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