GT35r ok for road race/autox or should I get something smaller?

[jamesfoster]

I currently have a GT35r that I'm planning on installing on my 90gsx, but I've recently realize that I want to focus more on road racing than straight line speed. However that leaves me with the question, should I put the 35r on or should I go with something a bit smaller?
the rest of the car is already set up except for brakes, I have a full cage welded in, 5 points, tein ss coilovers, and sadly stock brakes. Brakes are the next upgrade, but I need to figure out my turbo situation first.
-James

 

[jrohner]

I definitely wouldn't want that turbo on anything but a drag car.

It will be hard on the transmission because you're going to be doing a lot of downshifting to keep the RPMs up.

Also remember, whatever rpm it spools at in a higher gear, you will need to keep it at a higher rpm than that to not have a lot of lag. Still, you will have more lag than a smaller turbo.

How much power do you really need? I think for road racing it would be good to have quite a bit of torque, not just top end HP.

 

[360glitch]

I don't know how much autocrossing you are wanting to do or what your mods already are but remember big mods such as a turbo upgrade will likely put you in a class you do not want to be in unless you are going all out with the rest of your mods.

 

[4g63tcrazy]

I would lean more towards the 30r if anything. A 35r would be a bit too much unless you have a built 2.3 or 2.4.

 

[Dallas J]

An auto-x turbo will need to be much smaller than a RR turbo. Even with a Evo3 and a 2.0l I was stuck waiting for power much to often, but now with the 2.4l its pretty much perfect.

For roadracing you dont want a small turbo that will put out more heat, but youll be fine if you leave the boost down.

In road racing heats the enemy, but for auto-x lag is.

 

[jamesfoster]

Well I'll be doing more road racing than autox, and I DO have a built 2.3.
-James

 

[cioc]

Personally I think it's too big....even for road racing unless the track has some crazy long straights. I just took some datalogs at my last track day at Watkins Glen which is a 3.45 mile beast and I was spending most of my time around 5400 RPM. What RPM do you get full boost at with the 2.3?

 

[drivemusicnow]

I guess it depends... Is this a street car you want to occasionally take to the track? if so, do whatever cause it doesn't matter. More a personal preference than anything.

If you actually want to be competitive in a class, well, you wouldn't possibly have a chance with that turbo. I could go into all the reasons why, but that would take a while.. so just trust me.

 

[D_Eclipse9916]

I actually prefer a larger turbo. However a gt35r might be at the point of too big. You want enough lag to get rid of the torque "hit" of the 16g. I prefer the more linear powerband of my frank 4. Ive found at Summit and VIR it perfectly allows my to hit boost wherever I need it. I dont know about you, but im never below 3000rpms on the track.

A larger turbo also reduces heat. When I switched to a frank 4 instead of the 16g it brought me down in temps.

 

[Elvenhome21]

Watkins Glen Road America/Atlanta are about the only tracks where you need as much power as you can get, as far as true lag goes road racing doesnt see nearly same lag because you keep the rpms is the optimal spot or lug it when you want. These trannys will survive practically any turbo you throw at them (Road Racing) as long as your syncros are in great condition where you wont miss a shift.

With road racing lag can be your friend as long as when it does finally spool you are ready and can control it, but a awd its hard to break the tire loose any ways.

 

[prostreetdsmx1]

I was so bitter that I missed our races at the Glenn and Road Atlanta.

But to the topic at hand. You definitely don't want a 35R on a road race setup unless you have a good stroker, a great trans and one heck of a tune. I would actually really recommend something like a PTE 50trim or the likes. You'll get good spool with the ability to make 450ish which makes for a hell of a fast car.

 

[4g63tcrazy]

^^^That, or like I said the 30r. With a built 2.3 that thing will spool quick. Also if your doing more road racing than autox then I think this turbo would be absolutely perfect.

 

[BrokenTsi]

I think a 35r will work great for road racing, but not auto x.

 

[slipstream808]

I vote 30r as well! And nothing new, just the same reasons above.

 

[awdfun]

My 16g was $500 brand new. I've done three track days, six autocrosses, and lots of fun road trips on it.

And there is yet to be an event where I felt that more power would result in better lap times. Your decision though, a huge turbo or a good set of race tires...

 

[bastarddsm]

What about a holset? I belive a hx35 would be perfect for you.

 

[TSIMonsteR]

I was so bitter that I missed our races at the Glenn and Road Atlanta.

But to the topic at hand. You definitely don't want a 35R on a road race setup unless you have a good stroker, a great trans and one heck of a tune. I would actually really recommend something like a PTE 50trim or the likes. You'll get good spool with the ability to make 450ish which makes for a hell of a fast car.

