View Poll Results: Single turbo or twin-turbo 383ci?
Single turbo
56
75.68%
twin-turbo
18
24.32%
Voters: 74. You may not vote on this poll
Please recommend turbo for 383ci, 800whp
05-05-2008, 03:20 PM
#41
LS1Tech Co-Founder
iTrader: (34)
I wasn't clear from your posts, are you going to be running a completely stock engine?
I have a GT 47-88 single with an 8:1 348ci, and it's a big laggy but made 867rwhp thru a TH400 on a Dynojet. And I am running an HKS wastegate, I think it was like $700.
I have a GT 47-88 single with an 8:1 348ci, and it's a big laggy but made 867rwhp thru a TH400 on a Dynojet. And I am running an HKS wastegate, I think it was like $700.
05-22-2008, 12:22 PM
#46
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I think you can easily get in the 700 range with a 78. I could be wrong though. You'll be pushing more PSI to get there, but it can be done. An 80 would definitely be more efficient at achieving that goal though (esp. with a larger cubed motor).
12-30-2008, 06:03 PM
#54
Im running a Precicion GT4276 with a 1.12 ar. I dont have a forged motor yet, but i could hit 800 hp with this turbo no problem.
Are you auto or 6 spd. That will make a pretty big diff.
If you know you will be happy with 800 a 78 is fine, or most 76's..
But i would go a lil bigger, work the turbo less, run less boost and make more power, also have room to grow.
Good luck, Chris
Are you auto or 6 spd. That will make a pretty big diff.
If you know you will be happy with 800 a 78 is fine, or most 76's..
But i would go a lil bigger, work the turbo less, run less boost and make more power, also have room to grow.
Good luck, Chris
05-13-2009, 07:52 AM
#56
An ls1 with forged rods and pistons should be ok for 800rwhp. Stock cranks are pretty strong and forged cranks of course are even stronger. Iron 6.0 blocks are stronger yet but I was targeting 1000rwhp as my max. Much past 1000rwhp would go to LSX block or other high end block if wanted alumuminum but you said 800rwhp goal.
You of course need tunign for this, hp tuners can do it and not sure if you can get real time tuning with 3bar and not sure 2 bar will do the job.It might depends on the turbo you choose and cam and head choices a bit . I think those patriots will be fine and decent cams are pretty reasonable. Too bad cam opinions vary so much but just pick one and try it.
You are also going to need a good fuel system like I run. Twin pumps intank, one works with hobbs switch and cuts in under boost, bigger lines, boost referenced reg and bigger rails. And for injectors 80 high impedence ,96 for low impedence.
Of course a serious twin disc clutch. Tranny might survive might need upgrading. Rear end for sure will need upgrading. Traction on street will be poor almost need to run et street radials or m and h street radials all the time track or street.
At that power level nittos and any normal street tire even ps2s are pretty much a joke.
Single is of course cheaper route. Easier to fit in the bay. Might keep accessories like air but you can fit twins in depending. You need good name brand gate ,be careful of knock offs. You might be able to run cheaper intercooler. Some guys seem to get ok results with cheaper intercooler or you can run alc/meth injection which you might have to depending on your available fuel.
Those master power turbos seem ok for the prices. I personally like garett about the best but different people like different ones.
Like everyone says doing this is not going to be cheap after you start adding stuff up.
At least you have a decent engine it sounds like already. But you are looking at like 10k in just fuel system, rear end,better t56 and thats like US dollars and you said its way more expensive to get stuff over there. LIkely at least another 3k or so into single turbo and 4k into twin with intercooler, piping, clamps,couplers,gate,blow off.oil lines. I have trouble finishing my car up on 50k a year and no house payment.
But we do have local guy with third gen in our local club. He has masterpower t 70, ebay manifolds ,not sure on intercooler or if he even has one yet.He is on stock rear end which is scary and is auto with not sure what auto trans maybe 700? with stall.
