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#1 |
![]() Join Date: Nov 2010
Location: Omaha
Posts: 402
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On the flight down right now to pick up the Z from Corey Henderson's. Following is a brief list of all the work that was done:
OBX Long Tube headers installed Fuel Injectors installed (from Fuel Injector Connection) 4.10 speedo gears installed C4 beam plates Removed secondary throttle blades new plugs Updated top end port work Dyno tune Final numbers were 360RWHP, which while not earth shattering is way better than the 300RWHP that I was getting. Corey said it didn't look like the secondaries had been working in quite a while. He also said the he would guess that I could probably gain another 20HP with a better flowing exhaust (currently have a Borla) and maybe a 160 thermostat. I was also thinking that I should probably MAT sensor relocation too. He said he was about 2.5 degrees short of where he normally can set the timing to without knock. I didn't have time to really talk with him in depth as he was finishing up and getting ready to go to BG. For any of you interested in OBX headers, make sure you ask him his opinion if you are there. If not, I will request a full email opinion on them and post it on here later. Can't wait to get there and drive the car. Should definitely be a lot of fun now! ![]() |
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#2 |
![]() ![]() Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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please request an email from him as i won't be able to make it to bg this year
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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#3 |
![]() Join Date: Nov 2010
Location: Omaha
Posts: 402
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Already requested. His initial comment was that they took a little "tweaking" to fit right. Also, he's not sure how much of the power I'm leaving on the table is the headers and how much is the Borla exhaust. My guess is the Borla as it really constricts before going into the resonator.
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#4 |
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 2,450
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Corsa time
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#5 |
![]() ![]() Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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__________________
It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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#6 |
![]() ![]() Join Date: Aug 2005
Location: Northridge, CA
Posts: 1,457
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It's the Borla resonator that is restricting.
Switch it out for a B & B X-pipe. You will gain the HP. How do I know......... |
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#7 |
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 2,450
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I think you may get drone from B&B
Thats why I like the Corsa, no drone |
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#8 |
![]() Join Date: Nov 2010
Location: Omaha
Posts: 402
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I think I'm going to try replacing the resonator with an x-pipe first and see what that does. It's a whole lot cheaper than a completely new exhaust.
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#9 | |
![]() Join Date: May 2008
Location: USA
Posts: 1,096
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The most you are leaving on the table is 5-10 hp on account of the resonator. You can modify your existing reasonator or get an LT-4 resonator. The X pipe will make resonance. Headers definetly give you 20hp and with a good exhaust you are golden. To me anyway, unless its 20HP increase or more, the seat of the pants dyno is not affected. I understand maximizing HP especially cheap hp. Just keep in mind there are trade offs. I think you can gain 20hp by switching from Borla to B&B which is a bigger less restrictive system and also much louder with more rumble. The exhaust claims I think are overstated. When the Borla came out in 1990, I have an ad that came from a reputable shop in Florida, I think it was in corvette fever, it says 40 HP increase from exhaust over stock - I'm sorry no way do I believe it. I think half the time you have to cut the claims in half in most people's applications. Good luck do your research, I have thought about the X pipe as well and asked about it in the past. Most concur X pipe equals resonance. I am happy at my HP level so I have decided I don't need the extra 5-10hp. I have thought about modifying my resonator or switching it out but not sure how that would turn out in the end. Marc Haibeck can give you more information on it, I think he even has an article about it. I am not a big fan of the borla tips and how they hang. I have found a few nice examples of B&B tips and have thought about changing them out. I just need to find a good welder and an exhaust shop I can trust. The Borla gets alot of bad press but I like it. It's more of a "sleeper exhaust" and does not have drone. I have heard all the others. The one that appeals to me is the B&B but sometimes I think it is too redneck for my tastes. It sounds nasty and like a racecar but as I get older, I like a more understated exhaust. Maybe its all the imports with fart can exhausts that turned me off to the loud exhausts. Good Luck Last edited by xlr8nflorida; 05-13-2011 at 11:20 AM. |
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#10 |
![]() Join Date: Nov 2010
Location: Omaha
Posts: 402
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Hmm, might have to try an LT4 resonator. I really don't like drone. My 92 LT1 had no mufflers and an x-pipe, and it was a little too much.
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