porschephile

Just thought I'd chime in. I have had the same exact problems with the 044 pumps on my Porsches. After lots of trial, error, browsing the internet, etc I finally determined what was causing the fluctuating whining is heat related. I'm not saying this is necessarily the problem for everyone experiencing similar issues with these pumps. Both of my current Porsches have external pumps, and they are mounted in areas that receive poor cooling and limited airflow. I have noticed with mine that, sometimes they will be relatively quiet and consistant, but usually they start to whine a bit louder and sometimes in a fluctuating manner after I have been driving either car for an hour or 2 and especially in slow/heavy traffic. Voltage fluctuations to the fuel pump are another possibility as well.

My friend has an R33 Gtst w/ a HKS gt2835 Pro S. It's a stock motor, stock cam, etc and only has a metal headgasket (1.2mm I believe). With a PFC it was tuned conservatively to 378rwhp @ 18psi (on a Dynojet), which is about 282rwkw. This was with an extremely crappy manual boost controller that wouldn't hold more than ~.8bar above 4500rpm. From what I understand, the 2835 pro S is most efficient around 20-24psi. I'm judging that there is at least 30-40+rwkw still there with a little more boost and proper electronic boost controller to hold the boost. I'll see if I can get ahold of the dyno chart and post it.

Oops, erased my post. Yeah, you could put a screamer pipe on an internally gated turbo, but it's a little harder since it is so close to where the exhaust turbine is. I'm curious though if you had screamer pipes on twin internally gated turbos, if it would be quite as loud as a large single w/ an external gate and screamer pipe.

I was curious of everyone's opinion on using a single HKS gt3040 or gt3240 on an rb26? I don't think anyone has really tried it, considering those 2 turbos are usually only used as twins when it comes to the rb26. I am putting my Rb26 in a project car and was considering going single. I have considered the following upgraded twins: gt2530, gt-ss, gt-rs. I am only looking for around 500rwhp at the most. I realize twins, single or pretty much any turbo upgrade on an rb26 w/ the mods I will have will easily meet my power goals. However, I am starting to like the idea of a single setup since it will simplify and eliminate lots of plumbing and make my swap that much easier. I've searched this board, SDU and other Skyline boards but haven't found much when it comes to the 3040/3240. My main concern is will either of them be restrictive on the top-end? Anyone have any comments on lag? I saw a few posts by people with rb25's using a gt3040 or gt3037, and they seemed to be decently sized for the displacement. I have considered larger HKS turbos (I'm obsessed with HKS!) like the To4s and to4z but, that's too large and would have too much lag considering my power goals and platform (2k lb 240z).

Well, the reason is I am obsessed with HKS! Seriously, I just really like HKS and their products, and decided I am going with an HKS turbo. I know there are far cheaper turbos with similar or better performance (like Garrett), but I want HKS. Call me crazy. I have considered the 2530's and I do like them. They seem to provide the best all-around performance for low-end, top-end, reponse, etc. I plan on building another Rb-Z in the future, and it will most certainly have 2530's on it. However, right now I really want the single turbo "sledgehammer-in-the-chest" acceleration. As for displacement, I do realize the .4l difference and how that effects everything. Though, I was just going by 2jz to4r dynos to get a general idea of what I am looking at. The to4z being DBB and rb26's higher rev band then the 2jz's will definitely help compensate. That link didn't work for me. Any idea why? I see it's a pdf, and I would definitely like to take a look at it.

Like the title says, I am looking for any info anyone has on the new HKS T04Z. I searched this whole board and read every post regarding the t04z, and I've searched about 5 other boards related to my specific application (rb26). I haven't found much info. I was curious if anyone here has any experience with it or might happen to know where I could find more info. I even searched google and mostly just came up with some Japanese websites. The main thing I am concerned about is lag. However, looking at mk4 Supra dynos w/ the t04r (thanks t04r.com!), and considering the t04z is a DBB turbo w/ almost the same specs, I don't think lag will be much of a problem. I'm thinking of going with an exhaust a/r .81 out of the 3 different ones available. After researching for quite awhile, I've narrowed down my turbo options, and this is one of them. I love HKS turbos, so I am going to go with one, even though I know there are far cheaper turbos with similar performance. I do know the to4z is dual ball bearing and good for ~700hp, which more than meets my power goals. I'd like to ultimately have ~500+rwhp at the very most. I wouldn't run at that power level very often, but I'd still like the capability of doing it whenever I want to. I had considered the T51r KAI just because it's an awesome turbo! However, that is too much turbo considering my power goals. I had also considered the Nismo N1 turbos, HKS gt-ss' and gt2530's but now I'm leaning towards going single to really simplify the turbo setup and cut down on plumbing, piping, etc. I've also considered the t04s and t04r however the price difference between these 2 and the t04z isn't too much, and the t04z seems to basically be a DBB t04r anyways. I want to cut down on lag as much as possible so I like the idea of the t04z. Any help anyone can give me is much appreciated.

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