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Vonlam43

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Posts posted by Vonlam43

    Megasquirt Questions

    in MegaSquirt

    Posted

    I've recently come into some money and am trying to figure which path to take as a megasquirt controller. I've read the manual and only questions several times but to no avail am having trouble trying to figure out what I want to do. For starters I have a L28e that I turbocharged from a 77 280z. The only thing I'm looking to do is controll my fuel and spark and be able to tune properly somewhere in the neighborhood of around 15-18lbs of boost. I'm just trying to figure which version my money will be best spent in and is the most user friendly. I work for CarQuest so oem parts aren't incredibly hard to come by and I have a budget of around 500$-700$ if I can get any input from current users about their systems it would be much appreciated thank you.

    voltage issues

    in Ignition and Electrical

    Posted

    So I Have a 77 280z 2+2 and I've done the zx alternator upgrade it has been working just fine but to start I've gone through 3 alternators and battery's should i try running a jumper from my sense wire to the battery and then check voltage I havent ran any tests yet. :unsure:

    Max Boost

    in Turbo / Supercharger

    Posted · Edited by Vonlam43

    24 degrees locked timing with vacuum advance hooked up full boost at about 2500rpm stock fuel pressure with the afm adjusted. This might be a stupid question but what is an FMU? Forget to mention underboost at any rpm full throttle my afr's are high 10's and low 11's.

    Max Boost

    in Turbo / Supercharger

    Posted

    No its a stage 3 turbine and good to know about the intake eventually I will buy an l28et and do it the proper way but everything is in and running and pulling decent at 5 lbs guess its time to turn up the boost and see were my limitations are.

    Max Boost

    in Turbo / Supercharger

    Posted · Edited by Vonlam43

    A stage 3 cam will not work well with a stock turbine.

     

    A lot of back pressure caused by a restrictive turbine along with a lot of valve overlap is a bad combo.

    I'm sorry I have a fmic setup 2 1/2 inch pipe t3/t4 hybrid turbo and a stage 3 turbo cam with 2 3/4 inch exhaust I think I'm just limited by the stock efi and the cylinder head but any feedback you turbo guys can give me is great and will be taken into consideration. The cam is a regrind and I had it done as close to the stage 3 turbo grind as they could.

    Max Boost

    in Turbo / Supercharger

    Posted

    You are using stock dished pistons, right?

     

    First, I would install a stock P79 or P90 head on your current block. This will lower the compression to 7.4:1 cr and give engine a better turbo cam.

     

    At least put in a stock NA cam. You can turbo charge the stock 8.3:1 cr setup (N42/N47) but ignition timing will need to be lower.

     

    Then find a stock t3 turbo with wastgate, j-pipe, downpipe, exhaust manifold, and turbo oil pan.

     

    What you need for the fuel enrichment for a turbo is called a FMU, you can get one on ebay for $100.00. This little device installs in the return fuel line and will increase fuel pressure only during boost. I would get a 6 or 8:1 fmu, The engine will need around 60 psi of fuel pressure with 7 to 8 psi of boost when using stock NA injectors. 60 psi is about all a stock efi pump will make while providing enough flow.

     

    Then you need to lock the mechanical advance in the distributor and set the timing to 28-30 degrees if you use 7.4:1 cr and stock boost (7-8 psi), or 24 degrees if you use 8.3:1.

     

    The fmu with locked timing makes a decent and cheap low boost turbo setup. But plan in the future to add an aftermarket efi system with ignition timing control.

     

    You can use your current cam if you use a stage 5 T3 turbine, but the engine will not make boost until 3500 to 4000 rpms, and that is no fun in a street car. Change the cam and springs, or just install another head with a stock cam.

    Thanks again for all your help I just got it installed yesterday and working out all the bugs today will give updates on how everything works as soon as its on the road.

    Max Boost

    in Turbo / Supercharger

    Posted

    I shouldn't say stage 3 its a cam i pulled out of my parts car and had it reground it has very minimal overlap. Thank you NewZed that was a great article that really shed some light on my subject right now it looks like the weakest link in my going in setup will be the injectors and fuel pump but it will give me some room to play with and grow.

    Max Boost

    in Turbo / Supercharger

    Posted

    Ok for starters I have a 77 280z 2+2 with n47/n42 combo fresh motor with a stage 3 schneider cam. I have everything to put a turbo on and was wondering what the max amount of boost I would be able to run on the stock injectors with an intercooler. I have been searching for about 2 days now and to no avail havent found anything. Some help would be much appreciated or pointed in the right direction thank you.

    Running Very Rough

    in Trouble Shooting / General Engine

    Posted

    Ok so to start I have a 77 280z 2+2 non california model. The issue I'm having is it is only running on I do believe 4 or 5 cylinders it runs very rough backfires A LOT. I had a procomp ignition in it(very similar to msd 6al). The Ignition failed and the car would not run. So I went back to the way I had it set up before which was a zx distributor swap it now runs but very poorly. If I pull injector clip 2 and 4 there is no change in the way it runs. If I pull the those plugs out I have spark at them but they are soaked with gas.I did an ecu pin test and I dont have 12v at pin #32 which is injector 3. I'm stumped if anyone can help it would be much appreciated because I'm lost do I need to wire up the stock ignition? Please help! :(

    Ignition Tach problems

    in Ignition and Electrical

    Posted

    I know this topic has been beat to death but any help would be nice. For starters I have a 77 280z with an 81zx dizzy swap but here is the catch I took the e12-80 box off of the dizzy so I could wire my magnetic pickup with my after market ignition to it and it runs amazing the only problem I'm having is the tach is not working but for the car to run the yellow wire on my procomp ignition must be wired to the blue wire that sends the ignition pulse to the ecu anyone have any suggestions on this?

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