According to ZZ Performance front 3800 manifold is a restrictive part of the engines exhaust. In contrast the rear manifold has much larger individual runners. While many owners choose the $350 OG headers and the $300 ebay units for their 3800SC, they are not Fiero specific and you lose the trunk with them. Fiero specific headers are expensive ( and many times restrictive) but I have serious doubts that they give much more horsepower and torque than the stainless steel powerlogs. At $149.00 the powerlogs are reasonably priced.
If we look at the dyno test charts on the powerlogs (ref ZZ website) they provide an increase of over 10 ft lbs of torque and about 15 HP in the 4500 RPM up range. IMO this is excellent fror a $149 bolt on part. . The question is has anyone here done any dyno tests on the powerlogs and were they as favorable as what I've read. This was found in the archives.


Also see here: http://shop.zzperformance.c...nless-Power-Log.aspx

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 09-11-2012).]

Do the powerlogs bolt to the GTP stock crossover pipe? and does it dump to the same downpipe spot?

quote Originally posted by Purple86GT: Do the powerlogs bolt to the GTP stock crossover pipe? and does it dump to the same downpipe spot?

The stainless steel powerlogs bolt right up to the stock crossover pipe so the exhaust symmetry of the 3800 engine is not changed. It took me only about 40 minutes to install. Everyone that I have spoken with who run them says that a noticeable increase in torque, horsepower, and gas mileage resulted. The consensus is that they also help or eliminate KR's (depending on mods and application). I'll take 10HP more for $149.00. The primaries are 1 5/8" which is reportedly optimum for this setup. If you go to full headers ZZ Performance recommends and makes their headers with 1 3/4" primaries. While you might get a few more horses with 1 3/4" primary headers on a Price vs performance basis the powerlogs appear to be the best buy. I have yet to test or do some scans with my install but the initial impression that I have of them is very favorable.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

When I had my gp the plogs were a big hit on club gp a lot of people swore by them. Esp if you wanted easy way to reduce kr without breaking the bank. Ima +1 for them and will definitely be installing them on my 3800 build.

I was thinking about installing a P-log on my 3800 SC III Fiero. I want to increase the HP which is always good, but it will also dress up the engine too. I note that they have new crossover pipe with a ceramic coating on it too, but if you want the P-log for the rear cylinder it does not work with the stock exhaust setup. So I would need to make up a whole cross over and main exhaust mount to make that work for me. And by the time I bought both P-Logs and made up the new cross over and main exhaust mount it would be in the same range of pricing as doing complete headers. So I am in a quandry on this upgrade.

+ Plogs add Horsepower/Torque
+ Reduce Knock
+ Bolts right up. No modifications required.
+ Stainless Steel Design looks good (unfortunately it's hidden by the firewall in the Fiero)

- Have been known to crack

I think for what you pay for them $150 the're an awesome mod.

quote Originally posted by fieroall: + Plogs add Horsepower/Torque + Reduce Knock + Bolts right up. No modifications required. + Stainless Steel Design looks good (unfortunately it's hidden by the firewall in the Fiero) - Have been known to crack I think for what you pay for them $150 the're an awesome mod.

ZZ says that early designs did have design flaws but these were corrected when the design was revised and changed over to stainless steel.

I used one on my swap and it worked really well for what I wanted but, I can not compare it to anything else because that is the only exhaust I have used. The P log does look like it has a lot better flow than the stock manifold. I have comparison pics in my build thread that is in my signature.

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86GT, 3800SC, GETRAG, true duals, 3.4 pulley, comp VS cam, zzp match flow injectors, zzp power log, WCF air intake, ARP bolts, comp lifters and push rods, 90# springs, SI stainless valves, aero-force scantech meter.
Here is my build thread https://www.fiero.nl/forum/Forum2/HTML/122548.html

Got it on my GP.... I say skip it and go for headers.

quote Originally posted by BlownFiero86: I used one on my swap and it worked really well for what I wanted but, I can not compare it to anything else because that is the only exhaust I have used. The P log does look like it has a lot better flow than the stock manifold. I have comparison pics in my build thread that is in my signature.

Your setup looks sick! I like the rear manifold did u completly make that on your own or did you just modify the stock rear manifold?

been looking over the ZZP site. I am also looking to do the PLog for my SIII NA swap. every little bit helps with a NA motor.

Is it me or is the log in your first picture backwards, or is it a "one off". its looks like its on the trunk side of the engine????? Made for a Turbo maybe???

Rob

quote Originally posted by qwikgta: been looking over the ZZP site. I am also looking to do the PLog for my SIII NA swap. every little bit helps with a NA motor. Is it me or is the log in your first picture backwards, or is it a "one off". its looks like its on the trunk side of the engine????? Made for a Turbo maybe??? Rob

Rob: The powerlog shown in the picture that I pulled out of the archives is installed on the rear side when it should be installed in the front. The water passages to the supercharger in the pictures of the LIM clearly show the transmisson end. I can only guess that this a custom installation using two Powerlogs but according to ZZ Performance the rear OEM manifold flows very well and you don't need a P-Log there. The beauty of the powerlogs is that they fit the Fiero body or any 3800 platform and they take about 30-40 minutes to install . If you decide to use ZZ headers they do give you a step up to 1 3/4" primaries but they won't fit well on a Fiero swap. As a preventative against any possible cracking, I put a layer of powdered graphite on the gaskets so that the manifolds might be able to shift a bit when under severe heat stress.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

That's my engine in the picture. That rear manifold is a ZZP turbo power log, meant to be used as a part of a basic ZZP turbo kit. I plan on using it to send the exhaust to the front drivers side corner, just like on a 2.8 so that I can do stock routing with the exhaust. I have to add the EGR passage to the rear P log. I might shorten the front one to remove the bend so that I can do a neat "Y" merge from each manifold. That's what's going on in that picture.

quote Originally posted by Fierobsessed: That's my engine in the picture. That rear manifold is a ZZP turbo power log, meant to be used as a part of a basic ZZP turbo kit. I plan on using it to send the exhaust to the front drivers side corner, just like on a 2.8 so that I can do stock routing with the exhaust. I have to add the EGR passage to the rear P log. I might shorten the front one to remove the bend so that I can do a neat "Y" merge from each manifold. That's what's going on in that picture.

this is what I did for stock routing exhaust w/ 3800
https://www.fiero.nl/forum/Forum2/HTML/115264.html

I was going to use it but it was only 10hp way high in the RPM (seen in chart) where you rarely use it and if they crack later what a waste. I ported heavily the stock ones so maybe I got 5hp out of the 10. I say if you have $$ to throw out go for it.

quote Your setup looks sick! I like the rear manifold did u completly make that on your own or did you just modify the stock rear manifold?

I made it out of black iron. It is a bit heavy and may or may not be the best performance exhaust, but I wanted true duals and that was the best way that I seen to do it. It does make it sound very interesting. There are a few videos on youtube of it. The links are in my build thread. Thanks for the compliment, Ben

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86GT, 3800SC, GETRAG, true duals, 3.4 pulley, comp VS cam, zzp match flow injectors, zzp power log, WCF air intake, ARP bolts, comp lifters and push rods, 90# springs, SI stainless valves, aero-force scantech meter.
Here is my build thread https://www.fiero.nl/forum/Forum2/HTML/122548.html

Just use a mustang 3.8 mainfold..