Is anyone running twin T-28s on their FD?
 

A local guy has a set of them on his Z32 300zx and claims to make over 500rwhp on pump gas. i know there are some kits out there for the FD, is anyone running them? Looking for trap speeds and dyno numbers :)

Rich, isn't it a little early for an upgrade?? hehe ;)

as always, Rich has a few grand lying around burning a hole in his pocket, and his trusty FD is the gaping black hole ready and waiting to receive it

:p:

LOL...I know, right? I was just thinkin lets get some miles on the brand spankin new BNRs first! lol

No, its not for him.. hes buying them for me.. right rich? *nudge, cough*

That sounds about right.....you need to take about 20% off that for a rotary though.....which would make it about 400rwhp.

Now its not as impressive anymore HAHAHA

Rich, you should do just as well with your current setup

STEPHEN

Ask Brian Nickle what he used on Garfinkles set . Brian may not tell , but they are bigger center sections and large compressor housings

If there are 2 people that would know, they would def. be Stephen & Rich ;)

Didnt Kevin Wymn (sp?) run this set up years ago?

i am gay, stay off my computer homo

This would have to be a custom project, but twin T-28's are actually not that expensive. I got a single T-28 for $400 (used) about 2 years ago. They are the factory turbos for the S14/S15 Silvias in Japan. It's a water-cooled ball-bearing turbo that will spool really fast. The compressor (60 trim T3) is no slouch either. Those turbos (in single form) have made 275-325 whp on the SR20DET that they came on. Put two of them together and you've got some wicked power potential.

How are people controlling them? PFC, I assume?

Sonny

Stephen, check your pm's...

sorry to go off topic... carry on :).

Thanks for the input Sonny.

Oh, I am definitely sticking with my current setup for the forseeable future. No more cash for el FD for quite awhile.

Yeah Stephen, I was thinking 400 to the ground and 125mph traps. Sound familiar :D?

Ah, introducing my roommate Jason "USCC RX-7" Cameroon (which is Spanish for 'shrimp,' i believe :D ). He's just jealous b/c I am going to outrun his dual bb t-66 with my setup, pump gas vs pump gas :cool:

Ahh.. the plot thickens.

You do know that 300ZXs have to run turbos in twins, right?

Yup...there's a T22 on each bank of the V6. We actually looked into putting the Silvia turbos in my buddy's Z32. The problem is that the T28 uses a T3 compressor and T3 compressor housing. The housing is substantially bigger than the stock housing. I don't think it would have been possible to squeeze it in there without some serious hacking of the body. The people that are using T28's in the Z32 (as far as I know) are using the stock compressor housing that has been machined to fit the 60 trim T3 compressor.

For reference, here's the S14's T28 mounted to cast iron HKS Honda manifold (good for about 275 whp).

http://muller.net/sonny/crx/turbo/combo-2.jpg

I sold that combo and replaced it with a Precision SC50 (T3/T04E hybrid good for about 400 whp):
http://www.muller.net/sonny/crx/gotboost3/01_turbo.jpg

It's hard to see the difference in size without seeing them side by side, but the T28 is physically much smaller. The FD's HT12s and the Z32 turbos look tiny compared to the T28.

I think if you made a custom manifold and put one turbo on each rotor, you could fit a pair of T28s in there with no probs.

From a simplicity standpoint, I think it makes more sense to run a big single with some supporting mods to help it spool (ball bearing center section, retard the timing during spool, HPC coat the turbine housing, etc).

Sonny

Lovely! I'd love to hit the road course with a Silvia and a GT28R

we have a fd in aus running twin t28s, each one running seperately off one rotor, i believe it makes 200kw at the wheels off only 0.6 bar.

boost response is also said to be good with full boost around 3100rpm (if my memory serves me correctly)

are these run sequentially?

If they're running seperately, they could not be run sequentially, because they're no longer in the same exhaust stream. Sounds like they're in parallel setup, some call it biturbo. HEns, do you have any pictures or more information on this car?

-s-

lol, didnt see that. I'd be interested in more info as well......

hmmmmmmmm, i have the artical lying around somewhere, if i ever get a scanner ill be sure to pm you guys some pics.

ok, i actually dug up the article, so i thought id clarify some of my mistakes.

it is actually running twin t25's not t28's (sorry) and yes it is running a true non sharing turbo system, each turbo running its own independent outlets off a single rotor, the piping combining before the intercooler.

also the 200kw was actually made on 6 psi which is about 0.4 bar not 0.6 (sorry again.) at around 16 psi (1.1 bar) it is said to generate 300kw at the wheels.

also full boost is achieved at 3500 rpm not 3100rpm

sorry abt the mis-information earlier, i hope this clarifies things as well as provides the extra info that you where looking for.

from this id guesstimate that you would probably see a 30% increase in hp if moving to twin t28's but it may be a bit of a pig on the street with full boost probably not achieved till at least 1000rpm later.

my 2c and i hope this is more helpful :D

Are these the twins here that are for sale??

http://cgi.ebay.com/ebaymotors/ws/eB...category=33742

My setup is two T04E/T3 ball bearing turbos, the second picture below is of a single TO4/T3. Each is fed by a different rotor and combines inside the IC endtank. Keep in mind it's a partial bridgeport motor though with long duration exhaust ports. If you can overcome the additional complications of a twin setup, from a physics standpoint they will outperform a single turbo in nearly all respects except a little extra weight, and as I said the extra complexity err and cost.

