RE: G-Power tunes new BMW Z4 to 500hp

RE: G-Power tunes new BMW Z4 to 500hp

Monday 8th July

G-Power tunes new BMW Z4 to 500hp

It's hard to imagine many BMW buyers needing it; Supra drivers, however...



If there's one tangible positive to the proliferation of turbocharged cars now offered to customers, it's their relatively simple tunability. Huge gains never possible with natural aspiration can be had with induction, exhaust and ECU tweaks, which is almost exactly what's happened with this G-Power BMW Z4.

With the addition of a Performance Software V2 map, new downpipes, sports cats, a bigger intercooler and a modified turbo, the Z4 M40i makes 500hp and 516lb ft. Noticeable tweaks, sure, but not a huge amount to yield another 160hp and 147lb ft over standard. As G-Power itself notes, "even the BMW Z4 M will not produce that many horses. If it'll be realised at all..."


Unsurprisingly, G-Power also recommends a top speed de-limit to fully exploit the Z4's potential; it's said to be capable of 186mph "and beyond" once unshackled from the software. There seems to be little beyond a set of forged wheels to improve the Z4 chassis wise, though G-Power does maintain that the aircraft-grade aluminium rims "lower the unsprung weight for improved acceleration, handling and braking." Capable though the Z4 has proven itself already, this sort of improved performance should probably be supported by some additional braking power at least. And maybe some suspension changes. And tyres...

Then we're into tuning, which inevitably means talking about the Supra this Z4 shares so much with. Presumably G-Power could do just the same with the Toyota as with the BMW, the resulting Supra arguably more interesting to enthusiasts than the equivalent Z4. Still, 500hp is 500hp, whichever form it comes in - G-Power's Z4 upgrades are available to order now.





Author
Discussion

sidesauce

Original Poster:

963 posts

161 months

Monday 8th July
quotequote all
And so it begins...evil

Not the best aftermarket wheels I've ever seen but, to be fair, not the worst either!

dibblecorse

4,936 posts

135 months

Monday 8th July
quotequote all
It's hard to imagine many BMW buyers needing it; Supra drivers, however...

Why ??????

5harp3y

1,327 posts

142 months

Monday 8th July
quotequote all
Because of the deluded journalistic view that all supra owners modified their cars. Which obviously didn't happen when they were new

Bet their are more bmw owners right now modifying* their cars than Toyota owners.

  • Modifying in 2019 is a remap and maybe induction kit along with bmw performance bolt on tinsel

J4CKO

27,677 posts

143 months

Monday 8th July
quotequote all
dibblecorse said:
It's hard to imagine many BMW buyers needing it; Supra drivers, however...

Why ??????
What about all those tuned M140i's ?

This isnt new, the B58 has been around since 2016 and has had various tuning options emerge.

With a tuning box people are seeing between 415 and 440 bhp, so can see how with supporting mods it will do 500.

They arent that far off the M4 engine design wise, same capacity, closed deck block, forged crank etc. The B58 just has a single turbo and can struggle with track work as it doesnt have the S55 engines baffled sump for high G loads so the engines get starved of oil on track and can expire.

But, apparently its not as good as a 2JZ, but nobody has actually give any technical details as to why ? Am really interested to know, it may be the case. Be interesting to see where they take it, and whether it can make over 1000 bhp ? might be being an alloy block it wont put up with as much ?


dibblecorse

4,936 posts

135 months

Monday 8th July
quotequote all
J4CKO said:
dibblecorse said:
It's hard to imagine many BMW buyers needing it; Supra drivers, however...

Why ??????
What about all those tuned M140i's ?

This isnt new, the B58 has been around since 2016 and has had various tuning options emerge.

With a tuning box people are seeing between 415 and 440 bhp, so can see how with supporting mods it will do 500.

They arent that far off the M4 engine design wise, same capacity, closed deck block, forged crank etc. The B58 just has a single turbo and can struggle with track work as it doesnt have the S55 engines baffled sump for high G loads so the engines get starved of oil on track and can expire.

