The Tuning Talk Thread - Forced Induction EFI & JZ Tuning.

[YLD-16L]

i find it absolutely amazing the neg comments about microtechs, i have not had any of the issues you guys describe and i have run a microtech ltx12s since 2002 without a drama.

gold start great
response great
fuel consumption great.

each ecu is only as good as the monkey pushing the buttons

Shane, as the only person I know who would be running the microtech mapped beyond the standard 20psi can you tell me if they add additional mapping points when you upgrade to this feature or do microtech simply spread the existing points further apart?

Edit, I'd also be interested to know how on your car the tuner sets up the idle mixtures, what sort of values did they target? ~14.7 or slightly richer? The microtech does have coarse steps for tuning injector opening time at idle and you run large injectors so I'd be interested to see how this is overcome and "good" mixtures at idle are obtained ,as quite often one injector opening value is marginally lean and promotes hunting, one step longer opening injector time and it's too rich - how do you get that sweet middle value?

Interestingly someone eluded to me to use the % trim as a trick to tune big injectors at idle as that gives you 1% increments of injector opening time to play with, fact is though the ecu will only adjust by the preset opening time values so whilst you may add say 2% fuel it won't add any adjustment until the values reach a point where they tip it into the next preset opening time which may require 10% adjustment i.e. there is no benfit to using the trim function to adjust idle.

Only other ways around it are to adjust the fuel pressure (not ideal) or run smaller injectors (not possible on some setups).........any other tricks or tips???


The above are simply questions, not a dig or anything, I'm not a tuner nor make any claims to be anything of the type. I just like to know how things works and to learn as much as I can about the equipment on my car.

Cheers

Shane.

[YLD-16L]

Are the microtechs lockable?

Lockable with PIN.

[1JZ.747]

Shane, as the only person I know who would be running the microtech mapped beyond the standard 20psi can you tell me if they add additional mapping points when you upgrade to this feature or do microtech simply spread the existing points further apart?

im not sure. i had the 4bar map sensor in the ltx12s, and i believe the new lt16 also has a 4 bar map, not sure if a 5 bar has been sorted yet or if they are actually going to do it


we have gone to 43psi without drama so far, yet to race it with it all in though.

[chris davey]

Shane, as the only person I know who would be running the microtech mapped beyond the standard 20psi can you tell me if they add additional mapping points when you upgrade to this feature or do microtech simply spread the existing points further apart?

I don't think my 3bar equipped lt12s had additional points. Will check tonight for you.

[YLD-16L]

im 99.9% sure additional mapping points. i had the 4bar map sensor in the ltx12s, and i believe the new lt16 also has a 4 bar map, not sure if a 5 bar has been sorted yet or if they are actually going to do it


we have gone to 43psi without drama so far, yet to race it with it all in though.

Cheers Shane.

I have added a few more questions to my above post, be great if you had any input into those.

Cheers.

[1JZ.747]

Shane, as the only person I know who would be running the microtech mapped beyond the standard 20psi can you tell me if they add additional mapping points when you upgrade to this feature or do microtech simply spread the existing points further apart?

Edit, I'd also be interested to know how on your car the tuner sets up the idle mixtures, what sort of values did they target? ~14.7 or slightly richer? The microtech does have coarse steps for tuning injector opening time at idle and you run large injectors so I'd be interested to see how this is overcome and "good" mixtures at idle are obtained ,as quite often one injector opening value is marginally lean and promotes hunting, one step longer opening injector time and it's too rich - how do you get that sweet middle value?

Interestingly someone eluded to me to use the % trim as a trick to tune big injectors at idle as that gives you 1% increments of injector opening time to play with, fact is though the ecu will only adjust by the preset opening time values so whilst you may add say 2% fuel it won't add any adjustment until the values reach a point where they tip it into the next preset opening time which may require 10% adjustment i.e. there is no benfit to using the trim function to adjust idle.

Only other ways around it are to adjust the fuel pressure (not ideal) or run smaller injectors (not possible on some setups).........any other tricks or tips???


The above are simply questions, not a dig or anything, I'm not a tuner nor make any claims to be anything of the type. I just like to know how things works and to learn as much as I can about the equipment on my car.

Cheers

Shane.

honeslty cant answer any of those buddy, im not the guy tuning it and i dont get overly involved in the tuning.

person to ask would be jon from microtech. back when it was first tuned with the microtech he did it. justin then took over when i put the gt51r on on it and the 1000cc injectors.

i know the car never ran an idle air control valve, the TB was opened a miniscule to get it to idle nicely

[YLD-16L]

honeslty cant answer any of those buddy, im not the guy tuning it and i dont get overly involved in the tuning.

person to ask would be jon from microtech. back when it was first tuned with the microtech he did it. justin then took over when i put the gt51r on on it and the 1000cc injectors.

i know the car never ran an idle air control valve, the TB was opened a miniscule to get it to idle nicely

Cheers mate.

[JZA70 R]

i would be very interested to know if microtech did increase map resolution with a pressure sensor upgrade, that would be a nice surprise!

fyi the powerfc is not expandable past the 20x20 resolution, so like you mentioned before, when you upgrade the map sensor or need to increase the load scale you are simply recalculating it.

There are some tricks you can perform if you really are hungry for more resolution in loaded areas...

What i did with the power fc when i upgraded my map sensor to a 3 bar unit is, I worked out the maximum boost my motor would ever see (20psi) and also the maximum vacuum i would encounter on idle or cranking and input those values on a complete linear scale into the powerfc. I turn the injectors off on decel (fuel cut) so there is no point mapping to those vacuum points which also happen to be the highest vacuum the engine will encounter at any time (from what ive logged)

It turns out my maps were previously configured (by default) to run vacuum that the motor would never see so I gained resolution by removing these and adding them to the new averaged scale.

You also have the option to decrease or increase the value gaps between points if you were really hard up for resolution when running 28psi or so you could sacrifice some vacuum tunability for more smaller value gaps betweem points in the boost area of the map.

[thechuckster]

is there much benefit in having fuel maps that are large? the MSExtra has a 16x16 maps which most folks using it find more than adequate.

[JP]

I like to add more resolution at certain points of the map, like boost transition, cruise, max torque etc. With the vipec/link G4 you can simply right-click an axis in any of the maps and enter the new column/row value, then it automatically populates those cells via interpolation on the fly from the adjacent cells. That's one feature I really like.

[1JZ-Rolla]

If only all ECU's were as intuitive hey JP!

Microtech's graduations in the load map (for fuel) have large steps, and doesn't automatically interpolate values between them, most frustrating for those that care about getting an as close to perfect result through the range.

Of course WOT is a different story, but lets face it, this is only a minor part of any tune.... and can be done by a Holley electronic carby from 20 years ago.

[JZA70 R]

mmm interpolation... a life saver. cant imagine tuning without that feature.

[thechuckster]

wtf? no interpolation when running? or just when setting up the columns/rows of VR/Load and rpm ?

[chris davey]

can confirm that my lt12s with 3bar map sensor is 16x16 just like a stock lt12s so no additionaly points, just spread out.

[Disturbed1]

If only all ECU's were as intuitive hey JP!

1200 dollar ems ecus have this feature. can set the column values to whatever u want also