DennisG01
07-07-2008, 11:17
I don't have any hard numbers to offer a perfect comparison, yet. Eventually I'll do some more "TDP Pull-Off" type runs on the highway which will give even clearer results. But in the meantime, here's some very interesting results.
To keep things in perspective, my "stock 21:1" had a JK ECM with 4" exhaust. My "Schoolcraft 18:1" has the same ECM & exhuast, but also JK hi-pops. PLUS: 21:1 HAD EGT PROBE MOUNTED IN DOWNPIPE, THE NEW 18:1 HAS IT IN THE PASSENGER'S EXHAUST MANIFOLD, RIGHT BELOW THE TURBO. And, let's not forget all the tweaking and balancing Ron Schoolcrtaft did to my engine as he was building it.
Also, the 21:1 was a towing a 6,000lb boat, the 18:1 is now towing a 9,300lb boat. Yes, there are a lot of variables so it's not exactly an apples to apples comparison, but it sure seems as though this 18:1 was a GREAT idea!!!
Anyways, here's some numbers: With the 21:1 I would regularly see a max EGT of about 950 to 1000 (which is really not that bad - but remember it's post turbo). With the 18:1 (towing 3,300lbs more and pre-turbo EGT probe) I've seen the temp's max out at about 850 - 900. I THINK THAT'S PRETTY DARN IMPRESSIVE! I can't wait to get the intercooler hooked up and also get JK's newest programming!
To keep things in perspective, my "stock 21:1" had a JK ECM with 4" exhaust. My "Schoolcraft 18:1" has the same ECM & exhuast, but also JK hi-pops. PLUS: 21:1 HAD EGT PROBE MOUNTED IN DOWNPIPE, THE NEW 18:1 HAS IT IN THE PASSENGER'S EXHAUST MANIFOLD, RIGHT BELOW THE TURBO. And, let's not forget all the tweaking and balancing Ron Schoolcrtaft did to my engine as he was building it.
Also, the 21:1 was a towing a 6,000lb boat, the 18:1 is now towing a 9,300lb boat. Yes, there are a lot of variables so it's not exactly an apples to apples comparison, but it sure seems as though this 18:1 was a GREAT idea!!!
Anyways, here's some numbers: With the 21:1 I would regularly see a max EGT of about 950 to 1000 (which is really not that bad - but remember it's post turbo). With the 18:1 (towing 3,300lbs more and pre-turbo EGT probe) I've seen the temp's max out at about 850 - 900. I THINK THAT'S PRETTY DARN IMPRESSIVE! I can't wait to get the intercooler hooked up and also get JK's newest programming!