Twin 76's
Thread Starter
Safety Car
Joined: Jan 2004
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From: Making my plane take off from a treadmill
Twin 76's
Anyone running twin 76's on the HP twin kit or any other similar setup with a 408?
I'm trying to get an idea of where spool might be at.
how would twin 67/70's spool on a 408 this being with .96 t4 housings....
I'm trying to get an idea of where spool might be at.
how would twin 67/70's spool on a 408 this being with .96 t4 housings....
Melting Slicks
Joined: Sep 2004
Posts: 3,153
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also speack to Nick Yoskin. hes got the PTK/S kit and is running T66's. also do a search for PTS and speack to Arnel (sorry cant remeber his username on here). he is running a 408 with bigger turbos.
thanks Chris.
Burning Brakes
Joined: Mar 2002
Posts: 1,040
Likes: 1
From: Knoxville TN
I had twin non bb turbonetics t76's from forced inductions with mps exhaust wheels and .68 ar's on my 402. boost started at ~ 3200 and full boost(15psi) was in by ~ 4200. this was with a 246/240-614/588-114 cam.
Le Mans Master
Joined: Oct 2003
Posts: 8,863
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From: PA
St. Jude Donor '08
HELLO,
i run 347 w/turbonetic's 66mm ceramic bearing and the housing is .68
definately an aggressive turbo for 347 but surprisinly it spools almost as quick as my old te44 from a dig. now from any kinda roll the spool delay isnt there, load. as far as power compaired to the te44 it isnt close.
arnel runs same turbos on his 408 but his housings i believe ar .81
he too will tell you that spool isnt an issue. screen name is AVB
OH BTW I TOO BOUGHT MY TURBOS FROM JOSE @ FORCED INDUCTIONS ALONG SR71 AND AVB ......
i run 347 w/turbonetic's 66mm ceramic bearing and the housing is .68
definately an aggressive turbo for 347 but surprisinly it spools almost as quick as my old te44 from a dig. now from any kinda roll the spool delay isnt there, load. as far as power compaired to the te44 it isnt close.
arnel runs same turbos on his 408 but his housings i believe ar .81
he too will tell you that spool isnt an issue. screen name is AVB
OH BTW I TOO BOUGHT MY TURBOS FROM JOSE @ FORCED INDUCTIONS ALONG SR71 AND AVB ......
Burning Brakes
Joined: May 2003
Posts: 1,058
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From: Roswell New Mexico
St. Jude Donor '07-'08
I have twin 67MM turbos with that kit, and the dyno graph posted here on the forum in FI, just do a search.
As far as 76mm... corvette4ever has that set up with a 427. He has run at 6psi and 11psi and can answer those questions for you.
As far as 76mm... corvette4ever has that set up with a 427. He has run at 6psi and 11psi and can answer those questions for you.
Safety Car
Joined: Apr 2004
Posts: 3,932
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From: Hayward California
408, Twin 66's w/ .81's here and like Nick said above, boost lag is not an issue at all and is IMO ideal. I haven't put it on a dyno since moving to the 66's so I couldn't tell you specific rpm info. just yet.
IMO, the 67's on a 408 is a nicer match
Arnel
IMO, the 67's on a 408 is a nicer match
Arnel
Drifting
Joined: Apr 2001
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From: Menifee California
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Drifting
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From: Dubai, UAE
Thread Starter
Safety Car
Joined: Jan 2004
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From: Making my plane take off from a treadmill
Burning Brakes
Joined: Mar 2002
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From: Knoxville TN
66's are small on a 408. sure they spool quick, but they run out of breath quick too. if you are wanting to make ~ 1000hp, they are out of their best effiency range. staying close to max effiency is the reason some(like me) made BIG power with less boost. how many others here ran 5.5x @ 128 mph in the 1/8th on only 15psi??? sure paul z ran 5.48 @ 125 mph with a 347 and 67's. but that was with what??? 22-24psi and a mega $$$ set-up??? if you want to make big power, you can't be afraid to run big turbos. if you can be satisfied with mediocre power, stick with undersized, instant spooling turbos. while they may feel fast, they will ultimately be slower than a properly sized turbo.
