dpf22

So some of you here may know me now. Most probably however, do not. As far as posts go, I am not a heavy contributor. I mostly read and look for good info.



Anyway, on to the good stuff. I have a 1987 TII dob 10/86.

I managed to have my electronic boost control solenoid stick closed and stop working last november causing a spike to something like 25psi on the stock turbo. (don't ask me, I didn't know the little guy had it in him)

Catastrophic engine failure since I had no fuel above 21 psi (megasquirt ems) Drove here home that night on 2 combustion chambers. Once I got it out and apart, I assesed the damages as one bad dorito, one good dorito, one bad housing, one worn out housing, all the irons were in good shape, so I reused them.



Here is what the build consisted of:

Pineapple med street ported s5 irons. Ported and slightly modified after the initial template was cut into the housing. Radiused and smoothed all transitions into and inside the ports.

Lots of time spent on the s5 intake manifolds. Slightly opened them up and smoothed/ gasket matched all transitions. The throttle body was ported, smoothed, and modified as stated in another thread keeping the 3rd set of throttle plates and actuating them open at a set pressure to help low end torque.



Inside the motor I have a stock s5 crank, stock new s5 stat gears. Lightened and balanced s4TII rotors and s5 counterweights (clr motorsports). Oil pump was replaced with new Turbo unit. All galleries entering the pump recieved a smoothing and gasket matching as well as velocity stacking the pickup and removing the screen. An FD regulator rounds out the oil system for now. I have also relocated the oil cooler outlet to the side of the iron and plugged completely the gallery to the front cover. (the omp is fed by a small gallery that gets bleed-off from the main bearings) I also have a mazdacomp oil pan baffle.



Outside of the motor I have the modified manifolds and a stock turbo, mazdacomp pulleys on the crank and water pump, greddy compression tube (modified out of dissapointment in quality), ebay intercooler and an awr racing double pass radiator (ultra cool). Oh yeah, I have a 2.5" downpipe, 2.25" midpipe and a stock catback. The car is very quiet. I need more exhaust flow lol.



Other than that its fuel and drivetrain mods. Lost of time and thought went into this build. Clearanced the side seals at .002" and haven't had any issues at all. It gets awesome compression and pulls VERY hard for the stock turbo. The engine is soo smooth running that I can't hardly hear it run and sometimes think it has died comming to a stop lol.

Anyways, here are the dyno charts. One made at 9psi with the stock turbo and the other made at 12psi stock turbo. Enjoy. Feel free to shoot questions at me. I didn't have time to go into the detail I wanted as I am just on lunch as of right now.

dpf22

So now that I am off of work, I figure i should add some more information.



The motor was put together with oem mazda seals on everything.

The ecu is a megasquirt that is tuned by myself. I haven't had the time or energy to get compression numbers. This; being my first build, is a big thing for me. I wasn't expecting more than 230whp mostly because I had dyno'd at this particular place before and it was dismal to say the least. The day that I did these runs was a friggin hot 98 degree low humidity day. I didn't even have a fan blowing air onto the intercooler. Albeit my intercooler is fed by the radiator fan because it sits right in front of the radiator.



Basically other than the internals of the motor and all the little things done to the irons etc, the setup is very simple.

I have 1.5' of 2.25" intercooler piping to the intercooler as well as 2.25' of 2.5-2.75" piping from the intercooler to the turbo.(all mandrel bent)

The intercooler is an ebay godspeed type L unit. I ground the openings to 2.25" from 2.1" to gain a little flow through the end tanks. It's roughly 2.75" thick and about 28" long and 10" tall. Sits right above the oil cooler and in front of the radiator.

Stock oil cooler for now

act hd pressure plate with stock disk. Love the engagement. We will see how it holds when I get a larger turbo. So far so good.

Fidanza 8.5lb flywheel. Not hard to drive at all.



Ignition consists of an msd digital six with 2 trailing coils as my leading ignition and stock trailing setup, magnecore 10mm wires and br10eix plugs. Runs really good so far... Obviously



I get about 50psi oil pressure at idle and peg the gauge at 110psi anything above 3000rpms.



Other than those things and the stated exhaust mods (or lack thereof) its a pretty stock looking car haha. I could post pictures, but you'd all laugh.

Thats all I can think of for now unless anyone wants me to list my suspension mods.

j9fd3s

nice numbers! it sounds like a really fun car

dpf22

Truthfully

It is surprising me every day seriously. I couldn't have asked for a better motor being my first build and all.

