Jump to content


Photo
- - - - -

New to Ratsun


  • Please log in to reply
76 replies to this topic

#61 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 03 July 2017 - 04:41 PM

Well, looks like the idle was the least of my worries. Took her out for a short drive, gave er the beans a little bit and looked up at the temp gage and it was buried. :( Gonna drain the fluid and check for any oil in it tomorrow.

#62 Bleach

Bleach

    French Administrator

  • User Administrator
  • 6,709 posts
  • Location:Seattle area
  • Cars:280Z and 280ZX turbo

Posted 03 July 2017 - 11:31 PM

so sad. Overheating is one thing, but if the needle is pegged that is not good. I hope you caught it in time before damage.


Thank you Ted!
sig31.jpg
BleachGarage.com - - Datsun Shows in the year 2017 - - Bleach Garage on YOUTUBE
I wished I lived in the golden age; giving it up on the broadway stage
Hang with the Ratsuns, smoke cigars; just have a break with Frank and count the stars

#63 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 08 July 2017 - 12:46 PM

Well, found out why my car overheated.

crap_zpsd7vervna.jpeg

 

Put a new water pump on and Good news is I think everything is fine. For now.  

 

But I took it out for a drive and the acceleration is very rough after about 3000 rpm.  But it only gets rough under load and starts backfiring.  I can rev the car up all day to redline and it sounds perfect.  Maybe a fuel issue?  It has a new fuel filter on it but maybe the injectors need to be cleaned. Ill figure it out eventually but right now I'm just happy it still runs haha.

 



#64 Slowpoke

Slowpoke

    Advanced Member

  • Members
  • PipPipPip
  • 81 posts
  • Location:Detroit
  • Cars:76 280z l28et swap, 87 toyota corola

Posted 10 July 2017 - 05:56 AM

That sucks. Check compression, and check for fluid cross contamination. The heads on these engines like to warp if overheated.

 

If you got a free pass, check out the entire cooling system to be safe.



#65 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 10 July 2017 - 03:28 PM

Well I checked my coolant and it was clean and my oil looked good just dirty Ive read it's supposed to look milky if it has any coolant in it. Also looked for bubbles in my radiator for a Head gasket leak and so far so good. I did figure out the rough acceleration. The hose that goes from the j pipe to the intake was loose so I think it was leaking at higher rpm and more boost. I plugged off both and I got a smooth feeling and sounding acceleration all the way to almost the redline and felt really good. It dropped my idle quite a bit but I'm not messing with it because I will have a different setup with the intercooler this upcoming weekend. I'm going to do a compression test just to make sure but I think she's still alright but it'd be nice to know for sure.

#66 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 26 July 2017 - 06:02 PM

Hey guys,
Well was gonna make a big post how my car was running awesome now even after overheating and now runs cool after I had done all this work too it but I came home today after work because my dad got my car inspected and tags so I can legally drive it. So I guess I'll start in detail of what I've done and what happened and what it's doing now. So I put the intercooler and while I was doing that I adjusted the throttle stop screw to set my idle that way instead of the hanky stuff I had earlier.Ran awesome no boost leaks still rough on the higher rpms. Then I checked timing. At 700 rpm I was almost off the end of the teeth next to the crank pulley that measures degrees. It was basically at 30 degrees advanced so I got it down to 20 at the correct idle rpm. I triple check this so I'm fairly certain it's not a probably anymore. After I got the timing the car revved insanely smooth all the way to redline. Then I installed a boost gage and manual boost controller played with it for a bit and set it to about 8-9 ish psi for now and ran awesome. Today my dad trailered my car to a near by town to get it inspected and get a tag and there was chance of rain so he put a tarp over my hood. I don't know how well he covered it and it poured on my car. He told me the coil got wet. So started the car just fine. Will rev all the way to redline not under load but when I went to drive it legally for the first time right when boost starts to come on if fell on its face and backfired. Now it can't even get into boost and does it every single time. My dad called his mechanic. Told me to check the fuel filter, clean as can be because I had already checked it about a week ago for the rough acceleration. So now I'm at a complete loss on what to do. If anyone has any ideas I'll try anything.

