Turbo's?

[demon2003]

I am gonna try to equip a lt1 from a caprice in my 86 Iroc. After riding in a 95 camaro with a beefed up Lt1 i decided that just a lt1 woudnt be enough but im a cheap bastard and i got the engine for 100 dollars i figure i can figure a cheap way to make it go faster. My buddy told me he would donat 2 grand national turbos that hae no shaft play and they are in great condition. My question is will a stock lt1 be able to push these turbos? Who makes turbo manifolds? is the swap in to a 3rd gen camaro gonna be very easy?I need a cheap way out so i need help on this suggestions comments and riddicule please!!!!

[Chris 96 WS6]

The big problem with the stock LT1 is the compression is too high to run a lot of boost unless you don't want the LT1 to live very long.

[demon2003]

so it would work ive been told the turbos are going to be to big? Im looking for hopefully a guy who has turboed a lt1 and hey what about the swap chris? ive decided to keep the lt1 manifold like you sugessted i have to find a computer but thats about it oh and does it matter if i use a camaro impala or caprice? the engine came out of a caprice.

[Chris 96 WS6]

Two GN turbos on a stock LT1 sounds like a lot to ask IMO. I'm not an expert on forced induction though.

I'm not saying it will or will not work, I'm just saying one problem you have from the start is too much compression = blown up motor with boost. I think if you have the time to put it all together, sure, it will run...but the question is how well and how long.

There's no differences between LT1 motors except the B-body cars got iron heads and a slightly smaller cam. Physically they are all the same though. Corvette motors got 4 bolt mains, but outside of that I guess you need to make sure the accessories all fit into your IROC engine bay.

Personally I wouldn't slap on a set of turbos on a $100 LT1 w/o at least cracking it open and going through it for a freshening. You want this thing to last, right? Also I think a set of forged dish pistons would be a necessity....boost on top of a high compression motor with hyper/cast pistons is not a recipie for longevity.

[demon2003]

to think i was gonna run nitrous on it too. way to smash this pipe dream to pieces. so this caprice engine has iron heads what kind of performance loss am i looking at because of that? jesus im just gonna do a few cheap mods cam headers and throw it in there and hope it works. you guys know anyone with a 3rd gen with a Lt1 running in it

[snakeoilperformance]

the compression is not a problem, if you have the right tuning. you make more power with the compression with less boost. the tuning is important. if you want custom made headers, pm and ill give ya our shop number. we make twin turbo headers all the time and can easily change the flange for a gn turbo. (we work on alot of turbo buicks also).

we just installed a twin turbo lt1 setup in a roadmaster wagon, talk about sleeper.. mad 480hp and 540tq to the wheels. monday

[snakeoilperformance]

oh wait and did i mention on a stock motor... bryan herter on the dyno

[demon2003]

oh wait and did i mention on a stock motor... bryan herter on the dyno

that's what im talking about do you know anything about swapping a Lt1 into a 3rd gen camaro it came out of a caprice. It has a wiring harness but i need a computer. And will the grand national turbos work for this application someone told me that i would need almost a 7.0 liter engine to broing the boost up in them let me know.

[LT1-TA]

that's what im talking about do you know anything about swapping a Lt1 into a 3rd gen camaro it came out of a caprice. It has a wiring harness but i need a computer. And will the grand national turbos work for this application someone told me that i would need almost a 7.0 liter engine to broing the boost up in them let me know.
just use one of them.. you woint ever need twin turbo on a stock motor. You will never need that much boost. Keep to a one turbo setup and it will spool hard and make power fast. TT is stupid IMHO.... unless your having a smaller turbo spool up for down low and a larger one to make the boost up high (basicly)..

The LT1 will bolt into your 3rd gen just like any other normal SBC... just hook up all the wiring and plug computer in and go (pretty much).

[snakeoilperformance]

the twins take less time to spool, and you can generally run more power with them. if ya kno what ya are doing.. you can always use less boost with 2 also.

[LT1-TA]

the twins take less time to spool, and you can generally run more power with them. if ya kno what ya are doing.. you can always use less boost with 2 also.

