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Author: Subject: mighty twincharged kitten
Irony

posted on 7/3/12 at 10:07 PM Reply With Quote
hats off to you mate - awesome
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froggy

posted on 11/3/12 at 01:12 PM Reply With Quote
i keep coming back to the idea of keeping it as a van and have brought the tub back home to mock up .the advantage of the van is it keeps it a little more hidden and means i can run the car without getting the engine bay soaked if it rains .




the other thing going for it is the rear overhang which athough the same length as the saloon the vertical rear end means i could build some quattro/s1/6r4 style arches .





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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Doug68

posted on 12/3/12 at 07:21 AM Reply With Quote
You have to keep the sign writing!

How'd you not paint everything else in the shed blue also?





Doug. 1TG
Sports Car Builders WA

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froggy

posted on 12/3/12 at 08:35 AM Reply With Quote
I did and have been de -smurfing the place since I finished . Ordered a big roll of plastic mask so I can create a mini booth for the next paint job . Main thing I've learnt is to bag the car underneath as the dust has found its way into the engine bay but it comes off with a wet cloth





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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froggy

posted on 12/3/12 at 06:42 PM Reply With Quote
couldnt help screwing some bits on








[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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froggy

posted on 16/3/12 at 10:19 PM Reply With Quote
Suddenly dawned on me why I keep going back to the van body .



Funnily enough reliant did make a supervan 3 but only put three wheels on it





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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Lebowski

posted on 21/3/12 at 01:25 AM Reply With Quote
That is just awesome
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Lebowski

posted on 21/3/12 at 01:27 AM Reply With Quote
That is just awesome
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dhutch

posted on 23/3/12 at 05:30 PM Reply With Quote
*like*
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froggy

posted on 4/5/12 at 08:00 PM Reply With Quote
got the car up and running a few weeks back with the new layout having the throttle upstream of the supercharger and as expected the surge issue has gone but been replaced by awful throttle repsonse and running on a little as you lift making gearchanges difficult

started out with a 9lb spring in the turbo but was hitting 2 bar at 3500rpm shortly followed by the o/s cv joint exploding so back to the cave for a re think


didnt take long to work out the driveshaft issue . i have a mixture of lobro inner joint and tripode outer joint so the spring pressure that is normally there when you run tripode inner and outer joints wasnt there as the lobro doesnt have any spring tension to keep the shaft in position . i ran these shafts with the twin bke engines with no issues but only 160lb/ft so shoving some more torque allowed the shaft to come out of the tripode enough to burst the cup open

digging around the garage found a pair of 4x4 sierra hubs so cut and re sleeved the shafts

the throttle issue was a bit more puzzling as so little info exists about compound charged cars but i came across an mx5 site in the us that showed a twin throttle system that seemed to make sense so i chopped up the inlet and started again using a pair of 74mm saab 9-3 throttle bodies
so it now has two throttles and any surge is dealt with by two dump valves . the first valve deals with air between the turbo and supercharger throttle and the second dump valve dumps any surge pressure from the supercharger to manifold throttle plus it allows any pressure or heat rise when running in vac with the supercharger byass open to get out plus it allows air in at idle when both throttles are shut .

it works perfectly well now and to prove a point if you hold the s/c throttle open and drive it the violent dump noise and a touch of belt slip can be heard just like it was before .as you crank the car to start with both throttles shut the seal is good enough to suck the silicone elbow by the manifold flat so a touch of throttle is needed to start and build a bit of vac to pull the dump valves open .

with a 7psi spring in the turbo now and a very smooth boost request map in it drives well although im still bottling it at 4500rpm .

the other issue was the water temp which although not particularly high didnt seem to flow very well at idle so i picked up an electric pump and controller and put it by the radiator and fitted the temp probe into the head to get a true temp reading before the thermostat

the rad comes up to temp and stays hot at idle now so should have no more issues and temp seems pretty constant at 90c on the road . having the live data from the ecu shows that cyl head temp goes up to 105c after a boost run but comes back to 90ish within a couple of seconds .





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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MakeEverything

posted on 4/5/12 at 08:38 PM Reply With Quote
Where's the video then? . Looks awesome. I did say about the surge and the dump valve tho.





Kindest Regards,
Richard.

...You can make it foolProof, but youll never make it Idiot Proof!...

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froggy

posted on 4/5/12 at 08:59 PM Reply With Quote
did you ?? where ??





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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froggy

posted on 5/5/12 at 04:20 PM Reply With Quote
bit of headway today ,got the car pc issues sorted and got the symbols (cheers phil) to calibrate the speedo on t5 . had an issue with vac hoses blowing off but easy fix and finally got to push the car up to 6k in third gear .the boost request map is very linear and it hits 1.7 bar at around 3500rpm holding rock solid all the way up with ait peaking at 41c . the supercharger does get very hot so the water /meth spray needs to go on to get the best out of the chargecooler .

its still odd not having any sort of torque rise like im used to with the big turbo,s but pulling uphill in third at 2k it pulls every bit as well as it does on the flat. ive had passengers in to keep an eye on the turbo boost and what happens is once it hits peak boost at around 3500rpm the turbo seems to climb slightly as revs rise to maintain boost and power seems to keep rising with revs .
with boost now under control with the right spring and preload ive been able to keep my foot hard down from 2-6k without breaking traction but the springs are way too soft at the back .





