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EJ2kota
DakotaEnthusiast
 
4/30/2006
11:29:58
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 Subject: Low End Loss, HELP!
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Message:
Mods are a live and learn situation. I have a 00' 3.9 4X4. I had a set of 93' dak exhaust manifolds ceramic coated($135) and new y- pipe fabricated and installed. The new down pipes are 2 1/4", to the 2.5 pipe. Along with a magnaflow muffler. Sounds throaty, love the sound, hate the off the line loss in power. Great improve ment when over 2000 rpm. How can I get my low end back? Or do I have to go back to stock down pipes? Will underdrive pulley help?
Thanks,
Ernie J.
Airaid cai,Hughes modified oem TB,180 stat,accel coil & 8mm wires, NGK 4291 plugs.
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daddio
Dodge Dakota
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4/30/2006
11:57:49
|  RE: Low End Loss, HELP!
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Message:
what gears and tires are you running? do you still have the cat in there?
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cuzindoug
GenIII
4/30/2006
12:02:38
| RE: Low End Loss, HELP!
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Message:
Yeah, and what is your TB bored at?
If it doesn't fit, you're using the wrong hammer!
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EJ2kota
DakotaEnthusiast
4/30/2006
12:55:30
| RE: Low End Loss, HELP!
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Message:
Running stock tires 235/75 R15 and gears. I think they are 3.55.Cat is original. Was removed,inspected and reinstalled with new O2 sensors. The TB is the Hughes stage 1 for the V6, 469 CFM at 1.5" Hg pressure drop. Forgot to mention it is an automatic transmission.
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daddio
Dodge Dakota
JOIN HERE
5/01/2006
08:49:32
| RE: Low End Loss, HELP!
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Message:
you may want to consider changing gears to 3.92:1 or 4.10:1.
i also wanted to know if your intake was modified in some way? posibly shorter runners? that would compound the problem on the low end.
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EJ2kota
DakotaEnthusiast
5/01/2006
14:44:14
| RE: Low End Loss, HELP!
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Message:
Intake manifold is stock. No mods there. I take it no chance getting it back without changing gears. How about one of those inserts from car chemistry?
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daddio
Dodge Dakota
JOIN HERE
5/01/2006
15:05:59
| RE: Low End Loss, HELP!
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Message:
well, you could try replacing your 2.5" exhaust with 2.25"? or try another TB.
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bludak
Dodge Dakota
JOIN HERE
5/01/2006
16:22:13
| RE: Low End Loss, HELP!
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Message:
Yup, TB could be too large for bottom end. Try a Fastman 46 mm. It works fantastic.
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J and J Auto
GenII
5/02/2006
04:49:27
| RE: Low End Loss, HELP!
IP: Logged
Message:
the hughes stage 1 is a 50mm to big this alone
will cause a low end loss
drop a set of 1.7 rockers in there it will help
and get a 48mm F&B or 46mm fastman the bores
in the intake are 48mm the step from the 50
causes low end flow probs
I see so many people do this you must improve
the intake side before freeing up the exhaust
or you will lose low end the right tb and 1.7's
than work with the exhaust
you have 2 things against you here now
Larry
J&J Auto
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screwuphead
Dodge Dakota
JOIN HERE
5/02/2006
11:04:19
| RE: Low End Loss, HELP!
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Message:
If he wanted to run with the 50mm TB what would he have to do to get the low end back?
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