1999 spec turbos
 

Quick question for those have bought these. How many fins did they have...both inlet and outlet? I just bought some brand new turbos, supposedly 99 spec turbos off the RS, they have zero miles on them and look great but can't tell what set I got.

Tim Benton

Re: 1999 spec turbos
 

Hey Tim,

I am going to need some new turbos soon. If you don't mind where did you get 'em and how much did you pay. I don't want to go single, and I don't want to fork out way over $3K for the hi flow twins

I got my set from Jesse Lau, seller extraordinaire from Japan, who has things on E-bay and the parts trader. I got my 99 spec rims from him and e-mailed him to see if he had any way of getting me a set of the 99 spec turbos. I happened to time it right, a shop he frequents had a brand new set that were to go on a car, car got wrecked, turbos sat....Jesse picked them up for me..but the price can't be releaved:) Lets say I felt comfortable paying the amount I did for the.
Mazda comp is 2700 to 3100 or so I think the last time someone called.
Tim Benton

I recall jesse asking ~$2300 for that set of turbos. Try getting a before/after dyno plots. It'd be interesting to see the spool characteristics as well as power differences :)

Re: 1999 spec turbos
 

I was wondering the same thing when I got mine! But I'm not sure counting the blades is the way to tell... I was satisfied when I saw the black abradable seals in the compressor housings.

The old turbos had a 9 blade 51 mm turbine and a 10 blade 57mm compressor. The only changes I've seen for the 99 turbos are the abradable seals, reshaped blades that flow more, and a reduction in turbine size to 50mm. http://www.rx7.net.nz/newrx7.htm

Congrats on the new turbos... you are going to love the spool up time. On my car - it's less than a second to full boost at any RPM in any gear, but this my be influenced by my other mods.

Scott

Scott,

Thanks for the reply. I searched and found the other threads dealing with these turbos, but nothing said about the number of fins or anything else. I do see the abradable seals in there, and as I would turn both wheels on the turbos, I would feel a small scraping sound, I guess thats the fins making sealing themselves with the abradable seal.

Tim Benton

you arent happy with the high flow ball bearing turbos tim? please post your personal opinions on the differences between the feel of the two.

I don't have hi flow ball bearing turbos. I do have a set of SR hi flow turbos, twin upgrade. At the time, I thought they looked great, not knowing what I got quality wise, but I'm always worried about anything used, built or rebuilt. I decided to sell those to a forum member, once he got them, his shop is pretty certain that one of the turbos has a little to much end play. Thanks to Fritz, I didn't install them on my car myself when I had bought them and found out the hard way on the end play. I'm sending those back to Ray, and got the 99 spec turbos with no miles from Jesse.

Tim Benton

Hi Tim if u don't mine how much did u pay for the 99 turbos from Jesse? I am looking for a set too but everytime I email Jesse he never have in stock.Anyhow I am glad that u got hold of one, maybe u can post some more detail on it or compare to the stock one.

Try reading all the posts since that question was already answered.

can someone pm me the email to this jesse person? i'm interested in 99 turbos.. and anything he can get from a japanese junkyard.

I see the 99's have 15hp more than the 93(rx7). Is this all attributued to the turbos(99 turbos produce 15 more hp than our 93-95)? If so, can the 99's be upgraded, like the old units can? Or will the seals be messed up and have to be replaced(and is this a problem)? If, the 99s are 15hp better, what happens when boost is increased and bigger Ic/fuel etc? Will the difference always be 15hp or will the gap widen, because the 99s are more efficent(does this translate to better able, than 93-95 turbos, to handle the higher boost levels)?
If for example, I am running my 93-95s at 14 PSI and produce say 340hp(just random), with all the bells and whisltes needed to operate at this level, will the 99s produce 355 or perhaps, more?

Not sure if anyone knows these answers, but I am curious.
Thanks,
Steve

here is my speculation on this...
 

Mazda says the increase in peak power is due to an increase in the boost level. (due to a more efficient design and the reshaped turbine blades, etc.)

My understanding is that people upgrade the 93-95 turbos to put in higher flowing turbine blades - the 99's already have this from the factory [Hitachi] so there is no reason to upgrade them. To me, the whole point of spending the money on the 99's was that I wanted NEW turbos, I personally just don't trust those rebuilding shops to make a set that will last as long as my stockers did (over 100k miles).

