[IHateBrakeDust]

I have some questions for those who have done a jb4 on the G87 m2.

I am debating about doing a fetmo unlock and tune but I am only doing a downpipe and intake. Not messing around with e85 or flex fuel kits. I know there's a lot on the forums on the jb4 with these engines but specifically with our detuned s58 cars compared to the g80s I didn't see much.

Does the jb4 on the g87 make the same power as the G80 with a jb4

How does it effect the lower end torque. The dyno sheets for the g80s are tuned differently than our g87s and was wondering how the jb4 effects this.

For those who have tuned their cars without doing a e85 or flex fuel how much different was it from the jb4 to the tune. Does it get that much more power.

Not talking about comparing price or warranty stuff Ive read everyone's opinions about that already. I want to know how much better does it run and does it change the torque curve to be like the m3/m4. Hope that makes sense.

[M_Power Rob]

A femto unlock, stage 2 tune, downpipes, exhaust, heat exchanger, oil cooler, trans cooler, intake/drop in filter and colder plugs on 93 octane will get you 700-750whp/600-650wtq depending on who does the tune. No, its not cheap and not for everyone.

JB4 cannot touch this.

[IHateBrakeDust]

Peak hp is awesome with 700 but I'm looking to beef up the mid range mainly from 3 k and up as the stock top end is decent. Does the jb4 vs tune go about this differently.

[M.Falcon]

Originally Posted by M_Power Rob

A femto unlock, stage 2 tune, downpipes, exhaust, heat exchanger, oil cooler, trans cooler, intake/drop in filter and colder plugs on 93 octane will get you 700-750whp/600-650wtq depending on who does the tune. No, its not cheap and not for everyone.

JB4 cannot touch this.

Now this is what I live for. Trans cooler is only for Automatic right? for Manual you gotta upgrade the clutch is what I hear.

[M_Power Rob]

Originally Posted by M.Falcon

Now this is what I live for. Trans cooler is only for Automatic right? for Manual you gotta upgrade the clutch is what I hear.

Correct, trans cooler is for auto. Keeping everything as cool as possible is one of the keys. I don't recommend meth injection (like a snow, etc)...want to run methanol, go with an E85 setup.

You can upgrade the clutch and pressure plate for the manual but the manual honestly is the limiting factor for the power. It cannot handle the same amount of power (hp/tq) as the auto can.

[M.Falcon]

Originally Posted by M_Power Rob

Correct, trans cooler is for auto. Keeping everything as cool as possible is one of the keys. I don't recommend meth injection (like a snow, etc)...want to run methanol, go with an E85 setup.

You can upgrade the clutch and pressure plate for the manual but the manual honestly is the limiting factor for the power. It cannot handle the same amount of power (hp/tq) as the auto can.

Yeah I am aware that I will never make big power from the manual. I just wanted like 650-700 if its doable and then just have a fun car since I work from home. I also plan on hitting a track maybe 3 times a year.

Thank you for all of the information!

[mike@x-ph.com]

If the goal is to make the most power, bootmod3 is better than the Jb4.

But if you have a daily driver and are looking for a big jump in power at a lower cost, the JB4 is the better value. It makes power with a lot less hassle since you do not need to send your DME to Finland, and it costs way less.

[IHateBrakeDust]

Makes sense thank you. I was looking more for the way the power is delivered vs the total power. I believe the tune would make the power curve different than a jb4 correct me if I'm wrong. If that is true then I will do a tune just without the ethanol and flex fuel kit.

A tune with 93 octane vs a jb4 with 93 octaine. No flex fuel or ethanol just down pipe and intakes. Tune would be better or not worth it with just those upgrades. Will consider adding the oil cooler if it makes difference. That's what I'm chasing

[mike@x-ph.com]

Originally Posted by IHateBrakeDust

Makes sense thank you. I was looking more for the way the power is delivered vs the total power. I believe the tune would make the power curve different than a jb4 correct me if I'm wrong. If that is true then I will do a tune just without the ethanol and flex fuel kit.

A tune with 93 octane vs a jb4 with 93 octaine. No flex fuel or ethanol just down pipe and intakes. Tune would be better or not worth it with just those upgrades. Will consider adding the oil cooler if it makes difference. That's what I'm chasing

the flash tune is always better and provides more power on any setup. whether its worth it or not is a personal decision.

On my G82 rear-wheel drive, I did not want max power because traction was an issue, so I went with the JB4. It's a lot faster than stock.

I just got an X-drive, and I want to target a lot more target and later get an upgraded turbo, I'm getting bootmod3 on this car.

[IHateBrakeDust]

Perfect just what I wanted to hear. Thank everyone.

[mike@x-ph.com]

Originally Posted by IHateBrakeDust

Perfect just what I wanted to hear. Thank everyone.

