Shorty headers+custom mid-section, borla 4-tip stingers, donaldson blackwing, shortened stock shifter (sorry, those aftermarket shifters are just too notchy).
I am not a big drag racer. I don't need explosive acceleration from a dead stop.
I am contemplating a custom single turbo (the shop wants to use my car as a test bed to fabricate a complete single turbo kit).
I have been in a couple of Z/06's that have been TT'ed, but I was not impressed by their lack of ability to lay down the power in street trim (street tires). Dyno queens? Yes. King of the Road? No.
I did a couple of searches to find comparisons of single turbo setups vs. twin turbo setups on Z/06's and came up with nothing.
Does anyone here have any insight on the single vs. twin turbo comparison? What are the pros and cons of either setup, and will a single turbo system still be streetable at low rpm driving?
A hefty info request - thanks to all who provide feedback!
First of all, dont let your car be a test dummy. I have seen too many people try to make a reliable and cost effective turbo kit for our cars and fail. Second, it will take a LONG time to develop one. If you can leave your car there for months, then go for it.
Second, a single turbo is not as good for daily driving. The boost takes longer to come (later in the rpm) and when it comes, it hits hard. With a twin setup, the first turbo spools up in the mid range and the next one up top.
With a big single, all that power is gonna hit at a certain time, say 5000rpm. The power band with a single will not be as spread out. Its very peaky. You will have maybe a 2000rpm band of power.
I wouldnt do any type of turbo without doing forged internals and lowering the compression. It can get VERY expensive once you add everything up.
From what you seem to want, I would suggest a decent heads/cam package. You want to get rid of the shorty headers and get long tubes. A decent heads/cam package should be around $5000-$6000 installed.
well if you want power all over the curve you gotta get more cubes. try to go with a 382,383,387,396,406,427,436, pretty soon there will probably be a 454 Ls6. no replacement for displacement!!
1BADRIDE- If you could start with a clean piece of paper to design an optimum turbo setup on a V-8 motor you would do a TT, not a single. However, the singles are out there and bang for the buck do a great job. Budget's do get in the way but singles work. Buick grand nationals are a good example. I do agree with above that a forged motor and lowered compression will give dividends in power and longevity of the motor. Good Luck
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RICK 99 FRC, LPE C5-R 427 TT from 21st CMC, LPE Minitubs, Boost Controller. A ZO-6 Prototype. Born: 12/3/98 725 RWHP 800 TQ
Originally posted by sil350 well if you want power all over the curve you gotta get more cubes. try to go with a 382,383,387,396,406,427,436, pretty soon there will probably be a 454 Ls6. no replacement for displacement!!
I beg to differ. There is a replacement for cubic inches.........it's cubic dollars. Take Rob Raymer's old Camaro. It ran in the nines, without any weight reduction, on a 346 ci motor. That's impressive. Another replacement for cubic inches is BOOST. just my opinion though, not looking for an argument.
In answer to the posted question, the stock rods/pistons seem to be the weak link. Andy at A&A Corvette sells a built short block for $3k (not a forged crank, but they're supposedly good to 800BHP). If you get this with a set of 6 liter heads to lower the compression, and then put a turbo (or an ATI) on, you'd have a car that ROCKED. Also don't forget that if you put any type of FI system on, don't neglect the fuel system, because if it leans out on you, you can say goodbye to your new motor (especially if it's boosted). Tuning is also critical. Good Luck!
there are so many options out there and more coming. Don't do what I did and talk to all the folks you can and make sure your system can be upgraded if you want later when you want more power........................and you Will
Originally posted by kumar75150 First of all, dont let your car be a test dummy. I have seen too many people try to make a reliable and cost effective turbo kit for our cars and fail. Second, it will take a LONG time to develop one. If you can leave your car there for months, then go for it.
Second, a single turbo is not as good for daily driving. The boost takes longer to come (later in the rpm) and when it comes, it hits hard. With a twin setup, the first turbo spools up in the mid range and the next one up top.
With a big single, all that power is gonna hit at a certain time, say 5000rpm. The power band with a single will not be as spread out. Its very peaky. You will have maybe a 2000rpm band of power.
I wouldnt do any type of turbo without doing forged internals and lowering the compression. It can get VERY expensive once you add everything up.
From what you seem to want, I would suggest a decent heads/cam package. You want to get rid of the shorty headers and get long tubes. A decent heads/cam package should be around $5000-$6000 installed.
I have to disagree with your statement about singles...I have a single turbo kit putting out 580/580...it is far from peaky....I see boost at 2200rpm and max boost (12psi) by 3200-3400 rpm...my power curve is like a table top... over 500 ft-lbs of torque over a 2000 rpm range and no drop off at the top end (power pulls cleanly to 6000rpm). If you wanted a single there was only one option. There are more twin setups coming out soon...time will tell how good they are.
Just an update to those who replied... Single turbo kit is 85% complete! Final "prototype" kit will be in August 1st, then I'm sending out all the custom pipes to get made in 1 pc tubing and get a jig made, then I'm installing and hitting the Dyno with a wideband setup and LS1Edit.
Stock internals! Stock engine! I'll post the results soon.
Thanks to everyone who helped me with my research. It has been a LONG project!
What turbo unit are you using?..I just switched to a t76 gts (from a t71 gtq) and picked up 40rwhp and 60 rwtq. I am firmly of the opinion that this is the perfect unit for stock cube motors. It gives good power at low boost levels and allows for tremendous upside on stock cubes (1,150rwhp).
When I move up to a 427ci Darton, I will be switching to a T88 to reduce backpressure.
PT76 currently for sale in about 1 month (big cubes baby)
Second, a single turbo is not as good for daily driving. The boost takes longer to come (later in the rpm) and when it comes, it hits hard. With a twin setup, the first turbo spools up in the mid range and the next one up top.
With todays turbos, turbo lag is really existent.
But you are confused on the twin turbo setup. When people talk about twin turbos they are usually referring to two turbos. Each driven by one bank of cylinders.
The twin turbo setup you were referring to in your statement is a sequential setup, like that found in stock Supras.
The advantage of twin non-sequential turbos is that you can run two small turbos and get insanely fast spool-up.
Looking foreward to see how this turns out! Post some pics and numbers please.
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