2009 BH Sedan 3.8L V6 Performance & starter mods (w/Dyno figures)

[fourthirteen]

Did you order the test pipes or were they custom made? Any CELs after cat delete?

 

[HAZ JOV6]

Did you order the test pipes or were they custom made? Any CELs after cat delete?

No CEL.

I had them custom made at exhaust shop ... mainly for 2 reasons:
- size: didn't want 2.5"/3" size which most vendors doing if those test pipes.
- the selling price ($180) is much exagerated for what these are.
This cost me less than $60 installed... assume to cost around $70-80 in US.

 

[Franky99]

So I ended putting 2" test pipes in secondary cats location .. I HIGHLY RECOMMEND SEC CAT DELETE TO EVERY V6 (do in pipe size 2").
View attachment 52411
Sound: (exhaust system & mufflers all stock aside from these pipes)
Inside Zero Rasp, Zero Cabine drone.
Outside a tid little bit louder than stock at higher rpm, a luxury powerful sound vroom vroom.

View attachment 52408
Performance: It has been a week of excited driving with the butt feel of added power. Finally I took it doing 3 #Dyno pulls. Made 269, 266 & maxed 272whp at end. That a gain of +14rwhp/+15N.m after test pipes compared to 258whp before (with stock secondary cats/resonators). Better is gain occuring all over rpm range.
View attachment 52412

pass smog? I’m in CA USA

 

[HAZ JOV6]

pass smog? I’m in CA USA

I'm in the "no CA" rest of the world .. no official smog test

 

[HAZ JOV6]

ECU Bench tuning, succeeded by local tuners. Throttle signal re-mapped, Partial Throttle and street performance imporoved significantly. Feels like driving a new car .

But for being off-dyno cautious map programming, we didn't see noticiable WOT gains at the dyno. Tried couple maps, for barely any top WOT hp. So I settled for what it is, rather than do more re-tunes (I don't race/track).


Tuned By Khaled:

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[flick0202]

In past weeks, after Throttle Body Coolant Byoass I had the engine decaebonized with Hydrogen Pulses Carbon Cleanig, which has shown an immediate noticable enhanced performance & throttle response.
View attachment 47964
Today I put her on same dyno (Mustang Dyno), to get a numeric expression of my buttdyno feel of a/m 2 changes.
And that feel of "enhanced throttle response" during past weeks, translated in numbers as: within range 2500h4500rpm, increased torque of +15~25 wN.m & power +10~15 whp.
Maxed top end at 258whp. (+5whp from last test)

I guess my buttdyno was reading correctly, as I bet friends it's a 10+hp thing .
Per buttdyno, I would esrimate the result be divided as 30:70 between throttle body coolant bypass : carbon cleaning.

View attachment 47965

P.S: decarbonizing actually restores lost ponnies rather than adding power.

How do you do that cleaning I have a 2016 I recently got the mufflers deleted and I plan on getting the secondary cats out and a boxed intake. Mine comes stock at 311 but I assume I already had power gains deleted the mufflers. Anyway just wondering how to do the carbon cleaning.

 

[HAZ JOV6]

How do you do that cleaning I have a 2016 I recently got the mufflers deleted and I plan on getting the secondary cats out and a boxed intake. Mine comes stock at 311 but I assume I already had power gains deleted the mufflers. Anyway just wondering how to do the carbon cleaning.

for carbon cleaning check www.carbon-cleaning.com for your nearest shop, I did it at their local agent shop.
(there might be other companies doing similar method, but ensure it is Hydrogen PULSES -not continuous).

And I highly recommend sec cat delete .. I saw huge gain relative to this small job / low cost mod.

 

[HAZ JOV6]

How do you do that cleaning I have a 2016 I recently got the mufflers deleted and I plan on getting the secondary cats out and a boxed intake. Mine comes stock at 311 but I assume I already had power gains deleted the mufflers. Anyway just wondering how to do the carbon cleaning.

and for your 2016, being a GDI .. carbon cleaning is very advisable, as these engines have the reputee of carbon build on internals.

 

[flick0202]

for carbon cleaning check www.carbon-cleaning.com for your nearest shop, I did it at their local agent shop.
(there might be other companies doing similar method, but ensure it is Hydrogen PULSES -not continuous).

And I highly recommend sec cat delete .. I saw huge gain relative to this small job / low cost mod.

Thank you I def will get those cats out as well as get the carbon cleaning done

 

[flick0202]

ECU Bench tuning, succeeded by local tuners. Throttle signal re-mapped, Partial Throttle and street performance imporoved significantly. Feels like driving a new car .

But for being off-dyno cautious map programming, we didn't see noticiable WOT gains at the dyno. Tried couple maps, for barely any top WOT hp. So I settled for what it is, rather than do more re-tunes (I don't race/track).

View attachment 52676
Tuned By Khaled:

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Looking for a tuner in Seattle area willing to drive a couple states

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[HAZ JOV6]

Looking for a tuner in Seattle area willing to drive a couple states

Good Luck

 

[HAZ JOV6]

Axle back exhaust worked:
Stock Mufflers Deleted ... Replaced them to Straight Through 2" Resonators, matching oem piping size.

