I am a 3000GT VR4 owner but have greatest respect for Vettes. ZO6 is a truly evil and mean creation...But what's bugging me about your cars is - when you TT them. Why is your boost set low? With your huge displacement you can truly take advantage of the setup and just blow away everything that's moving on Earth. Our cars stock run 15 psi...with proper mods and alcohol injection they hit 30+...And Supras are known to almost double that figure. If we can squeeze 1000+ HP out of our 3 L. engines then I can't even imagine what your cars are capable of. Although, in our case AWD helps the traction which I guess can become an issue with overpowered RWD. Is there such a thing as too much power? Most of our guys believe that for the car to be fun on the street it should have 500 AWHP, everything beyond that is not street friendly and belongs to the strip ( just like single turbo Supras, which are dogs first 4-5 seconds...but after these 4-5 seconds you are heading to the moon). Although, I know a guy whose 900AWHP 3000GT is a daily driver. Back to the question...Do you guys run high boost? (25-35 psi) ...I am really curious what your cars can do with such application.

 

 

CR is higher on LS motors.

 

The stock Z06 motors have too much compression to run a ton of boost, but they are making 600-700hp with well under 10psi. A built 427 will easily hit 1000+ hp at 20psi.

So to answer part of your question, the big displacement turbo cars don't need to run the same amount of boost to match the smaller displacement motors. Also, keep in mind that boost is a measure of restriction; 20psi of boost on a well flowing setup will make more then 20psi on a more restrictive setup since the overall airflow will be higher with less restriction.

There are a few LSx builds that are creeping up on the 2000+hp number (drag racing cars, not daily street drivers as far as I know) and I am sure that we will be seeing boost numbers in the 35-45psi range for these efforts.

To date the biggest weakness in LSx technology has been holding the heads down on the high hp cars. There are several aftermarket blocks and heads that have added additional head bolts to surpass this limit and they are working well from what I have heard. The cylinders also tend to shift a bit when making big power and we are starting to see the blocks come with very thick liners to combat this issue.

So, high boost is making its way in on the big dogs, but there are a bunch of street LSx cars around that are running in the 20psi range ;-)

 

What Phate said is spot on... The LS series V8's in our cars are a way more efficient air pump than the engines you mentioned. I've owned a 550rwhp '91 300zx TT and a 1000+rwhp '97 single turbo supra. They are Great platforms, the Supra more than the 300, but I loved them both...but it all comes back to IC motors being a big air pump. Larger C.I./C.C. motors are USUALLY more efficient, in this case for sure...
With the motors making similar power levels it comes down to oil, bearing, parts, etc failure. BIG rwhp takes it's toll...


To give you an idea of how efficient these engines are... My car with a bone stock LS2 bottom end, stock heads, + small blower cam makes 713rwhp and 645rwtq at 9psi...

 

[QUOTE=Phate;1565401737] Also, keep in mind that boost is a measure of restriction; 20psi of boost on a well flowing setup will make more then 20psi on a more restrictive setup since the overall airflow will be higher with less restriction.

yeah..I know that..15 psi on our stock turbos and manifolds produce less than a third HP of the bigger turbo upgrade on that same car at the same boost level. They just flow a lot more air and air is what counts.

At what point do you start experiencing traction issues on street tires? I've never driven a RWD car that powerful. I personally prefer the looks of a Viper...I think it's a little more exotic, but performance wise I would rather drive a new ZO6. The things I love about your platform besides performance is that it's got History!!! Years and years of making, evolving and perfecting. And they just continue to get better and better. The downside is that I think your engines could be more efficient ( compare the displacement vs/ power output to Porsche's - these guys can squeeze out crazy numbers out of modest displacement engines)..But again, maybe that's the beauty of a true American muscle car . and it also leaves some play room for car enthusiasts like yourselves. It's cool to see a nice Vette on the street, occasionally race one...Sometimes I win, sometimes I lose but the fun is what counts. Good luck with your endeavors. Respect.

 

At 550rwhp or so, I have traction problems until third gear or 80mph or so. The vette is a very different car than some that you have mentioned. It will idle nicely on the way to the grocery store. Your mother will ride in it because its not rough. It will do hundreds of passes down the drag strip and many track days without a problem.

 

Very true, plus the Corvettes get close to 30 mpg on the highway to boot. Bob

 

people have run MAJOUR boost (30+psi) out of the Warhawk. nelson racing can do it for you no problems. it will net you about 1800bhp on race fuel. liek others have said, all you need to do then is find a way to put it all to the ground!!

Chris.

 

I paid $4.16/gallon for 93 this am

 

can probably be more than that...We have a guy ( Matt Monnet) who runs 8's , his car has well over 1000 HP at the wheels ( pure turbo, no NOS) and this is with the engine half of your size...

 

is this a 3000GT VR4??

CHris.

 

dude where have you been? you still up in WA? Nice to see you back on the boards!

 

Generally speaking - larger Displacement motors don't run nearly as much boost as smaller displacement engines due to VE and, well, size.... Add on top of that the OEM CR and we can't run much boost... (but can still make uber power)

Of course, forge the bottom-end, drop in an efficient/boost friendly cam, and drop the CR...

I put down 1,070 RWHP at 21.5 Lbs of boost on 427 CI. (9.2:1 CR on C-16)

 

yeah,it is..well, it's actually a stealth but it's the same thing, the same platform..And even though it's Dodge , they were made in Japan.

 

[QUOTE=EdwardETraylorIII;1565440243]Generally speaking - larger Displacement motors don't run nearly as much boost as smaller displacement engines due to VE and, well, size....

What about the top-fuel dragsters then?

 

[QUOTE=Twinblown;1565440872]Top-fuel is an entirely different animal:
- The motors are supercharged, not turbo. It takes 900hp in loss just to turn the blower
- These guys are running 44-50 psi at WOT
- The motors are making about 8000hp
- The motors are right around 500cid
- Run once and pulled apart

 

Hey Mark, yeah still back and forth between here and WA for work. I'm home for the day and heading to Dallas for the rest of the week.

How are things with the car?

 

In addition to what Phate said..

The funny cars run Nitromethane!

To the OP - I can't help but think you're trying to start some **** with a response like that after we all explained it. Then again, maybe it was a legitimate question by someone who is simply trying to learn.

Hmmmmm

 

Vettes can run just as much boost if they are built to do so, the difference is we don't need big boost to make big power.

A modest 14-16psi is about all that is needed to spank just about anything you're likely to find prowling the streets.