time to go titanium?

That's awesome, glad the cleanup worked out so well! I'm anxcious to see how the p/s and exhaust turn out! And the diffuser pics! Keep up the awesomeness Geoff!

I would like to see more detailed pictures of that rear diffuser.

Here is the dynochart from my latest round of testing with my RB26 (this was done in 4wd, on UMS's awd dynapacks, previous testing was done in 2wd mode)



this compares the S300P 0.80 a/r to the S300SX w/ 88mm compressor 1.00 a/r

orange: 0.80 a/r S300P, custom machined housing - 17.5psi tapering to 16psi
green: 0.80 a/r S300P, custom machined housing - 20.5psi tapering to 17.5psi

VS

pink:S300SX 88-75 1.00 a/r 19psi
blue: S300SX 88-75 1.00 a/r 19psi (same as above) with slight cam gear adjustment (advanced to +3 intake from +2, and added a little fuel during spoolup)

you can see the considerable gains in area-under-the-curve that i was able to acheive with this new turbo, and very small loss up top - well worth the tradeoff.

now that im all done, considering the amount of work I went through for this and time and expense required to make this S300P work, i think the 83-75 would have provided virtually the same powerband, and fit better as well as be easier to install.


^^this is a customer's twinscroll 83-75 1.00 a/r on our twinscroll subaru kit. I would kill to get that powerband with my RB26..

wow great response with that turbo. im actually looking into the 300sx 88mm..

but glad to see the 83-75 will have a responsive power also.

the psi vs rpm graph is very helpful thanks!

i just wanna say that you are living my dream lol

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turbo2nr wrote:wow great response with that turbo. im actually looking into the 300sx 88mm..but glad to see the 83-75 will have a responsive power also. the psi vs rpm graph is very helpful thanks!

I am glad this helps! Nissan engines typically do not spool as well as some of the other cars we work with - particularly RBs and SRs are very sensitive to turbo sizing. i like to help everyone by sharing my findings and hopefully save them time and money in finding the ideal turbo for the application at hand. getting the right turbo the first time is a real pleasure, and unfortunately something that very few have experienced. Most people find themselves swapping parts into oblivion, spending way too much money, and not getting the right result in the end.

spooled240 wrote:i just wanna say that you are living my dream

thanks a lot, if you are ever in phoenix id be happy to give you a tour! fwiw, this job is NOT easy, crazy long hours and a lot of sacrifice, but can be sooo rewarding. the people ive met, the relationships ive built, and the places ive seen are just incredible. I just wish i could share some of the "behind the scenes" stuff with you guys. maybe one day!

there's a good chance i'll be down your way in september. i'd love to stop in and check out this beast.

how do you think the s300sx 88mm will be on a built ka punched out to a 2.5l spining to 8k. think it would be laggy? im thinking not cause the rb is a 2.6l so its not that much difference then displacement but i know the rb flows alot better then a ka..

man if your ever on the east coast id love to check out the car. it would be a dream to inspect a fully built race car im sure i can learn so much from it

here are some pics of the ATESSA test-jig i built. It is going to a very bright electrical engineer friend of mine who has experience with his own tq split ECU for time attack subarus. The GST subaru runs his system with great results.





cant wait to see what he comes up with - using onboard G sensor built onto his circuit board

turbo2nr wrote:how do you think the s300sx 88mm will be on a built ka punched out to a 2.5l spining to 8k. think it would be laggy? im thinking not cause the rb is a 2.6l so its not that much difference then displacement but i know the rb flows alot better then a ka..

man if your ever on the east coast id love to check out the car. it would be a dream to inspect a fully built race car im sure i can learn so much from it

i believe the KA would spool faster than the RB... keep in mind the RB has very short stroke, so it really isnt great at spoolup. The EJ25 subaru motors outspool my RB26 pretty consistently. I was planning to bring the car to the east coast this summer, but some SEMA plans got in the way of that, so definitely by next summer, the R14 will be living on the east coast

numbnuts just shoot a PM beforehand and we can meet up when you are out here

Hmmmmmm...... I'd would have never thought that stroke length would effect spool up.

