ernie9468

CBass __is dreaming if he think he can get 220 hp out of the 924S 2.5 motor by doing the mods mention,208hp or 236hp will be acheive from a stock S2 or 968 motor transplante witch are the most popular .The 951 to 924S transplante is feasible but not seen very often due mostly the the plumbing complexcity of the 951 motor.

bonus12

hmm, well i hate to ask the dreaded question but here it is: how much hp is achievable in a 924S or 931 with relatively simple modifications? for example, i have read somewhere on this forum that the stock turbo + powertrain in the 931 can handle 1 Bar of boost?

ps: those martinis are so awesome! i want that stripe!

thirdgenbird

i have gotten so sick of explaining this that i will often just call my 924s a 944.

pettybird

my 931 is running 10psi, which is the euro spec. with no intercooler, a non-adjustable CIS injection, variable fuel, a small turbo and VERY basic computer controls the 924 boards advise against any more. The car's pretty peppy when on boost...I'd put it ahead of a 924s/944 in a straight line race as it's lighter with the same or more HP. Lots of turbo lag, though.

The martinis are cool but are NA 2 liter cars only...neat, but like 90hp.

ernie9468

What excatly do you want to buy ,your talking about two completly different cars here .The 931 is not for everybody, unless your are very familiar on how to fix & service it.On the other end the 924S is simple -easy to fix -easy to maintain & parts are available at a decent price.A friend of mine has a 931 & even though he is a real good mechanic, sometime when things goes wrong with it he has his hanfull trying to keep it on the road.Not saying there not a good car ,just that you have to be very dedicated to it, if you plan on buying one unless all service & maintenance is up to date.Buying a cheap one whitch need work done on it will certaintly drain your hard earn money out of your pocket.Now all your thinking rigth now is how to get more power yet you love to owne a 924S ,well my friend you better change your way of thinking rigth now unless you have unlimited budget & if you do, go for an S2-951 or 968 not a 924S 2.5 NA. I've own a 944 for 26 years so I kind of know what I'm talking about.If your still interested in getting a 924S after reading this I suggest you buy the best exemple out there with records & maintenance up to date (timing -balance shafts belts -water pump & clutch being done lately ,it will save you a lot of $$$$ .Motor wise a good tune up ( spark-plugs-Dist-cap -oe plug wires & an MSD blaster coil will do wonder ,a chip & a less restricted exhaust will also help a lot.The air boxe you leave has it is with an oe filter .Then you can get serious by sorting out your suspension with whatever you fancy,left after doing all those things witch will probably cost you more then one of you paycheck will be to learn how to drive it.

odurandina

bonus12

thanks for laying it down straight... the 924S does appeal more than the 931 in regards to the fact that i'm just a backyard mechanic, but i also want to be able to improve it's power knowing that it only weighs 2700 lbs. and more power would make a big difference. i've got a 951 now but, again, i am a still a beginning mechanic so maybe a 924S would easier for me to work on until i can approach the 951. if i could improve the lbs per hp ratio in the 924S or 931, i would be a very happy man. it's sounds easier to tap into greater power in the 931 as opposed to the 924S.

i guess i am weighing the pros and cons of these two ideas: mechanical improvement difficulty vs power potential.

of course, i have always loved a turbocharger. i can't afford a 968 or a new engine for a 924/924S/931.

Jay Gratton

I loved my 924S as well, I miss it. I actually sold it to Matt Romanowski who bought it for his wife and now they are selling it. He has it for sale here, check it out as I set it up nice for both street and track.

Lemming

Nothing but the truth!

931GT

If you want easy power you'll need to get a 931 over the 924S. There are tons of threads on how one might get more power out of the 2.5 n/a lump and most conclude its difficult, expensive and not worth the effort.

As far a the 931 goes... $50 for a manual boost controller, $75 dollars for a boost gauge, another $20 for hose and fittings, and in a short afternoon you'll get 175hp. Many will stop there since its plenty quick at Euro Spec power levels but if you must get more... adding a "holbert location" intercooler and giving it another 2 psi boost bump will see a bit over 200hp. It'll probably cost around $1000 to get the right IC and have it fitted properly. After that you'll need to upgrade the turbo, install a wideband AFM, get a larger FMIC and deal with a lot of plumbing issues to get it right, but 220hp to 240hp ought to be doable, and still on the stock CIS. You might need to add an adjustable WUR or digital WUR to this last setup to ensure proper fueling.

There really is no comparison between the 924S vs the 931 when it comes to power upgrades. And just to be clear... besides the engine and narrow body work, the early 944 inherited most of its parts from the 931. Suspension, transmission, brakes, interior and a ton of other parts are interchangeable.

Having said that, there are many 1980 931s with 4 lug suspension and rear drums... don't buy one of these... unless you also want to add a 5 lug conversion to your list of things to do.

odurandina

the reason i thought your post to be completely hysterical, is that not only is this TRUE, but this was also the first thought that entered my mind and probably most of the other people, and then there's the rather sublime way you put the "truth" into the fewest number of words.... .... the '88 924 motor might be nice and all, but the car, w/ that horrible shape, should have ended way back in 1983 (i admit the 924s look much better in red).... but, the only way you're getting to 230 hp out of this thing is with a 968, 944 Turbo engine or a 5.3 litre Ls truck engine (or larger LS variant) is going to get you there.... and for that matter, why even bother when there are so many sexy, 944 tubs around ?

M758

924S and 931 completely different motors.

931... well with enough work and factory part 345 bhp as the factory did for thei 924 Carrera GTR.

924S.. That is 944 motor so not much short of forced induction or massive displacment changes.

The way you make a faster 924S is by making a 951. The 951 is 924S with wider body work, bigger brakes, and a turbo.

If you want a 931 fine, but you already have 951 which is better than a 924S or 931. I have both a 951 and 944 race car. I keep the 951 stock because it has plenty of power and race prepped the 944 using many 924S parts. 924S parts cars tend to be cheaper that 944 parts cars and underskin all the parts are the same. I chose to mod and race the 944 because it is cheaper to build and maintain. It will however NEVER have the power of my 951 without an engine swap. I am ok with that and it current stock power level.

whalebird

924S>944. A 924S is a very nice little car and often overlooked.

odurandina

very quick car. got one up to like, 136~137 mph. felt ok but, still i liked my '87 944S better.

didn't like the narrow plan of the car. hated the fenders, narrow wheels, and the old style interior.... V2Rocket in 3.... 2.... 1....

JnJNY

Love my 924S.