Bad A$$ SOHC turbo

[JWMotorsports]

I need to pull my old SOHC engine out of the barn and start comparing port sizes, valve sizes, & quench areas of the combustion chambers vs. my J-Spec B6T head I'm using a die grinder and carbide bur on

You all think the SOHC is crap...I bet you the rods are the exact same small b6 rods used everywhere else. Racing Mazda and then myself have proven those rods can take over 400WHP for a little while (mine took it for 10,000 miles). The only major set back then would be the cyldiner head design. Port size, valve size, and quench area. The other obviouse set back is the OEM cam duration and lift. Web Cams, or someone of the likes could probably make a custom spec cam for pretty cheap. One possible advantage to the SOHC is that there is less rotating mass (ie less parasitic drag) from the single cam vs. the twin cam. I'm seriously wondering if the SOHC head would out flow the GTX DOHC head. It may use the same valves the MX-3 DOHC engine uses which I belive are larger than the GTX's.

With a Garrett GT3071R series turbo or an Innovative Street Heat 57 with a .63ish a/r exhaust housing & Tial 44mm external gate would be NASTY on a stock SOHC @ 26psi with a standalone & 1000cc injectors (of coarse you need a good intercooler). 300WHP in it's sleep


Mini...you need to build another monster

[projectmx]

i don't think the SOHC is a piece of c*** and I doubt everyone thinks that of it either, i'm sure there are some who do though. That is awesome someone reached around 400whp with one but i'm sure they spent loads of cash to do it. For me the reason I wouldnt' have gone with one is simply I wanted and AWD mx-3 with easy to find parts and easily attainable 250-300 whp i've spent around $4500 so far and that includes car / engine / AWD system / all of the aftermarket engine and drivetrain goodies / racing seats. I'm sure i'll be spending another grand or so before she is completely done but you also have to remember i have completely rebuilt the engine with a bunch of aftermarket parts, bought tools, sheet metal, paid for engine work to be done, and bought other items so i'll have an entirely new car custom built for about $7000 or less total and i'll have between 250-300 whp at all 4 wheels (i'm sure it will be capable of more but I won't run the psi all the way up). When compared to spending $3000 - 6000 to get the SOHC up to 200-400 whp at only 2 wheels and that not including buying the car and making it look nice well i think my money was pretty well spent. The fact that I and other haven't used the SOHC has nothing to do with being scared of it or not knowledgeable enough to do it... that engine simply couldn't give us what we wanted

but i do wish you luck on the SOHC and can't wait to see how it turns out, i hope someone does it cause i've always wanted to see what kind of hp it could put out, especially with the racing mazda turbo cause that one looks good


edit ... i also spent somewhere between $100-$200 replacing parts i so wonderfully broke on accident (ahhhh the joys of learning)

[Limegreen mx-3]

Iam already getting 1.6 sohc turboed for racing mazda we are going to redesign some parts. i have to do it ric way so am not complaining. will be using a GT32 turbo his kit intercooled and 550cc injecters megasquirt not a big fan of it. i want a tec II but ric wants that setup to make 350whp. if the megasquirts works ok and can produse that power RM can sell a turbo kit with a engine mangement can can make that power 350whp.

I am going to push the sh;t out of it just because i want to and have a spare sohc should the fist go.

JWMotorsports by the way when i was taking apart both sohc & dohc mx-3 engines thier the same rods and different domede pistons, the sohc even comes a gurdle guard shock me some FWD BP's have these. and the dohc have a really stout gurdle guard ric thinks its better than the sohc and was talking about knowing that now. He wants to boost the sh;t out of a 1.6 dohc mx-3 engine.

just a matter of weeks maybe a month untill its all done. RM going to make 350whp on a sohc. or at least thats the goal.

[soulsynchromachine]

thanks for keeping us posted best of luck

megasquirt ftw

[Boris]

I'd be curious to see how much RM will charge for the new turbo kit (if everything works well) I'm interested in it, but considering a non-intercooled basic turbo kit goes for $2000, I'm not keep my hopes up

[Limegreen mx-3]

thanks for keeping us posted best of luck

megasquirt ftw

I don't want to use a megasquirt II but iam having a hard time finding a used tec II. time is creeping and i need something, will make ths MSII work even it doesn't want too.

[JWMotorsports]

Lime...the GT32 from Garrett isn't an "R" series turbo. They are journal bearing. It has a smaller compressor wheel than the GT3037R and a larger turbine that falls between the GT35R and the GT3037. The GT32 only supports up to 420HP (I've seen DSM's put 450 to the wheels with it). The megasquirt should actually work well on any turbo as long as you have a high flow fuel pump and a good responsive pressure regulator. I'd recommend atleast 650cc low impedance injectors for that setup and tune it a little rich in the area that the turbo ramps up hard in. The Mega Squirts maps are pretty small for fine tuning but work well if you group your tuning points around where the turbo comes on strong. A good pressure regulator will do most every where else. The other place you want your tuning points is idle and crusing rpms for driveability. You may want to consider a larger capacity fuel rail for the kit as this will help a lot with tuning especially where the turbo ramps up hard. I'd recommend an -8AN fuel rail for this application as a -10AN would need an expensive pump or twin pumps under large fuel demands. Can't wait to see the results!

[Limegreen mx-3]

sorry it wsa a typo i know that about the R thing wasn't paying attention on what i was typing. not my call on the inecjters and points u pointed out this will be ric setup and iam not going to ? it . whe its all done and thers nothing else to prove on the sohc. them its back to my BP and will be my setup and how i want it.. iam just going have my mx-3 as the test car and give that sohc& trans a beating of its life. the bp setup is what i really want. iam just like u wondering what the results will be like. it better be fun to drive ric 1.6 dohc miata setup (now a customer car) ran a 13.8 on 5psi surpise us what a 5psi can do wonder what 10 abd up will do.

[Limegreen mx-3]

well here's a little peice of what RM is doing we are crazy guys thats love to kick a-- and love to hear what are u guys running that car is fast. oh just a little turbo 1.6 sohc.



its the underdog 1.6 sohc mated with the g-seris trans extreame act clutch

the halfshaft had to be cut and modifited to bolt up to the block

the trigger wheel kit

yup all bolted in the MX-3
TEC III 440cc injecters, custom fuel rail, as what ric is going to do its up to him what size turbo how knows

[Boris]

nice man I'm excited to see how this turns out!!

[papa roached]

makes me miss my old SOHC

[BuGS]

makes me miss my old SOHC

not me

[justice]

Y do these get no attention, is it that no one is skilled are smart enough to make them work and make power. I would like to know why its always toss out for the BP or 6 cylinder, just to make 100 or low 200 hp the other ways when you can do the same thing on the SOHC. It a dam shame

What your take on it?

hello,

i know it can be done i like to tune cars were ohter people think it can not be done.

i am ready to boost up a sohc 1.6 with a turbo.

i am asking you can you please send me all the information and i will fix a mx 1.6 sohc with at least 200 hp.

i have a te0h4 turbo sitting here, turbo piping, a stock engine rebuildkit.
and no i am not poor or rich but i have enough.
i have a audi tt 1,8 turbo 5valve technic. but that is the companycar so i can not tune that one i want a car to drive in the weekends and just cruise.

so come on help a tuner out.