Just did a speed density tune
03-02-2016, 03:48 PM
#1
Just did a speed density tune
Hey guys just did a speed density tune on my z06 and wow the difference is amazing
It so smooth now, drives really good and has almost zero lumpiness from cam
BTR stage 3 / msd / nw102 headers cat less mids /
Wish I had done this ages ago, it was so jerky before now it's perfect
It so smooth now, drives really good and has almost zero lumpiness from cam
BTR stage 3 / msd / nw102 headers cat less mids /
Wish I had done this ages ago, it was so jerky before now it's perfect
03-06-2016, 09:41 PM
#4
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St. Jude Donor '15
HP Tuners or EFI Live I'm sure. Yeah, SD is typically smoother... most people think theirs is fine until they switch to SD and it's quite a bit smoother in most cases
Last edited by schpenxel; 03-06-2016 at 09:42 PM.
03-07-2016, 05:15 PM
#6
Team Owner
Swapped over a few months ago. Amazing isnt' it? Soooo much better.
Just be careful with weather changes until you can monitor in all conditions.
Just be careful with weather changes until you can monitor in all conditions.
03-07-2016, 10:33 PM
#7
Originally Posted by Unreal
Swapped over a few months ago. Amazing isnt' it? Soooo much better.
Just be careful with weather changes until you can monitor in all conditions.
Just be careful with weather changes until you can monitor in all conditions.
03-12-2016, 07:53 AM
#8
Drifting
I have been reading about this speed density tune but isnt this taking a step backwards in technology? It is my understanding that the factory used to use speed density for the early fuel injected vehicles then the switch to the maf or current engine management as an improvement. Not only for emissions but several factors.
On the other hand, my car feels so-so especially off idle stumble to the point it diminishes my
driving experience.
The tuner guys seem to drive basic cars only a few miles to the shop and home everyday or work mostly with customers who dont spend most of the day in their cars so leaving the car with him a few days doesnt help much since he thinks it is fine. Two hours in city traffic or roll on the throttle driving up a mountain in top gear and the stumble makes me regret messing with a perfectly fine stock car.
Self tuning seems the only way to go unless I want to live in the shop or driving to and from.
With speed density tune, do you remove anything from the car, can you revert back to the original system easily?
On the other hand, my car feels so-so especially off idle stumble to the point it diminishes my
driving experience.
The tuner guys seem to drive basic cars only a few miles to the shop and home everyday or work mostly with customers who dont spend most of the day in their cars so leaving the car with him a few days doesnt help much since he thinks it is fine. Two hours in city traffic or roll on the throttle driving up a mountain in top gear and the stumble makes me regret messing with a perfectly fine stock car.
Self tuning seems the only way to go unless I want to live in the shop or driving to and from.
With speed density tune, do you remove anything from the car, can you revert back to the original system easily?
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rjkrumb (06-01-2016)
03-12-2016, 08:30 AM
#10
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Location: Raleigh, NC
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St. Jude Donor '15
I have been reading about this speed density tune but isnt this taking a step backwards in technology? It is my understanding that the factory used to use speed density for the early fuel injected vehicles then the switch to the maf or current engine management as an improvement. Not only for emissions but several factors.
On the other hand, my car feels so-so especially off idle stumble to the point it diminishes my
driving experience.
The tuner guys seem to drive basic cars only a few miles to the shop and home everyday or work mostly with customers who dont spend most of the day in their cars so leaving the car with him a few days doesnt help much since he thinks it is fine. Two hours in city traffic or roll on the throttle driving up a mountain in top gear and the stumble makes me regret messing with a perfectly fine stock car.
Self tuning seems the only way to go unless I want to live in the shop or driving to and from.
With speed density tune, do you remove anything from the car, can you revert back to the original system easily?
On the other hand, my car feels so-so especially off idle stumble to the point it diminishes my
driving experience.
The tuner guys seem to drive basic cars only a few miles to the shop and home everyday or work mostly with customers who dont spend most of the day in their cars so leaving the car with him a few days doesnt help much since he thinks it is fine. Two hours in city traffic or roll on the throttle driving up a mountain in top gear and the stumble makes me regret messing with a perfectly fine stock car.
