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Old 01-19-2007, 04:56 AM   #1
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Default going to the dyno tommorrow!

last year i made 183hp and 180 ft llb torque.

Since then I have added a 2.5" dp to replace the restrictive greddy one.

Will i see any gains.

I am really going for a tune-up and to trim the maps as i feel I am running richer. If the tuner can lean out the maps I should make more power right?
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Old 01-19-2007, 09:35 AM   #2
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You'll see more hp/tq starting at a lower rpm and probably a bit of top-end, did you ever swap the catback?
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Old 01-19-2007, 10:53 AM   #3
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no...still 2.1/4 " cat back
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Old 01-19-2007, 10:56 AM   #4
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If you are adding more flow, your AFR should be leaner, not richer.
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Old 01-19-2007, 12:45 PM   #5
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That 2.25 is killing you.
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Old 01-19-2007, 09:42 PM   #6
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the 2.25 is killing you! i just did a 2.5 dp and 3 inch exhaust all the way back and i went from 132rwhp to [email protected] only... get it done bro...
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Old 01-19-2007, 10:11 PM   #7
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come on....leave us alone
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Old 01-20-2007, 01:03 PM   #8
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Quote:
Originally Posted by myfonti View Post
the 2.25 is killing you! i just did a 2.5 dp and 3 inch exhaust all the way back and i went from 132rwhp to [email protected] only... get it done bro...
holy ****. Details on 3" job?
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Old 01-21-2007, 07:29 AM   #9
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I take on board what you said.

I am convinced I need to open the exhaust up but to make an extra 20 rwhp seems unrealistic to me.

I cancelled the dyno time as it was pointless. Only addition since I last went was a 2.5 " downpipe.

Gonna go back when I have:

Bigger intercooler with less restrictive pipe run ( too many bends)
2.5 exhaust cat back
Water Injection

Thing is I am split between getting the aboave done and a new paint job?
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Old 01-21-2007, 03:20 PM   #10
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Tabs you might want to add bigger injectors to that list also.
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Old 01-21-2007, 05:59 PM   #11
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Bling king needs new paint?

Whatever the whp gain, opening the exhaust will be worth it.
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Old 01-21-2007, 08:50 PM   #12
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based on the pics ive seen of your car IMO your paint's fine
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Old 01-22-2007, 12:53 AM   #13
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unless you find a really good fabricator, then 2.5 is all you can fit on the miata... if im not mistaken, even begi's divorced 2.75 dp is only 2.5 down to the firewall, then connects with the opening at 2,75... my fabricator charles told me that 2.5 all the way would be good... but then after dynoing the car with 2.5 dp and 3 the rest of the way back, he was surprised... anyhow, get it done bros!
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Old 01-22-2007, 04:37 AM   #14
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I have 3" turbo back on my car, the only problem spot is the downpipe and going around the diff but for a good fabricator shouldn't be that big of a problem. I'm sure I gained at least 30+whp after going from 2 1/4" downpipe and 2 1/2" exhaust with cat to 3" downpipe and 3" catless exhaust. Spool up and response is waay better now too.
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Old 01-22-2007, 05:01 AM   #15
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Originally Posted by Rage_Kage View Post
based on the pics ive seen of your car IMO your paint's fine
I know the paints fine.

However i am after a colour change and want to ditch the decals.

But for $380 shipped to the UK the DO Water injection kit with progressive controller seems to good miss out on!
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Old 01-22-2007, 03:12 PM   #16
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Quote:
Originally Posted by RusMan View Post
I have 3" turbo back on my car, the only problem spot is the downpipe and going around the diff but for a good fabricator shouldn't be that big of a problem. I'm sure I gained at least 30+whp after going from 2 1/4" downpipe and 2 1/2" exhaust with cat to 3" downpipe and 3" catless exhaust. Spool up and response is waay better now too.

I have the opposite problem. no room on the downpipe but plenty in the rear around the diff even with the 01+ bracing.
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Old 01-22-2007, 10:37 PM   #17
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you dont like the mariner blue? i understand about the decals but i love the color, then again mine's mariner blue
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Old 01-24-2007, 10:16 AM   #18
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It is worth it to go 3" turbo back. My WRX made an additional 30 hp to the wheels when I went from the stock 2.25" to a full 3" and tuned for it. (I did eliminate 2 cats though) If you are going to have your parts fabricated anyway do it right the first time so you aren't kicking yourself later.
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Old 02-08-2007, 04:34 PM   #19
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I am going tomoz to the exhasut fabricator to get 2.5" HAUST ALL THE WAY BACk.

Hope its not too LOUD!!

Will post some pics up.
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Old 02-08-2007, 04:35 PM   #20
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how are you plumbing the muffler(s)?
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