Dyno run for 2003 factory EX

[82801BA]

I have run a dyno on my factory EX recently and discovered something probably weired. The max power occured at 6250rpm and rated 105.2HP and torque at around 4700rpm rated 100.8lb-ft. Is there something wrong there? It sound like the engine has no VTEC kicks in and that the power is even poorer than an HX....I have seen an 96-00 HX chart with power at 105.xHP and 99lb-ft torque factory....No modification to my car, and I did turn off every electrical thing. The A/F ratio of my car is always at around 12.4....What does it mean?

To remove this ad, register today for free or log in if already registered!

[82801BA]

Also is that I installed a VAFC before and at 70mph the check engine light always come on and then I removed the controller and use only the fuel portion of it. The HP even went down to 102.8HP. WHat is the problem of the VTEC portion of the controller(cause check engine light on)?

[CapYoda]

hmm. i was going to say 105 sounds fine.

then u mentioned the vafc and the check engine light.

vtec might not be engaging..

stock EX usually puts down around 110 whp.

you gotta remember its whp. we're generally around 100-110

and u can't compare dynos directly since different dyno at different location in different car gives different numbers.

which VAFC is this? the apexi? did you install it correctly? search on how to install it without triggering the CEL

[82801BA]

The VAFC I used was the first version, not the VAFC-II. I have my friend worked on that but still can't get it fixed. When I was in 1st and 2nd, the car really pulls from 5500rpm on(I set the engagement point at 5500 initially), then 2nd, fine. Third, at 4000rpm, the light comes on with the code "VTEC rear band, code only, OK to drive"....Even 4th and 5th does the same at 70mph.
Therefore I returned the unit to my friend. Does VAFC-II work in this car with proper connection?

[INCivic]

i heard that there were alot of probs wiht the vafcI and that they fixed it with the II

[82801BA]

The dyno graph after I removed the VAFC shows a almost straight line from 3000 to 6800(where I set it to be the cut off), only +/- 1HP at several points. Normal?

[82801BA]

Because of the graph and the number showing, the guy who did the dyno for me even asked me back if my car was an EX....

[FuzzBeC00L]

105 sounds good.. what did you think you where going to get 454whp come on its a honda

[gearbox]

The numbers look right. Anywhere from 100-110 whp is acceptable. VTEC engages around 3k rpms, but remember that it's VTEC-E (economy vtec) and doesn't help much for performance.

The original VAFC has problems with the check engine light and vtec. The VAFC-II has solved all this. Haven't you guys been reading all the threads posted about this?

[Philip]

well, was your engine broken in prior to the dyno runs? and you shouldn't be gettin constant Stoic 12.4 A/F reading, if you are doing WOT which you supposed to do on a dyno. a rich situation would be correct. it's also maybe your v-fac controller.

[white2K2EX]

Originally posted by gearbox
but remember that it's VTEC-E (economy vtec) and doesn't help much for performance.

I thought the EXs had regular VTEC and the HXs were the only ones with the lean burn VTEC?

[Civicster]

itz a civic with a d17. what did you think your car was? an si?

[gearbox]

EX and HX both have vtec-E. The HX just has a lean burn version of it. The window sticker should say that--mine does.

[oohooh]

105 whp and 100 wtq is normal. I actually have seen tq numbers on an ex which was lower than triple digits.

[82801BA]

My EX doesn't say anything about VTEC-E. Still, it is ULEV rating, which is the same as the 2004 Acura TL. So I feel that it should be a regular VTEC, and VTEC-E actually has the VTEC-E embedded on the engine valve cover's electrical cover. And people told me that the car kicks in at around 5500 instead of 3k. It seems weired to me that the D16/D17 VTEC are classified as a VTEC-II, and VTEC-E for HX. Pretty confused.