Miata Turbo Forum - Boost cars, acquire cats.

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-   DIY Turbo Discussion (https://www.miataturbo.net/diy-turbo-discussion-14/)
-   -   am I crazy for doing this? (https://www.miataturbo.net/diy-turbo-discussion-14/am-i-crazy-doing-16455/)

cardriverx 01-31-2008 10:25 PM

am I crazy for doing this?
 
While I try to figure out my freakin MS, im running my car at 9 to 10lbs of boost with only a fpr and 305cc injectors. Ive been doing this for a few weeks now, no detinotion at all, even full load in 5th gear. a/f is 12.2:1 at the leanest.

Its pretty cool the car is quicker now than when I had the bipes thanks to the lack of retard. Maybe I can do this just cuz its cold here now? Whatever, ill take it. :bowdown:

bryantaylor 01-31-2008 10:42 PM

i was doing the same thing before MS

Savington 01-31-2008 10:42 PM

Something tells me you can't hear the detonation, or you have a big intercooler.

Bryce 01-31-2008 10:50 PM

Watch your oil pressure gauge under a full throttle pull.
What's your AFR curve like? Richest?

cardriverx 01-31-2008 11:00 PM

18x12x3 intercooler, richest a/f under boost is around 11.5, I have done pulls while looking at the oil pressure gauge, no twitching.

a/f curve is like

full boost at 3150 rpm, 12:1

4000rpm 11.7:1

5000 rpm 11.6:1

6000 rpm 11.8:1

7000 rpm 12:1

my fuel pressure hits about 85psi at 4k rpm, then tapers off to about 77 pis, whch would explain the a/f riseing alittle.

Bryce 01-31-2008 11:07 PM

I'm jealous, I have to put up with AFR's in the 9s down low and up top to keep from going too lean in the midrange.

cardriverx 01-31-2008 11:09 PM


Originally Posted by Bryceness (Post 207694)
I'm jealous, I have to put up with AFR's in the 9s down low and up top to keep from going too lean in the midrange.

really? thats odd...

I also get around 14.7:1 while cruiseing with the 305cc's, it works pretty well for me.

Bryce 01-31-2008 11:21 PM

Yeah, I'll post some logs or something in a thread, then ultimately resolve that I just need to ditch the setup and get a megasquirt.

My stock ecu wouldn't cruise at stoich, but it would idle at stoich. I fixed that with emanage.


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