Originally Posted by 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?

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 .

Originally Posted by 28Chevy

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

Nice you've got her more drivable now, can't get over how good those mudguards look, do they wibble about much?

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?

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

yep, decent traction will find the weak spots in the drivetrain mate for sure

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 )

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.

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.

great day out

Yeah! What a great ride out