OMX-596 - 1996 Spec'd NA6 - Updated 21 Apr 2013

[93_Clubman]

Danny, appreciate you have a few projects on the go, & so may not be looking to complicate this one, but have you read about running the TB OEM style with the dummy TB at the back of the SC? Provides better throttle response, but you need to fit a dual port BOV & it's more suited to lower boost kits like the M45. The following is the 11 page thread generated by this topic.

http://forum.miata.net/vb/showthread.php?t=203287

Key pages to get an idea & photos are 5, 7, 9, & 10, but of course there are hints peppered throughout as various forumites experiment.

Coolcatracing starts the thread, but his last 2 posts follow:

I'm intrigued at the number of people who have ventured out and tried this setup. I've done quite a few and continue to tweak the setup a little each time. The stock M45 valve isn't enough in this setup because with the TB in front of it the TB blocks most of the air so the valve really doesn't have to do much. In this setup that metering isn't there so the SC is pumping at full force. And I have always had to use dual action pop off valve/BOV's to make this setup work. Without it the safety pop off feature won't work and the SC will run too much boost and can damage itself.


I use the dual port setup because I haven't seen the need to pipe it back to post MAF. The computer deals with it fine. I found that when I ran a vacuum source to it too it would stay open easier at idle and at part throttle which would cause it to run rich. This is why I just let the bypass valve handle that and let the BOV take care of the boost spikes when shifting. At higher RPM's the bypass valve cannot relieve enough pressure which is why the BOV needs to be there. The optimal setup would be to recirc the BOV and have it also hooked to a vacuum source so it would maintain boost more accurately and the computer would still be happy. The NOPI valve works great and with the slow decline in Greddy quality its really not much worse than the Greddy valve.

[Okibi]

I've seen similar done before too, in one case an electronic throttle body with a pod on the end was used in place of a blow off valve to dump boost.

[93_Clubman]

peoples inventiveness never ceases to amaze me - reminds me of Juffa's old sig about sharing ideas

[orx626]

Danny, appreciate you have a few projects on the go, & so may not be looking to complicate this one, but have you read about running the TB OEM style with the dummy TB at the back of the SC? Provides better throttle response, but you need to fit a dual port BOV & it's more suited to lower boost kits like the M45.

I honestly don't find the throttle response to be any worse than what the BP was with its standard flywheel. I can understand the principles of the modification, but would only invest the time and money if one was to replace the standard inlet manifold with quad throttles (IRTB's).


I got the Innovate LC-1 wideband installed yesterday . Wasted about 3 hours because of incorrect pin out numbering on a plug . The improvement in driveablility was immediate (as it should be). I didn't get a chance to fit the knock sensor and probably won't before the dyno tuning which is booked for the 13th February. BTW, there is a rubber grommet for where the oxygen sensor wire goes through the tunnel .



Cheers,
Danny

[93_Clubman]

As you say if you don't find throttle response to be any worse than a BP with a standard flywheel, then not much point unless you were to replace the standard intake manifold. Look forward to the dyno tuning results.

[orx626]

Small update...replaced the standard AFM which I was using to connect the filter to the intake plumbing with a piece of stainless steel tube. Can't wait to hit the dyno on Friday .

Cheers,
Danny

[Okibi]

It looks like that pipe reduces slightly to accommodate that foam filter, I thought you'd wanna go the other way?

[orx626]

It looks like that pipe reduces slightly to accommodate that foam filter, I thought you'd wanna go the other way?

Actually it increases to accommodate the silicon hose...63.5mm up to 70mm.....I couldn't be stuffed getting a new bit of silicon .

Cheers,
Danny

[Big G]

Which dyno are you going to use Danny?

[orx626]

Which dyno are you going to use Danny?

TAS of course Geoff

[orx626]

Got in and fitted an aftermarket windscreen washer bottle today as there is no way that the standard one will fit with the supercharger inlet and where I fitted the alarm.

Pressed up a bit of 1.6mm stainless steel, 4 holes and 2 nutserts and Bob's your uncle!

Cheers,
Danny

[16bit]

what sort of power are you hoping for? about 130-140wkw?

[orx626]

what sort of power are you hoping for? about 130-140wkw?

Hi James, on 7psi and non-intercooled....it should make 120rwkw. That's what I'm hoping for anyway. This is the best the JR kit will do as it stands. The M45 is at it's rpm limit. The bottom end and mid-range torque is quite impressive. That is the basis of the kit...not a peak hp number.

Cheers,
Danny

[grump]

only 2 more sleeps Danny, will be interested to see what the Dyno says. I must say it is one of the nicest installations I have ever seen, the photos don't do it justice.

[orx626]

only 2 more sleeps Danny, will be interested to see what the Dyno says. I must say it is one of the nicest installations I have ever seen, the photos don't do it justice.

Thanks Grump . Yes, I'm looking forward to Friday...hope that the day doesn't become the "Friday the 13th" !!!

Cheers,
Danny