[ttdmac]

So I recently started running OTS Stage 0 map on my 2007 335i, however I didn't bother taking the SSTT off the MAP sensor.

I don't think I will encounter too many issues with that, but I've also been known to be wrong.

Any ideas?

[jpsimon]

isn't the sstt a 2 second removal? why not just take it off to be safe

[3000GT MR]

Ots map 1 will be 10000% better than a sstt

[Allen@MOTIV]

Do not do it. You will be overboosting severely and the DME will not realize it.

[Jnat]

For us slow people, what is the SSTT?

[sutter2k]

Originally Posted by jnat

For us slow people, what is the SSTT?

http://www.splitsec.com/products/turbotuner2.htm

[3000GT MR]

A flash tune allows the dme to see and control exactly what's going on without being fooled. With the sstt in place the proper cells aren't be tracked and that is pretty dangerous on a flash tune where the margin of error is a lot less

[Jeff@TopGearSolutions]

You should not leave the SSTT in place with another tune.

[AWTT335i]

Wow.

Some people are pretty dam clueless, do you go indoors when it rains?

[ttdmac]

So instead of insults, how about some constructive feedback?

Anyway as I can remember the SSTT only adjusts the MAP voltage reported back to the DME and even then it only calls for the DME to deliver 2 psi additional boost based on the adjusted absolute pressure reading. Wouldn't the flashed DME adjust for that voltage reading regardless?
It would be the same as taking a car from sea level to high altitude.

I haven't taken a close look at the OTS Stage 0 to see if 2 psi additional boost across the board would cause any major issues.
If anyone has real factual feedback, that would be appreciated.

[3000GT MR]

Originally Posted by ttdmac

So instead of insults, how about some constructive feedback?

Anyway as I can remember the SSTT only adjusts the MAP voltage reported back to the DME and even then it only calls for the DME to deliver 2 psi additional boost based on the adjusted absolute pressure reading. Wouldn't the flashed DME adjust for that voltage reading regardless?
It would be the same as taking a car from sea level to high altitude.

I haven't taken a close look at the OTS Stage 0 to see if 2 psi additional boost across the board would cause any major issues.
If anyone has real factual feedback, that would be appreciated.

No the flash actually targets a higher map setting. There really isn't any tricking going on. Remove the sstt and run a stage 1 Map. Better timing, more boost, better throttle response, remapped vanos, etc. It's safer because the dme is still in control of everything and can see/adjust everything like stock control.

[ttdmac]

Thank you 3000GT MR. I'll reflash to the OTS Stage 1 and try it out, but I'll wait until it's above 10 degrees F outside.

[AWTT335i]

Originally Posted by ttdmac

Thank you 3000GT MR. I'll reflash to the OTS Stage 1 and try it out, but I'll wait until it's above 10 degrees F outside.

Why? Cooler weather = lower IAT = more poweeeeeerrrrrrr

[Dmacc]

Originally Posted by AWTT335i

Why? Cooler weather = lower IAT = more poweeeeeerrrrrrr

= some wild tire spin!

[ttdmac]

So I pulled a log from the car running Stg 0 with the SSTT.

http://datazap.me/u/ttdmac/3rd-gear-...t?1-3-5-6-8-10

The fuel trim takes a dive as I pass through 4600rpm. Is this something I should be concerned with? AFR is 11.34-44 so it's looks okay if a bit lean.

I also notice that I'm peaking at 17.7psi early on and tapering quickly. Is there a reason for the boost to be hitting that early?

Constructive feedback welcome.

Yes I will be removing the SSTT and doing another pull on Stage 0 and Stage 1 shortly.

[Allen@MOTIV]

DME reported boost is not actual boost. Your engine is seeing higher than 17.7psi, potentially significantly higher.

[Jeff@TopGearSolutions]

It said 17.7 PSI but it also had a throttle closure of only 74% TPS at the same time.

11.3 AFR is hardly lean. It's plenty rich actually.

The engine may be seeing more then 17.7 PSI but we really don't know since throttle closure inflates boost numbers and the SSTT boost may inflate the numbers also. You are blind when working with the SSTT which is why it's imperative it's removed.

[ttdmac]

New log. Removed SSTT.

http://datazap.me/u/ttdmac/ots-stage...1-3-4-5-6-8-12

[Jeff@TopGearSolutions]

Originally Posted by ttdmac

New log. Removed SSTT.

http://datazap.me/u/ttdmac/ots-stage...1-3-4-5-6-8-12

Boost is inflated artificially high because you have excessive throttle closure.

Since boost is read pre throttle any closure of the throttle will inflate the boost reading but your engine is not actually seeing those boost figures.

This tune will need tweaking to get it right. What exactly I'm not sure.

I'll leave that up to the tuner or any OFT users.

Have you had any turbo's replaced recently or any other hardware?

[ttdmac]

Strange that the DME is still seeing higher boost without the SSTT attached.

Do I need to reset the DME?

[Jeff@TopGearSolutions]

Originally Posted by ttdmac

Strange that the DME is still seeing higher boost without the SSTT attached.

Do I need to reset the DME?

AS mentioned previously its because you have throttle closure.

Throttle closure creates turbulence and ARTIFICIALLY inflates boost figures.

Your tune will need adjustments to fix the throttle closures and / or You should try resetting the DME and all adaptations as that may fix the problem too.

It's always best practice to reset adaptations after any hardware changes.