How do you figure? He is taking two of the exactly same turbos, and bolting them on... Think about using the exhaust to sppol those turbos up, then compare that to using the SAME AMOUNT OF EXHAUST to spool only one turbo. LOGIC... the one is going to spool faster. It is best suyited for this application...

Now if he was goign with a ton of horsepower (maybe 500+)... and running massive boost, yes, two smaller turbos instead of one massive one would be better. Then yes they will spool faster and you can run "less" boost. ONly reason they are better in this situation is that a smaller turbo may be able to make that "massive boost", but it becomes a choke point for the exhaust and will plateu off and stop making power before it should. In order to counter this effect you must get a larger turbo, which in turn makes it so you have to have longer spool times. Two small turbos will solve this problem in some cases.

It is an application thing. You cant say a twin turbo is better than a single. It depends on application. If your only runing a certain horsepower and boost, and it is somewhat low, a single turbo will be far better suited.

[snakeoilperformance]

how many turbo cars have your worked on?? with a single turbo it will have to be bigger and will take more time to spool up.. (which is why we use a 2step or a little bit of nitrous to spool it up faster)

with 2 smaller turbos the turbos themself take less time to spool because they are smaller. ALSO since they usualy are mounted to the headers themselfs there is less travel for the exaust to go to..

but im not gonna argue with ya. everyones got an opinion, all we do is forced induction on fuel injected vehicles at my shop. im not the expert, my boss would be.

take for instance, we worked on this syclone. he had one turbo a gt40 wit a 42 wheel and it took nearly 4 seconds or more to spool up.. we re did the setup and used twins, it spools in less than 2 seconds..

[snakeoilperformance]

How do you figure? He is taking two of the exactly same turbos, and bolting them on... Think about using the exhaust to sppol those turbos up, then compare that to using the SAME AMOUNT OF EXHAUST to spool only one turbo. LOGIC... the one is going to spool faster. It is best suyited for this application...

.


i read it again and realized yea, your right since he would be using the same turbos, the spool time would be shorter with just one of those turbos.

but he would make more power easily with 2 of them, simple as that

[LT1-TA]

i read it again and realized yea, your right since he would be using the same turbos, the spool time would be shorter with just one of those turbos.

but he would make more power easily with 2 of them, simple as that

Yeah... but his motor wont take that much boost... stock LT1... 6-7 #....

but yeah... your right, if his motor could take it, both turbos would make power

[ocshaman]

I think that you will be running not enough turbo for one, and too much turbo for two. Without getting into compressor maps, look at a turbo’s application. Take rpms and displacement into consideration. Will a turbo from a 3.8L engine work on a 5.7? Yes, but you will probably run out of turbo, or overrun the turbo. If he is just giving them to you, I would sell them, and either get a turbo built for you, or spend some time on turbomustangs.com reading in the JY section and the GM section. Look at the thread by me in the JY for turbos that would be a little smaller, or you could always rip off a diesel turbo. Because it was at the beginning a mustang site, a lot of the setups will be Ford. Look for the 351 or 5.8 setups. That being said, there are a lot of GM guys boosting things, and they would be helpful too.

[LT1-TA]

I think that you will be running not enough turbo for one, and too much turbo for two. Without getting into compressor maps, look at a turbo?s application. Take rpms and displacement into consideration. Will a turbo from a 3.8L engine work on a 5.7? Yes, but you will probably run out of turbo, or overrun the turbo. If he is just giving them to you, I would sell them, and either get a turbo built for you, or spend some time on turbomustangs.com reading in the JY section and the GM section. Look at the thread by me in the JY for turbos that would be a little smaller, or you could always rip off a diesel turbo. Because it was at the beginning a mustang site, a lot of the setups will be Ford. Look for the 351 or 5.8 setups. That being said, there are a lot of GM guys boosting things, and they would be helpful too.


He would be probly totaly fine with jsut running one of those turbos just because he is only gunna be able to run 6# of boost and have it live long. THe stock GN run 15#.

He does have a larger motor and may be real close to the surge line (may hit it, but it is hard to say unless you get the comrpesser maps for that turbo). Since he is running low boost though, I bet the turbo would work jsut fine.