BlownCorona Posted August 10, 2010 Share Posted August 10, 2010 nice car, feel like sharing the theory on that launch control? i too like useful things that never get used or rather i just like homemade electronics Quote Link to comment Share on other sites More sharing options...
Dusty Posted August 11, 2010 Author Share Posted August 11, 2010 nice car, feel like sharing the theory on that launch control? i too like useful things that never get used or rather i just like homemade electronics useing microcontroller (arduino) it reads rpm from the dissy and if it hits or goes above cutrpm (4500) it cuts the spark wires from the ecu to the coils by relay. cuttime is about 200ms and after that 200ish ms it unpowers the relay so spark can go through again. i also added in so it self adjusts the cut time so it keeps it as close to the desired rpm (cut for to long and rpm will drop below desired, to short and it will not drop the rpm enough) thats why the sound changes in the video. if you want to know more just ask. anyway small update. intake manifold is slowly getting done. its going to look shoddy and perform shoddy but i dont care solong as it doesnt leak. as you can see theres a reason i decided not to become an engineer. Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted August 11, 2010 Share Posted August 11, 2010 One of my old customers has a BPT in his MX5? Unsure if he used the 1600 gearbox or not probably GTX internals into the B8 block, this is the best way to go, use the N/A rods and just get forgend pistons etc. Ideally the 1600 block is the one too boost as they go alot harder than the 18s, ive seen a high comp 1600 running 5 pound and it would dick an 1800 boosting way more. Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 11, 2010 Share Posted August 11, 2010 that rpm limiter is the same theory that i had a while ago, just scared to try it cause i didn't know much about what the effects could be, how much do you reckon it would cost to throw one together? trying to decided if i should have a go, ive got a couple PICAXEs laying around. any reason why they shouldn't be used? im also thinking.. could the same circuit be used to create a kill switch to make it harder to steal? Quote Link to comment Share on other sites More sharing options...
Dusty Posted August 11, 2010 Author Share Posted August 11, 2010 One of my old customers has a BPT in his MX5? Unsure if he used the 1600 gearbox or not probably GTX internals into the B8 block, this is the best way to go, use the N/A rods and just get forgend pistons etc. Ideally the 1600 block is the one too boost as they go alot harder than the 18s, ive seen a high comp 1600 running 5 pound and it would dick an 1800 boosting way more. ok from wikipedia BP The 1,839 cc (1.839 L; 112.2 cu in) BP is a dual-overhead variant of the B8 # 1994-1998 Mazda Familia (Japanese Market) # 1994-1997 Mazda MX-5/Miata (did not have VICS until 1999) BPT Mazda BPT - Turbocharged 1.8L The BPT is a turbocharged and intercooled variant of the BP 1989-1994 Mazda Familia GT-X (Japan) solomiata: Many people have used the less expensive FWD based BP8 motors when doing a performance engine build-up or when they are looking for a replacement engine from junkyards vs a genuine Miata engine talking about bp compared to b6 The 1.8 is the same design and is just as robust as the 1.6. It has the same rods, same oil-cooled pistons, same oil passages, same head design and same crank design Since the 1.8 is really just a stretched 1.6, most everything on the front and back of the motor will interchange between the them. This includes the cam angle sensor, coolant intake pipes, flywheel/clutch assembly, various covers and brackets, cam gears, water pump, and timing belt tensioner, etc. The intake manifold, exhaust manifold, motor mount brackets and camshafts do not interchange because of the bore spacing differences. The 1.8 ‘B’ motor has also seen duty in the 1991-1995 Ford Escort GT/LXE, 1990-99 Mazda Protege, 1991-95 Mercury Tracer LTS and Kia Sephia GS. (FYI, the 90-93 Escort GT and Tracer LTS 1.8 DOHC use the same throttlebody and flowmeter as the 1.6 Miata). There was also a SOHC 1.8 used for a short period in the 1990-93 Protege. that rpm limiter is the same theory that i had a while ago, just scared to try it cause i didn't know much about what the effects could be, how much do you reckon it would cost to throw one together? trying to decided if i should have a go, ive got a couple PICAXEs laying around. any reason why they shouldn't be used?im also thinking.. could the same circuit be used to create a kill switch to make it harder to steal? i already had the controller so it was like $40 in parts magnetic reed switch (to go on the clutch) 2 push switches one for lc and one for shift lights 2 5ms relays and one random relay could defently be used as a kill switch as it did it on mine. when the controller was powered off it was grounding the signal from the dizzy so the ecu didnt think the engine was turning over so no spark. put a relay in between so the controller could fireup. theres two ways of doing it, spark cut or fuel cut. if you have a turbo motor spark cut will help spool the turbo but can create explosions inside the exhaust due to unburnt fuel. fuel cut is safer and is the same thing that is used for rpm/speed cut i used sparkcut cus i wanted to shoot flames =D doesnt work though picaxe should be fine so long as you know how to program it. i used arduino because its piss easy to use and i already had it. ooh and you will need to be able to debug like read the rpm the picaxe is getting so you can work out the math to convert pulsewidth into rpm. Quote Link to comment Share on other sites More sharing options...
