Lanny Curlett

951 "s" w/ ported head, L/R intake, fresh K27/8, 55 Lb Injectors, L/R Stage 2 MAF, 3-4" Exhaust, Tial 38mm Wastegate running 15# boost. What can I reasonably expect to the rear wheels assuming good tune and race fuel?

Josh B

Are you heading to the dyno soon?

brrgrr

15 lbs boost held to redline will get you around 290 whp, give or take.

mudbuddha

I am with brrrgrr...maybe around 300 in tq.

Lanny Curlett

As soon as it's finished. I had the head on another Turbo S and dynoed 302 torque and 276 HP on pump gas, K26/8 stock internals and fuel at 15 PSI boost. I would have thought with the K27, MAF etc that it would make more. We shall see.

George D

On this particular dyno you should see around 310hp and similar TQ. Maybe a little more TQ, if you can get the turbo to spool up fairly well before 4250RPM.

CPR

317hp~312TQ

Dial it up to 17#'s and see 338hp~330TQ

gcb951

You should try putting more stickers on the car. Stickers are key in big HP. My 944 only had about 225hp and once I put a VTEC sticker on it I was putting down 400+.

No seriously you should be at about 300/300. Good luck at the dyno.

333pg333

Be good if you could do a back to back comparison between the stock intake and the one that you have. There have been ? raised over the true efficiency of 'that' one.

SoloRacer

Lanny,

If I remember correctly made 307 rwhp @ 18 psi with a k27/8. Pump gas, SFR exhaust, stock internals. A guy that races here (drilling manager at Suncor) made a little over 300 rwhp (330?) as well with his k27/8 and stock internals at what I believe was 21 psi.

Just for reference.

CPR

Solo,

A little over 300 sounds a bit low for a 27/8 @ 21#'s, no?

I was at 308 RWHP @ 17# with a 27/6 (stock internals). Vitesse management, 3" fabspeed, TiAL, etc...

just curious, as I would have thought a 27/8 @ 21# to be closer to 340"ish".

SoloRacer

Just checked and my 15 psi run with the k27/8 made 270 rwhp/305 ft-lbs. I was incorrect on the 307 number too - that run was actually 303 rwhp and from my Vitesse Stage III at 15 psi.

https://rennlist.com/forums/944-turb...as-15-psi.html

As for the 330ish run again I'm not 100% positive on the boost level or the exact dyno figure. It's just a rough guess based on what I could remember him telling me. I would have to ask him for the dyno sheet to get the exact numbers.

All these numbers were with no tuning other than a custom set of chips. I'm sure with some fine tuning more power could be found.

Rogue_Ant

At 21psi, a K27/8 will make more then 330rwhp...

SoloRacer

I found an old thread where I quoted what power I made with a k27/8:

My engine was built by the same shop as Rage's but I used oversize pistons instead of sleeves. So far the engine has run pretty strong. The chart above was my best dyno. This is with a K27/8 turbo at 15 lbs, APE Stage 2 chips, Tial 46mm wastegate, Bursche Cat bypass, 3 bar FPR,Profec B. I only did one run at that boost as I didn't like the air fuel ratio. I've since upgraded to Danno's 55lb injectors and chips and will have to do another pull on the dyno to see what changed. The peak numbers were 279.2 HP @ 5400 RPM and 305.9 Ft-lbs Torque @ 4500 RPM. I expect to get over the 300 rwhp mark with the new chips/injectors and pushing the boost up to a maximum of 18-20 psi. I've been told that anything over 18 lbs and the K27 will have excessive exhaust backpressure that will cause boost to drop rapidly.

Lanny Curlett

Thanks Eric and all the rest of you fine folk. I'll post the results when I get them.