But, apparently its not as good as a 2JZ, but nobody has actually give any technical details as to why ? Am really interested to know, it may be the case. Be interesting to see where they take it, and whether it can make over 1000 bhp ? might be being an alloy block it wont put up with as much ?
Agreed, thats why I was surprised by the headline that alludes to only Supra owners being interested in the tunability ....

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J4CKO

27,677 posts

143 months

Monday 8th July
quotequote all
dibblecorse said:
J4CKO said:
dibblecorse said:
It's hard to imagine many BMW buyers needing it; Supra drivers, however...

Why ??????
What about all those tuned M140i's ?

This isnt new, the B58 has been around since 2016 and has had various tuning options emerge.

With a tuning box people are seeing between 415 and 440 bhp, so can see how with supporting mods it will do 500.

They arent that far off the M4 engine design wise, same capacity, closed deck block, forged crank etc. The B58 just has a single turbo and can struggle with track work as it doesnt have the S55 engines baffled sump for high G loads so the engines get starved of oil on track and can expire.

But, apparently its not as good as a 2JZ, but nobody has actually give any technical details as to why ? Am really interested to know, it may be the case. Be interesting to see where they take it, and whether it can make over 1000 bhp ? might be being an alloy block it wont put up with as much ?
Agreed, thats why I was surprised by the headline that alludes to only Supra owners being interested in the tunability ....
Yeah, I suppose that the Z4 is perhaps more genteel and will be a less hardcore ownership profile ?

Which is more model, not make specific as M140i owners seem to be all over the tuning options.

I went in a 450 bhp and it was rapid, but they are already struggling a bit to deploy the power as standard.

Baddie

334 posts

160 months

Monday 8th July
quotequote all
It will be interesting to see if the B58 is as tough as the 2JZ. Ally blocks might be less strong, but have better heat rejection. BMW really did seem to build it with strength in mind, and apparently were receptive to feedback from Toyota about component durability. Toyota engineers were surprised how much BMW spent developing the engine, BMW engineers were surprised how exacting the Toyota guys were about the quality of every part.

Was the 2JZ so impressive just because of the TLC really high output projects get, or because the engine was actually bombproof? Doesn’t sound like BMW has cut any corners (forged crank etc). Will the ZF cope with all this extra energy?

mat205125

15,598 posts

156 months

Monday 8th July
quotequote all
I think that trying to pin down the number or type of people modding their cars is a pointless exercise.

The logic that people who will buy and drive a Supra are more likely to be looking for enhancements, rather than a regular Z4 driver is perfectly sound in my option.

Sure, there are loads of BMW owners out their modding their 140s and M cars, however without actually doing a census, I think it's reasonable to conclude that it's a larger number of the saloon and hatch buyers than it is the Z4 roadster owners.

Supra has been deliberately designed with modding in mind, e.g. provision for bonnet and wing vents, and pre-reinforced tailgate ready to accept a wing. As similar as the underpinnings of the cars might be (massively over simplified in most stories or posts), the demographic buying them and their associated "culture" is very different.

E65Ross

22,765 posts

155 months

Monday 8th July
quotequote all
Baddie said:
Will the ZF cope with all this extra energy?
The 8 speed box is already in cars with over 500lbft smile

xjay1337

12,083 posts

61 months

Monday 8th July
quotequote all
J4CKO said:
They arent that far off the M4 engine design wise, same capacity, closed deck block, forged crank etc. The B58 just has a single turbo and can struggle with track work as it doesnt have the S55 engines baffled sump for high G loads so the engines get starved of oil on track and can expire.
1) B58 engine doesn't suffer with oil starvation issues, it has a similar design to the S55, upgraded from the N55, with twin pick ups and baffling and windage trays
2) N55 in the FXX series cars also has windage trays and some baffling, only the one pick up - you hear the odd issue of oil starvation but it's very rare and certainly not something I have experienced on 8 track days with mine nor is it a particularly widely reported issue in cars that actually race (EG Bathurst 24 hr endurance team running an N55 ran it 0.5L over with no issues for the entire race!)


