86 951 Driver

Check out pelican parts for the supercharging threads. There are a couple guys running some good setups over there and running with stock 951's. I know that one guy is running an eaton m90 making decent power. I am going to copy his design of his setup and build a little quicker car. I have a 924S though so its lighter.

asia944

again your are wrong I talking about pure engine not turbos no superchargers! way a toyota ATLANTIC 1.6 liter make 240hp at wheels about 265hp at crank and why a 2.5liter PORSCHE CAN NOT MEET THAT!!!!!!

M758

Dude,
A Atlantic motor is very different from a 2.5L 944 motor. Beyond that I told you clearly how you can make hp in 944 motor. There are alot of reasons why it is expensive and time consuming. Something tells me you don't have patience to understand that or the patience to actually make it happen.

I will explain some this to you inspite of it probably going over your head...

Fundamentally the main reason the 2.5L 944 motor does not make big hp is that it was not designed as high reving motor. The motor is 1/2 of the 928 5.0L v8 motor under development at the same time as the 944. At the time 928's motor was designed for low rpm torque and mid range. It was never designed as a high rpm screamer. That lead to several decisions made in the design that were ultimaltly limiting in high rpm ability. Now the first 928 motors were 4.5 and 4.7L units. The size was reduce due to fuel concern back in the day. When Porsche began looking to replace the 2.0L Audi motor in the 924 they considered many options, but found a 4 cyl version of the 928 motor fit best for their desired horsepowerlevels and many other factors. So 944 motor was developed in 2.5L 8 valve form at 163 hp in europe.

Now one intersting thing is 163 hp is quite strong for 8valve motor considering it took a 32 valve 5.0L motor to come close to the hp/liter output of 944 motor. It seems to me the way 944 motor makes power is through a strong mid-range and reasonablely good intake and exhaust. If you notice the 944 comes from the factor with a cold air intake and nice 4-2-1 headers rather than a simple log manifold most cars leave the factory with. This why intake and headers as bolt on have such little impact. Porsche alread optimized these parts.

Now the real reason the motor does not make power is the head design. The head was never really optimzed for a 4 cylinder high reving motor. The design is really 928 design. Prosche never felt the need to update that as even with the less efficent 928 head the car still made its power target for its day. When Porsche did want more power from the 944 motor they did 3 things. 8 valve to 16 valve head, more displacement, added Turbo. There were not other updates made to increase hp. I think the reason for that were that those were the most cost effective means of achieving the target power. So in the end I believe both the bottom and top ends of the motor are just not designed to rev very high. I have heard of motors going to 7000 rpm, but most just do not. I believe it takes alot work to get there as the basic parts get too heavy for that kind of engine speed. The thing is a motor's torque is ultimatly the limiting factor and that is mostly defiend by displacement. More displacement = more torque. Can be genereated from RPM. For example Formula 1 motors are 2.5L motor and make 700-800. Howevever the make much much less torque and it teaks 19,000 rpm to make that hp. Making any motor spin that fast takes ALOT of work and there is no other to make a normally aspirated small displacement motor make that much hp.

In the end if you want 250 hp from a 2.5L motor 944 motor I bet it can be done. It will take all kind of work, lots skills and money to burn. For the average Porsche guy it makes very little sense to do that much work when you are only reaching the STOCK output of the 944 Turbo S.

sillbeer

VERY well put Joe!

Andy1212

JAJAJAJAAJAJAJAJJAAJAJAJAJAJ!!!1!!!!1111

KY944S

Asia944, could you give us some pic's of your car and maybe we could give you some input.

GodSpeed

Ohhh God Damn Please let it be...Oh F*** Yes.

KY944S

I do work for the Military and on the side I do mods on 944's. I have gotten N/A engines up to 235hp. If you could here post Pic's and discriptions of your car I would be more than happy to give you some info on how I do it.

DMB14

Am I the only one who is fine with the fact that their N/A has "only" 150 hp? I mean think about it. The 911 3.2 carreras that they were making at the same time as the 944 had 200hp in the U.S. That's 50 more than the 944. Would it have made sense for Porsche's entry model to have comparable performance to the 911? The 944 had to fill a whole in the market and it did that very well. It's still a damn fun car to drive whatever the #s are...

Andy1212

I agree.

lart951

ASSia can it not be done, meet atlantic toyota power out of engine.

WolfeMacleod

Wow. I was THIS close to suggesting that that wasn't Alina. The language in the first post was just too good.
Then I saw post #25...and blew my theory right out the window.

mavfan

guys, 168hp/200tq... i'm a little behind fishey...

sillbeer

Z-man

Neon -- please don't suggest that to Asia944 aka Alina.

It will be difficult for asia944 to check out the Pelican parts forums, since once it is confirmed that asia944 is alina, asia944 will be banned, just like the other 20 or so aliases that Alina has used on Pelicanparts.

I can personally guarantee that. (You don't go around calling the Pelican Parts moderator a mother f***er and expect to be welcomed with open arms...)

-Z-man, Pelicanparts 944 forum moderator.