16v Digifant 1 FAQ

[OhioBenz]

any good aftermarket will work as long as its designed for fuel injection and can handle the psi your pump puts out.
i like the aeromotive units from http://www.summitracing.com for about $130 or less.

[nitrous16v]

i just spoke with AMS advanced motorsport solutions and they still offer digi chip/ecu upgrades , rev limit is increased to 7000rpms and on the dyno they gained 11hp in the mid range and 8 hp peak. the dyno chart shows 93hp/105 ft/lbs tq stock and 102hp and 108ft/lbs tq with AMS chip/ecu upgrade. you need to send your ecu to them. application are
1987 1/2 to 1992 49state golf/jetta
1987 1/2 to 1990 california golf/jetta
1990-1992 cabrio
their contact info is.
AMS
1-310-763-8000
http://www.amspower.com
should work with 16v conversions

[OldSkoolDubbin]

Quote, originally posted by nitrous16v »

i just spoke with AMS advanced motorsport solutions and they still offer digi chip/ecu upgrades , rev limit is increased to 7000rpms and on the dyno they gained 11hp in the mid range and 8 hp peak. the dyno chart shows 93hp/105 ft/lbs tq stock and 102hp and 108ft/lbs tq with AMS chip/ecu upgrade. you need to send your ecu to them. application are 1987 1/2 to 1992 49state golf/jetta 1987 1/2 to 1990 california golf/jetta 1990-1992 cabrio their contact info is. AMS 1-310-763-8000 http://www.amspower.com should work with 16v conversions

that is for digi 2

[KingofNod]

Quote, originally posted by E60 »

doubtful. Your co-pot or your timing is prob. off... All of your gear in good shape?

Ignition timing? Pretty sure mechanical timing is dead on, or I can't imagine the car would run nearly as well as it does.

[E60]

Quote, originally posted by KingofNod »

Ignition timing? Pretty sure mechanical timing is dead on, or I can't imagine the car would run nearly as well as it does.

yes, your ignition timing. hell check the cam timing while your at it...

[KingofNod]

I spent plenty of time setting the cam timing. If its not dead on now, it never will be. I'll borrow a timing light, I gotta feeling its the ignition timing , as I never really set it with a light since I rebuilt the head.

[KingofNod]

Tried NGP? Maybe BBM? SNS chip works fine though.

[rocco858488]

Hey,
I am trying to figure out how to put Digi 1 on a 16v scirocco. I have a G60 with all the necessary parts, but I need a step by step (with pic.s if possible). Can you help me? Please send any info to scirocco858488@yahoo.com

[88Jetta]

VW CE2 fusebox pinouts -- gathered from a digifant 1 diagram

Connector F

F1 Red/Blk - starter – circuit 50
F2 ? blank ?
F3 blue - alternator exciter -- was in another harness so I cut
F4 Brown -- fuel after run
F5 Red/Grn—ECU #1
F6 Bk/R -- back up light
F7 bk/bl back up light
F8 brown -- crankcase breather (cut)
F9 color? Digifant control unit relay
F10

G1
1
2 br/w outside air temp
3 R/Y ECU circuit 3
4 Blk Coil #15
5 Br/Wh tranny ground
6.
7. blk/wht ECU #23
8. R/W o2 heater
9. ?
10. bk/tlw ECU #14 / ISV
11.
12. Red/Blk Coil #1

G2
1 g/bk oil temp
2 w/r outside air temp
3 y/r coolant temp
4 blk fuel after run
5 track 47
6 track 44
7 color? Internal track 44
8 color? Track 61
9 color? Fuel relay? Track #51
10 Y oil psi sender 1.8bar
11 bl/bk .3bar oil psi
12 ?

[veedubinit]

can you use a digifant 2 throttle body and sensors with digifant 1? is it just a closed throttle and opened throttle switch?
I am moving from digi2 to digi1, i got my stuff yesterday

[OhioBenz]

im pretty sure its just the IPS and WOT switches like on the Digi-II
i could look 4 u Sunday cos i got a G60 motor out in the shed...

people that go aftermarket management use the Passat or G60 auto TB's with the TPS setup.

[OhioBenz]

OK, heres my Q...

I'm building a NA 2.0-16v to go into my GLI and am switching to Digi-1 at the same time.
The motor is pretty drastically modded and will be running dual 58mm TB and getting a 50 shot of NO2.

I am looking for stock HP of around 200, and i know that the CIS-E fuel pump is said to be good for 400HP.... all that said, I plan to get rid of the out of tank pump and put in a higher flow/psi in-tank one.
What LPH does a stock VW CIS-E run? what LPH does it take to push 200+ a 50 shot??

[silvervwbeetle]

i have a 91 8v jetta from california, i am told it has digi 1. i am going to put a 16v in it, has anyone figured out this digi 1 system with a 16v and if so what did you do? do i just need a fuel rail and use all the 8v wiring and sensors?

[vwpat]

Quote, originally posted by silvervwbeetle »

i have a 91 8v jetta from california, i am told it has digi 1. i am going to put a 16v in it, has anyone figured out this digi 1 system with a 16v and if so what did you do? do i just need a fuel rail and use all the 8v wiring and sensors?

CA digi I is more like digi II but with diagnostics. The digi II procedure would be better for you.

[silvervwbeetle]

thanks for the help, thats what i figured

[kda33]

Ok I'm interested in doing this swap, however in an earlier post there was a mention of a BMW mass air flow can someone shed some light?