I'm quite interested in what your buddy comes up with for the ATESSA controller. Do you know if he is planning something that the final torque splits could be tweaked by the end user?

the converted wrote:I'm quite interested in what your buddy comes up with for the ATESSA controller. Do you know if he is planning something that the final torque splits could be tweaked by the end user?

yes that is correct - a standalone ecu that controls tq split based on the drivers preference (more or less) and can easily be programmed via usb

kouki munster wrote:Hmmmmmm...... I'd would have never thought that stroke length would effect spool up.

i have found three things that will have a big effect on spool for a given engine

-displacement (stroke & bore)
-turbo manifold/housing design
-cams

Ahh, I assumed that you were referring to just the stroke length alone, not the combination of bore and stroke.

Carry on with the awesomeness.

I cant remember where I seen it but in japan theres a skyline with a 2jz bolted up to the rb26 trans. I think that should be next on the list with the R14.

numbnuts240 wrote:time to go titanium?

as far as i remember, titanium can explode if its heated up to a high enough temperature.

ni$$an240 im tryin to get ahold of you to see if u want the full black interior still off my car. u have no email listed or pm alowed. get at me sorry to thread jack.

Ni$$@n240 wrote:I cant remember where I seen it but in japan theres a skyline with a 2jz bolted up to the rb26 trans. I think that should be next on the list with the R14.

blasphemy! would you wear a nike shoe on your right foot and adidas on the left? lol

spooled240 wrote:

Ni$$@n240 wrote:I cant remember where I seen it but in japan theres a skyline with a 2jz bolted up to the rb26 trans. I think that should be next on the list with the R14.

blasphemy! would you wear a nike shoe on your right foot and adidas on the left? lol

hey i do that for socks, lol.

lovin' the car man. so much awesomeness going on.

Getrag unto a rb26 would be hot.... @_@

my dream build right now would be... vq35de with z32 5 speed. reasonably priced and fun... I'd go driving just for the hell of it.

I saw a short article on this project in my modified mag that just came in.. havent read it yet though

you guys all bring up excellent points - and that is what we are discussing for the new car - the R14.2 - i would love to get your input, as this is what is possible for us to do:

option 1 (Will probably do this): midmounted RB26/28/30 (crank pulley moves back 8 inches from current) , 6 speed R34 GTR trans, full-race twinscroll t4 turbokit, single twinscroll turbo, exhaust vented out the hood "upside-downpipe"
^^^ + http://www.skylinesaustralia.com/forums ... 15420.html

option 2 (not really feeling it, although i dont deny the benefits: midmounted 2JZGTE (crank pulley moves back 10 inches from current), 6 speed R34 GTR trans, full-race twinscroll t4 turbokit, single twinscroll turbo http://gtrusa.blogspot.com/2007/12/2jz- ... -gt-r.html


option 3: midmounted VQ35 (crank pulley will move back 12 inches from current), hybrid G35X transfer case/diff and probably an R34 GTR trans or a vq 6speed with gtr transfer case adapted on, twin turbos. would probably do this with a 350z/g35 tho -- ala http://www.pbase.com/damond/making_of_jun_z33


this will be an all-out race car R14, no street use at all. discuss! and plz no flaming or Off-Topic noise! im really torn between VQ and moved back RB

wow alots of crazy decisions to be made..

personally i say go with the rb30/26 conversion.

the vq is nice and new but some thing about a open deck block doesnt seem to good for what you plan on. i know you can sleeve it but idk..

stick with the rb and move it back and lower as described in option one and it will be golden.

p.s. this time make her a kouki ;-) so moat exceed wont have sh*t on full race lol

i don't like the way VQ sounds, inline 6's sound way nicer IMO

rb30

high rev/ high compression RB20 with ITB's

Hmmmmmmmmmmmmmmmmmmmmm...

You all will probably throw stones at me for saying this, but I'm going for the lowest-weight-possible options that can deliver decently high hp.

- LSX Fully tricked the 'eff' out and naturally aspirated to avoid extra weight with turbos and whatnot. 500-600whp ground-pounder with enough torque to destroy worlds at 1500 rpm.

- 13b/20b turbo with all the good stuff like alchohol injection and an inconel turbo manifold to keep it from nuking itself.

You're already suggesting building custom/hybrid transfer cases and diffs so I had to throw those out there.

v8 with awd would be fun

I'd personally go with the VQ. It's newer, more plentifully available, and is starting to show up more frequently in S chassis. Probably a good way to develop products for your business too.