Engine Upgrades
#1
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So per this article https://www.miataturbo.net/diy-turbo...k-links-56507/
it appears that the rods and pistons are major items that need to be upgraded to make power north of 250whp.
My question is first does the crank typically need to be upgraded?
Can you achieve 300+ with just rods while using stock piston? Or should you also do pistons as well?
What head work do people typically do?
Thanks
it appears that the rods and pistons are major items that need to be upgraded to make power north of 250whp.
My question is first does the crank typically need to be upgraded?
Can you achieve 300+ with just rods while using stock piston? Or should you also do pistons as well?
What head work do people typically do?
Thanks
#5
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So per this article https://www.miataturbo.net/diy-turbo...k-links-56507/
it appears that the rods and pistons are major items that need to be upgraded to make power north of 250whp.
My question is first does the crank typically need to be upgraded?
Can you achieve 300+ with just rods while using stock piston? Or should you also do pistons as well?
What head work do people typically do?
Thanks
it appears that the rods and pistons are major items that need to be upgraded to make power north of 250whp.
My question is first does the crank typically need to be upgraded?
Can you achieve 300+ with just rods while using stock piston? Or should you also do pistons as well?
What head work do people typically do?
Thanks
#7
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7. The connecting rods. 250 WTQ. Maybe a little less over time. This is the weak link in the Miata engine. Mazda used the same 1.6L rods when building the 1.8L engine, so there is no variance in the power-holding ability between 1.6/1.8. You have two options for improving the rods: (Thanks Jeff Cieleski!!)
-----A. Cheap aftermarket rods: Will ensure that you break EVERYTHING ELSE before ever having to replace a rod again. (Detonation not included)
-----B. Expensive aftermarket rods: Will put power down exactly the same as the cheap rods, but weigh less, mathematically improving power gains
9. Stock Pistons. 300hp. This is not a definitive number, but rather a generally agreed upon value. Stock pistons are forged, but generally fail at the ring lands. Your options for pistons include compression ratio and price.
-----A. Compression Ratio: High compression ratios tend to offer better throttle response, as well as more off-boost power. The drawback is that higher compression ratios require a much more precise tune. More power is being made on lower compression pistons because of their natural resistance to knock relative to the higher compression pistons. Current members are running radical ignition timing on low compression pistons…with a safety margin...
-----B. Price differences: See item 7. (Connecting Rods) Above.
#9
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No miata will make 300hp. There is no proven formula to even get close. Like why bother going to trackspeed. The conversation will go like this
You: "Hey man i want decent power can i buy a turbo kit"
Trackspeed: "Easy here is my track proven turbo kit you should be fine with a 6258. What supporting mods will you be doing?"
you: "Huh"
Trackspeed: "Not to worry haha. We will set you up with injectors, rods, pistons, acl race bearings and a good intercooler and you will be all set for lots of track days at your power goal"
you: "WOW! you have this all figured out to a science dont you?"
Trackspeed: "Pretty common practice now and we did a lot of R&D to prove this setup. We believe it to be one of the best kits on the market. Go check out our website sometime for even more good parts."
Holly cow a link
You: "Hey man i want decent power can i buy a turbo kit"
Trackspeed: "Easy here is my track proven turbo kit you should be fine with a 6258. What supporting mods will you be doing?"
you: "Huh"
Trackspeed: "Not to worry haha. We will set you up with injectors, rods, pistons, acl race bearings and a good intercooler and you will be all set for lots of track days at your power goal"
you: "WOW! you have this all figured out to a science dont you?"
Trackspeed: "Pretty common practice now and we did a lot of R&D to prove this setup. We believe it to be one of the best kits on the market. Go check out our website sometime for even more good parts."
Holly cow a link
#18
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Join Date: Mar 2014
Location: Jacksonville, FL
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300hp? Easy, get $6000 ready.
need:
turbo: efr6258, gt2860 or gt2871
injectors: flow force 640cc or id1000/1050x
ms3 ecu
good clutch, I recommend FM level1
upgraded fuel pump
intercooler/piping/Bob
engine:
Stronger rods Ebay or brand name, all seems to work fine.
while engine is open, new rings, oem seals, bearings and hone.
if starting with nb1 or nb2 block, get pistons out of NA miata. Stock lower compression, and cheap.
dont touch head, crank, etc... that's all just fine to over 400hp.
if 400+ hp is needed in future, get forged pistons.
this is exactly what I'm running. 309hp.
need:
turbo: efr6258, gt2860 or gt2871
injectors: flow force 640cc or id1000/1050x
ms3 ecu
good clutch, I recommend FM level1
upgraded fuel pump
intercooler/piping/Bob
engine:
Stronger rods Ebay or brand name, all seems to work fine.
while engine is open, new rings, oem seals, bearings and hone.
if starting with nb1 or nb2 block, get pistons out of NA miata. Stock lower compression, and cheap.
dont touch head, crank, etc... that's all just fine to over 400hp.
if 400+ hp is needed in future, get forged pistons.
this is exactly what I'm running. 309hp.