I have everything cleared out of the way for two turbos My two options, two TE62's or two GT40's. The 62's will be good to about 1200hp. The GT40's are good to 1400hp. However the GT's run about $1000 more for the pair.
My main question is, how much power can be used on the street? Im thinking 1200hp will never be tapped till around 100mph if that. Im wiilling to spend the extra G but if I will never use the extra 200hp its not worth it. With out the car being tubbed, those of you that have experianced this power how much can be used on the street? Then a question about the LT1 anyone know of the most power a LT1 block will hold? Baxer hit 1200hp I believe and it held together, anyone hit more then that?

I have been though so many combos I would like this to last awhile

 

i dont exactly know the hp limit of an lt1 block but 1200hp is a hell of alot of ponies Id imagine youd want to use a 4-bolt block with arp studs, or a splayed type setup, and forged everything from crank and pistons down to forged air cleaner wing nut let us know how it turns out. Im currently working on plans for a PSI inclined 350 myself, and am interested how your process goes.

 

I've only put about 100 miles on my TT SBC 427, and I haven't gotten anywhere near applying full boost/WOT to the street. My engine made 1201hp @ 6600rpm on 93 octane with around 20-22 psi of boost and a mild tune. With a leaner tune, a couple more degrees of advance and a couple more psi of boost, I could probably get it in the 1400hp range but as you already mentioned it's a real challenge to apply it to the street.

Since dyno testing and tuning, I've since added a boost controller and swapped the 20# wastegate springs for 7# springs. The combination of lighter springs and electronic boost control make it alot easier to manage since I can cruise around with minimal boost, but easily turn it up to "kill" mode if I wanted to, but even with low single digit boost, it's a handful on street tires. I think it really a matter of how you drive it. If you're not aggressive with the throttle, you can drive a 1000+hp turbo car around pretty easily, but if you drive like a jackass, you'll end up killing yourself and/or others because it's ALOT of power. It's easy to build an engine that will make the power, but actually living with it is another thing. To be honest, just the thought of launching the car under full boost/full power (assuming the car could even take it wighout breaking something) makes me nervous. I know a guy who races in NHRA and he was commenting that his 8 second tube frame racecar makes about the same amount of power.. Anyone who has ever actually been behind the wheel with that much power knows how violent it is.


I wouldn't recommend a factory block either, you'll need something like a Dart Iron Eagle or GM Rocket block.

Good luck, and if you decide to do it, take alots of pics and show 'em off to us.

 

ding ding. Can you use 1000hp @ 5mph? no.

so you just gotta use your head. at 100mph, you will start to be able to use it. a good driver with good throttle control can ALMOST never have too much power(assuming its tuned to come in smoothly) b/c he or she will only use the throttle posistion that allows max acceleration(with minimal wheel spin).

my 500rw NA 401ci motor was no where near enough power for me. on 200shot, it was downright scary. hence the new turbo build up, I want downright scary all the time

 

This is also being discussed in "Advanced Tech" with some interesting responses. Jordan's points are (as usual) well made. But people are talking about two different things, I think. Those in the "too much" camp are saying "what is the max hp you can use on the street". Since, as Jordan is pointing out, you have built in traction control (your right foot), you can use a car with almost any amount of hp on the street, if you don't use all the hp.

Is this clear or muddy? Some are correctly pointing out that you can't use more than XXX hp on the street. Others are correctly pointing out that no matter how much hp the car has, you don't need to use it all. As for me, 600rwhp (without the N2O) wasn't quite enough, but 733rwhp with the N2O was plenty. This year I should have ~700rwhp without the N2O, I think that much will be usable because it won't hit as hard, which relates to the the issue of controllability. Will I want more? Only time will tell.

Rich Krause

 

How many ci are you planing on having because there is a limit of hp per ci, by theory. You can always run an extremly low sub 7:1 cr but then you wil lack down low before boost because of the weak pulses and less squish, but it will allow you to run more bost at higher rmps therefore more power. But it will be a bit sloppy at low rpms. I wouldnt build an engine for max hp because nobody racs dynos. When i build my turbo engine my goal will be to make it a fun car to drive with good throtle reponse and mimnimal turbo lag, While still making +650 rwhp.

Monty you built a 427 twin turbo 1200 hp on pump gas is that running close to the limit before detonaion on 93octane? And off subject monty when are you going to slap some fat slicks on that monster take it to the track and get some times

 

I'm not really running a radical tune, a 12.1:1 A/F and 23.5* of advance at max load/boost, so it should have plenty of safety margin against detonation. We pushed it pretty hard on the dyno, up to around 7500 rpm, and it was hot as heck in the dyno room, in excess of 100F that day and never heard or detected any pinging with a knock sensor. I'm only running a 2-bar MAP for better tuning resolution, and it gets maxed out at around 5700 rpms, so I can only estimate what the maximum boost was. We figure around 20-22 psi. I estimate I could probably take a couple more psi of boost, lean it out a couple tenths and add a few more degrees of timing. Assuming I can keep the IAT's down where they are now, less than 125F, I figure it would probably make somewhere around 1300-1400 on 93 octane, but I wouldn't push it much further than that without going to 100+ octane.

 

"downright scary". That' when it's fast enough for me. LOL



You said 500rwhp was no where near enough power for you , and the 200 shot was "downright scary".


With the 200 shot it's scary......, I was just curious where does the 500rwhp fall on the scary chart . Was it a little scarry , kinda scarry , not scarry at all, on the border? (serious question. LOL)

 

once I got used to the 500rw, it was boreing. like driving a stock car, just faster.

 

Is your only goal to have rights to a 1400hp so called daily driver or do you want a street/strip car. It would kind of suck when Jordan comes up in his black rocket NA 500 hp and wast your 1400hp car due to no traction. There are so many battles to cross with this project from motor build, fuel, programing/ECM, traction/susp, brakes,rear, TRANNY, and on it goes. None the less having all these fabed parts work reliable. You may as well go buy a 911tt send to RUF for mods and save some money. Monty is the only person i have heard of to accomplish this . Limits of the street all depends on who you are. For me i say anything over 600rwhp is in the area.