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(Post Link) post #1 of 25 Old 02-03-12 Thread Starter
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GTV 3.0 Turbo

I havenít posted about my GTV project in this segment before so here goes.

Basic specks of the current setup in the Yellow GTV.
3.0 motor with 2.5 crank so itís a 2.5 with 7.8 to 1 CR.
Gas flowed head with long duration high lift cams.
Master Power MP GT 37 turbo good for +/- 660hp
Custom outlet manifolds (from the blue GTV).
Oe management fitted with 3.2 injectors. They are actually a bit smaller than 3.0 injectors but respond a lot better to fuel pressure changes.
Additional high flow and pressure fuel pump mounted under the bonnet to assist with the fuel supply.
4 x Subaru 450cc side flow injectors mounted on the boost pipe to supply additional fuel when needed.
Malpassie FPR.
Gotech stand alone management to drive the 4 Subaru injectors.
Custom made 76 exhaust system with two 63mm outlets at the back.
The intercooler from the blue GTV that necessitated a little redesigned of the oe GTV front stiffener.
A oe inlet manifold unfortunately had to return for duty since the large one couldnít fit in the oe place without removing the strut brace.
Powerbrake high performance disks.
Q2 dif with the GTV long leg gearbox.
GTA clutch will probably not cut the mustard
Eibach Koni combination.
GTA front antiroll bar.

The Motor.



Assembly.


Getting the intercooler to fit.






The pipe work.







Exhaust build.





Running at last.


Time for more fuel.






This is where we are at so next week I will be in a position to give more info with the fuel supply upgrade completed.

GTV V6 Turbo, Q2, Eibach, Koni, and lots more
916 2.0 Spider what have I done
Triumph Trophy 1200 to counter the fuel prices.
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Very nice, keep us updated
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That looks awesome well done
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No cam belt covers, isn't that a bit risky? They do look cool when you can see them turning, and at least they're easily inspected.
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I used to run my 155 TS without it's cambelt cover

I can't wait to see some vids mate
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(Post Link) post #6 of 25 Old 02-03-12 Thread Starter
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The bottom front of the motors covered te keep out all flying objects but yes its risky. Maybe I will put them back later but for now while I am playing with cam timing its easier.
And it obviously looks nice.
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O I like it!!!!
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As I've said before man, unreal
 
(Post Link) post #9 of 25 Old 03-03-12 Thread Starter
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Thanks
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Bonkers!
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Interesting idea with the extra injectors, is this common to do? I guess it is like a big arse cold start injector on early L-jet cars. Do you have a better picture of the turbo manifold arrangement, and are you worried about the temperature in there, looks like it may get pretty warm. nice work.
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(Post Link) post #12 of 25 Old 06-03-12 Thread Starter
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Heats not to bad but obviously more than on a standard v6.

Yes the injectors are a lot like the old cold start system apart from the fact that they can shove up to 1.8L additional fuel into the motor at any given minute. If its common practice I do not know but thatís the way we do it since you retain all the advantages of the standard management and when the car start boosting we just ad fuel. The stock management pulls timing perfectly when needed.

We are driving them with a standalone management system so we can set the AFR precise all through the range.

She is currently boosting 1bar but we will have to bring it down since she just looses traction up to 4th gear as soon as she reaches 5000rpm.

We will bring it down to 0.8bar hopefully then she will stop spinning in 3rd and 4th

We are looking at clutch solutions since the GTA clutch will not survive.
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What about the JTD Clutches?