Don't forget that in Japan the 99's also work in conjunction with a revised intake that is seperate from the IC duct, a updated Y-pipe which we all refer to as the Efini Y-pipe, a revised catback and no precat. I'd be hard pressed to say that it is just the turbos that are responsible for the increase in peak power by 15hp. The increase in boost is probably partially due to these other things (which really results in 280hp instead of the US spec 255hp). I think it should be noted that the real difference in the 99 turbos is that they build boost faster than the 93-95 turbos, giving you more power across the whole RPM range that you really notice on the street. I don't have a dyno plot to prove this, but my butt dyno tells me that there is a serious (25+ ft.lbs. with my mods) increase in low end torque over the 93-95's. Mazda says there is a 15 ft.lbs. increase in torque at 2500 rpm with the stock setup.

No, its not that simple. But theoretically I'd say you will see more total power (hp and torque) with the 99's at 14psi than you would see with the stock turbos at 14psi with all the bolt on mods being the same. The reason is the faster spooling at the low end, and the reduction in heat of the intake charge. Mazda says that the abradable seals in the turbines and the reshaped blades result in a reduction of temperatures of 10 degrees Celsius (18 degrees Fahrenheit) at the compressor outlet, even at the higher psi! If you can take advantage of these lower temps with better tuning, then you will make more power. (Remember that the FD by design uses extra fuel in the intake charge to cool the combustion chamber.)

All technobabble aside, I'd guess that the 99 turbos could be run at a higher psi than the 93-95 turbos before they reach the limits of their efficiency from generating too much heat. Don't know what that limit is myself because I don't intend to reach it. If anyone wants to run that much boost, they should definitely just buy a single turbo.

Scott

Scott,
Thanks, thats what I wanted to hear. I still am not sure what I want to do(regarding turbos). But, I am gathering all the info I can. I kind of want to do something different, just to say I did. :)

Steve

hey, i just noticed, isnt the difference between the two 25 hp?

I guess it is. But I was going from the Japanese webpage on the RZ stats(this might have been the diff between the 01 RZ and other 01 Rx7s, so perhaps the 99's do have 25 more than the 93-95). It was comparing 265 to 280. But either way, it is from a combo of things and not just the 99 turbos(which I thought). I was just trying to get a picture of how much beter the turbos alone were.

Steve

so where can u buy a set of 99? all i can find are upgraded/rebuilt stock units. i guess the 99's just bolt right up?

You can get 99 spec turbos from several "grey market" channels as well as from tuners.

http://www.srx7.com/sr93trbo.html (half way down)

Hey Tim, They were ordered with a RZ part number... but anyway they are the same as the RS's, and most importantly they are what I claimed they are. While I noticed some of the posts giving credit to the intake and the intercooler piping and exhaust. The intake and intercooler pipes do help, but the stock down pipe is smaller than the 93's stock one by about 1cm. This is to prevent the car from breaching the govenments 280hp limit on production cars over here in Japan. There are several cars over here that are pushing over 380rwhp over here with the 280hp spec turbines.;)

Tim let me know how those 99's work once you have them hooked up. Jesse the 98's are working great good boost and no leaks - Thanks again :) I need new brake rotors can someone please hook me up. Tim pm me your email address I want to send you some pics of my FIKSE's.

Once I got the turbos from Jesse, man you can tell a difference in tolerances looking at the housings. Wow, blades are touching the abradeable seal, just waiting to make boost on my car:) Thanks again Jesse for the hook up and if anyone needs a set, I'd check with Jesse first, price is better than Mazdacomp and you don't have to wait months for them to come in.
Fritz, I'll PM you tonight...how did the car run at MADS?
Tim Benton

Tim, Rich at High Tech worked til 4am trying to get my turbo's he was busy breaking bolts all four to be exact needless to say he couldn't put it together in time but he does have heart for trying man thats a dedicated shop freakin 4am and to top that of the poor guy got sick over the weekend.

So I took my 93 to MADS which is running really well and had a complete blast. VIR is a fantastic track and very safe you should try really hard to make it in the fall. Man I just missed getting those 99's you lucky focker :)