Reducing lag

[nogutsnoglory]

yeah but not sure whether its enough of a problem, as you could hear when it would connect to the coilpack on C4 but just unplugging it wouldnt actually make it run any rougher, whereas the other cylinders make an obvious running on 3 cylinders kind of noise

 

[DanGB]

would water/meth bring in power earlier, or just add higher power to current late power band?

 

[ibizacupra]

somethings just occured to me.. where has the apexi tapped into for its rpm input? coil #4 perhaps?

 

[nogutsnoglory]

good shout, got no idea. matt?

edit: actually i think it was the last owner derrick that got the apexi wired up

 

[IbizaAlex]

Are there any wires attached to the coilpack wiring? The race car did the same thing the other day, but then it was just that the spark plug had died.

 

[nogutsnoglory]

Are there any wires attached to the coilpack wiring? The race car did the same thing the other day, but then it was just that the spark plug had died.

Sorry for the poor quality pics, best I could get at moment

 

[nogutsnoglory]

Other pics of the bay at the moment, cheers to hooch for the pipework

What it looked like before for comparison

 

[IbizaAlex]

Looks much neater with that pipework . Its hard to tell with the wiring. Peel back the 'insuting' tape to get a better look.

 

[beattie17]

Apexi wiring is all done up at the ecu (well mine was, got instructions off matt), only wire in bay is the one going to gearbox

 

[nogutsnoglory]

Looks much neater with that pipework . Its hard to tell with the wiring. Peel back the 'insuting' tape to get a better look.

Cheers, it's slowly getting there

It is really difficult to tell, i've taken a couple more pics but nothing seems to be wired into it, only suspect bit of wire showing is the blue one in the pic.

 

[beattie17]

if you follow apexi wiring from thru dash/bulkhead you'll see where the wire is going to either ecu or coilpack, the rev signal wire is coloured purple at apexi end (may be different colour if someone has extend it).

 

[nogutsnoglory]

found out today that the car wasnt mapped with the apexi, and it was only wired up a couple weeks prior to me buying it so greig at total-vag is going to have a look at it for me.
does anyone know where i can get some instructions either posted or to download?

 

[nogutsnoglory]

think i found some
http://www.xspeed.com.au/manuals/AVC-R_manual.pdf

 

[cupra_matt]

Nope, the Apexi was wired up by me years ago, all wired to ecu end of wiring, only vehicle speed to gearbox sensor enters the engine bay.

I dont think it will be anything to do with the apexi to be honest.

As far as lag goes, i have a 1.9T running a GT2871R now and the spool up is about exactly the same as the ibiza was, the apexi was plumbed into only weeks before derrick sold it. It was mapped with N75 plumbed in. Plumb it back in and recheck, i reckon it will be much better.

Apexi was left in purely as a gauge, and was originally installed to control the GT2X. I bet its not setup correctly, takes ages of fiddling to get them right, no need for it on your car.

What are the results of the compression check? if disconnecting the coil pack makes no difference to it, then its got to be down on compression on that cylinder in my opinion.

 

[nogutsnoglory]

I havent been able to get to the garage yet, should be going next week, derrick said you wired it up a boost guage but he got it wired up as a boost controller from extreme performance not long before i bought it.
I think the lag is quite normal, I just wondered about ways to reduce it, i am finding my driving style is changing to suit it anyway!
It runs really fine under load and pulls very hard, its just on idle and crawling its lumpy.
It seems strange that when you unplug 4 it makes no noticeable sound but i think it revved like a bag of bones (bill can you confirm?) Whereas all the others you can tell straight away its running on 3 cylinders without revving.

 

[cupra_matt]

Nope, I asure you the apexi was fully wired in, Boost control soleniod was simple not piped in to the wastegate actuator. So its not wiring related anyway.

I had a SLK in work a few weeks back with similar symtons, threw up missfire fault codes now and then, was slightly missy on idle but drove fine etc etc, disconnecting cyl 3 coil made no difference. Turned out to be a bent conrod.

I think it may be down on compression, i might be wrong, but its defo not a problem with apexi wiring.

Matt

 

[nogutsnoglory]

I had a SLK in work a few weeks back with similar symtons, threw up missfire fault codes now and then, was slightly missy on idle but drove fine etc etc, disconnecting cyl 3 coil made no difference. Turned out to be a bent conrod.

Hopefully it isnt that! isnt uprating the internals supposed to stop things like that happening

 

[ryan_s3]

compression test then if thats ok leakdown test.

 

[ibizacupra]

it revved like a car with forged internals... some small end noise, but thats pretty common and something like my ibiza has done from day one back in 2005.. and still runs 500+bhp

not a bag of bones, just a noiser small end noise. something else in #4 cyl is going on, so the sooner you get that compression test and leakdown done the sooner you will know for sure

 

[nogutsnoglory]

bill i meant when it was revved without say coilpack 1 plugged in it missfired like it was obvious when revved, but i cant actually remember if it was like that when 4 was unplugged and revved.

getting the compression test done next week...

worst case scenario and i do have a bent rod or something like that is it going to be worth going 1.9 or can i buy a single rod and get it rebuilt?