Has anyone ever upgraded to the 1999 Efini Sequentail Twin Turbos? I hear they have been improved to lessen the amount of turbo lag.

http://www.shaneracing.com/sr93trbo.html

Just scroll down untill you see " New Turbos High Performance 99' Efini RX-7."

Are they worth upgrading to?

 

Thats an awfully large price tag, considering the t-78 kit was the same price (before the TTs went on sale) and there are other massive single turbos for much much less.... I could see it being a good upgrade....but at that price I dunno seems a bit high.

 

definately, for that price you can make a much better setup

 

"Make a better setup." What do you mean? How much of an improvement over the 93-95's are these 99's? What kind of setup can one do with these new and improved turbos?

 

They are cheaper at other places:
http://www.rx7.com/store/rx7/fdturbo.html

They aren't that much of an upgrade from the stock 93-95 turbos. However, if you have the stock ECU (or any non-programmable ECU), it will be cheaper to go with one of these than a single setup as you'll HAVE to replace the ECU (most likely with a few other things) with a single upgrade.

 

http://www.pettitracing.com/rx7/turbo_intercooler.htm

 

by that i mean get a different turbo setup, because when its not their "special untill friday" or whatever it is very expensive for only a small upgrade. these turbos are only a bit better, around 30hp more than the series 6 rx-7 turbos, series 7 turbos are more reliable though. for example this is an example of a turbo kit that costs less and is much better, these are gt28r ball bearing turbos that spool fast as hell compared to one big turbo and can make up to 400 wheel.

hope it helps,
StealthFox

 

NOT.

Those twin GT28Rs are $1000 more than the 99-specs from rx7.com or other places, will require a standalone ecu, and custom intercooler piping. They also run in parallel, meaning that they will spool over 1000 rpm later than the 99-specs running sequentially.....1500 rpm later if you aren't running a midpipe.

Yeah, they're just "better"...

 

im haveing 99's instaled as we speak over at rotary extreme (thanx chuck) i got them for realiability reasons and they can make decent power. ill let u know how they turn out once i get my car back.

 

I have them on my car and i like them. I like them because they are pretty much still new, they spool up faster and because i did not have to pay for it. It came with the car. Does anyone know how to distiguish the earlier turbos to the 99 spec ones?

 

im not exactly sure how to distinguish them but here is a p of my 99's <IMG SRC="/ym/us/ShowLetter?box=Inbox&MsgId=179_1950187_176_1320_61 5096_0_29936_802512_183476892&bodyPart=1.4&YY=2532 1&order=down&sort=date&pos=0&view=a&head=b&Idx=2 " style="WIDTH: 480px; HEIGHT: 360px" height=360 width=480 vspace=5 comp_state="speed" DATASIZE="37146" ID="MA3.1120787786" ></DIV>
<DIV><IMG SRC="/ym/us/ShowLetter?box=Inbox&MsgId=179_1950187_176_1320_61 5096_0_29936_802512_183476892&bodyPart=1.5&YY=2532 1&order=down&sort=date&pos=0&view=a&head=b&Idx=2 " style="WIDTH: 480px; HEIGHT: 360px" height=360 width=480 vspace=5 comp_state="speed" DATASIZE="29575" ID="MA4.1120787786" ></DIV>
<DIV><IMG SRC="/ym/us/ShowLetter?box=Inbox&MsgId=179_1950187_176_1320_61 5096_0_29936_802512_183476892&bodyPart=1.6&YY=2532 1&order=down&sort=date&pos=0&view=a&head=b&Idx=2 " style="WIDTH: 480px; HEIGHT: 360px" height=360 width=480 vspace=5 comp_state="speed" DATASIZE="29007" ID="MA5.1120787786" ></DIV>
<DIV>

 

I have not ever seen any evidence that the 99+ turbos are much better than the stock turbos. The HP boost in the 99+ cars comes from increased boost and a slightly different charge path in addition to whatever gains may be from the turbo re-design. I have yet to see a dyno chart comparing stock vs. 99+ with all other things being equal.

Personally, if your stock turbos were in good shape I wouldnt spend the $ on a set of 99+.

 

the wheel of the 99 spec turbine is a tighter fit to a housing, i forget the term for this. i dont know how noticeble the diffrence would be, but i am sure there is some. upgrading just the twins is not the only part of having a reliable car, there are a million solenoids and other things like actuators that deteriorate and dont work the same as when teh car was new. dont get a set of new twins for 3k thinking you now have a new car.

 

Of course not. They are a good option for someone to replace their stock twins if they are not caught up in the car *****-size wars and trying to hit over 400 rwhp.

I doubt they make more power but they do spool faster. My mechanic gets boost response by 2200 rpm on his car with them.....

 

the only reason im getting mine is cause my stockers had 100,000 mi on them and they had a crack on the secondary turbo and were leaking alot of oil. and the 99's are cheaper to buy new compared to the us-spec.

 

Yeah, on my car, I hit 13 psi roughly 200 rpms quicker with the 99's over my stocker that were in fine shape when I took them off.

Tim

 

i just got my car back today w/ the 99' turbos and i love them. they spool up quick and perform great... so far. i also got y pipe, dp, 9.5 lb. flywheel. they all work great and had them instaled over at rotary extreme and they did a great job. thanx chuck

 

my turbos are blown and leakin a lot of oil. i know where i can get a set of used 99 spec turbos for $300-$600 shipped. my horsepower goals are very modest, only 320-350 for now. if i go single turbo, a tial wastegate almost cost that much. one concern i have for these turbos is boost control since they are internally wastegated. i'm affraid boost creep could be a problem. what do we think of this? oh, and i would run them non-sequential.
supporting mods include:
apexi intakes
m2 large smic
greddy type s bov
cheap *** boost controller
greddy pulleys
apexi power fc
3" exhaust ( downpipe, midpipe and catback)

 

The 99 turbos are very similar to our oem turbos. If you arent having boost creep with your current turbos, you shouldnt experience any problems with the 99s.