iforged

iTrader: (1)

I am building a project 1994 RX7. The car will be strictly a showcar, but I want to be able to drive it on the street during the weekends for fun. I have been looking at Single Turbo conversions for the last week, and still am not sure what to get. I would like to build the RX7 to attain 500rwhp on 15-18 psi of boost. I am purchasing the Monster V mount and Koyo radiators for Rotary Extreme. I want to run HKS FCON VR for tuning.

Out of these three turbos kits, which would you guys recommend?

1. Greddy T-78 Turbo Kit
2. HKS T04Z Kit 93+ RX-7
3. GT40R Turbo Kit 93+ RX-7 from RX7store.net

What about clutch recommendations??

Are there any other turbos kits that you would recommend? Thanks in Advance

Heisenberg

iTrader: (3)

Seems like a waste to me to dump all that money into a show car.Thats alot of HP to be putting down at those boost levels and i hope you know you cant just slap a single kit on without the supporting mods. I also dont know of anybody using the HKS FCON. I think you need to just do some more research.

But out of the three you listed above i would choose the GT40R. There is a thread on clutches is this section right now so if you need info in that area check it out.

iceman4357

iTrader: (2)

I agree with the more research part. Those turbos are capable of hitting those numbers, but you would have to have a very well ported engine(bridge and large street). search in the single section, there have been many FDs that have gotten those 3 turbos. I personally have a T78.

iforged

iTrader: (1)

I am planning to do the large street ported engine with 3mm apex seals with a new remanufactured engine. I was just not sure which single turbo kit was the best one out there.

z-beater

I think first you need to tell us what kind of show car are you building...monster...or stock looking.

What kind of boost do you want to hit 500 at?

IRPerformance

iTrader: (41)

The f-con is useless for these cars as it does nothing for timing. Its old technology. Go with either a haltech or for more bling a power fc. You could make some sort of custom mount and incorporate it into you interior for a show car. Both of these are excellent ecus.

iforged

iTrader: (1)

Well its going to be a monster for sure. Full fiberglassed stereo in the trunk, widebody, candy paint job, rollcage, suspension. I want to make around 500rwhp at 20psi. Has anyone had experience with the RX7store T40 single turbo upgrage kit?? It looks like I am going to go with the Apexi FC for the ECU.

Here are pictures of my last project car, widebody supercharged porsche
it was only making 400rwhp at 6psi, nothing like some of the built rx7s i have seen on this site.

p4nc7

iTrader: (1)

Nice car. Wanna give to me for a belated christmas present?

z-beater

Out of the three that you listed I would go with a GT40. But that is just me. It has been a long time since I have looked at the numbers it can produce, but there is agreat site where you can compare a whole slew of turbos at different boost levels. Really awesome and great for choosing a turbo.

Personally I went with the af61. I don't think that I will have 500 at 20psi though. Probably close though.

oh yeah, nice car. Why a 7? It is a great platform but kind of in a different league as far as "prestige" goes as a Porsche.

finnicky7

Nice Porsche

Nuvolari

iTrader: (4)

Nice Porsche?

I am sure Ferdinand Porsche is rolling in his grave.

The exterior is spot on but the interior looks a bit "like German rice"

I am just confused you had such a nice "valuable” car spent so much money customizing the interior and then you put Autometer gauges in it ?

If your looking for "show'' quality with some bang for the buck, the GT35r is a nice kit.

efinimazda

iTrader: (29)

Take A Look At That Dish, Is That Like 4.5"?

iforged

iTrader: (1)

Its a 6" Rear lip.

vh8r

Hey iforged it is vh8r. I spoke to you last weekend about selling you my car. Sorry again. ANYWAY. I run the HKS T04z turbo kit on a street ported motor. On 15-18 psi I make between 400 to 450 rwhp. If you want to become part of the 500 RWHP CLUB I either recommend more boost or a bigger turbo with a lot more lag than the T04z.

P.S. Sweet Porsche.

P.P.S Want to race ??????? lol

iceman4357

iTrader: (2)

sweet *** car. Love the outside. Inside i would have done a lil different(if i had money to do it)

Guyver

How laggy is the hks to4z, compared to say the stock twins or maybe the gt35r if you happen to have some experience with those? I've heard that its supposed to have a very linear power curve. At what rpm do you hit full boost?

vh8r

He is my dyno graph. This is at 19psi running rich. Full boost kicks in around 3900 rpm and it still pulls hard through the rpm band. Much better than the stock twins. Instead of two kicks at different rpm s, its just one big one.A very street friendly turbo in my opinion. As far as the gt35r I have no experience with it and after owning the T04Z I don't care to.

venge_x

When does the GT35R spool, and do you need a port job if you get that turbo but keep the psi around 15-18?

iforged

iTrader: (1)

No worries, if I owned your car I would not sell it either. I just picked up a 1994 RX7 for a smoking deal. How much lag do you have with the T04z. I am leaning towards the Aspec Gt35R or GT40 kit, and running the Rotary Xtreme V mount like your car.

vh8r

I like the T04z. Zero complaints. However, I drive my car on the streets regularly and boost comes on at a reasonable rpm. Not sure what the gt40 will do. Anyone of those turbos can get you that dyno number. Full boost on a turbo that size (T04Z) at 3900 rpm is impressive. Lets see the gt40 do that.

Zero R

iTrader: (1)

TO4Z is basically a TO4R both have identical wheels both in inducer/ exducer size and in trim. On the turbine and compressor. The only difference is the compressor outlet is slightly larger with ported shroud versus unported shroud for the TO4R, and it comes in different turbine A/r's other than that it is a TO4R. It spools a couple hundred rpm faster than the standard TO4R as well.

-S-

vh8r

No Zero R you are wrong. For the FD rx7 the T04Z is a 1.00 AR where the T04r is a .86. There is a power difference. The T04Z spools about 1000 rpm faster and will make more ppwer than the T04R. Do you have a T04Z ??? Because I do and I see the difference on the dyno.

moehler

iTrader: (12)

Just go for a GT42R kit from A-spec. It will definitely get you 500+ rwhp at 20psi (if not more ).

Zero R

iTrader: (1)

Excuse me, I am wrong go look up the specs from HKS both compressor wheels are 66.7mm inducer both wheels are 84mm exducer both are 63 trim.

Both turbine wheels have 74.2mm inducers both have 64.7mm exducers both are 76mm trim.

Compressor cover outlet is 10mm larger with anti surge added.

They have different turbine A/r options as I stated, and you were fond to remind me of.

It is BB versus non BB. HKS showed just under a 400rpm improvement in repsonse time to 1bar. Same motor, same car, same power. Only a 400rpm improvement was made.

It also showed under a 2sec improvement in transient response however it was a pointless test in my book. the To4Z had .61 A/r turbine housing versus the TO4R having a .81 A/r. Of course there will be a noteable improvement.


Sorry if you don't like the facts as given from HKS you should tell them they are wrong. The T04Z is a BB TO4R that is it. Do I own a TO4Z ,nope, you got me on that one. But I have held, sized and fitted more GTseries turbos and wheels than you, and physics dictate you will have a better power band because of slightly improved response but you are not going to make barely any more power than a T04R and to be honest according to more of their(HKS) test data after after 7k they made less power on the same motor. I'm sure they've owned a TO4Z but what would they know.


-S-

LUPE

ZeroR is right. We dropped a T04Z off at the Garret distributor for them to dissect, it's the same as a T04R with a ported cover.