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"If there's ever a nuclear holocaust, the only thing left will be cockroaches and Isuzu diesels." (author unknown) This site is dedicated to the humble little Isuzu P'up.
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PostPosted: Sat Aug 30, 2008 9:53 pm 
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Joined: Mon Feb 26, 2007 1:00 am
Posts: 56
Location: Portland, Oregon
So I finally got my exhaust done, original muffler was clogged up with soot pretty bad. when i got it out I could tap it on the ground and about a tablespoon of soot would dump out each time. So I got 2.5" from the down pipe right above the first turn into a 3" in and out flowmaster and 2.5 tail pipe. This is in my turbo trooper and wow what a difference. My original mileage stock was right at 25mpg per tank give or take a half a mpg, running b20. I added a secondary air inlet to the air cleaner and both inlets collect air right in front of the core support instead of the factory snorkel. K&N air filter, and now the exhaust. I'm up to a solid 27.5 mpg with two tanks so far and the power increase is amazing (almost all city driving). no flat spot before 2200 rpms anymore and it spins up VERY quick to 3200 rpm and redline. Noise wise its great a tiny bit louder than stock but just barely in the cab, hardly noticeable. Outside its a little throatier but not loud by any means. Before the old exhaust was a steady stream of hot air, now each pulse can be felt with your hand a foot back from the tailpipe at idle. Anyways it was pricey around 300 bucks including a new flex pipe but what a difference in drivability. this rig is beginning to have some get up and go, gets up to freeway speed quite nicely, strong passing power... oh the 4:10s helped out big time as well, lets the torque do what its supposed to. Down the road I see an electric fan, evans coolant, a n/a head i have with the bigger valves, maybe intercooler and a slight fuel adjustment... Oh to have more money and time.
Anyhow my 2 cents.
Hope to see some of you at the west coast meet


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PostPosted: Sat Aug 30, 2008 10:21 pm 
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Joined: Fri Apr 22, 2005 10:12 am
Posts: 351
Location: Lancaster, SC
sounds great! I did a ram air setup, k&n filter and a straight pipe prob 10 years ago and it was a great power increase, I cna only imagine how good it would feel on a turbo-d.

pup daddy

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1985 Pup diesel 4x4 4spd SB (daily truck)
1986 Pup diesel 4x2 turbo LB (Waiting for some love)
1990 chevrolet 454SS pickup
1983 Mercedes 300sd


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PostPosted: Sun Aug 31, 2008 7:45 am 
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Joined: Mon Dec 17, 2007 11:57 am
Posts: 155
Location: Hardy,AR
Pup daddy,what size pipe did you use on your n.a. engine? The muffler is shot on my 86,and the tail pipe is non-existent. So since I've got to replace all that,figgered I'd replace the whole exhaust with a larger diameter pipe. Also,did you utilize the flex section from the stock exhaust?.

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Kal
    82 Luv 4x4 diesel=parts truck
    86 Pup diesel automatic=new purchase,project


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PostPosted: Sat Sep 20, 2008 1:28 am 
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Joined: Mon Jan 22, 2007 3:24 pm
Posts: 113
Location: NC asheville
hey, could you post a pic of the air setup you did? i would like to go that route and im curious how yours looks. i did the straight pipe as well and it definitely helped on the power.

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86 Trooper, now with 4JB1TC!
89 Trooper, 2.223t swap


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PostPosted: Sun Oct 12, 2008 7:53 am 
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Joined: Fri Mar 07, 2008 10:30 am
Posts: 363
Location: S.E. Oklahoma
could you guys post some photos please

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1981 isuzu pup 4x4 project for now
1982 isuzu pup engine and tranny (pending)
1995 isuzu npr biodiesel
2001 dodge ram 4x4 biodiesel
1981 Isuzu pup 4x4 biodiesel daily driver more power than a turbo dont know why ?


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