Twin Turbo 434 LSX Corvette
06-30-2009, 09:26 PM
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Twin Turbo 434 LSX Corvette Some of you all may have seen this thread a while back.
https://ls1tech.com/forums/forced-in...-lsx-pics.html
Well... We're finally getting close to being finished!
Dyno videos will come soon.
http://www.youtube.com/watch?v=jv2_APCqRas
http://www.youtube.com/watch?v=7ZQ2eH64-XU
https://ls1tech.com/forums/forced-in...-lsx-pics.html
Well... We're finally getting close to being finished!
Dyno videos will come soon.
http://www.youtube.com/watch?v=jv2_APCqRas
http://www.youtube.com/watch?v=7ZQ2eH64-XU
07-01-2009, 02:52 AM
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Cool! Didn't want to read through the whole thread and it looked like it got closed but what turbo's ended up being used? I heard there was some discussion of getting bigger ones?
07-01-2009, 07:35 AM
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Going with the Turbonectics GT-K 650's 66mm. Looking for a quick early spool around 3000RPM.
07-01-2009, 01:37 PM
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on a side note, that cam sounds good. care to share any generalizations about it??? 230's?, 240's?, 114?/115? just wondering how much cam it takes to make a 434 lope like that.
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07-01-2009, 07:40 PM
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very nice project and top notch work! although I would have gone with ALOT more turbo. quick early spool equals quick early choke on the top.
on a side note, that cam sounds good. care to share any generalizations about it??? 230's?, 240's?, 114?/115? just wondering how much cam it takes to make a 434 lope like that.
on a side note, that cam sounds good. care to share any generalizations about it??? 230's?, 240's?, 114?/115? just wondering how much cam it takes to make a 434 lope like that.
On another note this build is one top notch setup, cant wait to see the numbers it makes and the curve it has once everything is matched correctly to each other.
07-01-2009, 11:11 PM
#9
and as for too many here over turboing their street cars, that would be incorrect. most turbo compressor wheels are most efficient at about 60%-70% of their max flow. I crunch the air consumption numbers for the target power level of my street/strip builds and aim for the center island on the compressor map at 15psi to determine turbo size. for a 347 ci engine it worked out to be 61's. and for the 402 it worked out to be 74's. that may sound a little big by many people's standards, but I was NEVER down on power with big turbos. as a matter of fact, my next build will be very similar to the op's, but mine will wear tc78's.
still waiting to hear a little bit about that camshaft, Mr.427.
07-02-2009, 09:13 AM
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early spool is way overrated. why would you want a 402/408/427/434 to spool by 3000??? all that is going to do is blow the tires off. been there, done that, got the t-shirt. instead of taking power out to get the car moving, I would rather tune the powerband with turbo size. in my opinion, turbos are like camshafts. it's always a trade off between low end and upper rpm power. the only way to have both is a variable ar system.
and as for too many here over turboing their street cars, that would be incorrect. most turbo compressor wheels are most efficient at about 60%-70% of their max flow. I crunch the air consumption numbers for the target power level of my street/strip builds and aim for the center island on the compressor map at 15psi to determine turbo size. for a 347 ci engine it worked out to be 61's. and for the 402 it worked out to be 74's. that may sound a little big by many people's standards, but I was NEVER down on power with big turbos. as a matter of fact, my next build will be very similar to the op's, but mine will wear tc78's.
still waiting to hear a little bit about that camshaft, Mr.427.
and as for too many here over turboing their street cars, that would be incorrect. most turbo compressor wheels are most efficient at about 60%-70% of their max flow. I crunch the air consumption numbers for the target power level of my street/strip builds and aim for the center island on the compressor map at 15psi to determine turbo size. for a 347 ci engine it worked out to be 61's. and for the 402 it worked out to be 74's. that may sound a little big by many people's standards, but I was NEVER down on power with big turbos. as a matter of fact, my next build will be very similar to the op's, but mine will wear tc78's.
still waiting to hear a little bit about that camshaft, Mr.427.
Believe me we did a lot of discussion about turbo size. Yes they will run out of juice at around 6500 RPM. We will play with this for awhile but it is really no issue to move to 72's or 76's if we decide later. I don't drive around 6500 rpms routinely but I do around 3000 rpm. I have a installed a RPM Stage V 3:15 rear for that very reason. Don't worry with 14 inch tires out back....IT WILL HOOK!
07-02-2009, 12:35 PM
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07-02-2009, 01:46 PM
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07-04-2009, 11:25 AM
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I would like to point out this was a mild street tune in 92 degree weather on a mustang dyno at 18 pounds. This thing has a lot more in it!!!
I would also like to point out I was drunk and the camera adds 60 pounds!
I would also like to point out I was drunk and the camera adds 60 pounds!