pvr 24v

Is it the same with a 12v 3,0 or will the manifolds fitt? and point in the right direction (back of the engien).

No, the 24v heads are completely different, 6 exhaust ports instead of 3, and the inlet manifold will not fit either.

[stephendell]

You can fit a 12V 3.0 if you use the A610 inlet manifold. Exhaust manifolds are OK.

For the 24V you would have to fabricate your own manifolds unless you are lucky enough to find some Venturi parts.

The 24v engien is a very different animal from the 12v's. The "simplest" route to 250hp is a 3 litre 12v. All your ancillaries will bolt right up - get yourself a Laguna engine, a set of pistons and an A610 intake manifold from Renault. Bob's your mother's brother.

But it's never that simple.....

so it is a must to change the pistons? is that because they are to weak (not forge) and will be burned under boost pressure?

so it is a must to change the pistons? is that because they are to weak (not forge) and will be burned under boost pressure?

Not nessecarily. All depends on the boost pressure, intake temperatures and ecu mapping.

The standard 9.6:1 pistons are not up to the task of anything other than a low pressure turbo. I doubt you'd see 250hp on original pistons

I've worked on DeLoreans with standard pistons that are blown to only 6psi and seen some lovely holes created.... ok theyre not EFI but they ARE 8.8:1. The crown on a NA 12v is wafer thin.

No offence Martin, but as you say, thats very old tech, non efi, 20 year old turbo conversions with crap turbos, intercooling, fueling etc... If you had blown holes in pistons, then that is nothing to do with them being weak, that is simply detonation from poor fueling or too much advance. In this day and age, mapping and correct fueling is far more important than the componentry within..

He did mention he only wanted to run 5psi in his first post.

It won't struggle with supercharging on standard compression even up to say 7 psi, so like wise, not have a problem with turbocharging if charge temps are similar and mapping is done correctly.

None taken However, neither of us have tried it, but you and I both know someone who has. When I pulled the heads off my donor Laguna engine and saw 9.6 pistons staring at me, I rang him immediately and was told categorically not to try blowing them "because they'll last about 5 minutes if you're lucky". .

Have you got any documentation on a standard 3 litre with a blower of any sort? I met the chap who was at Donington last year with the Saf Quadra - you can't get more than 2psi on a V6 by running a turbo off only one side - been there done that (and blown the turbo as a result!).

you can't get more than 2psi on a V6 by running a turbo off only one side - been there done that (and blown the turbo as a result!).

Yes he can. He wasn't running two turbos with one not working like you had on your D engine, which was blowing all the boost out of the other turbo.. He ran the the engine as a single turbo engine, one manifold went straight to the exhaust and the other manifold was connected to the turbo..

Again, there's no point ringing alarm bells just because of the 'compression ratio', I told him not to bother because he was using a standard Safrane ecu with no provision for boost..He could be running 6:1 compression and it would still blow up..

V6's, on standard compression that I know of, are a 2.8 A310 (10.5:1 compression) running a centrifugal blower at 7 psi making 252bhp, and there are two 2.8 oddfire Volvo V6s fitted to Pug 505's, both running LPG mixers, standard compression. One is twin turbo'd at 12 psi making 270kw and the other is a single turbo setup (same engine) making 200kw.

Who hell he I don't really care anymore ............................

[

Yes he can. He wasn't running two turbos with one not working like you had on your D engine, which was blowing all the boost out of the other turbo..

Please, give me some credit..... One blew, so the intercooler was capped off on that side so we just ran on one. That turbo was fine but couldn't deliver more than a couple of pounds of boost because the closed loop effect is lost.

Do you know if he ever got it working because he certainly spent plenty on it

[

Yes he can. He wasn't running two turbos with one not working like you had on your D engine, which was blowing all the boost out of the other turbo..

Please, give me some credit..... One blew, so the intercooler was capped off on that side so we just ran on one. That turbo was fine but couldn't deliver more than a couple of pounds of boost because the closed loop effect is lost.

Do you know if he ever got it working because he certainly spent plenty on it

'Closed loop effect?'

It was most likely the turbo was too small to support a breathing 3.0 V6 on its own. The turbo's you had are equivalent in Garrett terms to a T2 so wouldnt be able to support much air flow on its own, a couple of PSI would be about right..

Colin (with the Safrane) was running a T28 (good for 300bhp) so was sufficient on its own upto about 10psi.

Closed loop effect. Yes, a turbo is a mechanical closed loop feedback system. Bleed off half the exhaust and it isn't any more so I wasn't at all surprised that it didn't work.

Closed loop effect. Yes, a turbo is a mechanical closed loop feedback system. Bleed off half the exhaust and it isn't any more so I wasn't at all surprised that it didn't work.

No, you have twin turbos on seperate banks. Each turbo doesnt know the other one exists. The exhaust manifold pressure of one doesnt affect the other.

What you are saying would only happen on a straight 6 with a shared pair manifold, and even then the actuator on the only turbo working would simply not open as far, making it work harder to keep the original boost pressure up to where it should.

Your single turbo couldnt simply keep up with demand.