NEW EFR?
#61
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On that car, to me the powerband is perfect, and it felt fantastic. I likely wouldn't move anything around at all. It's great for street, track, you name it.
However, if I didn't have a built engine, and wasn't planning to make over 300, I'd probably get me the even smaller EFR and enjoy even more lowend thrust and snappier response (if that's even possible, lol, the 6258 already shines at both those things.....we shall see of course).
However, if I didn't have a built engine, and wasn't planning to make over 300, I'd probably get me the even smaller EFR and enjoy even more lowend thrust and snappier response (if that's even possible, lol, the 6258 already shines at both those things.....we shall see of course).
Seems like the perfect combination. Definitely a lot on the street.
I could see wanting a smaller turbo if you put lots of miles on it!
Is your car really 2550 pounds as the dyno sheet says?
#63
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Ah! That makes sense. Will look up his build!
What are people doing for boost control on the internal gate EFR...I read about lots of difficulties there?
I was looking at the 2 port Turbo Smart, but I saw this
Evasive Motorsports PH: 626.336.3400 Mon-Fri, 9am-6pm PST: BorgWarner EFR Dual Port Internal-WG actuator
Any thoughts?
Jamie
What are people doing for boost control on the internal gate EFR...I read about lots of difficulties there?
I was looking at the 2 port Turbo Smart, but I saw this
Evasive Motorsports PH: 626.336.3400 Mon-Fri, 9am-6pm PST: BorgWarner EFR Dual Port Internal-WG actuator
Any thoughts?
Jamie
#64

The EFR5951 looks promising for the future, I'd expect TSE kits to sell like hawt cakes when packaged together. I'm very interested... VERY very interested to see what this new baby trubo can do. Gives me all the more reason to ditch this 2860 setup 


Last edited by Girz0r; 02-20-2017 at 10:33 AM.
#65
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#66
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Ah! That makes sense. Will look up his build!
What are people doing for boost control on the internal gate EFR...I read about lots of difficulties there?
I was looking at the 2 port Turbo Smart, but I saw this
Evasive Motorsports PH: 626.336.3400 Mon-Fri, 9am-6pm PST: BorgWarner EFR Dual Port Internal-WG actuator
Any thoughts?
Jamie
What are people doing for boost control on the internal gate EFR...I read about lots of difficulties there?
I was looking at the 2 port Turbo Smart, but I saw this
Evasive Motorsports PH: 626.336.3400 Mon-Fri, 9am-6pm PST: BorgWarner EFR Dual Port Internal-WG actuator
Any thoughts?
Jamie
What difficulties? Mines been running fine for a couple years.
#67
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Um, no. I'll touch more on that in a second.
Yep, that's my car!

Link is in my sig. You've been warned.

Ok, I feel I need to address something real quick that I'm pretty sure no one has mentioned yet. Jamie, I don't know you or your son, and as such I say this with all the respect in the world, but I think you are overlooking something serious here: all hyperbole aside, a 300+HP Miata is a god damn death machine in the wrong hands. Have you driven a 300HP Miata? How about 250HP? Or even 200HP? I would strongly encourage you to do so before you get too far into this. This is not a Corvette, or a new Mustang, or a Camero, It is a radically different experience. I come from a long line of overpowered rear wheel drive V8 cars so I have had more than a decade of driving experience with tail happy beasts and my car is seriously intimidating. I've got enough fuel that I could safely run ALLOFIT on CA **** 91 with the EFR 6258 but I have to tell you, I have no desire to find out what the limits of the fuel system are, because I've reached the limits of my skill. On street tires, traction is merely the fever dream of a madman in 1st and 2nd if you are not paying attention, and at any time I can put my foot in the throttle in 3rd and 4th and the tires sublimate directly from solid to vapor state before I can even think about it. While that sounds like fun, its seriously dangerous as ****. Driving my car in anger has a tendency to convert that rage directly into a healthy respect or even fear. Like I said, I don't know you or your son, and I don't know his skill level or driving history, but I would not, under any circumstances put say, a 20 year old kid behind the wheel of my car. I would not expect them or the car to last long.
#68
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Take a Corvette C6 Z06, put it on a 245mm wide tire, and take 16" out of the wheelbase. That's what you are building when you put a 300whp Miata together.
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#70
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^^ Truth.
Someone with more smarts than me should take the coefficient of friction for an NB with a hard top, and calculate the maximum speed attainable with 300hp, 6 speed and 3.63
Maybe I can go do the Texas Mile, or visit Bonneville. Hah!
2017 World of Speed is in September this year, I can maybe have the car working by then.
Someone with more smarts than me should take the coefficient of friction for an NB with a hard top, and calculate the maximum speed attainable with 300hp, 6 speed and 3.63

2017 World of Speed is in September this year, I can maybe have the car working by then.
#71
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^^ Truth.
Someone with more smarts than me should take the coefficient of friction for an NB with a hard top, and calculate the maximum speed attainable with 300hp, 6 speed and 3.63
Maybe I can go do the Texas Mile, or visit Bonneville. Hah!
2017 World of Speed is in September this year, I can maybe have the car working by then.
Someone with more smarts than me should take the coefficient of friction for an NB with a hard top, and calculate the maximum speed attainable with 300hp, 6 speed and 3.63

2017 World of Speed is in September this year, I can maybe have the car working by then.

CD is 0.36 with soft top, so guessed 0.35.
#75
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Oddly enough, tire deflection ends up making the tire shorter, at least in the 140-150mph neighborhood. Maybe 180+ would change that, but the data I have says you need about 6% more RPM than you think you do to reach a gear-calculated speed.
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#76

The EFR internal gate gave me fits too. My problem ended up being a combo of needing to clock the CHARA a little and also needing to bend the wastegate mount in order to get it to move freely through the whole range. I didnt feel like having to fight with it again to nudge and tickle it to be just so for my next setup and the EWG only IRL 7163s came about at just the right time so I went that way. I'm sure TSE checks each one for alignment before it goes out the door on their kits.
#77
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Actually, that makes sense thinking about it. The amount of torque being applied just to over come the drag probably rotates the rim ahead of the outside edge of the tire. Something like a wrinckle wall drag tire.
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I don't, yet. I was thinking about it last week after the chat in Aidan's thread. I would have to add something to the cost of each kit due to the time it would take, but I'll probably start doing it.
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#79
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