[FinnCobra]

Wife's old car wrecked Easter, and we bought nice -94 improved Thunderbird SC.
Car has following mods at the moment: bigger charger top, ported original blower, large front cooler, larger cooler pipes, stock headers and magnaflow highflow cats and mufflers at tail pipes, larger exhaust. I have 75mm tb but not yet installed, I must port inlet plenum first. Transmission is prepped at dirtydog performance.

Car got rather bad fuel mileage: 20mpg. Prevoius owner has got 26 mpg constantly before mods. I got Derek's def and plugged QH in ecu. I have now datalogs and long trims are quite big at low loads, hp calculation goes wrong big time, car has been dynoed 258 hp, BE shows 378.

Ecu has W4D2 bin code, CZAW0 strategy

Picture link to car pics and dyno test, cooler mods https://picasaweb.google.com/1059913163 ... directlink

[decipha]

whats up fin? nice find, i can only imagine how difficult it is to come by a supercoupe out in finland and you managed 3 !!?

in any case theres a few little tips and tricks you could do to try to squeeze a little more out of it but to be honest, your not going to get much better than whats its getting unless you do something mechanical, i'd expect the fuel economy loss can be directly related to the exhaust, i know my titaniuim 91 dropped from ~28 to ~16 when i put full exhaust on it

[decipha]

oh yeah i forgot to mention, shoot me what you got i'll take a look over it and send it back to you

decipha at efidynotuning dot com

[FinnCobra]

Only 2 SC:s, red one was fully overhauled, repaired body and engine, seats fixed and the painted 3-layer metallic red. It got easily 23 mpg.

I adjusted maf curve and got long trim drop more reasonable. But hp value went overboard too. Transmission shifts weird, rpm rises at shift moment so I adjusted FN34DT table (tv pressure 3-4 shift). It got maybe little better.

[decipha]

fuel is perfect on the gen2 supercoupes, id return it back to stock values and clean the maf element, you probably need new o2s as well

ill post the tune i used to use on my 95 auto when i get a chance

[FinnCobra]

Maf is replaced july-09, o2 sensors august -09, roughly driven 10 tml. I know they could be bad, but o2 sensors switch fast, and maf voltage rises enough (4.65V) but doesn't get pegged. I just thought that airflow has improved, exhaust not restricting and maf curve couldn't keep up.

[decipha]

4.65 is pegged

exhaust may not be restrictive enough, thats what killed my fuel economy

heres the tune i used to run when my purple 95 auto was still stock, she was making about ~15lbs of boost, this was my 87 octane tune so timing is a tad low and i had her in forced open loop because my hegos were originals and it made no sense to replace them since the fuel was perfect

this will solve your shift issue, also i had aftermarket wheels on her so the nv and shift points have been slightly adjusted, it should be perfectly fine for a bone stock supercoupe though

just in case you want to go into closed loop, shes forcing open loop by fn338 being maxed

[FinnCobra]

I have low pressure meter, I can measure exhaust backpressure. Any idea how much is good value?

[decipha]

she should be sitting at around 1psi at idle and should be in the 2-3 range at steady cruise

[FinnCobra]

Tested your bin, shifting improved but some fixing there is, maybe there is problem in transmission too. Way too much to adjustable parameters
Engine runs ok, I opened adjustables, long trim goes near 25 again. HP value is closer, only 100 hp too much

[decipha]

u think thats alot changed? you've obviously never seen a true tune lol, that vehicle is otherwise stock only fixed what henry screwed up

hp is actual at crank

u prob have trans issues

[FinnCobra]

I checked what parameters the are to adjust transmission, many... I have repaired transmissions at work, and know how they work electrically and hydraulics. But it surprised me how much does -94 eec-4 box control it.

[decipha]

They are simple once u figure out whats doing what, what is the trans doing?

[FinnCobra]

It lets rpm rise between shifts and shifting is slow. It's my wife's car, I have more accurate knowledge when I got to drive it tomorrow. Shifting is better with your tune but engine isn't smooth.

[decipha]

does it still have the stock replacement meter and 36 lb injectors? what grade quality fuel are you using in finland ?


check the ignition switch, if its loose replace it, when the ignition switch has poor conductivity the first system it hits is thw ircm feed which will in turn give reduced power to the hego heater, maf, fuel pump, and transmission. This sounds almost like what u got going on.

if all checks out good then its time to tune, start by dialing in the maf then ucan dial in the trans, sounds like you need to up the forward stall to get more line pressure, log converter ratio to see how much its slipping

[FinnCobra]

Engine is now dismantled, 3 pistons broken between compression rings. Block will be bored to next oversize, new Sealed Power cast pistons. Knock sensor shows knocking when driving but ignition don't go to retard mode. Knock can be mechanical, from broken pistons.
Failure could be caused by detonation or overboost. Charger is original, with std ratio. Pressure is not larger, but big cooler adds more air mass.