Kevin T. Wyum

Ahemm....
.

http://www.project7studios.com/twinturbo.jpg



:fruit: :fruit: :fruit: :fruit:

fdnewb. . . david garfinkle got his turbos from bnr. . . bryan nickle IS bnr. . . SO ,therefore, bryan nickle BUILT david garfinkles turbos. bryan nickle told david garfinkle that the turbos he put togethther were off of "some nissan" and that they "put out 500hp". thats what david garfinkle was told by the builder. . . that that would make bryan nickle the ONE person that would know. ;)

paul

Paul,

1) So, do they really put out 500hp on an FD??

2) I thought this wasn't a custom application for just one customer... I thought it was something Bryan was thinking of making available to others, which in that case I'd assume Rich & Stephen would know about it...that's all.

hey
 

Everybody is forgetting about the rx7 FD3S that was sold in Australia and raced in Bathurst race track against 911 porshes with twin parrallel turbos.

Mazda Australia had to make a production model so it could enter the races in Bathurst, they had two models one SP1 and SP2, im shure about this and the FD3S ran two Hitachi turbos that was originaly produced for the 20b Cosmo.

They had very good results in track racing with good lap times too.

If im not Mistaken the SP2 model won for three years until Mazda dicided to stop racing.

Thats Why Mazda Japan had a Limited edition called Bathurst Edition some of you might have a secand hand one imported from Japan already. the Japan Buthurst Edition was identical to the Efini but labeled and some little extras if im not mistaken.

To get to the Point it was the Australian Edition SP2 that had the Special IHI parrallel Turbos from the 20B motor Plus a very different body kit and carbon Hood painted to match the Body all SP2 where White in Colour.

If it won against the Porshes with the parrallel turbos it was made for a reason and i think the twin turbo setup is the way to go

Just to elaborate on what Power Put said, from the RX7 History page... (http://www.ttrex.com/RX7History.html)

"The 3rd generation RX-7 hasn't rested on the reputations of the prevoius two. 1992 - 93 - 94 - 95 victories in the Bathurst 12 hour endurance events against the best Porsche (open cheque book) racers (944 - 968 - 911RS) & other reputable sports car entries has showed the the world how Mazda's little 1.3 lt rotary engine could outclass the best from Europe & any other country bidding for it's glory."

"In 1997, the limited edition RX-7 type RB Bathurst X was introduced. It is based on the Type RB, and it is equipped with red leather seats."

"In 2001 came the new special edition Type R Bathurst, based on the Type R, the RX-7 with the lightest power-weight ratio. It is equipped with custom height adjustable dampers and fog lamps. The name BATHURST was chosen to commemorate the Bathurst 12-hour car race in Australia, where the RX-7 was victorious for three consecutive years (1992-1994)."

Oh and Power Put, I couldn't agree w/ you more: A twin turbo setup IS the way to go! :D

FDNewbie do you know any more on the SP2 the size of the turbos and how much HP they made we know they are from the 20B Cosmo, but what size,bhp?

Anyone has a 20B cosmo with stock turbos answer this one ?:p:

I don't, BUT I know that the Cosmo twins have smaller compressor wheels than the FD twins, and they're only made for low boost (like 6 psi or something), so I don't know why they'd ever use them. That, and the website didn't say anything about them being the Cosmo twins...

When Pettit makes his Banzai w/ the 20B cosmos, he has the turbos balanced, blueprinted, and ported (or so I've read from my thread in the 20B forum)

FD, all i was doing was saying that the info from the maker is the most reliable. . . rich and stephen may NOT know. theyve never talked about what turbos are on davids twins before. . . just that they are special. . . and about doing that same kit for others. . . i assure you. . . once they see what goes into making them fit "right" theyll have second thoughts. . . itd take a serious "fabber" to do it the same way.

paul

Paul, you're right...I remember now Stephen telling me how Garfinkle got them to fit specifically because he's so good w/ fabbing...and the amount of custom work was incredible.

~Ramy

Dumb question here, but are these the same T-28 turbos that are bolt-ons for 2nd Gen DSMs? I was looking at upgrading the stock T-25 on my Talon to a variant of T-28 so I'm curious...

the cosmo twins are two hitachi units primary is the h12 and the secondary is the h15, to my knowledge

don't get a T-28, go with a EVO 16G or a big 16G


PS. Nice photo shop Huy haha, jk I can't beleive those actually fit, I can't wait to see them in your own car lol you want to put them in mine some time ;) haha

"Thats Why Mazda Japan had a Limited edition called Bathurst Edition some of you might have a secand hand one imported from Japan already. the Japan Buthurst Edition was identical to the Efini but labeled and some little extras if im not mistaken."

the bathurst and bathurst x models are nothing like the SPs. Instead of having extras, the bathurst models actually had LESS goodies than a standard FD - they were actually sold as an 'economy' model, and in most production runs, were significantly cheaper than the rest of the range. The 'japanese SP' was the 1020 M2 - which was prototype only.

I'm currently working on a twin t28 setup. Fabbing the manifold is proving to be quite a challenge. Not much about the turbos yet, but some photos can be had at

http://www.nopistons.org/gallery/vie...ame=fd_project

--jeb

broken93, it looks great. All that hard work will pay off when you finally get to drive it. And since you are doing it yourself then you know its done right.

Thanks for your comments.

I'm just sworn to secrecy on some things haha

STEPHEN

See Paul??? lol. What ppl know and what they're at liberty to discuss are 2 VERY different things...

~Ramy

hey i said "may". hahahahaha.

paul