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Kev's Corrado - Project "Stealthy T"

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Re: Kev's Corrado - Project "Stealthy T"

Post by kevhaywire on Fri Dec 19, 2008 4:21 pm

I think RX8s are only a single rotary, so you'd have to pilfer the injectors from 6 cars Laughing

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Re: Kev's Corrado - Project "Stealthy T"

Post by ctwg60 on Fri Dec 19, 2008 4:31 pm

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Re: Kev's Corrado - Project "Stealthy T"

Post by dirtytorque on Tue Dec 30, 2008 10:31 am

kevhaywire wrote:

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Is that a standard VR throttle cable or a aftermarket job?
It looks quite long.It might suit my needs.

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Re: Kev's Corrado - Project "Stealthy T"

Post by mrbeige on Fri Jan 16, 2009 12:32 pm

Kev, I went out for a drink last night with Sensible (Dave) and Mic and we were discussing VRTs. The discussion came out that it would be quite interesting to collate the data for each evolution of your VRT project. Things like rolling road maps, general driveability etc of yours at each stage of the build. I.e. before and after the big valve head etc etc etc.

Also just out of interest, how long have you managed full throttle, according to the DTA? More than 3.5secs now?

Furthermore, have you fitted all that gear in the above post yet?

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Re: Kev's Corrado - Project "Stealthy T"

Post by kevhaywire on Tue Jan 20, 2009 8:28 am

Blimey, Cambs to Worcester is a bit of a trek for a drink? Very Happy

Yeah it would have been great to keep a journal of all the changes, but I was kind of forced into changing things quickly because it's a daily driver, so didn't have time to dyno all the differences etc!

The original 83.5mm JE engine with GT3071, stock head and cams made 337hp & 315lbft @ 11psi. That was the one and only proper dyno map it's ever had, which was batch and open loop done by Vince.

The current 83mm Wossner engine with GT3582, Schimmel +1mm head and 263 cams made 392hp & 337lbft at the Stealth Rolling road day, in December 2007. That was my own closed loop sequential map.

Minor changes since then aside, you can see that at the same 11psi, the improved head breathing and larger cfm turbo liberated a further 55hp and some more torques. There's more to it than just numbers though, such as the new engine being able to hold the torque to 7K, compared to 5.5K for the old one, where it started falling off quite sharply.

Haven't fitted any of the new stuff yet, apart from the Denso injectors, which are proving to be brilliant. Been using those a month now and the VR6 definitely benefits from modern injectors Very Happy

From now on I'll just be focussing on refining the setup further and making it as reliable as possible Very Happy A 3" exhaust is on the cards providing I can find some quiet silencers. As soon as DTA release the retail version of their DBW controller, I'll be using that aswell. So it's just ticking along nicely at the moment, nothing exciting to report!

LOL, no it's still at less than 4 seconds for time above 75% TPS and 75% RPM Laughing

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Re: Kev's Corrado - Project "Stealthy T"

Post by KipVR on Thu Jan 29, 2009 3:55 am

Seen many of your posts before Kev but I've never seen your car before, Very nice indeed, although I get the feeling it's more of a fast moving test bed. Very Happy
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Re: Kev's Corrado - Project "Stealthy T"

Post by kevhaywire on Mon Feb 02, 2009 2:37 am

Thank you sir. And yep, it certainly is a moving lab Laughing

It'll be coming off the road soon for some Kip style treatment! Was it you that can get hold of that really good exhaust lagging material? I can't remember who was doing a group buy on it but nothing ever came of it that I know of?

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Re: Kev's Corrado - Project "Stealthy T"

Post by KipVR on Mon Feb 02, 2009 6:12 am

PM'd you about it Kev
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Re: Kev's Corrado - Project "Stealthy T"

Post by kevhaywire on Sat Feb 21, 2009 11:44 am

OK, update time I guess!

Car off the road. Forced into it by the discovery of the turbo glowing red which I've never noticed until now, and I check under the bonnet every day!

Anyway, turbo was stripped, checked (looks OK) and reassembled with a new compressor housing.

SPA manifold utterly f'cked and therefore binned.

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Trial fitted ATP mani and turbo, brake pot's gotta go....

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So will relocate it next to the expansion tank, but looking good so far. Will start work on the downpipe next week.

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Need to move the brake servo hose and wiring loom. Most of the loom I can chop out, but will be relocating the servo hose completely with ally hardline to come round the pulley side and bolt into the intake.

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BIG shout to CrazyDave for his fan brackets! There frickin awesome. I sealed the fans on with some rubber draught excluder strip, LOL! Got on there an 11" heavy duty (bigger motor) and a 9" normal.

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Some, erm, 'clearancing' was required on the 9" fan Laughing

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MK4 header tank fitted. Sooooooo much better than the ropey old Corrado one. Very nice click lock cap which doesn't need pliers to remove!!
All you need is a MK4 plug and extend the sensor wires a bit.

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And my final party piece, a most excellent display Laughing

It has loads of screen layout options and will display everything the DTA can output down the serial wire.....TPS, boost, inj duty, inj PW, throttle transients, lambda, AFR, water temp, air temp, you name it, everything!
Can also upload and download maps via the display.
It has a built in USB->RS232 bridge, so to program the ECU, all I do is plug a USB into the display, nice and neat!

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That's it for now Very Happy

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Re: Kev's Corrado - Project "Stealthy T"

Post by dirtytorque on Sat Feb 21, 2009 12:25 pm

very Cool
I'll be interested to see how you make it all fit.I love the"Just make it fit" attitude that i see prevailing in sites like vortex and members on here.I'm trying to adopt it myself.

