S80 with OFI kit and 355 LT1
11-24-2006, 02:04 AM
#1
S80 with OFI kit and 355 LT1 Wondering what you guys think of the S80 turbo with a OFI Air to Water kit with 3.5" DP. I'm really considering this turbo over the 76GTS. I was told by Jose that the S80 will support 122lb/air per minute, which is huge ! I will initially be running this turbo on my stock shortblock ( at very low boost settings (5 to 7psi) using an E-Boost 2) while I build up a separate LT1 shortblock & heads. What do you think the S80 will be able to support when I have the built shortblock with 18 to 20 psi. Can anyone speculate on the pros and cons between the S80 VS. 76GTS ? I will using this setup about 80% on the street and 20% going to the dragstrip.
11-24-2006, 03:47 AM
#2
I would say if you are sticking with stock cubies, stick with the 76 as the 80 will take longer to spool. However the 76 will drop off earlier in the rpm than the 80 will so it really is based on more how you want to drive it. So my vote would be the 76 in your case.
Last edited by LS2Camaro; 11-24-2006 at 10:27 AM.
11-24-2006, 10:20 AM
#3
The 76or78 would work nicely.
I am using a 78 in Shawns truck. 98 C1500 5.7l vortec, stock bottom end. It comes into boost at about 3600rpms and makes over 5 by 4100. Before I did a lot of tuning in that area it would take about 4k to get it spining though.
Here is a vid of it leaving on 4psi at 4000rpm on the foot brake. He snuck up on it really slow in the video. It would get there really quick on the t-brake though.
http://videos.streetfire.net/search/...7f00f8386f.htm
I am using a 78 in Shawns truck. 98 C1500 5.7l vortec, stock bottom end. It comes into boost at about 3600rpms and makes over 5 by 4100. Before I did a lot of tuning in that area it would take about 4k to get it spining though.
Here is a vid of it leaving on 4psi at 4000rpm on the foot brake. He snuck up on it really slow in the video. It would get there really quick on the t-brake though.
http://videos.streetfire.net/search/...7f00f8386f.htm
11-24-2006, 01:46 PM
#5
(Hellbents S10)
Wow, nice video of the black truck bringing up the boost for launch.
My car is a 6 spd, so it will be hard to bring the boost up at the line like an automatic. That is one of my concerns with launching the car. I'm wondering where the balancing point of having too much or not enough turbo to have a good balance for street and strip. I would like to have a 355 CI that I can turn to about 6500 rpm's with 18 to 20 psi on (high boost, race gas) assuming 20 psi will not be attainable on 93 pump gas. Does anyone know what the limits of 93 pump gas would be in comparison to maximum boost you should run. 13 or 14psi would be my guess at the max you should run on pump gas (93 octane). I'm wondering if the 76 GTS will fall off to soon for the 6500 rpm range or if I will need to go with the S80 to accomplish the upper end of my rpm. I would really like to have my full spool between 3500 and 4000 rpm. Do you guys think this is reasonable to accomplish ?
Wow, nice video of the black truck bringing up the boost for launch.
My car is a 6 spd, so it will be hard to bring the boost up at the line like an automatic. That is one of my concerns with launching the car. I'm wondering where the balancing point of having too much or not enough turbo to have a good balance for street and strip. I would like to have a 355 CI that I can turn to about 6500 rpm's with 18 to 20 psi on (high boost, race gas) assuming 20 psi will not be attainable on 93 pump gas. Does anyone know what the limits of 93 pump gas would be in comparison to maximum boost you should run. 13 or 14psi would be my guess at the max you should run on pump gas (93 octane). I'm wondering if the 76 GTS will fall off to soon for the 6500 rpm range or if I will need to go with the S80 to accomplish the upper end of my rpm. I would really like to have my full spool between 3500 and 4000 rpm. Do you guys think this is reasonable to accomplish ?
11-27-2006, 09:09 AM
#6
Originally Posted by 96silverram
I would really like to have my full spool between 3500 and 4000 rpm. Do you guys think this is reasonable to accomplish ?
The 76GTS can support up to ~950rwhp on the right setup... how much you looking for?
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11-27-2006, 10:33 AM
#9
On a 346ci, these are approx. numbers since all setups are different.... This is based on 8.5cr, and 270cfm heads with a LS6 cam. 6spd trans as well.
S76 - ~3900
S78 - ~3950
S80 - ~4000
S82 - ~4100
S85 - ~4300
S88 - ~4400
The S80 is by far the best all around for big power and good spool up.
S76 - ~3900
S78 - ~3950
S80 - ~4000
S82 - ~4100
S85 - ~4300
S88 - ~4400
The S80 is by far the best all around for big power and good spool up.
11-27-2006, 02:22 PM
#10
Dr. Turbo,
Thanks for the chart as a basic reference. I agree that the S80 is a good middle ground for a T6. I willing to have the bottom end be a little soggy on my 355 CI so it does not hit so hard in the low rpms on the street. I'm probably going to do a set of LE3 heads designed around doing a Turbo. Should flow in the 270 to 280 ish with a LE3 head. Not sure on cam selection right now, but I will figure it out in the near future. 4000 rpm's is probably the max I wanna go with waiting for the turbo to spool and still have a pretty good hit, I'm thinking I might even spray it with a 50 or 75 shot at 3000 rpm's just to wake it up a little bit sooner.
My initial goals will be to get in the 700 rwhp range and then after I have the setup figured out I will probably start to push on it for much more
Thanks for the chart as a basic reference. I agree that the S80 is a good middle ground for a T6. I willing to have the bottom end be a little soggy on my 355 CI so it does not hit so hard in the low rpms on the street. I'm probably going to do a set of LE3 heads designed around doing a Turbo. Should flow in the 270 to 280 ish with a LE3 head. Not sure on cam selection right now, but I will figure it out in the near future. 4000 rpm's is probably the max I wanna go with waiting for the turbo to spool and still have a pretty good hit, I'm thinking I might even spray it with a 50 or 75 shot at 3000 rpm's just to wake it up a little bit sooner.
My initial goals will be to get in the 700 rwhp range and then after I have the setup figured out I will probably start to push on it for much more