Lithium

Man, a PE RX6R on a GTR - that'd be bling!!!

^ On a T04Z?

Are you running an RB30? 1bar at 4100rpm isn't that bad Strictly speaking the GT4088R isn't really a bigger turbo than the T04Z, the T04Z has a bigger compressor which wants to flow a bit more air - the Supra guys in the States and the UK seem to be increasingly moving from the T04Z to the GT4088R as the fun 700+ish turbo to have, the GT4088R is apparently more useable and generally fun. Look forward to hearing how the GT3788R treats you, I've never heard of one used on a petrol motor.

Yeah had noticed that, thats very cool - if these options were around (and I know what I know now) when I first bought my GT30R I'd have quite a different setup now. I drove the Skyline to work today and realised I cruise around everywhere in 50kph zones in 4th gear, and 4th gear accelerates me cleanly from 50-100kph - anything above 60kph and I build enough boost/torque to pull harder than the rest of traffic.... enough so I wouldn't want to lean on it if there was a cop around. It really definitely is quite useable, I'd love to know what a twin scroll .82a/r T3 setup would drive like!

Yeah of all the GTRs I've been in set up to make in the low 300wkw range, the one running GT-SS was definitely the most responsive - I was very impressed. As for higher power levels, GT3582Rs are quite noticeably better than GT2530s etc imho

Thats a very interesting change to make - what motivated that, and what are you hoping from it vs the T04Z? Are they both T3 flanged? I've often wondered about the GT3788Rs but not been too sure on what to expect... a comparison I've always been very curious about is the GT4088R and the T04Z.

Cheers for adding to that Mr Rice It reminded me of one of the sensations I have going from my car to a stock turbo car and back again. That "needing more throttle, but getting the 'go'..." sensation feels back to front when you go from my car to a stock turbo car. When driving my car around, it feels to me like it does what you want - you give it half throttle, and it tries half hard. You give it full throttle and it gives you everything. If I jump into a "healthy" stock turbo setup, I am initially pretty impressed at low rev/low throttle behaviour - but then give it a bit more and it feels like it doesn't give me the extra bit of go I would expect for the extra bit of throttle. To me, driving a stock turbo car (even below 4000rpm) it feels like going from 30% to 50% to 75% to 100% throttle doesn't give proportional increases in acceleration - like 30% feels like its going to be quite interesting then you go to 50% it tries harder, but not quite as much more as I'd have expected, so go for 75% and I almost feel like something is wrong with the car so go for 100% and its extra effort feels like a token more than committed effort.

I find this a bit of a crazy question, its naturally quite a bit flatter than the stock turbo if you are pulling from low rpm and low loads - I'd hope you aren't disappointed to hear that because that'd be crazy. Any other turbo capable of over 270wkw is going to give you compromises here, too! At anything over around 2000rpm and what I'd call "load" the motor will start making positive, just not as much as the stock one. I haven't specifically tested the things you are talking about there - for what its worth its not conspicuous enough that anything has stuck out. I do know I can cruise at 80kph up a hill in 4th and then if I wanted to overtake I'd be able to lean on the throttle and it'd start picking up quite happily. I do use 5th up some 80kph hills... 5th gear up a hill at 100kph isn't a problem either, though going up said hill you aren't going to get much acceleration at 1000kph if you decide you want to pick up some more speed. The stock turbo is quite fun for blatting around town, I do remember it but I don't feel short changed by not having it - it just completely changes the nature of how the car drives etc. The stock turbo was a bit boring to drive, and everyone who has had a stock turbo R33 (From what I can tell) seem to find it huge fun in general. The car is an animal for overtaking/pulling out etc, its much more rewarding overall to drive than a stock turbo - I have let a couple mates who have stock turbo RB25s drive my car and have had no complaints about the lag down low, it more than makes up for itself and in ways it really just makes the car feel less like a shopping car and more like a high performance thing. Its worth noting the comment earlier by the guy with a stock twins RB26 - the car has less lag than a stock GTR. When you take into account the car is over 100kg lighter than a GTR, and no one complains about the driveability of those - you'll realise that it seriously is a really good street setup.

While I can think of singles that would do the same thing, I don't see the point if you already have the GT-SS which are pretty much perfect for the power level they are good for.

All good, my pleasure Glad it seems to give what you were looking for, you can tell the "doughiness" below 3000rpm I have mentioned in the past which I don't find bad to live with at all - you get the "warning" whistle just before 3000rpm and if you are still on the throttle by that point you better mean it haha. Cheers for the comments, I am quite happy with it - and as mentioned in the past... I've not had the boost control at a point I am confident enough to lean on the tune so its running quite soft timing until I get that sorted out and put it on the dyno. Its got heaps more in it!