That display looks great.Designed specifically for DTA then?
I guess you'll have to chalk that zaust manni up to experience. Neutral
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Re: Kev's Corrado - Project "Stealthy T"

Post by CorradoVR6-Turbo on Sat Feb 21, 2009 12:46 pm

do you think the hight ex temps are also a reason for the spa to fail?

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Re: Kev's Corrado - Project "Stealthy T"

Post by kevhaywire on Sun Feb 22, 2009 11:37 am

Who knows, just glad to get the thing off.
Should a turbo manifold crack anyway? I've never seen 1000 deg and most turbo manis I know of can handle that. The Spa is just ****, end of story!

DirtyTorque wrote:I'll be interested to see how you make it all fit.I love the"Just make it fit" attitude that i see prevailing in sites like vortex and members on here.I'm trying to adopt it myself.

You have to really Very Happy If it was a new car I'd get a bolt on kit, but since it's a ropey old rado, a bit of chopping and moving won't hurt it Very Happy

DirtyTorque wrote:That display looks great.Designed specifically for DTA then?

Yep, some chap on the DTA Forum designed and made it all himself from scratch! Clever bloke.

DirtyTorque wrote:I guess you'll have to chalk that zaust manni up to experience.

That's the second one that cracked....in exactly the same place!

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Re: Kev's Corrado - Project "Stealthy T"

Post by KipVR on Sun Feb 22, 2009 11:55 am

Have you got back to them about it, being the second one fail in the same place is clearly a design/manufacture fault surely?
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Re: Kev's Corrado - Project "Stealthy T"

Post by kevhaywire on Mon Feb 23, 2009 2:08 am

Can't do anything about it. They weren't bought from SPA direct.
Certain people in the VRT scene like to pretend there isn't a problem with these manifolds, but I think I've proven there is!

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Re: Kev's Corrado - Project "Stealthy T"

Post by mrbeige on Tue Feb 24, 2009 8:04 am

Does the new manifold position the turbo higher up? It looks that way from the pics. Are you still going to have the filter in the existing position or have you considered putting it in the wing, down where the carbon canister normally sits?

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Re: Kev's Corrado - Project "Stealthy T"

Post by kevhaywire on Wed Feb 25, 2009 3:42 am

It does indeed sit higher up mate, but that's a very good thing because everything on the turbo is so much easier to get to / work on.
I'll be leaving the filter in the same position. From past experience, I don't like mounting filters in the inner wing!

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Re: Kev's Corrado - Project "Stealthy T"

Post by mrbeige on Wed Feb 25, 2009 4:04 am

Is that because of water being inducted there?

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Re: Kev's Corrado - Project "Stealthy T"

Post by dirtytorque on Wed Feb 25, 2009 5:03 am

Bit off topic but is the VR rad larger than its 4 pot cousins?
The one in your photo looks kinda large.
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Re: Kev's Corrado - Project "Stealthy T"

Post by mrbeige on Wed Feb 25, 2009 5:10 am

It is dude, a worthwhile upgrade for any force enduced 4 banger Smile

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The good lady wife's Golf VR
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Re: Kev's Corrado - Project "Stealthy T"

Post by dirtytorque on Wed Feb 25, 2009 5:34 am

I wonder if the rad support if different or something?
I've not heard o anyone doing it b4.WOnder why?!.
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Re: Kev's Corrado - Project "Stealthy T"

Post by mrbeige on Wed Feb 25, 2009 5:42 am

I always thought the supports were the same, but someone told me a while ago they were different. I know that the support has a load of different lug holes for what appear to the correct spacing for the larger VR rad

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The good lady wife's Golf VR
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Re: Kev's Corrado - Project "Stealthy T"

Post by boost panda on Wed Feb 25, 2009 1:03 pm

Looks good Kev!

What's the 45,000 Pascal manifold reading telling me (apart from being just under half a bar - did it in my head don't you know!)

Also sounds like you've had some trouble with crack propogation in hot metal castings?
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Re: Kev's Corrado - Project "Stealthy T"

Post by kevhaywire on Thu Feb 26, 2009 1:39 am

Yeah filters hanging down in the wing get wet and dirty, plus it's a ball ache getting to it to do a simple filter clean!

Yeah VR rad is bigger than the 4 pot's, although I learned when I bought mine from the dealer, they do a smaller one for cold climates, which has the outlets in precisely the right place for forced indcution, but it's too small Mad

Isn't the VR slam panel slightly different to accomodate it? Not sure?

Yep, had trouble with me crack again Mr Monkey, so the manifold, along with it's crack, has been propogated to the bin!

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Re: Kev's Corrado - Project "Stealthy T"

Post by mrbeige on Thu Feb 26, 2009 3:06 am

Furry muff. Didn't thinking about the cleaning thing.

Word on the grapevine is you've got a 24v squirrelled away...talk to me (terry tibbs)??????

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The good lady wife's Golf VR
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Re: Kev's Corrado - Project "Stealthy T"

Post by kevhaywire on Thu Feb 26, 2009 4:01 am

Indeed I have, a nice little 2.8 Very Happy

The reason for going 2.8 over the R32 is for strength mainly. Nice thick bore walls Very Happy

The 2.8 is a very flexible engine too, in terms of rebuilding / upgrading.

As it's basically just a 24V version of the 2.8 12V, bore and stroke are identical (81mm x 90.3mm)

So with pistons alone, you can have:-

81mm - 2792
82mm - 2861
83mm - 2931
84mm - 3003

Or if you start getting the R32 crank involved, you can obviously build your way up to the R32 capacity (84mm x 95.9mm).

The best thing?

R32 crank on the 2.8 with modded stock pistons gives a nice, solid 3.0 engine with thick bore walls for boost Very Happy

That's a long way off though, I'm keeping the 12V for the time being and will gradually build up the 24V over time.

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Re: Kev's Corrado - Project "Stealthy T"

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