[rismo]

Originally Posted by Rule1977

Nailed it!

If people would just do the research it's all there. If you want big numbers (700 plus) go single. If that's not what you want then go with RB twins. He has the best twins on the market for everyone's power needs below 700 that's reliable and proven. Customer service is outstanding and the quality is as well.

I agree on that one.


Running 150k KM on RB's, somewhere around 500ish HP as daily.
I would be conservative when pushing this engine without serious upgrades post 600whp as a daily.

For a bit of fun and racing, you might get away without build and some good fueling.

ST vs Twin, there is a good purpose for a ST and there is good purpose for Twins. The original reason for twins is still valid, spool, however the ST's also have impressive spool these days. I do have the impression that a twin setup is slightly more agile, but I can be very wrong on that one ;-)

[Torgus]

Originally Posted by Vivek.

#5, the summary: because pricing is based on value not the cost of goods sold. All of the reasons you listed (especially #1) still point to a lower materials cost (1 vs 2 turbos; 1 vs 2 manifolds, off-the-shelf turbo vs engineered for n54, etc) but we can't realistically expect that to translate to a lower selling price. So even though a single setup seems like it could be the lower cost option there is a lot more value in terms of performance and reliability which means price goes up.

I agree to a degree To be fair, a precision turbo, which is the most popular with ST N54 kits, run around 2k. A nice garret roughly 2.5k. So basically 1/2 the kit's cost is the turbo alone. Then there is all the small other bits.

Cast manifolds and CHRAs in china are much less expensive to produce vs complicated hand welded manifolds in America.

A cast top mount turbo solution will be on the market soon from M18. I imagine it will be around the price of the speedtech kit.

You also get better MPG with a single not that anyone probably cares.

Originally Posted by iqraceworks

Those speedtech kits looks really nice, and it's also nice to have all the different turbo brand/size options.

If I wanted to jump up to a single turbo....but don't want to mess with PI or an upgraded HPFP.... what's a realistic and reliable hp goal? I have access to 93 fuel, and also e85.

500-550whp on 93 depending on turbo size. Unless you go with a huge turbo that can make say 1000whp on 100% E85 then you can hit more on pump alone.

550-700whp depending on how much meth you want to inject

550-1000whp with PI E85

Obviously the block and other components start to become an issue as the power increases. These are general numbers. If E85 access is readily available just go PI.

[Saif2018]

Getting just over 14mpg (combined) on stock turbos, how much better mpg is ST gonna give lol?

The N54 is just terrible on fuel consumption, regardless of what you do. The best I got was just under 20 mpg (combined city and highway) driving like a granny, then I thought what the heck am I doing driving an N54 like a granny?

[Torgus]

Originally Posted by Saif2018

Getting just over 14mpg (combined) on stock turbos, how much better mpg is ST gonna give lol?

A few mpg from my experience. Nothing huge.

[iqraceworks]

Mine actually does great for a 450+ hp car. I can get around 25mpg on the highway, maybe more if I take it easy on the speed. Hell, my 200hp mini cooper only gets around 28mpg on the highway....

[Smgs1992]

Only time i got good mpg was the day i bought it drove 4hrs home and averaged 27mpg then around 20-22mpg till i tuned it now i do 16-17mpg

[iqraceworks]

Originally Posted by Smgs1992

Only time i got good mpg was the day i bought it drove 4hrs home and averaged 27mpg then around 20-22mpg till i tuned it now i do 16-17mpg

Maybe your tune is running too rich in the light/mid throttle area? I'm on the MHD stage 2+ 93 tune and get great mpg (27-28). When I run the e40 tune, it drops to around 18 though.

[Smgs1992]

Originally Posted by iqraceworks

Maybe your tune is running too rich in the light/mid throttle area? I'm on the MHD stage 2+ 93 tune and get great mpg (27-28). When I run the e40 tune, it drops to around 18 though.

I’m thinking i need a walnut blast i’ve heard it might help a bit. I’m also a 6mt though and tend to keep my rpm’s around 2000+

[Saif2018]

Originally Posted by iqraceworks

Mine actually does great for a 450+ hp car. I can get around 25mpg on the highway, maybe more if I take it easy on the speed. Hell, my 200hp mini cooper only gets around 28mpg on the highway....

Yeah it's not bad if you mostly highway driving, but it's terrible in city driving.

