anything to be gaied with bigger turbine?
10-24-2018, 07:43 PM
#1
anything to be gaied with bigger turbine? hi guys I have been running my nova with the same setup for 5 years now. it is a 6.0 with a small cam (206/212) @ .050 ,glide, 3.42 gear and I run a s480 /83 /1.25 t4 turbo with a race cover. performance wise I don't really want to go a hell of a lot faster. I have been 1.43 60 ' 6.08 @ 115.57 1/8 and 9.50 @143 with it at 20 psi boost. the car is 3510 lbs with me in it. I don't see me going more than 1/2 second faster and I think my turbo will get me there but is there anything to be gained with a bigger turbine if max power is not an issue?
10-25-2018, 09:22 AM
#2
I would think a 6.0 would wake up a LOT with just a bigger cam. I would not imagine you NEED the 96mm turbine, but it or the 92mm would for sure make power. Especially at 20-25psi....
10-26-2018, 03:31 PM
#5
Any preturbine back pressure measurements? What rpm does power roll off?
Turbine and cam to go 7500 should get you there.
Turbine and cam to go 7500 should get you there.
10-26-2018, 03:41 PM
#6
9 Second Club
Turbine housings are cheap....try it.
Pressure readings dont always tell much with regards to this, but with my very limited testing...I've rarely seen a downside to a bigger turbine ( I guess unless you were already running a huge one )
Pressure readings dont always tell much with regards to this, but with my very limited testing...I've rarely seen a downside to a bigger turbine ( I guess unless you were already running a huge one )
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10-26-2018, 04:09 PM
#8
9 Second Club
Ahh right. Yep...ignoring the work, a cam change might make more sense vs a turbo change.
That said, he could sell the turbo to recoup costs, or maybe just have a bigger turbine wheel fitted to his own ?
Either way, that is a baby cam. Bound to be lots of potential for gains there.
10-26-2018, 06:47 PM
#9
Launching!
I just changed from an s480 83/75 to a s480 96/88 and it made a huge improvement in my car... my cam wasn’t optimal and that along with the small turbine side was causing back pressure issues.... you could see it specifically in the fuel logs where there was a huge dip on fuel after 6500.... I think it was just choking and couldn’t get all the exhaust out.... switched to the cast s480 and power carries past 7k clean.... no difference in spool up and still makes almost 8 lb on 2 step.... I’m running gold box and according to my ve table it took over 20% more fuel in various rpm ranges....
10-26-2018, 07:48 PM
#11
Restricted User
1.25 A/R T4 is roughly equal to a 1.10 A/R T6 with the same wheel.
Your wheel is likely holding you back more than the housing.
Personally, I'd swap cam first. Even with a larger housing, you're not likely to pick up anything noticeable.
Your wheel is likely holding you back more than the housing.
Personally, I'd swap cam first. Even with a larger housing, you're not likely to pick up anything noticeable.
10-26-2018, 08:25 PM
#12
My buddy has a very similar combo to yours (6.0, truck intake, 1.80 glide, 3.31 gear, 275 radial) at about 3500 lbs. He runs a JFR 218 cam and an s478/92 t4 turbo with 4” exhaust to the axle. He just ran 10.30 @ 135 at 8 psi leaving on low boost. So a cam change could help but linked with the turbo I think would be awesome.
10-27-2018, 06:47 PM
#14
My buddy has a very similar combo to yours (6.0, truck intake, 1.80 glide, 3.31 gear, 275 radial) at about 3500 lbs. He runs a JFR 218 cam and an s478/92 t4 turbo with 4” exhaust to the axle. He just ran 10.30 @ 135 at 8 psi leaving on low boost. So a cam change could help but linked with the turbo I think would be awesome.
10-28-2018, 08:56 AM
#16
Launching!
Was hoping guard dog/ sweet pea nova would chime in on this.... spoke with him briefly at ls fest and said when he switched from the 96 turbine to a 100 mm turbine he had some serious gains with no other changes in the tune
10-28-2018, 05:05 PM
#18
the cam is small . and im sure there is power in it but it really shines down low. idles like a stocker. and gives the car a sleeper sound. and out of the 10 or so turbo ls cars around it really does not fall very short on performance. I have built and tuned a couple different turbo cars most with ljms stage 2 cams and a jarrett 218 . they are stronger upstairs. but boost being the same im not giving up more than a tenth or two from what ive seen . and they all run the 92mm turbine . if I had that turbine I bet I can run pretty close. if I get a chance I will try a bigger turbine turbo and see. but I still think I can go 9 teens or 20s at 20-22 psi with this small cam and turbo.
im just wondering if im giving up power in the rpm I run it in? and how much. anyone ever to a back to back 83 to 96 mm turbine swap?
im just wondering if im giving up power in the rpm I run it in? and how much. anyone ever to a back to back 83 to 96 mm turbine swap?
10-28-2018, 05:16 PM
#19
I did a gt45 80mm 1.10 t4 to s480 96mm 1.25 t4 turbine and it was plain a simply i amazing the change of how the car worked. Your 83mm turbine has an exducer of 75mm so the comparison should hold ok. I didnt lose a bit of spool and the top end picked up so much i had to move to larger injectors. I will never go to small on the turbine again. Lesson learned for sure.