I actually got to run against an '04 porche 911 GT3 and VERY NARROWLY pulled him till 120mph.

Then today back from picking up a friend from out of town, I got to run a brand new hemi 300C SRT8 and pulled very solidly to 130.

My room mate has a 1998 Firebird with aproximately 350whp and I can put a car between us from a dig and 130-140mph.



This motor is a FREAK and I love it



dpf22

dac

Curious to know a couple of things. What Turbo are you running? S4/S5?



My motor sounds simular to yours:



I've started my new rebuilt motor once for about 30 seconds, but smoked out the garage (burning off the assembly lube). Anyway I can't back it out of the driveway until I get my driveline (Hopefully this week... The driveline is being made, and they had to order parts).



I'm running a Haltech e6K, Stock 550 injectors. Cleaned/Flowed by RC Engineering. But my motor is somewhat of a basteried Rotary.

S4 Rotors, RA Racing Seals/Springs, Solid Corner Seals. S4 Housings, Ported using Pineapple Racing Mid template. S4 Center Plate... Okay this is where it gets weird. N/A Front and Rear Plates. I like the additional intake timing the AUX ports give. It sounds like a little bridgeport. Anyway S4 LIM bolted to a S6 UIM and a front mounted intercooler. 2.5" piping. Stock S5 Turbo and Manifold with a 3" Downpipe. No Emissions. A Single Silencer to a 2.5" pipe.



Power goes through a 6 puke cermanic disc and a stock Turbo Flywheel and Transmission. Gearing is a crazy 5.125:1 Rear with a Locker in it. Weight is 2350 lbs... With me in the car.



I'm running an electric fan and a Haltech Boost Soleniod as well. The motor has Nitrous on it (Dual Foggers) into the intake ports.



I just need a few more items... Slicks, Driveline safety loop, Line lock.



My Motor timing looks something like this:



Primary intake (Center Plate)

Intake opens 25° ATDC

Intake closes 50° ABDC



Secondary intake

Intake opens 32° ATDC

Intake closes 30° ABDC



Auxiliary high speed ports

Intake opens 45° ATDC

Intake closes 70° ABDC



Exhaust (Housing no diffuser)

Exhaust Opens 84° BBDC

Exhaust Closes 48° ATDC

j9fd3s

stock turbo will limit you to about 250hp at the wheels, which is plenty in a 2300lbs car. seems like it works better at a lower boost too, ted just did 250ish @11psi, dpf22, did 12...

dpf22

First off, I made that power at 9psi at 4500ft altitude uncorrected, 3 more psi only netted 8 horses and around 20lb/ft of torque. My turbo is an S5 unit that is untouched except for the miles on it. I actually blew my last engine up with this turbo on it. Stock compressor and unported exhaust. The wierd thing about these numbers is mostly that I made them with a stock catback exhaust. I have a 2.5" downpipe and a cat replacement pipe (no cat) thats it for exhaust mods.



Dac, your motor is a little off mine. My rotors and counterweights are lightened to fd spec and then balanced to within a gram (a costly but worthwhile mod) then I have a fidanza 8.5lb flywheel with an act heavy duty pressure plate and a STOCK clutch disk. My irons are a slightly modified version of the pineapple racing mid streetport templates for the FC. All of my irons are S5 TII irons. Rotor housings are very lightly used s6 housings (for longevity) and I run premix along with the standard oil injection for that as well. Our motors couldn't be much more different aside from the compression ratio. The 6port irons are a very top ended iron. Don't expect the meat of your power till after 4k.

My motor has mabe 3k miles on it and runs rediculously strong. I haven't got my compression numbers yet, but I would assume by the dyno numbers that I have a solid 110psi per rotor or round about there.

My motor is a mutt of a lot of different stuff and ideas, but came together well. My next step is a larger oil cooler and larger turbo as far as power is concerned.

dpf22

haha, I get the feeling that a lot of people don't believe what I have. That or its just not very interesting lol. In any case, I would like a little input from people. Good, bad, its all welcome as long as it doesn't become a flame fest.



dpf22

j9fd3s

i believe it, and having had a similar setup (less power though) its gotta be FUN

dpf22

Yes WAY fun

I can't wait to get a larger turbo. But alas, I have to finish the rear suspension up with spherical bearings and adjustable toe links. Then I need to send these koni shoks out to be revalved and made double adjustable . This car was made to be driven thats for sure