Question for those of us running a 9653 rom or I guess any other rom for that matter I suppose. Now that I have my talon up and running, I have started going back through my rom again and was trying to get my AFR's in check. So I opened up my rom and went into the Periphery bits to set up a rom to stay in open loop (just so I can check my injector scaling) and I noticed in the most recent XML I downloaded FAA bit 10 is labeled "Timing knockdown on light acceleration and less than 3000rpm". This bit apparently is disabled from the factory (or at least on my rom it was) and I am wondering if anyone has any idea what effects this will have on the tune, how much timing it pulls assuming it is pulling timing and not adding to? I will ask on EvoM as well to see what they say...


Edit...
Never mind, I found my answer by doing some digging around on EvoM... Guess you tend to forget what things do when you don't mess around with them for over a year. But just in case someone else wants to know and hasn't done the digging themselves yet, it causes the ECU to pull anywhere form 3 - 8* of timing under light acceleration below 3K rpm. Apparently in some other roms it is active and evo owners are turning this bit off so that they can get their timing to actually match what they want their timing map to be. It is still unclear on EvoM if it is related to the lean spool function on the ROM or not, from what I have read they have been able to figure out what it does and have stopped researching it there...

Mork, I have a question for you... Sense your post a year ago when you put up your ROM with your initial SD settings has anything changed on your car, according to your profile anyway? If things have changed that effected the tune what was on your car when you swapped to SD. I was thinking about trying to finally go SD once I get my car back up and running because I am having some difficulties with getting the EVO8 ECU to tune my MAF, seems like none of the changes I make do anything so I was going to use your ROM as a starting point and figured it would be a good idea to know how much of a difference there is in the car before I just throw a ROM in the ECU and try running with it...

i am thinking of putting an evo 8 ecu in and was wondering if i can run a maf translator to get a base tune, and then fine tune with the evo ecu? or what i can do to run both the evo8 ecu and the maf-t.

What do you currently have in your car that would make you want to run both an EVO8 ecu and a MAFT?

Mike, did you ever try that AC 12volt pin thing out for idle issues with AC?

97gst_spyder said:

Mike, did you ever try that AC 12volt pin thing out for idle issues with AC?

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What thing is that? Im trying to deal with some idle issues on my 1g and the ISCV tables dont seem to be cutting it. Only stalls with ac on. Really annoying.

Would be sweet if there was a way for it to cut the ac compressor off for a split second while rpms's drop to idle, then re-engage it.

You can't run the GM maf, without a translator. If you have a translator your back to square one when it comes to your base map. So in other words, pick up a 2g maf to work with to get your base map squared away.

97gst_spyder said:

Mike, did you ever try that AC 12volt pin thing out for idle issues with AC?

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Sorry no i haven't yet. My car is back down for repairs, I had a bad ignition problem that was causing the car to not run correct and now I am trying to figure out why my car is running so lean and won't cycle out of open loop. not to mention that i still haven't put the AC belt back on my car yet so I haven't had the system servised...

H82lose91 said:

What thing is that? I'm trying to deal with some idle issues on my 1g and the ISCV tables don't seem to be cutting it. Only stalls with ac on. Really annoying.

Would be sweet if there was a way for it to cut the ac compressor off for a split second while rpms's drop to idle, then re-engage it.

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I had found in the EVO service manual where that there is an extra wire ran from the AC computer to the ECU that I believe has to do with idle function. The plan was once I had my car back on the road and had the AC serviced I was going to test it out and see if it helped with the idle drop when the AC was on.

i have a translator, 3in gm maf, 660 denso's, an intake, ebay front mount, mhi 16g, catback. i was looking into the next step with everything, and i didn't know if i could still use the translator with the ecu or not, and was just trying to get info on everything before i buy things.

mitsukid124 said:

i have a translator, 3in gm maf, 660 denso's, an intake, ebay front mount, mhi 16g, catback. i was looking into the next step with everything, and i didn't know if i could still use the translator with the ecu or not, and was just trying to get info on everything before i buy things.

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You didn't have any of that listed in your profile so I wasn't sure if you had it or were planing on installing it along with an EVO8 ECU, thats why I asked... Yes you can, I ran a Translator gen2 for a bit when I first installed my EVO ecu, but I hope you have it set good now or you could be chasing your tail with tuning.

