Interesting point. People talk about making full boost at whatever rpm but I think it's more important to see how much power at what rpm you are making (also how it comes on obviously). A single turbo car may not make the same boost as the twins would at a certain rpm but it may make the same power.

This.

Going single will simplify the super complicated crowded (relatively speaking) engine bay.

If and when my engine goes a street ported engine with a gt35r is going in. OR an LS ;). Depending on whether I decide to tackle the swap myself. Because if I go ls I'm doing it myself. If I decide to stay rotary, I'm going to a shop to have it done.

Yeah, its all about the setup not all singles are laggy. I see 5psi by 2500 and 10psi at 2800, never paid attention to when i get to full boost of 16-17psi but its not much past 3200-3400 I would guess. I don't have tire spinning low end torque but if i want to make it thru a yellow light or pass someone I don't feel like i HAVE to down shift and on canyons im never chasing a super narrow powerband just to enjoy the car.

http://i2.photobucket.com/albums/y17...S/3deff328.jpg

I had my response all typed out and when I hit send on my phone it crashed.... boo....

Im not ignoring you I'll come back and respond. :)

Damn full boost by 3500? Thats great.

While I have the stock twins, it's non seq. Its LAGGY. I know its mainly because I have the stock cat but reason why I never converted back to seq because I don't want those problems.

I have NEVER had a turbo/boost issue except the time a hose was knocked off my wastegate which was user error causing me to get boost spikes like crazy.

I suppose a hf cat will lessen the lagginess and maybe I'll reach full boost by 4k instead of 4500, is it really worth it?

I've had stock twins, bnr twins, gt35r, and now an aspec 500r. I liked the bnr, and the 500r setups. BNR was tuned to 16-17 and they came on lightning fast. Power was instant, and predictable, but I got bored and wanted more oomph in the top end. By third gear it didn't have enough for me.

The single turbos are tuned to the same boost, and power is less linear compared to the twins, and with less response. If you down shift then that certainly makes a huge difference, and is likely what anyone would do. With the bnr I didn't need to. The 500r has enough power to keep me focused on the road, where with the twins I wasn't thrilled. The 500r obviously moves much more air than the twins could but I can't help wonder what more power would be like.....

Summary
Twins are ok, BNR with higher boost is good but a single makes up for the response difference with more top end smiles.

I love my sequential twins! Over 400 HP, smooth transition, quick spool, and great low end power(Thanks to Banzai racing). For my kind of driving, weekend touring and track days sequential is the way to go. I think single is more for straight line drag racing, extreme high power and for shops that don't know how to get twins to work properly. I've driven single turbo FD and FC with more power and less power than my car. I'm very happy with my set up.
The main thing is to decide how you plan on using your car, driver, weekend touring, weekend street racer, drag strip, road course, autocross. One set up will not do them all.
Just my two cents,
Joe

You have any dyno sheets where they started plotting the pull sooner? That dyno sheet does not do much justice for the sequential argument as they started the pull too high in the rpm band. Would love to see your power/tq around 2500rpms+. Great final number on sequential though. :icon_tup::nod:

I won't lie, I don't regret going single but some days I do miss my twins.

Here is Joe's previous dyno sheet from 3/10 402whp/341tq, this is before we ditched the AEM tru-boost and installed a Greddy Profec. Once I was able to keep the boost from dropping off and do a few mods so that there would not be a huge dip at transition we achieved the above posted power. The initial goal was to get the car over 400whp with 99 twins, then the next goal was to make the boost consistent to extend the torque curve and make transition less of a power/torque drop. I am sure he has other charts from the 4/11 tuning session which show even higher low rpm hp/tq since we managed to get the primary boost more consistent as well.

http://www.banzai-racing.com/dyno_ch...t_03-26-10.jpg

What gear and situation was this pic taken in? I can make factory non-seq twins hit 10psi by 3000rpms if Im in 5th gear going up a hill.:lol: Always kills me when people talk about turbo response but we never know all the details. Of course single turbo guys want to justify their decision so some guys want to make response look better than it really is.

What turbo are you running, and on a typical 3rd gear pull when is 10psi or 16-17psi reached?

Even more impressive on 99 twins, I assumed it was on BNRs. Like to hear how the NA 20B guys would argue against that dyno sheet.:scratch:

This thread is making it hard for me to pick between twins and single :lol:

Single. Dont regret it one single bit, i actually keep smiling at the top end of 3rd gear...

Impressive for '99 twins. I also assumed BNRs.

However, what boost are they running at?

The sheet I posted shows boost, it is 17.0 psi

The most recent sheet that Joe posed also shows boost it is 17.7 psi, it does have water/meth

Here is a larger version of that sheet.

http://www.banzai-racing.com/dyno_ch...o_04-11-12.JPG

Thanks Chris for answering everyones questions, I'm at work and can get online much.
I would like to add, I can run my car with boost controller "off" giving my car low 300HP or on "low" giving mid 300HP or on "high" giving my car over 400HP. It's like having three cars in one. Touring, track and strip. FD, the greats car ever! :lol:

I believe that pic was in 3rd gear after stabbing the throttle from low rpm on a level road. Turbo is a 35r w/ 1.06 turbine housing. On a typical 3rd gear pull 10psi is achieved a bit before 3k and 16-17psi comes on around 3500ish. As far as talking about response without details you should check out this thread with plenty of data and details in the single section: https://www.rx7club.com/single-turbo...urbos-1007020/

I plan to do some logging to contribute to the thread when I make it back home.

I'm looking at the single setup too but lot of research to do

I'm glad that I have a tuned twin setup. The sequential boost kick is more fun when you drop the hammer.

What kind of IAT's do the twins show with a good SMIC? I'm going single in an attempt to control my temps on track. Will the twins keep their cool like a single for 25 mins under full boost?

I don't think going single is going to lower your temps, you be better off with a FMIC. I also had high IAT at the track but didn't want to change the look of my engine bay. Chris from Banzai recommended water/meth injection and its one of the best things I've done to my car. IAT in check always even on the hottest days.

The previous owner of my car won road races in SCCA Solo (CASC) with a sequential setup on a modified base model. My car has a Pettit Racing intercooler and a Mazdaspeed radiator, but I think it is missing the R1's oil coolers. Otherwise, the car ran on Mobil 1 5W30 and it didn't seem to develop any overheating problems.