928 Specialists Afterburner 32 (and other) exhaust for the 86?
02-15-2002, 02:05 AM
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928 Specialists Afterburner 32 (and other) exhaust for the 86?
Will any one that has added the 928 Specialists Afterburner 32 (or other) exhaust from the cats back tell me about there experience with them. Was there a substantial performance increase? Was there a substantial increase in noise?
What resonater can I add to it?
Are there other exhaust options for the 86.5 given that I need to replace my intermediate mufflers?
TIA
Andy
What resonater can I add to it?
Are there other exhaust options for the 86.5 given that I need to replace my intermediate mufflers?
TIA
Andy
02-15-2002, 10:52 AM
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I've got the 16, which uses the same basic muffler and design (3" versus 3 1/2" piping for you)
Substantial increase in "noise" - yes. After the system goes through a week's worth of heat cycles, it does quiet down, but it is substantially louder than the factory. I personally like it - it's rather intimidating, especially at WOT. *note* I do not have the additional muffling of a cat.
My seat-of-the-pants judgement is that there was an increase in HP & probably slightly more of an increase in torque. Not earth-shattering, but noticable. Part of that may be attributable to the fact that my intermediate muffler had taken a hard hit and was quite deformed. I have not dyno tested it.
Installation was a snap once I broke off the old bolts
Substantial increase in "noise" - yes. After the system goes through a week's worth of heat cycles, it does quiet down, but it is substantially louder than the factory. I personally like it - it's rather intimidating, especially at WOT. *note* I do not have the additional muffling of a cat.
My seat-of-the-pants judgement is that there was an increase in HP & probably slightly more of an increase in torque. Not earth-shattering, but noticable. Part of that may be attributable to the fact that my intermediate muffler had taken a hard hit and was quite deformed. I have not dyno tested it.
Installation was a snap once I broke off the old bolts
02-17-2002, 01:56 PM
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John:
It's a single. The original purpose for the swap was because of the crushed intermediate muffler. Not only did performance pick up, but all the oil blow-by into the intake has ceased. Backpressure is not my friend; I think it was Dr. Bob who suggested that as a possible cause.
Oh, and as a fun side benefit - in the parking ramp at work there is an Infiniti with a waaaay too sensitive aftermarket alarm. With the Afterburner, it's fun to just blip the throttle as I go by...
No headers yet; that's soon. Which raises a question - looking at the MSDS, it looks like they have significantly longer collectors than the stock manifolds; does this require a modified "test pipe"?
It's a single. The original purpose for the swap was because of the crushed intermediate muffler. Not only did performance pick up, but all the oil blow-by into the intake has ceased. Backpressure is not my friend; I think it was Dr. Bob who suggested that as a possible cause.
Oh, and as a fun side benefit - in the parking ramp at work there is an Infiniti with a waaaay too sensitive aftermarket alarm. With the Afterburner, it's fun to just blip the throttle as I go by...
No headers yet; that's soon. Which raises a question - looking at the MSDS, it looks like they have significantly longer collectors than the stock manifolds; does this require a modified "test pipe"?
02-17-2002, 03:15 PM
#5
Jim,
Naughty boy.
I was limited to what was available -2 1/2" or 2 1/4 " went with 2 1/2"- .
I believe the Headers come in -your choice- long and shorty versions. I'm looking for info on the long set-up as I read somewhere that some fender/fenderwall/liner mods were necessary. If someone reads this they may post, failing that we could call the Big 3, or,just check out member info at the bottom of posts and replies. I'll probably use a combo of the last two.
I ended up putting my original system back on for three reasons: 1. She sounded like a hooker walks.
Business...all business... The locals I have been abusing aren't as sloppy when they hear Pattycakes rumble up to the lights or when they pull-up from behind-70mph in 2nd- on the freeway. I was flogging everyone up to the auto., LS-1's. With the pipe it became difficult to lull them into a thrashing.
2.That same sound was attracting attention from the guy's with guns and badges. Some of the mustang/camaro crowd stage right on the freeway access roads which front residential areas...
90+ mph on surface feeder streets is stupid and is resulting in an increased presence of the cops.
At times, its all three, State, County, and City doing race track patterns using unmarked spotters to vector them to the 'Hot spots'. Since I do racetrack patterns also it is inevitable that I get company, "just cruising officer" barely works with the stock pipe let alone a 2 1/2" pipe, no Cat, single 15" Flowmaster and Trapps.