Self tuning seems the only way to go unless I want to live in the shop or driving to and from.
With speed density tune, do you remove anything from the car, can you revert back to the original system easily?
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speedz06 (04-24-2016)
03-12-2016, 08:31 AM
#11
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St. Jude Donor '15
Maf's aren't necessarily bad, but ECS's kit has a big dent right before the Maf which adds a lot of turbulence which makes using the maf on that setup not so awesome. Too much turbulence. I'm not saying it can't work, but I've seen 4 people now switch from maf to Sd on ECS kits and every one of them was glad they did
Last edited by schpenxel; 03-12-2016 at 08:32 AM.
03-12-2016, 08:36 AM
#12
Team Owner
Mafs work fine for OEM and stock application, but high HP boosted applications seem to respond better to SD.
What about VE tables? That is what you tune for SD.
What about VE tables? That is what you tune for SD.
03-12-2016, 10:19 AM
#14
Team Owner
Tuning VE tables is tuning speed density tables. Not sure what you are asking about when you said "what about the ve tables".
Even factory runs off VE/speed density until ~4k rpm. Runs a hybrid because maf can't deal with quick air changes, tip in, etc. So it uses "speed density" for that, even with a maf.
You can run maf only, which is what a lot of tuners do, but then you get stumbles, poor throttle response/etc. Not really noticeable, until you go speed density and realize how poorly the maf was doing. That is the big difference. Maf works fine for WOT 4k+ rpm, but most people don't drive around in that range. Most are idle/parking lot/stop lights which SD reacts much better to.
Even factory runs off VE/speed density until ~4k rpm. Runs a hybrid because maf can't deal with quick air changes, tip in, etc. So it uses "speed density" for that, even with a maf.
You can run maf only, which is what a lot of tuners do, but then you get stumbles, poor throttle response/etc. Not really noticeable, until you go speed density and realize how poorly the maf was doing. That is the big difference. Maf works fine for WOT 4k+ rpm, but most people don't drive around in that range. Most are idle/parking lot/stop lights which SD reacts much better to.
Last edited by Unreal; 03-12-2016 at 10:21 AM.
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speedz06 (03-14-2016)
03-12-2016, 01:10 PM
#15
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St. Jude Donor '15
Not much I can add to that.
I guess to play devils advocate the other side is if you make the tuner do SD and there are issues he'll always be able to at least try to blame it on that (regardless of him being right or wrong)
MAF tables are a heck of a lot smaller, so it's quicker to tune a MAF only car than an SD one, typically anyways, so I always wonder if that's part of the reason a lot of tuners want to do MAF only
I guess to play devils advocate the other side is if you make the tuner do SD and there are issues he'll always be able to at least try to blame it on that (regardless of him being right or wrong)
MAF tables are a heck of a lot smaller, so it's quicker to tune a MAF only car than an SD one, typically anyways, so I always wonder if that's part of the reason a lot of tuners want to do MAF only
03-12-2016, 05:45 PM
#17
Team Owner
Thats exactly why most tuners just do Maf only. Quick and easy. SD takes more time. Most customers will never know, and be perfectly happy with maf only.
03-12-2016, 07:40 PM
#19
Team Owner
Both is fine, unless you max out the maf, or have maf limits. So if you are in the range where the maf still reads correctly, that is a great option.
03-12-2016, 10:37 PM
#20
Instructor
I'm switching my tune to SD this Monday. Originally I got tuned using maf only because I did not have the zr1 map sensor to read boost. So I had no option but to use maf at the time. Which is what I think a lot of tuners do.
I have quite a bit of stumbles and hesitations. Mainly coming off idle. But I'll be using SD tune and using the maf for my iat sensor. As I also added methanal. Hopefully that gives a little insight on what some people do.
I have quite a bit of stumbles and hesitations. Mainly coming off idle. But I'll be using SD tune and using the maf for my iat sensor. As I also added methanal. Hopefully that gives a little insight on what some people do.