R33 Gtr Needs Help!

[BRNGIT]

Hi Everyone,

Im new to the sight and need your advice! I will start with the Mods to my car, then get into the issue. (issues)

1997 R33 GTR V-Spec

75000ks

5500ks on New Engine

HKS F-Con Pro ECU

Greddy Profec B Spec2

Worked Head

Worked Block

Worked Crank

Ported and Polished

Race Balanced

HKS 272 Cams

HKS Adjustable Cam Gears

HKS 1.2 Metal Head Gasket

SARD 800cc Injectors x 6

HKS Filters x 2

SARD Intank Fuel Pump 280LPH

BDC Industries Fuel Rail

TurboSmart Adjustable Fuel Preasure Regulator

Nizmo N1 Oil Pump

Nizmo N1 Water Pump

Nizmo Thermostat

Tomei Valve Springs

CP 86.5 Forged Pistons

CP Piston Rings

Eagle Forged Rods

Eagle Rod Bolts

ACL RaceCrank Bearings. Mains and Big Ends

Garrett T28 RS 60 Turbos x 2

Redline Headers

Redline Dump Pipes

Redline Oil Baffle

Redline Racing Radiator

SplitFire Ignition Coil Packs

Gates Racing Belts

Greddy Air Diversion Plate

Greddy Clear Cam Cover

Greddy Oil Cap

Greddy Radiator Cam

AfterMarket Intercooler 115mill

AfterMarket Remote Oil Cooler

AfterMarket Oil / Radiator Catch Tanks

AfterMarket Cold Air Box

AfterMarket Hicas Remover

Assorted Braided Lines

Earls Fittings

Motul V300 Engine Oil

Nizmo Twin-Plate Clutch

Nizmo Flywheel

HKS Silent Extreme Exhaust

Kakimoto Tuned Length Downpipes

TEIN EDFC Suspension

18-10 inch Vaulk Racing Wheels

Ok, thats about it for the go-fast bits....Have done a 5500k run-in on the new Engine. Did a mild Tune at 2500ks (10psi / 4500max rpm = 300rwhp) Anuther Tune at 5000ks (17psi / 6500max rpm = 425rwhp) Now the problem. Took the car to the Tuner this morning. Up until this morning, the car had HKS 600cc Injectors. Tuner is VERY careful and didnt want to push the tune last time (90% duty cycle or something). Told me to get some 800cc Injectors. We fitted these this morning. Put car on the Dyno, did a couple runs...all is good! 18psi / 7000max rpm / 70% duty cycle = 525rwhp. Im happy. Tuner happy. OK LETS DO IT!!! Next, up the boost to 20psi / 8250 max rpm / run the car up and coolent starts pissing out of the radiator overflow tank. (about 1 liter) Damn. Might be the Head Gasket says Tuner. WHAT says i?!?!?! How can this be? Metal Head Gasket. Engine built to handle 23-24psi. Not even close yet... Did some sort of test with a container on radiator. Put in blue liquid. If liquid turns Yellow, blown Headgasket. Liquid does NOT turn Yello but... there are some bubbles..... Worried look on Tuners face.... Couple of options came up. I dont like any of them! Spent a bloody fortune on this thing! Now, what are your thoughts??? Do i need to do the Head Gasket? If so, how can this be? Its HKS. Its only done 5500ks. WTF?!?!?!?!?!?!? (Im pretty upset) Anuther question. Does anybody out there have similer mods? What kind of RWHP can i expect? My goal is 600 + rwhp. Possible? Also, the Cams are set to 0 degrees (i think thats how you would say it) Is this ok? Car is at full boost at 4750rpm and pulls like crazy to RPM cut. NO drop in torque. Line is dead flat. Its amazing. Is the setting ok? I would like it to boost earlier but i dont want to lose top end... Will this happen? Sorry to blab on here. ANY help would be hugely appreciated. Look forward to you replies and help. Thanks

[Grunter]

When the engine was rebuilt did they deck the

block?When using metal head gaskets you must

not only machine the head flat but also the

engine block to ensure a proper seal.

[BRNGIT]

As far as im aware, they machined everything.

[Sydneykid]

OK, he has done a combustion/fuel in the coolant test, so the next check I would carry out is a coolant system pressure test. That will tell you if there are any leaks in the coolant system, if you do the test with the spark plugs out it will usually show quite quickly a head gasket failure. ie; water pisses out the plug hole/holes. Plus just removing the spark pugs may reveal something interesting.

If that proves negative, then I would do a leak down test. That will confirm if there any leaks from the combustion chambers. We do leak down tests on a new engine after 20 minutes running and then at 500 k's, just before we do the final tune. It is the best check of the engine's internal condition and whether or not the rings need more running in. In this case you are looking for combustion chamber leaks to anywhere.

It may be something as simple as a leaking hose (radiator or heater etc) or something as bad as a cracked exhaust port. Neither of which have anything to do with the head gasket. The above tests will confirm which it is

cheers

[BRNGIT]

Thanks Mate. I will get these tests done today.

[Marlin]

Certainly check everything that SK said for sure, but have you eliminated the possibility that it may have just simply gotten hot on the dyno after succesive runs and had a bit of a spit out the overflow. Wouldn't be uncommon at that level of tune.