speeddemon7

I looked around but havent seen any figures as far as when you hit full boost and at whats rpms.
I see that the gt 35/40 is popular and so is the rx6 setup.
Would the stock fuel system be enough to run say 15 psi? with a single turbo?
I know you have to upgrade the intercooler as well.
Can you run a single turbo at stock boost levels and be alright as far as air fuel ratios go? untill you can upgrade other components?
Things get costly when you figure in an upgraded ecu,intercooler,possibly bigger injectors.
Im just getting sick of always having sequential problems.I think ive had the car work correctly for about 2 days.The boost was almost instantaneous.It started to buil up at about 1200 rpms and by 3000 it pulled very well.Nedless to say i have the car taken apart again trying to figure out why in the hell its back to being laggy as all hell.I dont hit full boost until almost at transition.I havent found any popped off vacuum lines or anything yet.I hate to give up on such a fast spooling setup.Especially since its an auto fd.But I just dont feel like taking everything apart every damn weekend.

Trexthe3rd

The RX6 BB is about the fastest spooling single out there for the FD. Boost should come on around 3500 rpm. And hell no the stock fuel system and ecu will NOT handle 15 psi, it will not handle 10 psi either.

To do the single turbo upgrade correctly means you'll need the following:
The turbo itself
Exhaust manifold
Better intercooler and piping
Larger fuel injectors
Matching fuel rail
Fuel pressure regulator
Fuel pump
Programmable ECU
Tuning session

Typical cost ~ 4,000.00 if you do all the work.

Or you can just slap on a turbo and pay for an engine rebuild every 500 miles.

1bad7

id have to write a whole book to give you the proper information your looking for. my main advice is spend a couple days just searching and reading this forum... ive been around for awhile and i know these questions have been discussed in detail many times, my main advice is if you dont have alot of spare cash just sell the rx7 and get something else, this is not a cheap car to own let alone mod.

PS: 15lbs isnt even safe with the stock twins on a stock fuel system... and single without the proper mods (intake, full exhaust, IC, fuel, pump, and standalone) is suicide. good luck

rotoboy661

to4s

bond007

I think your post answers your own question. You are concerned about cost of doing it right. If that is the case (doing it right is the most important thing) and you don't want to spend the money or time, then you are probably better off paying someone knowledgeable to fix your sequential turbos. The stock sequential system is not that complicated, however, having an automatic throws some interesting issues into the equation.

You could run a small single (think turbo-II sized, HT-18, one of which is bigger than one of the stock turbos) on the stock fuel setup, it has been done before, but you have to keep it at 10psi and it's a fairly expensive proposition to put a single turbo in a car and not get any increased power out of it by upgrading the other pieces. You will have less charge air heat, so the fuel would need to be trimmed a little for the cooler intake charge and different boost curve, so a Power FC would be the best solution, but you have an automatic, and IIRC, the PFC and automatic don't work well together. There are "hacks" that one could do to put a single on a stockish car, however, it is not recommended for the average owner who is asking if those hacks can be done in the first place...

In any case, on any modded car, it is a good idea and cheap insurance to run a wideband O2 so you know exactly what's going on.

Last, no change is without compromise, be it performance, reliability, or the dent it puts in your pocket. Do thorough research and quantify all of those issue and you'll come up with the best decision for your situation. If money is your main concern, find someone good with the stock sequential system and pay them to fix your car instead of banging your head against a problem that you can't solve by yourself (or find someone local to check over your work, a 2nd pair of eyes, maybe not even very knowledgeable may ask the right question to lead you to a solution).

Regards,
--Ashraf (became a stock sequential guru by necessity several years ago)

twokrx7

iTrader: (1)

https://www.rx7club.com/single-turbo-rx-7s-23/whats-your-spool-time-342203/


Many threads out there where folks discuss their spool rpms.

Consider looking at dynos with similar motor porting ... you may want to look at the rpm window where torque is made. My T66 made 300ft-lbs at 4000 rpm and kept it above 300ft-lbs thru 7500 rpm, I'm sure my street ported motor helped on the top end.

riceman1998

iTrader: (1)

Isn't Apexi RX6 turbo discontinued production a while back now? Can anyone buy this kit anymore? If so where?

1bad7

rx7.com has 2 kits left... i bought the third one

talk to rocky and tell him jack from canada sent ya... he'll hook you up for under $4K

Black97VR4

RX6 is alright but keep in mind, if something happens to it, you can't rebuild it.

Another option is the T04E which spools pretty fast.

With small singles, they taper off on topend.

I would suggest a search, people have tried just about everything.

You're probably going want to do a auto to manual swap as well since the stock auto can only hold about 300rwhp before giving out.

speeddemon7

an auto to manuall swap is in the near future.
I just want to get these turbo issues fixed.whether a single is the answer or maybe some upgraded twins im not sure.
what about the m2 twins? are they sequential or non sequential turbos?

Black97VR4

I think non seq. but I'm not sure. BNR makes some good upgraded twins. Honestly, if you have the money to do it, going single is just some much nicer with so fewer problems in the end. It just costs money to do.

speeddemon7

how are the new bnr's? i know my primary is probably shot.shaft play and also oil in the intercooler pipes.who really knows for sure?its such a huge pain in the ***

Black97VR4

I heard they're pretty nice. Definitely an upgrade over the old design.

Black97VR4

*Edit* Double post.