[M-Pilot]

I’ve been running RaceChip GTS Black on my 2024 X5 40i since last November and I haven’t been observing the huge gains according to my butt dyno. Yesterday finally took it to a local dyno shop to get it measured.

First run was on stock tune and the last two runs were on Map 7. As you can see, not even 20whp gain. Extremely disappointing… Emailed Racechip support and curious what they will say. This is way off their advertised gains.

[M-Pilot]

Just to add, the car was on 93-94oct (mixed 100oct with 91).

[blackoutF15]

Im not backing anyone up cuz I don’t give a crap coming from a consumer. I don’t fully believe any of the claims these companies make, but I know the gains is pretty significant on RC in my past f15 and new f95. Do you have any bolt on performance updates on the 40? In my experience if the car is stock, setting RC on map 7 actually does not maximize the performance as if it was on 5. On my f95 now, I’ve got the RC GTS black and XLR with CAI, dps, catback, I find the sweet spot is map 6 not 7 on m2 mode which is sport plus on our bmw.

[M-Pilot]

No mods on the car aside from the RaceChip.

[swainbmw]

Originally Posted by M-Pilot

No mods on the car aside from the RaceChip.

I had the dinan version before then got the gts black I can tell a difference not sure how much more hp but it does feel better than stock also have a new down pipe have yet to get installed and did add the cold air intake from dinan also I think that also help please post back on racechip answer. From email

[BIGW0RM]

I’m new here in the x5 forum. And I haven’t turned a car since the f80 m3 obd2 boot mod days. I have zero experience with RC.

But perhaps the additional power the 24/25 LCI models make is basically what the RC would have offered? I mean, if bmw improved the power 30-40HP over the pre LCI. And piggybacks usually offer 50-60hp. It would be my guess that you got the 60hp over. My thinking is. Perhaps the tune is basically the same tune as the pre LCI motor tune? But since bmw added 40hp to the LCI. The RC tune isn’t going to add 60 to that. At least I don’t think it would. Especially if it’s the same tune used on the pre LCI engines.

But what do I know. But that’s my thought on it.

[M-Pilot]

Originally Posted by BIGW0RM

I’m new here in the x5 forum. And I haven’t turned a car since the f80 m3 obd2 boot mod days. I have zero experience with RC.

But perhaps the additional power the 24/25 LCI models make is basically what the RC would have offered? I mean, if bmw improved the power 30-40HP over the pre LCI. And piggybacks usually offer 50-60hp. It would be my guess that you got the 60hp over. My thinking is. Perhaps the tune is basically the same tune as the pre LCI motor tune? But since bmw added 40hp to the LCI. The RC tune isn’t going to add 60 to that. At least I don’t think it would. Especially if it’s the same tune used on the pre LCI engines.

But what do I know. But that’s my thought on it.

Sorry but your theory is just not correct. The difference between pre-LCI and LCI is more than just a tune. LCI is a mild hybrid with other changes on the B58 engine (LCI has the gen3 B58).

Looks at the JB4 Dyno results on the LCI B58 engine:

https://burgertuning.com/collections...gen3-jb4-tuner

Even on map2 (which is good for pump gas), they achieve 78whp gain over stock. I’m seriously considering switching to JB4.

[M-Pilot]

Also, Racechip claims 99HP gain over stock. To be clear, I was not expecting to see anything close to this number on the dyno knowing how these companies love to inflate their numbers but seeing a mere 16whp gain on the dyno is a joke.

[BIGW0RM]

Originally Posted by M-Pilot

Sorry but your theory is just not correct. The difference between pre-LCI and LCI is more than just a tune. LCI is a mild hybrid with other changes on the B58 engine (LCI has the gen3 B58).

Looks at the JB4 Dyno results on the LCI B58 engine:

https://burgertuning.com/collections...gen3-jb4-tuner

Even on map2 (which is good for pump gas), they achieve 78whp gain over stock. I’m seriously considering switching to JB4.

I realize there a power difference between pre LCI and the LCI. And the added mild hybrid. But as far as I can see. The RC shows support from 18 onward. It seems to me that they based the tune off the original 335hp motor the x5 use to have. At least it seems that way based off this screen shot.

When you plug it in, do you specifically tell it you have a LCI motor? Or are the maps configured for an LCI specifically? Because if there not, it’s my guess that, that’s all your going to get out of that piggyback.

I’m not sticking up for them. Or trying to argue you. But the piggyback appears to be based off the 335hp engine. That’s why I’m suggesting that you’re most likely not going to see 60hp over LCI power.

[M-Pilot]

Originally Posted by BIGW0RM

I realize there a power difference between pre LCI and the LCI. And the added mild hybrid. But as far as I can see. The RC shows support from 18 onward. It seems to me that they based the tune off the original 335hp motor the x5 use to have. At least it seems that way based off this screen shot.

When you plug it in, do you specifically tell it you have a LCI motor? Or are the maps configured for an LCI specifically? Because if there not, it’s my guess that, that’s all your going to get out of that piggyback.

I’m not sticking up for them. Or trying to argue you. But the piggyback appears to be based off the 335hp engine. That’s why I’m suggesting that you’re most likely not going to see 60hp over LCI power.

See the screenshot shared above and the screenshot you shared. They have two different products running two different software for LCI and pre-LCI. The bottomline is that LCI is actually a more potent/tuneable engine based on all the results available online so their device for LCI probably adds more psi over stock.

Piggyback is just that, piggyback. It just adds boost on too of stock. Even if I was running their pre-LCI device I would have expected to see gains way more than just 15-16whp.

