Best twins for a LSX 427?
07-09-2012, 06:37 PM
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Best twins for a LSX 427? Think i decided to go twins due to size and need to know what pair will work best. The build is a forged LSX 427 fully ported ,4l80 trans,9" rear mostly street but some track time looking for 1000+ rwhp with quick spool time and maybe some room to grow! Any help would be appreciated plus i need to buy the turbos,wastegates,and bov's so vendors jump on!
07-09-2012, 06:46 PM
#2
precision 67's. With decent compression, heads, cam, and converter you can even go a little larger. We did a lsx 427, 10:1, prc ls7 heads, m6 corvette that spooled twin t4 76's pretty well.
07-09-2012, 06:55 PM
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Would you rather have very fast response or would you rather sacrifice some response for more power potential?
For a 1000rwhp 427, twin 35R's would be very fun and have almost no perceptible lag. That's how I prefer it, to get pushed back in the seat -as- you are rolling onto the throttle, not after.
6766's will make a good bit more power but aren't going to have the part throttle hit the 35's have.
For a 1000rwhp 427, twin 35R's would be very fun and have almost no perceptible lag. That's how I prefer it, to get pushed back in the seat -as- you are rolling onto the throttle, not after.
6766's will make a good bit more power but aren't going to have the part throttle hit the 35's have.
07-09-2012, 07:40 PM
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Would you rather have very fast response or would you rather sacrifice some response for more power potential?
For a 1000rwhp 427, twin 35R's would be very fun and have almost no perceptible lag. That's how I prefer it, to get pushed back in the seat -as- you are rolling onto the throttle, not after.
6766's will make a good bit more power but aren't going to have the part throttle hit the 35's have.
For a 1000rwhp 427, twin 35R's would be very fun and have almost no perceptible lag. That's how I prefer it, to get pushed back in the seat -as- you are rolling onto the throttle, not after.
6766's will make a good bit more power but aren't going to have the part throttle hit the 35's have.
I'd love to see some combinations running this turbo.
07-09-2012, 08:42 PM
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I would really like a happy med. but if i had to favor a side the quicker responce would win! I know a few guys starting to play with single 6466's on the turbo buicks with nice results!
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07-09-2012, 09:21 PM
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07-09-2012, 09:48 PM
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Would you rather have very fast response or would you rather sacrifice some response for more power potential?
For a 1000rwhp 427, twin 35R's would be very fun and have almost no perceptible lag. That's how I prefer it, to get pushed back in the seat -as- you are rolling onto the throttle, not after.
6766's will make a good bit more power but aren't going to have the part throttle hit the 35's have.
For a 1000rwhp 427, twin 35R's would be very fun and have almost no perceptible lag. That's how I prefer it, to get pushed back in the seat -as- you are rolling onto the throttle, not after.
6766's will make a good bit more power but aren't going to have the part throttle hit the 35's have.
07-09-2012, 10:17 PM
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Yea i have seen allot of bad press on precision lately so i may stay away from them. Running to small a turbo/s was a big concern due to back pressure and i dont want it to be so touchy from instant spool its not driveable on the street!
07-09-2012, 11:32 PM
#13
I raced a 3.0 liter supra that had a 6766 in it. In my 560rwhp NA camaro. And it had no lag. It came out harder than my car did. I wouldn't be worried about lag with two of them on 7 liters.
07-10-2012, 12:05 AM
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onfire how long did you run those turbos for ? and any effects on the motor or turbos ? sounds like a peppy setup , i know 35s are good for alot of power ,, and the .82 ar is not too small
07-10-2012, 10:09 AM
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You could run that set-up for years. I am bad to change combos so I never got close to the limit of those turbos...18psi and 4 bolt heads and never a problem.
07-10-2012, 10:57 AM
#16
We have several customers running similar setups. The Tnetics 6665's have been used quite a bit and also the GTX3582's. Both turbos make the HP you want no problem. Prices are quite a bit different though, but nonetheless both are great units. Both are very compact and offer tons of options for customizing to your setup.
07-10-2012, 02:05 PM
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X2. For a primarily street car, 427ci, stock weight, hard to beat the GT3582R, especially the new GTX....At 3900lbs and the Speed Inc kit with GT35's I could pop both bulbs on, hit the transbrake at 3000 rpm (could have footbraked it) and pop off a 1.35 sixty and 9.2 at 146mph at 18psi....more left in it back then.
On the other hand, I have 76s on my 427, and although laggier, the TH400 makes it managable.
07-10-2012, 05:46 PM
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Seems the recommend twins are 6665's or 6766's with a .81 AR and a few saying go 76's. Now i need to firgure out to do cast, billet, JB or BB?