[rromero22]

I'm part way through the digi 1 swap but have a question on where to route the hose thats on the metal pipe since there no additional connector on the flange that holds the blue sensor.One end goes to the heater core and the other to the head. Do i block off that metal pipe? or what other option is there? Here's a pic. Thanks for your time.

[veedubinit]

Quote, originally posted by kda33 »

Ok I'm interested in doing this swap, however in an earlier post there was a mention of a BMW mass air flow can someone shed some light?

This is used with a Digifant II application, digifant I doesnt use a Mass air flow sensor.
There is a full thread devoted to DigifantII i suggest checking that out to see more info on the BMW MAF

[rromero22]

Who's done the digi 1 16v swap and can chime in on this one?

[rromero22]

I've figured it out, I guess you can just cap off a coolant pipe, they sell plugs for them if you have a extra outlet you dont need

[OhioBenz]

we did that on a GLI with a cap from Advanced Auto. It didn't last 3 months before cracking and needing replaced so make sure you get some quality ones when you do - and throw a spare in the glove box just in case.

[rromero22]

Thanks for the heads up on that, i'm not sure why some of the 16v had 2 outlets and others just 1

[zubzero2]

My advice, since i have a 2.016v df1 in my rabbit is to back the throttle screw out, sure it idels at 2000k once its warmed up, but when its cold it idells between 1000k and 1500k, might have to fiddle with the pettel a bit at first but once its idleing it stays.

[zubzero2]

CA digi 1 is a self adapting ecu where digi 2 is not, that is what i have in my rabbit. 2.0l 16v. Love every minuet of it. I even have a cone filter on it. Found an adapter plat at auto zone for 15 dollars, hooked it up to flaper box with out plastic box, made a custom braket and thats all she wrote. I'm curitly trying to figure out how to push the revlimiter back in the programing to 9k because of the fact that my car hits the rev limiter fast and pushes hard. the limiter is at 6 1/2 due to a perfomance chip my friend had and copyed and burn to a new chip for me. But in do time i will lern how to reprogram the ecu and start selling them.

[OhioBenz]

almost sounds like thats a candidate for a solenoid actuated idle screw - out for starting and back in for driving.... isn't that what the ISV is supposed to do? Maybe it just needs a restrictor to reduce the airflow? I bet it can be made to work once we figure out WHY the ISV doesnt work...
After all Digi-1 has one from factory and it works...

[OhioBenz]

oh - a CA Digi-1....thats not the same as the G60 Digi-1, its just a Digi-2....with polution control crap

[Muffler Bearing]

would the co-pot function properly if it were... say... in an itb manifold? or would it be better to have an airbox and mount the co-pot there?

but then, would having the itb's draw from one plenum kill the advantage that itb's have over a single throttle?

-j

[E60]

Quote, originally posted by Muffler Bearing »

would the co-pot function properly if it were... say... in an itb manifold? or would it be better to have an airbox and mount the co-pot there? but then, would having the itb's draw from one plenum kill the advantage that itb's have over a single throttle? -j

I dont think there would be enough vacuum @ the itbs to measure map. Plus ITB's pulse the air in, it doesn't just pour in. You would need to come up with a reliable source of vacuum. Also, programming this setup would have to been practically done in Atlanta on the SNS dyno with jwatts and mrkrad programming your set-up.

[KingofNod]

Wondering if anyone with an SNS chip is also having the warm start up issue, or if anyone else with the Digifant I swap has this issue. Upon a warm start, the car will run fine for a few seconds, then start bogging and backfiring, shooting black smoke out the back (bascially undrivable) for about 30 seconds, or until you rev the piss out of it. Then it runs fine. Any ideas?

[OhioBenz]

my chipped MOtronic does the same thing - it was the o2 sensor - when it switches from open loop start-up/cold mode to closed loop/warm running mode it starts looking at the o2 sensor values.

[Muffler Bearing]

Quote, originally posted by KingofNod »

Wondering if anyone with an SNS chip is also having the warm start up issue, or if anyone else with the Digifant I swap has this issue. Upon a warm start, the car will run fine for a few seconds, then start bogging and backfiring, shooting black smoke out the back (bascially undrivable) for about 30 seconds, or until you rev the piss out of it. Then it runs fine. Any ideas?

i had a stage 4 g60 that did something similar to that but the hesitation would start as soon as i started it up warm or cold. turned out my problem was a faulty ground in the o2 sensor/guage wiring.

-j

[OhioBenz]

Quote, originally posted by Muffler Bearing »

i had a stage 4 g60 that did something similar to that but the hesitation would start as soon as i started it up warm or cold. turned out my problem was a faulty ground in the o2 sensor/guage wiring. -j

the o2 is def the first thing to check, you can use a 94 ford escort 3 wire one for >$30 if you can splice wires.

[vee_dubb_gti]

Quote, originally posted by mrkrad »

no doubt ram air works, its not uncommon to see 2-5% gain in hp at 100mph+ you'd need to localize the best pressure point for ram air and haul ballz to use it. If you pick a poor design it might take 140mph to see actual gains. keeping the water out is important too, gotta look at the current ram air implementations lately and see how they actually work, its not as simple as ramming air into a filter

Ram air dosn't exist.

[KingofNod]

My 02 sensor is brand new, but I'll definatly check out the ground wire. I'm pretty sure I routed mine back to the battery ground, because the bolt on the motor mount had snapped off, so there was nowhere locally to mount the ground. Maybe I'll try it again somewhere closer to the sensor.

[vee_dubb_gti]

sounds like its in open loop and dumping fuel in like its cold.