Mega Squirt II

[4sfed]

Any one had any luck?? We have it on a turbo truck and the main thing I do not like about it is that there are not enough load points so tuning drivability sucks. Seems like it would be a good deal for a race car or something that does not street drive alot.

[MadmaX]

Any one had any luck?? We have it on a turbo truck and the main thing I do not like about it is that there are not enough load points so tuning drivability sucks. Seems like it would be a good deal for a race car or something that does not street drive alot.

How many load points do you want? MSI was worse.

[4sfed]

My Haltech has 32X32. On this truck it sucks because it has a 4 spd auto and there are alot of overlapping load points that make drivability tuning suck. We have a FAST we are going to put on it but I was curious for some input.

[bimmerjim®]

base ms code is 8x8, msns extra code has 16x16, MSII or MSI... just depends on your firmware. on some msns extra codes you can run dual maps, efectively giving you a 32x32 resolution. but, iv never found a need for anything more specific than 16x16.

if your having dirvability issues, most likely its due to improper tuning in accell/decell enrichment, warmup enrichment, or ego correction is to aggressive.

[4sfed]

base ms code is 8x8, msns extra code has 16x16, MSII or MSI... just depends on your firmware. on some msns extra codes you can run dual maps, efectively giving you a 32x32 resolution. but, iv never found a need for anything more specific than 16x16.

if your having dirvability issues, most likely its due to improper tuning in accell/decell enrichment, warmup enrichment, or ego correction is to aggressive.

If anything I think we could change the load points around but you can drive the truck and see that it uses the same load points for different driving conditions. I.E. cruising in 2nd gear light throttle and cruising in 4th gear with the converter locked light throttle. If I remember it is a 12X12 and we are using over half for vacuum. It just seems to me that there are not enough points that we could get a good spread so there are no overlaps.

[bimmerjim®]

If anything I think we could change the load points around but you can drive the truck and see that it uses the same load points for different driving conditions. I.E. cruising in 2nd gear light throttle and cruising in 4th gear with the converter locked light throttle. If I remember it is a 12X12 and we are using over half for vacuum. It just seems to me that there are not enough points that we could get a good spread so there are no overlaps.

well, i dont plan on being in nebraska for a while...

do you have any datalogs you could upload?

you should be able to get it evened out on a 12x12. actauly, iv been using 12x12 for years. sor some reason i thought iv been using 16x16.. huh.. anyways, i know iv seen the 16x16 code avalable for MSII ecu's, but iv never needed to use it. maybe for a bike, or something that revs to the moon..

i had a hard time at first getting the drivability ironed out.. you mentioned that your using half vacuum, do you mean your running a mix of TPS and MAP for accell enrichment?

try using only TPS for accell and decell enrichment, turn ego correction down to 16 ignition events per step, and controller step % to 1. make ego correction active only above 1800 rpm.

also, move some of your ve pointes to the range that your having issues, (most likely the torque peak) then space out the other points to compensate.

[JesterMX6]

holy crap i'm lost.


what am i getting myself into.












jim how much are plane tickets to lincoln. i'm flying ur ass down here when i'm ready to tune my car :lol:

[bimmerjim®]

hah! about 350 for a round trip ticket. ;)

its actually pretty easy, its just a bunch of terms to remember. just get on the msefi site, or on megasquirt.com and read read read till your eyes bleed, then read some more. once you start messing with it, its gets really easy really quick.

[88alltrac]

i have never messed with it myself but i know the guys on alltrac.net dont like it to well because they want better resolution when tuning boost.
thats all i know.

[JesterMX6]

hah! about 350 for a round trip ticket. ;)

its actually pretty easy, its just a bunch of terms to remember. just get on the msefi site, or on megasquirt.com and read read read till your eyes bleed, then read some more. once you start messing with it, its gets really easy really quick.

yeah. i think the problem i'm having now is that i'm reading but have nowhere to put it to application. once i get the ECU installed it'll be a different story.

[4sfed]

well, i dont plan on being in nebraska for a while...

do you have any datalogs you could upload?

you should be able to get it evened out on a 12x12. actauly, iv been using 12x12 for years. sor some reason i thought iv been using 16x16.. huh.. anyways, i know iv seen the 16x16 code avalable for MSII ecu's, but iv never needed to use it. maybe for a bike, or something that revs to the moon..

i had a hard time at first getting the drivability ironed out.. you mentioned that your using half vacuum, do you mean your running a mix of TPS and MAP for accell enrichment?

try using only TPS for accell and decell enrichment, turn ego correction down to 16 ignition events per step, and controller step % to 1. make ego correction active only above 1800 rpm.

also, move some of your ve pointes to the range that your having issues, (most likely the torque peak) then space out the other points to compensate.