#67 Slowpoke

Slowpoke

    Advanced Member

  • Members
  • PipPipPip
  • 81 posts
  • Location:Detroit
  • Cars:76 280z l28et swap, 87 toyota corola

Posted 27 July 2017 - 05:37 AM

Re-check your work with the intercooler piping, boost gauge and controller. Re-check all of your work. Specs for the coil are in the FSM.

 

Welcome to the Turbo datsun rollercoster ride!



#68 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 27 July 2017 - 08:54 AM

This roller coaster sucks, but expected. I'll try to check that all tonight but it ran awesome after I did all that too it but I'll still re check it all. My dad drained my fuel today and it was a little foggy. Thanks for the suggestions. How likely is it the rain shorted or messed something ip in the afm? I'm not sure exactly how the afm works but as the flap moves it sends signals to the each for longer pulses for the fuel injectors right? Idk I'm just pondering over all the possibilities at work.

#69 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 27 July 2017 - 06:51 PM

If I used the idle stop screw to set my idle and didn't adjust my tps could that be causing the issue. I read threads of people doing it but I've just been thinking about what I changed since the last time I drove it and I saw a thread that said it needs to be adjusted if you set your idle off of the stop screw. But I didn't think anything from the tps would make my car do that?

#70 Slowpoke

Slowpoke

    Advanced Member

  • Members
  • PipPipPip
  • 81 posts
  • Location:Detroit
  • Cars:76 280z l28et swap, 87 toyota corola

Posted 28 July 2017 - 04:31 AM

Start at ignition. Check plugs, wires, dizzy cap, rotor, coil, ignitor, and all associated plugs. Check all vacuum lines, IC piping, intake boot, etc. Continue checking systems in this manner. Go from easiest to the more difficult systems and components.  This method may take a long time but it usually turns up something, and is faster than guess and fiddle.

 

Good luck homie



#71 datzenmike

datzenmike

    KING RAT

  • User Administrator
  • 70,327 posts
  • Location:Vancouver Island
  • Cars:'74 710 sedan, '76 710. prevoius... '78 620, '71 521, '68 510 new '76 B-210

Posted 28 July 2017 - 06:48 AM

Water is not very conductive for only 12 volts, but the high tension voltage from the coil, wires, cap or rotor is a different story. Check clean and dry anything on the high voltage end of the ignition. Remember, the only thing that really changed was it getting wet. Voltage will ALWAYS try to find the easiest shortest path to ground. With good cap, rotor and plug wires this will make the easiest path to ground across the spark plug gap.


Posted Image

#72 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 06 August 2017 - 06:46 PM

Well I made some progress, new coil made the car run a lot better still backfired a little bit but could kinda get into boost.  So I got new spark plug wires and spark plugs. NGK-R's but they really didn't change anything so I kinda took a break and stopped messing with it.  Saturday I got into the car and it ran awesome, out of know where.. so i thought.  Today my dad told me that he banged on my ignitor ( he doesnt know what it is but it also got very wet beings it was on the coil bracket so I guess that was what his primitive brain came up with lol)  but it worked? atleast for that little pull i did in the drive way.  Anyways today it ran a little worse but just like it used to with random misses.  I don't know why him doing that helped because my understanding of the ignitor is basically like a small transformer to hop up the ecu signal for the coil, but whatever it kinda worked but he said  he banged on it because thats what we did with the fuel pump to get it to work haha.  Anyways I got a no name gm 4 pin hei module to replace it because i think thats what causing my problems.  I was following this write up wiring it up.

 

write%20up_zpszhrzdqjm.jpeg

 

So I wired it up just like that but it didn't work.  So I googled it and I didnt know the metal back plate of the ignitor acutally served as another ground so from my findings on forums if that back part isnt grounded then you fry the unit:/  lol i guess its my fault for not researching it more.  Anyways I was wondering if anyone had any other info i should be aware of so i dont ruin another one.  It was only like 20 bucks so its not a hige deal but id like this one to work next time.  Anyways with the knew one as long as i have a good mount for the ground on the back plate it should work?  Was that the only thing I was missing?



