N2OBaby

I spend time here as well as reading GMHTP mag.

I haven't seen conclusive proof which is the better route for a streetable 9-10Second car, a Big single Turbo like a GT91 or PT88 or a pair of smaller Twins like Garrett GT3582Rs or Precision 62/62s or Turbonetics TC76s .

What do Ya'll have??

What do Ya'll suggest??

jridenour31

As far as streetability goes, it's pretty unanimous that twins are more responsive than a single but a properly sized single will also be quite responsive. Personally, I would just go with whatever is easier to package. Sometimes one side has no room whatsoever, making a single the obvious choice. However, fitting a 4 or 5 inch downpipe can be a packaging nightmare and two three downpipes might be he way to go. I don't really think one choice is significantly better than the other. Both can get the job done very effectively.

a4ls2goat

it all comes down to space.

if i could do it again, i would go with 2 6262s.

also, what are your power goals?

dudeman

iTrader: (43)

a smaller single could get you the times you are looking for a still spool quick. and you wouldnt be buying two turbos, bovs and wg's.

2000RATA

Twins hands down. I have twin 6165 Turbonetics ball bearing turbos. The response can only be described as exposive. Not just good but violent. Badass set of heads and the right cam. I had head flow numbers in hand before the call was ever made to the cam grinder. See my sig. That's 945 RWHP at 14.1 psi. Not 18 or more. The key is the combination. The cam and heads are where it's at. Too many people miss this. Shelf grinds will not work well except for the combination they were engineered for. Can't stress this enough.

shawnc16

Cost is usually a bigger factor than anything. Depends on how much you're willing to spend. Twins are more expensive than a single. Its not just cost of the turbo, its the plumbing and everything else you need. Find out your budget times it by 5 and see what will fit into it.

jt76

iTrader: (10)

I'm making the switch. The idea of a big hp number on pump gas with the responsiveness of the twins sealed the deal for me.

rotary1307cc

iTrader: (5)

yes singles suck and the response is horrible


still waiting for traps to back the claim

2000RATA

Not saying single turbo setup sucks. Just that twins will go farther quicker and faster. Nothing whatsoever against singles.
And my "claim" is no less real than any one else who posts a dyno video. Alot of guys doing 1000 rwhp with 61 and 62 compressors. Check out nelson racing. Are their dyno videos just claims?

NemeSS

iTrader: (127)

A mid or big single will get it done.
Tt usually the price is 3fold of a single. Tt will add significanly more weight and complexity.
Plenty of single cars out there getting it done.
Really it comes down to too many variable,space and $$$.

SKULL

iTrader: (7)

Just add up

Space
Budget
Material

Personally neither is the wrong choice. Both will make the power you want. Both are streetable. Just do your homework and make sure you have a very well matched setup

skinnies

iTrader: (33)

How heavy of a car and how fast(mph) are you really wanting to go?

rotary1307cc

iTrader: (5)

Not saying a 61-62 wont make 1kwhp, obviously not the case

but 950whp on 14psi, on a 378 with 317s,..... yeah i would put my money on that your trap will not back that claim.... happy dyno is what i would call it

you are comparing a 317 378 to a nelson setup? whoa

2000RATA

Not sure why your hating. You got guys posting dyno videos with stock 317's making 1000whp. Make sure you tell them they are making claims as well.
My 317's flow as much as AFR 225's. I have been porting heads and building engines for 20 years. Its what I do. Do you see something halfassed in my build? Why would my results be halfass?
To the OP sorry for the hijack.

NicD

iTrader: (7)

Here is a good comparison for you...

5.7L with a single 76 GTS vs a 6.0 with small twin 2871Rs

Which one spools faster and makes more power? Based on the responses lately on this board I would bet 90% of you would say the twins.

To the OP, you certainly don't need a big single like the ones you listed for your goals. I'm doing just fine on a relatively small 76 GTS with a stock cube LS1. That's not to say I wouldn't go bigger now a days but this combo has been rock solid for 7 years now.

rotary1307cc

iTrader: (5)

No **** people make big power on 317s, do you see them claiming 950 on 14psi?? Lol


Your misleading people into thinking that you have some super special combo and that twins are the end all


At this power level you take a pair of twins and put it up against a single of similar turbine and compressor capacity as the twins and you think there is going to be a big difference in power or spool you are nuts

N2OBaby

I just purchased from Ebay the July 2008 issue of Super Rod mag. They had an article where a stock looking '02 Camaro was running 9.0's with a pair of Turbonetics 60-1 on a +.060 over LQ9 with AFR 225 heads on pump.

This impressive as I would have thought 65MM Turbos or a 88MM single would have been necessary.

rotary1307cc

iTrader: (5)

Like said above it comes down to packaging. Twins are easy to package alot of turbine compared to most singles

N2OBaby

I would like to start at 600-750 FWHP and grow from there without having to buy biggier Turbos.

rotary1307cc, I like the idea of a fast spooling 390-403 Cid LQ9 in a 3500 LB 4th Gen Camaro or Firebird/TA.

Will a Iron block survive for long with 800-900 RWHP?

Chris@CBR

Rotary1307cc : It's simple math really, 378 cid x 1.4 hp per cube = 529.2 hp N/A.
That's not to much to ask out of a 10:1 378 with a good set of heads with the right piston
and ring package.
AS a good rule of thumb 14.7 psi will double the N/A hp if good fuel is used.
529.2 x 2 = 1058.4

So 945 hp is about 10% less than 1058.

Give or take a little the math works the numbers are real.

If you are having trouble making power without inflating you silicone couplers
like party balloons we can help you.