Mazda RX7 twin turbo ( 1990 )

[grinder]

I have seen this car for sale but a little confused about it being a twin turbo

i thought the twin turbo's was only on 3rd gens

will some one please enlighten me !

thanks

stu

[Fish]

Stu, they made a twin turbo just before the FD. It was classed as the Turbo II.

Dan

[grinder]

right then - so excuse me for being thick here !

the next door neighbour has a G reg RX7 Turbo II

so thats a twin turbo ??

so did they do a single turbo !

how can you tell its a twin turbo ??

Im very confused with all this ( as you can tell )

[MikeLMR]

Turbo II's are single turbo's ... its just a name

The ONLY (Standard :D ) twin turbo RX7's are the 3rd gen ones

as for the reason behind the II theres a bit of a debate

Is it because they were fitted with a twin scroll turbo or is it to seperate it from the 1st gen turbo sold in Japan ?

Mike

[Grizzly]

The T2 is a singe turbo, Its the Twin scroll (Divided turbo) it means with the Two bit. Thats why the pre 89 cars where not called Turbo 2's as they did not have twin scroll turbos.

The only Rx7 that was twin turbo'd was the Third gen.

Chris

[Fish]

I sit corrected, thanks guys. :rolleyes:

Dan

[grinder]

thanks guys thats makes sense now !!

Stu

[88GT-R]

Hi,
After all this time, i think i will put a spanner in the works:p Towards the end of 1st Gen production in Japan, Mazda experimented with a production turbo charged FB. In 87 when the first 2nd Gen turbo emerged it was called the Turbo II. In Japan all series 4 TurboII are badged GT-R, whilst all Series 5 TurboII are badged GT-X.
S4 being 86-89, S5 being 89-92. All S4 turboII have twin scroll turbochagers, but not the S5. There are a few other differences between the two, to the body, aswell as the engine.
I hope this puts the record straight.

John
88 GT-R

[hIGGI]

Originally posted by Grizzly
The T2 is a singe turbo, Its the Twin scroll (Divided turbo) it means with the Two bit. Thats why the pre 89 cars where not called Turbo 2's as they did not have twin scroll turbos.

The only Rx7 that was twin turbo'd was the Third gen.

Chris

You are wrong.

Turbo II name came up because in japan there was Turbo first gen. So in 1986 they came up with Turbo II. And u are wrong in twin scroll as well. Only pre 89 cars (86-88 TII) does have twin-scroll. 89-91 does have modified exhaust manifold and turbo and NO twinscroll.

[t2rew]

89 on is twin scroll too

[Grizzly]

:) I've noticed before now the 89- has twin waste gates does that have anything to do with it? ;)

I think the T2 thing is just a name as there was never a Gen 1 Turbo only the Elford kit but i think there is a lot of Guessing going on.

I think the best theory is that it is a Turbo and a second gen so its a Turbo 2.

Chris

[88GT-R]

Originally posted by t2rew
89 on is twin scroll too

Hello,
Sorry, but you are wrong on this one. Twin scroll uses an actuator to open and close a flap inside the manifold. This directs the gases with more force through the primary port on the turbine housing, for quicker spool up. At a certain pressure, the actuator pulls the flap back to let the gasses enter through the smaller secondary port. This is a crap system, as spool up is not that much quicker and inhibits high flow higher up the rpm range.
Only S4 TII have this twinscroll system. The S5 has larger wastegate and flap, and slightly different turbine blades, for increased efficency.

John.

[hIGGI]

Originally posted by Grizzly
:) I've noticed before now the 89- has twin waste gates does that have anything to do with it? ;)

I think the T2 thing is just a name as there was never a Gen 1 Turbo only the Elford kit but i think there is a lot of Guessing going on.

I think the best theory is that it is a Turbo and a second gen so its a Turbo 2.

Chris

Chris u are as well wrong, there WAS first gen turbo sold in Japan (and that was not Elford kit)

[MikeLMR]

definetly a 1st gen turbo ... the elford was just a bolt on effort without the lower compression ratio and different porting of the Mazda version (the turbo 12a was taken from the early cosmo) the 1st gen turbo was also the first car to use the beefier suspension used in our MK3 RX7 and the GLS-SE in the states ...

1st gen Turbo

[MikeLMR]

2

[88GT-R]

Impressive. First time seeing one!

John

[Martiny]

There was 2nd Gen "Turbo I" made, before the TurboII was put into production, though not designated as such.

It was a limited edition made in Japan, for evaluation, and was less powerful than the full production model we know as TurboII.

[Grizzly]

Just put it down to shelterd youth + I've never been to Japan ;)

I'm a bit confused by the Last reply though, there was a First gen mk1 - 3 then a second gen mk4 (that was badged up T2) was the T1 a production car or was it basicly the S4 renamed in japan? Becouse the S4 is less powerfull than the S5?

MMMM i think i'm just a bit confused.

Chris

[88GT-R]

Originally posted by Martiny
There was 2nd Gen "Turbo I" made, before the TurboII was put into production, though not designated as such.

It was a limited edition made in Japan, for evaluation, and was less powerful than the full production model we know as TurboII.

