HF-mx5t's 3076 turboed trackday/street toy :) - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-25-2009, 05:26 AM   #1
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Talking HF-mx5t's 3076 turboed trackday/street toy :)

just a few pics of my 99% finished 400+ whp project na mx5(german sold cars were called mx5 in 92 )

started out as a modified greddy kit a few years ago..
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diy ic pipes, link , 440cc, all the normal bits.. running 15psi boost. Soon got tired of having just beeing a little slower that the regular porsches etc on trackday events. upgrades had to be done..
Tossed the 1.6 engine. put in a 1.8 from a protege, did not have a inlet manifold for a miata, so i buildt a quick and dirty diy one.
engine had carrillo rods, wiseco pistons, a t3/4 turbo, tial 38mm wg etc..
was running 22-23psi boost.. suddenly the porsches was not a problem.. would easily slide past a 996 gt3 on the back straight.. annoyed the hell out of the porsche guys, lotuses etc..

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engine had a coolant reroute 750cc injectors etc too.. but the workmanship on the header was not good, and the quality of the materials were not good either.. also had issues with heatsoak of brake components in the enginebay..

time to redo everything

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build a better header downpipe combo, for the gt3076 turbo.modified a enthuza 3" system with vband etc.
redid the coolant reroute a bit. better heat shields, rerouted brake lines.6 speed tranny, 3.6 torsen, afco's +++
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Engine internals are still the same, balancing of the engine is better, the head fully ported, and running maruha cams.
Engine mangement changed to a autronic sm4 1.09 and chevy ls2 coil setup.
Ran the engine like this a bit last year.. testing things out.. works GREAT.
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then some Inlet manifold changes.. redid the entire thing.
billet runners for the new manifold. watercut flange
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dual chamber design (sort of like the old grB cars. we have been using this design with great success on 520whp race/rallycross spec saab engines, cosworth engines etc) and running a 70mm tb.
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some finishing touches left a lot of places on the car.. but it almost there..
thanks to fm by the way, for great support on the afco setup..
Keith, i got all my parts installed, hoping to drive the car in a few days now.. will let you know how the 650/400 setup works :P

the speclist of this car has spiraled out of control the last few years, and i cannot really keep track of what has been done.. but i think the dash is one of few parts not touched.

First trackday test was in july..

sportscar club of norway had a trackday today.. lots of great cars.

Lotus exiges, porsche GT2, radical, 4rotor rx7. ++++


the car is a monster.. .65 bar boost. 3rd gear powerslides uphill on r888 tires, and set a laptime of 1min7 seconds. my friends GT2 with some ruf tuning(550hp, 780nm) did a 1.05something using r comps, racing suspension etc.



cant wait to get it properly tuned.. im expecting it to keep up with the modified GT2.


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My dad was a very quiet passenger for the last set of laps for the day.. while i was chasing my friends 4 rotor rx7

NEW WHEELS!!

lovin the black 15x9 6ul rims with r888 tires


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my first attempt at some decent looking shots of the car in its current spec.
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also. a clear shot of the engine in current spec all heat shields etc in place...
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also.. a very small clip of a testdrive near my garage..
YouTube - first test



Kind of a massive first post in the build theads.. but hey.. its almost finished now Hope you guys like what you see.


dyno time VERY soon. hoping for 400+


Harald F
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Old 08-25-2009, 05:41 AM   #2
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WOWWWWW

I am inspired to go big turbo in the future. Love your car man. It is an absolute pleasure to look at. I can only imagine driving it. I'm sure its on par with JayL's car which I absolutely drool over.

You should post more often
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Old 08-25-2009, 08:42 AM   #3
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Gotta love builds that don't leave you in suspense. Build it first show it complete, Awesome car! Must be a blast to drive.
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Old 08-25-2009, 08:46 AM   #4
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BRAVO! You win!
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Old 08-25-2009, 09:21 AM   #5
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Wow that is one seriously nice MX5!!!!
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Old 08-25-2009, 09:38 AM   #6
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Damn...nice build.
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Old 08-25-2009, 11:21 AM   #7
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noob
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Old 08-25-2009, 11:59 AM   #8
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!!!lol^ the truth, can be a bitch.... Welcome and awesome car!!
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Old 08-25-2009, 12:12 PM   #9
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Quote:
Originally Posted by y8s View Post
noob
I know right, everyone knows that location for the air filter is horrible.

Let boost be at 20 psi. The temp gain with turbo is about 14/15F per psi, or about 300F.

On a 90F ambient day, ambient absolute would be 90 + 460 = 550F.
The charge temp absolute would be about 550 + another 300 from the turbo, which comes out to 850F

Density would degrade by 65%: 550/850 = .64

The pressure ratio at 20psi is 2.36.

So, with the heat from the turbo, then the 236% more density from compression will be degraded by 64%: .64 x 2.36, or to about 1.51. Thus a huge chunk of the density/power was lost and the system is 300F closer to knock.

