AScholtes

It should be a faster spooling setup than the /8

Voith

What is the downside of /6?

AScholtes

Max power potential...

black944 turbo

Most people prefer the 27/6 over the 8 due to spool. As mentioned max power is a bit lower, but from my understanding not much.

Voith

So what is that in numbers? I would like to be in the 300~320whp range. Most probably I will use non stock downpipe and 4" exhaust.

I like fabspeed 4".. did they stop producing them? I don't find it on their web page..

AScholtes

I think you can achieve that with the /6 without a problem. The major issue from my research is the compressor on the 26 running out of steam in the top end, the 27 doesnt seem to have that problem and you should be good to that HP level with the 27/6

Voith

Thanks. I'll use that 27/6 than as it is.

What about compression ratios, if I go with custom pistons I can change the ratio to any desired level.
What compression should I go with if I choose to get new pistons? I was thinking somewhere between 8.0:1 and 8.5:1..

As I understand it, low compression ratio is good for high boost, but sluggish while off boost. If I get higher compression, off boost driveability will be better, but pistons will suffer when higher boost is used..

Is there any specific info gathered on that topic for 951?

AScholtes

You have it. Most modern ways of thinking and designs in turbo engines use a higher CR and lower boost levels. It is better for driveability and with modern turbo designs, the turbos can stay in an efficiency range and be small and more responsive.

For me, I would go with a 9:1 or 9.5:1 setup and keep the boost levels low....

Of course there will be the argument of modern engine management, combustion chamber design and variable cam setups... so, it's not quite apples to apples... but it still has the same basic reasoning behind it..

Voith

trouble is... I like boost.

Just found some lost pictures of my car while it was still in one piece

AScholtes

I feel your sentiment on liking boost... but I like having torque as much

Voith

Intake port corrections

carbongecko

well it definetly is a project. thankfully for you there are parts for it in most junk yards what kind of weight are you expecting to save by doing this? also are you planning on using the turbos transmission i was reading in a diffrewnt thread that you will run into issues if you try to use the n/a's transmission.
@tifosiman: found both bottles

Voith

I'll use AOR trans that I got with turbo. I will also upgrade to ABS and later offset with brakes off 89 turbo and original 944 billstein escort cup shocks and these rims (18x8" & 11")



I will also get rid of things that are not needed(rear wiper, electric headliht adjustments, washing and such nonsense), but plan on keeping burgundy interior with sport seats, and will reupholster everything.

Plan for this car is to get it as close as it gets to go-kart, but with sort of premium interior and stainless everything.. It should be a bit lighter than stock turbo.

As far as junkyards, there is not a single 944 on our junkyards. Unfortunately I have to order all parts from either usa or germany. Usually its far cheaper to order parts from usa than from germany, or (god forbid) our dealership.

Voith

Got block back from the shop, timeserted and resurfaced for MLS gasket..

This is the most expensive shop ever.. 356€ for timeserting with my timeserts and resurfacing

Voith

And thanks to Ideola, my ARP fasteners are here