[rjahl]

Are there separate ZB numbers for the cruise control option? I thought the programs 0da/0pas were the same and it's an option built into the VO.

Maybe the Eu versions require a different VO entry then the US versions?

[Joebie]

Okay so here is some more very strange information about my problem:

This morning, 9am, driving 2 hours to an offsite job, cruise control would not work on the highway, in 6th gear, at about 80mph.

I got to work, and then posted the message you see maybe 3 or 4 posts up about my cruise control not working.

This afternoon on the way home, I tried again, 6th gear, 80mph, and cruise control worked fine!

So I tried 5th gear. Cruise control won't work.

Tried 4th gear, it works.

Tried 3rd gear, it works.

Tried 2nd gear, it works.

Set cruise to 40mph in 2nd gear, shifted 2->3->4->6th gear flawlessly and maintained a 40mph cruise, even though the shifting, as it should.

Shift to 5th and I get a "BONG" form the car and an exclamation point with a cruise control icon next to it. Try to set cruise control while already in 5th gear and I just get a "---" next to a speedo icon on the dash and it doesn't work.

.
.
.
.

SO IN SUMMARY

I've observed 2 different behaviors today alone. In the morning, cruise control didn't work in 6th. I didnt think to try any other gear at this point. This afternoon, cruise control works fine in any gear except 5th gear.

I don't know how to explain any of this.

And yes I'm sure I flashed the MAF version. I flashed "MSV80_A951181_328i_to_330i.0da".

One thought that I had was maybe my 3.73 diff swap might be making it mad? I dont know if it compares speed to RPM or something to figure out what gear its in... probably not, but just a thought that I had.

[Biginboca]

I’ve heard there’s a clutch switch on some cars that is related to cruise control and can go bad, might be worth a check.

[Joebie]

Originally Posted by Biginboca

I’ve heard there’s a clutch switch on some cars that is related to cruise control and can go bad, might be worth a check.

I remember checking these a few days ago with INPA when I had just installed INPA and was learning about it by just playing around with the different menus and stuff.

Both my clutch and brake switch function as I would expect them to.

Thanks for the suggestion!

[hassmaschine]

Originally Posted by Joester

Okay so here is some more very strange information about my problem:

This morning, 9am, driving 2 hours to an offsite job, cruise control would not work on the highway, in 6th gear, at about 80mph.

I got to work, and then posted the message you see maybe 3 or 4 posts up about my cruise control not working.

This afternoon on the way home, I tried again, 6th gear, 80mph, and cruise control worked fine!

So I tried 5th gear. Cruise control won't work.

Tried 4th gear, it works.

Tried 3rd gear, it works.

Tried 2nd gear, it works.

Set cruise to 40mph in 2nd gear, shifted 2->3->4->6th gear flawlessly and maintained a 40mph cruise, even though the shifting, as it should.

Shift to 5th and I get a "BONG" form the car and an exclamation point with a cruise control icon next to it. Try to set cruise control while already in 5th gear and I just get a "---" next to a speedo icon on the dash and it doesn't work.

.
.
.
.

SO IN SUMMARY

I've observed 2 different behaviors today alone. In the morning, cruise control didn't work in 6th. I didnt think to try any other gear at this point. This afternoon, cruise control works fine in any gear except 5th gear.

I don't know how to explain any of this.

And yes I'm sure I flashed the MAF version. I flashed "MSV80_A951181_328i_to_330i.0da".

One thought that I had was maybe my 3.73 diff swap might be making it mad? I dont know if it compares speed to RPM or something to figure out what gear its in... probably not, but just a thought that I had.

Ahh, yes in fact I bet it is your diff swap that's pissing it off. Since the current gear is calculated by using RPM and VSS.

It's possible to adjust the gear ratio in the tune of course to match your cruise control.

[Joebie]

Originally Posted by hassmaschine

Ahh, yes in fact I bet it is your diff swap that's pissing it off. Since the current gear is calculated by using RPM and VSS.

It's possible to adjust the gear ratio in the tune of course to match your cruise control.

But then why would it not even work in 6th gear this morning? I'm fine with it not working in 5th gear. The only time I use cruise is in 6th gear anyways, but I'm still confused about the inconsistent behavior ive observed lol.

