How much power you think the 3.6L pentatstar is capable of? - Jeep Garage - Jeep Forum

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Old 03-02-2016, 12:46 PM
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How much power you think the 3.6L pentatstar is capable of?- 550Hp?

Just curious what you guys think the 3.6L pentastar engine is capable of making?

I've been running the Stage 1 RIPP Supercharger system now for like 7 months and LOVING it ....makes tons of power over stock.

I started with ~185HP to the wheels stock...and with my Stage 1 I was pushing ~330AWD HP to the wheels after some tuning(running 6-7 lbs boost)


I just upgraded to the stage 2 system and upgraded to the SRT fuel pump to accommodate the 400+ AWD HP range - Right now I'm still only running 8-9 LBS of boost but just ordered the small pulley to get my Boost to the 12-13 LB range

I have a date with the AWD dyno next weekend and expect to easily hit the 430-450HP AWD mark-..with a couple of hours of tuning-via help from a professional diablo tuner --anyone else seen what these 3.6L are capable of?

I had my shop run it on the dyno today and even running SUPER rich up top I got 403AWD Hp to the wheels ...with some extra boost these 450HP numbers should be realistic

Just curious if anyone has seen anyone pushing these things to the 450HP to the wheels- 550+HP at the engine mark?

Current setup:
RIPP Stage 2
Larger SRT Intercooler
K&N Conical filter
910CC Injectors
SRT Fuel Pump
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File Type: jpg stage 2.jpg (373.8 KB, 145 views)

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  #2  
Old 03-02-2016, 03:53 PM
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Re: How much power you think the 3.6L pentatstar is capable of?

Double the stock output of an engine not made for boost seems to be a common limit from my experience.
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Old 03-02-2016, 08:11 PM
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Re: How much power you think the 3.6L pentatstar is capable of?

I have nothing of value to add. Just wanted to note I'm drooling over the HP. Can't wait to hear what the output is on your next run at the dyno. Good luck,
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Old 03-03-2016, 05:19 PM
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Re: How much power you think the 3.6L pentatstar is capable of?

Any 1/4 mile ETs?
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Old 03-03-2016, 08:05 PM
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Re: How much power you think the 3.6L pentatstar is capable of?

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Originally Posted by Lightninrod View Post
Any 1/4 mile ETs?
Not yet
I'm not a drag racer and never get to the real track..but I do have a new gtech timer so I guess I could try using that to test the 0-60 and 1/4 mi times again

I only played around with the 0-60 one day ..a while ago

And with 330whp I was getting a 4.6sec 0-60

I suspect I should be low 4's now
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Old 03-03-2016, 10:09 PM
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Is that 845RE 8spd holding up under that stress? Are they recommending frequent trans fluid changes?
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Old 03-04-2016, 05:47 AM
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Re: How much power you think the 3.6L pentatstar is capable of?

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Originally Posted by silvermax04 View Post
Is that 845RE 8spd holding up under that stress? Are they recommending frequent trans fluid changes?
So far so good ..transmission is working perfectly..shifts super fast and no issues ..I haven't done any fluid changes or anything..currently I have 47k miles on my jeep with about 14k miles of that supercharged

I don't hammer it all the time from a dead stop either though as I'm trying to not completely kill the tranny

With the current 400hp to the wheels it's a complete beast though
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Old 03-04-2016, 10:34 AM
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Quote:
Originally Posted by ajag View Post

So far so good ..transmission is working perfectly..shifts super fast and no issues ..I haven't done any fluid changes or anything..currently I have 47k miles on my jeep with about 14k miles of that supercharged

I don't hammer it all the time from a dead stop either though as I'm trying to not completely kill the tranny

With the current 400hp to the wheels it's a complete beast though
At 450 hp to the wheels thats got to be way outside of the spec on the 845RE. If it blows maybe you can swap it for the 8HP70. Those are some nice numbers to the wheels though.
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Old 03-04-2016, 11:14 AM
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Re: How much power you think the 3.6L pentatstar is capable of?

I think most people here seem to be afraid of breaking the transmission at 400hp at the motor which is only like 280hp at the wheels

I've been running this for 7 months with 330whp so ~450hp at the motor and it hasn't been an issue yet

I'm not worried..if it breaks I'll just find something stronger

With this stage 2 I'm actually getting peaks of 10-11lbs of boost..I'm going to have this fully dyno tuned at this boost level before I crank up the boost to 14-15lbs

I still expect that I can get to 420-430whp at this boost level though
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Old 03-04-2016, 11:32 AM
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Quote:
Originally Posted by ajag View Post
I think most people here seem to be afraid of breaking the transmission at 400hp at the motor which is only like 280hp at the wheels

I've been running this for 7 months with 330whp so ~450hp at the motor and it hasn't been an issue yet

I'm not worried..if it breaks I'll just find something stronger

With this stage 2 I'm actually getting peaks of 10-11lbs of boost..I'm going to have this fully dyno tuned at this boost level before I crank up the boost to 14-15lbs

I still expect that I can get to 420-430whp at this boost level though
Sounds good glad its working well, so maybe the trans wont fail spectacurilly but maybe its just more of it will just shorten the life on it a good bit. Thats why i was curious on the fluid changes.

So just a general question why did you choose to boost the 3.6 instead of the 5.7? I get not wanting to move all the way up to SRT thats a big jump but a 5.7 would have only tacked on a little over 3k to the sticker. Is the 5.7 not as conducive to boost as the 3.6? Not throwing stones just wanting to understand.
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Old 03-04-2016, 01:55 PM
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Re: How much power you think the 3.6L pentatstar is capable of?

Quote:
Originally Posted by ajag View Post
I think most people here seem to be afraid of breaking the transmission at 400hp at the motor which is only like 280hp at the wheels

I've been running this for 7 months with 330whp so ~450hp at the motor and it hasn't been an issue yet

I'm not worried..if it breaks I'll just find something stronger

With this stage 2 I'm actually getting peaks of 10-11lbs of boost..I'm going to have this fully dyno tuned at this boost level before I crank up the boost to 14-15lbs

I still expect that I can get to 420-430whp at this boost level though
There's something wrong with your estimates of power. As for the exact specific wheel horsepower, it really depends on the dyno. My experience with Subaru dictates that no two dynos (even of the same type) read the same. A Dyno Dynamics and a Mustang dyno can give heartbreaks and "hand sizes" the size of Donald Trumps's. And we all know from last night that large palms means long...expectations.

But your 330 whp power is not the issue here. You probably have that number. What you don't have is 330/450 = 0.73 i.e. you do not have 27% powertrain loss. I have somewhere a graph by ZF about the efficiency (and losses) of their transmissions and if I recall, it is around 8%. Ten - fifteen % it doesn't matter. It is not 27%.
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Old 03-04-2016, 06:26 PM
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Quote:
Originally Posted by f1anatic View Post

There's something wrong with your estimates of power. As for the exact specific wheel horsepower, it really depends on the dyno. My experience with Subaru dictates that no two dynos (even of the same type) read the same. A Dyno Dynamics and a Mustang dyno can give heartbreaks and "hand sizes" the size of Donald Trumps's. And we all know from last night that large palms means long...expectations.

But your 330 whp power is not the issue here. You probably have that number. What you don't have is 330/450 = 0.73 i.e. you do not have 27% powertrain loss. I have somewhere a graph by ZF about the efficiency (and losses) of their transmissions and if I recall, it is around 8%. Ten - fifteen % it doesn't matter. It is not 27%.
I'm inclined to agree here on this one. 27% is very high. That would put it worse then the 42rle in the 4speed libbys and magnums. And that trans has about 23-25% losses on it
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