And on his 817th post, he said 'let there be boost' - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-01-2009, 02:05 AM   #1
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Default And on his 817th post, he said 'let there be boost'

And there was boost, and it was good. To the tune of 207whp at 8(?) psi on a Dynapack. (Setup is in my signature)

There's allot of tuning left to do, and I will be pestering all your smart ******* for help. My mechanic builds Spec Miata's but hasn't done much boost tuning, so it was a learning experience all around.

But the important thing is the car runs, It made the 140 mile trip back home without incident, and it's back in my driveway, so I'm a happy fella.

I'm off to Watkins Glen in the morning, but I should have some data logs from the dyno on Monday, and I'll start doing some street tuning next week.

Many thanks to this forum. It made the build allot easier.

C
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Old 10-01-2009, 02:52 AM   #2
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congrats!
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Old 10-01-2009, 03:21 AM   #3
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welcome to the party
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Old 10-01-2009, 08:28 AM   #4
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Congrats! great start and very clean setup. nice hp mark too!
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Old 10-01-2009, 09:32 AM   #5
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Congratulations!
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Old 10-01-2009, 09:34 AM   #6
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Congrats! Is this with a "stock" FM Voodoo? 8 psi?
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Old 10-06-2009, 12:29 PM   #7
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WE WANT PICS!!!! and congrats
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Old 10-06-2009, 12:33 PM   #8
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Congrats. This is on a 1.8 right?
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Old 10-06-2009, 12:37 PM   #9
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Awesome man....great feeling...what the Miata always should have been.
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Old 10-06-2009, 01:09 PM   #10
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Nice numbers, congrats.
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Old 10-06-2009, 02:27 PM   #11
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dang I only hope to make 200+ plus on 8 psi lol Congrats!! Feels good, dosen't it?
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Old 10-06-2009, 04:51 PM   #12
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Quote:
Originally Posted by chriscar View Post
And there was boost, and it was good. To the tune of 207whp at 8(?) psi on a Dynapack. (Setup is in my signature)
C
Crap, if this is 1.6, I'll kill myself.

Chris, you ever run with SCDA in the N.E.? Need more turbo miatas!
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Old 10-06-2009, 04:55 PM   #13
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Originally Posted by webby459 View Post
Crap, if this is 1.6, I'll kill myself.
Don't shoot! It's a 1.8l 95 R Package. Feel better now?

I have not run with SCDA. I'm doing NHMS at the end of the month with COMSCC. And hopefully will be able to do 3 or 4 events next year.

C
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Old 10-06-2009, 04:57 PM   #14
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Awesome. It only took me 10,000 posts.

It amazes me that we can basically re-engineer these cars and they can make a long-distance journey. However, I'm the kind pessimist.
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Old 10-06-2009, 05:01 PM   #15
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Oops - double fist.

C
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Old 10-06-2009, 05:10 PM   #16
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Quote:
Originally Posted by kotomile View Post
Congrats! Is this with a "stock" FM Voodoo? 8 psi?
It's a used GT2560R Voodoo kit, the newer one with the nice silicon intercooler pipes, and a MSPNP, with RX7 550's.

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WE WANT PICS!!!! and congrats
I'll snap some pics eventually. Engine bay needs tidying up.

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Congrats. This is on a 1.8 right?
Yes, bone stock 110k engine.

I drove it home from my mecanics shop on Wednesday, and it's been sitting since then. It's got a bad case of boost creep, wherein it goes right to 5psi, then creeps to about 10 at high rpm. I only went WOT on the highway in 5th, and 5psi is nothing to write home about. I have the new wastegate setup on order from FM. A steady 12psi should transform this thing.

C
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Old 10-06-2009, 09:19 PM   #17
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Quote:
Originally Posted by chriscar View Post
It's got a bad case of boost creep, wherein it goes right to 5psi, then creeps to about 10 at high rpm.
First, relocate the tube feeding the WG from the nipple on the compressor to a new nipple which you'll install somewhere after the intercooler.

If that doesn't work, you may simply be shooting for too little boost relative to your wastegate port.
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Old 10-06-2009, 09:34 PM   #18
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First, relocate the tube feeding the WG from the nipple on the compressor to a new nipple which you'll install somewhere after the intercooler.
Tried that, didn't do much. Also tried fiddlin' with preload, and no matter what we did, the boost would rise with rpm. On the dyno, the boost plot was pretty much a solid 45* rising line.

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If that doesn't work, you may simply be shooting for too little boost relative to your wastegate port.
'Splain me, I don't understand.

When I called Flyin Miata, I was explaining that I had boost creep and was rattling off the particulars of my setup. The tech stopped me, and asked if I had the wastegate with the adjustable rod. When I told him I did, he explained that they've updated the design, because that setup doesn't have enough stroke to open the flapper fully. I'm hoping that's the case, and the new WG & bracket assy will resolve my issue. The parts should be here Friday, so expect either a or a from me by Saturday.

C
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Old 10-06-2009, 09:40 PM   #19
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Quote:
Originally Posted by chriscar View Post
'Splain me, I don't understand.
Well, 8 PSI isn't much on a 2560. The less boost you're trying to achieve, the more gas has to flow out through the wastegate. Some people have found that by porting the wastegate path (much like porting a head) this problem is reduced or eliminated.



Quote:
When I called Flyin Miata, I was explaining that I had boost creep and was rattling off the particulars of my setup. The tech stopped me, and asked if I had the wastegate with the adjustable rod. When I told him I did, he explained that they've updated the design
Sounds entirely plausible. FM would know better than anyone this history on those kits. The practical effect of a too-short stroke on the WG actuator would be indistinguishable from a restrictive wastegate flow path.
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Old 10-06-2009, 09:47 PM   #20
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If that doesn't work, you may simply be shooting for too little boost relative to your wastegate port.
I get it now. The too-short stroke combined with the 6psi can = massive fail. Why they spec'd such a low psi can is beyond me, unless it was to help the 'thrifty' customers running band-aids and no intercoolers.

I want to see my boost gauge go straight to 9 or 10 psi and stay flat. Once that's achieved I'll either try and preload it for 12, or install my Profec.

I'm already signed up for NHMS at the end of the month, and I'm thinking 9psi would be a safe starting point for running the car at the track.

C
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