Being that I know you are the BW pro, would you still recommend the PTE 50 trim over something like an S256?

Road Racing is going to be the main purpose of my car one day and I want to build it up accordingly. Once the E3 16g dies (it may never die), I was looking at 4 turbos, HX35, S256, 5031RE, 30r. All of these turbos, including the 16g will hit my 11.5 1/4 mile goal, but for Road Racing, which would you recommend? Once the 2.0 bites the dust, I'll be going with a 2.3 setup.

Also, I plan to stick with the auto and paddle shifters.

From what I have seen, the 35R on a 2.0 would definitely be to laggy for Auto-x. You MAY be able to get by with a 30r on a 2.0, but you'll still probably find yourself waiting on the turbo too often

 

[jamesfoster]

Well, considering I already own my 35r, and for the time being my car will be a street car that I occasionally take to the track, I think I'll just stick with the 35r for now.

However, down the line I would love to compete in some road racing events and I think at that time I will switch to a smaller turbo.

I'm fairly close to VIR, when is a good time to go for beginners like me? It would be great to go there sometime with some other dsmers.

-James

 

[byebyev8]

hx 35 in a bep housing, 16g quick spool+450whp capable.

 

[TSIMonsteR]

Well, considering I already own my 35r, and for the time being my car will be a street car that I occasionally take to the track, I think I'll just stick with the 35r for now.

However, down the line I would love to compete in some road racing events and I think at that time I will switch to a smaller turbo.

I'm fairly close to VIR, when is a good time to go for beginners like me? It would be great to go there sometime with some other dsmers.

-James

The guys at CaDSM go up there every once and a while. The track is only about 45-60 minutes away from me as well. As soon as I get some paddle shifters working in this beast, I'm heading up for a class or something. I'll post on CaDSM when I'm ready to go and maybe we can get a caravan going.

 

[jamesfoster]

The guys at CaDSM go up there every once and a while. The track is only about 45-60 minutes away from me as well. As soon as I get some paddle shifters working in this beast, I'm heading up for a class or something. I'll post on CaDSM when I'm ready to go and maybe we can get a caravan going.

Sweet sounds good.

 

[D_Eclipse9916]

Go with Mid-Atlantic NASA. Great group of people and I am there at every single event for NASA so ill be there working or driving so I can help you if you have any questions while your there. They do not have any more VIR sessions this year, but they always have a VIR in February. You would sign up for what is called HPDE1. There are other groups out there you can go with but ive always found NASA to have the best and nicest people which is why I love my track weekends even if im working for NASA.

 

[Ludachris]

I think a 35R would be too big for road racing if you want to be competitive, even with a 2.3L. I would suggest a 30R at most, but a BB 50trim would be ideal. A 35R is much better suited for drag racing. You'll be fighting lag coming out of the turns and it will hurt your exit speed.

I have a FP BB 50trim and feel that it's more than enough for even the bigger road courses (like Miller in Salt Lake). If I need more power I can run race gas and turn up the boost. I've been running 91 octane and have the boost somewhere around 19 lbs, and that keeps me competitive with some of the modified C6 Z06's I've seen at the track in terms of lap times.

You don't need a big turbo for road racing. You need an efficient (BB) turbo. I think my turbo is perfect for my setup. But if I was on an extreme budget, a 16G would be a good choice too.

 

[TSIMonsteR]

Go with Mid-Atlantic NASA. Great group of people and I am there at every single event for NASA so ill be there working or driving so I can help you if you have any questions while your there. They do not have any more VIR sessions this year, but they always have a VIR in February. You would sign up for what is called HPDE1. There are other groups out there you can go with but ive always found NASA to have the best and nicest people which is why I love my track weekends even if im working for NASA.

I'll register up with NASA (Mid-Atlantic) soon then. Thanks for the advice.

With the right setup on a 50trim or even 16G, you can get into the high 10s, low 11s, and still be competitive on the Road Course or Auto-X.

My question still exists though, of these 4 turbos, HX35, S256, 5031RE, 30r, which would be the best decision for an all-purpose 2.0 (or 2.3) car? (new thread maybe?)


On topic: I'd say the majority vote is no on a 35R for Road Racing. However, you already have the turbo so there is no since in loosing money on the investment. I am sure you can make it work, it just won't be the ideal setup.

 

[gixrman]

My question still exists though, of these 4 turbos, HX35, S256, 5031RE, 30r, which would be the best decision for an all-purpose 2.0 (or 2.3) car? (new thread maybe?).

This all depends on what mods have been done to the car, intake, CR, cams, exhuast, FMIC, gas used, even boost controler can change spoolup on any turbo. In the end you want fast CONTROLABLE spool without over heating the air charge.