#73 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 04 September 2017 - 08:09 AM

Well its been awhile since I updated this because I've been in school but i have the day off today for labor day.  I've made a lot of "discoveries" so far on why my cars not running right and hopefully enough to were someone could help me narrow down the problem.  I went through all of the ignition, converted to the hei module then back to the stock ignitor because it didn't change anything and looked ugly lol but now i have a back up if it ever goes bad.  But when replacing my spark plugs i ran the car a couple of times and pulled out cylinder #2's plug and it looked brand new and didn't smell like gas or anything.  So i grounded out the plug outside of the cylinder and it definitely is sparking.  So I thought that the fuel injector was bad on that cylinder or the plug from the harness itself.  So i swapped the 1 and 2 FI plug and the #2 was sending the pulses to injector 1 and it was firing so i took the fuel rail out to inspect the second fuel injector.  It was pretty clogged up so i clean it up and put it all back in.  Which at that point i thought i fixed the problem... for about 3 days then it went back to running terribly gradually.  Each day it seemed to get worse and I'm back to where i started.  Then messing around with stuff today i took out all the plugs just to see what they looked like and they all were very white/ lean looking.  So I remembered reading about the CHTS and that unplugging it would make it run super rich. So i started the car unplugged it and it definitely runs rich cause i could smell my downpipe during right underneath me.  But i took it out and it ran like a bat out of hell and was awesome haha. But it died after hard acceleration coming down in RPM.  So from what I've been reading this could lead to my AFM possibly has gone bad or the connections itself?  I wouldn't think the CHTS is bad because it would act as if it was unplugged all the time if it was bad right?  Then i also read it could be the TPS sensor and mine is definitely not set right, I tried to adjust it when i used the idle stop screw to set my idle but i couldn't read any continuity between the two pins no matter how i turned it.  Maybe thats not the right way to set it but from my understanding where the blade sits now it should be in contact with the other pin and loses contact when you give it throttle and then it switches to "off Idle".  I don't the the TPS is my problem because i changed the idle to use the screw like 3 weeks before it started running bad.  This is a pretty long post but hopefully the CHTS info might tip one of you guys off on what my problem is that i can't find.  I really want to get it fixed because it ran awesome with it unplugged, such a fun little pull haha.  But if anyone has any ideas I would really appreciate the help! Thanks!



#74 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 04 September 2017 - 05:21 PM

Well I took my AFM back to school today and used our measurements lab DMM to test my AFM.  I found that it passed all the ohm test except one between pin 34 and 33 the specs of the manual say 280-400 ohms and the DMM read a solid 200.  Would the 80 ohms of resistance its lacking in those pins really make the AFM not function? I don't really know what those two pins are doing in relation to the meter but they are out of spec.  I'm going to call msa tomorrow and see about sending mine in to get a reman'd one from them and if they have any advice on the test I took, but I figured i'd ask on here too to see if any of you have any good info, thanks!



#75 Bleach

Bleach

    French Administrator

  • User Administrator
  • 6,709 posts
  • Location:Seattle area
  • Cars:280Z and 280ZX turbo

Posted 12 September 2017 - 11:47 AM

http://www.bleachgar...jectionbook.pdf

 

http://www.bleachgar...Fuel_System.pdf

 

http://www.bleachgar...FuelExhaust.pdf

 

download


Thank you Ted!
sig31.jpg
BleachGarage.com - - Datsun Shows in the year 2017 - - Bleach Garage on YOUTUBE
I wished I lived in the golden age; giving it up on the broadway stage
Hang with the Ratsuns, smoke cigars; just have a break with Frank and count the stars

#76 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 03 October 2017 - 02:52 PM

