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Discussion Starter #1
Hi everyone had some questions for a build I've been planning and buying parts for. Its just a motor Id like to build to have fun at an autoX/ Backroads and not lose that miata reliability. Really would just like to have a great botton end and tid bits around the engine so if I build up a lil more it'll be ready to go(itbs,99 head ect) So far I have my hands on 10:5:1 pistons, full header back exhaust, hondata intake gasket (does actually keep intake very cool) and a wideband setup. It also has a shaved head and will be getting a full port polish. Not made of money so have been buying when I can, trying to keep it at a decent price range. My questions are (just looking for opinion)
Cams? Not a must right now but anyone know a good setup for a all motor car.
Injectors? If ill need to run a slighty bigger ones and any sizes to think of
Fuel pump? Walboro whitch size wouldn't be overkill but will help out
Apexi afc will it be good enough to tune the motor safely? Mixed with a wideband,adj cam gears and fuelreg.
Thanks to anyone who can help a lil bit.
 

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Mostly Harmless
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Given your somewhat mild build, not sure how much you'd really need cams. However, if you want to pursue that avenue, take a look at Integral cams. Someone bought out their stock, profiles and whatnot, though I forget who at the moment. Your use of cam gears will depend on the cams in use. For the cheap setup, you can source a Mazdaspeed intake cam or a used BP4W exhaust cam for an exhintake setup. Plenty of reading can be done on this topic on the big miata board.
Injector sizing might well depend on what engine you're starting with. Details on the car? Existing injectors?
The fuel pump can, to some extent, be considered a wear item. How old is the car? If you want to upgrade in an NA car, the 190 hi-flow will do nicely. For an NB, i usually see the 250 recommended.
I'm totally unfamiliar with the Apexi pieces, so I'll leave that for someone else's comments. For the price, you might see if you can round up a used MegaSquirt setup, as they're pretty user-friendly, have a large user-base, lots of support, and will help get the most out of your completed setup.
You'll definitely want to utilize a wideband for proper tuning. An adjustable pressure regulator will depend on the existing fuel system (which year) and what injectors you end up using.

All opinions in this instance. There are others on here who will have more well-defined answers for you, hopefully.
 

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Emilio posted this in a similar thread I made back in May:

You didn't mention budget but here's my .02

3a.
JDM 01-05 motor with exhaust, downpipe and intake manifold. Use 94-97 airbox and crossover pipe. Make inconspicuous black steel spacer to replace MAF. Lock intake cam gear at 30° overlap. MS DIY PnP. Make 155whp on CA91 with high flow cat and good exhaust. Look 100% stock under the hood.

$1500 JDM pullout
$450 MS DIY PnP
$200 dyno time and Church's
$200 cam indexing at Keegan Engineering

3b
$1400 99-00 JDM motor and intake manifold
stock ECU, AFM
Make around 125whp and look stock.
 

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Discussion Starter #4
Thanks jux. So the cars a 94 with its original motor. I was thinking of the exhintake cam swap,just didn't know if there were aftermarket mild ones. Ill probly just go with that but still just keepin a eye out. The injectors are the stock 260 I believe and that stock fuel pump does have atleast 200k on it. Am goin to replace it that's why I asked about walboros. 190 seems to be the right one. Adj cam gear I'm goin to run anyway just incase it hits a dyno and I really start playing. Megasquirt definatly the smarter way too go. As for the adj fuel reg id run with the 190 pump for just a couple psi bump like 50psi. That's why I ask about injectors incase all these parts together is too much to push throu them. Thank you again for input good to hear peoples thoughts and open to more.
 

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Thanks jux. So the cars a 94 with its original motor. I was thinking of the exhintake cam swap,just didn't know if there were aftermarket mild ones. Ill probly just go with that but still just keepin a eye out. The injectors are the stock 260 I believe and that stock fuel pump does have atleast 200k on it. Am goin to replace it that's why I asked about walboros. 190 seems to be the right one. Adj cam gear I'm goin to run anyway just incase it hits a dyno and I really start playing. Megasquirt definatly the smarter way too go. As for the adj fuel reg id run with the 190 pump for just a couple psi bump like 50psi. That's why I ask about injectors incase all these parts together is too much to push throu them. Thank you again for input good to hear peoples thoughts and open to more.

you can actually have your OEM cams re-welded and ground to a more aggressive angle if you want to save money and stick with OEM-like part. there's a funny but legitimate guy on ebay selling cams done this way i think his handle is "guyinashed" or something. its just refurbished OEM cams ground to like a 270 degree or something. budget stuff but it works. also there is a guy in the for sale section dishing out 2nd gen supra injectors, 305cc, for like $30 a set.
 

