First time turboing! $4500 with a 250whp goal.....Achievable? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 01-13-2012, 03:48 PM   #21
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I wonder what Savington has to say about a .060" overbore...
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Old 01-13-2012, 03:52 PM   #22
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Never really considered tuning it myself. The guy sponsered by ky clutch does all his own tuning, he said he would be more than glad to help me with anything like that. I think that would help me save alot of money.

I would be willing to sacrifice a few dozen horses to have a reliable "done right" car for my budget. I am going to begin removing my engine asap and take it to the machine shop to get checked out. and if the walls and pistons are fine, I will do stock bore forged pistons and rods and purchase the FM turbo kit with no electronics and still have around $1000 for tuning and a clutch.
The common consensus here is that stock pistons are good to ~300rwhp. Forged pistons are (likely) unnecessary for your stated goal, unless my memory is playing tricks on me.
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Old 01-13-2012, 03:57 PM   #23
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The common consensus here is that stock pistons are good to ~300rwhp. Forged pistons are (likely) unnecessary for your stated goal, unless my memory is playing tricks on me.
Stock pistons wouldnt throw some reliability out the window??
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Old 01-13-2012, 04:03 PM   #24
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Stock pistons wouldnt throw some reliability out the window??
I can't find the thread, but some respected people here were actually claiming the inverse IIRC - i.e., forged pistons are actually inferior to cast pistons for longevity and reliability. I'd recommend you search on it.
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Old 01-13-2012, 04:07 PM   #25
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Maybe you can cut a deal. He helps you with the tuning and you guys both learn MS? Win-win.
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Old 01-13-2012, 04:13 PM   #26
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I found some stuff on a k20 honda forum saying what you just stated, looks like its cast pistons for me. What do I owe you guys for saving me all this money and time? hah.

But yep, sounds like a good deal to me.
Just shot a text to my local machine shop owner asking about a price on checking my head and block to see what the compression problem in cylinder four is. Once he replies its of to the races!
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Old 01-13-2012, 04:30 PM   #27
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MSI for ECU...sigh.
Who said that?
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Old 01-13-2012, 04:43 PM   #28
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See i was thinking the same thing, but I knew miatas didnt put up very good numbers compared to hondas etc. So i figured it would take a little more than that to reach the 250hp mark.

But you dont think the electrode scarred up the walls?
Not all miatas fall short of the 300whp mark on stock motors. 90% of the users on this forum put their miatas together for road racing or auto x or something of that nature where spool is paramount. If you run a bigger turbo with a larger A/R and a good flowing tubular manifold i would venture to say you could prolly keep a stock short block alive at 350whp for a good while. I speculate that with e85 and a good set of cams in a 99 head you might could crack 400whp with a stock shortblock, but at that point rods are only 300$ and stock pistons would hold up fine with e85.

Theres no way the electrode could score the cylinder wall so deep that 20 over wouldn't clean it up, and if its that bad just get another stock motor.
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Old 01-13-2012, 04:47 PM   #29
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Who said that?
MSPNP.



If I was craking open the motor to build it, as it seems you are planning to, I wouldn't skip the rods/forged pistons.
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Old 01-13-2012, 05:24 PM   #30
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6-speed for 250rwhp, MSI for ECU...sigh.

My minions are failing me today...

I'm so embarassed.
How many transmissions total have been in your car? I know of at least 2.

If he going to build a bottom end, there is no reason not to spend a little bit more and get a transmission that will probably last him as long as the motor.
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Old 01-13-2012, 05:42 PM   #31
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Well guys, i may do some little stuff to the head, but if i dont need to touch the block im not going to. my car will be a daily (except during the winter). So is I am going to get the FM turbo kit without electronics, some 550ish injectors, megasquirt, stage 2 ky clutch, and like a said maybe a little head work.
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Old 01-13-2012, 05:44 PM   #32
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Originally Posted by Braineack View Post
MSPNP
I was referring to the fuel and spark tables that are published on the MSPNP website as being a safe starting point for self tuning. I wasn't recommending the MSPNP. That said, I'm pretty happy with mine.

I am, however, delighted by my apparent promotion to "minion."

Back on point . . . .
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Old 01-13-2012, 06:13 PM   #33
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Originally Posted by PBGuts View Post
Well guys, i may do some little stuff to the head, but if i dont need to touch the block im not going to. my car will be a daily (except during the winter). So is I am going to get the FM turbo kit without electronics, some 550ish injectors, megasquirt, stage 2 ky clutch, and like a said maybe a little head work.
I think this is a good idea. It should be just about perfect for you.
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Old 01-14-2012, 01:13 AM   #34
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Looks like I will be doing pistons after all. I took the head off and this is what I got. The walls are in suprisingly good shape though!
Attached Thumbnails
First time turboing! 00 with a 250whp goal.....Achievable?-busted-piston.jpg  
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Old 01-14-2012, 02:21 AM   #35
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Fix engine, buy megasquirt, buy my setup for sale and totally win.
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Old 01-14-2012, 07:30 AM   #36
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Originally Posted by PBGuts View Post
Looks like I will be doing pistons after all. I took the head off and this is what I got. The walls are in suprisingly good shape though!
JB weld it and move on.
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Old 01-14-2012, 11:48 AM   #37
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now you know how much clearance you have above top of piston
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Old 01-14-2012, 01:27 PM   #38
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Looks like you had some bad detonation, i dont think the electrode did that. The same detonation that broke your piston ate your electrode off. I would still just go buy a stock 1.8 shortblock or even longblock. If you live in the Tampa area i know a guy selling a 99 motor with everything on it for stupid cheap, he wont ship it though.
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Old 01-19-2012, 12:27 AM   #39
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Originally Posted by PBGuts View Post
Looks like I will be doing pistons after all. I took the head off and this is what I got. The walls are in suprisingly good shape though!
You got 90 psi of compression out of that?
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Old 01-24-2012, 05:27 PM   #40
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Originally Posted by 1slowna View Post
Looks like you had some bad detonation, i dont think the electrode did that. The same detonation that broke your piston ate your electrode off. I would still just go buy a stock 1.8 shortblock or even longblock. If you live in the Tampa area i know a guy selling a 99 motor with everything on it for stupid cheap, he wont ship it though.
whats he asking,i live in wpb just got a 90 miata that the crank keyway might be getting ready to go on, possibly make a drive for a good priced replacement : )
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