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10-19-2018, 09:19 AM | #1 |
Scooby Specialist
Member#: 111755
Join Date: Apr 2006
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car is together -JDM EJ205 -avcs necessary?
Symptoms seems to be:
when driving out of boost, car runs pretty good, responsive. once manifold air pressure gets to positives, timing seems to be pulled way back and its like someone just threw a scarf over your mouth when u want to start running. the car just feels a lot of hesitation. no misfires and no knock, fuel numbers also look good. Only thing i can think of is IAM is expecting AVSC but its not wired and im left with really retarded ignition timing? no engine codes. I got my jdm ej205 in and had a few kinks along the way.. seems to be ironed out now 1. exhaust leak at downpipe -> midpipe 2. injectors not installed correctly, causing a lot of fuel in the engine bay... ok so i now have JDM ej205, AVSC not wired TGVs 9:1compression ratio vf48 Walbro 255 Stock airbox STI Dark Blue Injectors (scaled correctly) stock 2 port boost controller 3" turbo back Am I missing anything in the carberry maps that help the engine once boost is coming in from vacuum state to positive manifold air pressure? turbo does want to spool up once its gets to 5 psi it will wind out to 18 and hit fuel cut, but during the entire boost sequence ignition timing is pulled. ideas?
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10-20-2018, 08:48 AM | #2 |
Scooby Specialist
Member#: 395793
Join Date: Jul 2014
Chapter/Region:
Tri-State
Location: SLC and Lake Placid
Vehicle:2005 92x Aero Beige |
Are you running the avcs cams, gears, and sensors? Not meaning functional avcs but just the avcs parts are all in place and in original condition.
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10-30-2018, 03:04 PM | #3 |
Scooby Specialist
Member#: 453872
Join Date: Sep 2016
Vehicle:2005 wrx wagon 48w |
have you tuned any of the carberry maps or did you load it and go? you need to log your original rom and build a MAP based timing table from that. the stock timing is MAF load based. are you running MAF mode or SD? set all of your WG cycles to 0% so its not boosting past wastegate for now. then tune all your timing up to that point. once its all tuned up to wastegate level you can add a few % to the duty cycle to get into the next MAP column and tune it and so on until you reach the desired boost level eventually.
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10-30-2018, 03:24 PM | #4 |
Scooby Specialist
Member#: 111755
Join Date: Apr 2006
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hey guys, thanks for reaching out.
OK the carberry map was too.... agressive? It was always hitting fuel cut and for some reason it just never ran... right? I am used to driving a protuned td04 with light blue injectors. so the new engine and vf48 felt like it wasn't starting to get any power until 4k rpm. Fast forward to today. I just got AVCS working since a new map I am using has the codes appearing. I just stabbed away at the wiring until i got the codes to disappear! whooo hoo! but other than that, I am seeing boost come on earlier - getting into positive manifold air pressure earlier, like 2400 rpm, but it spikes up at 25 psi and then drops to 16 psi to redline. Fuel on the wideband looks good, hitting 11s-13s on WOT in boost, which i am pretty happy about, seeing as this has been a bit slapped together. if you guys look at this map, the above tables are my OLD protuned map. I mean this is OLD, like the map was ecutek minted in 2003. I know tuning has come a long way since then, but this made the car feel really good around city, and sure it could have used more top end but it was only a TD04L.. Would you think its safe to run these boost targets and wg duty on my new setup? Fuel trims do look good and I'll eventually start logging this (no cable) would you see anything else in my specs in my first post that could support my power goals? (300whp) or anything I should look for with a VF48? |
10-30-2018, 04:31 PM | #5 |
Scooby Specialist
Member#: 453872
Join Date: Sep 2016
Vehicle:2005 wrx wagon 48w |
how are you controlling AVCS if your not on carberry? you pretty much changed everything about the engine so the whole map needs to be thrown in the trash and built from scratch. the carberry map is just a patched tune from some JDM car. its not a tune on its own. its like starting from scratch. you need to build the timing map and verify the maf is reading right (or start making a speed density map). and retune all the boost control because it works differently from a standard 2.0l rom. the "stock" carberry boost values are designed around a twin scroll jdm turbo so they wont work so well with a regular old vf turbo.
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10-30-2018, 08:38 PM | #6 |
Scooby Specialist
Member#: 111755
Join Date: Apr 2006
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Carmel, I forgot to mention, I am using a jdm ecu v7 for the ej205. Its also been flashed but, with injectors scaled and probably using wrong boost tables...
Hence, looking for help with the vf48... |
10-30-2018, 10:13 PM | #7 |
Scooby Specialist
Member#: 453872
Join Date: Sep 2016
Vehicle:2005 wrx wagon 48w |
so you are running the EJ207 map? its probably pretty close to the carberry map anyway. carberry is super sweet but you have to put in some time tuning the tables in just like any other rom. is the rom you are running working ok for now other than the boost issue? if so zero out your wastegate duty max table. slowly add a few % in the full throttle column until you just reach target boost. that will get you to an ok boost control where you wont overboost like crazy. if you want to run carberry you should log a bunch of data with g/rev, ignition total timing, and MAP. to translate the timing map from g/rev to map. then you can reflash carberry and it will run similar timing as you did before. but it will run better.
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04-22-2020, 02:52 PM | #8 |
Scooby Newbie
Member#: 435611
Join Date: Dec 2015
Chapter/Region:
International
Location: Nairobi
Vehicle:2002 SG5-2.0-XT-JDM 45A, originally 18L |
your easiest bet is as follows
take a boost map off of a good known car. i picked mine from the STI S202/4 and I'm doing 1.4 bar / 20 psi midrange tapering to 1.16 bar / 16.2 psi at 6k redline. take the timing map of the stock map of your car. note that it is map based, not maf/load based but the calculation of load is simple with the VE table. if you'd like, i can post up my excel calculation to help you. it is based off of a certain sheet downloaded from romraider - can't remember who supplied it. then dial in fuel, and timing. zero out the avcs for now as the values in carberry are just bananas!!! |
04-28-2020, 11:29 AM | #9 |
Scooby Specialist
Member#: 111755
Join Date: Apr 2006
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wow, thanks for chiming in! just to update, i have kept at it and been working at carberry. i am still road tuning but its really really dialed in. I went FMIC and have adjusted wgdc and tip in to work around and negate any lag issues. the car runs really really well and sings into 23psi to 5600 rpm, and a taper to 16psi at 6800rpm. timing is 31 degrees at peak load and 25 degrees out to redline. AFR is down to 11.4 at 23psi and down to 11.2 into redline.
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