hwvigo

Ok I think I have found the causes.. 1. The waste-gate is messed, disconnected it and the car runs better. 2. The BOV is leaking when the the line from the intake is hooked up so I need a quality BOV. 3. Even with the waste-gate disconnected the car will not boost more then 8 psi I believe the turbo needs some love. Now on the plus side. 1. Fuel pressure is good but a touch high I believe 37@ idle and will just up to almost 50 while under load. 2. Car is a blast to drive even with with only 8 psi and a auto trans and compressor back feed when I let off the petal it sounds like a HKS ssq 3. I am going to get a the turbo upgraded to a T3T4 by AZ Turbo, and a new Turbosmart internal 10psi wastegate, and a new exhaust and new BOV. 4. I picked up a 5 speed Got the GoPro charging and I am going to shoot some vid later to show how the car is running now.

I have a in line fuel pressure gauge on order should be here this weekend I hope, I am still on the stock regulator, and compression is good but could not hurt to check one more time. just because Datsun, and I am ordering a WbO2 today

Ok I checked the timing, it was 8° off so I set it to 20° initial with car in drive. It made some improvement. The car now boosts better but still falls on its face after 4k it's in boost but makes no power.

No I have not touched the timing, what should it be at?

Could fuel low fuel pressure cause this issue, I noticed yesterday that it seamed to be lean popping, its like it just falls on its face when it gets over 7 psi.

""wastage diaphram assembly thing."" is possibly the best description ever!

It seams I have some checks to make now and I really need a AFR gauge. I will delete the MBC and see what happens, I know The MBC is installed correctly, But we will see what happens.

No OD 3 speed trans but i get what your saying

Wish I could make a 4th gear pull its a AUTO car, the IC has been inspected , I will try removing or clamping off the line to the gate and see what it dose.

1: car is Wot. 2: transmission was just rebuilt 2500 miles ago. Mph and RPM correlate very. 3: I have checked for boost leaks and exhaust leaks and none are present we blow off valve that is currently on there is a knock off but I have a 1gen DSM I have installed and it dose the same. 4: the way state has been tested off the car and opens exactly at 7 psi, and the MBC is installed correctly. 5: intercooler, and charge pipes held 30 psi for 2 hours with no leak down. There is a possibility there could be some damage to the turbo I'm not seeing such as internal failures of the wastegate flap. Couldn't exhaust restriction cause this sort of issue just trying to think outside the box.

After months of trouble shooting and replacing parts my L28et is running better, but now a new issue has reared its head that was not seen before due to other running issues. My car builds boost VERY slow will not hit 10 PSI in tell 5500 rpm. And I was wanting some input for the gurus of the Z world. Any info would be a big help thanks. car info: stock L28et, stock turbo , 2.5'' exhaust with factory 90/90 o2 housing, same side intercooler with BOV and no leaks , DW225 fuel pump , all new connectors on engine harness. and a MBC. and its a AUTO TRANS video of boosting issue.

Its been a while and I have been busy working on the car and driving it. New TPS my old one saw full of water and oil no good, swapped out properly adjusted made a noticeable difference at idle. all new plug for the motor harness, not a hard job and well worth it found many wires that snapped off when I touched them. My and my soldering iron got some quality time. made a some difference in the performance and a huge difference in peace of mind. after all this the car was running good making solid 9-10 psi and pulling hard so it was time to install in intercooler. I could of done the easy thing and bought a kit but were is the fun in that, I got a same side intercooler off ebay that are know to be a good quality product, tossed all the mounting hardware in the trash and made my own brackets the top is just some alu flat stock super simple and the bottom mount is some more flats stock with some 90's on it bolted were the bumper brackets once lived. it all came out just like I wanted it. now for the piping, about as straight forward as you can get one 90 on the cold side and chop the stock J pipe doe the 2" 90 on the hot side. a few unions and step downs and some measuring on were I wanted to put the bov and weld in the bov pipe and it came out just life I wanted. I also made a adapter for a 1gen dsm bov but the spring is a bit strong for now so I am using a Amazon special BOV. all is good other then losing 4psi when I put the intercooler on, is it normal to see a drop in boost when you do this mod? the other issue I am having and it totally random, on start up the car will idle up and down and some times die up to around 1100 rpm then down to 400, if you put it in gear when it is dong this it will die 90% of the time, the other 10% you cant get it going and if you drive it for a 2-5 mins it normalize. you can hear the fuel pump going up and down with the rmp also. any input would be great

Very nice, I regret not getting that one when I did mine radiator. I cheaped out and did a ebay speed daddy one and its ok with my Taurus fan, and also SBC FTW!

Got the pipes done and intercooler install done and it came out dang near perfect.

This is my current setup awaiting the pipes to be made this weekend.

