sean's cheap thrills, 90 1.6 with subaru td04 - Page 48 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-10-2015, 10:33 PM   #941
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<p>Which is why my motor build isn't happening right now. I want to do it right.</p>
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Old 09-10-2015, 10:37 PM   #942
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Don't get npr pistons
Don't do it
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Old 09-10-2015, 10:37 PM   #943
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Forged pistons won't stand to det much better than OEM, especially if you are pushing harder. They suck for a daily driver, as they have to fit looser and will knock on starts and stuff.

If you aren't at OEM piston melting levels, you don't need forged pistons IMO. Piston melting level is way past drivetrain explodey levels, so why bother?
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Old 09-10-2015, 10:38 PM   #944
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Was just searching google for something, and noticed someone said the 4w came in the mazda speeds?

The guy handed me a bracket with a solenoid and a black box with "boost control" or something to that effect written on it, all eom, not aftermarket stuff. I told him it couldnt belong to this motor as only 04-05 got boost, he said it came with it so...

Do I have a mazdaspeed motor?
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Old 09-10-2015, 10:41 PM   #945
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mazdaspeed miata engine

post #5.

*runs to garage to go check*

no the VC isnt red
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Old 09-10-2015, 10:42 PM   #946
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You do not.
All NB's have a "boost" solenoid. It doesn't actually control boost, obviously. I think you're talking about the baro/evap/purge sensor/solenoid setup.
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Old 09-10-2015, 10:44 PM   #947
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Quote:
Originally Posted by deezums View Post
Forged pistons won't stand to det much better than OEM, especially if you are pushing harder. They suck for a daily driver, as they have to fit looser and will knock on starts and stuff.

If you aren't at OEM piston melting levels, you don't need forged pistons IMO. Piston melting level is way past drivetrain explodey levels, so why bother?
this is not correct.
they CAN take det much more than OEM, and still stay intact. a "det cushion" of sorts for when you run that extra degree of timing or do something mildly stupid when tuning, or run it really hard at the track
the myth is that they are pretty much det-proof, which is false.
Also it all depends on how you build. There's built engines with forged pistons running 60-90k no problem, and there's ones that are so loose they eat the bores within 10k.

There's a lot to this. Sean (IMHO) is just starting to mess with it and I think he's finally realizing there might be more to it than building an engine "in an afternoon"

Not trying to be mean, but that's the truth.
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Old 09-10-2015, 10:45 PM   #948
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Quote:
Originally Posted by 18psi View Post
You do not.
All NB's have a "boost" solenoid. It doesn't actually control boost, obviously. I think you're talking about the baro/evap/purge sensor/solenoid setup.
ok, that makes sense i guess, they just reused a part they had 10 million of.

not seeing wisecos for 99+ either, or do i have the dumbs? Im getting a little ahead here, but what are the mt.net sanctioned piston choices?
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Old 09-10-2015, 10:49 PM   #949
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all 1.8 94-05 pistons will fit
with pump gas and track time, you should be looking at 8.6cr
there's a ton of choices, and there's a ton of opinions
supertech seems to be popular, but again, there's a ton of choices
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Old 09-10-2015, 10:53 PM   #950
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Don't supertechs crack unless you hand modify them?

I never plan to use forged pistons, so I don't read into them much. Seems way more trouble than it's worth to me.

Concerns about Supertech pistons
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Old 09-10-2015, 10:53 PM   #951
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Quote:
Originally Posted by 18psi View Post
this is not correct.
they CAN take det much more than OEM, and still stay intact. a "det cushion" of sorts for when you run that extra degree of timing or do something mildly stupid when tuning, or run it really hard at the track
the myth is that they are pretty much det-proof, which is false.
Also it all depends on how you build. There's built engines with forged pistons running 60-90k no problem, and there's ones that are so loose they eat the bores within 10k.
agree

just trying to live up to my thread tittle and be a tight ***

Quote:
Originally Posted by 18psi View Post
There's a lot to this. Sean (IMHO) is just starting to mess with it and I think he's finally realizing there might be more to it than building an engine "in an afternoon"

Not trying to be mean, but that's the truth.

It was just a goal ive done 4 cylinder rebuilds in an afternoon, but those were for customers who werent going to pay for super ---- cleaning and painting, and didnt have to run 10 different places because of lack of preparedness and unforeseen events. But yea, this one is going to definitely get more attention, and Im going to take my time because I can now.
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Old 09-10-2015, 10:55 PM   #952
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Quote:
Originally Posted by deezums View Post
Don't supertechs crack unless you hand modify them?

I never plan to use forged pistons, so I don't read into them much. Seems way more trouble than it's worth to me.

Concerns about Supertech pistons
I cant say ive ever had forged pistons in any of my cars, but all the bikes have them. Once warm, theyre fine, and remember my car is a street legal track toy, not a daily.
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Old 09-10-2015, 10:58 PM   #953
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<p>8.6cr is for sissys. Why the **** does supertech not make a 10:1. Sad face.</p><p>OEM pistons will die with a little bit of det. Forged will withstand tuning mistakes.</p>
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Old 09-10-2015, 10:59 PM   #954
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Quote:
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<p>8.6cr is for sissys. Why the **** does supertech not make a 10:1. Sad face.</p>
Then call me a bitch.

The minor lack of off boost HP so does not out weigh the risk of having 0 HP.
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Old 09-10-2015, 11:00 PM   #955
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<p>Tune it right and it will be fine. Days of 8.6 are numbered, piggybacks are gone and we have good tuning **** now.</p>
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Old 09-10-2015, 11:05 PM   #956
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Do you know what kind of gas CA/AZ/NM gets? (and/or navada?)

Lets just say cobb makes a special tune just for us.
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Old 09-10-2015, 11:05 PM   #957
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Quote:
Originally Posted by aidandj View Post
<p>Tune it right and it will be fine. Days of 8.6 are numbered, piggybacks are gone and we have good tuning **** now.</p>
on pump gas? yeah ok
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Old 09-10-2015, 11:06 PM   #958
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<p>
Quote:
Originally Posted by chokeasphyxia View Post
If you do end up wanting wiseco's, they supposedly have to be custom ordered for 1999+ head's because of the valve angle.
</p><p>Maybe not california ****. But i've been reading about compression ratios a lot lately and just what I've been seeing as the trend.</p>
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Old 09-10-2015, 11:08 PM   #959
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Quote:
Originally Posted by aidandj View Post
chokesomething



maybe an oem who has countless r&d $$$, etc. not this dumbass with a craftsman socket set and a lathe.
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Old 09-10-2015, 11:09 PM   #960
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<p>Do you guys have e85?</p><p>10:1 won't be at its best on pump, but should be livable.</p><p>Are you building this motor soon?</p>
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