Venom Cobra Build

[LoBelly]

Congratulations on getting the turbos fitted

Really enjoying the build progress - thanks for keeping up the posts

LoBelly

[Modena]

holy smokes, that thing is quiet! Can't wait to see it go, and boy will it go.

[sevenohms]

Originally Posted by Outwest34au

Do those turbos really suck that much noise out? That sounds kinda quiet or is that a trick of the camera auto level thingy?

they seem to suck out a lot of noise, but the camera was a long way away from the car, and as its a fresh rebuild, didn't want to rev it too hard until its settled in. I'll try and get one from a bit closer, so you can't hear the music, but only the car!

[sevenohms]

06 May 2012 - Cobra.MOV - YouTube

First mini drive last night!!!!!! Whoooo that was fun!

[renovationinnov]

hey nathan just watched the video !!!! your making me jelious
well done to get to this stage hope to see more
ROB

[sevenohms]

I may have taken my frist real drive! Man these things are awesome!

[boxhead]

I hope you tightened the rear wheel nuts.

Either they are loose in the video or you have a bent wheel flange?

[sevenohms]

Originally Posted by boxhead

I hope you tightened the rear wheel nuts.

Either they are loose in the video or you have a bent wheel flange?

Maybe a bent wheel. They were cheap off ebay for rolling around the shed...

[sevenohms]

Update:

A quick update:

I have a 'notchy-ness' in the steering that is caused by the strange Z joint that the Jag Front end uses, probably caused by the angle being a bit large for that style of joint. Can't do anything about the angle so maybe I have to change the joint.

Found the cause to my ABS module not working. Dodgy soldering on my part, all fixed now.

A quick adjustment to the trans cable and the engine and trans came out of limp home mode! Whoo hoo!

Next I ran it up to speed on blocks, changed from first to third, then it started spluttering. A long stratch of the head, and try again, and look down to see the "traction control" light flashing... AH HA!

Consult the wiring diagram, found the wire to turn traction off. Try again and it ran with a beautiful bark! BAAAAARRRP!

So solve the steering issues, and its time for another 'test' drive. In a private property of course!

[Jaydee]

Nice going. Do most of the cobra kit allow you to build with the body of. The harrisons are permenant? Seems, so much easier. I'm trying to psych myself up to have the patience to build one. Good on you. I use to have a gyrocopter with a turbo without a muffler, I find it acts like a muffler. Do you have twin turbos? It's going to make a nice foot heater that close to the panel.
JD

[sevenohms]

Originally Posted by Jaydee

Nice going. Do most of the cobra kit allow you to build with the body of. The harrisons are permenant? Seems, so much easier. I'm trying to psych myself up to have the patience to build one. Good on you. I use to have a gyrocopter with a turbo without a muffler, I find it acts like a muffler. Do you have twin turbos? It's going to make a nice foot heater that close to the panel.
JD

No idea bout the other kits, but I thought most of them were body off.

I thought I was a bit mental with a turbo V8, but a turbo gyro takes the cake! hahaha

I'm probably taking the turbos off. I can't make them work vertically (they smoke excessively) and horizontally I can't make enough space to put them in a location that drains the oil back into the sump correctly.

[sevenohms]

Ive had a bit more time to play with the Cobra the last few days. I bit the bullet and removed the turbos after long contemplation. I dont think I could get them to stop leaking oil into the mufflers. I made a mini pipe to swap for the turbos out and if i can think of a way to stop them leaking them they can go back on..

Sorted out the ABS module comms issue, which also sorted the trans issue (the ZF auto uses speed and throttle position to work out gear position), so took it for a quick spin to see if the module is talking correctly, and if the traction control works correctly...

I can report that the traction control is perfect! As the engine comes on cam, it just slightly steps off line, a hint of torque control, grip returns, and BAM! More POWER! The trans is also really good, almost seemless shifting, worth the headache of wiring and the complication..

The engine note is just great, it is not in limp home, so its putting in full advance of the ignition. Theres a video, if you'd like the link, just PM me, as it may or may not have been legal to test it....

[1uzer]

sorry, i haven't looked through the whole thread but a couple of questions about your turbo setup that could help, potentially.

Does the oil drain have enough fall into the sump? if not then you can use a diff oil/scavenge pump to pump it into the cam covers ,oil filler cap.
Switched from ign acc on and with a timer for 5 to ten seconds after switching off can draw remaining oil from the turbo (also does away with any need for a turbo timer)

Are you running a oil filter inline into the turbo, to suit the feed line? these as well as a low pressure (2psi) check valve can stop oil draining into the turbo once the engine is switched off, assuming you have a length of oil line falling into the turbo.

hopefully something i suggested can keep you on track to over 400kw atw.

see you on the other side....

[rpatton3]

As an unmechanical Yank, you guys are doing "rocket science."

I have enjoyed your discussions.

Russell

[Merv and Sharon]

That sounds like a pretty decent 'small block" you have Russell. Any pics?

[sevenohms]

Hi,

I wrote a big long reply and it disappeared! ARGH!

Basically, the turbos are mounted in a vertical direction for packaging reasons. This meant the oil doesn't drain into the outlet, but into the turbine housing. They were also running a pressure reduction plate, i believe it was 2psi plate. No filter, was going to do this later.

Vertical also has an issue with the turbo compressor outlet and the booster being in the same place. I'm concerned with heat soak into the MC, not impossible but not great.

To mount the turbo horizontally, it would need to be at sump level with the scavenging pump below the lowest point of the sump, and the car. So not great.

Thinking of two M90's or a single M112 superchargers to get me to 400kw.

Nathan

[rpatton3]

Slide Show for album :: Backdraft #874

Here is link to my noisy red car. All I did was write a check;I am jealous of you guys downunder!

[rpatton3]

Slide Show for album :: Backdraft #874

Here is a link to my noisy red car. All I did was write a check; you guys are doing R & D where nobody wrote you a recipe. I am jealous!

[Merv and Sharon]

Beautiful Backdraft and superb motor Russell. What capacity is it?

[1uzer]

I watched the short video of your car running with the turbos mounted like that. Nice layout by the way, and now i can see your predicament.

Can you make a video of a shed skid? i like shed skids, and so do the boys

I've made my own twin turbo kit to suit my cobra, with the turbos in the guards like that too (though flat). To do it I had to use very low profile air filters (hks mushroom filters) with one turbo slightly higher then the guard vent and the other quite low, due to brake booster and mc. i used the same turbos in the genTT kit. Their small exhaust housings REALLY helped make room.

I've got turbo heat bags / beanies over the exhaust housings, earls fireproof sleeve over the brake lines and thick shielding around mc and booster. All exhaust and inlet is wrapped. Oil is scavenged too.
Its tight, and hot, but persistence made it happen

Did you research any other twin kits before deciding on the turbos? genTT kits use visually smaller turbos and make the numbers with very low boost.
there's a set of install instructions on the net and that covers most relevant issues you could face.

also there is a company that has made vertically laid turbos possible, i think it's called aerocharger turbo systems.

I hope it becomes possible. Because they're a rare breed twin turbo cobras