I will be doing a single project soon on a custom built ported motor.I am deciding on a TO4R or GT 3540 with either Power FC or Microtech. However a friend of mine told me that low end torque (1K-3K) will be unbearable,up to a point of possibly stalling a few times with the AC on. It will be a pain for stop and go driving. It idles like **** etc.The tuner in Australia however said that it will only be slightly worse than the stock, but still ok for street use. I need advice from single owners, as I have never sat on a Single FD before. Which of the following is true. Very confused here. Please help.

 

I don't have a single but I can tell you that you will lose a TON of low end torque. My only mods are a downpipe and cat-back at stock boost and I make more torque (and consequently, horsepower) until 4000 rpm than a T-78 running 15 psi. In fact, I make 50 ft-lbs more at 3000 rpm.

I doubt you will have problems with stalling with the A/C on, that sounds like a completely different issue to me. However, I agree that a larger single would be a complete pain in the *** in normal driving.

However, smaller turbos like the RX-6 and T04S spool earlier. I think they are at full boost before 3500 rpm. I imagine they're quite a bit more drivable.

 

Thank's Ryan, maybe you are right.

 

I don't think you'll have an issue. Our FDs make no power below 3 grand as it is. I've found 3000 rpms to be a happy cruising rpm; I'm never below 3k for very long. My lightweight flywheel helps to get me going in first gear, which further shortens the time window that I'm below 3k from a stop. Keep in mind that I'm on the stock twins....my bud Ihor (silver93t) has a GT3540 and loves it. I'll see if I can get him to post here.

Btw, in the interest of upgrading my turbo setup but still getting boost and power around 3k, I'm looking at running the BNR Stage 2 upgraded twins. Supposedly good for over 400 to the ground at 15-17 psi.

 

I've got a Pineapple large street port and GT35/40.

Around town drive ability is not really effected, just don't try to race anyone from 2500rpm.

IMO, You really only need about 75rwhp & 75rwtq to pull away from a stop light like any normal driver would ... Have you ever driven a cavalier or a honda?
If you need some power, wind out first a little bit and you'll break the tires loose...

I have NEVER had a problem with stalling the car, even with a 9.5lb flywheel and ACT S/S clutch (Soon to be 6puck).

K

 

If you want torque... you need to look at a domestic V-8 (or more).

Japanese turbo cars don't do it down low... but crank the boost and get the revs up and you'll spank some ***!

 

Howdy Jim,

I find your signature amusing. What do you say to people when they tell you that your Supra is a bloated pig with a spoiler best suited to hang clothes out to dry on ?

Btw, I think your car looks very nice. Just bustin' some *****, my boinger brother .

 

I tell them to bring lots of laundry and they can dry theirs on the pigs back too!

Thanks... and I know you're just giving me ****... I certainly deserve some back considering how much I give!

 

You do lose some low end power, but you also get rid of the 4500 RPM transition, so the net effect in driving around town is that it doesn't matter that much. You will hate it if you get in a race starting at 2500 RPM, but generally you can just keep it in each gear a little longer and it doesn't end up being that much of a problem. You don't see a lot of single turbo people complaining about lag, quite the contrary -- most people want a bigger single after they make the switch. I have the RX6 and one of my first impressions was something like "this isn't bad at all, I could stand having more lag than this".

Idle and stalling down low is not related to switching to a single. You don't need boost to idle or power the AC, so that is just horsepuckey. Porting will make the idle somewhat worse, but I haven't noticed much change on my streetport except for less vacuum. It still idles and runs fine.

-Max

 

Thank's guys. You're right, never seen anyone complain about lag even with big *** singles

 

I had issues with lag before I put my T78 in. You pretty much have to adjust your driving style(Staying in higher RPMS) After I figured that out it's a blast to drive. Drop like two gears while on the highway and hold on.