[Saif2018]

Originally Posted by Smgs1992

I’m thinking i need a walnut blast i’ve heard it might help a bit. I’m also a 6mt though and tend to keep my rpm’s around 2000+

It does, but don't expect a huge difference.

[Saif2018]

Originally Posted by Smgs1992

Only time i got good mpg was the day i bought it drove 4hrs home and averaged 27mpg then around 20-22mpg till i tuned it now i do 16-17mpg

Depends a lot on how much city driving you do, if your smooth with the throttle and change up early etc, as well how often you ripping it.

[Smgs1992]

I dont do alot of highway driving so im sure that affects it i’m usually running around in 4-5th gear and of course rip on it a bit. I didnt buy it for mpg’s though so i’m not concerned about it but would be nice haha

[Soden82]

I'm going single turbo just from the horror stories I've read about aftermarket twins needing to be rebuilt. Unless you buy the RB or pure turbo setups.

I've pretty much decided to go bottom mount so I'm either going with the Speedtech kit or CES Motorsports. Big distinction of price between the two, but CES claims they have the best turbo kit on the market apparently.

I do think the doc race bottom mount is interesting, but unsure about the manifold design.

I'm curious about the m18 top mount setup when it finally comes to fruition.

But my vote is definitely single. Why not have a kit that will put less stress on the turbo, motor, and drivetrain components compared to a twin. Plus the benefit of a simpler setup when it comes to fixing things

[Torgus]

Originally Posted by Soden82

I'm going single turbo just from the horror stories I've read about aftermarket twins needing to be rebuilt. Unless you buy the RB or pure turbo setups.

I've pretty much decided to go bottom mount so I'm either going with the Speedtech kit or CES Motorsports. Big distinction of price between the two, but CES claims they have the best turbo kit on the market apparently.

I do think the doc race bottom mount is interesting, but unsure about the manifold design.

I'm curious about the m18 top mount setup when it finally comes to fruition.

But my vote is definitely single. Why not have a kit that will put less stress on the turbo, motor, and drivetrain components compared to a twin. Plus the benefit of a simpler setup when it comes to fixing things

CES if you have the money. That steedspeed manifold is bad ass.

I should be adding PI in the spring full E85. Should start to get fun. Be happy to go for a rip down the highway sometime with you as you are local. I never find any N54s who want to race on my journeys.

[Soden82]

Originally Posted by Torgus

CES if you have the money. That steedspeed manifold is bad ass.

I should be adding PI in the spring full E85. Should start to get fun. Be happy to go for a rip down the highway sometime with you as you are local. I never find any N54s who want to race on my journeys.

I'm absolutely interested Torgus. Can message me whenever and I'd be happy to give you my number. I'm planning for e85 in the spring with bolt ons while I save my pennies for a CES kit (hopefully).

[CarAbuser]

Originally Posted by Saif2018

Getting just over 14mpg (combined) on stock turbos, how much better mpg is ST gonna give lol?

The N54 is just terrible on fuel consumption, regardless of what you do. The best I got was just under 20 mpg (combined city and highway) driving like a granny, then I thought what the heck am I doing driving an N54 like a granny?

You've almost certainly got problems with the car to be getting that sort of mileage.

Neither of my cars get below 25mpg, the Z4 is used mainly as a weekend car and gets about 25mpg, the 335i is used for longer journeys and commuting and will get around 29mpg. Both are tuned to about 20PSI tapering to 16PSI on stock turbos so probably more aggressive than MHD 2+.

[Saif2018]

Originally Posted by CarAbuser

You've almost certainly got problems with the car to be getting that sort of mileage.

Neither of my cars get below 25mpg, the Z4 is used mainly as a weekend car and gets about 25mpg, the 335i is used for longer journeys and commuting and will get around 29mpg. Both are tuned to about 20PSI tapering to 16PSI on stock turbos so probably more aggressive than MHD 2+.

Nah, running fine on boost targets, checked data logs as well.

It's most likely due to my right foot, lol, depends how often you ripping it as well

Also I do a lot of city driving, majority, so I can approx 18-20 mpg under normal driving, which is pretty much what BMW say it should be getting City driving.

long distance and highway I can get those mpg you listed above.

MPG doesn't matter much to me, as long as it keeps giving me SMG (smiles per gallon)