With a 90% efficient IC, .90 of the 300F temp rise will be taken out, or about 270F removed, thus leaving a net gain of 30F. This would leave a density loss of only 6% from the heat, or a net gain of 2.36 x .94 = 2.24, or an overall gain of 224% rather than the 151% without the intercooler.

This assumes the filter is in a position sourcing ambient air. Behind the radiator is one of the worst places, the temperate sourced from that area is going to be closer to 150-190F.

So, let's compare:

perfect conditions; 90F ambient + 30F after intercooler + 460F = 580F
unideal conditions; 90F ambient + [(190F intake + 300F turbo addition) x 90% intercooler] + 460F = 599F

550/580 = 6% density loss or overall gain of 224%
550/599 = 9% density loss or overall gain 217%

So if you dynoed at 350rwhp with the filter behind the radiator, you have a potential of a 25rwhp gain if you simply moved the air filter to somewhere that would source ambient air.

hopefully i did the math right....but you get the idea NOOB.
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Old 08-25-2009, 12:38 PM   #10
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Nice build. Wheres your downforce? When you have it you'll beat that GT2
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Old 08-25-2009, 12:45 PM   #11
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That is very bad *** how are you getting by tuv?
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Old 08-25-2009, 01:21 PM   #12
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Quote:
Originally Posted by Braineack View Post
I know right, everyone knows that location for the air filter is horrible.

Let boost be at 20 psi. The temp gain with turbo is about 14/15F per psi, or about 300F.

On a 90F ambient day, ambient absolute would be 90 + 460 = 550F.
The charge temp absolute would be about 550 + another 300 from the turbo, which comes out to 850F

Density would degrade by 65%: 550/850 = .64

The pressure ratio at 20psi is 2.36.

So, with the heat from the turbo, then the 236% more density from compression will be degraded by 64%: .64 x 2.36, or to about 1.51. Thus a huge chunk of the density/power was lost and the system is 300F closer to knock.

With a 90% efficient IC, .90 of the 300F temp rise will be taken out, or about 270F removed, thus leaving a net gain of 30F. This would leave a density loss of only 6% from the heat, or a net gain of 2.36 x .94 = 2.24, or an overall gain of 224% rather than the 151% without the intercooler.

This assumes the filter is in a position sourcing ambient air. Behind the radiator is one of the worst places, the temperate sourced from that area is going to be closer to 150-190F.

So, let's compare:

perfect conditions; 90F ambient + 30F after intercooler + 460F = 580F
unideal conditions; 90F ambient + [(190F intake + 300F turbo addition) x 90% intercooler] + 460F = 599F

550/580 = 6% density loss or overall gain of 224%
550/599 = 9% density loss or overall gain 217%

So if you dynoed at 350rwhp with the filter behind the radiator, you have a potential of a 25rwhp gain if you simply moved the air filter to somewhere that would source ambient air.

hopefully i did the math right....but you get the idea NOOB.
version 1 was pretty awful.
version 2 was a big improvement
version 3 is not as bad as 1, but has room for upgrades to cooler air.


edit: dont get me wrong, the build is awesome and has way more power than my sorry *** car!
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Old 08-25-2009, 01:47 PM   #13
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I'm just being funny Holmes.
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Old 08-25-2009, 01:50 PM   #14
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Awesome work Harald!
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Old 08-25-2009, 01:51 PM   #15
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Quote:
Originally Posted by magnamx-5 View Post
That is very bad *** how are you getting by tuv?
I think he is in Norway - so that lucky bastard doesn't have to get the bloody TV. I think his car is imported from Germany or something like this...

Greets
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Old 08-25-2009, 02:30 PM   #16
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If someone ever wants to know if Absurd flow will make big numbers, theres your answer.
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Old 08-25-2009, 02:50 PM   #17
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really nice. i like this one a LOT!
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Old 08-25-2009, 04:29 PM   #18
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they are even worse than in germany here.. my car is highly illegal.. :P

btw.. i know the filter is in a bad spot.. just havent had the time to fix stuff yet..

and even if i have only a few posts on this forum that does not mean i dont know what im doing. so shut the **** up about the noob stuff. or show me your version of a diy turbo kit thats better.. ******* :P

btw.. dynoed 396.6whp. and 440+nm torque at the wheels today on a rototest dyno, even with the sucky filter placement. on gas similar to us 93 octane..

bloody hell the car is fast..
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Old 08-25-2009, 04:55 PM   #19
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sorry this is the best I can do and it's not faster cuz my built motor is still in boxes. the picture is missing COPs and the mazdaspeed triangle brace.



btw, I'm just pullin your noob chain.
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Old 08-25-2009, 06:08 PM   #20
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Nice built , I saw your thread in M.net.

Welcome to a real forum.
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