First Post - Warped Downpipe - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools
Old 04-27-2008, 02:29 PM   #1
Newb
Thread Starter
 
Join Date: Apr 2008
Posts: 5
Total Cats: 0
Default First Post - Warped Downpipe

Hello All -

I am new to this forum - I have a '92 1.6L with one of the early FM turbo kits with the IHI turbo and Link (MKII) engine management.

Recently, I had to have a crack in my downpipe welded and in doing so ended up with a slightly warped downpipe. It's not a major problem, but not the distortion in the pipe is just enough to cause the exhaust to contact the power plant frame just behind the cat.

Any suggestions for "adjusting" the shape/angle of the downpipe? I thought about heating it up and trying to bend it, but have concerns that may lead to more cracking.

Thanks!
Red 92 Turbo is offline   Reply With Quote
Old 04-27-2008, 02:50 PM   #2
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

I'd adjust the point in the pipe that makes contact with a big hammer. That'll keep your volume and alignment. Just won't be pretty - fortunately nobody will see it.
m2cupcar is offline   Reply With Quote
Old 04-27-2008, 06:58 PM   #3
Elite Member
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

bend the hanger on the midpipe a little.
Arkmage is offline   Reply With Quote
Old 04-27-2008, 08:09 PM   #4
Senior Member
 
Join Date: Nov 2005
Location: Baltimore Maryland
Posts: 1,010
Total Cats: 8
Default

stick a crowbar in ther and pry it over. Also consider using a band clamp on an exhaust hanger to pull it away
airbrush1 is offline   Reply With Quote
Old 04-28-2008, 12:04 AM   #5
Newb
Thread Starter
 
Join Date: Apr 2008
Posts: 5
Total Cats: 0
Default

I have thought about trying to bend it without heating it up but was concerned that I'd crack the turbo outlet housing. I guess the other option would be to take the downpipe off (ugh) and try to bend it off the car.
Red 92 Turbo is offline   Reply With Quote
Old 04-28-2008, 10:32 AM   #6
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

The problem with bending it off the car is you don't know what kind of change you're making without reinstalling it. And you're right - using mounting points to leverage a bend does stress them. Whether or not your concern is justified is another question - but denting the pipe avoids those issues at the price of aesthetics and flow.
m2cupcar is offline   Reply With Quote
Old 04-28-2008, 09:26 PM   #7
Newb
Thread Starter
 
Join Date: Apr 2008
Posts: 5
Total Cats: 0
Talking

The worst part of the problem is that the pipe is touching the PPF at the flange behind the cat and rear section of the pipe. Unfortunately, I really can't deform it there to keep it from touching. It doesn't sound like there are any good fixes without taking the pipe off to adjust.

Oh well....as I told my CFO (aka my wife), I guess its time to pull the IHI turbo off the car and install a new Garrett turbo and downpipe. Sounds like the only REAL solution to the problem.
Red 92 Turbo is offline   Reply With Quote
Old 04-28-2008, 09:32 PM   #8
I'm Miserable!
 
Join Date: Apr 2008
Location: versailles Ky,
Posts: 92
Total Cats: 0
Default

post up some pics please
boostinboy is offline   Reply With Quote
Old 04-29-2008, 12:50 PM   #9
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

can't you just pull it and take a grinder to the flange?
m2cupcar is offline   Reply With Quote
Old 04-30-2008, 11:28 PM   #10
Newb
Thread Starter
 
Join Date: Apr 2008
Posts: 5
Total Cats: 0
Default

Yes - that would probably help, but I suspect that I'd have to take off more of the flange than I'd really want to.

I'm thinking now of trying to use pair of wedges on either side of the pipe to brace the upper section while prying on the lower section of the downpipe. I'm hoping that the wedges will limit the torque applied to the turbo flange and housing.
Red 92 Turbo is offline   Reply With Quote
Old 04-30-2008, 11:40 PM   #11
Former Vendor
 
Join Date: Dec 2007
Location: Texas Hill Country
Posts: 271
Total Cats: 16
Default

Try loosening up the fasteners holding the dnpipe to the turbo. Pull the pipe away from the interference and retighten.
Corky Bell is offline   Reply With Quote
Old 05-01-2008, 12:16 AM   #12
Newb
Thread Starter
 
Join Date: Apr 2008
Posts: 5
Total Cats: 0
Default

Corky - thanks for the suggestion. I will give that a try also.

Do you still have the jig for making the downpipe for the old FM/IHI kit?

Thanks!
Red 92 Turbo is offline   Reply With Quote
Old 05-01-2008, 11:32 AM   #13
Former Vendor
 
Join Date: Dec 2007
Location: Texas Hill Country
Posts: 271
Total Cats: 16
Default

Red, I think so. Will look as soon as I can remember it long enough to get from my desk to the old jig pile.
Corky Bell is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 57 07-19-2017 05:11 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
1996 Turbo Build Goldwar DIY Turbo Discussion 2 09-29-2015 10:20 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:24 PM.