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Post by Bruce on Jul 1, 2006 8:57:49 GMT 11
Well the new exhaust systems are now on both trucks. ;D First thing I noticed was how smooth they both were and the Wizard (auto) changed gears a lot smoother. Definitely more grunt but mainly in the higher rev range 2500 and above, but still pulled away good from 1500. Will keep you all posted on economy etc.
Cheers Bruce
PS when I take off it sounds like Iam in a Mack truck love it. ;D
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Post by Bruce on Jul 1, 2006 20:27:45 GMT 11
Just refueled the MU and have calculated a 9% better fuel economy ;D and Ive been using the right foot a bit heavier.  Ok next to fill the Wizard, Annies rig and mostly she get about one k less per litre than I do no matter which trucks she is driving,  see what it has done. Cheers Bruce. |
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Post by Jimmu on Jul 17, 2006 20:39:58 GMT 11
Good to hear of the improvement.
I have not noticed economy increase but it definately revs more cleanly to redline. I find It pulls through the gears that much quicker and so much more smoothly that I am changing gears 500 rpm higher than I used too.
Cannot wait for the boost up and fuel up next week!
Jimmy
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Post by astro49 on Jul 20, 2006 18:27:18 GMT 11
My exhaust upgrade project has to wait because a local dismantler just sold me an LSD diff and this messed up my cash flow (though I feel its more of a priority buy since its hard to find JDM surplus LSDs in our country). Anyways, am very excited having that 3" exhaust pipe upgrade from what results I'm reading from you guys.
Jimmy.. pulling through the gears quicker and smoother means your running an automatic tranny right?? I got A/T too.
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Post by Bruce on Jul 20, 2006 20:41:39 GMT 11
Hi Astro, Jimmy has a 2.8 manual. I have a 3.1 MU manual and a 3.1 auto Wizard, both have 3 inch systems, and to your question they both run a lot smoother, and more power ;Dand have sound pretty nice . Fuel economy seem to be better as well. Cheers Bruce. |
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Post by astro49 on Jul 20, 2006 23:20:26 GMT 11
Hi Bruce! Thanks for the info.
And please STOP mentioning all the good things about the 3" upgrade!!! I can't take it anymore hahaha!!! More than likely my MU will be on auto-pilot mode to the muffler shop this weekend ;D
Cheers,
Ying
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Post by astro49 on Aug 5, 2006 10:51:17 GMT 11
Just had my much awaited but delayed 3" pipe upgrade. Noticeable improvement is turbo now spools a bit higher now, from 12-13 up to a consistent 14psi. And when decellerating, there is now a whining sound which seems to eminate from the turbo but is heard from the exhaust tip.
And hmm Yeah, the sound of power too due to a straight through 3" Fujitsubo oval muffler I got used from a Japan surplus yard. The tone is low pitched more like a 6cylinder now but imho, this sound fits better if my tranny was a manual.
Engine responsiveness hmm.. there "seems" to be a bit improvement though I havent actually drove much yet to really tell since the MU got out of the muffler shop evening already and the drive home was through heavy traffic. I'll give more impressions later today.
Maybe I'd feel more improvement if my tranny was a manual coz right now, I still have some shifting problems (though minor) with my auto transmission.
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Post by daniel on Aug 6, 2006 22:31:23 GMT 11
Hi,
Did you guys get the exhaust from the turbo back, or from the first join?
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Post by Jimmu on Aug 7, 2006 8:49:48 GMT 11
Both Bruce and I have it from the turbo back including the dump pipe.
I had the system from the dump pipe back and just did the dump pipe.
The dump pipe makes as much of a performance difference as the rest of the system made without it.
Get the dump pipe!
Jimmy
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Post by daniel on Aug 9, 2006 17:31:13 GMT 11
I've decided to get the dump pie  How much would you expect to pay for one here in Sydney. The guy at A1 Exhaust quoted $295 from the turbo to my existing 2.5in pipe. Daniel |
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Post by Bruce on Aug 9, 2006 21:38:26 GMT 11
That sound pretty good, my whole system cost $720 in brisbane.
