Topic: OBD2 2.5 Turbo Thread

[Tr00b]

While all the YJ guys get to have all the fun and have fairly simple and effective methods of turbocharging, the 1997 up guys are SOL, mostly due to the non-existent aftermarket of tuning devices. IMO, the 2.5 OBD2 engine seems to be left out. This lack of direct "here ya go" support is what turned me away initially.

For most vehicles, turbo tuning with OBD2 is a blessing. There are more stock sensors that can be utilzed in the tuning to maximize performance and a universal port in which to tap into the ECU CAN.

Here are some advantages to having a pre 1997 YJ Jeep with OBD1.

-Return on the fuel line to block to increase fuel pressure under boost.

-Split Second piggyback tune

-Multiple builds to copy

-Multiple extremely knowledgeable people to help

-Known tuning maps to be had

The advantages of turboing 1997 and up Jeeps:

NONE, so far. There is no known simple cheap ignition and spark tuning module available with application specific support. This means that the entrepreneuring enthusiast needs to take their time and their money to develop these solutions.

Some possible solutions:

This build uses the VERY pricey Haltech standalone ECU. A quick search on google shows ANY Haltech units coming in well over $1000. I lost interest in the thread before I found out what unit he used specifically.

http://www.jeepforum.com/forum/f9/another-tj-turbo-project-1248161/index10.html

My experience in the turbo Ford world is there were multiple good sources of plug an play OBD2 flash tuners, my "tuner of choice" being the SCT. I never pulled the trigger on one or a turbo build but about $400 was all it took to purchase one and they were readily tuneable and many of the enthusiasts already had maps that they could ballpark to your application. Sounds a BUNCH easier than a standalone ECU, because it is. Plug it in, done.

There is also the AEM FI/C.

http://www.aemelectronics.com/engine-management-systems-9/fuel-ignition-controller-f-ic-12/

Haven't found a running OBD2 jeep turbo build with one yet, still looking. It looks like the cost effective solution.

Then, there is the TOTAL hackjob route. Utilize a T18 transmission and transfer case, an 8.8 rear axle (with Ranger speed sensor for speedo) and make a TJ version of this rig, with a Ford Ranger wiring harness and cluster. Bonus: 3-400hp instead of 150. I would probably not do this to MY TJ but someone else might.

http://www.youtube.com/watch?v=Ai9rSHA6SC8&feature=g-user

[aparke4]

have you checked out 505 performance or hesco?

[Tr00b]

Hesco no longer seems to make turbo kits, it was one of the first places I looked. I talked to a guy who had an 4.0 turbo kit maybe a decade ago, and it included everything to make it work  (bolt on) and it was very effective, but it was for a pre-OBD2 Jeep.. I looked over the whole website and didn't find even the 4.0 version turbo kit, I did find supercharger stuff though.

505 makes a kit for the pre-OBD2 jeeps using the Split Second module, fuel regulator plugs, and some other stuff. Pretty cool, but not OBD2 2.5 compatible.

[mikepotts]

im new to this jeep 2.5 stuff, but you should add megasquirt to your list above, i have the MS2 v3.57 PnP system on my supercharged mustang and it works well.  their earlier DIY systems are compatable with everything.

[Tr00b]

I won't diss anyone running Megasquirt.

But...

Your car is an older OBD1, most Megasquirt apps I've seen were installed specifically to overcome the tuning drawbacks of the OBD1 systems. They are also massively complex and require alot of time to build and to master. Yes, forum support and etc is available, and it would work. But investing THAT much work into a vehicle that will see minimal gains is not ideal. I think preassembled versions are available, but honestly I bumbled around the website for awhile and got bored.

If I get excited about the project again, I'll email some companies and get some better answers about what will work.