3. Finally, after looking at the system I realized that I want the headers, duals, maybe 2 3/4" pipe, shorty 3" or 6" cats, the flat,thin, Flowmaster 15" or 18", and the 'stackable' Super Trapps. I want to try an 'offset X' cross over this time as well.
You shouldn't need a test pipe if you go with the 'stackable' Trapps. Even on a single pipe I was able to -very unscientifically- balance the scavenging pulses with the stack. No complaints from the O2 sensor so the computer was happy.
I do have an over rich mixture situation that got neither better or worse from the change and back to stock need to get to an analyzer for that I think. If by modified test pipe you mean shortening of pipe after collector or headers prior to collector ... I'm afraid so. But that's one of the reasons I am going to fairly free flowing duals. I do need to know if the X crossover 'SHOULD' be close to the headers for a quicker response for balanced scavenging of each
exhaust pulse or does it 'REALLY' matter? And of course the age old question of how bog should the pipe diameter get? At some point big ...gets to big. Very few of the S'tangs I look at run much larger than 2 1/4" we need to look at that!.
Later, thanks for the Info.
John S. & Pattycakes
Naughty boy.
I was limited to what was available -2 1/2" or 2 1/4 " went with 2 1/2"- .
I believe the Headers come in -your choice- long and shorty versions. I'm looking for info on the long set-up as I read somewhere that some fender/fenderwall/liner mods were necessary. If someone reads this they may post, failing that we could call the Big 3, or,just check out member info at the bottom of posts and replies. I'll probably use a combo of the last two.
I ended up putting my original system back on for three reasons: 1. She sounded like a hooker walks.
Business...all business... The locals I have been abusing aren't as sloppy when they hear Pattycakes rumble up to the lights or when they pull-up from behind-70mph in 2nd- on the freeway. I was flogging everyone up to the auto., LS-1's. With the pipe it became difficult to lull them into a thrashing.
2.That same sound was attracting attention from the guy's with guns and badges. Some of the mustang/camaro crowd stage right on the freeway access roads which front residential areas...
90+ mph on surface feeder streets is stupid and is resulting in an increased presence of the cops.
At times, its all three, State, County, and City doing race track patterns using unmarked spotters to vector them to the 'Hot spots'. Since I do racetrack patterns also it is inevitable that I get company, "just cruising officer" barely works with the stock pipe let alone a 2 1/2" pipe, no Cat, single 15" Flowmaster and Trapps.
3. Finally, after looking at the system I realized that I want the headers, duals, maybe 2 3/4" pipe, shorty 3" or 6" cats, the flat,thin, Flowmaster 15" or 18", and the 'stackable' Super Trapps. I want to try an 'offset X' cross over this time as well.
You shouldn't need a test pipe if you go with the 'stackable' Trapps. Even on a single pipe I was able to -very unscientifically- balance the scavenging pulses with the stack. No complaints from the O2 sensor so the computer was happy.
I do have an over rich mixture situation that got neither better or worse from the change and back to stock need to get to an analyzer for that I think. If by modified test pipe you mean shortening of pipe after collector or headers prior to collector ... I'm afraid so. But that's one of the reasons I am going to fairly free flowing duals. I do need to know if the X crossover 'SHOULD' be close to the headers for a quicker response for balanced scavenging of each
exhaust pulse or does it 'REALLY' matter? And of course the age old question of how bog should the pipe diameter get? At some point big ...gets to big. Very few of the S'tangs I look at run much larger than 2 1/4" we need to look at that!.
Later, thanks for the Info.
John S. & Pattycakes
02-18-2002, 02:57 AM
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Jim,
Tell me more about this quote from your post " but all the oil blow-by into the intake has ceased." I know nothing of this oily blow by subject other than recently when I dissassembled my intake I found it to be mysteriously oily inside. I did not know what to attribute this oily residue to. What is it?
FYI, I took my rear muffler off and found a SOTP increase in acceleration.
Andy <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
Tell me more about this quote from your post " but all the oil blow-by into the intake has ceased." I know nothing of this oily blow by subject other than recently when I dissassembled my intake I found it to be mysteriously oily inside. I did not know what to attribute this oily residue to. What is it?
