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Jag V12

Discussion in 'United Kingdom' started by Nickt, Feb 1, 2008.

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  1. topcatproduction

    topcatproduction Rookie

    Apr 9, 2008
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    #151 topcatproduction, Jun 24, 2008
    I guess you must have a solenoid controlled wastegate maybe?! I'd have thought it would be something around the 9.75:1 area but I think I have heard conflicting stats too, does it have HE or pre-HE heads?
    I wonder if I will be able to mount my gearbox on the mill and skim 13mm off the face as it must be easier to get a flat finish... Did you just squeeze a release fork in the bell housing and cut a hole for the slave cylinder? Also theres not much of a spline on the input shaft so just wondering how and what clutch you mated to it and how there was enough shaft to locate in the flywheel!!!
     
  2. topcatproduction

    topcatproduction Rookie

    Apr 9, 2008
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    #152 topcatproduction, Jun 24, 2008
    Oh- and 4.76 air/fuel ratio?!?!?!?!?!?! That looks like fun I just might have to try a megajolt system on the next project.... Does the software come with it and can you plug in for diagnostics when running?
     
  3. Nickt

    Nickt Formula 3

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    #153 Nickt, Jun 24, 2008
    Yeh! Its k'ing brilliant! I am running something called a megastim which emulates the TPS, oxygen and Rpm, coolant and air temps
    You can tweakt the setting until it runs just right, then move the ECU to the car plug it in, calibrate TPS etc.. and start. Plug laptop in as yuo drive and select autotune (i think)
    The ECU has built in MAP so its quite straight forward to get going (in principle).
    I used an audi hydralic clutch forks and cylinder, everything was there to fit it onto.
     
  4. DKHudson

    DKHudson Formula Junior

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    #154 DKHudson, Jun 24, 2008
    TOPCAT

    I thought the Porsche 944 was a rear transaxle gearbox? If so, wouldn't you just need a short drive shaft made to link engine to gearbox, but you'd wind up with a very long power train.

    If going mid-engined I know some high power kits/specials use a 911 gearbox. You have to reverse the breather and sump plugs in the gearbox, then roll it over on its back so that the differential is the other way up and the output shaft rotation is suited to mid-mounting. Apparently this is fine for the gearbox operation, as it actually started life as a mid-engine gearbox and Porsche rolled it upside down for use in the 911! So you'd only be putting back the right way up.

    Other option often coupled to Rover V8 was the Renault 21 turbo FWD gearbox, if you can still find one. Spacer plates are available for that set up if you go through kit car magazines.


    David
     
  5. Nickt

    Nickt Formula 3

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    #155 Nickt, Jun 24, 2008
    The Renault 25 UN1 gearboxes are really dear, but the gearbox from the renault espace is the same and normally reasonably priced. You need to be careful as the fuego V6 tubo version spins the other way round. As far as Audi boxes go, 012x, 013x 014x types will do the same as porsche 924/944.
    So I am told!
     
  6. topcatproduction

    topcatproduction Rookie

    Apr 9, 2008
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    #156 topcatproduction, Jun 25, 2008
    Bugger. Just looked back and for some reason I thought you had used a Porsche 'box Nick! There seems to be plenty of Audi ones about so will pounce on one and go from there!! Unless a renault espace one would be better?!

    Again- one step foreward two steps back!!!
     
  7. topcatproduction

    topcatproduction Rookie

    Apr 9, 2008
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    #157 topcatproduction, Jul 2, 2008
    Just thinking Nick- would you be better off with the same gearbox out of a diesel audi to get higher gearing? As they only rev half as high but do the same top speed it may be better for your super beast as it shouldnt need low gearing to be able to pull away in a hurry and the V12 will only rev to about 6000rpm which isnt that much more than a diesel....
     
  8. Nickt

    Nickt Formula 3

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    #158 Nickt, Jul 2, 2008
    Possibly! Mine is off a 16 1990-1994 diesel I think, I know its the same model as the 924 box 012x xx Which is quite a good box, If it blows then I'll take that one step at a time.

    Having great problems getting the engine started, Changed the injectors to earlier Green top at 400 cc/min which are low impedance ones, this means the ECU is struggling to fire all 12.
    The timing is proving a nightmare which has been traced back to my crankshaft pulley having rotated on the front splines! This is dues to rain water getting in the front of the pulley and rotting away the woodruff key. This means that No1 cylinder TDC is now no longer on the right hand bank, it has moved to the left hand bank.

    Sanity check

    No 1A TDC is (standing in front of the car/engine) on the right hand bank?

    This is what i am going by and what the jag service manual says. If that is true then the pulley has rotated 45 degrees.

    So I set the TDC 1A right hand bank with a gauge and set the ignition up that way. Still wont start, used a gallon of fuel so far, most of it poured out of the exhaust ports.
     
  9. 2NA

    2NA F1 World Champ
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    #159 2NA, Jul 2, 2008
    Nick,

    Right & left are determined sitting in the drivers seat. The side with the oil filler cap is the "B" bank.
     
  10. Nickt

    Nickt Formula 3

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    #160 Nickt, Jul 2, 2008
    Last edited by a moderator: Sep 7, 2017
    Tim
    Not to appear too blunt :D Are you absolutely sure? This is from the Leyland service manual on which i have based everything,
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  11. 2NA

    2NA F1 World Champ
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    #161 2NA, Jul 2, 2008
    Last edited by a moderator: Sep 7, 2017
    Sorry Nick, don't believe everything you read.

    This is from the Series III Etype Workshop Manual (basically the same engine) also published by British Leyland.

