Freebaggin

Not likely, Tim (RPM) and Shaun (Boost Worx) say it's not the issue, plenty of experience with 0.6 odd exh housings and big power. Grepin has 0.68 A/R exhaust with smaller wheel dimensions, mine is 0.63 with bigger exh wheel so overall exh housing flow would be similar. Have a look at Busters's setup compared to mine (thanks Buster real nice setup for sure)! His has all the trappings of high rpm power, I have all STOCK stuff, just with bolt-on turbo (did this on purpose to see what I get with simple bolt-on). Grepin has Greddy plenum, nice exh manifold, big throttle body so it makes sense they have good top end as well as mid range. However just now I had a look at my setup and I think along with possibly a "mechanical" flow restriction it might be boost drop-off at high rpm due to two things. Just discovered my e-Boost EBC was not setup properly and the boost "sensivity" was too low, this has the effect of dropping boost at high rpm and also too much boost in higher gears (which I have noticed). I will fix this. The other thing is the stock BOV might be leaking above 12psi or so. There is a thread in this forum on this very problem, there is a "bleed" hole that can be plugged...I'll do this as well. Then I'll see what I get on the dyno, hopefully all tomorrow, will datalog boost map with Microtech and laptop. I don't think we are getting off the track here are we :headspin:

Good stuff Buster, huge but nice power across revs, what else do you have hangin off motor? Thanks Sydneykid for recommendations. Grepin and I will be gettin on same dyno in the next few days to compare, this is different speed shop/dyno again, but it doesn't have latest software, so no shootout mode. The same speed shop will have replacement 650kW dyno soon with latest stuff so will redo again in shootout...particularly when I sort out the flow restriction and whip Grepin's ass!!!

You too mate, have a good '04 and see ya in Adel or Melb!

I have been upgrading my R33 GTS-T along with Grepin however I have GT30/40 internal gate Garrett hybrid. With conservative tune it has 253rwkW at 1.15 bar, with stock inlet and exh manifold, stock throttle body, stock cams, no cam gears. 550cc injectors, Microtech, FMIC. I plotted Grepin's, mine and JMS 300rwkW dyno on same chart, interesting results, similar to what Sydneykid was saying about average power over rev range. I am looking to increase power over rev range with mine, particularly top end, options?

Yeah that's the one Enrico, the loom plug. Steve, it was very involved and highly technical . We used stuff called Black Insulation Tape (this is very expensive nuclear radiation proof material, only available from the US Defence Dept.!) and stapped it up around the edges. It only became apparent when we did the Microtech plug in.

With R33s at least, the plastic ECU connector can warp under certain conditions and some of the connections come appart. Mine was having intermittent fuel pump probs due to this (a relay connection) and when we reinforced the connector it has been fine for over a year.

The HKS 3037S or 3037 has a 60mm large and 55mm exducer diameter, exactly the same as the GT30 series Garrett, again, it's all on http://www.hksusa.com/categories/more.asp?id=1092 The 84 refers to trim (which is small diameter squared divided by large diameter squared x 100). Plenty of Garrett sites to confirm numbers. But anyway, it's all gotta add up to less turbo response at low RPM...lower comp ratio, larger duration cams (particularly exhaust), larger A/R exhaust housing. As we know things get magnified on turbo engines and are cumulative. Really the only thing that may have helped broaden the power range is the increased cam lift. GTS-T VSPEC, What boost are you running to achieve that power? I assume you are runing stock pistons as well. I have GT30/40 with stock exhaust manifold, internal wastegate, stock head and pistons. I have 253rwkW at 17psi with 15° timing and 11.8 a/f ratio and want to start pushing it harder and need to go the next step. Steve, great thread, good on ya for opening up discussion.

Looking around the place I see that different series RB25DET motors have different head arrangments with different valve clearances, cam specs and lifter types (i.e. lash/hydraulic or solid). Why do some head arrangements have valve clearance of 0mm and others have for example 0.45mm? What is the cause of this? Thanks.

Interesting stuff. Steve, i thought you were going for 264°/9.15mm HKS exhaust cam with the stock inlet? What made you change to the 256°/8.8mm? So just confirming the changes you made from 256rwkW @ 1 Bar (with broad spread of torque) to what you have now: *exhaust cam change *greddy plenum *0.87 exh housing *1.6mm gasket Good luck with next stage. You might be right though, good 3L setup.

Blackwood Tyrepower have good setup I think, heats up paint to enusre it doesn't crack etc. Not sure about guard pumping though. Ask for Craig.

Thanks all. Enrico, nothing specific just yet. Steve, thanks for the info, and I pretty much agree with what you said re knowledge and service. Thanks for the other link and yes, Greg did tell me how much you paid and it was sweet FA! Anyone else with any experiences with both these suppliers?

