Greddy @ 5psi, with EMB. - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-04-2008, 06:20 PM   #1
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Default Greddy @ 5psi, with EMB.

Got the car dyno tuned & tested the other week.
168bhp at the flywheel, 138rwhp, it was a cold, cold day

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Old 01-04-2008, 06:26 PM   #2
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i don't know how reasonable the power is for the setup, but it is more than i am making, nice job
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Old 01-04-2008, 06:27 PM   #3
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not bad for only 5psi. you still running the stock downpipe and exhaust? that will make a huge improvement.

*edit* you boost seems to come on late for such a small turbo... you might want to get a manual boost controller and see if you can pick up some more bottom end.
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Old 01-04-2008, 06:37 PM   #4
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This was a couple weeks ago, with Jackson Racing cat-back & cat replacement pipe, stock/Greddy downpipe ****.
I've since replaced the downpipe & will be going to a "dyno day" with some guys from MX5nutz.com over here in UK, so we shall see what difference the DP makes then.
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Old 01-04-2008, 07:19 PM   #5
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looks typical. looks good
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Old 01-04-2008, 08:24 PM   #6
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Nice !
Did you tighten up that waste gate arm ?
You should be able to get up to 6PSI on the standard Greddy kit.
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Old 01-04-2008, 08:31 PM   #7
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Quote:
Originally Posted by Fergus View Post
Nice !
Did you tighten up that waste gate arm ?
You should be able to get up to 6PSI on the standard Greddy kit.
I may try that when it goes on the dyno.

Is it typical for the wastegate to "rattle"? I think that's what I can hear sometimes, seemed "loose" when i was changing the DP the other day.
Holds boost fine though.
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Old 01-04-2008, 09:31 PM   #8
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Quote:
Originally Posted by jim-NA View Post
I may try that when it goes on the dyno.

Is it typical for the wastegate to "rattle"? I think that's what I can hear sometimes, seemed "loose" when i was changing the DP the other day.
Holds boost fine though.
it shouldn't rattle... mine did the same thing. tightened it down and now I spool 750 rpm sooner and also hit 8 psi instead of 6. the annoying rattle sound is also gone, which is a bonus.
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Old 01-04-2008, 09:47 PM   #9
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Originally Posted by Arkmage View Post
it shouldn't rattle... mine did the same thing. tightened it down and now I spool 750 rpm sooner and also hit 8 psi instead of 6. the annoying rattle sound is also gone, which is a bonus.
Well, I don't want to increase the boost without making other changes first but i would like to cure the annoying rattle. will tightening the actuator arm very slightly help with this?
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Old 01-05-2008, 12:52 AM   #10
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Yes, if that is what is causing the rattle.
But it will go near to 6PSI then
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Old 01-05-2008, 04:30 AM   #11
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Quote:
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Yes, if that is what is causing the rattle.
But it will go near to 6PSI then

In that case I'll put up with a bit of a rattle until i sort out bigger injectors etc etc... thanks for the help guys
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Old 01-05-2008, 09:09 PM   #12
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You don't need bigger injectors until you get near 8PSI !!
Tighten it up until there is no rattle, it'll be fine.
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Old 01-05-2008, 09:14 PM   #13
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Quote:
Originally Posted by Fergus View Post
You don't need bigger injectors until you get near 8PSI !!
Tighten it up until there is no rattle, it'll be fine.
Depends on which system he has for enrichment. The vortech taking the fuel pressure to 78~80 psi and the EMB there to add injection would take care of 6psi easily. However, if he has the "black box" European GReddy enrichment and no fuel pressure increase, it's "iffy".
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Old 01-05-2008, 09:17 PM   #14
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I thought he had the standard kit.
I'm in Euroland and have the standard kit with the blue pressure regulator, standard 1.6 injectors etc.
I've no EMB or BiPeS etc.
My setup is going to change again soon though
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Old 01-05-2008, 09:35 PM   #15
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dude what do you mean holds boost fine towards redline you are running .2 bar that is like 2.94 psi it is hurting your perfomance for sure. Tighten the rod and adjust your fueling etc on the EMB and you will be fine.
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Old 01-06-2008, 12:09 PM   #16
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dude what do you mean holds boost fine towards redline you are running .2 bar that is like 2.94 psi it is hurting your perfomance for sure. Tighten the rod and adjust your fueling etc on the EMB and you will be fine.
??? You mean me? look at the dyno graph, it's holding nearer 5 to 5.5psi.

just i noticed the rattle more after fitting a new downpipe. and yes it is from the wastegate.


btw, I have the blue AFPR and also Emanage
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Old 01-06-2008, 10:44 PM   #17
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Blue(Vortech) AFPR with the 12:1 disc they supply and a stock fuel pump in decent shape, will be good to 6psi. Add some additional injection with the EMB and you have enough fuel for 8psi, so I wouldn't be worried about tightening the wastegate rod.

This is especially true with a wideband in place to monitor your AFR and bring your additional injection in where you need it.

I would expect at 6psi that the only problem would be heat soaking, unless you have an intercooler we don't know about.
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Old 01-07-2008, 05:06 AM   #18
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My bad i mistook your AFR line for boost
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