Sounds very good (to my terms), especially with added parallel Helmoltz canisters that worked magic on cabine drone (hidden above resonators).

Street performance didn't yield magic, but it did pull harder apperant toward higher rpms.
I had it for dyno pulls after driving few hundreds miles. Low end torque almost unchanged, mid range rpm drops a bit, then from 4.5k it starts to gain toward top end as expected.
Net gained 3-4whp at top end.

(dots & dashed lines from dyno history)

 

[HAZ JOV6]

I had great exchange bargin offer on pair of these
Hyundai oem straight through resonators. Measuring 16" length & 2" inlet-outlet (inside bore looks a bit larger, may be around 2.25").

Expecting these to be of better build quality and having the oem touch, I've fitted these in place of 2" generic resontaors I had put in my 3.8L rear stock mufflers delete job.

Exhaust tone sounds same -almost unchanged, may be a tiny bit deeper than generic ones. But I'm %100 certain the car now with these, picks up MUUUCH BETTER at lower rpm range (2k-3k) !!


P.S: I guess these FOF20 resonators came on Hyundai Azera, google said

 

[HAZ JOV6]

On a fixed 25km road stretch with repeated driving conditions, looks like car is doing a lil better to fuel tank in cruising/daily commuting after rear mufflers replacment.
Reaching down to 5.1- 5.2 Lt/100km repeatedly.
(was in 5.3-5.4 zone on said metered road & conditions)

 

[HAZ JOV6]

Turned out those Hyundai FOF20 through resonators did make a difference, no placebo .

Had it on dyno for few pulls starting from lower rpms. Car starts in a good early torque boost between 2000-2500rpm , then mantains a nice flat curve, untill it start to pickup again after 4000rpm.


Gas pedal gets more tempting with this early torque pump

 

[HAZ JOV6]

While lifted for brakes change, I noticed exhaust pipes at mid pipe resonator exit are necking in size! .. While all pipes before and after, measure 50mm .. this portion measured 45mm.

Got them cut and replaced to 50mm pipes .
Eliminating a bottle-neck with %25 more flow area.

When I removed similar bottle-neck of OEM mini resonators (which were in place of sec cats), it got 14whp pump, so this must put a pony or a few gain here or there.

I thought of straight piping the mid section with resonator delete. But when we cut the pipes, saw clearly that mid pipe resonator is all straight through 2" .. so kept it to keep exhaust tone at drone risk free.

Exhaust sound change = None
Performance = No high bets, but I do feel something .
(placebo .. could be)

 

[HAZ JOV6]

Working on the mid pipe section. also noticed a crushed section in pipes before resonator.


Had this section also worked:
no sec cats > straight d50mm pipes > OEM resonator > d50mm pipes to rear mufflers.

Results:
Exhaust Sound : No noticed change

Performance: it does feel better at the throttle .. (no measures).

 

[HAZ JOV6]

photo of modified mud sectiin exhaust setup:
sec cat delete > 2" pipes > OEM stock resonator > 2" outlet pipes at resonator outlet (> stock tail pipes + mufflers)

Quite inside/out .. yet gave a very clear pump to performance and throttle response at low end.


(sec cat delete alone had yield 14whp, & the recent tweeks show even more improvements)

 

[HAZ JOV6]

Having an HKS superflow filter thats left from a previous car mods, the itch to install it kept coming.


Eventually removed intake airbox and slapped this on MAF. With my custom silicone intake hose, a fabricated home-made heatshiled to keep filter away from engin bay heat, and keeping oem intake air snorkel feeding fresh air into the isolated filter zone.

All in all result in a tid better perfromance compared to K&N drop-in filter in the box, with noticable rise in engine roar

 

[HAZ JOV6]

Exhaust Re-Cap:
* Primary cat outlet flang bore 46mm.
* Stock exhaust pipes bore 46mm, neck down to 42-43mm in various points (pipe elbows before flex pipes, after mid resonator, and crushed section before mid resonator).
* Sec cat delete a simple & efficient mod, added 14whp & tiny bit of sound.
* Stock mid resonator is a straight through 2way x2".
* Rear muffler delete: swapped to 2" straight through resonators gave it good roar but just a slightly noticiable performance gains, with drone kill by parallel Helmoltz canister.



>> Exhaust Re-Worked, from primary cats onward:

- all stainless steel 2" piping, bore 48mm (on average an increase of %12 in flow cross-section)
- X-pipe element in place of sec cat deletes
- kept stock middle section resonator and put back stock rear mufflers.

>> Final Results (combined with intake modification to HKS filter behind a home-made custom heatshield):
- Performance: absolutely feels pulling stronger in all gears, low to high rpm.
- Sound: no drone, quite in crusing low rpm, with a deep louder growel at higher throttle. Just a relative louder than stock (think of an all stock V8 growl).