Big Mikes 98 Dakota 2.5 Reg Cab 2wd Build Thread
#41
10-31-2013 | 11:09 AM
Thread Starter
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Professional
Joined: Sep 2013
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Bigboi407
Is this what you got or is this a better set of Pistons?
http://www.summitracing.com/parts/sl...view/make/jeep
Or one of these at Summit racing
http://www.summitracing.com/search/y...2.5l%20pistons
Is this what you got or is this a better set of Pistons?
http://www.summitracing.com/parts/sl...view/make/jeep
Or one of these at Summit racing
http://www.summitracing.com/search/y...2.5l%20pistons
http://www.summitracing.com/parts/slp-h802cp/overview/
#42
11-01-2013 | 05:06 PM
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From: Gilbert, Arizona
Bigboi407
If you are going to put a 4.0 tb on this thing don't forget to do these things before you install the manifold.
1. Use a file to widen the manifold opening as the 4.0 throttle body needs it as you can see by the gasket.
2. Look into the manifold for any sharp points and smooth them out like blueprinting the manifold.
3. Optional and doesn't help anything but gives you some peace of mind is flip the manifold over and braze that port shut so you never have a problem when that silly plug falls off. I say upside down so no brazing material falls into the manifold. Or better remove the brass port braze it then put it back on with some sealer so you have no air leaks.
If you are going to put a 4.0 tb on this thing don't forget to do these things before you install the manifold.
1. Use a file to widen the manifold opening as the 4.0 throttle body needs it as you can see by the gasket.
2. Look into the manifold for any sharp points and smooth them out like blueprinting the manifold.
3. Optional and doesn't help anything but gives you some peace of mind is flip the manifold over and braze that port shut so you never have a problem when that silly plug falls off. I say upside down so no brazing material falls into the manifold. Or better remove the brass port braze it then put it back on with some sealer so you have no air leaks.
Last edited by 98DAKAZ; 11-01-2013 at 05:10 PM.
#43
11-02-2013 | 02:58 AM
#44
11-02-2013 | 05:49 AM
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Joined: Jul 2011
Posts: 4,890
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From: Gilbert, Arizona
An 4.0 tb from 1998 to 2002 it must have a MAP sensor on it the older ones don't have the MAP and will not work.
The stock air hat fits like a glove same size
Like this one
The stock air hat fits like a glove same size
Like this one
http://www.ebay.com/itm/Jeep-TJ-98-01-Wrangler-THROTTLE-BODY-4-0-6-Cyl-/151154275888?pt=Motors_Car_Truck_Parts_Accessories&hash=item23317f3630&vxp=mtr
Last edited by 98DAKAZ; 11-02-2013 at 06:01 AM.
#46
11-08-2013 | 11:42 AM
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Joined: Feb 2011
Posts: 262
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From: California
Bigboi,
Sounds like an awesome build. Are you going to be upgrading the fuel system too? Bigger injectors and fuel pump?
As 98DAKAZ has said, the 4.0 tb is a great mod. While the motor is in the shop you should have them PnP the head and intake manifold. This improves engine response and revs quicker.
The roller rockers are great, easy install and well worth it, especially on the top end.
The banks header is nice, fits snug with the stock downpipe. If you want you could do a custom 2.5" downpipe. Sounds and feels great.
Hesco use to make a camshaft for these motors, the RVOB4. It's a good cam, but you can also get one custom grind for you application and needs. Call Crane or Comps, will be pricey though.
Also, along with all these fun toys are you going to use an SCT tuner or get it Dyno tuned?
Good luck with the build. These little motors can be torque monsters if built up.
Sounds like an awesome build. Are you going to be upgrading the fuel system too? Bigger injectors and fuel pump?
As 98DAKAZ has said, the 4.0 tb is a great mod. While the motor is in the shop you should have them PnP the head and intake manifold. This improves engine response and revs quicker.
The roller rockers are great, easy install and well worth it, especially on the top end.
The banks header is nice, fits snug with the stock downpipe. If you want you could do a custom 2.5" downpipe. Sounds and feels great.
Hesco use to make a camshaft for these motors, the RVOB4. It's a good cam, but you can also get one custom grind for you application and needs. Call Crane or Comps, will be pricey though.
