EVO VIII twin scroll turbo...let's discuss!
#1
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EVO VIII twin scroll turbo...let's discuss!
greetings all,
i just completed my 1.6l diy turbo build. all is well, the car is a blast to drive. Thanks to the many board members who helped answer my various questions. I still consider myself a "green" mechanic, so I appreciate the helpful tips from everyone.
At any rate, I am going to start gather new parts to turbo a BP. I am considering turbo options, and I'm quite interested in the evo 8 unit. I like the fact that its a twin scroll unit, and I have a friend who does the most most amazing fabrication work ( works for ams), so a manifold is no problem.
my questions are:
1) how good of a match is the evo unit for the 1.8L.?. I am still having a hard time reading compressor maps, so an expert may be in order to answer this. I'd like to hear opinions on what spool might be like, also.
2) since im a college kid, I am doing the build on the cheap. should I have any problems running something like 8psi on the evo unit (using fuel bandaids) or should I go for a more conventional small turbo approach ( thinking 14b)
thanks,
-dan
i just completed my 1.6l diy turbo build. all is well, the car is a blast to drive. Thanks to the many board members who helped answer my various questions. I still consider myself a "green" mechanic, so I appreciate the helpful tips from everyone.
At any rate, I am going to start gather new parts to turbo a BP. I am considering turbo options, and I'm quite interested in the evo 8 unit. I like the fact that its a twin scroll unit, and I have a friend who does the most most amazing fabrication work ( works for ams), so a manifold is no problem.
my questions are:
1) how good of a match is the evo unit for the 1.8L.?. I am still having a hard time reading compressor maps, so an expert may be in order to answer this. I'd like to hear opinions on what spool might be like, also.
2) since im a college kid, I am doing the build on the cheap. should I have any problems running something like 8psi on the evo unit (using fuel bandaids) or should I go for a more conventional small turbo approach ( thinking 14b)
thanks,
-dan
#3
AMS is a serious shop out of Chicago. They are mostly a Evo shop but also have one of the worlds fastest ka-t 240sx's. They make great stuff.
I'm surprised you haven't heard of them, they have some of the fastest time attack cars in the US.
http://www.amsperformance.com/main.php
I'm surprised you haven't heard of them, they have some of the fastest time attack cars in the US.
http://www.amsperformance.com/main.php
#4
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never heard of ams!! for god's sake man, youre from chicago too!
http://www.amsperformance.com/ ....watch the vids and you'll freak.
in other breaking news, the germans surrendered, and europe is going to have to be rebuilt. jk
http://www.amsperformance.com/ ....watch the vids and you'll freak.
in other breaking news, the germans surrendered, and europe is going to have to be rebuilt. jk
#8
never heard of ams!! for god's sake man, youre from chicago too!
http://www.amsperformance.com/ ....watch the vids and you'll freak.
in other breaking news, the germans surrendered, and europe is going to have to be rebuilt. jk
http://www.amsperformance.com/ ....watch the vids and you'll freak.
in other breaking news, the germans surrendered, and europe is going to have to be rebuilt. jk
And awesome that chicago is starting to get some cool turbo guys.
#11
Heh, I was over at AMS for their new shop grand opening bbq. The new shop space is so damn nice.
The 16g is a pretty nice oem turbo, with a properly designed split manifold to take full advantage of the twinscroll it will definitly spool faster than a similar big 16g.
Dirty, update your location profile
The 16g is a pretty nice oem turbo, with a properly designed split manifold to take full advantage of the twinscroll it will definitly spool faster than a similar big 16g.
Dirty, update your location profile
#12
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dont know much about the particular turbo but twin scrolls have been around for decades (factory on the early 90s turbo 4wd celicas). chances are you wont see/notice a difference over the same turbo with a single entry housing. perhaps if you designed the manifold like the factory did (however that is) you could realize the couple hundred RPM spool improvement but that would be it.
I Guess they keep the pulses from opposite ports away from each other to avoid the whole FM/BEGi "directed pulse" argument.
I Guess they keep the pulses from opposite ports away from each other to avoid the whole FM/BEGi "directed pulse" argument.
#14
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dont know much about the particular turbo but twin scrolls have been around for decades (factory on the early 90s turbo 4wd celicas). chances are you wont see/notice a difference over the same turbo with a single entry housing. perhaps if you designed the manifold like the factory did (however that is) you could realize the couple hundred RPM spool improvement but that would be it.
I Guess they keep the pulses from opposite ports away from each other to avoid the whole FM/BEGi "directed pulse" argument.
I Guess they keep the pulses from opposite ports away from each other to avoid the whole FM/BEGi "directed pulse" argument.
granted, this test was on a Subaru Legacy , but Im sure the same theory would hold true on a miata.
also, does anybody know if the all trac turbo is a version of the ct 26?
-dan
#17
Well, consider this.. on the miata, with a log manifold, you've got about a foot of pipe from the exhaust port to the turbo. On a subaru, from #1 to the turbo (in stock location), it's like 6 feet, maybe more...
The exhaust ports are down by the lower control arms, the turbo is up by the passenger side firewall.
The exhaust ports are down by the lower control arms, the turbo is up by the passenger side firewall.
#18
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sorry OP but we're threadjacking a little bit
i used to own a bugeye wag fwiw
i understand what your saying, but i think your comparing apples to oranges. The size of equal length vs. unequal length headers in subaru's are almost the same. Plus, tons of dudes make 500 plus hp on stock headers ( im talking about usdm ej25s)...the real benefit of the eq length headers is the spool.
like i said, im a green mechanic so there is probably a flaw in my arguemnt. experts chime ..now
-dan
ps your avatar is hilarious
Well, consider this.. on the miata, with a log manifold, you've got about a foot of pipe from the exhaust port to the turbo. On a subaru, from #1 to the turbo (in stock location), it's like 6 feet, maybe more...
The exhaust ports are down by the lower control arms, the turbo is up by the passenger side firewall.
The exhaust ports are down by the lower control arms, the turbo is up by the passenger side firewall.
i understand what your saying, but i think your comparing apples to oranges. The size of equal length vs. unequal length headers in subaru's are almost the same. Plus, tons of dudes make 500 plus hp on stock headers ( im talking about usdm ej25s)...the real benefit of the eq length headers is the spool.
like i said, im a green mechanic so there is probably a flaw in my arguemnt. experts chime ..now
-dan
ps your avatar is hilarious
#19
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i read a post by quirt crawford, of crawford performance, regarding the spool characteristics of equal length and non equal length manifolds. On the non twin scroll manifold, the powerband came on 750 rpm later than the twin scroll mani.
granted, this test was on a Subaru Legacy , but Im sure the same theory would hold true on a miata.
also, does anybody know if the all trac turbo is a version of the ct 26?
-dan
granted, this test was on a Subaru Legacy , but Im sure the same theory would hold true on a miata.
also, does anybody know if the all trac turbo is a version of the ct 26?
-dan
I have a cracked ct26 turbine housing in my garage. nice paperweight.