http://www.turbododge.com/forums/ Topics about the exhaust system discussed here. en Sat, 21 Nov 2009 00:04:47 GMT vBulletin 60 http://www.turbododge.com/forums/images_td/misc/rss.jpg http://www.turbododge.com/forums/ http://www.turbododge.com/forums/f4/f16/318091-running-rich.html Thu, 19 Nov 2009 05:48:14 GMT not sure if this is right spot to ask this so I will and maybe someone can point me to the right spot. I found a daytona for sale with turbo and the owner said it runs fine but he noticed that it seems to be running rich since he put a 3inch exhaust on it. So I am wondering if that is to big and... not sure if this is right spot to ask this so I will and maybe someone can point me to the right spot. I found a daytona for sale with turbo and the owner said it runs fine but he noticed that it seems to be running rich since he put a 3inch exhaust on it. So I am wondering if that is to big and not letting enough back presure build, he also said the turbo is boosting higher according to the boost gauge?? any ideas or thoughts?? ]]> Engine - Exhaust carrot gupper http://www.turbododge.com/forums/f4/f16/318091-running-rich.html http://www.turbododge.com/forums/f4/f16/318075-when-removing-exhaust-manifold-sequence.html Thu, 19 Nov 2009 02:22:17 GMT the fella i had bought my turbo 2.2 head with manifolds still bolted onto it, told me that there is a sequence to unbolting the exhaust manifold from the head, is this true...possibly keeping it from warping? im trying to understand why he told me this. the fella i had bought my turbo 2.2 head with manifolds still bolted onto it, told me that there is a sequence to unbolting the exhaust manifold from the head, is this true...possibly keeping it from warping? im trying to understand why he told me this. ]]> Engine - Exhaust mmmkaycar http://www.turbododge.com/forums/f4/f16/318075-when-removing-exhaust-manifold-sequence.html http://www.turbododge.com/forums/f4/f16/317651-calculate-flow-losses-2-vs-2-a.html Fri, 13 Nov 2009 19:26:02 GMT a frequent question is 'what size exhaust pipe should I run?'

besides bling, there *is* a performance impact, since the larger exhaust pipe has lower flow velocity, and therefore lower friction flow losses.

but how to quantify ? fluid mechanics, argh...
there will be 'major losses' (due to the length of ducting)
and 'minor losses' (due to elbows and connectors)

for major losses, see, e.g. :
D'Arcy-Weisbach Equation for Pressure and Head Loss

assumptions:
2.2L, 6250 rpm, 14.0 psi, 85% VE
flowrate = 2.2 * 6250/2 * (1+ 14.0/14.7) * 85% = 11409 Lpm = .19 m^3/s
(this is a relatively crude method of calculating flowrate; anyone got a better idea?)

the tough part is to find the friction coefficient (f) ;
assuming a dynamic viscosity of 1.79E-5 N sec/m^2
and a duct roughness of 0.02mm (pretty smooth), 6m length, 200C air; from the moody diagram:
for a 2" pipe: Re = 356910, and roughness ratio .0004, f = ~0.018
for a 2.5" pipe: Re = 285528, and roughness ratio .0003, f = ~0.018
for a 3" pipe: Re = 237940, and roughness ratio .0002, f = ~0.019

for minor losses, see e.g. :
Minor Loss in Pipe or Duct Components
Assume a well constructed exhaust with 3 90s, 3 45s, couple connectors,
for a TOTAL minor loss coefficient of 2.0.

major loss + minor loss = total loss

for a 2" pipe, flow velocity = 126 m/s: 4181 + 11799 = 15979 Pa = ~2.3 psi
for a 2.5" pipe, flow velocity = 80.5 m/s: 1370 + 4833 = 6203 Pa = ~0.9 psi
for a 3" pipe: flow velocity = 55.9 m/s: 581 + 2331 = 2912 Pa = ~0.4 psi

I would appreciate if someone wanted to doublecheck my Excel spreadsheet, or if anyone wants a copy to play with PM me.

I will post a similar thread in the Induction section, comparing IC plumbing losses. ]]> Engine - Exhaust detobias http://www.turbododge.com/forums/f4/f16/317651-calculate-flow-losses-2-vs-2-a.html http://www.turbododge.com/forums/f4/f16/317282-help-me-choose-exhaust-2-5-a.html Mon, 09 Nov 2009 06:24:04 GMT Boys and girls, help me pick the right exhaust system...

I have an 87 GLHS, w/stock turbo and exhaust.

It's time to upgrade the exhaust (first) I am told because I plan to soon go to a Stage 5 FWDPerformance calibration(18psi) w/ +40s and a 3bar MAP.

The engine is a common block 2.2 with cast pistons (and not hyper/cast)

I believe that I will spring for the ported exhaust manifold as well, they are not too expensive.

*Should I go for 2.5" or 3" or will it not make that much difference at only 18lbs of boost? There is about a $100+ premium for the 3" option.

*Is the OEM swing valve adequate and if I move up to the later 2.5" SV do I need anything else...like a different wastegate can? Or do I have to upgrade the swing valve regardless?

* How is the fit of a 3" on an l-body? ]]> Engine - Exhaust ILIKESHELBYS http://www.turbododge.com/forums/f4/f16/317282-help-me-choose-exhaust-2-5-a.html http://www.turbododge.com/forums/f4/f16/317123-van-fire-wall-clearance.html Sat, 07 Nov 2009 03:21:53 GMT I am deployed right now and cant look at the van but i just have a ported stock manifold with a t3 flang. will this fit? i know i need a new turbo. i have a extra waste gate chilling at the house. EAGLE TALON STYLE T3 TO T3 WASTEGATE TURBO ADAPTOR:eBay Motors (item 170381074332 end time... I am deployed right now and cant look at the van but i just have a ported stock manifold with a t3 flang. will this fit? i know i need a new turbo. i have a extra waste gate chilling at the house.

EAGLE TALON STYLE T3 TO T3 WASTEGATE TURBO ADAPTOR:eBay Motors (item 170381074332 end time Nov-07-09 20:49:54 PST) ]]> Engine - Exhaust TurboZ28 http://www.turbododge.com/forums/f4/f16/317123-van-fire-wall-clearance.html