Id ditch the translator and get things setup with the evo maf first, then move over to speed density. I really see no benefit of using a translator with the Evo ecu, minus moving the maf up stream.

yeah right now i have it pretty much dead on, but theres a few small spots when im driving that go a little lean and i bog down. also if i decide to load one of the stock evo tunes instead is there one my car would be more compatible with or would they all be about the same since im going to have to adjust them anyway?

They are all going to be about the same because you will need to adjust all of them for your car... However, I would recommend the 9653 ROM. It is the most widely accepted ROM for use with the USDM EVO8 ECU. There are others that work (9055) but they aren't supported by the most recent Tephra mod or speed density when you are ready to step up to those functions. and the ROM that comes on most USDM ECU's has an issue with CEL for both CAM and Crank sensor's that with no amount of turning Periphery bits off will fix, it is more of an annoyance than will keep you from passing smog than anything else.

Id also suggest 9653. And until they work out the jitter on the SD 2.0 id go with 96531706. Also the xml's for the tephra rom's may not have the absolute latest table definitions, so if you find your self reading a thread and cant find the table they are referring to, it may have been redefined and not updated in the xml's. ISCV tables are one of those.

mike96 said:

Mork, I have a question for you... Sense your post a year ago when you put up your ROM with your initial SD settings has anything changed on your car, according to your profile anyway? If things have changed that effected the tune what was on your car when you swapped to SD. I was thinking about trying to finally go SD once I get my car back up and running because I am having some difficulties with getting the EVO8 ECU to tune my MAF, seems like none of the changes I make do anything so I was going to use your ROM as a starting point and figured it would be a good idea to know how much of a difference there is in the car before I just throw a ROM in the ECU and try running with it...

Click to expand...

The car is mostly the same in terms of things that would affect VE. Don't expect to be able to get into boost (safely) based on those values but the car should run unless your setup is hugely different. That said setting it up from scratch would probably be just as easy.

ok cool, i'll deffinately keep that in mind, cause selling the maft would give me cash to play with. thanks for the imput everyone, it's greatly appreciated.

the_mork said:

The car is mostly the same in terms of things that would affect VE. Don't expect to be able to get into boost (safely) based on those values but the car should run unless your setup is hugely different. That said setting it up from scratch would probably be just as easy.

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I wont expect to get into boost anytime soon whether or not I go speed density or not. I Currently have it apart again. Still trying to track down the whole misfire/stutter thing I had a couple of weeks ago. I think there was a combination of a bad ground a broken wire and who knows what else. But the last time I tried running the car I put it on the MAF Tephra V7 and the ECU was running lean (in the 18's) and wouldn't come out of open loop.... So while it is apart I am practicing my shitty welding techniques and am re-doing my I.C. tubing. Should have it back together tomorrow I hope.

So any updates from anyone running one of these ecu's? I ended up tuning my car a few weeks ago running the 9653 variant 3D SD setup and it went pretty good for a base tune.

Yea. A lot of us are using this ecu with the 9653 Rom and are loving it.

mike96 said:

Yea. A lot of us are using this ecu with the 9653 Rom and are loving it.

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yep. While im not on the 3d sd maps, i am on the SD tune w/ the omni map sensor and loving it. Ive put about 5k miles on the car since i put it in, and that includes cross country trips (well, 1300 miles from NY to Hot Springs Arkansas) and i had no issues at all.

Im very glad i chose the evo ecu over link....and ive also converted a few more people to it that love it.

I'm not running an Evo 8 ecu any more, but I am running SD on a 98/99 ecu. The 3D VE maps seemed to help even out the tune on that ecu too. The 3D SD mapped 9653 rom came out less than a month after I switched ecus. Go figure.

does any one have the diagrams and pictures since they arent working any longer?

Edit never mind it was my pc got them to download correctly from Pg.2

Has anyone run the Evo 8 ecu with an auto? Does anything need to be changed? Wires or values?

I ran it on my car, which is an auto. There's a couple wires from the 2g that are labeled in the diagram and are unused when you swap.

No values were swapped.

Ok, thanks!!