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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froggy

posted on 6/5/12 at 01:58 PM Reply With Quote
http://youtu.be/KzxKP2E2Nrg





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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fha772

posted on 6/5/12 at 03:50 PM Reply With Quote
That's liking and sounding great froggy, will we see it at PPC in the Patk?






http://www.ppcmag.co.uk/forum/viewtopic.php?f=47&t=6743&start=105

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froggy

posted on 6/5/12 at 04:36 PM Reply With Quote
Yep , done 100 miles today and nothing fell off so should make it to Mallory in one piece





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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froggy

posted on 10/5/12 at 09:07 PM Reply With Quote
ok so my experiment wasnt entirely succesfull but it did prove that my intake volume was too large to get decent throttle response and a good idle ops: i took the discharge pipe off the blower and found a couple ot tiny scratches on the back of the rotors which definitely werent there before so there must have been a tiny amount of surge although i couldnt pick it up on the boost gauge rigged up to monitor boost between the throttles .

so following the rules its going the proper route but with the chargecooler built into the inlet manifold


air filter -turbo -bypass valve -throttle body


supercharger bypass goes up into bottom of plenum



supercharger discharge into chargecooler/inlet manifold. the cooler will be sunk into the manifold by a couple of inches and the open end capped off to match the other side but its a shorter path and should work well (where have i heard that before :lol: )

lowered the car a couple of inches have re worked the shock mounts and done some work on the front end to run more caster as the steering doesnt self center very well.





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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froggy

posted on 12/5/12 at 08:49 PM Reply With Quote
Ready for final welding tomorrow and see if it can idle normally

Got to add a couple of holes for the idle valve and a few vac points on the manifold but its gone together pretty easy and for a change the eBay aluminium wasn't covered in that evil stuff that makes it a nightmare to weld to


I did look at the pwr barrel coolers but the one I need is £750 compared to the £74.99 eBay jobbie .





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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froggy

posted on 27/5/12 at 07:29 PM Reply With Quote
Major re thinks after Mallory the main one is the supercharger is now off the car and it's back to pure turbo for the time being

It was in the back of my mind that the holset might be too big to work with the charger . We were hitting 2bar manifold with the holset at 12psi but the fuel map was based on fuel flow to support 500hp and the estimator in the tuning software was showing around 450 hp but afr was mega rich going into the low 10s so pressure v flow is a long way apart and it really needs to run the later t7 trionic management which is maf based . Looks like I need to go with a gt3076r bb unit so the compound is on the shelf while I concentrate on the running gear for a while .

The other issue was the panhard rod flexing under boost and with the beam stripped out it was running a lot of toe in and positive camber on the o/s so spent a day getting it spot on and beefing up the centre to take a pair of triangulated link rods to make it a 6 linked set up

The front hubs which clocked up perfectly turned out to get well out of shape once the wheel was bolted on causing horrendous wheel wobble have gone in the bin with some nice chunky aluminium ones in progress .

Good things are the charge oolong system works well and temps were perfect although I didn't get much track time due to the brake issues . Spring rates are ok at the front but 450lb rears are going on the back and the car will come down another inch once I have massaged the front inner arches to make room for more bump .


To make use of the water meth system the map for the holset is a lot more agressive on the timing side as we have a lot more headroom with the 750cc injectors and the spray to cover any midrange knock from the extra advance . Have to say Im looking forward to the monster boost as we were probably only making around 300hp at Mallory based on what the holset flows at 12psi.

Next on the list is power steering which Isn't an issue at speed but for general hooning about will make catching the slide a lot easier and allow me to run more caster to get some self centering back

The corsa b column seems to be the easiest choice as the rpm and road speed signals are compatible with the Saab so it will be speed sensitive and torque sensing for some quick sideways action .





[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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froggy

posted on 30/6/12 at 04:54 PM Reply With Quote
[quote="froggy"]lots of mods this month , to start with the old hx35 is gone and made a good sum on the bay so the new hx35 hybrid cost £80 plus shipping . to get the best from it the manifold is being converted to split pulde including keepint the sides divided right up to the ext gate valve . after some mocking up im going up to a 44mm gate which has v band fittings and some adjustment for preload to help tuning .

the nissan manifold would be a mare to vut up completely so its being modified keyhole surgery style and the long runner that comes in at 90deg to the collecter has had a tweak to turn the tube ino the collector at a better angle





the corsa b power column is done and makes the car a lot easier to drive especially at low speed .the speed sensitivity works as it should and the weighting can be altered by adjusting caster on the top wishbone til i get some decent self centering but it feels pretty good as it is .
the floating felling from the rear is pretty well resolved now after tieing the lower chassis rails together underneath the car to stop the panhard rod mount from moving but it need a horizontal link on the n/s to triangulate the chassis properly . lifting the front trailing arm mounts up by 50mm has made a differnce to turn in as the back end starts to come round on the brakes rather than load the front into understeer .

the rear mudgaurds dont fit after adding the 20mm wheel spacers so no option but to fit the rear body so its back to cag and spray foam for a while



after smurfing everything i own last time ive got a roll of mask sheet to make a bit of a booth this time .






[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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froggy

posted on 3/7/12 at 06:28 PM Reply With Quote
made some headway on the body ,



getting a bit heavy to lift but i can still get it off on my own

the manifold is coming along nicely

the divider will carry on down the wastegate pipe right up to the valve to stop any flow mixing .

this runner came in at 90deg but now turns in a bit better

internal finish was pretty poor but it was a cheap ebay job

divider in place







[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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sebastiaan

posted on 3/7/12 at 06:36 PM Reply With Quote
I absolutely LOVE this car and the amount of work that has gone into it. Keep it up!
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imp paul

posted on 3/7/12 at 07:39 PM Reply With Quote
i also love it puts a daft smile on my face lol
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froggy

posted on 8/7/12 at 01:41 PM Reply With Quote
must be getting better at prep as it only took 1.5 litres of colour to get some shine this time









[IMG]http://i144.photobucket.com/albums/r187/froggy_0[IMG]

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imp paul

posted on 8/7/12 at 04:48 PM Reply With Quote
yaaaaaaaaayyyyyy well done mate love it lots its getting there its going to be mental its the way to be haha
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