OK everyone I've almost decided to go back to turbo.....I've rebuilt my motor yet again and slapped the 9.1:1's in there so I'mm back at stock compression damn its slow.....anyways.....at first i'm thinking a 5 psi non-intercooled system to start off utilizing the STOCK exhaust manifold....I was looking at it the other day and if I ported it it would have fairly to very good flow in it and I can make an adapter plate no prob to fit a T3 on there and as for the backpressure issue I thought of before I found a solution make a short test pipe inside the stock manifold to bridge the gap and use a rotating seal like what is on our exhausts and no more backpressure and a cast turbo manifold. Clearance isn't an issue I don't think in our cars since it seems that all callaway did was modify the falng on the stock manifold to accept the turbo. Anyways...I will use a FMU for now and just a 1st gen DSM BOV I have the fittings for oil and the feed line so we are talking a cheap and effective but not shotty quality turbo kit. Priced it up today at work anad I would only be looking at about 350 for a rebuilt 60 trim T3 from turbonetics, 30 bucks for a 1st gen DSM BOV, fittings i have lines i have, used 10:1 FMU for about 90 bucks, and my piping about 120 all together so i'm looking at around 600 bucks for the same kit i had before pretty much with an OEM fit just about. Any comments or suggestions let me know i'm breaking out the die grinder tonight to port the manifold.
Second Coming
- Thread starter chdesign
- Start date
I thought about using the stock manifold too. Here are my random thoughts...
The expansion of the stock manifold leading into the cat:
How do you smoothly transition from that huge opening for the origional cat into the inlet of the turbo? You can match the manifold outlet and then taper back down to the turbo. But then you would be expanding the exhaust gases in the manifold, then crunching them back down to go into the turbo. Would this setup have negative effects on boost response?
This setup would also place the turbo very low in the car. Will there be space issues? Will the stock manifold be able to take the extra heat cycles and the big fat turbo hanging off the end of it?
The expansion of the stock manifold leading into the cat:
How do you smoothly transition from that huge opening for the origional cat into the inlet of the turbo? You can match the manifold outlet and then taper back down to the turbo. But then you would be expanding the exhaust gases in the manifold, then crunching them back down to go into the turbo. Would this setup have negative effects on boost response?
This setup would also place the turbo very low in the car. Will there be space issues? Will the stock manifold be able to take the extra heat cycles and the big fat turbo hanging off the end of it?
Cast iron is very very very durable and as for the large opening it isn't much of an issue as i would make a taper as your described. By shoving the gases into the turbo as such might actually help spool time and even if there is a slight lip where the gas would be blocked it wouldn't be anymore than what the cat blocks it as it is. As for the fuel issues I will just use the FMU for now on my last setup it worked just fine for my 5 psi setup.
CH I hope you come back......... to the darkside......you have a lot to offer to the F/I community regarding tech issues.
The darkside...lured you it has(laugh)
The darkside...lured you it has(laugh)
powerful it is..........the force of the darkside(laugh)
BluMp3Turbo
Member
yea baby!!!! another has fallen!!!!
Na the N/A setup worked great till i sprayed it and lost compression I fryed my top rings. I just rebuilt it and put the old 9:1's back in. Since you know I was the 1st non-MP3 turbo protege I just figured i would come back to the same ole thing and do a new setup and maybe do one that would inspire other people to do the same a cheap effective turbo kit. The plate adapter thing sounds like a good idea liek I said the only issue I can think of is that difference in the size of the opening. The T3 opening is fairly large so I don't think there will be much of an issue and I can retain one stock O2 fitting and the stock EGR port along with people just looking down glancing seeing a stock manifold and maybe not looking for the turbo. From looking at the Mazdaspeed the header on it looks to be just the stock manifold we have with a different flange cast on it for the turbo. Seems it goes down just as much as our manifold and bends the same way. If i pu the turbo at about a 30 degree angle from the block i should have enough clearance to clear the piping and the downpipe without haveing to modify the engine bay. I'm going to do a intercooler setup later similar to the mazdaspeeds just with a larger intercooler but with the piping in the same routing position as it, in the top of the intercooler and out the bottom since heat rises this will pull as much efficiency as possible out of the intercooler and also save space and allow for no wild intercoler routings maybe this can be the prototype for that intercooler setup i told you about Terry. But in any case once again I will be turbo it may take me a couple months to sort everything out but it will happen eventually I think it took me about 6 months for my last one and I think this one will take roughly the same time....O yeah this time the downpipe will be 3" mandrel bent, TIG welded Stainless steel!!!!!!!!!!!
mikesmazda155
Member
WELCOME BACK CH
I now have the heart of the Project an IHI RHB5 turbo straight from Mazda R&D came off a test motor and has only seen 500 miles in its life prefect in every way and its all mine and the best part i know the guy that i dealt with and got it for a mear 100 bucks. You have never seen a turbo this clean unless is was new pic is attached.
Attachments
The VJ12 IHI turbo is about T28 size maybe a little larger about a standard trim T3 size but in a smaller frame its kinda nice. It only has a 1.75 inlet/oulet on the compressor but I'm only going to run 2" piping for quick spool. Now I just ahv eto figure out how I want to mount a intercooler....oh yeah I ditched the stock manifold Idea I'm going to make another custom manifold.
