[choppedliver]

Nice!

Has lighter wheels YMMV.

[Manley00]

Originally Posted by choppedliver

Nice!

Has lighter wheels YMMV.

What is this? Went to your site and feeling a bit lost… available to US? What’s the details?

[choppedliver]

Originally Posted by Manley00

What is this? Went to your site and feeling a bit lost… available to US? What’s the details?

I just found the video. I have no relationship to these guys. I just thought it was pretty impressive for stage 1.

[Manley00]

Originally Posted by choppedliver

I just found the video. I have no relationship to these guys. I just thought it was pretty impressive for stage 1.

My bad! Posted then realized that! Whoops! Makes me REALLY curious what BM3 stage 1 with xHP does… just loaded xHP on my 20 with a JB4 on map 1. It is QUICKK!

[choppedliver]

Originally Posted by Manley00

My bad! Posted then realized that! Whoops! Makes me REALLY curious what BM3 stage 1 with xHP does… just loaded xHP on my 20 with a JB4 on map 1. It is QUICKK!

All good.

The ECUMAP seems to offer OTS tunes which is "650hp" but they say "700hp" in the video so I suspect it's a custom tune. Who knows what it's making at the wheels but this seems about as fast you are going on stage 1 custom tune + XHP.

Next step would be downpipes which I gather is another +50hp or more.

[Manley00]

Originally Posted by choppedliver

All good.

The ECUMAP seems to offer OTS tunes which is "650hp" but they say "700hp" in the video so I suspect it's a custom tune. Who knows what it's making at the wheels but this seems about as fast you are going on stage 1 custom tune + XHP.

Next step would be downpipes which I gather is another +50hp or more.

I’ve never even heard of these guys before. Have they found a way to crack the ECUs? Without a bench unlock. Their website says 20+. The website couldn’t be any more vague about anything. They make it appear like it’s a simple remote tune.

[choppedliver]

Originally Posted by Manley00

I’ve never even heard of these guys before. Have they found a way to crack the ECUs? Without a bench unlock. Their website says 20+. The website couldn’t be any more vague about anything. They make it appear like it’s a simple remote tune.

Yeah, I'd go BM3 OTS + xHP initially. That's what my local shop specialises in and BM3 is a known quantity. The shop has an AWD hub dyno so we can get some accurate wheel numbers instead of estimated flywheel numbers.

If I can get 10.6 or so then that will be a good result in my opinion. A full second quicker than I've done stock and those pesky Teslas will eat dust.

I would also assume that these guys will need an unlocked ECU. My car is June 2020 so fingers crossed it's a simple bench unlock as we are before the theoretical July build cutoff when they started locking everything down.

[Manley00]

Originally Posted by choppedliver

Yeah, I'd go BM3 OTS + xHP initially. That's what my local shop specialises in and BM3 is a known quantity. The shop has an AWD hub dyno so we can get some accurate wheel numbers instead of estimated flywheel numbers.

If I can get 10.6 or so then that will be a good result in my opinion. A full second quicker than I've done stock and those pesky Teslas will eat dust.

I would also assume that these guys will need an unlocked ECU. My car is June 2020 so fingers crossed it's a simple bench unlock as we are before the theoretical July build cutoff when they started locking everything down.

Awesome! I’m waiting to do the tune until I do the downpipes. I’m a 7/19 build and have confirmed it can be bench unlocked in Dallas! Wish I had access to E85. Same as you- I’d be very happy with 10.5 at 135. You’re walking almost anything in the street. With my AC seats on massaging me 🤣

[Duta569]

Originally Posted by Manley00

My bad! Posted then realized that! Whoops! Makes me REALLY curious what BM3 stage 1 with xHP does… just loaded xHP on my 20 with a JB4 on map 1. It is QUICKK!

Originally Posted by Manley00

Awesome! I’m waiting to do the tune until I do the downpipes. I’m a 7/19 build and have confirmed it can be bench unlocked in Dallas! Wish I had access to E85. Same as you- I’d be very happy with 10.5 at 135. You’re walking almost anything in the street. With my AC seats on massaging me 🤣

10.5 in the quarter is tough. My best without xhp was a 10.69, that's with 715 horsepower and 750 wheel torque.

[Manley00]

Originally Posted by Duta569

10.5 in the quarter is tough. My best without xhp was a 10.69, that's with 715 horsepower and 750 wheel torque.

Holy hell! In your M550? 10.5-10.99= same to me. Lolll jk. Really though a sub 11 second street car is insanely fast.

[Duta569]

Originally Posted by Manley00

Holy hell! In your M550? 10.5-10.99= same to me. Lolll jk. Really though a sub 11 second street car is insanely fast.

My 60 to 130 tonight (with low da) was 6.85.

There is no way that that is a stage 1 - 93 tune on that car in the video.

[Duta569]

Originally Posted by Manley00

Holy hell! In your M550? 10.5-10.99= same to me. Lolll jk. Really though a sub 11 second street car is insanely fast.

Also, I wish a 10-5 and a 10.99 was the same! Haha.

At a drag strip, the 10-5 would put five car lengths on a 10.99.

[choppedliver]

Originally Posted by Duta569

My 60 to 130 tonight (with low da) was 6.85.

There is no way that that is a stage 1 - 93 tune on that car in the video.

Why not?

Boosted8 (boostedsix on Dragy) did 10.9 with secondary cat delete and 4 psi of extra boost from JB4. Similar DA and temps. I know he had issues with torque limits in 1st gear IIRC.

It seems plausible to be 0.3 faster with a proper tune and XHP stage 3.

