99spec. twin turbo (information)
 

You all probably know about this but here is a little information regards to the 99spec twin turbo.

I've just got a rx7 magazine from my parents in Japan. On the magazine, they talked about the stock twin turbo on the 280hp rx7 and they were saying that 99spec. twins are not as durable interms of running higher boost than stock level.

So those who are thinking of going for spec.99 twins and have it boosted up like on the old stock twin turbo that would be a "NO NO". They recomend using the turbo which was on 255hp and 265hp ver. of rx7 for boosting up.

*They said something about seal being made out of plastic material causing the turbine to be not as durable as the old turbos.

yes, but they will run longer on stock boost. They can run up to about 12 lbs fine for a good 100k as long as u take care of it. But once u get past that they are gonna croke. I absolutly loved them, they spool early and i get that extra umf early. I have never driven an rx7 with working stock twins since i got mine messed up

I just thought I should let people know before they spend $3000 on a set. I also read that on the S-Race in Japan, they actually remove the 99spec. turbo and uses the older ver. instead, on their race cars.

Inaddition, they recomend the 265hp rx7 to buy, for those of people who are planning to mod. their car with stock twins.

for the high price of those BB twins, I don't understand why people don't go single. I suppose you could still pass smog with them, but not with any other mods... if i was going BB i'd get a single, like the apexi single..

I think that this is good and useful information that RE Suzuki has posted. Knowledge is good--or so they said in ANIMAL HOUSE. Anyway, like all information, it should be thoughtfully weighed into your consideration. Moreover, it illustrates that there is no free lunch when it comes to mods. There is always a tradeoff.

FWIW: My stock '93 twins are pushing 140k miles and continue to boost 12 --> 16 psi with no difficulties. Working stock twins can work pretty darn well, especially if complimented by appropriate mods around them.

The reason why people get those is because you just take the old ones off and put the new ones on; a simple swap. Yes the single turbo kit is $3000 but did you factor in the new intercooler that you will have to buy to support the single turbo ($900+) plus the power fc ($850+) plus the labour to put that turbo in. I know i'm missing stuff like bigger injectors and dyno tuning sessions etc, so you see sometimes its just worth getting the factory turbos replaced if your on a "budget".

R.K.

opps

If your going to go with any twin setup i would recommend going with the BNR stage 3's which are 2350 and are designed for 17+ psi everday. They are direct bolt on replacements and can be run seq or non seq.

Mike

I don't think an oem us ECU will work very well with the 99 spec twins, unless I am mistaken.
Most people upgrade the IC anyways, so I don't see how that is a problem??
If you install it yourself, like alot of people do ... minus the labour cost.
Relativeley it is about the same IMO. with different outputs
everyone wants dyno tuning... even me :)

You've got to pay to play :D

Where can I find out more information on the BNR stage 3's??

"search" :)

I posted similar info about 6 months ago... and no one was interested then :p

I haven't read anything about high boost though. In the article I read (was mentioned in a side bar, actually), they stated that the 280ps turbos were no good for extended periods of use - and they gave the example of endurance circuit racing (reason: the abraidable seals).

as for boost levels - looking over literally 100s of japanese feature cars (FD - from RX7 magazine, Rotary magazine, and the hyperrev specials), it looks like 99% of workshop cars (using either set of twins) run .9 bar - almost as if it was a rule of thumb. A handful were at the 1 bar mark. I can only think of one that was running 1.1bar (but my memory is getting bad...).

I have the '99 RZ turbos, and I can tell you they are a significant improvement in terms of spool-up, and EFFICIENT boost capability. I have a completely open exhaust and a ported motor, and they spool-up like the 93-95's did when the car still had a cat and stock ports. Also, I can actually run the open exhaust safely with these turbos because the wastegate is different, and I don't get any boost creep... even down the long straights on the track.

I can also run around on 15 psi all day, and not see obnoxious temps... roughly equates to the old twins on 11-12 psi... at 14-15 psi, the car is quicker than a brand new 911 Turbo w/ X50 turbos.

p.s. If you think you can go single turbo for $3k, you're kidding yourself. $3k just opens the door.

^^yes, i got the 99' specs because i was on a budget, and wanted a little bigger. 3k barly gets you into single. I love mine, they spool fast and early with a catback, highflo cat, and a stock reman motor. I would love to go single, just dont have the money at 17 :(

I just ordered a set of Efini Turbos I think its the same as the 99 spec. I pulled the old rebuild twins out that only made it to 10K miles. Good think about the Efini turbos I ordered from RX7.com is they are totally new NOT a rebuild. Also if you search on abradable turbo housing they are used in a lot of commercial motors like generators and tractor and so on that run continuosly. The abradable housing are more efficient then that of the old stock twins so spool up takes less exhaust to compress air. Also included are two new actuators for the wastegate and pre-control. Its a direct bolt in swap for $2595.00. There is no other way to get new turbos for less. THis is the best value of any to stay stock.