16v Digfant II FAQ

[joshwidener]

did 16v swap and bbm rail and injectors , i extended fuel rail wire and now when i turn car over everything is working but the injectors , im getting fuel to the injectors. got spark , motor kinda turns slow but i have new battery and i checked grounds and put new starter in . maybe a ground isnt good enough im stumped and need to get it goin any help would be awesome

[joshwidener]

ok your the one i need to talk to ... so i swapped a 16v into my jetta and bought bbm fuelr rail and fpr adapt. and 30 pound injectors. i extended my fuel wire to reach . after done with swap went to start car and engine rotated slow so i found that my starter was bounding up so i replaced that then i checked spark and gas and had that but no fire so then i pulled rail connected to injectors to see if they were squirting and no there not any ideas on what might be going wrong all i did was extend that wire . i took ur advice on some other things u talked about in the thread like swappin the 8v tb was helpfull so any other thing u know whould help thanks

[aaronmcadoo]

I have issue develope over the last few months of daily driving my digi2 16v car. i have noticed a surge under heavy acceleration it feels like it momentarily looses power then comes right back (not a miss) keeps pulling then does it again.

motor specs
1.8 16v rebuilt 3500 miles ago
tt down pipe
tt cat back (gutted cat for now)

only does this above 4000 rpms at wot. no other time

any thoughts?

my first one is a knock sensor is taking a dive.
maybe my VAM causing my issue. I might pick up a bmw one this week also
injectors to small? stock digi2 injectors


wot/idle switches test out (might try another tb from the wrecking yard next week)
cts tests out
o2 is newer and tests fine


next swap for me will be CE2 in this car. so i can use this digi2 engine harness in my mk1 coupe


Edit

Fixed my issue it was timing

[VDub2506]

Just did a 2.0 16v 9a into my 90 G60 corrado. Running a chipped Digi I ECU

Ran into a problem. Idles fine but at 1300 (too High) and smokes to high heaven. Tried to adjust the idle but its all the way down. I might have a vacuum leak? What else might do this? Should I try unplugging the ISV?

[GTIINSIDE]

Just did a 2.0 16v 9a into my 90 G60 corrado. Running a chipped Digi I ECU

Ran into a problem. Idles fine but at 1300 (too High) and smokes to high heaven. Tried to adjust the idle but its all the way down. I might have a vacuum leak? What else might do this? Should I try unplugging the ISV?

I am also having same problem mine is also 16V 9A but ported head , DIGI 1 , ECU stock chipped w/ G60 Injectors and smell a lot of gas & black smoke a friend told to change G60 injectors to DIGI 2 injectors do this will help ?

[getamongst-it]

Just finished my Digi2 16v swap.

REALLY happy with it! thing rips!! only a few minor issues to sort out. so i have a few questions.

the configuration i used:

-ross fuel rail
-8v tranny
-8v clutch
-16v pressure plate
-lightened eurospec flywheel
-8v throttle body
-8v hall sender in the Dizzy
-Toywagen A/C delete pulley for 16v alternator

-black CTS in flange on side of head
-blue plug into 16v CTS
-left side knock sensor
-oil pressure sensor moved to back of head

If anyone has any questions let me know. it was really straightforward the only thing i'm dealing with right now is an issue where my idle surges up and down sometimes. Im running the 8V ISV right now and whether its plugged in or not doesnt seem to effect this. The idle screw is backed all the way down so that it clicks the "idle circuit" switch at rest fine. Keep in mind this has been a flawless running Digi2 car for the past 5.5 years that I've owned it.

when idling properly it sits at about 900-950, when surging it rests at 1100 and goes up to about 2000RPM then comes back down. if you load the car up (letting the clutch out till it almost stalls) you can sometimes stop this.

