People who attended the RS Motors Dyno day, FYI!

RiftsWRX · Oct 11, 2004

http://forums.nasioc.com/forums/showthread.php?t=645472

If you have the means to contribute feel free to add to that post, if not please post any concerns here so I can do what I can to help you guys out while this is addressed.

Musashi · Oct 11, 2004

COOL!

DISCOPOPE · Oct 11, 2004

i'm a little dumb when it comes to tuning, but if the problem boils down to an over worked maf sensor what is the solution?
perrin big maf?

Zola · Oct 11, 2004

**** Jorge, you're running into a tough crowd in that thread!

RiftsWRX · Oct 12, 2004

Yeah. I'm trying to NOT have you guys need to tweak and/or change your maps for different weather. IMO that defeats the purpose.

I feel like I'm loosing here though. So I at least am trying to do the responsible thing by letting you guys know what's up before someone has a problem.

Perhaps if people went on their and vocalized their requests for a more robust system, they'd be inclined to oblige.

bikerboy · Oct 12, 2004

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by RiftsWRX

Perhaps if people went on their and vocalized their requests for a more robust system, they'd be inclined to oblige.
<hr height="1" noshade id="quote"></blockquote id="quote">

Yeah right with the di$k swinging going on there I dont see Nathan helping.

Cough hydra cough

bikerboy · Oct 12, 2004

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by DISCOPOPE

i'm a little dumb when it comes to tuning, but if the problem boils down to an over worked maf sensor what is the solution?
perrin big maf?
<hr height="1" noshade id="quote"></blockquote id="quote">

Yes and No

Yes the peak voltage at a given gr/sec will go down

the problem is you set boost for say 15 psi 300gr/sec at 75 degrees. Now the temp goes down to 50 degrees and you have 350 gr/sec at 15 psi since the air is denser.

Does that help?

RiftsWRX · Oct 12, 2004

Exactly. What Nathan is basically telling you/I is that we need to "detune" your car, which still won't deal with the background map dwell. But if they're not willing to help us, we really don't have a choice but to detune, or setup a winterized type map for you.

ugh.

bikerboy · Oct 12, 2004

LOL up the creek.

So that still does not help on the issue when I went to the fail safe map with wastegate preasure and I still get the knock.

**** 100 oct is getting expensive

DISCOPOPE · Oct 12, 2004

so current solution should be big maf and a cold weather map?
if you added fuel and are still getting the knock events does that not support nathan's view on the overworked maf sensor?

i do agree that should be a better way to handle this than having to reload a set of maps twice a year.
am i correct in thinking there is there currently no way to use a intake temp sensor to alter openloop fueling?

Zola · Oct 12, 2004

You can currently alter the fueling based on IAT exceeding a set value in the parameters, i.e. when you are getting heat soaked in stop and go traffic.

So that's a high temp correction, but there's no corresponding cold temp correction.

bikerboy · Oct 12, 2004

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by DISCOPOPE

so current solution should be big maf and a cold weather map?
if you added fuel and are still getting the knock events does that not support nathan's view on the overworked maf sensor?

i do agree that should be a better way to handle this than having to reload a set of maps twice a year.
am i correct in thinking there is there currently no way to use a intake temp sensor to alter openloop fueling?
<hr height="1" noshade id="quote"></blockquote id="quote">

The reason that the big MAF is used is if you are maxing out the voltage ie 4.9-5.0V on a consistant basis. The big MAF lowers the voltage for the same gr/sec of charge.

say 300 gr/sec is 4.9V

large MAF with 300 gr/sec would be 4.0V

As Joel said you have a hot correction but no cold

RiftsWRX · Oct 12, 2004

and the inverse of the problem is that if I use the correction algorithm to handle the cold weather, there is no hot weather, so again, it's one compromise after another. Either we're swapping maps fall/spring, or we're swapping settings for the corrections fall/spring.

DISCOPOPE · Oct 13, 2004

ah, ok i see. thank you for the explaination and for being patient with my questions.

so with the maf what we really need is a sensor that can handle a wider range of flow, not just shifting the entire range up via a larger tube. karman vortec?

there is alot more info in that nasioc thread that i didnt read before today.

bikerboy · Oct 13, 2004

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by DISCOPOPE

ah, ok i see. thank you for the explaination and for being patient with my questions.

so with the maf what we really need is a sensor that can handle a wider range of flow, not just shifting the entire range up via a larger tube. karman vortec?

there is alot more info in that nasioc thread that i didnt read before today.

<hr height="1" noshade id="quote"></blockquote id="quote">

Well there is a wish list thread in the EM forum that is where we are putting what we want.

The real problem is that we see days where we have 40-50 swings in temp. Unfortuniately we only get corrections in one direction when we need them in both at a minumum.

You should look at the Thread listed above as I added some logs.

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People who attended the RS Motors Dyno day, FYI!

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