[Biginboca]

I’ve run a 3.73 and a 3.91 diff in my car and my cruise control works, although I’ve only tried it in 6th gear.

[rjahl]

Originally Posted by Joester

But then why would it not even work in 6th gear this morning? I'm fine with it not working in 5th gear. The only time I use cruise is in 6th gear anyways, but I'm still confused about the inconsistent behavior ive observed lol.

Does the cruise control even try to work in 5th gear? If coasting along at 50 MPH in fifth and you hit the stalk does it fail or will it try to hold a speed for a few seconds and then fail?

Try a few things like setting the cruise a speed above your current speed and below. Use resume.

Maybe it's an expected torque calculation within the cruise control subroutines. The DME is expecting certain load,speed conditions and the values are falling outside an expected range. Just think about the math involved to keep your car at a constant speed.

[Marc81]

I had the same issue after putting in 373s ... I had to change a setting (any) in the kombi readout through Carley and then change back . Basically just resetting the cluster.

[Joebie]

Originally Posted by rjahl

Does the cruise control even try to work in 5th gear? If coasting along at 50 MPH in fifth and you hit the stalk does it fail or will it try to hold a speed for a few seconds and then fail?

Try a few things like setting the cruise a speed above your current speed and below. Use resume.

Maybe it's an expected torque calculation within the cruise control subroutines. The DME is expecting certain load,speed conditions and the values are falling outside an expected range. Just think about the math involved to keep your car at a constant speed.

If I'm already in 5th, it doesnt even try. If I set the cruise in another gear and then shift to 5th, it either immediately errors out or tries for like a tenth of a second and then errors out.

Originally Posted by Marc81

I had the same issue after putting in 373s ... I had to change a setting (any) in the kombi readout through Carley and then change back . Basically just resetting the cluster.

Strange you mention this, I recently messed with my kombi by changing my MPG readout to Oil temp. Never used the cruise since. So maybe this isn't even related to the 330i tune....

[hassmaschine]

Originally Posted by Joester

But then why would it not even work in 6th gear this morning? I'm fine with it not working in 5th gear. The only time I use cruise is in 6th gear anyways, but I'm still confused about the inconsistent behavior ive observed lol.

Because it doesn't think it's in a valid gear. In 5th gear at whatever speed you happen to be going when you try to set it, it errors because it doesn't think the gear is valid. If it works at one speed in 6th it might not work at a different one for the same reason.

Basically it does something like RPM / VSS = gear ratio (more complicated than that, but you get the idea). Since it knows the gear ratios in the stock transmission (and final drive), it knows what gear you are in.

But now your VSS / RPM ratio is way off (because the RPM is higher at the same speed), so the calculated gear ratio is no longer plausible.

The proper way to fix that is to change the constant for the final drive ratio to match your actual ratio.

People ran into this with the E46 M3 when switching to 4.10s or higher. the SMG computer would go crazy. The worst was going above 4.10, because it was only an 8 bit value and you couldn't make it any bigger.

[dwsavenko]

Thanks Hass for confirming the Cruise Control is a known issue on the MAF-less tune. That's awesome.

I can confirm I have had no issues with the normal 128i to 130i tune file. (On a 6spd MT)

In fact when I first swapped to this tune file it fixed bad work from a previous owner whom had a "custom tune" done which also broke the cruise.

Again, we all appreciate your hard work.

[Joebie]

Originally Posted by dwsavenko

For the large DISA test, you can just take off your main air-inlet, and take off the DISA holding screws, I was able to back it out far enough to see if it was moving properly, without removing too much stuff. Good piece of mind.

So I dug into my car this afternoon to real quick test my large disa valve and I found that it isn't closing all the way. Since the small valve usually breaks before the large valve, I can pretty safely assume this is why I didn't feel the power improvement I expected out of the 330i tune. They're probably both broken. I was able to get the large disa screws out by just moving the power steering fluid reservoir.

This is of course unrelated to my cruise control issues, but I just wanted to update anyone who might read this thread later and doubt the 330i tune. Have no fear, mine just isn't working right, its a hardware issue.

