Is my turbo and engine setup too big for road racing?

[ceedawg]

Is my turbo and engine setup too big for road racing!

In my sig but I'll post anyway.

1g stock intake manifold.
2.0L ffwd built 9.0:1 Ross pistons Crower rods
264/272 hks cams
3" exhaust




Turbo Borg Warner 300sx 88-75 TS T4 .91a/r TS housing
ETS TS T4 exh mani 1.5" runners
Twin tial 38mm wastegates

ETS 4" ultra short route race intercooler


Im feeling more like roadracing these days more so than drag racing, Safer and more fun than messing around in the streets or breaking drivline parts in the 1/4 mile.

 

[turboglenn]

The engine and cams are fine, although i'm not familiar with that turbo and it's spool times.. what does it spool like?

 

[asap1320]

you definately dont need a t4 anything for road racing. bolt on or t3 tops

 

[UofACATS]

Depends on the track and intended use. Whether we like to admit it or not, horsepower is a major factor in laptimes. On a fast track, the extra lag in the corners is nothing compared to the speed on the straights.

Heat is obviously an issue, so if this is a time-attack-type car, you might get by running big WHP numbers, but if you're out there for 20 minutes it's going to be very hard to keep everything from melting. When I ran my 3065 on track I had a very modestly prepped car (basic ducting, aluminum radiator, 90% water, water wetter) and I paid for it big time.. My laps times were pretty bad sitting off the track trying to cool off my overheated car. And for a taste of what it was like, I had the NA miatas all over me in the corners, but would destroy on the straights at 24psi. I felt like I was cheating because they had race prepped cars, with real suspension, etc. but guess who had faster laptimes?

The old saying: The instructor schools in a rental neon. Because everything is secondary to seat time, the setup is of little consequence. Just get out there. A year from now you'll KNOW what you need, and you can address it accordingly.

 

[dirtysouthpinoy]

I think an evo3 16g is perfect for track use.

 

[D's GS-T]

Might be a little big. usually want to run as little boost as possible to get the power you need, and I'd imagine a T4 at lower boost would suck. Good horsepower is key, but without an awsome suspension set-up, tires, brakes, and most of all reliability mods you'll be screwed.

 

[ceedawg]

The engine and cams are fine, although i'm not familiar with that turbo and it's spool times.. what does it spool like?

Im Not sure yet because I have not finished building the motor. Still need clutch,wastegates and injectors.

Depends on the track and intended use. Whether we like to admit it or not, horsepower is a major factor in laptimes. On a fast track, the extra lag in the corners is nothing compared to the speed on the straights.

Heat is obviously an issue, so if this is a time-attack-type car, you might get by running big WHP numbers, but if you're out there for 20 minutes it's going to be very hard to keep everything from melting. When I ran my 3065 on track I had a very modestly prepped car (basic ducting, aluminum radiator, 90% water, water wetter) and I paid for it big time.. My laps times were pretty bad sitting off the track trying to cool off my overheated car. And for a taste of what it was like, I had the NA miatas all over me in the corners, but would destroy on the straights at 24psi. I felt like I was cheating because they had race prepped cars, with real suspension, etc. but guess who had faster laptimes?

The old saying: The instructor schools in a rental neon. Because everything is secondary to seat time, the setup is of little consequence. Just get out there. A year from now you'll KNOW what you need, and you can address it accordingly.

Excellent points,plan on running at Pocono which is a huge track or Lime Rock. Wow Arizona is pretty hot is'nt it.? However I will take your advice.

Another thing is that I do have a .70 T4 TS A/R housing as a spare in case the spoolup is lousy in the turns on the .91 housing. But yes another concern of mine is whether overheating would be an issue even though it is nice and cool in Pennsylvania.

I will have to look into buying a vented fiberglass hood,still have to put on my Evo9 brakes,gonna use the suspension that I have on now and stock tranny.


Other than everything else I was just worrying that the turbo might be too big.

