ST170ish

EEC-IV whats the go with this set up on the efi302's(XH1998)can I change the cam/springs/rockers without to much trouble.Are they really self learning or will I need a chip?How far could I go with the standed AOD trans before it needs to be beefed up?Who in adelaide SA would be the best to get this work done?

XR8chic

Hi,

Are you sure you have a EEC 4?? (your car should have the EEC 5)

The EEC5 will handle these mods a little better than a EEC4. (the EEC4 will not like this AT ALL - it does NOT learn)

I recently got these same mods (plus a few extra) done to my ED XR8 (EEC 4 + Unichip) and the car would not run right until I got the Unichip retuned. (Stalling, backfiring, hunting at idle etc etc)

One of the guys in the club also got similar mods to his EL XR8 (EEC 5) that would not run quite right either.. He eventually got a GT computer for his car, and now its running sweet.

Your best bet would be to get a reprogrammable chip (such as the Unichip) before you get these mods.

__________________
FPV - Tickford Club of NSW
http://www.fpvclub.com

LTDHO

I put a Unitorque in mine (EE4) and it didn't help at all. She runs the same with or without it. I even when as far as sending the computer thto them with a detailed list of mod's and still nothing.

I'm gunna wait untill I've finished playing. Probably get another one.

XR8chic

I think thats where a real time reprogrammable chip will come in handy.

Chiptorque 'reprogrammable' chips arent really suited to a individual car. They are programmed based on the type of mods have (and assumming all engines are the same, and all cams are the same, and all roller rockers are the same.....)

Unichips are pretty good. They are programmed while the car is on the dyno. I watched mine get programmed by the guys at corydon autosports the other week. 2.5 hours on the dyno!! They where holding the revs at a certain point, adjusting the air and fuel ratios to get the best responce, and then taking it up another 200 revs and doing it over again!!

I know the Unichip is a bit more expensive than other chips (about the $1000 mark) but in my opinion its worth it, cos you can keep the chip through ALL the mods you get!!

__________________
FPV - Tickford Club of NSW
http://www.fpvclub.com

Mr GTHO

Rolfy72, are you sure you have an AOD gearbox? The AOD is usually found behind US 302's.
XR8Chic & LTDHO, I'm surprised to hear about the EEC-IV is harder to tune. The EEC-V has OB-II which should be less friendly as it has more emissions calibrations than EEC-IV.
In the US, EEC-IV was being used right up till the introduction of the 4.6 which uses EEC-V. I know that certain EEC-IV modules were better for performance than other IV's. I forget the IV ID number but there was an EEC-IV module than hardly pulled out any timing during gear shifts and tuners made very good power from it. The EEC's are programmed to pull out timing during gearshifts so not to shock load the transmission too much. It is very hard to alter this programming unless you have access to EPEC or the new Flash EPROMS used in current modular V8 EEC.

ST170ish

MrGTHO its got the standard 4sp auto(I thought they were AOD's)XR8chic it is EEc5! sorry.So whats the story when people say about the self learning mode?

discokin6

Whats the lowdown with the Wolf3D computer system? would it be cheaper in the long run to yank the inflexible EEEC system in favour for the Wolf computer?

I guess it'd take a LOT of programming, but if you change the TB or springs or cam it'd be easier to go back and rewrite the ROM than to yank the chip, wait a few days with the baby in the shed while these guys re-write the chip..

just a thought :)

ozrunner

Not sure where some of you are getting your info from but the EEC-IV MAF system has the cabability to easily handle a huge number of changes such as cams, bigger TB's etc etc and make some serious HP numbers without the need to do any reprogramming. The appropriate sensors will read the changes and make adjustments accordingly.

AusXH

Are you sure it's EEC5. My XH is a 97 I-6 and it has EECIV. Or don't tell me that the 8's get the 5 and the 6's get the IV.

Mr GTHO

Rolfy72, I wouldn't actually say self-learning. The EEC will still make the calls even if you do changes to the engine. But this depends on a few things. The relationship between injector size and mass air sensor controls the whole EEC. When the engine leaves the factory the 5.0 has 19pound injectors and a 65(?)mm mass air sensor. If you do some changes to the injector and fit 24 pound injectors the mass air sensor will read more air flow and the EEC will tell the injector to dump more fuel. Being a bigger injector than what the EEC thinks it is too much fuel will enter the combustion chamber resulting in a too rich reading in the O2 sensor. The EEC will check it's tables and think to lean out the mix by closing the injector a bit faster. This is where the problems start because in the EEC system there is the standard factory settings which it reads from and compares to the current engine settings. It has in built allowances for engine degradation as the engine gets on in years. Because the injector:mas ratio is wrong the EEC wrong s wrong and the engine behaves so.
This is a very simple explanation because there are many other decisions made by the EEC. You have to remember that most of the EEC operations is for emissions control not performance. I used to have a list of what MAS goes with each injector size somewhere. I'll have to dig it up and post it.