GeeTR

Nice cams size. Any chance you have the valve seat pressures and rev limit your using?

Unit delivered. Looks good for price. Packed in foam, though a few fins slightly bent; nothing at all to worry about. Cheers fats!

thats odd >> http://www.skylinesaustralia.com/forums/in...t&id=136910 I saw an ethnic lad with a rather attractive girl person driving this... not this dood ;\

Cus the atmo bov is ejecting charge air, affecting engine emissions out the tail pipe. Purging N02 from a tank into the air... is not differnt to a dentist purging into the lungs of his hot patient, before a quick feel

SlimFit

+2 for Trojan

Commented in the nats photo thread by Widebody32. 2nd was a 400hp current spec Typhon i believe.

They'll often not pass a muffler with a removable silencer. The RTA were cops this year. 3 people i know got done; two of them got done two nights in a row

Det'ing cyl #6 isnt new and fairly well documented (not just in RB's) The long block design causes some issues, that need careful planning to get around when running on the edge. The plenum often design, means more air to the rear cyl in mass airflow situations (big boost / revs) This clearly causes it to go leaner then the other cyls. Water jacket design most likely doesn’t help "hot spotting" around that cyld head chamber either, increasing chances of det. I mention revs, as the stock water pump can cause cavitation, and air bubbles rise... to the head. People use not just an extra coolant reservoir, but attach extra coolant relief lines to the heads water jackets to aid hot water removal from the head. People often use after market plenums, like the Nismo or Greddy, not so much for mass flow, but for flow equality in each runner / cyl. Flowing and fitting your highest flowing inj to cyl 6 can help, though using individual exhaust runner EGT thermo couples and trimming each inj in your ECU is ideal. I agree with others in that the squish zone is to induce high speed movement of the charge towards the centre, increase tumble roll etc. The zone being an issue due to the parts (outer eddy most likely) going super sonic does make sense. That even higher pressure rise from a mach phenomena being an issue makes sense. Instead of the squish sapping power, I would think it would simply cause detonation. I would think that removing the zone completely for when tunning for very high cyl pressures (read - torque) would raise the given det threshold at the cost of low end charge mixing and resultant peak pressure (again read – torque) The above is no surprise, as building or changing something to increase ability at a higher level almost always results in less a sacrifice at lower lowers. The damage on the exhaust side of the piston could be due to the area not having cooler air always coming in, as per the intake side. Most people done have this issue, as they simply tune to the highest threshold of the most weak cylinder. Trying to equalise cylinder conditions across each piston, means of course you can run them hard, so less fuel, more ignition, more boost etc. It prolly translates to more even bearing life, and reduces resonance through the crank / driveline. I could of course be totally wrong, (how ever unlikely mauwaha) but I believe this until proven otherwise. PS: Be sure to search, this has come up before, with more details on the companies that DO remove it, like JUN. Greg from ProEngines has had some input before as well.

Yup, low qual metal substrate cats have been known to fail in hot environments for years. Its not new. It reared its head in the rota community first for obvious reasons. If your going that way, a high qual one is mandatory, SMB, PWR etc etc.

Speaking waste gates, from my limited experience, its the larger diaphragm thats the big plus, not so much the valve size. Go 60mm. GT35 is too big to simply run low 1.5bar boost. Unless your guna push the GT35, get a smaller turbo to get the same power, with less lag. As for power limits of RB25, like a lot of things its tune related. People get mixed results because cylinder pressures caused by det aren't progressive. As long as you can assure a det free environment ALL the time, (v.unlikely for most people) then you can push any motor very hard and only really see normal engine wear, IE rings, bearings. Simply saying your aiming for a tune with low det is pretty meaningless. If your going to push the limits of cyl pressure (so intake heat, ignition advance, AFR's) make sure you do everything possible to prevent ANY det. This could include guaranteeing fuel pump, reg, inj, coolant flow, ECU, fuel etc health. Rem after market head gaskets, forgies etc are more for det resistance, then for handling increased power. A built motor (piston variety at least) will take a bit of cyl pressure spiking, whereas the high strung stocky will bust a ring land, spit a gasket. my 2cents

I was in same position. Either make myself, have my fabricator make one, or buy one. The time to fab a good looking and functional one woulda been about the same as the Greddy "Suction Pipe" (Nengun, Greenline etc) I figured the Greddy one would sell easier when / if i go back to twins... so grabbed the Greddy one. Yes, the cost annoyed me

I doubt it, imports aren't his thing. 1200hp turbo V8's are. I think people are still a little dirty about the news paper "Cbr street drags" fiasco

lol at rev210

Heheh, sure thang girlfriend

Porchetta

BelCompton F_ks

well friend, im not going to doubt your superior intellect, but least try and keep it on track yah. The discussion was on the efficiency of the Gt3076 on a internally stock RB25, and when winding more boost just proves to heat up the charge too much. Keep in mind, boost is air the motor CANT swallow, so 20psi from a 3076 is a tad different from 20psi from a TA45... but of course your an el33t mechanic with lots of experience with these motors... cus your blown so many up, so youd be well aware of this. >> http://www.skylinesaustralia.com/forums/Rb...yno-t55845.html << might help you with your next post on the topic

-20 points for doing math on NY eve Edit: I should prolly post something worthwhile. Those BOV's have been used on cars running more boost then that. The reversion and boost spike your seeing is clearly due to your BOV not opening properly. Check the vacuum feed your using (between TB and motor yes?) Check the BOV on the bench with a vacuum pump maybe? The trick for easy 100% workability would be to use a recirc BOV, not an atmo one... but you don’t wanna hear that Your calcs could be correct, but the way the comp wheel is shaped means pulses can go backwards through it much easier (iv heard) and air ain't that viscous my 2 cents

Nice! Cheers Kincrome for the laughs, its made having to work on NY that much easier Pedo? Darling? wtf Keep it coming. And Jono, worked up so easily

Happy NY kids!! A time of refection, planning and what not Party hard, think smart and drink in moderation *cough*

Big bang

Iv been to every one since #12. Its a lot more civilized these days.. which i guess is a good and bad thing Night time with a import is still hairy, but can be offset by either car or how big your arms are hehehe. A riceless ride that sound off guts and pops a burnout every now and then still gains some attention of the good kind. Having a car load of massive mates (pref looking like ice dealers) helps a lot too haha

Rolling

Sweeet, you've answered your own question Gota love forums