Log or ramhorn manifold for EFR6258
#21
lol no worries
I ran a GT2554 at 14 psi on an HKS log. It hit real hard but did struggle at the top end like a MP62 ;-)
I've been thinking there's so many factors going on.
Manifold volume
Pipe diameter
Number and bend radius of gas direction changes
Package space
Downpipe location, number of bends etc
Cost
Power goal
Its between an equal length ram horn or flow directed collected very short unequal length tubular
I have some 1.25" schedule 10 stainless 304L cast elbows that I'm going with. Quality is good and a machined manifold to head flange from these dudes: Exhaust Head Flange - Mazda - Mazda Miata 1.8 Exhaust Head Flange
I ran a GT2554 at 14 psi on an HKS log. It hit real hard but did struggle at the top end like a MP62 ;-)
I've been thinking there's so many factors going on.
Manifold volume
Pipe diameter
Number and bend radius of gas direction changes
Package space
Downpipe location, number of bends etc
Cost
Power goal
Its between an equal length ram horn or flow directed collected very short unequal length tubular
I have some 1.25" schedule 10 stainless 304L cast elbows that I'm going with. Quality is good and a machined manifold to head flange from these dudes: Exhaust Head Flange - Mazda - Mazda Miata 1.8 Exhaust Head Flange
Last edited by Lloyd_D; 06-19-2014 at 06:47 PM.
#23
I have an Artech ramhorm manifold with my EFR 6258. I made 315WHP @ 12PSI and 323WHP @ 14PSI on a Mustang dyno in El Paso, TX (approx 4000' elevation). I also have a 3" exhaust and 2.75" intercooler pipes with a Precision 600 intercooler. This a a mild steel manifold, not SS.
315WHP and 251TQ at around 12PSI (179kPa)
323WHP / 262WTQ @ 14 PSI
There was a problem with my manual boost controller in the second dyno. I could have made more power. I'm now running EBC.
Moar pics of manifold
315WHP and 251TQ at around 12PSI (179kPa)
323WHP / 262WTQ @ 14 PSI
There was a problem with my manual boost controller in the second dyno. I could have made more power. I'm now running EBC.
Moar pics of manifold
#25
Wo
That is some manifold. Nice welding on that.
Its almost like with the EFR6258 your forced to go top mount to keep the PS..
I'm hoping to retain it with a tight to head canted orientation similar to Soviet's
The problem is the BW turbo's are a mile long and to clear the body your forced to do unpleasant things
That is some manifold. Nice welding on that.
Its almost like with the EFR6258 your forced to go top mount to keep the PS..
I'm hoping to retain it with a tight to head canted orientation similar to Soviet's
The problem is the BW turbo's are a mile long and to clear the body your forced to do unpleasant things
#28
I got in touch with ARTech and ordered the same manifold & downpipe as Swimming108: https://www.miataturbo.net/build-thr...llo-efr-77075/. It looks very, very similar to what Mazdaspeeder is running.
These are Swimming108's pics, not mine:
According to Abe, nothing needs modification to fit this manifold. Its both PS and AC compatible, and should require no modification to the mixing manifold.
Interesting enough, I need to get in touch with Abe as I can't remember if I ordered mine in 1.25 or 1.5. Swimming's looks like 1.5?
Anyway, I honestly don't think it'll make that much difference with my 6258. I'm not shooting for SovietPower™ on the top end. Dem throttle response y0, et cetera...
These are Swimming108's pics, not mine:
According to Abe, nothing needs modification to fit this manifold. Its both PS and AC compatible, and should require no modification to the mixing manifold.
Interesting enough, I need to get in touch with Abe as I can't remember if I ordered mine in 1.25 or 1.5. Swimming's looks like 1.5?
Anyway, I honestly don't think it'll make that much difference with my 6258. I'm not shooting for SovietPower™ on the top end. Dem throttle response y0, et cetera...
#29
My manifold IIRC was built by Abe on the specs of 99MX5's manifold. Except I retained PS, pretty sure he did not.
I believe it is sch40 mild steel runners with both flanges being SS, with 1.25" runners.
pre-coat
post-coat
If you want more photos let me know. Here is a link for the coating: http://swaintech.com/race-coatings/r...aust-coatings/
Also just as a personal opinon, with the kind of power the EFR turbos make, you'll be hard pressed to notice a difference between a log or ramhorn maniflold, for most people anyway.
I believe it is sch40 mild steel runners with both flanges being SS, with 1.25" runners.
pre-coat
post-coat
If you want more photos let me know. Here is a link for the coating: http://swaintech.com/race-coatings/r...aust-coatings/
Also just as a personal opinon, with the kind of power the EFR turbos make, you'll be hard pressed to notice a difference between a log or ramhorn maniflold, for most people anyway.
Last edited by Mazdaspeeder; 06-20-2014 at 09:25 AM.
#30
I think you would notice.
I have used both types that I built. The results in this writeup feel accurate from what I had to do to the fuel map in my car.
http://www.full-race.com/articles/Bs...st_writeup.pdf
I have used both types that I built. The results in this writeup feel accurate from what I had to do to the fuel map in my car.
http://www.full-race.com/articles/Bs...st_writeup.pdf
#35
Ok I made something... its a short unequal ramhorn
Volume is about 550cc. Wanted this as small as possible to keep spool good but not limit flow. Angle changes are kept to a minimum. Cylinders 2 & 3 have very little angle change. Cylinders 1 & 4 are as large radius as possible.
http://postimg.org/image/4b4qfhli5/
http://postimg.org/image/7xajs4rvh/
http://postimg.org/image/7cvipfyn1/
http://postimg.org/image/tarzj8dnh/
Stainless MIG welded, she isn't pretty I know
Volume is about 550cc. Wanted this as small as possible to keep spool good but not limit flow. Angle changes are kept to a minimum. Cylinders 2 & 3 have very little angle change. Cylinders 1 & 4 are as large radius as possible.
http://postimg.org/image/4b4qfhli5/
http://postimg.org/image/7xajs4rvh/
http://postimg.org/image/7cvipfyn1/
http://postimg.org/image/tarzj8dnh/
Stainless MIG welded, she isn't pretty I know
#39
Its RHD...
Compressor housing is about 40mm off the sub frame. I had to move alot of stuff. PS pipes (reservoir and pump feed), and get the water pump outlet modified. The frame rail lip was also cut back and re-welded.
http://postimg.org/image/m1b0e9ogt/
View image: P1010633
http://postimg.org/image/4pf96kkd9/
http://postimage.org/image/qd47h0krh/
View image: image
http://postimg.org/image/7nc809s0t/
Its been cleaned and smoothed internally as best I can with a long reach die grinder
Compressor housing is about 40mm off the sub frame. I had to move alot of stuff. PS pipes (reservoir and pump feed), and get the water pump outlet modified. The frame rail lip was also cut back and re-welded.
http://postimg.org/image/m1b0e9ogt/
View image: P1010633
http://postimg.org/image/4pf96kkd9/
http://postimage.org/image/qd47h0krh/
View image: image
http://postimg.org/image/7nc809s0t/
Its been cleaned and smoothed internally as best I can with a long reach die grinder