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Got my eye on this thread. I wanna keep my 1.8 NA for reliability but the only difference between TS and I is he autocrosses while I want to do lapdays 2 days in a year.
 

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Discussion Starter #7
I had no clue that that could be done to the cams. Ill take a look at some profiles and check cost with my machinest. Cait go wrong with those injectors so cheap even if I don't use them. Plug and play too! Sweet. As for anyone following this thread I know I won't be wrenching for a while just buying here and there. So no testimonials from me for a bit sorry. Have a wicked pissa X-mas everyone
 

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Buy a mazdaspeed cam from 949 racing, green top supra injectors, a megasquirt. No need for porting at your levels. You'll lose low end torque from it. Do some research and buy a junk head to get the feel and polish it up yourself. Mainly what you'll want to do is remove any gobs of casting imperfection and port match the intake and exhaust sides of the head, and maybe deshroud the valves if necessary. A lot of heads don't even need that. Good choice on the pistons though, it's a good compression choice, although with a shaved head you're gonna start getting close to 11.1.
 

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Sorry for threadjack, but what would similar modifications land me on a 1.6? 100whp?

Im all down for this concept, id like a tad more power but if possible improve the reliability aswell. is it worth modifying the 1.6 vs 1.8 swap+ very mild mods?
 

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Discussion Starter #10
But does the mazdaspeed cam fit into pre 99 1.8 heads? Or is the cam mounting the same. I thought it was a different head along with solid lifters. Can you run it with the old HLAs
 

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But does the mazdaspeed cam fit into pre 99 1.8 heads? Or is the cam mounting the same. I thought it was a different head along with solid lifters. Can you run it with the old HLAs

Bubba, if you're sticking with the pre 99 heads, exhintake. It's simple ****.
 

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Sorry for threadjack, but what would similar modifications land me on a 1.6? 100whp?

Im all down for this concept, id like a tad more power but if possible improve the reliability aswell. is it worth modifying the 1.6 vs 1.8 swap+ very mild mods?
On the 1.6, you can get 100whp with bolt-ons...assuming that power measurements are done the same in your area as in the States.
My 1.6 with 220,000+ miles on it and unknown compression/leakdown did about 103whp with stock computer, AFM in place, airbox removed and replaced with a cone filter, header and decent catback exhaust. It pulls like a champ, too, all things considered.
If you want some basic gains, replace the engine computer with something tunable that's available in your area, remove the AFM, and add the usual bolt-ons.
However, you do get the additional torque and greater selection of upgrades with a 1.8 engine...and in the case of an engine swap, the 1.8 is already out of the car and available to pull parts for headwork, gasket-matching, etc.
 

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Buy a mazdaspeed cam from 949 racing, green top supra injectors, a megasquirt. No need for porting at your levels. You'll lose low end torque from it. Do some research and buy a junk head to get the feel and polish it up yourself. Mainly what you'll want to do is remove any gobs of casting imperfection and port match the intake and exhaust sides of the head, and maybe deshroud the valves if necessary. A lot of heads don't even need that. Good choice on the pistons though, it's a good compression choice, although with a shaved head you're gonna start getting close to 11.1.


My plan is to replace my 97 1.8L with a +01 VVT engine next spring or summer. I was considering doing 11:1 CR pistons with 2mm overbore to increase displacement to 1.9L. But I'm not so sure about the bigger pistons, I should probably leave it with the stock pistons, just shave the head to increase the CR.
I've seen the 84.5mm Supertech pistons at TrackSpeedEngineering for $389, but I'll have to add the cost of the build and the extra bits that go along with that. But I have to wonder what kind of torque gains I would get from the extra 0.1L of displacement.
 
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