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Buckey's Pro-Am Build: '87 Mazda RX7 TurboII

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Old Mar 10, 2012 | 03:44 PM
  #1351  
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From: Rockford, il
Originally Posted by mannykiller
Bucky... don't let people steer you away from Water/methanol injection... It's the only way to go for anything 380+whp
e85?
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Old Mar 10, 2012 | 04:27 PM
  #1352  
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Originally Posted by Litreocola
e85?
E85 is worth it if it is available in your area(is here) but mainly only if you plan on running well over 400whp. at or below that it isn't worth the headache.

Originally Posted by infinite7z
are meth injection pumps usually that big? that thing is huge! lol
pretty much, the standard Shurflo pump is that size and is what most all WI kits provide.
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Old Mar 10, 2012 | 10:23 PM
  #1353  
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Originally Posted by infinite7z
are meth injection pumps usually that big? that thing is huge! lol
Thats what she said.
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Old Mar 10, 2012 | 10:48 PM
  #1354  
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as far as injection settings go, it depends on your peak target boost level for the start/full settings. start the pump at about 1/3 your target psi and have it turned on full a few psi below your target. try to also keep the turn on point as far away from your fuel injection stage level as possible but still under 10psi. primary/secondary staging usually starts out of boost and ends at a few psi though, depending on your tuner. as an idea i usually set the AI to come on at 7psi and end it at full spray at 15-17psi seems to be the best points.

for injector sizing, depends on the numbers that correlate to your kit. most times i just use the largest they provide as most kits are tailored for piston engines and these engines can handle gobs of AI, but if it proves problematic with ignition break up then you may have to scale the injector size down or plug heat range colder(higher plug #). most kits come with 250/375/550cc nozzles or therabouts.


manually prime the pump without the controller, i have had a few pumps that overloaded and cooked the controllers right out of the box...

installing a kit right now, actually.

Last edited by RotaryEvolution; Mar 10, 2012 at 10:55 PM.
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Old Mar 12, 2012 | 04:17 AM
  #1355  
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got the car together. drove it around my huge *** neighborhood area (kinda rural)
did a few pulls (nothing stupid). parked it. washed the out side. took it around again, beat on it some more to make sure it was cherry.


had a spur of the moment decision to load it up and hit up a udrift session to feel it out since the car felt faster than it's ever been. filled it up with pump 105, spent all the money i had saved up pretty much prepping it/took time off work.

mounted a 4 tires, went to Udrift, and paid $50 to get an hour of driving in.

unloaded the car, drove the course (gripping/following a friend) to learn the layout real fast. did a few pulls trying to pace the lead car. went back, proceeded down the straight

Go to initiate

and car breaks up and now will not accept any throttle input... super rich seeming. checked all the couplers (removed/reinstalled) swapped TPS, neither did anything really unplugged, and plugged in car still ran like ****/wont move (still could be an issue)

the tach frauds out whenever the car breaks up/bogs. pretty much rev up, nothing happens but backfiring, and tach jumping like im on limiter. maybe leading coil issue? really hoping it's not something up with my haltech...

haz no idea wtf is going on with this car anymore. i will post a video tomorrow. getting so burnt it's beyond belief...
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Old Mar 12, 2012 | 07:39 AM
  #1356  
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Originally Posted by driftfcbuckey


and car breaks up and now will not accept any throttle input... super rich seeming. checked all the couplers (removed/reinstalled) swapped TPS, neither did anything really unplugged, and plugged in car still ran like ****/wont move (still could be an issue)

the tach frauds out whenever the car breaks up/bogs. pretty much rev up, nothing happens but backfiring, and tach jumping like im on limiter. maybe leading coil issue? really hoping it's not something up with my haltech...

haz no idea wtf is going on with this car anymore. i will post a video tomorrow. getting so burnt it's beyond belief...
you have a haltech right? Check your ign pickup noise setting.I had a kid who's car did the same thing... It ended up being a bad ground under the dash.

Still could be a bad cas or internal ignitor in the coil... Also, I've watched an old e11 haltech mysteriously cook while the car was just sitting there idling and sounded similar to your problem... Root cause ended up being a bad sensor ground again that burnt the board. I replaced the ign driver with one from digikey and problem went away.


9 out of 10 times it's gonna be something simple... Don't let it beat you up dude!
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Old Mar 12, 2012 | 09:48 AM
  #1357  
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From: Quartz Hill
^ yea at this point you should really just have a check list... especially since you just got the car running. Don't jump to conclusions though...as everyone's had experiences with computers mysteriosly frying.. Check your grounds... and all iginition. ALso.. with water meth..I've realized when not running the correct heat range..would faul out VERY quickly. But the tach jumping just sounds like something may be loose (ground..i'm guessing.) Could also be a combo of both..fauled plugs and a loose ground. I'd check your plugs first though.
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Old Mar 12, 2012 | 09:54 AM
  #1358  
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I agree with what everyone else is saying. Years ago my 3rd gen was acting crazy with bouncing idle and dumping way too much fuel in the motor. After much trial and tribulation it was a a bad ground under the dash screwing with the Power FC and one of the vacuum lines in my rats nest popped off also (I was still running twins at the time). It took like two and a half weekends to find the problems and a whopping 37 seconds to fix them.
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Old Mar 12, 2012 | 12:06 PM
  #1359  
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i'd check the harness first to make sure nothing is grounding out or cooking over by the turbo from the heat.
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Old Mar 12, 2012 | 02:14 PM
  #1360  
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personally i would try a new CAS and un loom the wiring to double check.