[FinnCobra]

Can anyone explain me CZAW0 knock strategy, I have knock detect from flag5, bit 0 in my dashboard, and it shows easily knocking when accelerating. In log file knock detected are both 0 but knock enabled varies from 0 or 1. Engine had 3 broken pistons before reboring, and I wish it stays all right.

I swapped stock turbine converter and now transmission overheats, it had top temperature amost 260F. Car drives allmost all right and converter lock is in order but ecu doesn't lock it allways. 3-4 shift is hard, almost like hammer to chassis. I cleaned valve body completely, and one piston had minor scrathes that I fixed. J-mod has been done, and I checked it too.

[decipha]

make sure knock control is allowed in that load range you are getting it there is scalars for it

260 tot's is bound to cause trans failure in due time

i actually posted about this exact thing earlier tv pressure is calculated by the tq table, if you revamp your maf or have an engine thats more stout than stock youll have to dial that table in else your tv pressure will go ape shit

i dont waste my time wih the table instead i set the fn616 sw OVERIDE scalar and adjust the stall forward function accordingly, the downfall is that you loose shift pressure adjustment from the dynamic ahift functions, you also loose the tv pressure clip scalars as well but you dont have to worry about pressure differentiations as its only based on throttle position

tv pressure at wot is only 70 on a bone stock supercoupe

i currently have my stall forward function fn616 like this:

5.1 85
1.5 70
1.32 66
1.0 45
.56 32
.1 20
0.0 4

[FinnCobra]

lowered knock limit to 20 load. Knock mode is not enabled anytime according to flag5. Bit 0 stays 1, showing knock detected allmost alltime. I tuned global spark to -10, no effect. Is the knock sensing in this ecu any good, or could it detct false from mechanical noise. Rockers were little worn, but engine noise in idle is low, charger sound is loud.
I checked ignition with stroboscope, spout disconnected it was 10 sharp.

[FinnCobra]

I got 4-3 shift better, but tot is too high, raises to 228F. No reason for that, converter locks ok, ect 210, transcooler is air to air, no through coolant, and shifts are ok.

[decipha]

it doesnt take much for it to detect knock anything loose or noisey will do it

most disable it

[EDS50]

I would look into a better trans cooler.

[FinnCobra]

Now transmission is much better. Std valve body and 2-3 spring softer, missing OD spring installed. Different cooler in better location, no temperature problems.

[EDS50]

Now transmission is much better. Std valve body and 2-3 spring softer, missing OD spring installed. Different cooler in better location, no temperature problems.

Glad to hear your making progress.

[FinnCobra]

I swapped plugs and wires, and same time swapped lightning maf. I got some transfer from EA and test drived. Adjusted leaner by log about 12%. Could drive but and idle but badly. Maf autotune helped little but always ended losing idle. At the end of test drive exhaust smoke got blue. Long trims varies from left to right -5 vs +15, I maybe broke something. I put back original maf and earlier bin, but it doesn´t run like before. Now I have little motivation problems, soon I start to put stock parts back.

[decipha]

that sucks, why didn't you go with forged pistons? i could have gave you a hell of a deal on some forged custom autotec pistons with any specs you wanted for our supercoupe engines at next to nothing... live and learn at least you know for "next time"?

blue smoke=not good

[EDS50]

Dont throw in the towel and give up. Stick with it. Like mike said...live and learn and move on no matter how frustrating it is. We have all been there. Its the nature of the beast.

[FinnCobra]

it's only dd, but previous owner had swapped ic and exhaust. Car is simply too easy to get power and something always is the weak part. It isn't cheap car to maintain and use in Finland, and ecu tuning is something I can't ask anybody, they ask me.

[FinnCobra]

I put stock maf back, and have tuned a lot. I think almost everything is now fine except fuel mileage and first start with cold engine, it stalls when put to D and normal try to get moving. I adjusted little base table richer. I must test it again when engine is cold.
Could someone share values when cruising 55-60 , TPS, MAFV, InjPW, loads. I try to figure if something is wrong with trans, and causes high fuel consumption. Maybe not, trans temp is low when cruising.
Car has 3.27 lsd.

[FinnCobra]

Weather got colder, now engine has stumble when ect is very low. When accelerating from full stop, engine stalls if half or more throttle. I lasts only few miles, but more than 30 sec, so startup table isnt cure ?