[jchamp922]

Wanted opinions on which is the better option? Don't want to unlock ECU right now

[oldbmwtech]

Originally Posted by jchamp922

Wanted opinions on which is the better option? Don't want to unlock ECU right now

I have the Racechip S and the only reason I bought it was the GTS engine warranty is worthless. Please read the warranty terms.

[jchamp922]

How do you like it and do you feel a difference?

[ehBloody]

Originally Posted by jchamp922

How do you like it and do you feel a difference?

Same boat as you. Don't want to unlock the ECU as of now. Curious if it's worth running a piggyback. Did you ever look into Dinan's?

https://www.dinancars.com/products/s...arts/D440-0153

Btw I'm also in Stamford CT lol. I've only seen a single G42 here and it was wrapped in Matte Black.

[baron95]

Originally Posted by oldbmwtech

I have the Racechip S and the only reason I bought it was the GTS engine warranty is worthless. Please read the warranty terms.

Why do you say the warranty is worthless? Not arguing, just asking.

[Aramis1919]

Have you considered a JB+. I have one and it offers pretty much the same performance gains as the JB4 but without the 'bells and whistles'

Bought new about £200........used can be less than half that. I actually paid £25 for mine from Ebay as one of the clips was slightly cracked.

Five minutes to fit under the bonnet.

[mike@x-ph.com]

Originally Posted by jchamp922

Wanted opinions on which is the better option? Don't want to unlock ECU right now

the better option is the Jb4, its the more capable tunes without a doubt.
that said, each option has its own pro and cons.

Race Chip:
30-45 minute install
pre-set maps that work with almost any setup
you can change the maps without having to pay for the Bluetooth app, as the tuner has buttons that allow map changing.


Jb4
45 minutes to 1-hour install
pre-set map for each octane, so you need to stick to your recommended map and cannot raise or lower the boost unless you use their custom map
the Bluetooth device is a must to use the additional jb4 settings or map-changing
its got better failsafe to protect your engine
datalogging, code reading and deleting
boost by gear and by RPM for better traction control and delivery
and a lot more features

[Ashwin34]

Originally Posted by mike@x-ph.com

the better option is the Jb4, its the more capable tunes without a doubt.
that said, each option has its own pro and cons.

Race Chip:
30-45 minute install
pre-set maps that work with almost any setup
you can change the maps without having to pay for the Bluetooth app, as the tuner has buttons that allow map changing.


Jb4
45 minutes to 1-hour install
pre-set map for each octane, so you need to stick to your recommended map and cannot raise or lower the boost unless you use their custom map
the Bluetooth device is a must to use the additional jb4 settings or map-changing
its got better failsafe to protect your engine
datalogging, code reading and deleting
boost by gear and by RPM for better traction control and delivery
and a lot more features

Does the boost by RPM allow you to access more low-end torque before 3000 RPM? Not too familiar with tuning but from my test drives the one thing that I was always wanting more of in the manual was little more acceleration.

[mike@x-ph.com]

Originally Posted by Ashwin34

Does the boost by RPM allow you to access more low-end torque before 3000 RPM? Not too familiar with tuning but from my test drives the one thing that I was always wanting more of in the manual was little more acceleration.

you can set a target boost at a lower RPM, but if its too high, the turbo will not have time to reach the target boost.

this feature is used to control the boost curve if you are looking for smoother delivery than what the off-the-shelf map offers

[rons e92]

I had a JB4 on my G42, then I got a Racechip GTS Black for my G87. I've since removed that and had the ECU unlocked.

Dollar for dollar, the Racechip is the best mod you can do for these cars if you want more power. It's relatively easy to install, you're not messing around with a million settings, and it just works.

The JB4, while I recognize its additional capabilities, is really made for guys who like to tinker with a piggyback. If you want to tinker, go that route.

If you want similar performance on 93 without messing with a million settings, go Racechip and save a few bucks.

Also worth noting, no matter what I did, my car never felt like it ran right with the JB4. I tried maps 1,2, and I think 5 and 6. When you start reading about additive vs absolute boost targets between the maps, and all the conflicting posts suggesting one is for G chassis and one is not, it really can become overwhelming.

I tried them all, although I never was comfortable enough to put ethanol in the car. (For context, the first thing I did when GTP sent me the map for my G87 was go out ethanol in the car). My best time was 11.1 @ 118mph in the quarter on the JB4 with an AA DP and Eventuri intake. I never ran the M240 with a racechip, so I can't compare.

I will say this, my G87 consistently trapped 140.xx at Racemotive (1/3rd mile roll race from under 64.99mph start speed). There was a G82 at the same event running the Dahler unit and his best trap speed was 137.xx that day. Didn't get a chance to talk to anyone running a JB4, but it would have been an interesting race.

[jchamp922]

I just want to run 93 for now. Can you use all the maps on the Racechip GTS. Ron E92 where did you go for unlock and tune?

[rons e92]

Originally Posted by jchamp922

I just want to run 93 for now. Can you use all the maps on the Racechip GTS. Ron E92 where did you go for unlock and tune?

I put my RaceChip on map 7 and never turned it off until I removed it from the car. Never used anything other then Shell 93.

GTP Motorsports helped me through the unlock process. I paid them, they sent me a label, and I dropped off the ECU. I dropped it off on a Saturday, DHL got it Monday, and I had it back on Thursday. 4 day turnaround time.

