Tbi header stage two!!!!!!!!

[turboking]

Redoing my 8 valve lancer. Looking at my options, decided to make a tbi header that will have the turbo in the same relative location as the stock turbo exhaust manifold. Not all the way to the passengers side(the problem with the current tbi design), No more issues with swing valves. Must use the smaller starter(bosche).

[detobias]

wow!

[turboking]

more pictures

[detobias]

couldnt u find a BIGGER turbo ??? OMG ...

[shadow88]

Could you show it in place with the factory style swingvalve?

[boost geek]

I don't think that will clear the firewall on an L body...

[moparfreak3]

A hammer will make anything fit

[turboking]

(I don't think that will clear the firewall on an L body...)

Has to, I am using the same tbi manifold as a starting point

(Could you show it in place with the factory style swingvalve?)

Dont have a dead t2 turbo, will look

[turboking]

(Could you show it in place with the factory style swingvalve?)

Heres is two pictures with a diago 3 inch down pipe on a mitsu turbo

[crusty shadow]

uh no offense but that looks like shyt. the tbi manifold will flow considerably less air than a turbo manifold. ports are smaller, and those flow dividers are a huge restriction in airflow as well. plus that doesnt look like it will clear ANY firewall. you'll need a hell of a BFH to make room. the ports arent equal length on a tbi manifold , so theres no gain from that either. a ported stocker will perform better than that nasty mess. did you heat the casting in an oven before welding? if not it will crack right where those welds are every time.
nice idea but in reality it is a waste of time.
better off spending money on a tubular stainless hedder, will easily outperform that or a ported stocker. if you've gotta have cast iron id go with a TU cast iron manifold. it has minor issues with fit but those are easily addressed with a die grinder in 20 minutes.

[turboking]

Crusty.

No offense ,but have u ever welded these tbi manifolds. If u "DID" u wouldnt make a stupid statement like "did you heat the casting in an oven before welding? if not it will crack right where those welds are every time".

I made over 50 (fm style headers) sold them on ebay , to wholesalers,etc . Never had one come back for a weld failure . The issue was always" MAKING THE SWING VALVE FIT". With this design that is taken care off- look at all that room between the header flange and the power steering pump.

Another stupid statement "that doesnt look like it will clear ANY firewall" If the fm style will fit so will this, starting out with the same tbi header!!!!!

You are right about those flow dividers. I am going to machine those out. Please understand this is the first one , improvements will be made

[shadow88]

Well, you take this any way you like. I've built a tbi header and I'll stick with it due to my personal power increases. I don't see an advantage with your turbo placement and the obvious mods you needed to get to that point.

You mentioned in post #1 that "No more issues with swing valves." yet it's pointing right onto the steering rack. You'll see when it's installed in the car. I've never had a problem with my turbo being "all the way to the passenger side". I have room. Hell, I MADE room.

But so far, I don't see a real improvement over the regular tbi style turbo header. Unless this is going into a RWD car, you have alot still to do.

[Ondonti]

Are you going to put an external wastegate on that hole on the side?


I dont think this project is a good idea but I am all for people trying to use external gates.

[tkelly27]

It's really the cooling that's the issue. It's a cyclical loading issue leading to cracking more than an instant failure too. You sound like you know what you're doing, but it's advised to cool the piece down slowly in sand or an oven and to make small welds so the heat input is localized and alowed to cool slowly.

Maybe it's cheaper for you to get TBIs and mod them, but I'd rather make a full on tubular unit. Looks nice, good luck with it.

[crusty shadow]

Quote:

Originally Posted by turboking Crusty. No offense ,but have u ever welded these tbi manifolds. If u "DID" u wouldnt make a stupid statement like "did you heat the casting in an oven before welding? if not it will crack right where those welds are every time". I made over 50 (fm style headers) sold them on ebay , to wholesalers,etc . Never had one come back for a weld failure . The issue was always" MAKING THE SWING VALVE FIT". With this design that is taken care off- look at all that room between the header flange and the power steering pump. Another stupid statement "that doesnt look like it will clear ANY firewall" If the fm style will fit so will this, starting out with the same tbi header!!!!! You are right about those flow dividers. I am going to machine those out. Please understand this is the first one , improvements will be made

no i have never welded any TBI manifold, nor would i try. i dont see the point of taking a part that was designed for the airflow of an engine that made 100 hp and trying to make it work on an engine that would be capable of 300+. just doesnt make sense. have you tried that in a car yet? you'll have more fit issues than you think. have plenty of room between the pump and swingvalve, but what about the steering rack, firewall etc? rack problem can be addressed with a new downpipe, but that adds significantly to the cost. im sure machining those dividers out wont be free labor either. still have unequal length tubes on the manifold though. ports are smaller too. for all the work that you have to put into it its not cost effective at all. you'd be bucks ahead to start from scratch make a nice tubular hedder that wont suffer from all those problems. after all the work is done how much are you planning on selling those for?
the whole thing makes me think of trying to cram 10 gallons of shyt into a 5 gallon bucket. it can be done with enough equipment, time, engineering and money, but is it really worth it when making a 10 gallon bucket would have been done much more quickly and easily?
work smarter, not harder - Scrooge McDuck