Miata Turbo Forum - Boost cars, acquire cats. - Soviet Era Car, Space Age Turbo. EFR 6758

- Dynos and timesheets (https://www.miataturbo.net/dynos-timesheets-21/)

- - Soviet Era Car, Space Age Turbo. EFR 6758 (https://www.miataturbo.net/dynos-timesheets-21/soviet-era-car-space-age-turbo-efr-6758-a-68914/)

Full-race manifolds are pricy, but definitely amazing work has gone to them. Trust me it is not easy to make a proper twin-scroll. Took me a couple of weekends! Now only if full-race received their shipment of 8374! :)

Quote:

Originally Posted by soviet (Post 939410)

Yeah it's a 99-00 head I picked up from a junkyard. The only thing I did to it was machine the head surface flat.

I have a VVT head in garage and while sure, I may not necessary pick anything up from just having VVT vs 99 head - the purpose with the VVT head is to build/port it for a higher revlimiter and better flow.

I've heard the VVT's are a bit flatter up top - since you're already at parts-risk down low, it would seem there's not a huge advantage. I did a bit of building on my VVT head, but I think until I get new cams, there's little point.

Quote:

Originally Posted by soviet (Post 939514)

EBC holds boost to redline - flat like Keira Knightley. Addressing the torque drop in high rpm was most important to me. Here's the things I've changed:
- obviously bigger compressor wheel with different compressor map
- VICS works and activates at 5000
- magic timing map made by Faeflora, with timing ramping up about 6* from 5.5k to redline
- sacrificed a goat??

My reasoning for using VVT in future is not "VVT is magical" but "if I'm going to spend $$$ on a head, might as well be a VVT head"

You're making me reconsider my plans for a BW 7064
(um BW 179355 (7064 product line)
0.83 A/R T3 undivided (Internal WG)
I was (am?) worried about getting stuck at 350 and hitting a wall, but it does seem that with some bolt ons (manifolds, etc) you'll have no trouble seeing 450. You're certainly not revving things much - I've gone years on a used '00 head and stock internals at 7800 rpm and 18 psi without even an oil change (long story). Now, that's street use, but still, I think you are being way too conservative (at least for street use) on your tune.

Either way, super inspiring, kinda second guessing my turbo choice now - thankfully, I haven't bought it yet.

bump from the grave, I know, I know.

I never saw where it said which A/R turbine housing this was...?

Thanks!

Quote:

Originally Posted by Homemade WRX (Post 1188651)

bump from the grave, I know, I know.

I never saw where it said which A/R turbine housing this was...?

Thanks!

Its a T25 housing which AFAIK only comes in 0.64 a/r

ok, that was my guess based on timeframe. If T25 housing, yes, it's the 0.64 housing.

If I ever made any changes, I would go with a EFR 7163 and 0.80 A/R T4 Twin Scroll housing - along with a new manifold and downpipe.

I'm torn between this turbo and the 7163 myself so I can't blame you soviet. I'm pretty used to the 2560 I've been running and I can't decide on the turbo. The 7163 TS is pretty damn tempting though!

Just had a funny thought reading the title of this thread. The Soviet era sort of was the space age LULZ.

Oh yeah, and Necropost :)

Quote:

Originally Posted by soviet (Post 1188841)

If I ever made any changes, I would go with a EFR 7163 and 0.80 A/R T4 Twin Scroll housing - along with a new manifold and downpipe.

for moar torque?!