[dhodory]

A little bit of a disconnect somewhere.

The ECUMAP website shows stage one tune as 650 HP.

The video says stage one tune is 700 HP.

https://www.ecumap.com/page/vehicle-...83-m550i-530hp

[Duta569]

Originally Posted by choppedliver

Why not?

Boosted8 (boostedsix on Dragy) did 10.9 with secondary cat delete and 4 psi of extra boost from JB4. Similar DA and temps. I know he had issues with torque limits in 1st gear IIRC.

It seems plausible to be 0.3 faster with a proper tune and XHP stage 3.

Yeah i guess your right. 10.9 with jb4, now you add xhp, all jb4 users and stage-1 M550's should be running consecutive 10.5's in the quarter mile.

Anybody running a stage 2 should be running, hopefully, high 9's low 10's.

I'm going to keep my eye on the draggy leaderboard to start seeing all the high 9's/ mid 10's. It's going to be exciting.

[WretchedRefuse]

Originally Posted by Duta569

Yeah i guess your right. 10.9 with jb4, now you add xhp, all jb4 users and stage-1 M550's should be running consecutive 10.5's in the quarter mile.

Anybody running a stage 2 should be running, hopefully, high 9's low 10's.

I'm going to keep my eye on the draggy leaderboard to start seeing all the high 9's/ mid 10's. It's going to be exciting.

I've never seen much of a difference between Stage 1 and Stage 2. Maybe 0.1-0.2 in the 1/4 mile. The problem with Stage 2 is that there are so many variables involved, e.g. which downpipes, spark plugs, intake, other mods, etc. Stage 1 is on a known platform so should be more consistent.

Having said that, I'd love to be proven wrong by somebody here.

[choppedliver]

Originally Posted by Duta569

Yeah i guess your right. 10.9 with jb4, now you add xhp, all jb4 users and stage-1 M550's should be running consecutive 10.5's in the quarter mile.
.

LOL.

I guess it depends how much XHP is worth in the quarter. I've seen estimates that it can reduce 0-60 by about 0.2. I'd like to see what improvements stock cars are getting as that may be an indication of what stage 1 could improve by.

[choppedliver]

Originally Posted by dhodory

A little bit of a disconnect somewhere.

The ECUMAP website shows stage one tune as 650 HP.

The video says stage one tune is 700 HP.

https://www.ecumap.com/page/vehicle-...83-m550i-530hp

Exactly, so it makes me think it's a custom tune.

What is 700hp at the wheels, who knows! I'd be guessing 600ish, which kinda matches to various comments about downpipes giving you another 40-50whp. Which is what the RKtunes car did with downpipes and tune.


Unless its wheel horsepower who knows really how much power the car is making.

[Manley00]

Originally Posted by choppedliver

LOL.

I guess it depends how much XHP is worth in the quarter. I've seen estimates that it can reduce 0-60 by about 0.2. I'd like to see what improvements stock cars are getting as that may be an indication of what stage 1 could improve by.

I really need to buy a draggy! After having driven the miles now- I can say. The xHP essentially feels like running Map 1 on the JB4 all over again. I jumped off the line today with no launch. It hits second so hard I stayed spinning. I had to let out and get back in it. I had no idea a trans tune would wake the car up the way it has.

I do know on this specific vehicle the torque limiting is quite dramatic. Even when reading logs of my runs. You can see the dips. I wonder if the M550 was setup that way so it was such a competitor with the M5. Having them both sharing quite a bit now in the motor department.

Like, was that the key to really unlocking the vehicles potential? Have the 20+ been limited in that sense. Now we have removed that we are barking at the heels of an M5. I could be completely wrong- it certainly woke the car up.

[choppedliver]

Originally Posted by Manley00

Like, was that the key to really unlocking the vehicles potential? Have the 20+ been limited in that sense. Now we have removed that we are barking at the heels of an M5. I could be completely wrong- it certainly woke the car up.

This is likely the case.

My benchmark here is the G80 M3.

Less power/torque, similar weight, same gearbox. Some of that is more aggressive gearing (lower final gear) but surely the gearbox tune has an impact and I suspect the same in the M5. The M5 has a lower final gear as well I think.

Our car is more of GT so it makes sense that BMW would make it slower and more cruisy. We have the same torque as the M5, and whilst our top end power figure is lower there shouldn't be as much of a gap as there is.

Edit: checked and M5 has a shorter final drive and different ratios than M550i. M850i has even shorter final drive and similar ratios as M5 (I assume to help with the extra weight).

[WretchedRefuse]

Originally Posted by choppedliver

... Edit: checked and M5 has a shorter final drive and different ratios than M550i. M850i has even shorter final drive and similar ratios as M5 (I assume to help with the extra weight).

Would you mind sharing the final drive ratios of the M5 and 550? Also, are the transmission gears the same between the two?

I've never driven an M5 but would love to do an A/B comparison between the M5 and a modded 550 (either JB4 or BM3 Stage 1 plus xHP trans tune.)

[Manley00]

Originally Posted by WretchedRefuse

Would you mind sharing the final drive ratios of the M5 and 550? Also, are the transmission gears the same between the two?

I've never driven an M5 but would love to do an A/B comparison between the M5 and a modded 550 (either JB4 or BM3 Stage 1 plus xHP trans tune.)

I’ve seen a few videos of JB4 or stage 1 up against M5s…. The M550 tends to walk them.

This is just one example- https://youtu.be/dEAtW7EdCAU

From a dig I’ve seen the same. This was obviously prior to the xHP.