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post #1 of 13 (permalink) Old 04-16-2019, 08:38 PM Thread Starter
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400 hp?

I am considering some mods on my 2016 RT A8. If I add a Legmaker CAI, a 85mm TB, short headers and a tune can I get 400 HP at the crank? Thanks for any advice
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post #2 of 13 (permalink) Old 04-16-2019, 09:19 PM
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400 hp?

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Originally Posted by RTguy_1961 View Post
I am considering some mods on my 2016 RT A8. If I add a Legmaker CAI, a 85mm TB, short headers and a tune can I get 400 HP at the crank? Thanks for any advice


Possibly. It would be easier done with a mild cam swap or longtube headers.


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2013 Challenger R/T Automatic
HP Tuners tuned, 270 Comp cam, BES ported heads, 3.91 rear, Driveshaft Shop one piece aluminum driveshaft, OCPerformance dual plane intake manifold, 88mm Fastman ported throttle body, custom side dump straight pipes, JBA longtubes and a healthy shot of giggle gas via Nitrous Express
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post #3 of 13 (permalink) Old 04-17-2019, 06:37 AM
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Well your already at 375 hp stock - and that probably would dyno a little higher so lets say - 385 stock. Your only 15 hp away from your goal. I would think you should hit it. But as "newoldchallenger" said, LT headers for sure will get you there with a cam swap. You'll be producing quite a bit more than just 400.

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post #4 of 13 (permalink) Old 04-17-2019, 02:51 PM
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I'm thinking, buy a tuner and get that car married to higher octane gas... Goal accomplished.

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post #5 of 13 (permalink) Old 04-17-2019, 02:57 PM
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On a stock 5.7, long tube headers should net ~20HP.
https://www.hotrod.com/articles/bam-...emi-tti-pipes/

FYI the dyno sheets show RWHP not crank HP.

BTW cost will be about $250 for PCM unlock, ~$300-650 for tuner, ~$1200 for headers and ~$250 for tune. Got to pay to play.


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post #6 of 13 (permalink) Old 04-17-2019, 04:03 PM Thread Starter
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I realize LT will gain more HP, but I don’t want to have to worry about CEL issues or clearance issues. I don’t need a cam as I won’t race it..... just curious about what a few minor mods will do. Thanks all.
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post #7 of 13 (permalink) Old 04-17-2019, 04:21 PM
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Quote:
Originally Posted by RTguy_1961 View Post
I realize LT will gain more HP, but I don’t want to have to worry about CEL issues or clearance issues. I don’t need a cam as I won’t race it..... just curious about what a few minor mods will do. Thanks all.
If you run high flow cats and O2 sims you should not have any CEL issue.

O2 Simulators
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post #8 of 13 (permalink) Old 04-17-2019, 04:50 PM
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Been running high flow cats for almost a year now on my 2016 R/T with stock 02’s and 392 shorties, never once through a code. Maybe im lucky?
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post #9 of 13 (permalink) Old 04-17-2019, 05:15 PM
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Originally Posted by trippytro View Post
Been running high flow cats for almost a year now on my 2016 R/T with stock 02’s and 392 shorties, never once through a code. Maybe im lucky?
Depends on how the tune was setup. Most have the rear O2s deactivated by raising the ECT. This will prevent CEL or DTCs from showing up but it also prevents the emissions O2 monitor from completing. I personally am running with all DTCs enabled, rear O2s enabled and I added O2 sims (just for added measures) and so far all the emissions monitors but the O2s (need to perform the drive cycle) cleared. BTW I went to the IL emissions facility and they told me to come back when my scheduled emissions check is due (end of the year). I was like, why do I have to wait that long and the worker told me it is tied to plate registration renewal dates now. Really?
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post #10 of 13 (permalink) Old 04-17-2019, 06:51 PM
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400 hp?

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Originally Posted by ChallyTatum View Post
Depends on how the tune was setup. Most have the rear O2s deactivated by raising the ECT. This will prevent CEL or DTCs from showing up but it also prevents the emissions O2 monitor from completing. I personally am running with all DTCs enabled, rear O2s enabled and I added O2 sims (just for added measures) and so far all the emissions monitors but the O2s (need to perform the drive cycle) cleared. BTW I went to the IL emissions facility and they told me to come back when my scheduled emissions check is due (end of the year). I was like, why do I have to wait that long and the worker told me it is tied to plate registration renewal dates now. Really?


Go figure

I just recently tuned my vehicle i was running the high flows (solo 3” actually made for srt8’s) without a tune and no light

Although i will say, low end felt a little lack luster without the tune

Last edited by trippytro; 04-17-2019 at 06:57 PM.
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