Turbo for DD LY6 suggestions
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On The Tree
Joined: May 2008
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From: Michigan
Turbo for DD LY6 suggestions Putting a stock LY6 into my 91 camaro. 3300# with a T56.
I'm only looking for about 550rwhp. What I really want is instant boost and big gains in the 2500-5000 rpm area. Its going to be a drive to work/beater car.
I've done a lot of looking and 76mm seems pretty popular but supports way more power than I need. But, I know I also don't want to be near the limits either due to heat.
I have lots of semi turbos around.....
I'm only looking for about 550rwhp. What I really want is instant boost and big gains in the 2500-5000 rpm area. Its going to be a drive to work/beater car.
I've done a lot of looking and 76mm seems pretty popular but supports way more power than I need. But, I know I also don't want to be near the limits either due to heat.
I have lots of semi turbos around.....
Thread Starter
On The Tree
Joined: May 2008
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From: Michigan
Maybe my question is too boring bc I didn't say 1000 rwhp.
Alot of suggestions are a 7675 turbo. I'm wondering if a 72 cold would be better. I never plan on hitting 700 whp. Been there done that, too much for the street.
I'm going to keep the VVT. I don't know what effect that has on the turbo.
No I'm not considering using a semi turbo.
Alot of suggestions are a 7675 turbo. I'm wondering if a 72 cold would be better. I never plan on hitting 700 whp. Been there done that, too much for the street.
I'm going to keep the VVT. I don't know what effect that has on the turbo.
No I'm not considering using a semi turbo.
Even bigger turbos on a 6.0 come on around 2500 RPM. If on a budget I would be looking at an S300 series BW. I think that's a semi turbo but they work. A 7675 would work great too. Both of those at 10 PSI will be pretty efficient and hit your numbers easily.
The VVT can be good for the turbo but it's and extra tuning variable that your tuner has to be comfortable with.
The VVT can be good for the turbo but it's and extra tuning variable that your tuner has to be comfortable with.
Thread Starter
On The Tree
Joined: May 2008
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From: Michigan
Even bigger turbos on a 6.0 come on around 2500 RPM. If on a budget I would be looking at an S300 series BW. I think that's a semi turbo but they work. A 7675 would work great too. Both of those at 10 PSI will be pretty efficient and hit your numbers easily.
The VVT can be good for the turbo but it's and extra tuning variable that your tuner has to be comfortable with.
The VVT can be good for the turbo but it's and extra tuning variable that your tuner has to be comfortable with.
I've been considering the on3 76mm and 78mm. I know the 76 might have back pressure issues on top end with its small 65mm exducer but it will be fairly rare to go above 5k rpms. I'm more concerned with spool time, midrange, and heat. Of course I don't want to be in boost cruising down the highway either.......this is where I need help choosing.
Thanks for the help.
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From: Portland, Oregon
I would not hesitate to use the BW snail. Don't leave it hanging off your exhaust, give it a support of sorts, and enjoy it. If you prefer to use something like the On3 turbo, then I would use the 78mm, just to mitigate any heat or backpressure issues before they arise.
Be careful with the vvt and boost. The vvt system cannot fight against heavy valve springs, so you need to be mindful of finding spring pressures that still control the valves with boost pressure but do not interfere with the operation of the vvt system. If I remember correctly, the PAC 1218 or Comp 918 springs work with the vvt, but I do not know if any others that work with it, for sure.
Be careful with the vvt and boost. The vvt system cannot fight against heavy valve springs, so you need to be mindful of finding spring pressures that still control the valves with boost pressure but do not interfere with the operation of the vvt system. If I remember correctly, the PAC 1218 or Comp 918 springs work with the vvt, but I do not know if any others that work with it, for sure.
Is this your first LS? The only reason I ask is your 5000 rpm cap. The heads on that motor will support 7000 rpm. One of the reasons the LS platform is great is they easily and smoothly rev even in mild form. It would be a shame to short shift at 5k.
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Thread Starter
On The Tree
Joined: May 2008
Posts: 160
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From: Michigan
I just don't drive that way anymore. Didn't ride my gsxr600 for years bc I hated how high I had to rev it.
A 600hp 496ci would suit me better but this LY6 will get better mpg. I mean, I can afford the gas, I just can't keep my brain from stopping my foot. I drive like grandpa bc I'm ultra conservative. (Energy wise). Got tired of my loud, shaking, rough idling 383 too.
I also like diesels.
Well, enough of my quirks.