FYI, I took my rear muffler off and found a SOTP increase in acceleration.
Andy <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
02-18-2002, 01:06 PM
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A while ago there was a post here from the always-lucid Dr. Bob, addressing a question about the oil that seems to appear in so many of our intakes.
One of his possible causes for this was crankcase compression due to a plugged exhaust. Causes oil to blow by and it winds up in the main intake throat and throughout the intake distribution plumbing. Wally P posted a good vacuum-gauge diagnosis for plugged exhaust a while ago; archived <a href="http://members.prestige.net/jpirtle/keepers/exhaust/plugged_exhaust.txt" target="_blank">here</a>.
After I put the new exhaust on, I took off the entire intake assembly and cleaned it all up (very nasty throughout), put in new gaskets & o-rings all round, and for 5K miles now I haven't had a drop of oil in the intake. (Note to those owning older sharks - the o-ring that seals the throttle body to the lower intake port gets very flat and leaks. Easy to miss.)
Naturally, there are other causes for the oil (Devek addresses the problems with the oil breather assembly <a href="http://www.devek.net/index.php?page=nfo_pro_per_engine&cat=2" target="_blank">here</a>) and, of course, shot rings, etc.
Worth tracking down - ingestion of oil isn't such a good idea
John: Thanks. That pretty much answers my questions. I agree with you about the business end of the exhaust - there is a slight note of "American V-8" at WOT that I can't decide if I like. I'd prefer more Ferrari than F-Body, so when I get some more $ together the experimentation will continue. FWIW, my former over-rich condition was all bad AFM doing the tango with a toasted O2 sensor.
Regarding the "how big is too big" question - obviously, we don't want to join the rice crowd with their coffee-cans, but I have always understood that our engines prefer very very low backpressure. True? If so, it's just a question of under-car space and the logical extremes of silliness. I would not want my exit pipe to be any damn larger; I actually preferred the two smaller pipes of the original.
One of his possible causes for this was crankcase compression due to a plugged exhaust. Causes oil to blow by and it winds up in the main intake throat and throughout the intake distribution plumbing. Wally P posted a good vacuum-gauge diagnosis for plugged exhaust a while ago; archived <a href="http://members.prestige.net/jpirtle/keepers/exhaust/plugged_exhaust.txt" target="_blank">here</a>.
After I put the new exhaust on, I took off the entire intake assembly and cleaned it all up (very nasty throughout), put in new gaskets & o-rings all round, and for 5K miles now I haven't had a drop of oil in the intake. (Note to those owning older sharks - the o-ring that seals the throttle body to the lower intake port gets very flat and leaks. Easy to miss.)
Naturally, there are other causes for the oil (Devek addresses the problems with the oil breather assembly <a href="http://www.devek.net/index.php?page=nfo_pro_per_engine&cat=2" target="_blank">here</a>) and, of course, shot rings, etc.
Worth tracking down - ingestion of oil isn't such a good idea
John: Thanks. That pretty much answers my questions. I agree with you about the business end of the exhaust - there is a slight note of "American V-8" at WOT that I can't decide if I like. I'd prefer more Ferrari than F-Body, so when I get some more $ together the experimentation will continue. FWIW, my former over-rich condition was all bad AFM doing the tango with a toasted O2 sensor.
Regarding the "how big is too big" question - obviously, we don't want to join the rice crowd with their coffee-cans, but I have always understood that our engines prefer very very low backpressure. True? If so, it's just a question of under-car space and the logical extremes of silliness. I would not want my exit pipe to be any damn larger; I actually preferred the two smaller pipes of the original.
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02-21-2002, 12:15 AM
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At the suggestion of 928 Specialists I ended up going w/ the RMB instead of the Afterburner.
I was able to patch a small leak in my intermediate muffler w/ some quick steel and continue to run them.
The RMB did make a difference. For the 1st time (while going straight) it barked the tires going into 2nd around 40 mph not even close to WOT.
Thanks for the oil blowby info Jim.
Andy
I was able to patch a small leak in my intermediate muffler w/ some quick steel and continue to run them.
The RMB did make a difference. For the 1st time (while going straight) it barked the tires going into 2nd around 40 mph not even close to WOT.
Thanks for the oil blowby info Jim.
Andy