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280whp+ Borg Warner turbo set up
I’m looking to build my 04 Mazdaspeed Miata to its true form. I want run a Borg Warner 6258 .80 Twin Scroll and 9.5:1 on pump gas 91-93 is the best octane I’m able to get as of my current location. I want to know if this is remotely possible or is this me chasing a dream?
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It will work fine but you are going to be knock limited around 280-290 whp.
Dann |
Im running a standard T25 6258, and make about 300whp at 17-18 psi. on 93 pump gas.
rods only motor build with pistons out of a 94 miata. these supposedly have lower compression 8.8:1 or so. 280-300hp should be doable for you with proper dyno tuning. |
What would possibly help reduce knock? Stronger coils? Lower C.R.? |
Originally Posted by 04MiataNoobster
(Post 1498748)
What would possibly help reduce knock? Stronger coils? Lower C.R.? |
@borka i want to run the stock compression ratio which is 9.5:1 and I like it for the fact it has a bit more acceleration before the turbo kicks up |
I, too, choose to sacrifice performance from 2200rpm-7500rpm in order for a small bit of extra pickup between 1200rpm and 1800rpm
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@borka i want to still stay at 83mm bore. I know staying at 83mm with 9.5:1 CR is going to require custom pistons and I wouldn’t mind the extra money spent |
Originally Posted by 04MiataNoobster
(Post 1498750)
@borka i want to run the stock compression ratio which is 9.5:1 and I like it for the fact it has a bit more acceleration before the turbo kicks up another way to reduce knock is methanol/water injection. i've never done it, so dont have much info about this. im pretty sure you should be able to hit around 300hp with 9.5:1 pistons. on pump gas. |
@savington well what would you choose as a C.R.? |
Originally Posted by 04MiataNoobster
(Post 1498755)
@savington well what would you choose as a C.R.? |
@borka Im not trying to run insane boost e10-15psi if possible is nice in my opinion. Would lowering the C.R. to 9:1 be any different in possible reducing knock? |
Originally Posted by Savington
(Post 1498756)
8.6:1. I also build engines and sell the best Borg Warner turbo systems on the market for these cars, FYI, so I have a bit of experience doing exactly what you want to do.
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Originally Posted by 04MiataNoobster
(Post 1498759)
@borka Im not trying to run insane boost e10-15psi if possible is nice in my opinion. Would lowering the C.R. to 9:1 be any different in possible reducing knock? you can do that on stock pistons. Just install stronger rods. or get forged pistons if money is no issue. With 8.6:1 CR. 9.5:1 pistons is for e85 |
Originally Posted by 04MiataNoobster
(Post 1498760)
From 8.6:1 to 9:1 would the difference in spool be a notice able difference at same psi or non at all? |
Originally Posted by nitrodann
(Post 1498741)
It will work fine but you are going to be knock limited around 280-290 whp.
Dann |
Originally Posted by borka
(Post 1498761)
10-15psi will get you 220-280ish whp.
you can do that on stock pistons. Just install stronger rods. or get forged pistons if money is no issue. With 8.6:1 CR. 9.5:1 pistons is for e85 |
Originally Posted by Savington
(Post 1498762)
You will never notice, and you would be hard-pressed to measure the difference.
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Originally Posted by 04MiataNoobster
(Post 1498766)
fair enough and which forged piston brand would you recommend for this build? |
Originally Posted by 04MiataNoobster
(Post 1498766)
fair enough and which forged piston brand would you recommend for this build? |
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