Anyone tried both for engine/turbo parts and noticed much difference in the way they do business? Prices, parts knowledge, HiPo parts contacts, speed of delivery and general professional conduct? Thanks in advance.

sidewaymambo & B-Man, that would be excellent to do a flow test in the same way on the standard plenum. As we know, a number of guys have problems with no 1 and no 6 cylinders (possibly due to fuel reasons as well) but to have the baseline flow data would be excellent. grepin, if you read this you should invest in flow testing your Greddy plenum whilst it is still off the motor.

Garret equiv....I think: HKS = Garrett GT2530 = GT25/T3 (446179-0030) GTRS = GT25/GT35 (446179-0031) GT2835 = GT25/GT35 compressor (446179-0030), GT30/T04S turbine (700177-0010) GT2540 = GT30/T04S compressor (700177-0010) with GT25/T3 turbine (446179-0030) Should be able to mix and match (just like HKS )

Sydneykid, You mention, ..."until they (HKS) move up to current generation turbo technology"..., does that mean other manufacturers are using newer generation turbo tech. than HKS? Who are they? Is for example a GT30/40 CHRA from Garrett current gen. tech.? Cheers, Freebaggin

What are the dimensions for the 34 row cooler? I'll call GCG otherwise.

No they don't, all Garrett GT30 turbos and higher are T3 exhaust flange. The HKS GT3040 turbo uses a GT25 flange. Some HKS turbo come in T3, some with GT25, check it out here: http://www.hksusa.com/categories/more.asp?id=1092 For those who care, this is the difference between HKS GT3040 and Garrett GT3040, HKS just Garrett parts mixed up in various combos, with proprietary housing designs: HKS: Rated at 500hp * A/R 0.70 comp housing * 50 trim compressor wheel (58mm/82mm) * A/R 1.12 exhaust housing GT25 flange * 84 trim exhaust wheel (60mm/55mm) Garrett: Rated at 550-600hp, depending on exhaust A/R * A/R 0.7 comp housing * 64 trim compressor wheel (61.3mm/82mm) * A/R between 0.82-1.06 exhaust housing T3 flange * 84 trim exhaust wheel (60mm/55mm)

The main reason for bigger sump was as a substitute for a cooler. I've assumed that the bigger oil capacity would be enough to give the motor a bit of protection during the occassional hills blast and track days. I have also assumed the big sump would be much cheaper and simpler than cooler setup. So RB26 vs RB25 oil pressure issues are simply due to - exit corner G force with GTR vs GTS-T or - some inherent design fault or - 1k higher RPM limit with RB26s???? If the standard sump is OK for my next step, bigger turbo and therefore higher RPM use, maybe up to 7600rpm then I won't worry about it. By the way, are RB25s OK for valve bounce at higher boost & RPM?

Cheers Steve and co., I will look into it and let you know.

Grepin, yep that's right and hence the reason for this post. Does Mick do custom oil sumps for RB25s? Ronin 09, thanks for the link, $900 is bullshit.

Does anyone know if you can buy a big sump for RB25DET off the shelf? Also any details on volume increase, windage trays, pics etc. would be great. Ta.

Have a safe one!

Gouger Street Bridgestone in Adelaide CBD, sorry don't have his number but will be in Whitepages on line. Guys, please keep this info to yourselves in terms of trying to get other Bridgestone stores to match as they won't and might get Laurie in trouble with Bridgestone head office I assume. He asked us (the local SAU and SVD guys) not to ask other stores to match, so if he doesn't get in trouble then he'll get us all cheap tyres forever. Anyway give him a call, he might be able to help out, but sending stuff interstate might not be his cup of tea.

Sorry KamikazeR33 I was responding to Clint32. Yeah, I reckon the RE55Ss would be better for wet conditions as guys here have trouble with RE540Ss in the wet unless they are super hot or road goes from dry to wet. Otherwise too dangerous. So I'd never put RE540Ss on front unless you only drive when dry. Best if Chris32 gets on here and comments when he has had week or so and with real wet days as he drive his car to work daily. Unbelievable price but it's the first time Laurie has sold a pair so he's using Chris as a bit of a test. Should drive over and get them off Laurie! Best price in the country He has a huge turnover and all the car clubs go to him as well as race teams, so his customers wear out tyres alot:burnout: Both are road legal.

Still selling RE540S so you still have the choice. Not sure if you've met Greg, but he has 265/18 RE540S's on his R33 and they are awsesome as well, but I think you have used them yourself, correct? Laurie at Bridgestone has unbeatable prices, nation wide I reckon, so other semi-race stuff like RA-Is or DJ-01s might be better (I dought it) but no where near the (cheap) price of RE540S and now RE55S from Laurie. Go for it mate! Reading the Jap Bridgestone site I think the RE55S is better for everythign but particualrly wet grip so good for combo driving like you want. I'm definately getting them when my turbo goes on and my current rears are fried! Hmmm, I wasn't going to Drift day but if the kit is ready then would be a double incentive. Anyway, no rush, cheers.