I think that is has to do with the fact my crankcase breather is run to a catch can. I have blocked off the small breather on the left side of the head above the intake mani. I'm going to try recirculating the crankcase breather to the intake tube so it's stock-ish and see if that fixes my idle surge. Does anyone think its worth blocking off the crankcase breather and running one of those ABD vented oil cap adapters?

just an overall update on this. car is still running solid besides the idle issues and i will be putting on a BMW AFM soon and 3.5bar FPR. i have plans for autotech cams and most likely the 7k TT chip.

one thing i did though which helped/hurt the car is put additional piping on the intake. i added about 10" in overall length so the AFM/filter are sitting up near the headlight. this helped because before i had an issue with my AFM literally falling off the intake tube. this has seemed to hurt performance tho and the car doesnt pull nearly as hard at high RPMS. i'm going to remove the extension and run it before i make the switch to the BMW afm to confirm this however. the 8V AFM seems to like roughly the stock length of intake.

[Wil Penney]

I need serious Advice on some serious engine mods ( 97 Jetta 2.0)

Langley BC
Iam brand new to VORTEX , but a real Dub enthusiast. Iam a mechanic by trade but now venturing into my first import engine build and swap.... Currently running a 2.0 8 valve in my 97 Jetta. But have just purchased a 1991 2.0 16 valve. My plans are to strip the 16v and build it. Although i want to make this thing STRAIGHT RETARDED, if ya know what i mean, yet street legal.I have many questions and need guidance from guys that know.
For example there 2 different fuel injection systems, do i go all new fuel management, stand alone or just piggy back off my stock system.
head work..... ported and polished??? how much can i port?
Valves and seat????? CAMS ?? i want 9 thousand RPM out of this thing, don't really need a crazy top speed, more just in town or quarter mile... throttle body ??what works best with a 16v
As you can see i need serious advice. Hope to here some feedback.
thanks Wil..............


Anyhow this what i posted just recently.. after reading what you wrote about your conversion, i realized that you most defiantly know what my concerns are. I hope that we can talk.

[montanagreenmk2]

thinking bout swaping my 8v to 16v this should come in handy

[eme411]

Have done a swap using the G60 digi 1, it starts but when I tried to rev it up it will stall and only idle when ISV is disconected.

Need help.

[pllucki]

Hello, how to move the limiter on ~7000 for free?


Change quartz ?

[thesk8nmidget]

im doing a 16v swap on my 1983 gti rabbit and the donor motor was already swapped to digi 2, my question is what wire do i give switched power to on the digi harness?

and is there anything else i need to do wiring wise?

[Gede Nimbo]

So my Digi conversion has been done around 2 years ago but I have kept the car in the garage.. Ever since I completed the full conversion, I have had problems with the oil level light blinking in the cluster and the Coolant temp light flickering.. Is there a way to go through this or a remedy for it? I used the Dig 2 sensors as recommended in the initial install diagram..

Thanks,
Chris

[DumpdDirTEEDubZ]

so have few questions. have a 88 gti 16v (ce1) and po swapped to digi2(ce2) but still has the ce1 fuse/relay blocks. had spark,fuel etc. tried to get started and lost spark....changed ecu, distributor w/ hall sender, and coil also checked all grounds still no spark.battery is relocated to trunk if that means anything. anyone have any ideas? must i swap new ce2 fuse block and harness and start new?

[mexvdubr91]

Hi guys,
I'm the process of swapping a 2.0 16v into my 86 cabriolet, I rebuilt the engine and added some small mods like autotech cams, raceland headers and solid mounts. As of today, the engine is already in the car but I am having trouble with the digifant 2 wiring harness. Ive seen a picture of a labeled wiring harness but I think that is from a digi 1, and from what I can see, it is a little different.
So what I need is a picture of a labeled Digi 2 wiring harness or something that could help me identify the pins.

Thanks for reading this. Any help would be very appreciated.

[laychooba]

question.

that hole to the left of my CTS, does it need to be blocked
off, or can i just run it open like that?

[92golft25]

i have the older 1.8 16v and can i use the 8v computer and harness and jus chip it??????????

[CaBrIo16v]

Is there anybody still using this thread?

[D727]

i have a problem with my 1990 gli with the midtroic system i was thinking of putting a carb on but want to keep fuel injection system could you send me step by step t help me with this conversion plz respond back

[jeremy_almond]

Why would you not use 16v injectors for a 16v engine and ecu?

