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How much power increase when doing full exhaust?
I was wanting to get headers because my precats are starting to get clogged but I think I want to go full exhaust all at once (Cattman headers, y-pipe, fastcat, and 3" exhaust) I will be getting my tax return in January and this is what I have my eye on. For anyone running this setup did you notice a significant increase in power? BTW how much hp do you gain from a full exhaust? I read that the headers alone give up to 26hp
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40+ with a tune
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x2 /end thread
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at the wheels?
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Originally Posted by luvlexus101
(Post 7792556)
at the wheels?
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TOO much
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I did the full setup all at once. Honestly, I didn't notice as much in gains as I expected... but, I believe I'm running super rich because of my mods, so I'm getting my tune on for christmas :D (VAFCII, Wideband) Oh, and I don't have an intake, so I'm getting that too. Then hopefully I see that 35-40 or so hp that I'm supposed to see.
My point is... if you want the full gains, you usually need to tune your AFR as well. Full exhaust (esp. headers) will make our cars run pig rich... some more than others. |
Dont have the full set up but sure you will get good gains I cant wait to get them headers from Cattman!!:D
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Originally Posted by jowo9
(Post 7792817)
I did the full setup all at once. Honestly, I didn't notice as much in gains as I expected... but, I believe I'm running super rich because of my mods, so I'm getting my tune on for christmas :D (VAFCII, Wideband) Oh, and I don't have an intake, so I'm getting that too. Then hopefully I see that 35-40 or so hp that I'm supposed to see.
My point is... if you want the full gains, you usually need to tune your AFR as well. Full exhaust (esp. headers) will make our cars run pig rich... some more than others. |
Originally Posted by CMax03
(Post 7796113)
That Oem intake is restrictive, I made 8whp peak w/that overly restrictive Injen Intake which made about 12-14 whp over the Oem (under the curve) in the midrange. The midrange was awesome with this Injen but over 6K it's a bit too long (39") to move air as fast as the engine needs it.... Make yourself a SRI or switch to a JWT popcharger and you see the difference.....
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Originally Posted by greymaxima
(Post 7827425)
what is sri
OP: I'll say this...I did a few power-adder mods to my car before getting headers. Intake, exhaust, and NWP block plate, specifically. Of the four mods, I/H/E/BOP, the headers were the only "holy ****" mod as far as actually being able to feel the gains. Coupled that with a test pipe a few months later, and I picked up a ton of midrange torque. |
SRI stands for (Short Ram Intake).....these intakes seem to work better with the VQ35 IMO, longer intakes can't flow as fast as the shorter intake.....Maybe using a 3.5"-4.0" intake tube would work I'm not sure, but I do know Injen's Intake becomes restrictive at higher rpm's cause the systems way too long! The normal theory as usual in engine breathing dynamics short for power/ long for torque!
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Originally Posted by CMax03
(Post 7828253)
The normal theory as usual in engine breathing dynamics short for power/ long for torque!
Knowing my limitations on engineering considerations like this, I'm content enough to accept the way it works, without understanding why it works. |
Found this some time ago and it may be of some help on understanding it. Makes sense to me
When the intake valve is open on the engine, air is being sucked into the engine, so the air in the intake runner is moving rapidly toward the cylinder. When the intake valve closes suddenly, this air slams to a stop and stacks up on itself, forming an area of high pressure. This high-pressure wave makes its way up the intake runner away from the cylinder. When it reaches the end of the intake runner, where the runner connects to the intake manifold, the pressure wave bounces back down the intake runner. If the intake runner is just the right length, that pressure wave will arrive back at the intake valve just as it opens for the next cycle. This extra pressure helps cram more air-fuel mix into the cylinder -- effectively acting like a turbocharger. |
I think the order in which the mods were installed have an affect of the so called results
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torque steer will be an issue lol....but definitely well worth it. i have yet to set down and tune, but its plenty quick with the additions ive made. I would have to say with the 3 inch installed first it was a big difference. and then doing the headers it was another notable/pleasant difference. should have the wideband and utec installed by the 8th of next month sooooo...let you know how it goes from there. but pull the trigger you wont be disappointed.
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I find it has less torquesteer with ES motormounts, Xmember bushing, Illuminas, and Progress springs than when it was all OEM!
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havent done the mounts yet. Waiting on summer. Coiloover install will be complete then as well.
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wow so my 300WHP goal is that easy to achieve! SWEETNESS! Throw in some cams and I'm set.
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take into account driveline losses, and your not starting at 255 ;)
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Originally Posted by BoDenKai
(Post 7829743)
wow so my 300WHP goal is that easy to achieve! SWEETNESS! Throw in some cams and I'm set.
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Take into account the age of your car and the amount of miles, people always seem to ignore that fact so you wont be starting from 255hp
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over 9000
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I had no torque steer with Eibachs, Illuminas, and FSTB.
A consideration when talking Injen CAI (LRI) is that the stock Maxima can boil the tires from a start as it is. Taking away some low-range power in that aspect won't hurt 1/4-mile times that much. Regardless, I found a GAB to be better than the Injen. |
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