Wild guess TPS should not be filled with oil and water! Guess I'm ordering a new one. Also changed fuel filter. And all lines to 3/8th no change in problem still have not pulled the pump or checked fuel pressure.

The fuel pump is very loud and you can hear it waver when the turn signals are used No AFR gauge have not checked fuel pressure yet need to get a tester Tank no clue - plan on pulling it soon- fullness dose not seam to matter Fuel pump I was told is newish not sure of specs Fuel filter is getting changed this weekend Hoses getting changed this weekend

I Need to get the FSM! I have done plugs and wires and new vac hoses, I also have deleted the carbon canister, and blocked off most emissions stuff.

No clue on the fuel pressure. I need to get a gauge. I will check all that as soon as I can.

my 83 stock L28et has a stumble at idle, dose not want to take throttle under load, will not build boost till high rpm, and will only make 4 PSI . I have verified all injectors are working, all cylinders are firing, I can not find any boost leaks on the stock Jpipe , I have cleaned all electrical connectors and grounds per instruction on http://atlanticz.ca/zclub/techtips/electricalconnections/index.html , and checked all grounds , car is running stock engine management system. The car takes throttle very well at idle but sounds like it had a random miss any help would be very much appreciated. The stumble under load can be heard here at 25-30 secs in to vid very clear. Just a short vid of the issues with the car and showing it taking throttle at idle

my 83 stock L28et has a stumble at idle, dose not want to take throttle under load, will not build boost till high rpm, and will only make 4 PSI . I have verified all injectors are working, all cylinders are firing, I can not find any boost leaks on the stock Jpipe , I have cleaned all electrical connectors and grounds per instruction on http://atlanticz.ca/zclub/techtips/electricalconnections/index.html , and checked all grounds , car is running stock engine management system. The car takes throttle very well at idle but sounds like it had a random miss any help would be very much appreciated. The stumble under load can be heard here at 25-30 secs in to vid very clear. Just a short vid of the issues with the car and showing it taking throttle at idle

car view spectators view

start vid @ 3:20 for the pass strip spectators view

The term ups and downs is all I can use to describe what has been going on with the car. so last post i had got the car running better than it had been much better, so much so I needed to fix the brakes. Well that turned in to a nightmare that took over a month with ordering parts and finding more problems. Found some major rust on the driver floor pan, both front brake caliper hard lines were some home made twist of 10 inches of brake line, and the pass side caliper was frozen, made a new intake pipe for the turbo, got all the new brake stuff installed and bled, installed a boost controller, cleaned up the front suspension, re painted it , under coated the fender wells, repaired the HUGE hole in the front of the drivers floor board. and repaired the front valance and sprayed it red with some dip. All of this to get ready for my dad to come check out the car for the first time, and take it to IFO here in Tulsa and run it in the 1/4 mile. I only get to drive the car once before he comes up and it was ok did not feel great and felt like it had a huge boost leak or something, he shoes up drives the car and is very happy with the way it handles but wishes it had more power. its not even as fast as a NA L28 right now , witch is very disappointing, none the less we spend Saturday (IFO is on Sunday) trying to find and thing wrong with the car i pull the J pipe and check the seals and the intake tube and all vac lines and find nothing wrong. so we give up at 5pm and look fwd to just seeing what the car runs in its slow slow state. Ifo starts at 10am so we decide getting there at 9.15 am we should be able to drive right up and park. Not so lucky there was a huge line and the cars temp started climbing the longer we set. we were 2 cars from paying and parking and the car hits 240F and just dies, so we push it over to the side and let it sit for a while and cool down, jump it and it fires right up 180F and ok but my low rmp missing has come back. we go get the car teched in and go park and enjoy the show till the test and tune racing starts and we make our pass a whopping 17.7 @79 mhp SLOW , we let the car sit for a bit and eat some food and check out some of the nice cars, and let the car rest. I also removed the MBC off the car at his time to see if it made a difference and it did not second pass was a 17.8@ 78 MPH , it was around 1pm and 98F outside so we called it a day and headed home slightly sad with our times and car still felt like it had a boost leak and was missing. So ups and downs, found my boost leak is coming from the stock pop off valve due to me adding boost with out having that blocked off. the miss still eludes me but it could be due to my new intake tube so i will swap the stock one back on and see I also ordered a wiring harness repair kit with all new injector plugs and all other sensor on the motor all of mine have no clips and all the boots are cracked. I hope to make some head way soon any ideas on the miss would be appreciated. all and all I still love this car it is so different from my sbc Z. before after before after during after waiting to get in staging lanes first pass cool down second pass the man that go me in to Z cars

I am glad some one is doing this I just wanted to propose the idea, and see what our community had done and could do.