[k-m2-j442]

This is not for the S58, but I had a JB4 in my B58 supra. When I dynod it with a custom map, AA catted DP, and intake I was up 60lbft of torque - from 412 to 472. I don't have reliable HP numbers because I was a dummy and did 3 stock (JB4 disabled) pulls and then 3 map6 (custom map) pulls. The shop didn't let it cool down enough between runs and I suspect it pulled timing at top end so my HP didn't change. (I also forgot to log the runs). My guess and based on what I saw from others it should be around 420hp.
So for about $1000 total (jb4 + custom map) I was able to go from 377HP/412tq to 420HP/472Tq.

As everyone else said - JB4 < a proper unlock and tune but when I did this Femto wasn't available (or it was like a lot more challenging to send it as they were in russia, I forget)

[M_Power Rob]

Originally Posted by Kmj442

This is not for the S58, but I had a JB4 in my B58 supra. When I dynod it with a custom map, AA catted DP, and intake I was up 60lbft of torque - from 412 to 472. I don't have reliable HP numbers because I was a dummy and did 3 stock (JB4 disabled) pulls and then 3 map6 (custom map) pulls. The shop didn't let it cool down enough between runs and I suspect it pulled timing at top end so my HP didn't change. (I also forgot to log the runs). My guess and based on what I saw from others it should be around 420hp.
So for about $1000 total (jb4 + custom map) I was able to go from 377HP/412tq to 420HP/472Tq.

As everyone else said - JB4 < a proper unlock and tune but when I did this Femto wasn't available (or it was like a lot more challenging to send it as they were in russia, I forget)

Femto was in the Ukraine....obviously why they relocated.

[IHateBrakeDust]

I had a mission performance unlocked tune on my b58 and it was much more than that or at least it felt like it. Felt like that curve for the torque and HP was much different than the stock map which made it better to drive. That's why I'm asking more about the curve of the graph changes from a jb4 to a full tune rather than just more power. But I got my answer from everyone here.

[k-m2-j442]

Originally Posted by M_Power Rob

Femto was in the Ukraine....obviously why they relocated.

I really think it was russia in the beginning because one of the guys on the supra forums started a website: https://willmy062020plusecugotorussia.com/

either way...yes they relocated to Finland

[M_Power Rob]

Originally Posted by Kmj442

I really think it was russia in the beginning because one of the guys on the supra forums started a website: https://willmy062020plusecugotorussia.com/

either way...yes they relocated to Finland

Yes, may have been Russia. I had Ukraine on the brain when I was typing.

[mike@x-ph.com]

Originally Posted by IHateBrakeDust

I had a mission performance unlocked tune on my b58 and it was much more than that or at least it felt like it. Felt like that curve for the torque and HP was much different than the stock map which made it better to drive. That's why I'm asking more about the curve of the graph changes from a jb4 to a full tune rather than just more power. But I got my answer from everyone here.

What are you going to get?

[IHateBrakeDust]

It won't be until after so far I'm leaning towards a tune 😁

[702MoxyBMW]

Originally Posted by k-m2-j442

This is not for the S58, but I had a JB4 in my B58 supra. When I dynod it with a custom map, AA catted DP, and intake I was up 60lbft of torque - from 412 to 472. I don't have reliable HP numbers because I was a dummy and did 3 stock (JB4 disabled) pulls and then 3 map6 (custom map) pulls. The shop didn't let it cool down enough between runs and I suspect it pulled timing at top end so my HP didn't change. (I also forgot to log the runs). My guess and based on what I saw from others it should be around 420hp.
So for about $1000 total (jb4 + custom map) I was able to go from 377HP/412tq to 420HP/472Tq.

As everyone else said - JB4 < a proper unlock and tune but when I did this Femto wasn't available (or it was like a lot more challenging to send it as they were in russia, I forget)

This is in the area I got from my dyno. I don't have 93 octane here so I actually did a 4-5 gallons of 100 octane with 91 to get better fuel for it. My torque number was high but hp was at best 420-425 I think. To be honest, I didn't feel tons of difference but I did find the car took time adjust to the maps and drive differently. I recently added my AA downpipe with hi flow cats. I honestly wish I could just flash the car and be done with it. I am not as convinced its as good with the piggyback.

[GT3M2]

Originally Posted by M_Power Rob

A femto unlock, stage 2 tune, downpipes intake/drop in filter and colder plugs on e85 octane will get you 700-750whp/600-650wtq depending on who does the tune.

JB4 cannot touch this.

Fixed!

Corrections in bold.

Unless you can cite 700 whp 93 octane dynos?

-GT3M2

[GT3M2]

Originally Posted by IHateBrakeDust

Makes sense thank you. I was looking more for the way the power is delivered vs the total power. I believe the tune would make the power curve different than a jb4 correct me if I'm wrong. If that is true then I will do a tune just without the ethanol and flex fuel kit.

A tune with 93 octane vs a jb4 with 93 octaine. No flex fuel or ethanol just down pipe and intakes. Tune would be better or not worth it with just those upgrades. Will consider adding the oil cooler if it makes difference. That's what I'm chasing

Femto with proper tune or even its map far better even at minimal mod levels.

Don’t go femto for any other reason other than you’re not tricking the ecu into seeing 10psi less boost than actual.

-GT3M2