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Gonna pass on the whole thing. Nobody wants spares or to be bothered with what could be a LP.

Thanks for your help. Agree the 35 wouldn't be anything but an anchor I wasn't sure about the front.

First to admit I know very little about XJ's. Crawled up from the basement to ask this basic question. Been offered a pair of axles from a 99/2000 XJ for 50 bucks. While I have no use for them I am thinking they could be flipped pretty easy. The rear looks to be a 35 from the picture so...

I am being vague for a reason. Reasons that I consider private in nature. Be it for my customers or that of my competition. Despite what you may think of me on a personal nature the OP's numbers as presented are not factual. He is being as vague as I in presenting how the numbers were obtained...

You can call me any name you wish. Bottom line is the dyno printout may show you big numbers. What is missing is an accurate explanation of how those numbers were obtained. The overall TQ number and the HP/TQ spread simply doesn't make any sense. Add in the parasitic drag and the story becomes...

DynoJet chassis dyno to a CDS (Competition Data Systems) data logging system. One of the better comments in this thread.

I use a well respected orginazation that speiclizes in high performance. They use a name know brand dyno set to a 3300 lb load. The test starts at somewhere between 1800 and 2500 RPM with a 1:1 ratio. The test ends when power drops off, rev limit is reached or the owner of the test subject...

Nobody ever said they didn't know what they were doing. By your own admission they tested with various parameters. My only comments were that the end numbers didn't fit the model tested.

If they were NASA certified than we would know they were accurately obtained under industry guidelines.

Some of us are trying to be realistic.

One factor that has not been touched is how the dyno is set up. My testing is done with a 3300 lb. load roller. If the OP's dyno was set up to a lessor value that would explain the higher TQ numbers. The ratio may have been 1:1 but if the load is reduced the numbers would be skewed. Sorta like...

All of my builds are with a 7120 or an 0630 head. Late model intake and a BBK 62mm TB. Several different headers but all are relatively the same. In addition the engines are OBD2 with aftermarket tuning support. Not saying the numbers are wrong but I am really struggling to understand the...

Good numbers but I am curious on how you got them. What I mean is after reading and rereading the thread I cannot see where you show a pull in 1:1 gear ratio. Which typically is how engines are measured on a chassis dyno. Several others have bought this up and unless I am missing it the...

Did a bit of searching. Grounding the circuit bumps the RPM by approx. 250 RPM.

Perfect, suspect the fan combo you are using is in the 3.8 dual unit that will fit the YJ radiator nicely. Can use the ECM to trigger the relay. Have to decide if a single speed will suffice or wire it up for the dual low/high. Thanks

Screwed up and forgot to add this question to my fan temp thread. Again, Jensen can cal most any RPM into the extended idle feature I want. What is the factory extended idle RPM ? Thinking I might want about 1100-1200 for OBA but there might be no need for Chris to screw with that...

This is the logic I am thinking also. Don`t want to be running at 195 as the fan will never shut off during normal operation. Best numbers on the dyno are hot lapping at around 210. So I am not afraid of a little heat so long as the fan can take it down when requested.

Sent Chris Jensen a couple XJ ECM`s to recal for my Stroker YJ. Been running a mechanical fan but MIGHT convert to a Ford Contour electric. What are the XJ aux. fan temp set points that are cal-ed in the factory XJ ECM ? Thinking on at 205 and off at 195 ? Chris can cal anything I want. Thanks

Nice 2 hour conversation today. :patriot: