anybody in here thinks "Mugen" parts are actually gaining more than common parts we have? (such as DC/Greddy/etc products)

soccer3303 · 07-14-2004, 07:21 PM

HOLY BACK FROM THE DEAD POST BATMAN!