Sorry, bit of a pet peeve when people go "every bmw used on track has oil starvation!//!11one!11/" - when this is simply not the case.

Completely true however, the B58 tuning is nothing new and you can do it for a lot less than G-Power is charging.

J4CKO

27,677 posts

143 months

Monday 8th July
quotequote all
xjay1337 said:
J4CKO said:
They arent that far off the M4 engine design wise, same capacity, closed deck block, forged crank etc. The B58 just has a single turbo and can struggle with track work as it doesnt have the S55 engines baffled sump for high G loads so the engines get starved of oil on track and can expire.
1) B58 engine doesn't suffer with oil starvation issues, it has a similar design to the S55, upgraded from the N55, with twin pick ups and baffling and windage trays
2) N55 in the FXX series cars also has windage trays and some baffling, only the one pick up - you hear the odd issue of oil starvation but it's very rare and certainly not something I have experienced on 8 track days with mine nor is it a particularly widely reported issue in cars that actually race (EG Bathurst 24 hr endurance team running an N55 ran it 0.5L over with no issues for the entire race!)


Sorry, bit of a pet peeve when people go "every bmw used on track has oil starvation!//!11one!11/" - when this is simply not the case.

Completely true however, the B58 tuning is nothing new and you can do it for a lot less than G-Power is charging.
Ah ok, have got my wires crossed on the oil starvation thing.

Amazing now you can pick up a M140i for 20 grand or thereabouts, spend a grand or so and have a 450 bhp car.


Dave Hedgehog

10,336 posts

147 months

Monday 8th July
quotequote all
dibblecorse said:
It's hard to imagine many BMW buyers needing it; Supra drivers, however...

Why ??????
supra drivers will be 'only 500???'

dibblecorse

4,936 posts

135 months

Monday 8th July
quotequote all
mat205125 said:
I think that trying to pin down the number or type of people modding their cars is a pointless exercise.

The logic that people who will buy and drive a Supra are more likely to be looking for enhancements, rather than a regular Z4 driver is perfectly sound in my option.

Sure, there are loads of BMW owners out their modding their 140s and M cars, however without actually doing a census, I think it's reasonable to conclude that it's a larger number of the saloon and hatch buyers than it is the Z4 roadster owners.

Supra has been deliberately designed with modding in mind, e.g. provision for bonnet and wing vents, and pre-reinforced tailgate ready to accept a wing. As similar as the underpinnings of the cars might be (massively over simplified in most stories or posts), the demographic buying them and their associated "culture" is very different.
You'd be surprised, loads of owners over on the Z4 specific forums undertaking the same remapping being taken advantage of by the 135/40 mob and enjoying the extra horses ....

Mackofthejungle

828 posts

138 months

Monday 8th July
quotequote all
Baddie said:
BMW really did seem to build it with strength in mind, and apparently were receptive to feedback from Toyota about component durability. Toyota engineers were surprised how much BMW spent developing the engine, BMW engineers were surprised how exacting the Toyota guys were about the quality of every part.
Where do people find this drivel?!

Baddie

334 posts

160 months

Monday 8th July
quotequote all
Mackofthejungle said:
Baddie said:
BMW really did seem to build it with strength in mind, and apparently were receptive to feedback from Toyota about component durability. Toyota engineers were surprised how much BMW spent developing the engine, BMW engineers were surprised how exacting the Toyota guys were about the quality of every part.
Where do people find this drivel?!
Was on a You Tube video about the development of the Supra, including interviews with the Toyota engineers. It specifically addressed the suitability of the B58 for, what is intended to be, a tuner’s car. BMW sent parts to Japan and Toyota returned them after testing them in a mutually cooperative engineering exercise where both companies learnt something. So when Tada san describes the B58 as “legendary” he’s qualified to do so.

