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Topic Review (Newest First)

  • 20-09-2019, 08:43
    ivanhoew
    Quote Originally Posted by mylesdw View Post
    It's amazing the difference a throttle spring can make to the whole feel of a car, rather like driving a car when it's clean and shiny - it goes so much better!

    Great photos, dare I ask what project next?


    it really does myles , i was driving it thinking this doesn't feel as eager , then remembered i had been experimenting ,and wacked a big heavy spring on there to see how affected tickover , then left it on .

    re projects...i may make a hard top for medusa , or alternatively try and build a coupe like the rr in the sorcerers apprentice .

    Quote Originally Posted by 28Chevy View Post
    Nice you've got her more drivable now, can't get over how good those mudguards look, do they wibble about much?


    no front wibblage at all bernard , the back ones do clang on the exhaust if cornering hard ,and the axle tilts , and also the back one vibrate at some points i think because the wheels are not balanced .the tyres do rub a bit as they grow due to speed ,but it just makes an interesting hissing noise.

    one weird thing is that , when cornering left , the rhs front mudguard catches a little , so i am gradually levering it away from the tyre , it now only does it at higher cornering g's ..so a little more bending required .i think that tyre may be folding over a bit more than the others ,with such a high sidewall and only 28 psi .

    RR
  • 19-09-2019, 21:23
    28Chevy
    Nice you've got her more drivable now, can't get over how good those mudguards look, do they wibble about much?
  • 19-09-2019, 20:27
    mylesdw
    It's amazing the difference a throttle spring can make to the whole feel of a car, rather like driving a car when it's clean and shiny - it goes so much better!

    Great photos, dare I ask what project next?
  • 19-09-2019, 20:18
    ivanhoew
    ello me bucko's !



    Well.... finally got to the point on the dyno where i was not getting anywhere fast ,apart from grating off more and more tyres ..







    i treid putting it in 5th and using low rpm around 2200 and holding it steady state ...this just stripped off my gritting ;(





    and took the roller down to bare metal !




    so my final mass of , pre injection and after inj fitted .... ,graphs , made with the car , are these ..

    BHP ..





    TORQUE ...






    you can see pre inj hovered around the 325 bhp and 360 lbs/ft ,,,,and the injection ones around 350 bhp and 420 lbs/ft ...there is so much spinning going on its safe to say that in reality there is a fair bit more power in there .






    so come last sunday i decided to take my first passenger in the car , and veronica was my first victim , she was very enthusiastic

    We went for a walk at blenhiem palace , and the weather was perfect ,sunny and not too hot ...she videod and took pictures ,


    dash of the car en route..






    and i choose to model my latest gay MTB captain look..








    once at the park we cruised in , ignored the parking arrows , and stuffed the beast on the grass under the trees , v took another load of nice pics for me ...























    walked a few miles . scoffed a bit of snacks , and came back to the car to chat to the interested parties , met some really nice friendly people .

    jumped in the car , and drove off out with the children waving at us ...and off to the 10 miles home ..v's verdict on the drive , "it was amazing , felt like she was in some beautiful racing speedboat" ....NOICE !



    notes on the drive for me are , must take off the heavy throttle return spring, it make the car feel reluctant ...much find a stiffer set of rear cartsprings ,its soft with me in there but with two people its much too soft ...mapping going well , but cold starts have become a prob ,no idea why .

    Yesterday i had to nip 5 miles ,up to the A40 for some stuff , so took medusa , and on the way back tried pushing it a bit harder through the bends ,and using higher rpm's....all i can say is it was brilliant , now the injection is getting closer its driving more like a normal car , flexible and easy to use the power ,you can throw her into a corner.... power on in mid apex , and blast out just using the torque , its got over 300 lbs ft from 1400 rpm to 5600 , and over 400 lbs ft from 2400 to 4400rpm , so ,with a body weight of under a ton , its very easy to drive .


    thanks for reading
    via con dios ..





    Regards
    robert
  • 02-09-2019, 21:55
    mygasser
    yep, decent traction will find the weak spots in the drivetrain mate for sure
  • 02-09-2019, 17:27
    ivanhoew
    good idea Neil....if i want to send parts of my box all over the cave ! (this does not mean i won't do it of course )
  • 02-09-2019, 14:48
    mygasser
    Robert, how wide are the rollers? Have you considered fitting the front wheels on the back as well to make it a dually for more grip? You'd need another pair of wheels or 2 sturdy wooden blocks to hold the front up but that's a minor thing.
    Neil.
  • 02-09-2019, 09:35
    ivanhoew
    WELL , i had a tiny window of opportunity to get the monster onto the dyno last friday .


    i have not been able to set the fuelling very well at higher rpm , basically because its so bloody fast at accelerating ...being under a ton and over 350 lbs ft of trq , and big tall wobbly tyres ,means i keep ploughing into corners way too fast ...or going well over my winnebago 7.50x 16 tyres speed limits , i dont mind going over it on the dyno cos i can always run away.


    so strapped her down ,and did a few minutes working on the low down tickover and below fueling , so it has a lot more low down trq for trickling in traffic , made a little progress ,still too rich , but its hard to hold steady state over 300 lbs ft at below 1500 rpm ...more work to do on that area it kept falling in a big rich hole at higher throttle opening .


    then onto a couple of full throttle runs , with the ecu set on auto tune , so it would set the fuelling for me ,after a fashion .

    now judging by these piccys ...



    30 mph light throttle..







    higher rpm full chat max trq..





    i may have just found the trq limit of my rollers with little narrow tyres and no loading !

    i am not sure if it shows very well ,but there was a churn load of blue smoke coming off the tyres , also you can see the grated tyre rubber being thrown across the cave as my gritted rollers hone down the treads a touch .


    however i did manage to get some readings..



    bhp is now up to 354..







    that's a graph of my best venturi run with the 2 spinning injection runs , and my theoretical max with grip ...i reckon at around 380 bhp.




    then torque at 419 lbs/ft ..







    here i reckon on around 435 lbs/ft max theoretical ..however my 419 is still 58 lbs/ft up on the old fueling system...noice


    inj run number 2 had more ignition advance , 1 degree more made a fair bit of difference .


    now i am aiming for around 13.5:1 air fuel ratio , here you can see the fuelling logs for both runs on both engines ...

    engine 1 , the 3.6 litres ..


    run 1






    run 2







    engine 2, the 4.0 litre..




    run 1





    run 2









    you can see how the autotune has modded the fuelling , sometimes over shooting and going too far the other way ,also i am well over 100% duty cycle with these injectors at this 15 psi fuel pressure ,which is a surprise ...and basically means they are wide open non stop ,hence the leanness in the places at the higher rpms .




    also these power runs where done on a low load so the tyres had a chance to grip ,so the ecu only had a few seconds to adjust the fuelling before it was run over ...so i am pretty impressed the ecu was able to take a car that wouldn't rev ,to one that would , in just a few pre run rev ups .



    also it revved to 6k with little vibration


    i think with better fueling and timing i should reach 400 bhp and 500 lbs/ft ....but maybe nor be able to grip it lol. .... for all i know its there already ...it does explain why a blip of throttle in 3rd at 40 lights up the tyres like a volume control.





    ok ok ,geekness over



    regards
    robert.
  • 01-09-2019, 22:38
    MYTHING
    great day out
  • 31-08-2019, 08:13
    Kustom Jim
    Yeah! What a great ride out
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