[Ruebarb]

The gains on these piggy back aren't impressive, compared to a tune. 27-30HP is all you are going to get, seen with a custom map 6 JB4. They will state 60HP, but they do car dealer math, they take the new HP and then subtract the listed HP, not the actual HP before the piggy back, inflating the gains, as though it was from the piggy back. As we've seen, many stock-ish can make 400-420. Losing my warrranty over 30HP, doesn't seem worth it. Going Femto would be reasonable if we didn't lose the OTA. We'll see how the scene looks in 2026 when the warranty is done, hopefully mission tune can break the 2021+ free with their impressive ECU back-up and restore tool.

[BG42]

Originally Posted by Ruebarb

The gains on these piggy back aren't impressive, compared to a tune. 27-30HP is all you are going to get, seen with a custom map 6 JB4. They will state 60HP, but they do car dealer math, they take the new HP and then subtract the listed HP, not the actual HP before the piggy back, inflating the gains, as though it was from the piggy back. As we've seen, many stock-ish can make 400-420. Losing my warrranty over 30HP, doesn't seem worth it. Going Femto would be reasonable if we didn't lose the OTA. We'll see how the scene looks in 2026 when the warranty is done, hopefully mission tune can break the 2021+ free with their impressive ECU back-up and restore tool.

Watched this a bit ago was kinda weird it almost seemed slower than stock with it on.That guy has had some issues with it though I think.

[vTuga]

I'm also considering this 2 options (JB4 and Racechip) for my m240i when it arrives.

From what I read, Racechip seems to be the better option for me. It's already "tuned" to the m240i. The video they show on their youtube channel also includes a dyno result before and after, and the result seems pretty good, very progressive rise in torque in the low end, and then it keeps it all over the RPM range.

The JB4 seems like it has more advanced features, and logging capabilities, but it more like a tool than a plug and play tune. The maps for the m240i are the same as any other B58 engine, so it might cause issues (like the potential overboosting is additive maps). And going for the conservative maps in JB4 (map 4 absolute target) probably is not going to result in the best feeling driving experience.

So unless you like to tinker, do logging, and go for a Custom Map in the JB4, I think the Racechip is a better "plug and play" stage 1 tune.

[Ruebarb]

Originally Posted by BG42

Watched this a bit ago was kinda weird it almost seemed slower than stock with it on.That guy has had some issues with it though I think.

I've seen dyno videos of the supra with the JB4 running non custom maps, they lost 20HP. It was repeatable.

[mike@x-ph.com]

Originally Posted by Ruebarb

I've seen dyno videos of the supra with the JB4 running non custom maps, they lost 20HP. It was repeatable.

I'm sorry, but losing HP from adding boost does not make any sense.

The unit is either defective or it's not installed properly

[VegasG42]

Originally Posted by BG42

Watched this a bit ago was kinda weird it almost seemed slower than stock with it on.That guy has had some issues with it though I think.

I watched the same video. Not to be disrespectful - but the M240i got obliterated by the M2.

Not the same results we've seen from other M2 vs. M240i videos posted online.

It is obvious that the M240i isn't getting anywhere near the supposed
claimed hp gains from the RaceChip.

I would immediately take the RaceChip out and run the M2 again to see the results.

And honestly , if you aren't going to do before and after dynos of your piggyback tune , then you're always just speculating at how much extra power you're making.

And who knows - maybe these piggyback tunes work intermittently.

But I don't know , some people swear by them.

[VegasG42]

Originally Posted by Ruebarb

I've seen dyno videos of the supra with the JB4 running non custom maps, they lost 20HP. It was repeatable.

I would be interested in watching , if you still remember the video title , channel , or link.

[vTuga]

Originally Posted by VegasG42

I watched the same video. Not to be disrespectful - but the M240i got obliterated by the M2.

Not the same results we've seen from other M2 vs. M240i videos posted online.

It is obvious that the M240i isn't getting anywhere near the supposed
claimed hp gains from the RaceChip.

I would immediately take the RaceChip out and run the M2 again to see the results.

And honestly , if you aren't going to do before and after dynos of your piggyback tune , then you're always just speculating at how much extra power you're making.

And who knows - maybe these piggyback tunes work intermittently.

But I don't know , some people swear by them.

You dont need to dyno your car, you can measure it other ways. Draggy for instance is a great way to measure progress.

Racechip has a 100-200 test of their chip on the m240i, and it goes from 9.9s to 8.9s, pretty much in line with what is expected from a 10% increase in HP.

If one installs the racechip and the performance is not there, then there is something wrong.

[VegasG42]

Originally Posted by vTuga

You dont need to dyno your car, you can measure it other ways. Draggy for instance is a great way to measure progress.

Racechip has a 100-200 test of their chip on the m240i, and it goes from 9.9s to 8.9s, pretty much in line with what is expected from a 10% increase in HP.

If one installs the racechip and the performance is not there, then there is something wrong.

Very good point.

Draggy runs, and 1/4 mile track runs will tell the story. Before and after. And trap speed improvements will show if your car is getting faster.

[vTuga]

Another point to consider. Found this video of a dyno test of the m240i running JB4 map 4 and map 5 on E30. But the guy isn't stock, he has a AA catted downpipe and Dinan intake.

Map 4 is 398 whp
Map 5 is 432 whp

The racechip gets 379 whp with map 7 on a stock m240i with RON 98 (93 US), according to their video.

With this data I would say racechip is probably at least equivalent to map 4 of the JB4, if you discount the effect of the better fuel, downpipe and intake.