I'm currently trying to muster up the will power to press "order" on two new disa valves to the tune of $600+. I'm telling myself that I've already put so much effort into this car that it's worth it to get all the power and enjoyment I can out of it. But it still makes my wallet cry.

[dwsavenko]

OUCH!

Don't spend that much.

The large DISA is a bargain here: https://www.ebay.ca/itm/Intake-Manif...L/302802488657

For the little guy, usually they are in better shape. You can pry it apart, and clean the motor etc. Or buy the rebuild kit.

Just keep looking for a better price. (Rockauto?)

[bluewater328]

Originally Posted by Joester

....I'm currently trying to muster up the will power to press "order" on two new disa valves to the tune of $600+. I'm telling myself that I've already put so much effort into this car that it's worth it to get all the power and enjoyment I can out of it. But it still makes my wallet cry.

So, yes, you could get genuine one...or there are some eBay sellers that sell the generic ones for much less (<$100 ea) Just saying.

[Joebie]

I don't want to derail this thread too much but

-I've heard that the offbrand ones dont last long at all
-FCP euro comes with lifetime warranty so if it breaks again a new genuine one is free

With that being said, I'll still search around for more people's experience with the generics before placing the order. Maybe they aren't as bad as I think.

[dwsavenko]

I just don't don't think you will notice $600 of difference from a sloppy DISA valve(s).

I did notice a better motor response when mine were working correctly (fixed), but it is still fairly subtle, and only at certain RPM ranges.

I would test the small unit first before replacing, and or give the generics a test.

Of course this is a budget car for me. Your value of money may be different then mine lol. Best of luck!

[Bufalo]

I paid seventy-five bucks for a replacement small valve from eBay and it's been fine for six months so far. Not exactly proof of longevity yet, but it does work! I paid 170 for my large valve from somewhere, it's been good for a year now. Edit - I bought the large DISA from Amazon.

[Biginboca]

Just to check I tried my cruise control in 4th, 5th, and 6th gear this morning and it worked fine in all gears with my 3.91 diff. And I ran a 3.73 diff for about a year and a half and also never had any cruise control issues. No special programming done, or messing with the kombi.

[Joebie]

Originally Posted by Biginboca

Just to check I tried my cruise control in 4th, 5th, and 6th gear this morning and it worked fine in all gears with my 3.91 diff. And I ran a 3.73 diff for about a year and a half and also never had any cruise control issues. No special programming done, or messing with the kombi.

Thanks for doing that test.

You've got a BPC tune though right? I'd imagine with the price tag on that they probably got their stuff figured out. That'd be really disappointing to pay $750 or whatever for a tune that breaks your cruise control lmao.

[Joebie]

So after sleeping on it, I went ahead and bought 2 brand new OEM BMW Disa valves from FCP Euro for $620.

I recently replaced the engine in my car after I blew it, I replaced every gasket that normally leaks, I replaced the water pump, the clutch and flywheel, added MILVS and bought this 3 stage intake manifold. Everything about my car is in perfect condition all the way down to the exterior body panels and interior leather and trim.

I plan to keep and enjoy this car for as long as possible because it really is the best car you can get for under $10k, by a wide wide margin.

Since they're OEM BMW I know they'll work for a long time, and since I bought from FCP Euro, if and when they ever do break again, the replacement is free.

I cant wait to get and install them and see how the car feels afterwords.

I'm also going to look at what went wrong with the old disa valve(s)... I'm a mechanical engineer and may be able to find a fix for partially closing valves, who knows.

[hassmaschine]

Originally Posted by Biginboca

Just to check I tried my cruise control in 4th, 5th, and 6th gear this morning and it worked fine in all gears with my 3.91 diff. And I ran a 3.73 diff for about a year and a half and also never had any cruise control issues. No special programming done, or messing with the kombi.

And there's no reason it shouldn't. But your tune is modified - what he's talking about is a tune meant for basically stock cars with a 3-stage swap, it has no changes for diff ratio. That can be done easily enough but it's not included in a free tune.

There is hysteresis, so if you made a change from say a 3.73 calibration to 3.91 it would be fine, but going from 3.15 to 3.73 wouldn't be a good idea without changing the final drive calibration. Maybe it will even adapt itself but you would have to reset the adaptations probably.