davepnola

Opinions needed, I bought a 968 6 speed and 951 partscar . What would be the most cost effective way to make 3 litre turbo using both cars ? Converge both engines and of course endure some expenses . (or a lot ) Thanks for your input ! Davepnola

RKD in OKC

You might give Mike Lindsey at Lindsey Racing a call. He turbo'ed a 968 this past summer for one of their customers.

davepnola

I will , but I will do all the work myself . I am just looking for suggestions ? I need to know if using the 951 crank in the 3.0 litre block will allow the drop of compression needed , or 7.0 compression will be to much ? Or where is the thread on the 3 litre Vario Cam A Clone of Pwerhaus ?

RajDatta

Cheapest way to do it would be to take the 2.5 and stuff it into the 968. Anything with more displacement wil cost a LOT more $$$. Even a 2.8 or a 3.0 is mega bucks. With a 2.5, you can still make very decent power.
Raj

davepnola

Does anyone know what Powerhaus is doing with the variocam Turbo ? Specs or thread to know whats being used to build the setup?

whakiewes

Raj is correct. 2.5L 8-valve will be the simplest form of turbo'ing the 968. If you choose to go 3-Liter you will need to either sleeve/bore the 2.5L block to 104mm which you can expect between $1k and $3k depending on how nice you go, then low compression pistons at $600-$2000. You can use 951 rods with 968 crank, but they are heavy. Since your already in the engine some nice aftermarket rods should go in at about $1000 or so. Your other option is to get low compression 104mm pistons and a 2.7L head from an 89 944S. Going that route most of the 951 parts will bolt over - cross over, oil center/engine mount, intake, intake piping, turbo, etc...

The Powerhaus turbo swaps are typically done with S2 non-variocam 16V heads. They have been toying with variocam for some time, but it adds a ton to the tuning. If you wish to go that route you have a couple of options. Hack up the 968 and the 951 manifolds and weld them together in order to fit the turbo on the intake side. This manifold hack doesn't flow very well, but it gets the job done. You will need to weld v-bands or another mounting device to make the crossover fit 968 exhaust manifolds...not very hard, but takes a little work. After that most 951 parts will bolt over. Your still left with tuning, a clutch, and the 11:1 compression ratio.

In short, without going into a ton of details you can do a 2.5L turbo 968 for nearly nothing as you sit right now. Any other 3L options whether 8V or 16V and you will be looking at $3-10k minimum. I promise if you skip out on any part it will bite back. $3k and you will probably end up spending $10k by the time you get everything down. I have looked at every option, and the only reasonable way is a 2.5L 8-valve or a 3.0L 8-valve with a 2.7L head. Otherwise you have a ton of custom work which is duable but very time consuming (ask me how I know) or spend mucho deniro.

Wes

Wes

davepnola

What year cars had the 2.7 head ? And what compression ratio does the 2.7 litre head drop the 3.0 litre block to : I Have not made my mind up yet, I am pretty sure I would like to use the 3.0 litre block though ? Can you drop the 951 crank in the 3.0 litre and then turbo charge ? Would destroking the 3.0 litre block work ?

333pg333

Why can't you use the 3.0L block and the 3.0L crank and just buy the lower compression pistons and suitable rods?

Porsche-O-Phile

Hope you got $2,000 for pistons dude.

95ONE

Um.... turbo charge the 3 liter as it sits. It's an extremely efficient head. I think many are too used to the limitations of the 2.5 liter. Even with the high compression, on 93octane, you should be able to boost to 12psi. With a good tuner You'll be boosting for years.

I know many of you are shaking your head. Don't. The Valves wont burn. The engine won't detonate to oblivion, etc. You only have to get some form of management. Larger injectors. A turbo set up for the car. And someone who has a clue on how to tune. (I custom make them (turbo kits) for Honda's with 11:1 comp ratios running 14psi boost on 93 octane.) (I don't tune, I fabricate, My long time car friend does that.... very well) It's been 2 years and they're still running.

The 3 liter isn't a Honda motor, but has still proven itself worthy and in many ways surpass Honda engineering. Beleive in the more recent german engineering. It's quite capable. It (968) does CURRENTLY run in the JGTC (Japanese Grand Touring Car) event.

saxman

I to come from the honda world of high compression turboing. I don't know if I'd be in a huge hurry to run 12 psi(although on 93 octane, with good tuning, it's most likely more than possible). Even with 7 psi or so, you'll see huge gains, and with conservative timing maps shouldn't have any issues with reliability.

Guns951

Contact Chris "Mad Scientist" White as he's turbo'ing RolexNJ's 968 motor with a 16v head. He's also building my 3 liter 8v motor. He knows his stuff quite well, and is always willing to talk.

chriswhite@944enhancement.com

Chris White

Close - its chris@944enhancement.com !!

There are many, many ways to skin this cat. Some cost effective and some very expensive. You haven't said what you intend on doing with the engine/car when done - and that makes a huge different on how it needs to be build.

RajDatta

Towards the end, Powerhaus did use Variocam, in Miles car because they used standalone EFI for management.
Raj

fast951

The least expensive 3L turbo route (may not be the best), is to swap the 16V head with a 8V head, this will lower your CR to a hair lower that 9:1. Use the 951 intake/exh headers and turbo mount.. Tune it properly. This will be the LEAST expensive route, but not the best route.

If you decide to go into the engine talk to Chris first.

If you decide to use the VarioCam we can control it with the PB or with the 968 DME. No need to change engine management.