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Old 02-16-2009, 01:58 PM   #1
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Default Megasquirt on a 1.6 SC

Hi Guys,
Is anyone running a Megasquirt on their 1.6 JRSC setup? I'm currenetly running a Jackson rising rate FRP, but my car is running out of fuel at around 7psi and 4000rpm...and I was thinking that rather than adding more fuel pressure, perhaps I could fix the problems with a little better control...

Any thoughts are appreciated.
Thanks!
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Old 02-16-2009, 02:45 PM   #2
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Megasquirt would be a good idea. It will allow you to run bigger injectors too. Plus you can use it later on when you ditch that SC crap and get a turbo setup.
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Old 02-20-2009, 01:03 AM   #3
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You should search miata.net for some posts by people using the 45 with a Link to see what kind of gains they've achieved. Don't think I've read about many people using the MS with a 45.
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Old 02-20-2009, 01:19 AM   #4
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I just got a MS on my JRSC car and its defiantly worth it. Im running about 7.5psi of boost and with a powercard setup was seeing 13 afr in full boost before. Now i have bigger injectors and am able to get lower afrs and it pulls much better. Also you can removing the afm which will help a bit too. Going from the FRP to the MS will be a better improvement than what i got.
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Old 02-20-2009, 09:06 AM   #5
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Thanks guys, that's what I thought...good, so I am on the right track. I'm looking for drivability not power to start with...but having the potential for unlimited tuning is also nice.

patsmx5: I noticed you're running an MS2...and almost everyone else is running an MS1...can you enlighten me a little as to why you chose that? I've done a lot of reading and from what I can tell, it would seem the most common deciding point is complexity....

...and yes, at some point I think I just might swap the belt driven supercharger for an exhaust driven one...
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Old 02-20-2009, 09:29 AM   #6
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Hmmm. You could just throw in 1.8L injectors. A $40 fix.

Your going to have to larger than 1.6L injectors anyway.

But once you start going over 9psi. You need more management anyway.

Good Luck!
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Old 02-20-2009, 09:53 AM   #7
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Interesting suggestion...at least a stop gap fix...

Do you know if the stock 1.6 ECU will idle the 1.8 injectors?
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Old 02-20-2009, 11:52 AM   #8
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Quote:
Originally Posted by zoomzoom365 View Post
Interesting suggestion...at least a stop gap fix...

Do you know if the stock 1.6 ECU will idle the 1.8 injectors?
Yes, it will idle even larger like 305 descent and 330 kinda flooding.

But after 1.8L injectors the car starts to drink gas. Is what I have heard. Corkey Bell said you can adjust the afm some for the larger injectors.

But no matter what form of management you use the 1.6L injectors will only flow 6-7 psi.

The 1.8L will work from 8-9 according to you setup. If you have a very free flowing setup. You can probably only get 8psi. But you need headers, high flow or no cat, & exhaust.

But if you are not upgrading and just planning on running 7 1/2 psi. I would just get 1,8L injectors.

For more info on injectors, read the "All your turbo questions in one" Stickey under DIY SECTION.

Good LUCK!.
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Old 02-20-2009, 11:58 AM   #9
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Quote:
Originally Posted by zoomzoom365 View Post
Thanks guys, that's what I thought...good, so I am on the right track. I'm looking for drivability not power to start with...but having the potential for unlimited tuning is also nice.

patsmx5: I noticed you're running an MS2...and almost everyone else is running an MS1...can you enlighten me a little as to why you chose that? I've done a lot of reading and from what I can tell, it would seem the most common deciding point is complexity....

...and yes, at some point I think I just might swap the belt driven supercharger for an exhaust driven one...
I have a 99', and the 99+ crew use MS2E as it supports using the factory ignition inputs as opposed to retrofitting an older CAS input which cost more, doesn't work as well, and is less reliable. Plus MS2 is better in many little ways.
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Old 02-20-2009, 12:22 PM   #10
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Quote:
Originally Posted by patsmx5 View Post
I have a 99', and the 99+ crew use MS2E as it supports using the factory ignition inputs as opposed to retrofitting an older CAS input which cost more, doesn't work as well, and is less reliable. Plus MS2 is better in many little ways.
The 99 is different to our cars. It would be easier to use the MS1 on your car. I think it would be a nightmare for the 90-93, mabe not possible. But I'm sure someone could change alot around and do it.

