Twins VS a Big Single??
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From: North Central Ohio
Twins VS a Big Single?? 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??
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??
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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.
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From: KS
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.
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From: Michigan
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.
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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.
still waiting for traps to back the claim
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From: KS
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?
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 $$$.
Tt usually the price is 3fold of a single. Tt will add significanly more weight and complexity.
Plenty of single cars out there getting it done.
Really it comes down to too many variable,space and $$$.
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
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
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?
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?
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
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From: KS
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.
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.
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.
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.
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.
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
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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.
This impressive as I would have thought 65MM Turbos or a 88MM single would have been necessary.
Thread Starter
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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?
Last edited by N2OBaby; Oct 31, 2012 at 04:21 PM. Reason: 1 more idea
FormerVendor
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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.
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.