get new plugz too mang. and ngk blues
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Old Mar 13, 2012 | 07:35 PM
  #1361  
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stabbed a new CAS in. nothing.

new leading coil and new CAS. nothing.

new leading coil and old CAS. nothing.

new tps and this^. nothing.

new tps, and new coil, and new CAS. nothing.

unplugged map sensor - car wont run. working.

unplugged TPS car runs more lean (a bit better but still no go)

unplugged trailing coil no difference at all.if anything it's better because it will rev.


i still have no idea even though it seems as if the trailing coil is bad, i've swapped one already and same ****... it might have been bad but not likely as it came from a running car i bought a while back.

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Old Mar 13, 2012 | 08:03 PM
  #1362  
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Check injector wiring at the injectors AND the ECU plug...wiggle the wires at the plug while it's running, could be a faulty pin like mine was.
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Old Mar 13, 2012 | 08:28 PM
  #1363  
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easiest to just do a run and take a log of the run(right to when the issue occurs), the figures should give an idea as to what the cause is.
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Old Mar 13, 2012 | 08:36 PM
  #1364  
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He doesnt have a laptop.^
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Old Mar 13, 2012 | 08:36 PM
  #1365  
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Originally Posted by Karack
easiest to just do a run and take a log of the run(right to when the issue occurs), the figures should give an idea as to what the cause is.
i have the serial cable, but no laptop, nor software so im at a stand still
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Old Mar 13, 2012 | 08:41 PM
  #1366  
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Originally Posted by jaggermouth
Check injector wiring at the injectors AND the ECU plug...wiggle the wires at the plug while it's running, could be a faulty pin like mine was.
im going to double check right now. did it once and everything seemed correct, but it was dark, and we were rushing, at the track with hopes to figure something easy and drive.
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Old Mar 13, 2012 | 08:45 PM
  #1367  
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Originally Posted by Karack
easiest to just do a run and take a log of the run(right to when the issue occurs), the figures should give an idea as to what the cause is.
not only that if this counts as a run, then this is all i could do:

this was me trying to roll into throttle gently
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Old Mar 13, 2012 | 08:48 PM
  #1368  
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Buckey, check your Spacebook messages when you get a chance. You can haz my craptop if you pay the shipping.
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Old Mar 14, 2012 | 06:30 PM
  #1369  
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Just coming in here to say it's not the trailing coils. I ran no trailing coils/plugs for years haha.

It's gonna be tough without a laptop. Because through the laptop you can see what everything is doing, and what all the sensors are reading.
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Old Mar 15, 2012 | 04:34 AM
  #1370  
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Originally Posted by nismo_bill
Buckey, check your Spacebook messages when you get a chance. You can haz my craptop if you pay the shipping.
Originally Posted by laramiejoe
Just coming in here to say it's not the trailing coils. I ran no trailing coils/plugs for years haha.

It's gonna be tough without a laptop. Because through the laptop you can see what everything is doing, and what all the sensors are reading.
my friend came over tonight with his laptop. nothing was out of the ordinary (to my knowledge, which isnt much) we didnt drive it around because it was late/lack of a power inverter in the car. ECU seems good. we resistance tested every clip, and pin. both coils are good.


sending my injectors to RC engineering just to make sure neither of the primaries/secondaries are intermittently sticking..

TPS was recording values, but kept saying fault in the percentage portion on the post engine start map. reset the tps, and set it correctly again and it went away for the most part, but then we reset the idle higher because it was idling at 500rpm and didnt reset the tps. the TPS set screw was almost all the way backed out and was reading .5ohms at the connector. really wanting to switch to the haltech TPS after seeing 20% throttle at the pedal is full open on the TPS graph...

think it will pan out. if not im selling everything, doing the E8, and wiring up my racepak, and doing a chassis harness. im hoping i dont have to do this though because this setup was the absolute **** when it worked right before bogging out lately.
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Old Mar 15, 2012 | 06:32 AM
  #1371  
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Why E8? Ps1000 aren't much more. They do use the same software though right?
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Old Mar 15, 2012 | 09:18 AM
  #1372  
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Originally Posted by nismo_bill
Why E8? Ps1000 aren't much more. They do use the same software though right?
Someone messaged me out of the blue saying they have a new one for $500. Ps1k is alot more.
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Old Mar 15, 2012 | 11:53 AM
  #1373  
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easiest to diagnose with a wideband and all the readings. if it's leaning out when it bogs but the injector cycle readings don't change then you will have an idea of where to look. check the injector voltage at the ECU backprobing the wires and see if you're getting a drop in voltage.
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Old Mar 15, 2012 | 12:22 PM
  #1374  
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you can check the injectors yourself brotha... also, i'm sure Karack would be more than willing to help you out for lunch or something. He's a good guy, and one of the most knowleagable guys on this forum when it comes to rotaries.
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Old Mar 15, 2012 | 12:44 PM
  #1375  
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if the car was brought in and a quick look over yeah, just not into doing offsite repairs. always need something i forget at the shop and it takes too long to drive across the valley.
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