 

[bryzenga]

Turbo will be a little big. Expect it to be a little slow on the spool, but will deffinitely pack a punch.

 

[ceedawg]

Turbo will be a little big. Expect it to be a little slow on the spool, but will deffinitely pack a punch.

Yes I kinda figured as much. This is also why I decided to keep the hks cams,stock mani,and the spare .70ar housing. Next mission would be keeping the car cool.

 

[DSMReviver]

if i am not mistaken s300sx is a giant turbo. as large as TSGT40R and GT37R equivalent. Lag is gonna be massive in this turbo. it will be too big for road racing. this turbo flow 80lb a min and it will take awhile to spool in road course situations. your best bet for road racing if i have to choose is s256 or s258 or equivalent to gt35r turbos.

I wouldn't even put 35r or just as big without supporting mods.

 

[fatt6903]

Put some Wiseco 10.5:1cr pistons or higher. High Cr will mean it will spool faster and will be more efficent at lower boost levels. My turbo builder can take your comperssor wheel and lighten it so it will spool about 600rpm sooner and doesnt effect overall power.

 

[FearlessNick]

Yes, specially down south Arizona. I like in Casa Grande witch is about three or four hours from the Mexico boreder. And this summer we got up to around 116 degrees.

 

[ceedawg]

Put some Wiseco 10.5:1cr pistons or higher. High Cr will mean it will spool faster and will be more efficent at lower boost levels. My turbo builder can take your comperssor wheel and lighten it so it will spool about 600rpm sooner and doesnt effect overall power.

Spent money on this motor already,was built for drag racing originally. Turbo is also under warranty. The high compression pistons would have been nice though. Worse comes to worse I'll put on the smaller turbine housing.

 

[dsmdeliveryboy]

My 60-1 is almost too big for road-racing IMO, so your turbo is MUCH too big. I would switch out the exhaust housings, I don't know much about your turbo but I'm in the process of researching it.

 

[Ludachris]

Depends on the track and intended use. Whether we like to admit it or not, horsepower is a major factor in laptimes. On a fast track, the extra lag in the corners is nothing compared to the speed on the straights.

Heat is obviously an issue, so if this is a time-attack-type car, you might get by running big WHP numbers, but if you're out there for 20 minutes it's going to be very hard to keep everything from melting. When I ran my 3065 on track I had a very modestly prepped car (basic ducting, aluminum radiator, 90% water, water wetter) and I paid for it big time.. My laps times were pretty bad sitting off the track trying to cool off my overheated car. And for a taste of what it was like, I had the NA miatas all over me in the corners, but would destroy on the straights at 24psi. I felt like I was cheating because they had race prepped cars, with real suspension, etc. but guess who had faster laptimes?

The old saying: The instructor schools in a rental neon. Because everything is secondary to seat time, the setup is of little consequence. Just get out there. A year from now you'll KNOW what you need, and you can address it accordingly.

I found this to be true only on really wide open tracks with a few long straights. Most tracks favor the better handling car over the bigger horsepower car. And you're definitely right on about the heat issue. That's why I always preach lower power = better reliability and more enjoyment since fewer things break.

I personally think a BB GT30R or equivalent is as big as most will want to go for the majority of tracks, but some won't be able to resist the bigger HP allure. You really want full spool by the low to mid 3k mark if you can achieve it, and even that can be difficult to achieve with anything bigger than a 16g sometimes. I know I had a really good time with my BB FP3150 (50 trim with FP30 housing) and didn't suffer from lag. I'd always suggest a 16g or a BB 50-trim in most cases, or a GT30R-ish option for a little more power at the expense of lag in the corners. You can certainly go bigger than that but you'll need a good amount of money to make it work as well.

 

[Sam@RRE]

Motor is fine. I dont see why you have a 300sx with a HKS264/272?

