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bmw_686 05-10-2011 01:19 AM

has anyone dynoed there jeep?
just wondering if anyone has any numbers for a 5.7 or 4.7 wk

bmw_686 05-10-2011 06:32 PM

Re: has anyone dynoed there jeep?

MasterWK 05-10-2011 06:47 PM

Re: has anyone dynoed there jeep?
Yes, but not me personally. I've seen the charts for a 5.7 somewhere on here before...

bmw_686 05-10-2011 06:50 PM

Re: has anyone dynoed there jeep?
Oyah do u remember what numbers it was pushing

jeepgcoman 05-10-2011 07:15 PM

Re: has anyone dynoed there jeep?
Don't know about the Jeep, specifically, but many have dyno'ed the 5.7 Hemi's in the LX's. In stock form (2 wheel drive) they usually put out ~280-290 rwhp. I've seen slightly modified LX's (headers, intake, tuner, exhaust, etc.) put out as much as 320 rwhp. The stock LX exhaust (2.25 X 2) system (including manifolds) is quite a bit better than the WK. (2.5 X 1) See my thread on the comparison:

bmw_686 05-10-2011 07:43 PM

Re: has anyone dynoed there jeep?
Oyah what I really wont to know is how much the qd2 eats up because that's what matter

jeepgcoman 05-10-2011 09:17 PM

Re: has anyone dynoed there jeep?
I haven't found a loss %age for the Jeep, but I am still looking. I did find one for a chrysler 300 4X4 (didn't say which engine though), and it lost 37% from crank to wheels. That's way more than I would have thought. Another article said, "The average rear-wheel drive street car (with between 100-200HP) will lose about 17% of the engine’s fly-wheel HP through drive-train losses." And, continued, "A reasonable estimate for a four-wheel drive car will show a loss of approximately 20-25% of its fly-wheel horsepower before reaching the drive wheels (newer four-wheel drive systems will lose less HP because of a more advanced design)."

Since the QDII system is considered to be "a more advanced design", I'd probably estimate it on the high (25%) side. That's a bunch of loss, IMO. No wonder my Hemi LX is a full second faster than the Hemi WK in the 1/4 mile.

Jahkneefive 05-10-2011 09:26 PM

Re: has anyone dynoed there jeep?
In my awd Eclipse (10K on it) i lost about 25% vs. the claimed factory bhp, MTX tranny. On my 5.9, which had 60K on it I was 30% below factory bhp, ATX tranny. In my 92 Talon AWD the race motor was blueprinted and dynoed at 458bhp and on the dyno I pulled 352, which is what ~24% give or take, MTX tranny. Most of my Subby friends put it around 25-30% for awd depending on the tranny.

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