Porsche Enthusiasts Club Forum

300 reliable bhp in a Turbo is quite common ......................Fact !
God knows what Pauls goes like though
I will be doing a few more tweaks to my black turbo over the next few months, i would be interested to see what Hartech are doing to the 2.5 turbo though

He has said he has no plans to do anything else with it and will probably offer it for sale quite soon. I believe him when he says he simply did it as a training exercise so his staff could make and design something slightly different. I will ask him next week but I believe all he has done is take an S2 engine, machine the pistons so the compression ratio drops to 8.5:1 and then stick a 2.7 head on it. They dropped it into a 2.5 Turbo shell and got Wayne Schofield at Chip Wizards to map it so it runs right. The boost was left at the standard 0.8 bar, and it has a standard wastegate.

You have to run a 2.5 at 1.2 bar of boost and bolt on a lot of things to get to a genuine 300bhp, but it will never match 350lbft of torque and this thing reaches that at only 4000rpm, not 6000rpm

350lbft of torque is nearly what a 5.4 928 GTS develops and so low down.
Did he use the sodium filled valves from a Turbo head.
Try to get more info Paul?

Stephen

I thought Baz used a set of machined 968 pistons as he stated they were more suitable.

OK, now that sounds more like it. It is simply impossible to get 400+hp from a stock 2.5l T with only a head gasket as a change.

350-400hp is fairly easy in these cars now days with several (and I mean several) over here making 350-380 all day. For about $5,000usd you can go from 220 to 330 in about 4 days

Paul, I've been following the updates on the Pistonheads thread, most of it made my head hurt, but please try and pin him down to an approximate cost to do this

and do take lots of pictures

Just recently got in from an excellent day out at Oulton Park with Hartechs 3 litre creation and a number of Front engined fans. The morning started out very damp, misty and cold and there were several red flag stoppages early on due to people not minding the conditions. Paul F (who drives a 968 in the Porsche Club Champoinship) took to the wheel first thing and the rest of us waited whilst he warmed up the tyres and started to clear a dry line for us

When my turn came round, I could instantly feel just how smooth this engine is. A standard 2.5 Turbo can often get bogged down if you take off too leisurely, but the low down grunt from an extra 500cc removes that entirely and yields a more accomplished drive. Once used to the slippy track and able to push on a little more you can really feel the low down 'shove' that this engine gives you. Slow corners that would normally be taken in 2nd gear can easily be taken in third, giving you much more control, much less gear changing and I believe a much faster drive onto the next straight. Yes the huge power does not increase further in the higher reaches of the rev range but that could be addressed if the owner wanted to exploit this setup further.

Boost was a totally standard 0.8 bar and in 3rd and 4th gear it was hitting that well below the 3500rpm of a standard 2.5 but the most remarkable thing is the smooth way in which the boost arrives. No bang, crash, on/off wallop like the car that Porsche built back in the 80's. If you like your turbo cars to behave like that then Barry Harts 3 litre creation is not for you . This car is more like the effortless way that an S2 performs, but has 50% more power almost everywhere with no obvious lag.

Well done Baz, and thanks for a great day out. Others may now be very interested to hear that he has already tentatively started thinking about machining liners to turn any 2.5 Turbo into a 3 litre like this. I appplaud any effort to keep these wonderfully balanced cars going as long as possible, and if it brings more power at the same time as low boost relaibility then who can complain? I've taken a few photo's of the day and also have some in car footage which I'll hopefully post at the weekend when I've had a chance to edit it down and upload to the web.

Very interesting Paul. Please post us the link when you get around to it!

Need more info, wish i had known this was happening at Oulton as i would have been there.

Here's some pics from Wednesday, you'd never believe it was a blue car until you see the engine bay shot at the end:





The silver wheels are road tyres, the black wheels are Michelin Cups







I'll try to get the in car video rendered at the weekend

And the interesting bit will be how much he wants for it when he sells it

Nick's 944 Turbo cab with 417BHP was a bog standard 100,000 mile engine.

Mods were...

9XX Ball bearing turbo
Vitesse MAF kit
Vitesse piggyback
9XX Mapping
9XX stage 2 wastegate
9XX Stage 2 intercooler
9XX 72Lbs injectors
9XX catch can
9XX vac kit
9XX 3 inch exhaust

Head gasket was a 944 turbo cup item, also known as a widefire gasket.. nothing too fancy, just a precaution.

417BHP on a DynoDynamics (pessamistic famous for reading low) rolling road, knicknamed the rollers of truth due to repeatable results.

Torque was at around 398lbs of torque..

Circa £5000 in parts ) and once more in case you missed it... totally standard engine! Not just this, but Nick also drove it to greece and back giving it hell both ways (175mph on his sat nav) without a hickup

as usual.. dyno charts available on request.