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when exhaust is capped motor overheats!!!!!!!!!!!!!

Old Nov 21, 2001 | 01:42 PM
  #1  
86IROCTHD's Avatar
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From: Dallas, Tx
Car: 88 Trans Am
Engine: lt1 intaked 355 makin 277 on 25 psi of fuel pressure and stock timing :)
Transmission: A4 stock... that moved a mobile dyno a foot shifting into 2nd :)
when exhaust is capped motor overheats!!!!!!!!!!!!!

i have headers and a PEICED together Y-PIPE and 2 3/4 exhaust... to a cutout... and a 80 series flow...... when i put the cap on tha exhaust it overheats.... whats the deal?

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305, TPI,compucam 2030 cam, air foil, 8.8 wires, accel super coil, dynomax headers, custom y-pipe, cut out, 80 series flowmaster, just installed my 3.08 posi disc brake setup...(3.42-3.73 on the way). and a stage 4 chip :0). hittin a sad 15.1 after the chip with 2.73 open diff....
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Old Nov 21, 2001 | 07:08 PM
  #2  
Tas's Avatar
Tas
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is it before the cat? is your cat cloged?

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-Tas
'89 Formula WS-6

305, TBI, 700R4, P.A.W. 14x3 open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips, Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248)
Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
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Old Nov 21, 2001 | 09:22 PM
  #3  
86IROCTHD's Avatar
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Joined: Aug 2001
Posts: 483
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From: Dallas, Tx
Car: 88 Trans Am
Engine: lt1 intaked 355 makin 277 on 25 psi of fuel pressure and stock timing :)
Transmission: A4 stock... that moved a mobile dyno a foot shifting into 2nd :)
no its after the cats was thinking it could have been back pressure

------------------
305, TPI,compucam 2030 cam, air foil, 8.8 wires, accel super coil, dynomax headers, custom y-pipe, cut out, 80 series flowmaster, just installed my 3.08 posi disc brake setup...(3.42-3.73 on the way). and a stage 4 chip :0). hittin a sad 15.1 after the chip with 2.73 open diff....
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Old Nov 22, 2001 | 01:50 AM
  #4  
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From: Oregon
Uhh, wierd man, I just had a Exhaust Cutout installed and I havent experienced any differences in cooling/ overheating with it capped or uncapped.

That is strange!

-Roshambo

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-Joe
1988 Pontiac Trans Am WS6 - 305 TPI, 700R4, 3.23 Posi, Digital Dash, Leather Seats, Maui Blue with Silver GFX, T-tops, Tinted Glass, Gutted MAF, TB Coolant Bypass, K&N Cone Filter, 3" Summit Exhaust Cut-Out, 3" exhaust from Y-pipe back, MSD Super Coil, Accel 8mm wires, L98 Aluminum Heads, Ported and Polished Plenum, Siamesed Intake, Aluminum Driveshaft, Edelbrock 3 point Strut Tower Brace
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