What are the traits of a good road racing set up and which turbos have them? Just Curious!

you need response over ultimate hp. you need the throttle to balance the car in the corners



mike

Oh, so what turbos are good for this? I asked the same thing on the "other forum" and they recommended the RX6 and GT35/40. What about the T78/T66?

T78 and T-66 would be too big. They lack the response the rx6 and gt35/40 have. If you went custum something like a 60-1 or 62-1 with a .7 compressor and .84 exhaust would give you a quick spooling turbo with decent top end.

A lot of guys use the rx6, and 60-1 for road race.

a T04E would be better for road race........

I agree. T-04S with a small exhaust housing(.84~) would net you plenty of spool up and horsepower for a road race.

What about a BB Turbonetics T3/T4? Who makes the 60-1, anyways? Thanks!

A t3 is too small, go with a t4 based turbo. Garret makes 60-1.

if a t3 is too small exprane prease the gt3540?



mike

i think he meant a t3 by itself is too small



kevin

Rotaries produce too much exhaust energy for t3's. T3's work well on boingers. The "35" on the gt35/40 is the turbine side and has a t3 style flange. It is not a plain T3 style turbo though.

60-1 is made by turbonetics. Same guys who make the T-66

Ok, Thanks! I thought T66 and 60-x series turbos were Garrett only

I think lag and boost response are being confused here. If you're looking for a ROAD RACE setup, and not an AUTOCROSS setup, then you only really need a turbo with good boost response. (i.e. in the upper rev ranges, the car builds boost quickly). For an autocross setup, you'll be letting the revs drop a lot lower through the corners, so you'll want a turbo with minimum lag, that builds boost quickly from very slow speeds.



That said, for autocross, I think the RX-6 would be a great turbo. Though it lacks the top end of some of the others, from what I've heard, it builds boost incredibly quickly.



For a road race setup, just keep the compressor sized so it stays in its higher efficiency ranges, and the hot side A/R within reason. BB turbos always help in response, just make sure you get a good one. I've heard that turbonetics' single ball bearing center section turbos tend to fail, but the dual BB ones are more reliable...



good luck!

kyle

the rx6 is ball bearing if you were wondering. mine has good power down low and pretty nice pickup in the higher rpms as well. i make full boost "13psi" at about 3000rpms. by no means is it a drag turbo. but it is alot better then the twins.

Boost Response determines the speed from where to where? (rpm range/turbo speed range/boost level)

Thanks! Does HKS, etc make their own turbos or do they buy from manufacturers?

HKS turbo's are basically turbonetics turbo's with a convex bottom on the compressor wheel and a concave back plate(or it may be the other way around). They are identical in every way except for that. Basically, if you **** up an HKS turbo(compressor side), you'll have to replace it with HKS parts....which tend to be more expensive than turbonetics parts.

hks = garret

greddy = mitsubishi

apexi = ihi

turbonetics= turbonetics



mike

Ive heard of a Apexi RX6b what is that?

RX6B- IHI ball bearing turbo

It's pretty small compared to the others

actually the rx6b is good for 550 hp. the normal rx6 is good for 400rwhp.

also the normal rx6 is larger than a normal t04e, but smaller than a t04s. the rx6 is ballbearing which gives it better spool than most turbos.

I'd go with the to4s or 60-1 a/r 70 compressor, a/r .84 exaust.. quick spool up, great response, easy to overhaul, 400 hp and they are very common so cheap to buy... If you look around you'll see that is what most of the circuit racers here in Japan run as well...

What about the to4R turbo? Or is the spool up not as quick? I know this is the single turbo threads, but wouldn't an upgraded twin turbo: like BNR, M2, or '99 spec turbo's be better? I mean if they can get 400hp.. you know the spool up rate should be much quicker than any single turbo.. https://www.nopistons.com/forums/pub...1047683561.gif for a road race set-up.. just a thought.

While twin turbos like bnr,m2, or 99 will spool up quickly, they still will struggle for 400hp. Plus they need to be setup non-seq, no one likes to have turbo's kicking on and off to throw the rear end around. Add heat and complexity to the twins and its just as easy to go with a smaller sized single turbo.

Yea, well that's true.. and I guess it might be better in sacrificing the twins (with the quicker spool-up rate) if you're then going to recieve less problems, with more power.. But just wondering, when it comes to spool up.. what single turbo is the closest comparison to the twins?

RX6 most likely, followed by the BB GT35/40

Oh ok. cool

The GT35/40 is offered with a .86 A/R and 1.06 A/R. Most people have the larger A/R, but if I was picking a turbo for a roadrace car, I would probably go GT35/40 w/the .86 A/R. Very quick spool, plenty of top end (over 400rwhp), and runs sooo much cooler than any twin setup could ... also cooler than some of the other non-water cooled single turbo's.



I wouldn't go with a port quite as large as my nocab-pineapple port, probably something along the lines of a medium street port.



K