BRNGIT

Hi Everyone, Just wanted to see if anyone could help with an issue im having. Not sure if its called compression surge or reversion or if they are the same thing! Cruising at around 3000rpm, im getting a funny noise like.... i have no idea how to write what the noise soundsd like! Its obviously air "surging" if that makes any sense. If i give the car throttle, it goes away at aroun 3500rpm. Was told it was my BOV so i fitted a new Greddy Type R. Didnt help. Was told it was the lack of standard plumback form BOV. Was told it was that AND the lack of balance pipe on the intake side. Have also been told its the turbo choice. (GarrettT28RS60's) Have been told its the bane of the RB's. Can be tuned around but not fixed. Any ideas? Any fixes? Its bloody annoying! Thanks for your help.

Thanks Mate. I will get these tests done today.

As far as im aware, they machined everything.

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