Cheers bruce.
PS witchdoctor paid around $300 for his dump pipe.
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Post by Graham on Aug 10, 2006 21:43:58 GMT 11
Daniel,
I got a quote of about 400 or so for the complete exhaust, 2.5" pipe from the turbo.
It's a little guy in Castle Hill. From memory he's near the Gloria Jeans office, just off Victoria Ave.
If it's local enough for you, I've got the business card somewhere and can find it if you want the name and address. email me.
Cheers, Graham.
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Post by Jimmu on Aug 11, 2006 10:27:07 GMT 11
When most shops say 'from the turbo back' they mean from the dump pipe back.
It is a bit of work fabricating a dump pipe which is why they cost around the $300 mark by themselves.
Jimmy
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Post by daniel on Aug 11, 2006 13:42:25 GMT 11
Well, as it turns out the quote that Graham got is at the same place as where i'm going. It's just under a different name now.
His quote was $480 for the whole thing. I got my exhaust from the dump back for $190 + the exhauhst tip. So, $190 + $295 that i've been quoted for the dump pipe = $485. Sounds right to me.
Daniel
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Post by dasnoboarder on Aug 11, 2006 14:56:32 GMT 11
I know it's a sad question to ask... but what is a dump pipe? Is it the piping that goes from the turbo exhaust outlet and joins to the rest of the exhaust system? If it makes that makes that much difference I'll have to get one of them too... |
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Post by Jimmu on Aug 11, 2006 15:25:42 GMT 11
You got it.
It is that small piece out from the turbo.
On the 2.8 at least it is quite restrictive.
Jimmy
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Post by astro49 on Aug 11, 2006 18:50:20 GMT 11
To continue my evaluation of the newly installed 3" pipe (all the way to the tip starting after the dump pipe):
1. Improved low to mid end torque. This is noticeable on uphills. I now seldom downshift to from D to 2 (automatic transmission).
2. Degraded top end. With the stock pipe and muffler, I could go gradually speed up to 140 kph. Now with the 3", from 120 to 140 kph takes quite a long time.
Note: I've already increased turbo boost and mixture even while using the stock exhaust pipes and muffler. These settings were untouched after the 3" pipe install.
3. No noticeable improvement in fuel economy though I would say there even was a slight increase in consumption. This is driving on 60% unpaved mountain roads and 40% paved
I think a 2.5" would be the best and the 3" an overkill (for a low reving 2.8 diesel). What I plan now is to cut the end of the tip a approximately 12" and have a 2 1/2 in. pipe as the tip to restrict the exhaust a bit. This might solve the top end problem.
Just a personal experience and my 2 cents......
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Post by dasnoboarder on Aug 11, 2006 19:09:46 GMT 11
Would it be a fair assumption to say a 2.5" would be the best upgrade for an otherwise stock 2.8L, and 3" if you're going to add an intercooler and up the boost & fuel etc?
Andy
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Post by astro49 on Aug 11, 2006 19:57:04 GMT 11
In my opinion (and personal experience) with the 3" on a 4JB1-T, I'd still go for a 2 1/2". Most of my hot rodding friends and even the muffler shop sez the 3" is overkill. Even if you plan to install an intercooler, up the boost and fuel plus advancing the injection pump timing. I've done these mods even before the 3" install and imho they had given more hp and noticeable improvement than the 3" alone.
Btw, I'm sure an important factor and issue to our reviews on this topic is likewise what muffler is used. Mine is a 3" straight through oval pipe made by Fujitsubo. This came from a Nissan Skyline. Maybe its not ideal for a 4JB1 and a counter flowed restricted silent muffler would have solved that top end power band down curve.
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Post by Bruce on Aug 11, 2006 20:28:06 GMT 11
A comparison between my 3.1 with 3 inch mandrel bent system and a 3.1 with a 2.5 inch pressed system are like cheese and chalk, both vehicles running 12 lbs boost.
Bruce
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see what it has done.
