FI is the best hands down, Just gotta know how to tune it and get the supporting mods to handle it, Get Maxtune with the Maxtronic, Plug and play Stand alone ECU tuning mad easy, Adjust for any mods. The problem with the NA's isnt the Fuel delivery its the HEAD, and the low compression mixed with poor ignition tuning. Bump the CR to 10.2 or EURO 10.5. Work the head and get a GOOD cam and exhaust setup, Then get Maxtronic and run the 93 octane maps. WORLD of Difference over any carb setup or stock setup

That's sorta how it should have come from the factory...:rolleyes:
The problem is you have to throw $1000 at it to get it to perform closer to its true potential.

The car I almost ended up with (for half the $, too) before I came across the Porsche was a 1991 infinity G20. 2.0L 16v dual cam I-4 that made 140 hp and redlined at 7500 rpms. Not bad for a cheap everyday passenger car. An Acura Integra base motor makes about 160hp and close to 190 in GS-R trim, and that's a 1.8L.
Point is, the ol' "no replacement for displacement" saying is totally in the 944's favor, and for a respectably ahead of it's time engine management system as the Motronic, and all the advanced engineering that goes into anything with "PORSCHE" cast into the cam cover, it just doesn't haul butt like it should, as everyone already knows. I wouldn't trade the Porsche handling for the world, but I still think about that Toyota motor now and then (as well as it being in a car at least 2 or 3 hundred pounds lighter). :(
At least if I'm driving in a place that only has 86 octane gas, I'll be ok.

About how much of a power increase could the stock fuel injectors running on stock fuel pressure feed, anyway?

Problem is the 924/944 suffer from the fact that they are entry level porsches, they are missing the fine tuning and simple upgrades because of the fact that they (at the time) where not allowed to out perform the 911 or for that matter any model that was more $$$$ then them, yes improvments can be made, yes its expensive due to the small aftermarket support. But its fun lol, im not sure about the hp rating of the fi system, but if you ever hit the limit how hard is it to swap injectors and a fuel pump and regulator, not hard at all, i think the 2.5l just needs more people to experiment with it

What size are the stock NA injectors?


-Rogue

maybe missing the point?
 

Don't forget when making ouput comparisons, that this NA engine was available from the early 80's, and then compare torque curve with other motors of that era. This motor delivers smooth output all the way up the huge revband. Ok,it hasn't the power of a Corvette, but it was never intended to have, but it did compete well against its contemporaries, eg the Lotus 500 series, and the many Ford V6 engined sportscars of the time ,etc. .

Heck remember the Ford Mustang GT from the early 80's was lucky to put out 140 hp with twice the displacement.

Speedy:)

The only trick would be finding low impedance injectors that fit, and have a higher flow rate.

Wouldn't stock Turbo injectors be fine? They are ~36lb/hr injectors compared the NA ~24lb/hr units.
Obviously you would need a chip or piggy-back to utilize them.


-Rogue

Stock turbo injectors will work fine provided you can tune for them.

If you needed something with even more flow than those, there are plenty of options from Siemens and the like that will work. You can run inline resistors to make up for the impedance difference. Alot of guys run no resistors and have no problems with different injectors.. you just need to be careful because the injector driver gets really hot when at or near full duty cycle.

Well first you would have to build a engine that would need that much fuel, a 2.5l NA setup with a good performance build would be fine with stock injectors and some tuning as long as you dont increase displacment or go forced induction. Givin those limits i dont think you would need bigger fuel injectors

A 3bar FPR would give close to a 10% increase in fueling over a 2.5bar. So even if you are close to the limit, a simple FPR upgrade should give more head-room..


-Rogue

Anything is possible for enough$$$$$$$$$$$$$$$$$$$

http://www.jmengines.com/index.htm

BINGO!