OK, as promised - had a mate driving the car for me and I tried to explain to him what was needed... might be a little rough but should at least give a better idea than trying to explain it. Hope this helps <edit: Oops, uploaded the unedited version first - my bad>

OK now you have said that, it doesn't look so bad - hard is of course relative. Mine is definitely giving a push in the back by 3000rpm, not full boost but you know that if you leave your boot in it you are going to end up picking up a lot of speed quickly. I *MIGHT* get a chance to go out shortly and do those tests for you...

Pass, most people I know have had a bit of a gain when changing exhaust. From memory, stock R33s I have been in run 5psi stepping up to 7psi with stock exhaust and 7psi stepping up to 9psi with full exhaust. 7psi flat if the boost solenoid is eliminated...

Moving further OT but its alarming how much that rant is something I could have said if I hadn't restrained myself. An R33 and an EVO 6 (or even better, 9 for me) in the garage would make me pleased.

I have a large can actuator at home already I am just waiting on my flatmate to modify it for me so it will sit right on my turbo so hopefully it should be done sometime soon. One of my friends was in the US recently and grabbed it for me while over there, shipping = free haha.

LOL good thinking I will have to anyway, as I have been holding off doing a proper dyno tune on the car until I am content with the boost control. I'll have to take it for a blat and see if I can stabilise the boost curve, and if so it will be on to the dyno to get the tune refined - would quite like to knock that 300kw mark.

I am sure I can try that too though heed my disclaimer that I still don't have a big can actuator on the car, and the boost curve is a bit eclectic

Hmm I don't know you are targetting the right kind of car with those gears and speeds - EVOs run shorter gears targetted for those kind of speeds, and the STOCK EVO turbo setup targets those speeds as well.... a GT3076R targets much much higher flow levels than a stock TD05 so even on a bigger motor its a pretty cruel comparison haha. I can guarantee you now a GT3076R (or GT2835/GT3071R) will not compare when run on an R33 at those speeds/gearing. I'd say even a stock turbo will be a bit lazy from 50kph in 3rd! Either or, I'll try and make a vid in the next couple of nights or so including: 1) 30kph, stand on throttle in 2nd 2) 50kph, roll on the throttle in 3rd 3) 80kph, roll on the throttle in 4th My car is a completely bone stock RB25DET, stock exhaust manifold, stock intake manifold, a generic "cheap" intercooler, runs a .82a/r internally gated turbine housing which still has the "soft" spring they are supplied with. This won't effect the low down spool, but does end up with "messy" control of when it hits full boost which from what I can tell isn't that relevant to what you want anyway - as you appear to be worrying more about response/building boost than where exactly it hits full boost. The numbers I show SHOULD be a worst case for a .82a/r GT30R, with nice manifolds/cams/boost control (ext.wg) it should only be better

I don't have my big can actuator yet, but I do have an AVC-R - if you have any tests you would like me to do which show rpm/speed/boost level I can try and get someone along for a blat with me and film the screen doing whatever pulls you would like to give a rough idea?

Awesome! How is the hunt for the record going? Here's a teaser I shot on my cellphone on Monday of the current holder doing a burnout before his first run with the latest changes to the HT GTR, they did 3 runs on "low boost" at Taupo, NZ. Hopefully one way or another the record gets a nudge soon! Good luck

I don't agree, I am personally not a fan of the .63a/r GT3076R - WMI is "cheating" when comparing with normal outright pump gas results. Has anyone tried a GT3071R with WMI? Imho, if you want a bit more response than a GT3076R and aren't worried about making less power then you should just got a GT3071R... the inbetween is probably not worth it. I've had a .63a/r GT3076R, and had first had experience as to what its like having a hot side which is restrictive for what you're doing and in my opinion the slight bit more zest below 3000rpm is well not worth it. Above 3000rpm I reckon you'd be doing well to tell the difference between the .82a/r and a .63a/r. Another thing, the T4 twin scroll 1.06a/r GT3076R is available now... best of everything imho

Sorry, I'm trying to establish what you are trying to determine - you mention spool but it sounds more like you are trying to work out why you are knock limited when trying to add timing at 18psi of boost? I assume you are road tuning? Bare in mind not all things are equal with different cars, an obvious which would apply to your example would be turbo choice. If your car is experiencing high exhaust manifold pressure then you will be able to run far less timing than if you have no major restriction on the hot side. Same would good for good intake charge quality (good intercooling, not maxed out compressor, WMI etc...). I have no AFR graphs for my car printed, but am targetting similar afrs - ranging from Stoich at very light load to around 11.6 at full (17ish psi on an RB25 running a GT3076R) boost.

Hi All, Yesterday at Dragmasters in NZ Glenn Suckling piloted his "Red Baron" R32 GTR to the 7s pass he has been chasing for years! He ran two at the event, the fastest of the two being a 7.92 @ 180mph. Here is a vid of highlights from the event - one of his runs appear at 2:12:

I've never thought of the GT3076R as any other than linear - do you guys given them as quite snappy?

Whats the spool like?