2014 Jeep SRT 270 cam dyno results - Page 2 - Cherokee SRT8 Forum
WK2 SRT8 Tuning/CMR/Dyno/DataLogging/Gauges This section is for all WK2 SRT8 specific discussions related to hand held tuners, CMR tuning, Dyno tuning, Data Logging & Gauges.

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post #11 of 22 (permalink) Old 04-07-2019, 06:01 AM Thread Starter
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I could be wrong but that looks a little low, can you post the dyno sheet?


Mustang dynos are known to be heart breakers.


The track is really the only good gauge <img src="https://www.cherokeesrt8.com/forums/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />


Then again running 11.3 A/F ratio on a NA motor is way too rich so maybe the tuner is not soo good.

OP who is your tuner?
.

Where do you think the a/f ratio should be ?
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post #12 of 22 (permalink) Old 04-07-2019, 09:58 AM
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It is pretty common knowledge that 12.5 is the target on a naturally aspirated motor under full load. Obviously, air fuel ratio is one variable so that target can differ but running 11.3 is way too rich on a naturally aspirated motor.
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post #13 of 22 (permalink) Old 04-07-2019, 12:10 PM Thread Starter
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Maybe I should look into a retune from somebody else if they don’t email me an adjustment any recommended tuners I’m in MA so I’ll have to do email tunes with my in tune
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post #14 of 22 (permalink) Old 04-08-2019, 07:44 PM
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Maybe I should look into a retune from somebody else if they donít email me an adjustment any recommended tuners Iím in MA so Iíll have to do email tunes with my in tune


I think AJ - Hemituner is in that area. He is legit.
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post #15 of 22 (permalink) Old 04-09-2019, 01:57 PM Thread Starter
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I gave him a call and I’m going to set something up in a couple weeks thank you for the advice much appreciated it’s about a 4 hour ride from where I am but if I plan it correctly then it will be well worth it
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post #16 of 22 (permalink) Old 04-11-2019, 09:00 PM
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My Stock 2014 Jeep SRT Dynoed 379 on a Mustang dyno, which reflects a 19.3% power train loss.

The Jeep is now fully built and have the comp 270 cam in addition to lots of modifications. I remember the folks at Comp Cams telling me the duration on the exhaust side was designed to move out much of the exhaust gases under load, and they highly recommended long tube headers.

It sounds like the tuner had to richen the mixture trying to overcome the large amount of exhaust gases remaining in the cylinders. You might want to put a set of long tube headers on the vehicle before you attempt to tune it again.
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post #17 of 22 (permalink) Old 04-15-2019, 06:21 AM
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It sounds like the tuner had to richen the mixture trying to overcome the large amount of exhaust gases remaining in the cylinders.

That doesnít make sense
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post #18 of 22 (permalink) Old 04-17-2019, 07:24 AM Thread Starter
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They had no reason telling me why it was rich besides that the tuner likes to keep things rich because people like to tow with them ???? I’m like I’m not towing anything with mine and I wanna do long tubes but I live in MA and not sure if I’ll pass the new inspections here all I can do is ask people from MA if they have any problems getting a sticker or just walking into my inspection station and ask but at the same time I don’t wanna do that because then they will know for sure it has long tubes so was going to start a thread about that when I got a minute
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post #19 of 22 (permalink) Old 04-17-2019, 07:27 AM Thread Starter
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Also don’t know much about tuning but aren’t our stock manifolds half decent I thought ? I mean enough to handle a comp 270 I know it’s not a crazy intense cam just a good all around
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post #20 of 22 (permalink) Old 04-18-2019, 04:30 AM
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Also donít know much about tuning but arenít our stock manifolds half decent I thought ? I mean enough to handle a comp 270 I know itís not a crazy intense cam just a good all around


You donít need long tubes so donít sweat it.

All you need is a better tune from someone reputable. That mixture level is stupid rich for a naturally aspirated vehicle.
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