What I ment by half vacuum was on the 12X12 VE table we have over half of it set up for non boost. 0-100 KPA. We have EGO correction turned off because it was causing issue in the area's of overlap(the VE table where it wants to use the same load point for 2 different driving conditions)
When your in town I would love to chat in person and maybe show you some logs and the program.

On a side note the truck runs hard at WOT. I really like the auto correction VS a/f when data logging. I wish my haltech did that.

[bimmerjim®]

well, im sure you know this... but, just because the scale will let you go up to 255 kpa, does not mean you need to use that whole thing.

my ve points are (in kpa) 28 30 40 50 70 85 100 140 180 200 220 230,
(in rpm) are 400 800 1200 1600 2000 2400 3200 4200 4800 5400 6800 7000

so, you can probaly see i have points close together where i have off idle, crusing rpm, spool up rpm, and full boost rpm. after full boost rpm, fuel and spark level off, or make vary minor changes. so theres no need for high resolution. i have a closed gaped 6800-7000 to add a bunch of fuel and retard timing a whole lot as a safety measure. same thing for the close gaped 220 to 230 kpa.

im still pretty sure that your driveability issues are a problem with excel or decel enrichments..

unless... are you still using your factory ecu for spark?

please try getting some datalogs uploaded if you can, or at least some scree shots of your ve maps, ego settings, warm up enrichments, and excel decel tables. if you could do that, i can tell you exactly whats wrong.

[Jasen]

:bowdown:

[4sfed]

well, im sure you know this... but, just because the scale will let you go up to 255 kpa, does not mean you need to use that whole thing.

my ve points are (in kpa) 28 30 40 50 70 85 100 140 180 200 220 230,
(in rpm) are 400 800 1200 1600 2000 2400 3200 4200 4800 5400 6800 7000

so, you can probaly see i have points close together where i have off idle, crusing rpm, spool up rpm, and full boost rpm. after full boost rpm, fuel and spark level off, or make vary minor changes. so theres no need for high resolution. i have a closed gaped 6800-7000 to add a bunch of fuel and retard timing a whole lot as a safety measure. same thing for the close gaped 220 to 230 kpa.

im still pretty sure that your driveability issues are a problem with excel or decel enrichments..

unless... are you still using your factory ecu for spark?

please try getting some datalogs uploaded if you can, or at least some scree shots of your ve maps, ego settings, warm up enrichments, and excel decel tables. if you could do that, i can tell you exactly whats wrong.

The next time the truck is here I will get some data logs and upload them. I will also see if I can get some screen shots of some maps sooner.

[MadmaX]

can somebody explain the point of having acceleration enrichment corrections based on the map on a speed density setup?

should be tps based only imo.

[bimmerjim®]

with MSII you can blend a percentage of TPS and MAP for making acceleration and deceleration, iv got mine set to use 75% tps based, and 25% map.. the reason i use map at all is there are certain times when your holding throttle, lets say 50% throttle in second gear starting from 2000 rpm. and your accelerating, ...at 3500 rpm the turbo spools, and suddenly you have allot more air without changing your throttle position.

thats the only time i can see using MAP based corrections...

[MadmaX]

but the beauty of a tps based enrichment is that the MS gets the signal before the map sensor has a chance to notice a difference in load. see where I'm going with that?

[bimmerjim®]

exactly. tps as always way faster than MAP, and in the same way, a MAP sensor is still way faster to react than a MAF sensor... but its really a difference of hundreds of a second.

thats why i primarily use TPS for enrichment calculations. on an NA, supercharged or nitrous car i wouldn't use any MAP to calculate enrichments. TPS only.

[swaggy853]

I like the sound of this, I wanna play with MS now.

[4sfed]

I really was excited about using it on the turbo truck. However after using it and then other systems. FAST, Haltech, etc it was faster to get the other systems up and running. Now that we have done a MS I dont think it would be near as bad. I'm sure Bimmerjim could get one running pretty fast because he has done alot more of them.
I am still not sold on the 12X12 map. Maybe we can get that situation figured out and I may try another one.????

[swaggy853]

I have only played with honda stuff, I need to branch out.