Which setup is more efficient in general for a daily driven fd, twin turbo or big single turbo? Im talkin the most bang for the buck, I'm not planning on trackin it or anything like that, so im not talkin drag hp numbers. Also TT FDs come with a sequential setup am I correct?

 

twin and yes, a sequential setup

 

A smaller single doesn't add any more " lag" than the stock twins, and gets rid of a lot of complexity and heat.

 

well one reason I ask is because I may be getting a rebuilt 13b from rr&r or purchasing a fd with a motor either way I would want to upgrade the stock turbo system, or convert it, just not sure which I should go for

 

If all you're looking for is a DD in mid/low power levels (300-400whp) than just stick with the stock twins at 13psi.

Anything more and you're looking at spending lots of money to make reliable power, and once you increase the power you'll be increasing the likelyhood of something (expensive) breaking unless you go ALL OUT and put a large amount of money down from the get go.


Long story short, if you don't know what you want then just keep it simple. Once you know what it is, exactly, that you're after then you won't need to ask people on here to tell you what it is, you'll simply look for confirmation of facts you're already aware of.

 

Valid Point. Im think ive noticed on forum posts that TT is more fuel efficient and causes less problems than a single, would that be a correct statement?

 

It really all depends on what you do with them. If you keep the car at stock power levels and only upgrade the ECU, Downpipe, Radiator, AST, etc., and tune for reliability and fuel consumption then sure.

On the other side of the fence, if you push everything for power then your fueling is going to suffer (regardless of turbos, I'm running sequential twins with 400rwhp and I see 11-13mpg on average. I think I've gotten 17mpg once this year, it was on a long highway drive and I had the cruise control set to 65-70 the entire time). When it comes to pushing power at, or above, 400whp then a single will DEF be more efficient and less likely to fail.

 

keep the twins and run 15psi.

 

Single and twins create their own unique set of problems.

Twins run hot and require a group of solenoids and vacuum hoses to run them in sequential mode. This compromises reliability. On a budget, this is the best way to go. If the system misbehaves or you dislike the complexity you can convert to nonsequential operation.

Single turbo setups are built from all aftermarket parts with aftermarket ECU tuning. While a well-tuned setup can be more fuel efficient in daily/highway driving because of better tuning, the additional cost will never be recovered in fuel savings. And when you do put your foot down, more power means more fuel and lower fuel economy. In daily use it all cancels out. Also keep in mind most owners of single turbo conversions are looking for power, and they push the stress levels of the car in general to obtain that power. So while the single might make for a cooler and simpler engine bay, you may find yourself replacing transmissions, tires, diffs, and axles more often. Plus a single turbo doesn't have the broad torque range of the stock sequential turbos - most non-enthusiast drivers enjoy the sequentials much more than a big single.

If money is not an object there are also the options of going with a smaller single turbo that isn't tuned for very high boost. Or you could go with upgraded twins and retain the sequential boost design.

Dave

 

I'm curious to know how in the hell you can get 400whp on stock twins at 13psi?

 

Check his sig... Im sure hes running BNR's and they are not at 13lbs of boost

Chris

 

you can't

 

You really don't want a big single for a daily driven FD, a medium ball bearing single would be much better. The most bang for the buck I'd say BNR's (upgraded twins) as they can push above 400+RWHP.

 

there is a Greddy TD06 kit for sale in the classifieds right now. I highly reccomend that setup for a street/daily driven/odd track day car.

I'm building mine up right now and it should have around 360-380 whp with very quick spool.

 

medium single kit, much easier to work with and spools just as fast as twins and can make more power.

 

Oh, you won't, lol. Not at 13psi anyway. I just said 3-400 as the general range of low/mid power figures after modification.

I'm getting 400 on BNRs at 1.2 bar (340whp on a Dyno Dynamics, or "heartbreak", Dyno. Add 15-18% to compare with Dynojet/Dynopack = 400)

 

what would be the best upgrade for twin turbo's??? and can someone explain to me what psi means? sorry im kinda new to all of this stuff.

 

The best upgrade for sequential twins is more boost on the sequential twins. Perhaps sequential BNR turbos. PSI means pounds per square inch. It's an indication of how much boost you're pushing in to the engine, but is somewhat inaccurate since it doesn't have much bearing on the actual volume. IE- 15psi on the stock twins isn't the same as 15psi on a big single.

If what you just read raised more questions than answers then you should start here and here.

 

Trewtch,

I almost want to believe that you are messing with us. But in any case you are not read up on the FAQ's

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/

Don't even think about upgrading you car until you have a good grasp of how this stuff works.

 

If you stay twin turbo, its best to go sequential.

NON seq is like the lag of a single turbo, without the single turbo power IMO lol.

Besides the absense of turbo diagnosing problems with non seq, its better to just ditch it completely and go with a relatively mid sized single or master the seq of the twin turbo and keep that.

If i ever decide to go single turbo, i would only opt for a GT35R. Good size, fast spooling, good overall RWHP on pump.

I dont need a HP queen. If i did, i would have gotten a supra

 

I agree, but non. seq is a lot less confussing if something goes wrong. ie: vaccume line pops off. Where the seq. system has many, non seq. has very few. Spool up time does suffer, but not that bad. Power is the same either way, just all depends on what you want and where you live. Some states require emissions test, not SC! whoo hoo! So i have ALL emissions removed and non. seq. works well for me.

As far as going single... if i ever were to i would also go with a GT35R or somthing similar with quick spool up. For now the twins are great for daily driving and make plenty of power to have fun on the street/highway.

 

I'm daily driving a T67 single turbo...doesnt spool up till 4,000 rpm. It is somewhat annoying, but when you want to use it...man will you like it

 

Anyone running a HKS T51R SPL??