Also, along with all these fun toys are you going to use an SCT tuner or get it Dyno tuned?
Good luck with the build. These little motors can be torque monsters if built up.
#48
11-08-2013 | 09:33 PM
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Joined: Jul 2011
Posts: 4,890
Likes: 32
From: Gilbert, Arizona
00daksport25 has done many of these changes to the 2.5 engine.
On the ignition I have done 3 things Accel 8 mm wires love them but you can get better the Accel Hot coil and Bosch Iridium fine wire plugs with a little wider gap I use .040
One note the coil needs a wire adaptor this sucks but is needed. $30... this sucks
I recommend a new Distributor Pickup Coil keep the old one as a spare.
A warning get a quality cap and rotor as the cheap ones are very bad look for long rotor pickups inside the cap.
rockauto part #
AIRTEX / WELLS Part # 5D1108A {#F994G} Premium these have the copper contacts excellent cap
On the ignition I have done 3 things Accel 8 mm wires love them but you can get better the Accel Hot coil and Bosch Iridium fine wire plugs with a little wider gap I use .040
One note the coil needs a wire adaptor this sucks but is needed. $30... this sucks
I recommend a new Distributor Pickup Coil keep the old one as a spare.
A warning get a quality cap and rotor as the cheap ones are very bad look for long rotor pickups inside the cap.
rockauto part #
AIRTEX / WELLS Part # 5D1108A {#F994G} Premium these have the copper contacts excellent cap
#49
11-15-2013 | 12:48 PM
Thread Starter
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Professional
Joined: Sep 2013
Posts: 138
Likes: 0
Bigboi,
Sounds like an awesome build. Are you going to be upgrading the fuel system too? Bigger injectors and fuel pump?
As 98DAKAZ has said, the 4.0 tb is a great mod. While the motor is in the shop you should have them PnP the head and intake manifold. This improves engine response and revs quicker.
The roller rockers are great, easy install and well worth it, especially on the top end.
The banks header is nice, fits snug with the stock downpipe. If you want you could do a custom 2.5" downpipe. Sounds and feels great.
Hesco use to make a camshaft for these motors, the RVOB4. It's a good cam, but you can also get one custom grind for you application and needs. Call Crane or Comps, will be pricey though.
Also, along with all these fun toys are you going to use an SCT tuner or get it Dyno tuned?
Good luck with the build. These little motors can be torque monsters if built up.
Sounds like an awesome build. Are you going to be upgrading the fuel system too? Bigger injectors and fuel pump?
As 98DAKAZ has said, the 4.0 tb is a great mod. While the motor is in the shop you should have them PnP the head and intake manifold. This improves engine response and revs quicker.
The roller rockers are great, easy install and well worth it, especially on the top end.
The banks header is nice, fits snug with the stock downpipe. If you want you could do a custom 2.5" downpipe. Sounds and feels great.
Hesco use to make a camshaft for these motors, the RVOB4. It's a good cam, but you can also get one custom grind for you application and needs. Call Crane or Comps, will be pricey though.
Also, along with all these fun toys are you going to use an SCT tuner or get it Dyno tuned?
Good luck with the build. These little motors can be torque monsters if built up.
My current Machine shop tab is $213, i dont know what a PnP would run me, Wouldnt a 3 angle valve job be better than PnP?
DAKAZ, do you have part numbers for the wires and adapter, possibly a recommended source?
Last edited by Bigboi407; 11-15-2013 at 02:26 PM.
#50
11-15-2013 | 07:42 PM
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Joined: Jul 2011
Posts: 4,890
Likes: 32
From: Gilbert, Arizona
Remember this is an improvement but you may not even notice it for the money they have the 8mm sparkplug wires also by accel great wires they are red only if I remember.
the wires $52 http://www.summitracing.com/parts/ac...e/model/dakota
Looks like this place has a good price on all the parts http://www.summitracing.com/
the wires $52 http://www.summitracing.com/parts/ac...e/model/dakota
Looks like this place has a good price on all the parts http://www.summitracing.com/
Last edited by 98DAKAZ; 11-15-2013 at 07:51 PM.