But yes, that turbo is too big. And power level really depend on the track, if it has little to no straits, it would be pointless to have a 500whp car. More power, means you going to need more driver, more tire, more brakes, more cooling more broken parts. I would just shoot for a 300~350whp car, build onto suspension, cooling, and reliability. And seat time, seat time, and more seat time.

Last year in the RTA series we built a 650whp evo race car for a cutomer, full cage, carbon door, hood fenders whole deal. The come to find out, the kid had no track experience whatsoever. He ended up buying another stock evo, and learning in that at a stock level, and we upgraded his stock car as we downgraded to race car and where the cars met in the middle, he would switch over and we would raise it back up.

This was the car

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[Ludachris]

Motor is fine. I dont see why you have a 300sx with a HKS264/272?

But yes, that turbo is too big. And power level really depend on the track, if it has little to no straits, it would be pointless to have a 500whp car. More power, means you going to need more driver, more tire, more brakes, more cooling more broken parts. I would just shoot for a 300~350whp car, build onto suspension, cooling, and reliability. And seat time, seat time, and more seat time.

Last year in the RTA series we built a 650whp evo race car for a cutomer, full cage, carbon door, hood fenders whole deal. The come to find out, the kid had no track experience whatsoever. He ended up buying another stock evo, and learning in that at a stock level, and we upgraded his stock car as we downgraded to race car and where the cars met in the middle, he would switch over and we would raise it back up.

This was the car

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Kids with too much disposable income and no experience are dangerous. And they make me so jealous.

 

[brokedowntalon7]

Is anyone playing around on a road course with a .55 ar bep HX35? Just about to start the car up and am interested in how this particular setup typically fares on a road course.

 

[DSMpowerhouse]

Honestly if road racing is what you want to do, Id look to downsize to a 200 series BW turbo, to move your powerband a bit more in your favor. Also cant go wrong with BB 30 series garrett and FP turbos.

Otherwise more displacement, and higher compression could help you out, but you seem to have a motor ready to go for this car.

 

[Sam@RRE]

HX35 is a decent powerband for road course. Honestly, you can run fast and have a blast in a 200whp car. Its a different diving style, more just carrying momentum. But 4K RPM spool style turbos are great in road courses, preferbly linear power bands, I hate the turbos that hit like on/off switches that dont allow for throttle modulation around a corner.

 

[dsmusmc]

It would mean more money for another turbo but have you looked at a BW76/70? Its still a T4 and can find them for $600ish if you look around.

 

[dirtysouthpinoy]

Telling you evo3 16g is the way to go for your application. Fast spool enough top end for tracks

 

[ceedawg]

Telling you evo3 16g is the way to go for your application. Fast spool enough top end for tracks

Nah a t3 turbo setup would be out of the question since I spent all this money on this t4 twinscroll mani.

Honestly if road racing is what you want to do, Id look to downsize to a 200 series BW turbo, to move your powerband a bit more in your favor. Also cant go wrong with BB 30 series garrett and FP turbos.

Otherwise more displacement, and higher compression could help you out, but you seem to have a motor ready to go for this car.

Yes the 200 would probably be my best option provided I could get it with a t4 housing.

Motor is fine. I dont see why you have a 300sx with a HKS264/272?e RTA series we built a 650whp evo race car for a cutomer, full cage, carbon door, hood fenders whole deal. The come to find out, the kid had no track experience whatsoever. Hellll

This was the car

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All of your points are well taken. With my 300 ax turbo I was going to replace the 264 cam with a 272. Plenty are running low 10's with this combo. However my concern has become road racing which may make my 264/272 combo a good choice. The cam thing is still up in the air.
.

 

[Scott McIntyre]

I'm thinking my next build will be a 2.3 stroker with an FP3052 and HKS 272's. Does that sound like a good setup for the road course? I'm coming from stock 2.0 with an FP Big28.

 

[jrohner]

Nah a t3 turbo setup would be out of the question since I spent all this money on this t4 twinscroll mani.

Get a t4 t3 adapter on ebay.