[big_hot_tamale]

hey folks, read almost the entire thread, good stuff, hoping someone has some insight here.

I did a 16v 2.0 turbo install running Digi I from a Corrado. Almost everything is new, except the coil and 16v coolant temp sensor. The car starts and idles fine all day long, but boggs and bucks under load and sometimes when trying to hold revs in neutral.

the only major difference in install procedure is that I opted to not use the ISV. I'm in texas, we see 32deg F maybe two days out of the year (like tonight) so I don't mind warming the engine up a few min before leaving the house which is what I read people do when they do an ISV delete. Since the OBD2 throttlebody I'm using has no idle adjustment mechanism, I'm running a 1/8NPT bypass hose from the intake pipe just before the t-body to the intake manifold. I do have a ball valve inline but it seems to idle at a sweet 850-900 rpm with the valve fully open (so I prob don't need it, but it's there in case idle rises after being run a long time and I need to choke it a bit)

It's not turbo related, as I've disconnected the plumbing after the IC so it's basically like a N/A digi setup. The digi1 (corrado) co-pot aka. MAF is located 9" from the t-body and it ohms out good, set to 500.

gas goes form new fuel cell to new cis fuel pump to new inline filter to injector rail for 3.5bar fpr to return line/tank. I see a constant 48psi on my gauge at the end of the rail before the FPR during idle, but can't monitor it during driving. I'll try to rotate it and run w/o a hood or maybe install a pressure sensor/gauge later but I have no reason to believe it's starving for fuel. Running the pump to a bucket, it does surge which I know is bad for CIS but from what I read it's ok for Digi due to the lack of a diaphram/distributor.

And spark shows up nice when I use a timing light, and no arcing as i did a water mist test at night. again everything is new, brand new dist, cap, rotor, wires, plugs, o2, knock. Grounds are solid, running dual Optimas in the trunk and alt is putting out ~13.8. No vacuum leaks that I know of as I only have vacuum lines running to brake booster, ecu, fpr, boost gauge, and bov

I'm contemplating using the ISV, but I would rather not try to figure out how to custom fab it into the already diminishing space under the bonnet, so I'm hoping aomeone would have a say or other ideas to check.

ps. i also tried 2 diff chips in the ECU and the car performs the same using both a stock and stage4.

[Turbo3]

Can you use a 16V TB if you plan on not running an ISV?

[weejunGL]

ps. i also tried 2 diff chips in the ECU and the car performs the same using both a stock and stage4.

hopefully these chips are made for the engine? (2.0 16vt)? and not the 1.8 8v g60 engine?

engine destruction will be the result of using a G60 chip with a turboed 16valver

[big_hot_tamale]

hopefully these chips are made for the engine? (2.0 16vt)? and not the 1.8 8v g60 engine?

engine destruction will be the result of using a G60 chip with a turboed 16valver

That statement you made is a little misleading...

A 16vT, or any car for that matter running Digi I/II will run safely, forever, using -any- chip, as long as you aren't flooring it everywhere and esp if you drive it without building any boost. It just won't run very well.

It did not run excellent, but there was no engine destruction. air/fuel was reporting safe numbers at all times. Digi I runs simple maps between idle and WOT due to the lack of a TPS.

I have the BBM one in there now, and the car runs better, still working out problems at upper rpms... :/

[lil_squeeker]

Can you use a 16V TB if you plan on not running an ISV?

doesnt matter.
im using the 1.8 16v tb from a rocco with no issues, besides having to rewire the throttle switches.
first start up was with no isv (plugged), and it ran fine.

[oopseyesharted]

Ok. Here is a curve ball. I have an 85 cabby that is all stock. I want to convert it to digi 2.
How much of this 16v is going to apply to me?

[russland]

Hello, all!
build 16v on digifant 2 PB
I want to use the intake manifold from the engine ABF. Fuel rail from him, too.
The question remains on the Throttle Body. From 8v will not run.
this throttle body from abf


whether it is suitable for wiring digi
i am sorry for my english