Mike-e Posted August 11, 2010 Share Posted August 11, 2010 choice car yo! personally don't like the idea of cutting fuel for rpm limit due to potential detonation issues Quote Link to comment Share on other sites More sharing options...
BlownCorona Posted August 11, 2010 Share Posted August 11, 2010 Sounds like my next rainy day project =D, ever had the guts to try flat shift with your limter? if anyone else is interested i could do a build thread in the other projects for one of these. Quote Link to comment Share on other sites More sharing options...
Dusty Posted August 11, 2010 Author Share Posted August 11, 2010 Sounds like my next rainy day project =D, ever had the guts to try flat shift with your limter? if anyone else is interested i could do a build thread in the other projects for one of these. i havent built it so i could.it gets a lot of interference so if i had it continuously running it would keep cutting randomly. made me stall once trying it. if i could fix the interfarance id defently add it in but im to shit at electronics to know how. its -5 volts key on pulses high if i ground it ecu wont get the pulse when using ma shift lights as soon as i get within 1000 rpm of the rpm the light should turn on at it starts randomly blinking from interfarance -.- Quote Link to comment Share on other sites More sharing options...
ThePog Posted August 11, 2010 Share Posted August 11, 2010 Why dont all Mx5's look like this? Makes me want one. Quote Link to comment Share on other sites More sharing options...
Dusty Posted August 17, 2010 Author Share Posted August 17, 2010 mani progress: its gotten really bowed from welding :/ and got a battery box as i was sick of having the battery flying around. Quote Link to comment Share on other sites More sharing options...
BobbyBreeze Posted August 17, 2010 Share Posted August 17, 2010 Ooohhhwa Dustay Quote Link to comment Share on other sites More sharing options...
karmagedon Posted August 17, 2010 Share Posted August 17, 2010 looking forward to see how this manifold turns out. looking good. Quote Link to comment Share on other sites More sharing options...
Dusty Posted August 19, 2010 Author Share Posted August 19, 2010 got the top on the mani. everything appears airtight hopefully it will be. should clean it up more but i cant be f**ked Quote Link to comment Share on other sites More sharing options...
rot808 Posted August 19, 2010 Share Posted August 19, 2010 do not clean it, leave as is i like this Quote Link to comment Share on other sites More sharing options...
Simon Posted August 19, 2010 Share Posted August 19, 2010 Funny how some do it so right. And others just... Quote Link to comment Share on other sites More sharing options...
Dusty Posted August 19, 2010 Author Share Posted August 19, 2010 do not clean it, leave as isi like this as badass as it would look it would rust inside. pink or some other rand color Funny how some do it so right.And others just... i know its shoddy it just my cheap turbo swap. ill do a really sexy swap and overhaul in a couple of years. but for now cheap is the way to go. Quote Link to comment Share on other sites More sharing options...
UTERUS Posted August 19, 2010 Share Posted August 19, 2010 Don't you dare paint that manifold. I wouldn't bother painting the inside of it, turbo will no doubt give it a nice fine coat of oil anyway. Quote Link to comment Share on other sites More sharing options...
lowlancer Posted August 19, 2010 Share Posted August 19, 2010 Funny how some do it so right.And others just... I think this may be in reference to poor old karmagedon's difficulties, vs you dominating it thus far. Quote Link to comment Share on other sites More sharing options...
Mike-e Posted August 19, 2010 Share Posted August 19, 2010 add more rust to manifold plz Quote Link to comment Share on other sites More sharing options...
Dusty Posted August 20, 2010 Author Share Posted August 20, 2010 ok the rust stays then. im still going to paint the inside though as i dont want it rusting at all. also paint might block off any tiny air holes should have this finished next week and ill start on the exhaust mani. its getting wrapped in heatproof tape. dont convince me otherwise. topmount turbo btw Quote Link to comment Share on other sites More sharing options...
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