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Discussion Starter #1
hi there..i just want to upgrade my ECU by using piggyback..what should i go for,Apexi vafc or unichip?
thanks
 

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Discussion Starter #3
i don't get it why you said that vafc2 is useless on a d17??
do you mean that vtec engagement in d17 cannot be adjusted?
 

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Pilawoos said:
VAFC will be useless on a D17.. refer the thread 'Vtec engagement' .. very valuable info for 7th Gen owners..
The vtec engagement point is at very low rpms, but you can adjust it anyway. Also you can use it to adjust the fuel map, with a new crower cam or for a d17a1 vtec.
 

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98 Civic EX
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for anything below doing a full out NA motor, or boosting...there is no need for a piggy back or anything for tuning...the obdiib ecu (7th gen) is a self adjusting ecu that will self adjust much farther than the standard odbii ecus...even if you were to put in a crower stage 2 the stock ecu will adjust itself to use it...as for the best piggy backs however, the vafcii might be your best choice...however for a good tuning you'll have to go stand alone, and as far as i know the AEM EMS is really the only one out there for the 7th gen civic...
 

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they are about 350 or so...
 

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i doubt it is because the D17 is really compatable with any previous d series engin. i could be wrong though!
 

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xrem said:
has anybody tried to use ad16a9 on a d17 head?Is the swap possible?:confused:
From this and other forums, the only heads that fit the D17 7th gen civic is its own head. I never heard, but maybe other heads of engines developed for other markets (japan, europe, brasil) may fit the d17.

Is good to know about the d16w8, a 1.6L with 3 stage vtec and 130hp (don't remember, but i think was developed on japan) that came on those 7th gen civics.

Someone should do that thing that many other did with older civics, import the loved jdm engines.

P.S.
If you ask wth is a 3 stage vtec, it is just that (like 2 vtec engagements). A vtec that have 3 intake lobes: primary, mid and secondary; plus the exhaust lobes. (info is confirmed with a repair manual). Sorry about the english, i commonly speak spanish.
 

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gmcuajo i've never heard of that engine!Is it possible to provide any links ti sites related to this engine?Sorry about the english i usually speak greek!

PS.Has anybody tried a cam swap on a d17 head?As far as i know a cam swap was possible in all d series engines,even if their displacement was different
 

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theres no such thing as 3 stage VTEC. i dont know where you got this from but its not so. your intakes are either running off the primary and secondary lobes,(normal operating lobes for intake valves) , or the VTEC lobe. i think your just confused cause the manual calls the 2 non VTEC lobes primary and secondary. its just terminology. one intake valve rides on the primary and one on the secondary all the time , when VTEC engages , they both switch to the middle lobe. all VTEC is 2 stages , engaged or not engaged . and as far as whoever thinks you can get a crower cam for ANY D17 , you show me where cause as far as i know they dont exist. and no , no other engine has a compatible cam for the D17.
 

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theres no such thing as 3 stage VTEC. i dont know where you got this from but its not so. your intakes are either running off the primary and secondary lobes,(normal operating lobes for intake valves) , or the VTEC lobe. i think your just confused cause the manual calls the 2 non VTEC lobes primary and secondary. its just terminology. one intake valve rides on the primary and one on the secondary all the time , when VTEC engages , they both switch to the middle lobe. all VTEC is 2 stages , engaged or not engaged . and as far as whoever thinks you can get a crower cam for ANY D17 , you show me where cause as far as i know they dont exist. and no , no other engine has a compatible cam for the D17. if you could get your hands on a D16W8 , would be a worthwhile swap in a 7th gen. im pretty sure a D16Y8 cam will fit in a D16W8. would open up the aftermarket world for ya anyways.
 

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WOW!!! i'm sorry to correct you blackDseries, but there is indeed a 3 stage vtec, and also the 7th gen civic didn't come with anything but a d17 with a non-vtec head or one with a vtec-e head, and thats it...nothing else...

to be honest, there are several flavors of vtec...you may want to go and do some research about vtec...the different flavors i know of are the following:
i-vtec
vtec
3 stage vtec
vtec-e

there could be more but i'm not 100% sure if there are others...but i do know of these four...
 

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I VTEC is same technology with hydrolic cam phasing. in a way you could call it 3 stage VTEC but not mechanically its not. besides I VTEC , theres no 3 stage VTEC. show me a link of a cam profile for a 3 stage VTEC engine please cause i gotta see. VTEC is on or off thats it. engaged or not engaged. i mentioned before , if your looking at a picture of a cam profile , and its terminology for the lobes on the cam go primary , secondary , middle for the intake lobes , thats not 3 stages. its just calling one intake lobe primary , and the other secondary and i have no idea why they do that. cause in essence both the primary and secondary intakes are primarys , and the middle or VTEC lobe is the secondary or bigger profile for high revs. for those of you not all that mechanically inclined yet , its like this , before variable valve timing , you couldnt get the best of both worlds , high revving profile and a profile that would allow the car to idle and drive half decent under normal conditions , plus throw in fuel consumtion , so on. thats why you hear an old muscle car with a cam i it idling , it sounds like it hardly stays running. all they had was vacuum advanced timing. meaning when the engine started to rev higher under load , the distributor under a vacuum driving it , would change the ignition timing by centrefugal action. as the centerfuge inside opened it changed when the rotor contact passed under the cap contact. anyways rambling now.
 

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here is the link describing 3 stage vtec...
http://asia.vtec.net/spfeature/vtecimpl/vtec1.html
the vtec works in 3 stages, first being the single valve working, and the second being both working on the primary lobe, and then the 3rd stage being actual vtec where it switches to the secondary more wild cam lobe...that is the 3 stage vtec...
 
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