Hi guys,

Have previously posted on here about undertaking this conversion, but the difference is now the money is here - so I am ready to start, so want to confirm we are covering all the bases.....

My car is an 86 Euro Spec NA - Factory Fitted Electronic Dizzy (not cas), headers and exhaust fitted no internal mods - best current ET 15.5 at 90 Mph

We are retaining the factory ignition but are removing all the fuel injection and its associated hardware.

Fuel Supply is:

Brand New 48mm IDA Weber with 13b Low Rise Intake Manifold

Holley Blue Fuel Pump and Regulator (the factory intank pump will be removed).

The motor will be pulled from the car shortly:

I have 13B Turbo End Plates which we are going to bridgeport using the Mazdatrix Template. Just looking at the turbo Plates - there doesn't look like a hell of a lot of room to work with in regards to adding the Bridgeport Eyebrow?

I am not doing the Exhaust Ports as we are retaining the 6 Port Housings - so the diffussers will be in place - have seen else where in this forum that drilling them out may not be wise.

I cannot afford at this stage to replace the Apex Seals - we will be putting in a complete new gasket set ordered from Mazda. My motor appears to be sound, which my mechanic agrees on - hence the reason the seals wont be replaced, but I realise chopping big ports into a 15 year old motor is asking for a certain degree of trouble, I am taking a bit of a gamble in the fact that a middle aged lady owned it before me for 14 years and she really nursed it.....

Am also putting in twin belt pulleys to remove the slipping belt since the air pump has been removed.

Once the injection is removed - does the EGR Port need to be blocked off? Or is this standalone?? I would like to block this off anyway.

I am told we have to block of the Injector Feeds in the Motor? or u can leave the injectors in place but it looks pretty ugly?? Not 100% sure on this....

If anyone has undertaken this conversion mentioned I would be grateful for all assistance - AFAIK I am the first person doing this to a NZ New S4.....

Am hoping to run low 14s with this setup

Dont flame me too much for my limited knowledge, have never built a motor like this before - have always just got in and driven them!!

Cheers

 

I would take out the exhaust diffusers since bridgeports really need a free flowing exhaust. Once the engine is apart you can remove the pins in the exhaust sleeves and take the sleeve/diffuser out. Then get some junked TII housings (easy task...) and use those exhaust sleeves.

Racing Beat sells the injector plugs for the intermediate housings.

Are you eliminating catylitic and putting in free flowing cat-back to help the bridgeport breathe?

I would have gone w/ Haltech and TII turbo, manifold and adapter. HP and torque, not to mention quiet :-)

 

The car currently runs custom twin 2" Primaries of the motor into a single 2 and 1/2" System out through a 5" stanless rear muffler - the converter is long gone - I think my existing exhaust is up to the task - should have a healthy idle - not too neighbour friendly though!

Have been down the 13B turbo route it nether really floated by boat

I want an NA bridgeport in a series 4 chassis simply because no one has really successfully done it yet it NZ.. A couple have been done but in turbo chassis' and done very roughly.....

Thanks for the info about the exhaust sleeves - amazingly, very few workshops in NZ touch exhaust ports they only do intake....

 

Sounds cool, keep us posted.

 

Welcome to why i dont trust or listen to any of the NZ builders or tuners. Guys like Peter (Rice Racing) and Chris (Crispeed) have forgotten more about rotary's that 99% of kiwi 'experts' have ever learned.

 

If a 13BT wasn't enough then your BP is going to disappoint. With only a 48IDA and the untouched NA exhaust ports you'll be lucky to get over 240hp, which is just a mildly tuned 13BT with less torque and more noise (remember the cops are cracking down on that now). Sorry to sound negative, I just don't want you to be expecting more than you'll probably get. There are a few good reasons why no-one else has done it...

 

If a TII didn't float your boat, and you think an NA B-port might, but NZConvertable is doubting it, then why not get a Bridgeported TII... that will not long float your boat but blow it out of the water!

 

Fair comments, but at the moment the cost of a turbo conversion with stand alone engine management
and its many required accessories is not within my humble price range nor is outright power my main
goal, I'll leave that to the big boys with money to burn....

I have never owned a bridgeport before, but have owned many NA stage 2's and 1 13B turbo to date -so
I am determined to go down the NA bridgeport route, it’s the noise and powerband of one which
introduced me to rotarys at the age of 16, and has been a constant fascination since - also as my car is
factory NA I wouldn't mind to keep the motor in line with the vehicles original motive of NA power considering there is less than 50 left on our roads in NZ..... Am I
crazy? Probably

I have owned a mildly modified turbo Rx7 and lancer RS - and they were both sending me down the path to financial ruin, at least with the bridge the path may take longer to travel.

By all means I will develop the motor over time by opening the exhaust ports etc etc = Eventually I would love to run a peripheral port in it.

Cops are cracking down on hoons not law abiding Rotary Club Members like myself who leave the racing for the track and whos cars are tucked in the garage when the sun goes down.

As I mentioned above I am not looking to be the fastest car on the road, just one which is unique and built to my specs with a nice suspension setup and if I can get 240hp out of the initial build, I will be more than pleased....

But your constructive criticism is noted and welcomed..



PS you sig is a constant source of enjoyment

 

I purchased a complete car (not an rx7) with bridgeported motor and IDA today with my Engine Funds - so things have hotted up so to speak....

I am now unsure of what the future holds for my NA.

 

i have tha same setup in my 85 gsl except with a holley 650.. fpr... racing beat intake manifold exhaust no cats..msd... 4 port bridge and i ran 13s ez... stock 3.90 diff too... i recommend goin turbo 2 tranny n 4.10 lsd.. also doing 2 port bridge... way more reliable in my opinion... and u get tha same pull to 9500 rpm..

 

do both the NA and T2 have the same 6-port induction system?

 

I agree with blue T-II. If you can't run the T-II exhaust sleeves then take yours out. If you do, port them out WAY big like Rice Racing big. This will really help the bridgeport breathe. The diffusers may create more problems and cause your gains to be little for the time and money spent. If you need a quiet car then use a Warlock race muffler. It is the standard restrictive S-shaped 'turbo' style muffler but there is a bypass which makes it a loud, unrestrictive straight through design. Just install a Q-tech motorized cutout and you can have a quiet car when you want it or a loud one when you need the power at just the flip of a switch. I have this setup on my first gen and it is very fun.