DIY Turbo Discussion greddy on a 1.8? homebrew kit?
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250-300WHP Build

 
Old 03-14-2019, 03:32 PM
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Again, wouldn't it be cheaper to piece the rebuild kit separatly? If you're on a set budget like you keep mentioning, you should piece togethet the gaskets to see how much money you might save.

The mishimoto radiator will work but you might need a adapter radiator hose so that it reaches the radiator inlet. Something like gate hose # 22382 might work. I don't recall how tight the squeeze was.

+1 for Scroggins, I just picked up my short block from them 3 days ago. They do excellent work.

Edit: If you want, I can look for the "new" oil pump that I got from the PO of my short block. I will have to look to see if I still have it.
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Old 03-14-2019, 03:53 PM
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Originally Posted by matrussell122 View Post
Might as well swap stock pistons for supertech and use arp rod and main bolts too.
Originally Posted by Savington View Post
Now we're getting somewhere.

Stock pistons are fine up to 300whp with good fuel and careful tuning. ARP mains are a requirement at 250whp+ IMO. OEM oil pump is fine at 300whp, but reusing old oil pumps is like reusing condoms. New Mazda oil pump is
Okay so new oil pump.. Conflicting on the pistons though. I'm going to stick with the stock ones, I don't plan over 300whp to keep my 6-speed in one piece. But I'll add main studs to the list, the Manley rods already have ARP bolts included.

Originally Posted by skylinecalvin View Post
Again, wouldn't it be cheaper to piece the rebuild kit separatly? If you're on a set budget like you keep mentioning, you should piece togethet the gaskets to see how much money you might save.

The mishimoto radiator will work but you might need a adapter radiator hose so that it reaches the radiator inlet. Something like gate hose # 22382 might work. I don't recall how tight the squeeze was.

+1 for Scroggins, I just picked up my short block from them 3 days ago. They do excellent work.

Edit: If you want, I can look for the "new" oil pump that I got from the PO of my short block. I will have to look to see if I still have it.
Well I can get a gasket set from Jim Ellis Mazda, that would save me a lot since I already have a new timing set and I'd still have everything I need. The kit from them is $202.50, I would just have to buy the ACL bearings, spark plugs, and sealant separately. Thanks for the hose part number, I'll reference it if I end up needing it. I'll look into the condition of my oil pump and see if it needs to be replaced, if so I'll let you know!
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Old 03-14-2019, 04:09 PM
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Check priority mazda parts in Tyson VA - I usually find them to be cheaper.
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Old 03-14-2019, 04:13 PM
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Would you look at the condition of your condom before you used it again?

Get a new oil pump like the pro said. Please.
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Old 03-14-2019, 04:15 PM
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Use once then leave it off for the next go round. So just leave the oil pump off when you go to run the new motor.
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Old 03-14-2019, 04:15 PM
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Well, that was nice while it lasted.
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 03-14-2019, 06:11 PM
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I've debated whether or not to post anything. Your machine shop will tell you if you need to bore the block or can get by with a hone after they measure it. Then they will tell you how much of an overbore you will need, just like they will tell you if you need to turn the crankshaft down or not.
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Old 03-15-2019, 07:45 AM
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Originally Posted by Savington View Post
reusing old oil pumps is like reusing condoms
I just threw up in my mouth a little bit but jesus point taken on that
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Old 03-19-2019, 06:50 PM
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Originally Posted by ryansmoneypit View Post
Would you look at the condition of your condom before you used it again?

Get a new oil pump like the pro said. Please.
Will do, OEM ones aren't that expensive anyway.

Oh, I got a deal on a $200 motor, BP6D so it's direct plug and play lol. But this means I can really take my time with the build, can't make the people on here pissed lmao

I got my tax refund, this is what I ordered in:

- Supertech 84mm 11:1cr Pistons and Wiseco Rings
- Eagle Rods
- ARP Head and Main Studs

I'm actually waiting to buy the bearings, so I can have the machine shop tell me what I need like advised. I'll buy the new oil pump and OEM gasket set here in a week, that's all I could get out of my pretty small return lol
I'll have the shop overbore to 84mm, and hot tank, X-ray, and deck the block along with the crankshaft and head work previously mentioned.

