[neilvan]

Short version: My daily is the 335 sedan. Full FBO + inlets/outlets and a JB4+BEF. I also have meth waiting to be installed when I get around to screwing with it.

I installed some RB oem replacements when fixing the wastegates 1.5 years ago. My father also has a E90 335 and we just grabbed some RB ones as a good deal to replace them. He is also FBO and the turbos came with inlets.

He really has no need for the bigger turbos as the car is quick as is for him. I can do the labour/work no problem; Just is there any real benefit of going up to the ones or are the gains that minimal? Its my daily and I do have faster cars (the miata) and I don't really want to be breaking things/dealing with fueling issues or making the car less reliable.

[Saif2018]

Originally Posted by neilvan

Short version: My daily is the 335 sedan. Full FBO + inlets/outlets and a JB4+BEF. I also have meth waiting to be installed when I get around to screwing with it.

I installed some RB oem replacements when fixing the wastegates 1.5 years ago. My father also has a E90 335 and we just grabbed some RB ones as a good deal to replace them. He is also FBO and the turbos came with inlets.

He really has no need for the bigger turbos as the car is quick as is for him. I can do the labour/work no problem; Just is there any real benefit of going up to the ones or are the gains that minimal? Its my daily and I do have faster cars (the miata) and I don't really want to be breaking things/dealing with fueling issues or making the car less reliable.

Did I read that right,

Your miata is faster than FBO N54?

lol

[neilvan]

Originally Posted by Saif2018

Did I read that right,

Your miata is faster than FBO N54?

lol

Correct, Substantially faster lol

Miata is ~350whp on a conservative tune and weighs just over 2100lbs. FBO 335 on stock turbos might hit 400/420whp and my rwd manual version weighs 3600lbs. Besides the feeling/ burying the speedo; the math supports it.

Also both cars run 91 Octane

[mweisdorfer]

Originally Posted by neilvan

Short version: My daily is the 335 sedan. Full FBO + inlets/outlets and a JB4+BEF. I also have meth waiting to be installed when I get around to screwing with it.

I installed some RB oem replacements when fixing the wastegates 1.5 years ago. My father also has a E90 335 and we just grabbed some RB ones as a good deal to replace them. He is also FBO and the turbos came with inlets.

He really has no need for the bigger turbos as the car is quick as is for him. I can do the labour/work no problem; Just is there any real benefit of going up to the ones or are the gains that minimal? Its my daily and I do have faster cars (the miata) and I don't really want to be breaking things/dealing with fueling issues or making the car less reliable.

If you get MHD you can use it to get a custom tune or use JB4 and make the adjustments from their flash. You need MHD to use JB4 for their flash

https://www.n54tech.com/forums/showthread.php?t=33200

You will need a custom tune either way. $350.00 minimum.

You will also need a stage 2 LPFP.

You should easily be able to make 475-500 hp on RB 1's with inlets & outlets.

Just make sure you are on Eldor Coils & NKG stage 2 plugs gapped at .018

I'd also make sure you have index 12 injectors

[Saif2018]

Originally Posted by neilvan

Correct, Substantially faster lol

Miata is ~350whp on a conservative tune and weighs just over 2100lbs. FBO 335 on stock turbos might hit 400/420whp and my rwd manual version weighs 3600lbs. Besides the feeling/ burying the speedo; the math supports it.

Also both cars run 91 Octane

Top end 335i will be faster, the miata just hasn't got the power.

0-60 will probably be faster against a rear wheel drive 335i.

[neilvan]

Originally Posted by Saif2018

Top end 335i will be faster, the miata just hasn't got the power.

0-60 will probably be faster against a rear wheel drive 335i.

I own the miata and we have 2 FBO N54 E90s(both have LSD's btw). The miata is faster in every regard lol; Its not even a contest. Its also on a conservative tune for track (I'm sure I could add a bit more boost and try to push the limits of the 1.8L but why)

[neilvan]

Originally Posted by mweisdorfer

If you get MHD you can use it to get a custom tune or use JB4 and make the adjustments from their flash. You need MHD to use JB4 for their flash

https://www.n54tech.com/forums/showthread.php?t=33200

You will need a custom tune either way. $350.00 minimum.

