A question on the 14cm housing install

[SnoDawg]

Greetings from a FNG I have learned a lot but I have not found any info on how the down pipe is modified for installing the non wastegated 14cm housing on a 93. Do you cut and weld? If so what material is the down pipe constructed from I has the look of stainless.

I have installed the pyro (post turbo my pyro is taken from a aircraft airstart unit and I have not ran across an adapter yet to put it in the exh Manifold)) and boost. I have about 650 to 700 deg when pulling up hills now this is unloaded (No trailer or load) and am seeing about 18 psi of boost. The only pump tweak I have accomplished is turing in the smoke screw in a 1/2 turn and it made a difference at the bottom end I know I need to advance the timing a bit which I will accomplish at work this week it workload allows. I am planning on a set of PODS once I get this housing install finished. Thanks for any input.

 

[Philip]

I think the non wastegated housing you do not need to modify the down pipe. It is only with the wastegated models you do.

 

[BushWakr - RIP]

As far as housings go, when you get to the 14cm (wastegated or not) you do need to modify your downpipe.

You need to look at the pipe, just back from the connection flange... you'll see that the pipe has a bit of a narrow neck which is oh... maybe 2 1/4" long. You need to cut the flange off just were the the necking starts, and then cut off 1 1/4" of pipe and weld the flange back on.

Some guys have had success by forcing the entire system back enough to accomodate the longer tail of the 14cm housing but that puts the downpipe real close to the firewall. In fact I think the heat shield hits. .

Once you have the modification done, you will have a similar problem going back to a larger housing like a 16 for example.



To do that you'll need a new downpipe, or and adapter to fill the gap.



As for the pyro thing, you'll find that your actual EGT will be higher than what the pyro is showing. A general rule is this: add 10*F for every 1 psi boost. That rule stops being accurate once you exceed about 20-22 psi. You can have as much as 300*F error when up in the 27-28 psi range.



Bob.

 

[SnoDawg]

Thanks guys, is the down pipe made from stainless?? if so I will have to have somebody else do the welding cause I do not have the equipment to do the job.

 

[BushWakr - RIP]

You know, it's been so long since I've had the stock exhaust taken off that I can't remember if it was stainless. I'm pretty sure that most aftermarket stuff is aluminized steel. Solely for corrosion inhibition.



I think the stock may well have been stainless. Anybody ???



Bob.

 

[boatpuller]

I've heard that the stock exhaust is stainless but the parts from the downpipe back that I removed laid outside the shop for a while and they rusted so I believe it is aluminized steel. I used steel wire in my wirefeed to weld the pyro bung for my turbo temp monitor into the down pipe and it's been fine for a couple years.



Hope this helps,



Caleb

 

[SnoDawg]

Thanks again

I was toying with getting a better exhaust so this will give me an excuse. I moved the Pyro last night to preturbo (found a fitting that worked) Amazing!! the response in the indicator lots quicker. I have not had a chance to take her out on the road to check EGTs yet. Thanks for all of your help

 

[SnoDawg]

Installes

Installed the Housing Last night and YEAH BUDDY What an improvement picked up a little bit of boost it comes on sooner. A bit of info: The Down pipe on my 93 is Aluminized steel so welding is not a problem. Thanks again Guys for the info. Now waiting for the PODs:-laf :-laf