He has done low 11s at 126mph .He is running 5 tenths slower this season so far not sure why. And of course no where near 800rwhp yet looking mostly at his mph.
See how he does this year. But likely he will be killing his rear end ,his trans, his engine is forged.
You of course need tunign for this, hp tuners can do it and not sure if you can get real time tuning with 3bar and not sure 2 bar will do the job.It might depends on the turbo you choose and cam and head choices a bit . I think those patriots will be fine and decent cams are pretty reasonable. Too bad cam opinions vary so much but just pick one and try it.
You are also going to need a good fuel system like I run. Twin pumps intank, one works with hobbs switch and cuts in under boost, bigger lines, boost referenced reg and bigger rails. And for injectors 80 high impedence ,96 for low impedence.
Of course a serious twin disc clutch. Tranny might survive might need upgrading. Rear end for sure will need upgrading. Traction on street will be poor almost need to run et street radials or m and h street radials all the time track or street.
At that power level nittos and any normal street tire even ps2s are pretty much a joke.
Single is of course cheaper route. Easier to fit in the bay. Might keep accessories like air but you can fit twins in depending. You need good name brand gate ,be careful of knock offs. You might be able to run cheaper intercooler. Some guys seem to get ok results with cheaper intercooler or you can run alc/meth injection which you might have to depending on your available fuel.
Those master power turbos seem ok for the prices. I personally like garett about the best but different people like different ones.
Like everyone says doing this is not going to be cheap after you start adding stuff up.
At least you have a decent engine it sounds like already. But you are looking at like 10k in just fuel system, rear end,better t56 and thats like US dollars and you said its way more expensive to get stuff over there. LIkely at least another 3k or so into single turbo and 4k into twin with intercooler, piping, clamps,couplers,gate,blow off.oil lines. I have trouble finishing my car up on 50k a year and no house payment.
But we do have local guy with third gen in our local club. He has masterpower t 70, ebay manifolds ,not sure on intercooler or if he even has one yet.He is on stock rear end which is scary and is auto with not sure what auto trans maybe 700? with stall.
He has done low 11s at 126mph .He is running 5 tenths slower this season so far not sure why. And of course no where near 800rwhp yet looking mostly at his mph.
See how he does this year. But likely he will be killing his rear end ,his trans, his engine is forged.
05-13-2009, 09:20 AM
#57
Thanx for such reply, I wish more people gave advices like this 
Car already had 12-bolt and forged internals (according to seller), so I need to spend only on turbo system and fuelling. No I won't deal with clutches anymore... Sick and tired of them and trying to change gear at maximum rpms. I'll just try to find buyer for my T56 and then order 4L80E from US (or maybe I'll even try to find it here from some truck).
I already have TC78, cheap 4" IC, cheap wastegate. I'm just trying to design the whole system now - how to put downpipe bigger than 3", on which side, and how will I get fresh air to the filter
Car already had 12-bolt and forged internals (according to seller), so I need to spend only on turbo system and fuelling. No I won't deal with clutches anymore... Sick and tired of them and trying to change gear at maximum rpms. I'll just try to find buyer for my T56 and then order 4L80E from US (or maybe I'll even try to find it here from some truck).
I already have TC78, cheap 4" IC, cheap wastegate. I'm just trying to design the whole system now - how to put downpipe bigger than 3", on which side, and how will I get fresh air to the filter
05-13-2009, 10:05 AM
#60
Cheap and wastegate are not two words that should be in same sentence. Get brand name non knock off gate. A crap gate can easily cost you an engine. Genuine tial or turbosmart are too good brand name wastegates. You already have a 12 bolt great and even a stock 4l80 might be ok to 800rwhp but of course built one is better. I am going stage 5 flt 4l80e.
You will also need like a 1000 hp stall like yank py 3400e or equivalent.stock 4l80 stalll won't last long I dont think. Thats why this stuff keeps adding up.
You will also need like a 1000 hp stall like yank py 3400e or equivalent.stock 4l80 stalll won't last long I dont think. Thats why this stuff keeps adding up.