1SlowSi

Well i have done my search and done more than enough reading. Right now i have a stock B16 that im putting this on. Within a couple months or so i will having a B18B block put on bored out to 83mm, rods, sleeved ect. Redline will be 8200. I want to run around 280whp daily. (7-8psi) sometimes in the 300's, and at most after my motor can handle it, 450whp. no more. Which turbo would be best for me. I WOULD like a somewhat smooth powerband. I want to be able to make this power without MAXING out the turbo, and trying to keep it under 20 lbs of boost.
I am looking at the SC34, SC60, or Sc61. Hell maybe even the GT35E. How much of a difference would there be from the 57trim vs. the 60 trim? And yeah i know the SC61 is nice, im sure that will come up a thousand times. But not at 8-10psi daily. Thanks for any help you can give.

I just want to add... PUMP GAS. and i want it to pull nice all the way to 8200-8600 or so. No drop off in power.


Modified by 1SlowSi at 9:59 AM 1/28/2004


Modified by 1SlowSi at 10:03 AM 1/28/2004

JGurr81

You will be able to do that with the SC34, i think. But then again since your getting the B18 block in a couple of months you might want to wait and get the SC61. It will spool nicely and have the top end. Its the most efficient SC out, so its going to make more power per psi period even if its only 6 or 7 or 8psi. I dont know if you could get 450whp with the SC34 without turning up the boost alot. But if your running 8-10psi daily(which btw you can run more) the SC34 will give you the numbers you want and have better spool time than the SC61. The difference in spool time will only be about 500-800 rpms though. Both are great turbos!!! Only reason I dont think the SC60 will be good is just because I think you could go for the SC61 and it would be better! Hope that helps. BTW pm Arturbo, hes great. So is DiRep972!!!

G"UNIT

i have the sc34 and i love it. i have a stock b17 motor. my freind has a ls/vtec with hondata and pistons and rods and a built head and he has the sc61 and its real nice. i dont no his numbers off the top of my head. his car is alot faster than mine. but go with what you like........

1SlowSi

Im going to have to sacrafice something. You know what? If the SC34 would get me 400whp on pump gas and at or around 20lbs of boost i will be fine with it. Something im looking at is the SC52. Its rated for 600hp, has the T350 turbine wheel, BUT... has a 60 trim comp. Between the SC52 and 61, which would spool faster? cause it seems like im only needing a 40-50whp leeway. SC52 seems like it would do fine. I wish it had a smaller trim though. Any owners out there?

Or.. GT32, GT35. Will the Gt32 make more power than the SC34? A guy at Precision said that the GT35 would make more than the SC61, dont know about that though. Im willing to pay the money, but is it really worth it.

1SlowSi

At how much boost do you think i would need to use race gas? approx amount. Any SC34 owners wanna throw in their $.02?

1SlowSi

Do you think that i can make 400whp on pump gas with this turbo? At how much boost do you think iLL need to run race? thanks.

Rod Short

You pose some good questions. Remember that all of the hp ratings we post are peak ratings at the flywheel. Figure you'll have a 20% loss of power thru the drivetrain, so a SC34 that's rated at 545-hp for example, should give you 436 peak hp at the wheels -- with proper tuning. The same goes for all turbos. The biggest and baddest SC61 is rated 680 peak hp at the crank, which means you should get 544 peak at the wheels.

Is a 20% frictional loss of power thru the drivetrain an accurate figure? It varies from vehicle to vehicle and could certainly be less, but seems to be a good number for a worst case scenario. I use 30% for AWD vehicles. People that have a chassis dyno and tune everyday could probably give a better answer on this.

The other issue you run into here is wanting to get power at such low boost. To do this, you need a lot of volume. In other words, a larger turbo than what we might normally suggest. That's great for hp at low boost levels, making power all the way to your redline and not maxing out your turbo, but not so great if you're concerned about lag time.

Another consideration is your engine size. A stock B16 is on the marginal edge as to whether you should go with a T3 or T25 inlet. You just don't have a lot of energy to spool the turbine. The B18 would definitely be a step in the right direction.

If you wanted to go with an SC61, I would suggest the smallest one with the T350 76 trim wheel which can support 630 peak hp or 504 peak at the wheel. At lower boost levels, I guesstimating you'd get 400 or so at the wheels. It's efficient, capable of more power and all that, but I reallythink you be happier with the SC34 if you wanted someting that's fun in a daily driver. Just my thoughts.

Oh, on the GT35E, Inline Pro tested this for us and found that it spools about the same as the SC61, but gave 50 more horsepower. This has the GT wheels and both ends. We expect this will start displacing the SC61 more and more.

Hope this helps some.

Rod Short
Sales Manager
Precision Turbo

1SlowSi

Yeah that seems to be the problem is i want too many things out of one turbo. Its not going to happen from what i see. The SC34 would be probably be great for me for daily driving, and will get the numbers that i want, but for 400+ it doesnt seem to be the right one to go with. what about the SC52 which is rated for less, has the T350, but it has the 60trim.. how would that lag be, vs. the SC61 on my motor. I will have a B18 bored out to 83mm. (1.9L) or so. It just seems that i need something in between SC34 and SC61. I guess the biggest thing out of all this is only running a turbo that big at only 7-8 psi for daily use. But still wanting 400+ by 20psi. hmm. If the SC52 can spool a tad bit faster than the Sc61 then ill go for that. I want a nice powercurve though, not a sudden BLAST of power at 5000rpms, like i see in most dynos. We'll just have to see. Bigger will just give me more room for the future. For the SC34 would 400whp be pushing it you think? and could that be accomplished by 20psi? if so then im sold on that. As far as HP loss through the drivetrain i think its like 15%.. im not sure. ill search for it.

Rod Short

Yes, the SC52 will definitely spool quicker than the SC61. The basic rule is this: the smaller the wheel size, trim and A/R, the quicker the spool and the quicker you will max the turbo out. As for how much difference there would be compared to the SC61, I really couldn't answer that accurately. Suggest you talk to some of the dealers that install and tune turbos as they would have more practical experience.

Rod Short
Sales Manager
Precision Turbo

4-banging

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rod Short &raquo;</TD></TR><TR><TD CLASS="quote">Yes, the SC52 will definitely spool quicker than the SC61. The basic rule is this: the smaller the wheel size, trim and A/R, the quicker the spool and the quicker you will max the turbo out. As for how much difference there would be compared to the SC61, I really couldn't answer that accurately. Suggest you talk to some of the dealers that install and tune turbos as they would have more practical experience.

Rod Short
Sales Manager
Precision Turbo</TD></TR></TABLE>

what are the basic different characteristics between the T350 and T04E? with a b16 bored to 84mm would you go with the T04E?

TheShodan

iTrader: (14)

Hey Rod,

Though the GT35E my have 50hp moreso than the SC61, did the guys at Inline Pro find where that increase was? I have several customers going the way of the SC61 but if it may be phased out, what are other supposed advantages?

Arturbo

Rod, it was 15whp not 50whp. Its ok, at your age your hearing is going away. Don't worry I'll find you a young girl to make you feel young again.

art

1SlowSi

can anyone help my dilemma? ya know im thinkin too much about this. bump this ****. SC61 is too much for what i need. nice numbers, but too much hp for my kinda driving. I need this car to last a while. ill only run 8psi daily. and 15 or so for fun and just enjoy that. Maybe later on in life ill get the bigger one once i get tired of the SC34. All i wanted is 400whp on pump gas. maybe ill do some tuning with C16. Ill sacrafice. Thanks for the help though Art and Direp. and others too!