I went 11:1cr; with the gas quality here in Texas, 93 is already pretty damn knock resistant from previous experiences and E85 is really easy to get if I end up needing it. I know I was going to stick with stock pistons but the more I thought about it and considered the differing opinions, I decided to order them too since I have the second engine to rebuild and I don't need everything on hand at once. Also couldn't stand the sight of old stock pistons with brand new rods...

Thanks for the advice guys, I know I was pretty arrogant and didn't want to take it but I'm sure I'll end up with a much more well running and reliable end product.
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Old 03-19-2019, 07:05 PM
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I'm giddy with excitement for the obligatory melted piston photos!
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Old 03-19-2019, 08:56 PM
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Please video the first couple passes with boost in 5th or 6th gear. Some good pulls from 1k rpm on up. Dont puss out.
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Old 03-19-2019, 09:37 PM
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Don't forget to use these Supermiata HB ARP head studs to hold all that power in. Just torque to 90 ft-lbs like the instructions say
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Old 03-19-2019, 10:06 PM
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Originally Posted by Mudflap View Post
I'm giddy with excitement for the obligatory melted piston photos!
Originally Posted by ryansmoneypit View Post
Please video the first couple passes with boost in 5th or 6th gear. Some good pulls from 1k rpm on up. Dont puss out.
What's a better option? 9.5:1? I don't want to go all the way down to 8.6:1, then I'm just running more boost for the same power level. That is why I chose 11:1, I know combustion temps can get very high but there's ways to work around that, WMI for instance.

Edit: I'm asking because I can change the order before it ships.

Originally Posted by psyber_0ptix View Post
Don't forget to use these Supermiata HB ARP head studs to hold all that power in. Just torque to 90 ft-lbs like the instructions say
Aren't these the same thing?

https://fab9tuning.com/arp-head-stud-kit/
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Old 03-19-2019, 10:19 PM
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you want 9.5:1 pistons for 93 and e85 mixed use.

pump gas only you want 8.6:1

11:1 will knock on pump gas with any respectable amount of boost, so running e85 is pretty mandatory.

have you ever seen any one run 11:1 pistons here??

who cares if you up the boost by 1-2 psi to compensate for the lower compression? boost is free, pitted/melted pistons from DET are not.
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Old 03-20-2019, 01:19 AM
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9:1 will give you NA8 stock power with plenty of room for timing and boost. 11:1 is ****** insanity
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Old 03-20-2019, 01:45 AM
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Originally Posted by achulz View Post

Aren't these the same thing?

https://fab9tuning.com/arp-head-stud-kit/
No, that's not the heavy duty one. What Supermiata is advertising is the Chrysler 2.2L 4cyl headstuds to be used in miata heads. Thicker diameter stud. Tested up to ludicrous boost according to their site.


I use the ones that you linked, but I'm low compression (8.6:1) and not pushing ludicrous boost. Had I known I'd have access to e85, I'd have gone with higher.
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Old 03-20-2019, 02:29 AM
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So, uh, does anyone want a set of 90-05 Miata ARP studs? I feel like I always buy expensive parts just before better options come about.
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Old 03-20-2019, 05:26 AM
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11 to 1 is for naturally aspirated engines or e85 only. 8.6 is used for 93 octane and big boost. 9.x will cause your timing map to be more detonation limited on 93.
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Old 03-20-2019, 09:08 AM
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Originally Posted by TheScaryOne View Post
So, uh, does anyone want a set of 90-05 Miata ARP studs? I feel like I always buy expensive parts just before better options come about.
It was mainly in jest. You should be fine
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Old 03-20-2019, 10:52 AM
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Originally Posted by borka View Post
you want 9.5:1 pistons for 93 and e85 mixed use.

pump gas only you want 8.6:1

11:1 will knock on pump gas with any respectable amount of boost, so running e85 is pretty mandatory.

have you ever seen any one run 11:1 pistons here??

who cares if you up the boost by 1-2 psi to compensate for the lower compression? boost is free, pitted/melted pistons from DET are not.
I changed the order, got 9.5:1.
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