Safety Car
Joined: Apr 2004
Posts: 3,932
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From: Hayward California
66's are small on a 408. sure they spool quick, but they run out of breath quick too. if you are wanting to make ~ 1000hp, they are out of their best effiency range. staying close to max effiency is the reason some(like me) made BIG power with less boost. how many others here ran 5.5x @ 128 mph in the 1/8th on only 15psi??? sure paul z ran 5.48 @ 125 mph with a 347 and 67's. but that was with what??? 22-24psi and a mega $$$ set-up??? if you want to make big power, you can't be afraid to run big turbos. if you can be satisfied with mediocre power, stick with undersized, instant spooling turbos. while they may feel fast, they will ultimately be slower than a properly sized turbo.
If I seriously weren't horsing around and wanted to compete at the dragstrip, had what it took to put it down and keep it together (goal being max effort), I totally agree... 66's are small and wouldn't even be considered.
Otherwise, as some are doing here, when going to the track the boost is run at the lower setting and that's just to keep traction in check.
Drifting
Joined: Jan 2002
Posts: 1,731
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From: Bay Area CA
Twin 76s probably wouldn't reach full boost before 4500 rpm maybe closer to 5000 with such a large AR. Depending on what you are trying to do, that's probably way too much turbo for you. They will make 1800bhp.
Le Mans Master
Joined: Oct 2003
Posts: 8,863
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From: PA
St. Jude Donor '08
66's are small on a 408. sure they spool quick, but they run out of breath quick too. if you are wanting to make ~ 1000hp, they are out of their best effiency range. staying close to max effiency is the reason some(like me) made BIG power with less boost. how many others here ran 5.5x @ 128 mph in the 1/8th on only 15psi??? sure paul z ran 5.48 @ 125 mph with a 347 and 67's. but that was with what??? 22-24psi and a mega $$$ set-up??? if you want to make big power, you can't be afraid to run big turbos. if you can be satisfied with mediocre power, stick with undersized, instant spooling turbos. while they may feel fast, they will ultimately be slower than a properly sized turbo.
when i bought them i was worried that they
were going to be to much of a step up from my punnie 57mm te44.
that certainly wasnt the case, these bitches are insane! but did i leave power on the table?
paul z motor wasnt anything special at all.
Safety Car
Joined: Apr 2004
Posts: 3,932
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From: Hayward California
so tom ur saying that my 66mm ar.68 are to small for my 347?
when i bought them i was worried that they
were going to be to much of a step up from my punnie 57mm te44.
that certainly wasnt the case, these bitches are insane! but did i leave power on the table?
paul z motor wasnt anything special at all.
when i bought them i was worried that they
were going to be to much of a step up from my punnie 57mm te44.
that certainly wasnt the case, these bitches are insane! but did i leave power on the table?
paul z motor wasnt anything special at all.
Arnel
Le Mans Master
Joined: Oct 2003
Posts: 8,863
Likes: 86
From: PA
St. Jude Donor '08
not sure thats what he meant arnel, he was referring to paul's z car...
to small the 67mm....
sure paul z ran 5.48 @ 125 mph with a 347 and 67's. but that was with what??? 22-24psi and a mega $$$ set-up???
Burning Brakes
Joined: Mar 2002
Posts: 1,040
Likes: 1
From: Knoxville TN
so tom ur saying that my 66mm ar.68 are to small for my 347?
when i bought them i was worried that they
were going to be to much of a step up from my punnie 57mm te44.
that certainly wasnt the case, these bitches are insane! but did i leave power on the table?
paul z motor wasnt anything special at all.
when i bought them i was worried that they
were going to be to much of a step up from my punnie 57mm te44.
that certainly wasnt the case, these bitches are insane! but did i leave power on the table?
paul z motor wasnt anything special at all.
and there wasn't anything in paul z's car that wasn't special.
Le Mans Master
Joined: Oct 2003
Posts: 8,863
Likes: 86
From: PA
St. Jude Donor '08
yeah tom they feel ALOT stronger then old te44, 57mm. thats why i was a little dissapionted when i went to the track w/66 and it didnt mph much faster. lessoned learned extra power doesnt always equate to lower et or more mph. reason big wheel spin
i not sure about that...engine wise, LS6 head certainly dont fall into the catergory of "special"