You will also need a stage 2 LPFP.

You should easily be able to make 475-500 hp on RB 1's with inlets & outlets.

Just make sure you are on Eldor Coils & NKG stage 2 plugs gapped at .018

I'd also make sure you have index 12 injectors

Thats the answer I was looking for. I do have the JB4 and back end flash so I could change them to suit the bigger turbos. I also do already have the colder NGK plugs.

Is the LPFP necessary? I might just dial back the boost a bit to start and see where I'm at before going that route. Fueling issues is not an area I want to dig into

[BSM n54iS]

Originally Posted by mweisdorfer

If you get MHD you can use it to get a custom tune or use JB4 and make the adjustments from their flash. You need MHD to use JB4 for their flash

https://www.n54tech.com/forums/showthread.php?t=33200

You will need a custom tune either way. $350.00 minimum.

You will also need a stage 2 LPFP.

You should easily be able to make 475-500 hp on RB 1's with inlets & outlets.

Just make sure you are on Eldor Coils & NKG stage 2 plugs gapped at .018

I'd also make sure you have index 12 injectors

I'm curious what makes you say .018 compared to .020?

And OP yes you'll want to look into a stage 2 lpfp soon enough after install at least, you will start to starve the hpfp keeping up from what I have gathered.

[stewbets]

I'm still curious about this Miata! What all does one need to replace on a vehicle that has almost 4 times the power it was designed for? Sounds like an absolute rocket to me with that power to weight ratio! You have any videos of it?

[neilvan]

Originally Posted by stewbets

I'm still curious about this Miata! What all does one need to replace on a vehicle that has almost 4 times the power it was designed for? Sounds like an absolute rocket to me with that power to weight ratio! You have any videos of it?

I am not the only one; there' actually many people making more power than me. Generally just forged pistons/rods and a well built turbo kit gets you 250-350whp in the 1.8L block(Engine was originally built for boost). Factory Torsen lsd helps with traction but beyond that power the transmission(6spd) can be dicey (funny enough the BMW E46 6spd is the solution). Then of course grip (15x9 w/ 245 track tires), brakes(big wilwoods), cooling and some good suspension so you can handle the power

Then again there's Honda K20/K24 or LS swaps if you're shooting for the moon. It by no means a good daily driver but if you want that real driving experience; I've yet to find anything better for even close the money

[Saif2018]

Originally Posted by neilvan

I own the miata and we have 2 FBO N54 E90s(both have LSD's btw). The miata is faster in every regard lol; Its not even a contest. Its also on a conservative tune for track (I'm sure I could add a bit more boost and try to push the limits of the 1.8L but why)

Only way that would be true is, if your FBO cars have issues


Otherwise 350whp will not win against 420whp top end.

A tuned Xdrive 335i will leave it for dust.

1.8 lamo

[neilvan]

Originally Posted by Saif2018

Only way that would be true is, if your FBO cars have issues


Otherwise 350whp will not win against 420whp top end.

A tuned Xdrive 335i will leave it for dust.

1.8 lamo

Please leave this thread up to the turbo discussion.

If you would like to discuss both my personal vehicles, my experience as a performance engine builder or physics(power to weight) my pm is always open.

[stewbets]

Originally Posted by Saif2018

Only way that would be true is, if your FBO cars have issues


Otherwise 350whp will not win against 420whp top end.

A tuned Xdrive 335i will leave it for dust.

1.8 lamo

Wow, this is a pretty ignorant post. At some point you've got to acknowledge that power to weight ratio means something. Would a 420whp school bus beat a 350whp motorcycle top end too? His Miata has about 6 pounds per hp compared to about 9 pounds per hp for an FBO 335i. This is a massive difference.

