944J

been thinking about the v8's in 944's:

390 H.P LS1/LS6 420 Ft. Lbs Torque

Type: 5.7L V-8 Small Block
Displacement: 5665 cc (346 ci)
Compression ratio: 10.1:1
Bore x stroke: 3.90" x 3.62"
Fuel system: sequential fuel injection
Rev Limit: 6000 rpm
Block: cast aluminum
Cylinder head: cast aluminum
Intake manifold: composite
Connecting rods: forged powder metal

this is ~ 280RWHP, 302RW FTLB TQ

cost $7500 plus parts to convert 944 to v8 from turnkey engine supply

pros - low end torque, easy to find parts

cons - loose power steering, ac, power brakes, pain in the *** to convert to v8, and is it really cost effective to do this, is it street legal and smogable in california?

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Vitesse Stage 1
Stage-I has been designed for the 951 owner that requires additional performance and quick spool up. Stage-I brings your 951 to life!.

this ~ 335RWHP/335RWTQ

cost $2995

pros - seems easy, buy a 951 plus this kit and you have 330RWHP/TQ

cons - is it street legal and smogable in california? is it missing low end torque?

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My goal here is to find the best bang for buck ($/hp/tq ratio) for high end street horsepower/tq and drivability in the 944.

It looks like the Vitesse type bolt ons are the way to go unless you want in the area 500-600RWHP? Then you are looking to pay around $16k to start.

ivai

Your thread title says stage II, your post says stage I, which is it?

390 crank hp to 280 rwhp? that's almost 30% drivetrain loss.. is this for real?

ivai

BTW, vitesse stuff will still support 500-600 rwhp, if you've got the right mods (head work, exhaust, wasted spark, etc etc.. maybe bigger bore)

fast951

It really depends on how you drive your car. Race track or stop light to stop light, do you like the feel of a turbo engine, or the feel of the V8. There are some nice V8 944 cars running around. The best I have seen is for a fellow RennLister in FL, IIRC his handle is JPR. There was a thread regarding his conversion. As far as cost, you will have to determine the cost to install a V8. You also must factor in the install of a kit, unless you do your own work.

All kits are for off road use only, however there are customers that pass emissions (for test purposes only!!!).

Stage 1 will make over 350rwhp, however over the next couple of weeks. There is a good chance both Stage 1 & Stage 2 will be discontinued. With the kit you need larger injectors.

A nice V8 conversion works good, same for a well designed kit such as the Vitesse kits. Any modification to your car should be for off-road use only. However, you have a better chance passing with a kit than a V8. You can set the MAF in stealth mode, I doubt you can hide a V8.

Good luck.

Fishey

I think you are better to do your own build/machine etc.. instead of buying a "kit" but thats just me. Also, as far as I know vitesse hasn't hit 600whp yet.

dime1622

doesn't california require all mods to have CARB certification?

Ski

the kit for the LS1 or LT1, after you buy the engine with ALL accessories that you'll need and want, if you do the work, it will cost you at least $11500 - $12000 to do it right. There was a detailed build of one on another forums by a guy who owned a shop.

944J

I fixed it - stage 1

yes the guy I called at turnkey said 28% I believe... is that accurate? I could have remembered wrong and it could be 18%...

still the cost is very high for a v8 that gets the same or less HP/TQ as a stock 951 with a vitesse kit

or is there more that needs to be done to the 951 to get the numbers that vitesse advertises besides installing their kit?

fast951

You are correct! Vitesse NEVER attempted to hit 600rwhp on a 2.5L 951. Personally, I don't think it's wise to set such a goal, it will be short lived. Unless you modify the engine to extreme and expensive levels, 600rwhp 2.5L 951 will not live long.

Fishey

Yes, deal with the stock motor and making sure its in good condition.

944J

this is my point... it seems much more expensive to do a v8 and you still get moderate HP numbers... when you can get a 3 liter turbo from powerhaus for around $16k that will do 600whp which is a 720hp engine.

fast951

The advertised dyno charts detail the configuration of the engine. In addition to the kit, you need to run larger injectors, of course for best results a dual port WG and a boost controller. If you read the kit description, it tells you which injectors are needed.

fast951

If you can get a complete running 3L engine encluding a turbo and engine managements, making 600whp or 720hp for $16K JUMP ALL OVER IT. Make sure to share this info as it will be a great deal.

ivai

John, in looking on Vitesseracing.com at the stage I and II kits, and the dyno charts, I only see what boost the dynos were run at. Is the engine configuration detailed somewhere else?

Of relevance to this thread, what was the configuration of that stage I dyno? Also, the stage II dyno (VRSTAGE2's car) making 341 rwhp.. Do you know if it had anything besides injectors/wastegate and your kit?

944J

I think that was what I read on their site, but their site seems to be down... this was just for the engine building, not installation, tuning, etc...