The ZF 8HP is supplied in different torque ratings, it would be interesting to know which one is bolted to the B58 here.

Chestrockwell

1,683 posts

100 months

Monday 8th July
quotequote all
E65Ross said:
Baddie said:
Will the ZF cope with all this extra energy?
The 8 speed box is already in cars with over 500lbft smile
That’s a good question re the ZF. I refrained form remapping my 430d as I heard the gearbox can’t handle more than 500lbft if torque.

Some people may have more and it’s fine but it wasn’t a risk I was willing to take. I’m guessing tuners will really go mad when they offer the Supra and BMW with a manual.

J4CKO

27,677 posts

143 months

Monday 8th July
quotequote all
Chestrockwell said:
E65Ross said:
Baddie said:
Will the ZF cope with all this extra energy?
The 8 speed box is already in cars with over 500lbft smile
That’s a good question re the ZF. I refrained form remapping my 430d as I heard the gearbox can’t handle more than 500lbft if torque.

Some people may have more and it’s fine but it wasn’t a risk I was willing to take. I’m guessing tuners will really go mad when they offer the Supra and BMW with a manual.
They seem to hold together pretty well, loads out there from broken cars for £400 or less just in case, but aside from some whining in reverse not hear of any issues, seems to be pretty tough.

xjay1337

12,083 posts

61 months

Monday 8th July
quotequote all
Baddie said:
The ZF 8HP is supplied in different torque ratings, it would be interesting to know which one is bolted to the B58 here.
I would imagine it's the ZF8HP45 which is rated to 450NM I believe.
However as with many things you can run much higher than this without issue.
Many cars run 600nm+ for tens of thousands of miles without issue.

You can get XHP gearbox software for increased clamping pressure (I have stage 3 software on mine, it's brilliant).

And like a DSG gearbox it needs regular servicing (this is not mentioned in any service routine in BMW)
I would recommend every 40-50k. It doesn't cost that much. 300-400 tops.

British Beef

1,193 posts

108 months

Monday 8th July
quotequote all
xjay1337 said:
Baddie said:
The ZF 8HP is supplied in different torque ratings, it would be interesting to know which one is bolted to the B58 here.
I would imagine it's the ZF8HP45 which is rated to 450NM I believe.
However as with many things you can run much higher than this without issue.
Many cars run 600nm+ for tens of thousands of miles without issue.

You can get XHP gearbox software for increased clamping pressure (I have stage 3 software on mine, it's brilliant).

And like a DSG gearbox it needs regular servicing (this is not mentioned in any service routine in BMW)
I would recommend every 40-50k. It doesn't cost that much. 300-400 tops.
How the car and gearbox is used will also have a huge bearing on its life expectancy.
A 600nm engine will do less harm used for general street driving and outlast say 450nm used for regular full power standing starts and track days.


HM-2

4,497 posts

112 months

Monday 8th July
quotequote all
Baddie said:
Was the 2JZ so impressive just because of the TLC really high output projects get, or because the engine was actually bombproof?
The whole mythos around the 2JZ is just that, really. ~600hp (and 200bhp per litre) on stock internals is impressive, but like other equally capable engines of its era, it's a pretty heavy thing. Modern engines can and have done the same, both in tuned for and (in the case of the latter figure) from the factory. There are US BMW B58 engines making ~560whp with just a stage 3 turbo, JB4, exhaust and intake. More with water/meth.

I think the main reason for its continued allure is relative availability (tens, possibly hundreds of thousands of engines out there- circa 50k Mk4 Supras (split between turbo and non-turbo) plus the various other cars that the 2JZ-GTE went into) and the relative availability of well regarded upgrades for them. The RB26DETT is similar in that it found its way into at least 80k GT-Rs across three generations, plus other edge uses.

Edited by HM-2 on Monday 8th July 16:21