AFAIK Steven from Squadra runs his Bimoto V6 GTV with two JTD Gearboxes (2.4 i think).

uprated ones can handle quite some torgue
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(Post Link) post #14 of 25 Old 06-03-12 Thread Starter
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I am not convinced that the JTD clutch is a lot stronger than the GTA unit but I can be wrong.
We are working on a duel plate system using the JTD pressure plate and two GTA clutch plates.
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Use upgraded friction plates for a 20VT, same as the V6 the stock 20vt clutch however is worse then the GTA one.
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(Post Link) post #16 of 25 Old 07-03-12 Thread Starter
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Getting it in SA is a bit of a problem.
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(Post Link) post #17 of 25 Old 08-03-12 Thread Starter
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The GTV wasted no time with showing me the weakest link in the setup.
The GTA clutch just isn’t up to the task at all.
If I accelerate in 6the gear as soon as the boost reach 1bar the clutch throws its hands in the air and give up.
So until we get a solution for that the boost will be limited to 0.6bar I just hope the clutch can handle that.
The stock 2.5 clutch handles 225kw without a problem so I would like to know what my car currently produce.
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My current clutch also slips in top gear when trying to press on.
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(Post Link) post #19 of 25 Old 08-03-12 Thread Starter
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It’s irritating but I suppose that’s part of the fun.

What clutch are you currently using?

It seems like we are maxing the MAF out as well.
Fortunately that’s easily sorted.

For those of you who wondered the 3.2 (GTA) definitely use smaller injectors than the Euro2 3.0 injectors.
The advantage of the Euro3 injectors is that they are rated to work at 3.5 bar instead of the 3.0 bar of the older injectors.

They also react a lot better to fuel pressure changes than the older units.
A bit of useless information for those of you who are interested.

At least we now have enough fuel to keep two 3.0’s happy
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No idea, all I know is the cover plate is red Clutch will be replaced maybe this weekend with a 6 paddle CG motorsport kit.
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Originally Posted by turbonutters View Post
Itís irritating but I suppose thatís part of the fun.

What clutch are you currently using?

It seems like we are maxing the MAF out as well.
Fortunately thatís easily sorted.

For those of you who wondered the 3.2 (GTA) definitely use smaller injectors than the Euro2 3.0 injectors.
The advantage of the Euro3 injectors is that they are rated to work at 3.5 bar instead of the 3.0 bar of the older injectors.

They also react a lot better to fuel pressure changes than the older units.
A bit of useless information for those of you who are interested.

At least we now have enough fuel to keep two 3.0ís happy
Never useless info that, it's always good to know what is exactly in them
 
(Post Link) post #22 of 25 Old 12-03-12 Thread Starter
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This weekend was a new experience for us.
With 1 bar boost attempting to rip the rubber of the wheels in the lower gear’s and frying the GTA clutch in 6th gear we had to do the unacceptable and lowered the boost to 0.5bar.

At the current boost everything work’s perfectly and getting the power on the tar is no problem at all.

The external waste gate starts bleeding of at 0.2bar and then stabilizes the boost at 0.5bar.
To remedy this we will have to use an electronic boost controller so that we can apply positive pressure to keep the waste gate closed until the desired boost of 0.5bar is reached. This will assist with faster spool up as well.
As soon as this is done we can gradually raise the boost until we get the best balance between traction and power. If I have to guess it will be in the region of 0.7bar.
Anything more than that currently seems to be Dyno Queen Power and not worth while having on the road.
As we progress we will be adding staged boost so that we can optimize boost in low and high gear’s. Probably boosting between 0.5 and 0.7 in 1st and 2nd and then raising the boost for the higher gears.
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Do the GTA clutches last with the 3.7/8 motors? How much more power/torque you guys making?
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(Post Link) post #24 of 25 Old 13-03-12 Thread Starter
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We are using a stock 2.5 clutch on my brothers 156 2.5 turbo pushing 225wkw and 350nm which is probably more than what the average 3.7 develops.

At a bar my GTV probably develop more than 300kw and 400+nm. That’s asking a lot from the GTA clutch
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(Post Link) post #25 of 25 Old 13-03-12 Thread Starter
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The 2.5 and 3.2 (GTA) clutch is basically the same thing. The 3.2’s friction surface extends +/- 5mm to the inside. I suppose the pressure plate could have a bit more tension but it look’s like the same unit apart from the additional mounting points.
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