Twincharged NB Miata
#81
Last few weeks have been busy with business-trips and family-things.. but yesterday i finally got some time in the workshop..
I have started to fit the supercharger and intercooler bits.. now fiddeling with the IC-piping .. trying to remember how it was i did this last time..
I also realized what it means in sweden when you test-drive too early in the spring (before they sweap up all the gravel on the roads from winter).. so i removed a few pounds of sand/gravel from the car and refitted the inner linings in the wheel wells again..
Here are some unsorted pictures of the progress in the workshop.. (including a mockup of the second bypass valve i might use if i want to squeeze out the last 20-30hp before crossing the reliability threshold)..
Test fitting supercharger..
Intake piping with IAT and BOV
Hello.. piping rouding the front sway bar..
SC pipe and IC pipe joining..
SC-pipe going down..
Mocking up where second bypass would fit..
Bypass Clearance
Another clearance shot..
Signal converter i got in the mail to try to get 3x temps into the MS3-box.. (will hopefully convert the 12v-signals into 5v-signals)..
Fender liners in place..
IC tucked in place.. could possibly hang a little lower.. but worked well last time..
Btw, i also got the parts back from the coating..
This is supposed to help heat management substantially.. coating is said to handle almost 1100C degrees..
I have started to fit the supercharger and intercooler bits.. now fiddeling with the IC-piping .. trying to remember how it was i did this last time..
I also realized what it means in sweden when you test-drive too early in the spring (before they sweap up all the gravel on the roads from winter).. so i removed a few pounds of sand/gravel from the car and refitted the inner linings in the wheel wells again..
Here are some unsorted pictures of the progress in the workshop.. (including a mockup of the second bypass valve i might use if i want to squeeze out the last 20-30hp before crossing the reliability threshold)..
Test fitting supercharger..
Intake piping with IAT and BOV
Hello.. piping rouding the front sway bar..
SC pipe and IC pipe joining..
SC-pipe going down..
Mocking up where second bypass would fit..
Bypass Clearance
Another clearance shot..
Signal converter i got in the mail to try to get 3x temps into the MS3-box.. (will hopefully convert the 12v-signals into 5v-signals)..
Fender liners in place..
IC tucked in place.. could possibly hang a little lower.. but worked well last time..
Btw, i also got the parts back from the coating..
This is supposed to help heat management substantially.. coating is said to handle almost 1100C degrees..
#82
Yesterday we had the first trackday for the season here in Sweden. This was a great shakedown.. the car ran great.. running 150/62.5 pulleys now and set the revlimit to 6500 to not over-rev it too much.. right now just running supercharged .. ironing out the quirks and mapping the vvt-engine for boost.
I did some testing also the other day and tried with vvt "turned off" vs. a nice curve giving some adjustments in the middle range.. the boost went up from 0.46(~6psi) to 0.52 (~8psi) and afr from 12.5 down to 11 .. so simplified it made it less efficient, more resistance, lower afr and possibly lower power (the but-dyno was distracted from focus on road and traffic when mesuring).. setting also to max everywhere except idle.. to find the sweet spot where it no longer gives a higher afr (and lower boost).. I had theories about the potential overlap leaking out the boost, but i find by this simplified test that (looking at how fast it reved through the gear on a flat street) vvt that helps NA application also helps in supercharged application..
lessons from trackday .. feedback from a friend that also test drove:
- Clutch needs some bleeding (i also saw wet slave cylinder) so ordered a new one and will adjust according to FM's guide for their stage2 clutch install (the one i have now)
- Tuning for initial roll-on/roll-off gas and not getting a clonk/bump in the car.. driveability under 3k rpm is well.. lets say a little rough.. i guess still comes from blower + to big tb combo..
- Hooking up the cables and that for my tempsensors so i will get more data to keep track of..
- Changing diff oil to os giken oil to see if the rough engagement of the os giken lsd softens up a little bit..
- Perhaps change oil in the trans .. it is not healthy and making alot of sounds .. also noticable play in the drive train in different gears..
I am weighing if i should do the turbo-install as well and lay on 3-4psi more but on the other hand the car already feels amazing at 6-7psi.. and probably alot safer.. but i am very curious how it would behave.. (this is still an unopened engine)..
I also have alot of other small things to sort out on the car this season..
I did some testing also the other day and tried with vvt "turned off" vs. a nice curve giving some adjustments in the middle range.. the boost went up from 0.46(~6psi) to 0.52 (~8psi) and afr from 12.5 down to 11 .. so simplified it made it less efficient, more resistance, lower afr and possibly lower power (the but-dyno was distracted from focus on road and traffic when mesuring).. setting also to max everywhere except idle.. to find the sweet spot where it no longer gives a higher afr (and lower boost).. I had theories about the potential overlap leaking out the boost, but i find by this simplified test that (looking at how fast it reved through the gear on a flat street) vvt that helps NA application also helps in supercharged application..
lessons from trackday .. feedback from a friend that also test drove:
- Clutch needs some bleeding (i also saw wet slave cylinder) so ordered a new one and will adjust according to FM's guide for their stage2 clutch install (the one i have now)
- Tuning for initial roll-on/roll-off gas and not getting a clonk/bump in the car.. driveability under 3k rpm is well.. lets say a little rough.. i guess still comes from blower + to big tb combo..
- Hooking up the cables and that for my tempsensors so i will get more data to keep track of..
- Changing diff oil to os giken oil to see if the rough engagement of the os giken lsd softens up a little bit..
- Perhaps change oil in the trans .. it is not healthy and making alot of sounds .. also noticable play in the drive train in different gears..
I am weighing if i should do the turbo-install as well and lay on 3-4psi more but on the other hand the car already feels amazing at 6-7psi.. and probably alot safer.. but i am very curious how it would behave.. (this is still an unopened engine)..
I also have alot of other small things to sort out on the car this season..
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