DanD

Send me a note of what you have and how much you want for it.

I found a huge vacuum leak. So that may be part of my lack of boost.

Either way my wastegate is one tired puppy.

Dan

FSAEracer03

Email sent with 4 pics attached, Dan

DanD

The Turbo Engine in the NA car thread spured this update.
https://rennlist.com/forums/showthre...8&page=1&pp=15

The 2 month update is as follows:
The wiring problem seems to be resolved with the engine harness change.
I still have an intermintent problem that I suspect is the DME overheating.

Driving impressions. Driving around town is a dream. The higher compression makes the low end torque significantly better. The 'On/OFF' feeling from off boost to onboost is much reduced. Autocrosses will be much easier to control.

I'm able to run about 12psi with no water injection or octane increase. 18psi wasn't a problem with about a 50/50 mix of 100 octane and 91 pump. Water injection isn't hooked up at the moment, but I suspect 15psi and maybe 18psi will be fine with pump gas.

I have a Knock Sence that shows an LED when it's getting knock. So I'm pretty sure I'm safe in that department.

So far, I'm fairly certain that any new engines that I build will include higher compression. Although, if I'm building them, I'll include forged Rods, Pistons and coatings to handle the boost better. But, we'll see how long this one lasts, maybe I'll just grab another NA engine and do it again.

More later..
Dan

DanD

Update. At the autocross last weekend I ran about a 50/50 mix of 91 and 100 octane. Easily 95 octane. I was getting a bit of knock at about 10psi. Then the timing backed up and the knock didn't show up again as the boost increased to 12-14psi. I'm hoping when I get the water injection working again that the timing won't back up.

Is anyone using the SMT6 to adjust ignition timing?

Barry Johnson

So, you made virtually no "mods" to adapt the turbo setup to a NA block?
Your only issue to speak of was adapting the oil feed (and return?) for the turbo, but the rest was a straight swap?

And, the NA blocks of the 924 and 944 are the same alusil bores, correct?

DanD

The blocks are the same in the later years for the 924S and 944. Early year 944 blocks have smaller oil passages. The guts are different. Rods and pistons. Heads are different, cam is slightly different (depending on who you talk to). Look at the old turbo AD pictures to see if I left anything out.
I used the 924S block, crank, rods and pistons. 951 head, 924S cam tower. Everything bolts together.
DanD

WesM951

Dan,
Thats pretty interesting! I'd like to see what it puts down on a dyno around 15-18psi.

944CS

your pistons are actually 9.7:1

FYI, I did some math awhile back and figured that something like 7-8 psi on 9.7:1 would yield the same compression as a stock Turbo car on stock boost, just to give you a little benchmark for power

and what type of knock sensing setup are you using? is it aftermarket or is it based on the stock 951 circuit?

FRporscheman

It would seem that you can use these tips to turbocharge an NA as well. Like zero10 said though it would probably cost as much as a v8 swap. But just out of curiosity (since I don't know anything about 951s), what would be needed to make it work? Turbo, intercooler, exhaust piping, oil lines, etc. Is there any extra engine management needed? Does the turbocharger have coolant running through it?

AL951

It wouldn't cost that much. all you need is a wreck or blown 951 and change all the parts over. You could also get all the parts Heaven or something like that.

Regards,
AL

DanD

I am very interested in getting it dynoed as well. With the bigger turbo, I would expect to be able to get more boost. Once I get back to 18psi, I'll give the dyno a try at 12, 15 and 18 psi.

Right now it runs real good at around 10psi. so if I'm stuck with that on pump gas and water injection, I'll be satisfied. Then pump up to race gas for competition.

I am running a .065 head gasket. minus .008 trim off the head, it's still about .012 thicker than stock, though it won't make much difference.

Arash, Al is right, you'll need quite a bit of stock 951 parts. Someone post a link to the Turbo Ad so we can see what is different. If you want to run more boost, or even stock boost, you'll need to have something to maintain A/F ratio and possibly water injection. Not to discourage you, because I like to encourage stepping out. But, start with a good car. Something that will be of value when you are done. Like nice paint, interior, upgrade suspension, brakes. There are quite a few NAs out there that would meet this criteria. If it's just an average car, then I would recommend finding a nice 951. Kinda like the one I have for sale....

DanD

Turbos do have coolant lines, but there are Kolken turbos and others that don't use water cooling. It could be setup that way. I really recommend some sort of engine managment. SMT6 is a piggyback. Or stand alone. You're changing the amount of air going thru the engine, so fuel needs to be adjusted. Chips could be used, but you'll need someone to tweak them a few times to get them right. Then if at some time you want to add or remove boost, the A/F needs to be adjusted again.

AL951

Hey dan, How are you?

I need to go and visit you, so you can take me on a ride on the car. lol

so did you have fun at the autocross?

Regards,
AL

DanD

It's always fun.

But I just put Surge944 drop links on the rear. It acted like I put on a larger rear swaybar. Oversteer was pretty bad. Normally on a short course it pushes real bad. (one of the reasons I wanted to try the droplinks). Anyway, they work. I just need to get a bigger front swaybar.

FRporscheman

Hmm, I'm starting to understand the complications of tuning. My NA is pretty nice, but I don't think I'll be turbocharging it - I'm selling it. I'm moving to socal, but once there I was going to buy a "needs work" NA with plans of either a 951 or LS1 engine swap, and having this be my daily car / project.

I think I've seen that 951 advertisement - so that picture has all the parts that make the 951 different from the 944? Does it list them by name?