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True dual exhaust....? Anyone try this? by IcantDo55
Started on: 08-06-2003 12:56 PM
Replies: 6
Last post by: donk316 on 08-07-2003 12:26 AM
IcantDo55
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Report this Post08-06-2003 12:56 PM Click Here to See the Profile for IcantDo55Click Here to visit IcantDo55's HomePageClick Here to Email IcantDo55Send a Private Message to IcantDo55Direct Link to This Post
I'm thinknig of making a true dual exhaust for my 85 v6. I'd turn the rear facing exhaust manifold down and out the back drivers side and the front facing manifold would go around the bottom of the motor not unlike it does now and head out the passinger side rear. Anyone done this? I'd use a supertrap or some kind of muffler that goes on the tailpipe. I'm not concerned with cats because its an off road race car. Any imput would be great!
Mike
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jeffndebrus
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Report this Post08-06-2003 01:07 PM Click Here to See the Profile for jeffndebrusSend a Private Message to jeffndebrusDirect Link to This Post
Paul Taylor, England.
85 GT Notchback, 2.8 V6, 4 speed manual. Custom made Tubular branch exhaust manifolds with true twin 3in exhaust system. No CAT, No EGR. No Crossover pipe. ADS Road Race SuperChip & 160 deg stat. Poly bushes all round. Lowered 2 inches. 16" alloys with 225/45 rubber. 0-60mph in 5.5 sec.
www.fieroforum.co.uk/Paul85gt.htm
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ED's85GT
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Report this Post08-06-2003 04:27 PM Click Here to See the Profile for ED's85GTClick Here to Email ED's85GTSend a Private Message to ED's85GTDirect Link to This Post
When i was thinking about how i wanted the exhaust on my 4.9 I remembered and old Hot Rod article that said that a good exhaust for a "V" motor would be around 2" per side
(for a 300 cubic inch motor) with equal lenght pipes up to the crossover(for better exhaust scavenging). The article also mentioned that the crossover's placement is very critical (too far from manifolds= no good, Too close to manifolds= no good).

Armed with all of this information, i towed my Fiero down to the exhaust shop and told the guys what i wanted done. After looking at the Fiero for a while they explained to me that what i wanted would be very hard to do (expensive).

The more i look at both of my fieros the more i think that it would be almost impossible (very expensive) to build a true and at the same time functional(performance enhancing) dual exhaust set-up in these cars.

Just my oppinnion.

Ed

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ManiMack
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Report this Post08-06-2003 05:08 PM Click Here to See the Profile for ManiMackClick Here to Email ManiMackSend a Private Message to ManiMackDirect Link to This Post
 
quote
Originally posted by jeffndebrus:

Paul Taylor, England.
85 GT Notchback, 2.8 V6, 4 speed manual. Custom made Tubular branch exhaust manifolds with true twin 3in exhaust system. No CAT, No EGR. No Crossover pipe. ADS Road Race SuperChip & 160 deg stat. Poly bushes all round. Lowered 2 inches. 16" alloys with 225/45 rubber. 0-60mph in 5.5 sec.
www.fieroforum.co.uk/Paul85gt.htm

Thats pretty sick!

Just those mods will get a well running, stick, V6 fiero to 60 in 5.5 secs?
If so, the stock fiero system must suck..

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donk316
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Report this Post08-06-2003 08:01 PM Click Here to See the Profile for donk316Click Here to Email donk316Send a Private Message to donk316Direct Link to This Post
According to Clifford Performance the 4 / 6 cylinder specialists 2" exhaust is mint for 2.8 - 3.4L 'stage 2' tuning. Any larger and your wasting precious torque unless your running some twin turbo setup that requires dual 3" exhaust.
I have WCF shorty headers running into 2" mandrel tubing. The firewall side comes up and over the transmission and dumps out the drivers side exit under the facia. The rear header exits and does a 135 degree turn and dumps out the pass side. total cost to do this was 500 CDN, not including the mufflers. both pipes end in supertrapps. if you have any questions, let me know.

------------------
Email: adriantalliss@email.com
1984 Indy Fiero 4spd 3.4L
-Est 220hp @ 5000rpm / 230 tq @4500rpm, centerforce II clutch, 390cfm 4bbl holley, crane h272 cam, Edelbrock Torker II intake, 9 to 1 comp, minor head porting,headers, true 2" mandrel dual Supertrapp exhaust, factory 4.10 4 spd, 17x7 white Konig Ziege FR 205/40R17 RR 235/45R17. All interior leather changed to white, custom built adj aluminum rear wing, aftermarket gauges, corvette MBC upgrade, Held coilover kit, 2 inch drop front and back.

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IcantDo55
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Report this Post08-07-2003 12:13 AM Click Here to See the Profile for IcantDo55Click Here to visit IcantDo55's HomePageClick Here to Email IcantDo55Send a Private Message to IcantDo55Direct Link to This Post
 
quote
Originally posted by donk316:

According to Clifford Performance the 4 / 6 cylinder specialists 2" exhaust is mint for 2.8 - 3.4L 'stage 2' tuning. Any larger and your wasting precious torque unless your running some twin turbo setup that requires dual 3" exhaust.
I have WCF shorty headers running into 2" mandrel tubing. The firewall side comes up and over the transmission and dumps out the drivers side exit under the facia. The rear header exits and does a 135 degree turn and dumps out the pass side. total cost to do this was 500 CDN, not including the mufflers. both pipes end in supertrapps. if you have any questions, let me know.

Questions...Yes. Got a Pic? How does it sound? I have a stroked 2.8-3.4.

[This message has been edited by IcantDo55 (edited 08-07-2003).]

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donk316
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Report this Post08-07-2003 12:26 AM Click Here to See the Profile for donk316Click Here to Email donk316Send a Private Message to donk316Direct Link to This Post
Heres the only two pics I have handy:

Sounds good. lol. umm low burbly like a healthy v8 minus 2 cyl

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