Some say that the MAF tables in the ARAP code are superior than other versions found in 1227165 ecms, so my question is, would if be safe to try running an ARAP chip with a Supercharger installed in the car?

Of course I have copied the spark tables from my original ANYJ code because running the stock ARAP spark tables would kill the engine in no time at all, but are there any other pitfalls that I need to be aware of?

 

Under full boost your gonna be in WOT land. Most of your maf table is useless under boost.


-- Joe

 

I allready know that, and use a FMU for fuel encrichment under boost. But the reason for wanting to use the ARAP code is that the MAF tables are supposed to be better than in older code versions.

Thats why I want to know if I am safe by using the spark tables from my original ANYJ code.....

 

Your safe using the maf + even some of the spark. Tuning $8D always kinda pissed me off with the blower, though.

At one point tpi_roc made a arap bin importing aujn timing. Didn't work very good on a stick though.

-- Joe

 

all lies the maf tables are the same across all 165 ecms that use maf.

arap is way more spark then i would ever run on a forced induction car

yeah like the fact that cylinder pressure has no factor on flow reading coming from the maf so timing advance retard will be way out in left field even when you think its good. just get a 2bar map a 730 repin for the syty and run syty $58 code.your pistons will thank you

 

Sean, your blanket statement is misleading. The value entries withing the various MAF Scalar tables for the ARAP are different. It works the same as other $6E, but the values are different than other $6E values.

ZaphodB, do a Binary Compare of a variety of $6E bins on the various MAF Scalar Tables if you wish to see the differences. In fact, try a couple.

FYI, I HAVE tested the various MAF Scalar Tables from various $6E bins on a number of 1989 MAF cars (with different engine combos). The ARAP consistently came the closest to giving 128/128 in part throttle driving under various conditions.

I also found the spark tables were too aggressive and needed to be toned down.

 

i think your over reading the issue. the transfer function of all the MAF 165 and 870 ecms is the same. they use the same sensor calibrated in the same manor. the issue you are reffering to is the way in which they handle for FPR correction by changing the scallers in which they define the transfer function values table to table. its a farse however considering that the basic element of the table will always have to be either the same or extremly close. there is nothing special about $6e or arap for that matter aside from pe fuel and the vettes aluminum heads wanting more spark. start comparing the actually transfer function values of each code from code to code. they are all pretty much the same.

 

I did a few experiments during the weekend, with the ARAP code, but with all spark tables copied from ANYJ code (original), and found out that it worked better, got rid of some small knock retard in the high rpm range (3200-4800).

So I'd agree with you on that, MAF tables in ARAP are better, although I still have some more work to do.

 

its not the maf tables. its agian differences in pe ae fueling .

 

That's what I found after a lot of real world testing. After trying MANY different base bins with the $6E, I have found the ARAP gave the more consistent fueling with the least amount of tweaking (for fueling). And this is on a range of engines from 230HP 305s to 500HP 383s.

Inspite of what some individuals claim, I never said "You CANNOT adjust the MAF tables". I've always said that using the ARAP Bin comes the closest with the LEAST amount of tweaking require necessary.

This is ALL for part throttle. Once you get into boost and max the MAF, you then enter new tuning issues. If you are not in PE yet the boost is maxing the MAF (a distict possibility), you then have some challenges to tuning. The O2 sensor will compensate, but don't be surprised if your BLMs go lean. This is why many guys use an FMU.

When in PE, you can use the PE tables to add the extra fuel needed. In fact, you may find it preferable to engage PE sooner to avoid the part-throttle/max MAF/lean O2 reading.