Mazdaspeed mx5 with water meth kit 0-120 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-27-2009, 07:26 PM   #1
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Default Mazdaspeed mx5 with water meth kit 0-120

My mazdaspeed mx5 with a Devils Own water/meth injection kit, a Flyin Miata intake with manual boost controller set at around 14 lbs boost, & a Flyin Miata downpipe.

Launched at about 2500 rpms in 1st gear & went to 120 mph in 6th gear with 225lbs camera man passenger.


Launched at about 3000 rpms in 1st gear & went to 110 in 5th gear with 225lbs camera man passenger.
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Old 01-27-2009, 07:45 PM   #2
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That will get it warmed up quick.
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Old 01-27-2009, 08:23 PM   #3
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I compaired mine and your video, seems were the same acceleration wise to about 90, then I start slowing down. aerodynamics maybe? Or possibly my stock crap cooling system getting hot causeing a reduction in timing. Cool video!
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Old 01-27-2009, 08:24 PM   #4
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so how are you getting around the 11psi fuel cut? The exhaust sounds loud for having just a FM dp and stock exhaust.....
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Old 01-27-2009, 08:56 PM   #5
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Quote:
Originally Posted by Doppelgänger View Post
so how are you getting around the 11psi fuel cut? The exhaust sounds loud for having just a FM dp and stock exhaust.....
I have the boost cut resistor modification to bypass the boost cut but I think my boost sensor went bad because I took the boost cut resistor mod off the boost sensor & still do not get the boost cut anymore.

As far as the exhaust goes I disconnected the muffler from the mid pipe & put in a temporary turn down pipe for the fun of it. I also removed the large rubber boot that covers the shift lever hole so noise comes up from the engine through the hole more. I bought a test pipe a while back for my 93 miata that fits where the cat converter is but i modified it to fit where the muffler connects to the midpipe on my mazdaspeed mx5 & every once in a while I put it on my mazdaspeed mx5. It is loud.

I also have the throttle position sensor disconnected.

Last edited by MSMjohn; 01-27-2009 at 09:06 PM.
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Old 01-30-2009, 12:38 AM   #6
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so how does disconnecting the TPS benefit you?
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Old 01-30-2009, 02:49 PM   #7
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Quote:
Originally Posted by Doppelgänger View Post
so how does disconnecting the TPS benefit you?
The stock ECU causes the engine to run lean until the computer goes into open loop mode around 5000 rpm's . Disconnecting the TPS makes the engine run rich & gets rid of the lean spot.
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Old 02-02-2009, 04:45 AM   #8
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I have a devils own watermeth kit, went to HS with the owner. Great company and product
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Old 02-02-2009, 05:01 AM   #9
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What gears are in that thing? I used to top out 3rd around 80 in my old 90 with 96 Torsen and 225/50 15's.
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Old 02-02-2009, 09:07 PM   #10
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Quote:
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What gears are in that thing? I used to top out 3rd around 80 in my old 90 with 96 Torsen and 225/50 15's.
1st gear 28mph
2nd gear 47mph
3rd gear 65mph
4th gear 85mph
5th gear 107mph
6th gear 127mph

4.10
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Old 02-03-2009, 05:57 PM   #11
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Tell me more about the TPS disconnect, and how runinng 14psi on that setup is safe. If it's an alright thing to do for the long-run, I may consider it.
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Old 02-04-2009, 12:20 AM   #12
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Quote:
Originally Posted by Mazdaspeeder View Post
Tell me more about the TPS disconnect, and how runinng 14psi on that setup is safe. If it's an alright thing to do for the long-run, I may consider it.
Fix your WOT hesitation (TPS signal limit)
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Old 02-04-2009, 12:38 AM   #13
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I have no detonation at 14 psi with water meth .

Here are some videos of my car at 15 psi tps disconnected

60mph to 130mph at 15 psi water meth


30mph to 110 at 15psi water meth tps disconnected (watch in high quality HQ)

Last edited by MSMjohn; 02-06-2009 at 12:32 PM.
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Old 02-04-2009, 12:40 AM   #14
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Is your temperature gauge broken or something? Or do you always beat on the car when it's cold?
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Old 02-04-2009, 12:54 AM   #15
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For some reason that doesn't seem like a safe idea, as far as the TPS goes.
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Old 02-04-2009, 01:08 AM   #16
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Quote:
Originally Posted by patsmx5 View Post
Is your temperature gauge broken or something? Or do you always beat on the car when it's cold?
I did a stock temperature gauge linearization modification.



Mazda-Speed.com :: stock temperature gauge linearalization mod
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Old 02-04-2009, 01:25 AM   #17
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So you do beat on it when it's cold? I don't see why. That's a good way to seize a piston and cause excess wear.
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Old 02-04-2009, 01:30 AM   #18
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I think he's trying to say by posting that linearization link that it was not cold. dunno
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Old 02-04-2009, 01:40 AM   #19
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Quote:
Originally Posted by patsmx5 View Post
So you do beat on it when it's cold? I don't see why. That's a good way to seize a piston and cause excess wear.
my temp mod is slightly different in linerization from the one in the picture above. All these video's were taken after driving on the highway many miles pulling over for for a minute then taking off or driving on the highway many miles slowing down then taking off. The car is up to opperating temp in all the video's.
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Old 02-09-2009, 12:12 AM   #20
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Pretty quick car and sounds mean.
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