Also, you drive a turbocharged 3.0L engine (SO MASSIVE) and are displacement-shaming someone else? Why not leave that to the V8 NA crowd?

[Rule1977]

There is a reason why there are RB oem replacements, Rb Ones, RB Twos, RB Twos plus, Standard GF's and High Flow GF's..

Email Rob and he will most definitely give you an honest answer to your questions.. best N54 turbo builder bar none with the best customer service.

[woodex m.e.]

Lol, everyone is an expert.

[Saif2018]

Originally Posted by stewbets

Wow, this is a pretty ignorant post. At some point you've got to acknowledge that power to weight ratio means something. Would a 420whp school bus beat a 350whp motorcycle top end too? His Miata has about 6 pounds per hp compared to about 9 pounds per hp for an FBO 335i. This is a massive difference.

Also, you drive a turbocharged 3.0L engine (SO MASSIVE) and are displacement-shaming someone else? Why not leave that to the V8 NA crowd?

Power to weight ratio doesn't determine top end mate,

There have been several tests showing, that cars and bikes even against high performance cars which weigh a lot more,

initially the lower powered (higher power to weight ratio) vehicle out accelerates the high powered (lower power to weight ratio) car, such as 0-60, or 0-100 mph sprints, after that the heavier high performance car gains on it and beats it.

When did I ever say 3 litre was remotely massive? Facepalm, that's average size, if you really asking, the saying about there's no replacement for displacement does have a point.

I was referring to the massive turbo lag on a 1.8 that's been tuned to 350hp, and not the engine size itself, but thanks for jumping to conclusions and assuming otherwise.

XDrive 335i FBO's have done 0-60 in around 3.6 secs, how fast can a 350hp Miata do it, considering it doesn't have all wheel drive ?

[Emilime75]

Originally Posted by Saif2018

Power to weight

Just stop it already. Start another thread if you want to discuss power/weight.

Here's your homework assignment for that thread-assuming straight line only, and all else equal-
Car #1 @420WHP and 3600lbs
Car #2 @350WHP and 2100lbs
Which is faster to 60, 100, 130?

[Saif2018]

Originally Posted by Emilime75

Just stop it already. Start another thread if you want to discuss power/weight.

Here's your homework assignment for that thread-assuming straight line only, and all else equal-
Car #1 @420WHP and 3600lbs
Car #2 @350WHP and 2100lbs
Which is faster to 60, 100, 130?

Face-palm, cut and pasted my post and completely ignored what I said,

Nevermind.

[nicky dj]

Originally Posted by Saif2018

Only way that would be true is, if your FBO cars have issues


Otherwise 350whp will not win against 420whp top end.

A tuned Xdrive 335i will leave it for dust.

1.8 lamo

OMG here we go again with the e92 top end HP expert SMH 🤦with a guy who runs only a Stage 1 tune. Can you just stop?

I run an e50 tune stock turbos LPFP and I'd say your Miata with almost half the weight cut would smoke my E92 in every regard. You know what you run a 1/4 mile in?

[BSM n54iS]

You all know what this means right? Weight loss time for the e92!!





Also, let's respect the question. Is it worth it to switch to RB ones from stocks when you already have a faster stable of cars? I mean, no, probably not lol... unless you love doing the labor

[Emilime75]

Originally Posted by Saif2018

Face-palm, cut and pasted my post and completely ignored what I said,

Nevermind.

Correct, because it's foolish of you to tell the guy who actually owns and drives the cars what they can and cannot do, and this thread is not about your assumptions on the matter.

[mweisdorfer]

Originally Posted by BdSM n54iS

I'm curious what makes you say .018 compared to .020?

And OP yes you'll want to look into a stage 2 lpfp soon enough after install at least, you will start to starve the hpfp keeping up from what I have gathered.

I've read if you plan on running e30 to e50 you should gap to .018. If not, then I'd say .020 is perfect.

However, if you have hybrid turbos & a stage 2 LPFP, why wouldn't you run a some e30 or even e50 once in a while? That would 🤩