Hi all,
I am sure that this will become a lively debate before long, but... The only production turbo RX7 before the TII, was the first gen model available to Japan only. In the UK, some of the tuners designate the S4 as a "Turbo I". This is possibly to differenciate between the S4 and S5 for tuning purposes.

Grizzly, Hi.. The S4 was badged GT-R in Japan, whilst the S5 was badged as the GT-X.

Cheers,

John
88 GT-R

[grinder]

what have i started :confused:

[hIGGI]

Originally posted by grinder
what have i started :confused:

u started with good question but u got few different answers and have to study little bit on internet and other forums to find out which is true and which is just assumption of guys who never bother to find out...

[fc3sPAT]

regarding the TI and TII issue, i have recently taken my "so called TII" to Geff at portsmouth, basically just asked him the spec of my engine as it is just bizzare when i try to order parts and it turns out they are wrong??

how wrong can it be when my car says TII on the side and i ask for TII??? :confused:

anyway, it turns out i have a TI(S4) block which runs lower compression enabling higher boost, but i have TII(S5) turbo, intercooler, wiring looms etc., all this has enabled me to run 5.5-low 5's 0-60 times, and with a top speed in excess of 155mph.

so, from this i have gathered that the S4 is a TI (as Geff says), and that the S5 is the TII,

how reliable all this is, i will let you decide for yourselves,

Patrick,

[fc3sPAT]

regarding the TI and TII issue, i have recently taken my "so called TII" to Geff at portsmouth, basically just asked him the spec of my engine as it is just bizzare when i try to order parts and it turns out they are wrong??

how wrong can it be when my car says TII on the side and i ask for TII??? :confused: and it turns out that many of the S4 (TI) parts are now non existent now!!!

anyway, it turns out i have a TI(S4) block which runs lower compression enabling higher boost, but i have TII(S5) turbo, intercooler, wiring looms etc., all this has enabled me to run 5.5-low 5's 0-60 times, and with a top speed in excess of 155mph.

so, from this i have gathered that the S4 is a TI (as Geff says), and that the S5 is the TII,

how reliable all this is, i will let you decide for yourselves,

Patrick,

[hIGGI]

Series 4 TII 182hp (lower compression, twin scroll manifold design, one wastegate)
Series 5 TII 200hp (higher compression, no twin scroll but bit better wastegate design)

It does not matter if some Geff calls it TI or T4, its still TII according to mazda and mazda being builder of car should be right.......

Guys, don`t be blind and try to learn bit more, there is tons of sources on internet u could compare and it will easy tell you what is truth and what is just bull:censored::censored::censored::censored:....

:D

[fc3sPAT]

LOL, its just funny when not a single person is 100% sure and they come on and argue about a subject, (including me), :D

and hiGGi, dont come hear and call people blind and assuming everyone here is stupid and you know everything, cause i was just merely quoting what the guy told me, no offence to you, you probably know more then me, but just dont come here and seem to insult others knowledge! :rolleyes:

Patrick,

[hIGGI]

i don`t insult anyone who does not deserve it :D

and i don`t argue about things i am not 100% sure about

after few years of active studying and WORKING on rotary's - specialy FC3S of few different markets (japan, european, us) i know what i am talking about - i feel sorry for you if explanation of really basic terms gets you insulted, but 10 ppl here in thread not being sure does not mean we are talking some hard to prove scientific thing......we are talking TII (TurboII) term which is well known fact which u could easily find out and have it proven from official mazda websites as well from all fan sites and forums...there is really no discussion about this, its just repeating those facts for uneducated members :D

[fc3sPAT]

LOL, dont get me wrong, but if i felt insulted i would F@#in and flaming you by now! LOL :D what i meant is just be careful with your wording,

anyways, i am here to learn more about my car, and like i said, just quoting what someone said, not what i believe in, for all i know is i have a mixture of S4 and S5 parts on my engine that is giving me good figures. i dont really care about TI or TII, just QUOTING!!!! so dont flame me for that! :rolleyes:

[hIGGI]

do you see any flames ? :D

[grinder]

now now ladies - keep it clean :)

[hIGGI]

of course its clean, just trying to help with education :D

[88GT-R]

Originally posted by fc3sPAT
regarding the TI and TII issue, i have recently taken my "so called TII" to Geff at portsmouth, basically just asked him the spec of my engine as it is just bizzare when i try to order parts and it turns out they are wrong??

how wrong can it be when my car says TII on the side and i ask for TII??? :confused: and it turns out that many of the S4 (TI) parts are now non existent now!!!

anyway, it turns out i have a TI(S4) block which runs lower compression enabling higher boost, but i have TII(S5) turbo, intercooler, wiring looms etc., all this has enabled me to run 5.5-low 5's 0-60 times, and with a top speed in excess of 155mph.

so, from this i have gathered that the S4 is a TI (as Geff says), and that the S5 is the TII,

how reliable all this is, i will let you decide for yourselves,

Patrick,

As i said in my previous thread... tuners do use the TI...TII to differenciate tuning parts etc. You guys have seen the photo of the origanal turbo...and that is why the FC3S is a TII.
I hope to see you all over the weekend.

John
88 GT-R