But the MS1 is more capable than I plan on using. And that is what DIYAutotune uses for our cars.

As far as injectors go, sooner or later adding pressure will lock up your 1.6L injectors.
You should be fine with the 1.8L injectors.
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Old 02-20-2009, 12:32 PM   #11
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When you change your injectors, no matter what size. Don't forget to oil the O Rings. They have a tendency to rip durring installation and leak fuel everywhere.
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Old 02-21-2009, 09:32 AM   #12
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Toddcod: You think I can get more supercharger boost with a free flowing exhaust? I'm not sure I understand how that works...
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Old 02-21-2009, 10:47 PM   #13
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Quote:
Originally Posted by zoomzoom365 View Post
Toddcod: You think I can get more supercharger boost with a free flowing exhaust? I'm not sure I understand how that works...
If anything it might would lower it for the minimizing some restriction. But it would free up some horsepower.

There is alot more to it than just psi.
I'm referring to how much hp the injectors will support. There have been a few people people claim that the 1.8L injectors ran out of fuel at 9psi with the M45. But they had their cars modded out. Or maybe had a stock fuel pump.
I personally think that The 1.8L would probably be fine with the right fuel pump at 9psi, with exhaust for the M45. It might be close though. You would need a Wideband O2 to be for sure.
But they would defiantly support the horsepower you will be pushing at 7-8 psi.

Last edited by Toddcod; 02-21-2009 at 11:00 PM.
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Old 02-22-2009, 11:54 AM   #14
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Ok...that's what I was thinking too...less restriction on that side will (potentially) lower boost...or conversely something lke a plugged cat may cause an interesting increase in boost and corresponding drop in power!

I understand that there is a lot more to forced induction than just psi (VE comes to mind)!

Are you running a stock fuel pump on your setup(s)?
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Old 02-23-2009, 09:18 PM   #15
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Quote:
Originally Posted by zoomzoom365 View Post
Ok...that's what I was thinking too...less restriction on that side will (potentially) lower boost...or conversely something lke a plugged cat may cause an interesting increase in boost and corresponding drop in power!

I understand that there is a lot more to forced induction than just psi (VE comes to mind)!

Are you running a stock fuel pump on your setup(s)?
My bother has a high pressure fp on his. The other cars we are unsure, but they are running low boost.
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Old 03-15-2009, 10:16 PM   #16
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Quote:
Originally Posted by JTod View Post
You should search miata.net for some posts by people using the 45 with a Link to see what kind of gains they've achieved. Don't think I've read about many people using the MS with a 45.
I installed a pnpMS on my m45 setup this last week. Not running quite right but still learning the software before I start tuning it. I think it's gonna work pretty damn welll.
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Old 03-26-2009, 02:55 AM   #17
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do you think that you could switch to 1.8 injectors and an rx-7 afm and still pull decent afrs?
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Old 03-26-2009, 09:55 AM   #18
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Interesting question...I'm not sure how the RX-7 would change AFR's...but I do have a set of 1.8 injectors kicking around...
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Old 04-01-2009, 01:20 AM   #19
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Missed this thread earlier, but I tuned a mspnp on a 1994 1.8 M45 jackson kit. We haven't had it back at the dyno yet, but with a 224,000 mile motor on 8psi, crappy p-p-p-p-powercard!!!!! Header, high flow cat, catback, put down 160rwhp. I expect with MS and its current tune along with WMI around 170rwhp, maybe a slight bit more... It'll pull a bone stock 2004 Mazdaspeed MX5, and does pretty good against my Mazdaspeed6 too!
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Old 04-01-2009, 09:26 AM   #20
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I'm trying to get a friend to put MS on his 1.8 with an mp45 but he thinks "that's too much money for 20whp." He doesn't understand what he's missing in drivability and awesome curveness.
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