|
|
|||||||
| Buick Turbo Tech General technical support for the 86-87 Buick turbo cars |
 |
|
|
Thread Tools | Display Modes |
|
|
|
#1
03-09-2008, 12:34 AM
|
||||
|
||||
Comparison of downpipes
At the last open house we were able to compare Cottons
external waste gated downpipe with on of the Chinese knock offs commonly found on ebay. Here is a pic so you can see for your self.
__________________
Rob -------------------- 87 GN BGN00367D 87 Mazda B3800P/U*deceased 84 Pontiac GP 4.1 litre 96 Chevy S-10 (new project) Independent Amsoil Dealer ihadav8.com Turbo Buicks.net 
|
|
#2
03-10-2008, 03:53 PM
|
||||
|
||||
|
Quote:
As we saw, the DP on the right with the small discharge hole would not be able to control boost. I have customers that bought that DP and complained they could not get the boost below 25lbs, the hole needs to be enlarged. To be able to control boost we have to be able to divert exhaust away from the turbine wheel, if the discharge hole is too small, we will not be able to divert enough exhaust. What bothers me is the thickness of the exhaust flange, it is plain too thick. I'm not sure how far out the flange could be ported and I am also worried the flange opening for the DP may not be able to be ported out to flow properly when using a larger Q or S trim turbine wheel. I give the pipe an A for appearance, it is prettier than mine with the polished pipe... but thats about it.... 
__________________
Jack Cotton Cottons Performance 413-789-0531
|
|
#3
03-14-2008, 05:29 AM
|
|||
|
|||
 Bryan
__________________
Bryan 87 GN with 43k Stock block Champion GN1 14 bolt, ARP bolts, Cottons valve covers, Comp Cams 218/212 hyd roller, Scorpion rockers, Comp Cams double roller, home ported intake, Champion 1" plenum spacer, RJC PowerPlate, Turbonetics GT-K 850 BB, 3" DP with external wastegate, Cottons 4" cold air kit, Cottons FMIC, 72# inj, FAST XFI, ALKYCONTROL, Hooker cat back, Art Carr 9" NLU, Art Carr internals,Precision turbo saver, Metco adjustable uppers, Metco lowers, HR sway bar, MT DRs
|
|
#4
05-25-2008, 01:44 AM
|
||||
|
||||
|
Cotton's Custom 3.5 external gated down pipe.
The body was off the frame of our car in my shop here in indiana, the engine block at the machine shop, my headers and cross over pipe in Jacks hands.
I told Jack I was eliminating the A.C. out of the car, Jack did not tell Brian. (Brian I swear I told him). Brian welded up a Fricking awesome down pipe. He cut the cross over pipe of my Kenne Bell headers apart and rerouted it and welded it back togethor. I always hated how that thing use to fit. He made the custom 3.5 down pipe fit great around the headers, then he welded in the EGT bungs onto the headers. One of the photos below was taken before I installed the trans. I would bet a months pay that this thing would clear A.C. if I had it.
|
|
#5
05-25-2008, 01:47 AM
|
||||
|
||||
|
Here is another photo of it in the car. Remember Cotton's did not have the car when they made this down pipe. Not to bad hey?
|
|
#6
05-26-2008, 01:14 PM
|
||||
|
||||
|
The kid does awsome work!
__________________
'86 Gn with an RPE bullet. Almost everything else is from Cottons. 100% street car!
|
|
#7
05-26-2008, 02:29 PM
|
||||
|
||||
|
Quote:
|
|
| Bookmarks |
|
|
Hybrid Mode
