powdrhound

Engine got timed today.. The goal is to get it in the car next week...

"02996ttx50

good lord, that stuff is shiny and new and impressive. i cant wait to hear the results from your track outings. but man, thats gonna be something else. congrats on the progress. i am giving some serious thought to buying an already built 3.8.. now if only i could justify it as "necessary". whoops, shouldn't say that! ack

powdrhound

Things are coming along. Last week I installed an upgraded fuel system and lines. Today I finally had some time at the shop and fitted the new intake piping. I replaced the old RUF spiral reinforced intake pipes that have been on the car for the last eight years and started looking a bit weathered. I fitted solid thick walled plastic 70mm intake pipes which are nearly indestructible and are very resistant to heatsoak. Exhaust is also ready to go on. Full 3" with anti drone pipes, secondary mufflers, and V-banded 5" HJS/Emitech Motorsport 100 cell cats.

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Tuxiemama

Nice looking fuel set up

blockhed

Looks great John I bet you can't wait to habe it back .

cbracerx

That exhaust looks lovely!

ReidN

I can't wait to hear it!!

993GT

Unobtainium exhaust? the intake pipes look very nice! custom built or a kit?
Cheers,
Rob

Mongo84

Thought you were going titanium? Too many crazy bends in that thing to make it work with the Titanium? Or you doing a separate race exhaust?

powdrhound

The titanium version is getting built as we speak and is largely built up but we are waiting on Ti V-bands which is the hold up. We decided to make a SS version and then swap over to the Ti version. The SS version will give us a chance to make any design changes if need be and then incorporate it into the Ti version..

powdrhound

Figured I'd resurrect this thread with an update. After 3620 hard track miles (52hrs of track time), we put the car on the dyno to see how the engine stacks up now that it has several years of hard track work under it's belt. The dyno is the same that we used after the engine was built and the conditions virtually identical, 81ºF, 20% humidity (the prior dyno was 79ºF and 32% humidity). The engine is still 100% emission compliant and passed with flying colors last month. The dyno was done again on the same 91 octane 1.25bar UMW race tune. Fuel used was the same 91 octane with a few gallons of 100 octane thrown in (making it closer to 93) for improved margins at the track. The only difference this time is that we had a fan on each intercooler vs. only one fan last time and the car was trailered in vs. driven in so there was a bit less heat soak. We have also sorted out the fueling on the car which was not optimal on the prior dyno. The dyno pull was done in 4th gear to 7500rpm resulting in 150mph at the wheels.

The end result at the wheels was 621hp / 720ft.lb which surpasses (by a respectable margin) the original figure of 598/672 that we recorded right after the engine was built. We are attributing the increase to a fully broken in engine, much better fueling, and slightly better airflow over the intercoolers. The beauty in this is the area under the curve where the engine is at 600hp at 4500 rpm and still making 600+hp at the 7500 rev limiter. Note that at 4000 rpm we are at 530hp and 700ft.lbs

My hats off to Chris Cervelli for building a phenomenally reliable race motor which has been 100% trouble free and to Kevin at UMW for providing a custom set of his fantastic K16/997GT2 zero clearance turbochargers along with his amazing tuning. I am so impressed with these turbos that Kevin is currently building a set of identical spares for me to have on hand.

The goal of this dyno was to get a baseline as we will be installing a set of 3.5" cat bypass pipes and then getting the car on the rollers again for a full comparison. We are estimating a further bump of about 20hp due to the reduction of pumping losses as a result of the deletion of the cats. The main goal/benefit of deleting the cats will be to slow down the turbine speeds, reduce EGTs and prolong the long term health of the engine. Additionally, I finally have the 4" Aerospace Intercoolers on hand and will be retrofitting them also which should lead to further gains along with the lowering of IATs. More to follow...

Details of the engine in it's current form:

GT3 RSR crank (53mm rod journal)
GT3 RSR oil pump
Mahle Motorsport 3.8 liners/pistons (23mm wrist pin)
Pauter rods
997GT3 3.8 head gaskets
Todd McKenzie ported heads w/ 9000 rpm valve springs
996Cup pulley
RUF high flow intake manifold
2.75” hard plastic turbo intake pipes
Unobtainium Welding 3” exhaust w/ 5.2” HJS 100cell race catalysts
UMW 1.3 bar ECU
UMW K16/997GT2 ZC turbos
Walbro 450 fuel pump with -6AN fuel supply
Motec DHB fuel controller
OEM ported headers
997.2 GT2RS Intercoolers
OEM MAF, Airbox, plenum and throttle body
964RS engine mounts
A/C delete

kmagnuss

Impressive.

Jferrante

Awesome John! So what is your anticipated rebuild timeframe in hours? 100?

powdrhound

We discussed this today and I was originally shooting for a 100hrs before opening it up but Chris feels that it won't be necessary as long as no issues crop up. So maybe 125 or so.

Slalom996T

Impressive!