Thanks, Bleach those really helped.  I finally figured it out and this time for good I think.  Its been running awesome the last few weeks but haven't had much time to update.  The problem was a combination of things but came down to me having the one of the two wires on the throttle position sensor switched, so it never adjusted the idle mixture even when I hadn't messed with the idle stop screw.  I found it from when I was adjusting the TPS I didn't have continuity anywhere in the rotation of the sensor between the two prongs and accidently touched one prong to the other terminal I didn't have a wire running to and the TPS just happened to be rotated in the right position.  So I fixed the plug and consequently my timing was about 10 degrees off from setting it with the TPS hooked up incorrectly. Through my trials and test I found that cylinder 2 and 3 have about 110 psi of compression each I think I have a leaky head gasket so my winter project will be to replace that which wont be a bad deal because I was looking into buying bigger injectors and jacking up the boost anyway. Regardless I'm really happy with it right now and is so fun to drive.  My thread on this kinda sucks now that photobucket pictures don't show up anymore but I splurged and bought a go pro for fun so I might upload something from that on here. 



#77 logan66

logan66

    Newbie

  • Members
  • Pip
  • 41 posts
  • Location:Kansas
  • Cars:2007 Mustang GT, 1977 Datsun 280z

Posted 16 January 2018 - 03:41 PM

Well its been a long time since I've posted on this thread because I lost some interest after photobucket quit working.  However I've made a lot of progress on my car and might try to post more often now.  I ended up pulling the motor back out over my fall and christmas break to change the head gasket and clean up the engine.  As well as repaint the engine bay because master cylinder leaked brake fluid all over the frame rail and destroyed the paint :/ 

YfjrgO.jpg

Once it was out I just rigged up the harness out of the way to respray the engine bay.  I replaced the head gasket to try and improve the compression on cylinders two and three. I was a little nervous to do this on my own beings it was the first time I have ever tore an engine down that far but it was actually very straight forward and simple.  I decided to splurge a little and bought ARP head studs in case I ever try to get crazy with the boost.  But here's a couple of pictures of the motor after I cleaned it up and painted it.  It was a lot of work but it was definately worth it. It looks 1000x better than it did.

 

 

 

 

3WmQ1Y.jpg

 

kf0Vu2.jpgAfter I got the motor back in and running again I put the SVO 370cc injectors I ordered a long time ago on the car.  I decided to wait until after I made sure the motor ran again before changing the AFM and injectors.  I ended up having to tighten the flap 13 teeth which was kind of an average of what I had seen other people adjusting it to for the injectors.  Suprisingly it started up first try! It is pretty rich at idle but the idle isn't too much rougher than before but you have to feather the throttle for about the first 30 seconds of start up which doesn't really bother me.  I wish I would've put these in a long time ago because it doesn't even feel like the same car.  I thought it was pretty quick before but now it spins the tires like crazy.  I had no idea how much of an improvement it would make but it is sooo fun to drive now.  Even just at 10 psi with the bigger injectors it moves.  Right now I have it set to about 12 ish psi and don't really want to mess with it anymore because I have a cheap "home depot" boost controller and its difficult to make precise adjustments.  Soon I will invest in a nicer one.  I really want to get it on a dyno to see what it makes.  Along these lines, does anyone know how far I can safely push the motor with these new injectors?  As well as how much psi the stock turbo can be pushed? I might leave it where it is because it makes me grin from ear to ear but I know myself and I'll probably be pushing it more later on.

Thats all I have done to the motor since my last post but in the first picture you can see body filler where the side molding used to be.  Im slowly fixing the rust and dents but I don't have the patience for the sanding.  I'll get back to it soon.  I also put in a new NRG steering wheel and a dash skin I got from MSA.  The dash didn't fit quite right, but thats probably from my dash warping over the years.  Overall though it made it look much better along with the new wheel.

nGKpL8.jpgI wish I would've updated this a lot earlier because this is an enormous post but hopefully ill post more as i continue my progress.  I don't have too much left before shes done.  Or at least road worthy.  Soon I plan on finishing the body work and getting it painted this spring and address some suspension because the tire gap is disgusting and my flares have been sitting in my bedroom for about 6 months  :rofl: