6.0L 370 or 408 for T91 turbo 850rwhp?
10-06-2005, 11:37 AM
#1
6.0L 370 or 408 for T91 turbo 850rwhp? I was planning on doing a big bore sleeved block for my turbo setup but my funds have been reduced so I am looking at the iron 6.0L block. I have a turbonetics BBT91 thumper and an air to water intercooler system and my goal is ~850rwhp. Please give me advice on this setup. My first intuition would be to go for the 408 for added displacement and possibly a quicker spool but the 370 would be able to rev higher which might peak out at a higher HP level. Would the higher rpm from the 370 make a big difference? This will be a street car and I don't mind the turbo spooling at 3000 or 3500 rpms to reach boost ~15lbs. I am looking into running an 02 Z06 cam and patriot stg 3 6.0L heads dual intank walbros and 72lb injectors. Any input is appreciated.
10-06-2005, 11:50 AM
#2
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Go 408 with a 91. That is a big unit and you will need the cubic inches to spool it indeed. Also it has a very large turbine wheel so backpressure will not be a concern at 850rwhp. At the point the turbo is barely breaking a sweat. Also think about going larger on the injectors, give yourself a little room to grow and for a safety margin.
BTW, a 91 reaching peak boost at 3000 rpms on a 408 is asking alot my friend.
Jose
BTW, a 91 reaching peak boost at 3000 rpms on a 408 is asking alot my friend.
Jose
10-06-2005, 11:52 AM
#3
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speedinc is making nearly 1,000rwhp on their STOCK CRANK 370 with a t-88 turbo. i would say if your funds are low... use a stock crank and go with a set up similar to theirs.
10-06-2005, 12:03 PM
#4
you will have to put more money into getting that motor to spin high enough then to buy a 4" crank.
definatly go with the bigger cubes on this motor, if your having it on th estreet will be better. otherwise it would take some work to get it to spin high enough, plus you would need a bigger stall which would make it unfriendly.
definatly go with the bigger cubes on this motor, if your having it on th estreet will be better. otherwise it would take some work to get it to spin high enough, plus you would need a bigger stall which would make it unfriendly.
10-06-2005, 12:13 PM
#7
That's what I'm leaning towards right now...370 I was thinking with a good set of rods/valvetrain I could rev it to 7200-7400 whereas the 408 I wouldn't put past 6800-6900 without worries and long term concerns. the AR is like 1.32 Also, I don't necessarily want gobs of torque due to limited traction on the street so I'm leaning towards the kick in the pants coming in ~4000 kind of like my hayabusa(100lbs torque/185hp). Also considering the delphi 96# but was trying to avoid having to get a low Z injector driver.
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10-06-2005, 01:07 PM
#11
Originally Posted by MIGHTYMOUSE
i got a good 6 liter iron block sitting at wheel 2 wheel that is waiting to become a 400" motor.. $350
you will DEF need it to make that turbo come on line.
you will DEF need it to make that turbo come on line.
10-06-2005, 01:11 PM
#12
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that much power will be worthless on the street. That turbo probably won't wake up till 5,000 rpm. Then when it does wake up it'll blow the tires off. Then the 400 hp car you're racing against will drive right by you.
Hope you got lots and lots of this ---> $$$$$ cause you're gonna have to beef up every drivetrain component and have all the suspension done.
Hope you got lots and lots of this ---> $$$$$ cause you're gonna have to beef up every drivetrain component and have all the suspension done.
10-06-2005, 02:02 PM
#13
I wouldn't say worthless but in 1st/2nd sure.. I have some 335s out back that help alot with traction. Going from stock wheels and tires to the 18x12w335s I used to be able to burn through 1, 2, and chirp 3rd. Now it has a hard time breaking loose even in first. Basically I have a t91 and a custom air to water intercooler setup already which I will be using. This will be a street car with a 6 speed and a high geared rearend 3.42 or less. So what AFFORDABLE engine setup would you recommend? Thanks
10-06-2005, 02:19 PM
#14
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I'm not going to address your tire selection.
Seems like folks on here keep on saying don't mess with a 91mm unless you are building a 8 second race car.
So I'd probably say get a mid frame 88mm and go from there.
Seems like folks on here keep on saying don't mess with a 91mm unless you are building a 8 second race car.
So I'd probably say get a mid frame 88mm and go from there.
. Thumper turbos rule. But a mid frame 88 would be better suited for the street.
10-06-2005, 03:03 PM
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Originally Posted by 93formto98T/A
Jose, assuming that I took your advice and went 408 when would you expect the turbo to "come online"? I don't want 5k maybe 3500-4000. But I am going for more of a top end kick then lots of torque down low.
408 stroker and a gt55 turbo(91 mm i believe)
i spoke with him a few days ago. He said boost was really starting to kick in between 3500-3800 rpm but didnt want to get into it as he was just starting to tune it...