    This is how it works, been down this road before.
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  12. Nickt

    Nickt Formula 3

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    #162 Nickt, Jul 2, 2008
    Thanks Tim, do you have a picture with cylinder numbers on? Its no wonder they went under!
     
  13. 2NA

    2NA F1 World Champ
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    #163 2NA, Jul 2, 2008
    No picture that I can find however the stock spark plug wires are numbered. If you have another Jag nearby that should agree.

    Think of it this way, your cars in England are "right-hand drive". Which side is the steering wheel? This is typically how the sides of a car are identified (still struggling with "near side" and "off side").

    There are some exceptions of course (Lamborghini Diablo has right and left reversed).
     
  14. Nickt

    Nickt Formula 3

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    #164 Nickt, Jul 3, 2008
    At last it happened, I got the V12 running tonight, ran as sweet as a nut, then it ran out of petrol :eek:

    Sounded awesome :D It has no exhaust and the fumes half killed me, but what the heck! Hopefully this weekend I can "drive" it out of the garage
     
  15. 2NA

    2NA F1 World Champ
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    #165 2NA, Jul 3, 2008
    Good Job.
     
  16. topcatproduction

    topcatproduction Rookie

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    #166 topcatproduction, Jul 4, 2008
    Fancy popping a little video on youtube for us to see?!?!
     
  17. Nickt

    Nickt Formula 3

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    #167 Nickt, Jul 4, 2008
  18. topcatproduction

    topcatproduction Rookie

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    #168 topcatproduction, Jul 5, 2008
    Nice! Planning on keeping no exhausts?!?! You sure those two turbo's are going to be big enough? Too small and they will restrict flow in both directions... too big = lots of lag- then a pair of burnt out tyres- my favorite by far!!!
     
  19. Nickt

    Nickt Formula 3

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    #169 Nickt, Jul 5, 2008
    Last edited by a moderator: Sep 7, 2017
    The turbos are off a par of Nissan 200sx, according to Garrett's website these GT28s are good for up to 2.5l and 360 bhp each! I'm losing the exhaust manfolds. The idea is to block off the two throttle bodies and move the flp assemblies to the ends of the plenums.

    2 * 3" tubes (green will replace the cast manifold sticking straight out the back of the engine, they will go into a turbo, the compressor witll squirt striaght out into the newly opened up plenum end :eek: again with 3@ tube (I have bought 7m of the stuff so need to use it up!
    The output of teh turbos will then be passed through a Ferrari Mondial backbox.

    Appologies for the really bad picture; but I have checked it all out and it fits. The area of the input of the turbos is the same as a 2 1/2 tube, so actually bigger than the stock V12 exhaust. These are fast spooling units so there will be very little lag. I am hoping to get 500 - 600 bhp. I have been told if the engine can take it 1.5 bar boost will give nearly 700 bhp but that scarey. (9:1 cr engine)
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  20. topcatproduction

    topcatproduction Rookie

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    #170 topcatproduction, Jul 9, 2008
    Last edited by a moderator: Sep 7, 2017
    You dont think that modifying the stock exhaust manifolds would give better and more even flow? Was also thinking a similar thing with the inlet side- the ally manifolds are made to flow from the middle out as the main chamber is a lot bigger in the middle than at the ends! Maybe something like this for the exhaust? One or the other...

    p.s. where are the intercoolers going to go?!?!?!?!
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  21. Nickt

    Nickt Formula 3

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    #171 Nickt, Jul 9, 2008
    I did think about your idea for the turbos, BUT the chassis side rails mean that the turbos will hang so low its going to make draining the oil quite tough. I understand that manifold "flow" characteristics when using a turbo(s) are not important as you are looking for turbulence rather than smoothness.
    Agree with the rear inlets to the inlet manifolds though, tried it out, way too small.
    Not going to use intercoolers for the 1st take, but my design does allow them to fit in if I choose to.
    The steel turned up today :) That stuff has rocketed in price since I started this project!
     
  22. topcatproduction

    topcatproduction Rookie

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    #172 topcatproduction, Jul 10, 2008
    Yes I hadnt thought about the turbulence benefit! Though you still want a smooth exhaust flow to get rid of them asap..! Then a 6" exhaust pipe from the turbo's should do nicely ;-) !!!

    Tell me about it, we get a good few tonnes of steel through each week and we have price rises every 2-4 weeks now, has gone up approx 20% since last year and our red diesel for plant has nearly doubled now.... Best to ignore the prices though and keep burning petrol in mad motors!!!
     
  23. topcatproduction

    topcatproduction Rookie

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    #173 topcatproduction, Jul 10, 2008
    ps a couple of small intercoolers will make a massive difference to the power- air is ridiculously hot after going through a charger otherwise- unless you spray a little nitrous in there first to keep things cool.....!
     
  24. Nickt

    Nickt Formula 3

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    #174 Nickt, Jul 10, 2008
    I've used 3" steel tube for the manifolds, 1 1/2" from the head to a 3" collector then out to the turbo flange. Made one side today, finish it tomorrow hopefully (wife and weather permitting). Then I am fitting the coolant pipes that got from one end to the other then I drive/push it out of the garage, turn it round and do the final manifold. I can't do it as the car is as there is no room to work.
    I can't get to grips with my new MMA welder, son of a ***** to use, blew so many holes straight through 10mm steel plate!

    The fuel cells turned up today. awesome, except customs charged me another £30 :(
    I'll take some picture tomorrow.
     
  25. Nickt

    Nickt Formula 3

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    #175 Nickt, Jul 11, 2008
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