Problem solved

After reading some more about accel enrichment and mapDOT etc, i was able to correspond the map de engaging with small fluctuations in the map signal. The map threshold was too sensitive so even tiny changes in the map signal (as small as 1kpa) would engage ae. I set it higher and set decel fuel % to 100 and did some third gear pulls on the way home. Logs show no dips in pw or duty cycle anymore. Hooray!

Thanks for the help as usual Sixshooter.

Rhys

 

Car is set to about .75 bar or there abouts. This video is crap, awful, but it shows the accleration from 20mph +

I have access to a gopro so ill get better ones going on the dyno next weekend

 

I also forgot to add in the screenshot of the log with my lovely linear duty cycle since i fitted the new fuel pump i did some work to my fuel table and was able to reduce lots of fuel up top. so my duty cycle is now at about 75% max or there abouts. I do have some det up at 5k, but ill get it on the dyno soon.



Picked up these today



one is for my buddy! And i got my cop pigtails so ill work on that over the weekend.

 

Pardon my ignorance but those are.... knock sensors?

Been thinking about trying to get at least knock detection working on my Megasquirt.

 

They are dude sorry i shoulda said!! I've heard they can be good but take time to set up properly.

 

Today i had a day at the shed.

First job was to figure out the jobs i have left to do and little projects so i laid everything out on the floor to see what i had.



So the list,,,

Retrofit factory parcel shelf brace
Knock sensor
Brake Stopper
COP conversion loom
Lower control arm replace
Oil pressure sender
bleed clutch
Vband on DP
Metal boost pipes
Battery bracket
adjustable droplinks
catch can
launch control
replace turbo nuts
boost control switch (toggle solenoid/wastegae actuator pressure)
forge engine

There's a few more little jobs i can't remember them

So after i put it all on the floor i had to decide what to do first. So i sey up my welding bench while i decided



I wanted to do some welding (I need a lot of practice) so i went to work on the brake stopper



i added a bit of bracing to it



Cut off what i didnt need



done



Not a major job but i enjoyed it. it passed the time.

Also sorted the launch/flat shift



(Sorry about horizontal video, it wasnt me that video'd it )

-Rhys

 

I made a start on my COP loom,

source https://www.miataturbo.net/useful-sa...writeup-12704/

It's not finished but this is what its gonna look like when it is so i'll upload these while i have the chance









Almost there

 

So i finished the COPS, they look exactly like the pic in the previous post. Im happy with them.

Last night i went on the dyno. First pulls we made 207 whp at .8 bar

After a lot of messing with the boost control solenoid i now have a very steady 1 bar that comes on quite smooth.

I'll let the chart do the talking.





The Yellow line is on the t25 last year when it made 200whp and the green line is last night. 233whp.

I'll post a log screenshot later on and my tune. I forgot my laptop at home today.

Rhys

 

It looks like you were making more pressure earlier last year and now the pressure rise (spool) is much slower. Are you using a different boost control method now?

 

Last year was the T25 and now i have the GT2871?

The yellow line is the t25 and the green is the GT2871

 

The turbo went bang









There seems to be alot of pressure in the head as well. No idea what's going on. Maybe stem seals or the like. Anyway, it's parked for now until i can rebuild it

For now ill drive this



Rhys

 

When you say went bang, do you mean it actually exploded or just started leaking oil all over the place?

 

I mean the oil seals or what i suspect as the oil seals. also there's a lot of play in the shaft. and its making a grinding noise on boost.

 

Rhys, this is disappointing!
I will be in West Cork over the new year and was planning to trash your turbo car.
What about the red one? Will that be working or are you going to break that too

 

Amazing news that youre coming to Cork. Absolutely make sure we get to meet up. That would be awesome. If youre here next year theres a good chance ill have the engine rebuild! Also...the red one is planned as a winter beater so i cant promise anything

 

ok.

So i did an compression test and im showing low compression on one cylinder.

Also i took the turbo apart and in fairness it looks ok apart from this...







So im going to put it back together

For now i took a spare engine off a friend to get my car back on the road











So ill be driving again soon

i also picked these up for my daily mx5



tis all go

 

Was that split rubber line an oil drain for the turbo?

 

I'm embarrassed to say yes.... hence the oil EVERYWHERE

 

Did you know that oil is a solvent for many types of rubber? And that the fuel line is not rated for the temp of the oil draining out of a hot turbo? And that it also will not withstand the radiant heat from the turbine housing?

 

Its the oil drain that abe supplied me. the shitty clip i used to clamp it just ate through it.