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05-22-2006, 10:14 PM | #1 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
Impression: Borla header vs. Ported and coated exhaust manifold
With help of my buddy, we were able to take off Borla header and put ported exhaust manifold on today. Install went longer than expected because bolts were badly rusted and one of stud came off.
Impression: Borla header: lack of low-end torque, but makes up with improved top-end power. Raspy sound that replaces famous boxer engine sound. Ideal for all out power. Ported and coated exhaust manifold: good low-end torque and midrange power. Porting helps to improve top-end power slightly below power range of borla header. Car is noticeably louder with deep boxer rumble. Ideal for every day driving. In 1st and 2nd gear, car feels extremely smooth and powerful similar to feeling I had when I drove my buddy's STi. My car is getting Protuned again on 6/7/06. Will post dyno chart for comparison (Borla vs. Ported stocker). Car dyno'd 262whp and 272wtq with Borla header. 80whp and 140 wtq @ 3000rpm.
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05-22-2006, 10:38 PM | #2 |
Scooby Specialist
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make sure to get some graphs of boost while you are dyno'ing.
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05-22-2006, 10:54 PM | #3 |
Street's closed, pizza boy
Member#: 17301
Join Date: Apr 2002
Chapter/Region:
MAIC
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Vehicle:2018 Focus RS 2006 Evo #17 STU |
Please post a link in this thread when you do get tuned
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05-22-2006, 10:56 PM | #4 | |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
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Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
Quote:
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05-23-2006, 12:03 PM | #5 |
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Vehicle:2004 JDM Headache |
port looks good
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05-23-2006, 12:44 PM | #6 |
Scooby Guru
Member#: 59454
Join Date: Apr 2004
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NESIC
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Vehicle:'10 E92 M3 M-DCT brentuning.com/blog |
how long did it take you to swap im putting mine on soon
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05-23-2006, 01:07 PM | #7 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
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Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
took about 2 hours... damn stud.
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05-23-2006, 06:03 PM | #8 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
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Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
Spent some more time today driving around. Top-end power is reduced noticeably while low-end power is significantly improved. Car just doesn't pull hard anymore. It's possible that my car was custom tuned to work specifically with Borla header. My tuner (XX-Tuning) said that aftermarket header won't require a retune, but it's worth to recheck it.
Will find out when I get a protune again. |
05-23-2006, 06:18 PM | #9 | |
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Vehicle:2022 WRX Limited WRB |
Quote:
I've since upgraded to a VF34 turbo and better intercooler. I'm almost curious enough to wrap the header and try it again, including running one step colder plugs and having the tuner play games with ignition timing and A/F mixture to try to keep the EGT's higher, but I'm not sure it's worth the $200 for tuning time just for an experiment. The VF34 with ported/ceramic coated stock manifolds spools about the same as the stock turbo did with the header. And I'm not willing to give up another 500 RPM of spool if that's what putting the header back on would do for me, even if it does mean a few more top end hp. |
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05-24-2006, 02:11 AM | #10 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
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Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
I am thinking about going back to Cobb OTS map to see if it makes any difference. It may be safer to run OTS map until I get a new tune...
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06-06-2006, 08:37 PM | #11 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
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Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
I am getting a Protune again tomorrow. Will post two charts for comparison purposes.
1. With Borla header (262 whp, 272 wqt) 2. Ported and coated stocker ??? All parameters will stay the same (will try my best) including boost level, etc. |
06-06-2006, 08:46 PM | #12 |
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Vehicle:'10 E92 M3 M-DCT brentuning.com/blog |
get dyno'd elsewhere, JM2C.
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06-06-2006, 08:49 PM | #13 |
Scooby Guru
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Why do you think that way I should get a tune elsewhere?
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06-07-2006, 07:50 PM | #14 |
Scooby Guru
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Very strange things happened today. When I brought my car in for dyno at XX-Tuning today, baseline boost level was recorded to be around 19psi, up from 17.5psi. In April, car was tuned to run at 17.5psi...
Only thing that I did to my car since previous Protune was getting ported exhaust manifold and panel K&N filter. I highly doubt that those two mods would increase boost level up to 1.5psi. Anyway, baseline dyno number (first chart) pretty much matched previous dyno number (2nd chart) with Borla header (261whp) in terms of HP, but torque was a little bit off. This may be expected as this map was not designed for ported exhaust manifold. After correcting AF ratio and tweaking various parameters Chris was able to bring whp up to 282whp level at 19psi tapering off to 16psi at redline. 06/07/06 Protune with ported exhaust manifold: Protune from April with Borla header: Last edited by txl146; 06-07-2006 at 08:02 PM. |
06-07-2006, 07:56 PM | #15 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
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Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
It's important to note that baseline numbers from first chart is done with ported exhaust manifold and K&N panel filter although map was originally made to run with Borla header.
I don't think we can draw any conclusion based on these two charts as there are several variables: 1. Different tuners (previous tuner could never make >262whp even at 22psi). 2. dirty paper filter vs. K&N panel filter (previous tune was done using filthy air filter). Last edited by txl146; 06-07-2006 at 08:18 PM. |
06-07-2006, 08:05 PM | #16 |
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so the end numbers were about the same, what about the spool characteristics, peak torque come sooner?
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06-07-2006, 08:20 PM | #17 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
It is possible that ported exhaust manifold allowed car to improve low-end torque (~40 wtq @ 3250rpm) and horse power. However, it could also be that tune was more efficient in extracting power out of engine.
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06-07-2006, 09:09 PM | #18 |
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Vehicle:'10 E92 M3 M-DCT brentuning.com/blog |
looks like a better tuen with more boost to me
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06-08-2006, 12:24 AM | #19 | |
Scooby Specialist
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Vehicle:02- 2.5 Hybrid GrimmSpeed |
Quote:
definitely must be the port job look at torque at 3k rpms...thats what a pnp'd mani will do for you along with a good tune +30-40wtg is crazy |
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06-08-2006, 12:31 AM | #20 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
Oh, I got my exhaust manifold ported by jdgrimm.
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06-08-2006, 01:41 AM | #21 | |
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Quote:
I've been talking Justin up all over these forums. There's also a link in the Car parts review thread. |
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08-22-2006, 03:45 PM | #22 |
Scooby Guru
Member#: 32459
Join Date: Feb 2003
Chapter/Region:
Tri-State
Location: NY
Vehicle:02 WRX VF34 (SOLD) Junior Tuned 301whp |
I've received several PM's about my P&P'd exhaust manifold. Here is a bump for those who PM'd me.
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