That being said, there are various videos on Youtube showing dyno results with Racechip with decent gains. I’m wondering if there is something wrong with my unit/software. Curious how they will respond (if at all).

[BIGW0RM]

Ah. I didn’t see the drop down for our motor. My bad. Now I totally understand your disappointment. I’d not be very happy either now that I see there is one specificity for our motor. Hopefully you’ll get some results from them regarding this.

Best of luck!

[sharkymcpeterson]

Did you try the dyno on all maps? Sometimes map 7 doesn’t give the best boost I’ve heard. I’ve heard people say 6 and I’ve heard 5…..I run rc on my m50, it definitely made a difference for me but I haven’t put it on the dyno. Probably should…..

Anyways I’d be interested to heard what racechip has to say…..


I keep hounding them online to show results for the x5 they’ve been ignoring me for years.

[M-Pilot]

Originally Posted by sharkymcpeterson

Did you try the dyno on all maps? Sometimes map 7 doesn’t give the best boost I’ve heard. I’ve heard people say 6 and I’ve heard 5…..I run rc on my m50, it definitely made a difference for me but I haven’t put it on the dyno. Probably should…..

Anyways I’d be interested to heard what racechip has to say…..


I keep hounding them online to show results for the x5 they’ve been ignoring me for years.

No unfortunately. I only did 3 runs (first on stock tune and last two on map 7).

They just replied to me this morning requesting some photos of the engine bay. I guess they want to make sure everything is connected correctly and also it’s indeed a B58 gen3 engine. I’ll keep the thread updated with the outcome.

[Oldgixxer]

I'm leaning towards something is off with your RC GTS.

Different platform & different I-6 obviously,but they advertised +99hp&+91lb-ft for the X3MC on their website. I got +97awhp and +82lb-ft measured w back to back pulls(stock/RC GTS),same day on a dyno which is pretty close to their claims.

Hopefully it's something simple and you're able to get some noticeable HP in the end

If you're interested:
https://x3.xbimmers.com/forums/showthread.php?t=1944152

[M-Pilot]

It’s been 2 days since sent RaceChip all the requested pics. Despite me also sending a few follow up emails, I haven’t heard anything back from them.

Their customer service hasn’t been any better than their product so far. I’m not sure what to do or how to proceed at this point.

[M-Pilot]

Update: They finally emailed me back last Friday after tried to reach out to them on various social media channels by sending direct messages and commenting on their posts. Of course they were lightning quick to delete my comments which included a link to this thread.

Their latest response was that they are still discussing this issue with their development team and will let me know about the next steps. I mean it’s not like there are any logs to review or dig through. Not sure what’s taking so long.

TLDR: No progress and my frustration continues.

I will continue to blast their posts with a link to this thread if I don’t hear back from them in the next few days.

[typedcl]

Any updates that you can share? Thanks!

[PNWM50I]

Seems like a simple customer service solution of having you send your unit in and they will send you a new one out.
Thanks for sharing your experience and sorry you’ve had bad results.

[M-Pilot]

Originally Posted by typedcl

Any updates that you can share? Thanks!

Yes, I finally got some answers from them.

They had sent me a software update last year after I opened a case and reported the car was cutting power at high RPM even on map 5 (I had also let them know that I'm using California 91oct but they said their tune can work on CA 91oct). Anyway, their update eliminated those power cut issues and they did claim in their email from last year that this update shouldn't affect the peak power and the should still be making their claimed numbers.

Fast forward to a week or so ago when I finally got someone to reply to my open ticket in a timely manner. They now claimed the car made so little extra power because of this update and sent me a new update. I'm currently running the latest software update and can't really tell if the car is really making any more power than before but I will take it for another dyno run on Wednesday to have some data in hand.

This time I will test stock, map 5, map 6, and map 7 on dyno.

Regarding the above comment about a replacement unit, I asked for a replacement unit several times and they keep ignoring my request.

I will update the thread after they dyno session on Wednesday.

[Oldgixxer]

Looking forward to Dyno results

[M-Pilot]

Alright the results are in. Numbers are looking much better after their update.

Did 2 runs on stock and 1 run each on map 5, 6 and 7. For some reason the dyno operator only printed the stock , map 5, and map 7 but it’s fine. The car actually made slightly less power on map 6 than map 5 (but more in torque).

Anyway, this was again a Mustand dyno and I made sure the car was running 93oct (by mixing 91oct and 100oct).

394whp 417wtq stock
415whp 435wtq map 5
424whp 458wtq map 7

30whp/40wtq is more inline with what I’d expected from this piggyback so it’s all good now. Wish their customer support weren’t this bad in handling this though.

[CT335xi]

Originally Posted by M-Pilot

Alright the results are in. Numbers are looking much better after their update.

Did 2 runs on stock and 1 run each on map 5, 6 and 7. For some reason the dyno operator only printed the stock , map 5, and map 7 but it’s fine. The car actually made slightly less power on map 6 than map 5 (but more in torque).

Anyway, this was again a Mustand dyno and I made sure the car was running 93oct (by mixing 91oct and 100oct).

394whp 417wtq stock
415whp 435wtq map 5
424whp 458wtq map 7

30whp/40wtq is more inline with what I’d expected from this piggyback so it’s all good now. Wish their customer support weren’t this bad in handling this though.

Those are some impressive numbers for a stock x5 40i on mustang dyno, those dynos tend to read lower then dyno-jets . Your car is making more power at the wheels then factory claimed at the crank.