As far as the VVT, I figured if they make .600 lift VVT cams, there should be a spring to hold in 10psi max on a stock .477? lift cam.
I'll look into some born warners. Seems a 76-78mm inducer and 75ish exducer is what I should look for? With a t4 housing?
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For what you're describing you'd be better off with a TVS blower.
Now as far as turbos go I've had 2 Borgs on my 6.0. First was a 75/83/1.0 T4. Power numbers come from numerous track runs and known raceweight. This turbo made around 850 rwhp completely maxed out. Next turbo was a 480/96/1.32 T6. Made around 950 rwhp before it snapped my driveshaft in half, and had more to go. This turbo is much lazier around town than the 475.
Because of the lazier spool and useless nature of 1000 hp where I drive, I just ordered my next turbo, 472/83/1.1 T6. I'm very curious to see how this one does spool wise. I know this is enough turbo to put a Silverado SS into the 10s which is a little heavier than mine.
Point to be made, when you're trying to maximize spool and midrange power with 600hp don't go slapping in an 850 hp turbo just because people on here think you need a 75 or 78mm turbo. The absolute beauty of the S400 turbos is that I can go all the way from a 64mm compressor up to a billet 88 with the same exact fitment.
Now as far as turbos go I've had 2 Borgs on my 6.0. First was a 75/83/1.0 T4. Power numbers come from numerous track runs and known raceweight. This turbo made around 850 rwhp completely maxed out. Next turbo was a 480/96/1.32 T6. Made around 950 rwhp before it snapped my driveshaft in half, and had more to go. This turbo is much lazier around town than the 475.
Because of the lazier spool and useless nature of 1000 hp where I drive, I just ordered my next turbo, 472/83/1.1 T6. I'm very curious to see how this one does spool wise. I know this is enough turbo to put a Silverado SS into the 10s which is a little heavier than mine.
Point to be made, when you're trying to maximize spool and midrange power with 600hp don't go slapping in an 850 hp turbo just because people on here think you need a 75 or 78mm turbo. The absolute beauty of the S400 turbos is that I can go all the way from a 64mm compressor up to a billet 88 with the same exact fitment.
Thread Starter
On The Tree
Joined: May 2008
Posts: 160
Likes: 7
From: Michigan
For what you're describing you'd be better off with a TVS blower.
Now as far as turbos go I've had 2 Borgs on my 6.0. First was a 75/83/1.0 T4. Power numbers come from numerous track runs and known raceweight. This turbo made around 850 rwhp completely maxed out. Next turbo was a 480/96/1.32 T6. Made around 950 rwhp before it snapped my driveshaft in half, and had more to go. This turbo is much lazier around town than the 475.
Because of the lazier spool and useless nature of 1000 hp where I drive, I just ordered my next turbo, 472/83/1.1 T6. I'm very curious to see how this one does spool wise. I know this is enough turbo to put a Silverado SS into the 10s which is a little heavier than mine.
Point to be made, when you're trying to maximize spool and midrange power with 600hp don't go slapping in an 850 hp turbo just because people on here think you need a 75 or 78mm turbo. The absolute beauty of the S400 turbos is that I can go all the way from a 64mm compressor up to a billet 88 with the same exact fitment.
Now as far as turbos go I've had 2 Borgs on my 6.0. First was a 75/83/1.0 T4. Power numbers come from numerous track runs and known raceweight. This turbo made around 850 rwhp completely maxed out. Next turbo was a 480/96/1.32 T6. Made around 950 rwhp before it snapped my driveshaft in half, and had more to go. This turbo is much lazier around town than the 475.
Because of the lazier spool and useless nature of 1000 hp where I drive, I just ordered my next turbo, 472/83/1.1 T6. I'm very curious to see how this one does spool wise. I know this is enough turbo to put a Silverado SS into the 10s which is a little heavier than mine.
Point to be made, when you're trying to maximize spool and midrange power with 600hp don't go slapping in an 850 hp turbo just because people on here think you need a 75 or 78mm turbo. The absolute beauty of the S400 turbos is that I can go all the way from a 64mm compressor up to a billet 88 with the same exact fitment.
So what BW size would you recommend if I wanted no more than 700fwhp?
You and me are kind of in the same ballpark here. My goal is 600 rwhp on straight 93. I've been running E85. I ended up going with the 72 mm which is a little oversized, but this turbo was only $699. A member on the truck side had a S468/5.3 combo which made 681 rwhp @ 19 psi. That's on a lifted truck with 35"+ tires.