looking to replace my gt3582s
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From: Florida
looking to replace my gt3582s combo is manual trans, 5.3 flat tops 799 heads, elgin 1838 right now (216/220 560/560) but i ordered a ss2 elgin 1840 last night to try too.
I have the $200 journal version of these: https://www.ebay.com/itm/GT35R-GT358...AAAOSwoydWoeVc
Id like to find something that will spin up faster but still make good power, so im looking at spending a bit more money this time around. basically the video richard holdener just put out comparing twins to single is exactly how mine is.
the two options im looking at are the VSR next gen 6262 and 5855. has anyone seen either of these combos around? i am leaning toward the 5855 but its a pretty big cost to go in blind.
any thoughts or info is appreciated
I have the $200 journal version of these: https://www.ebay.com/itm/GT35R-GT358...AAAOSwoydWoeVc
Id like to find something that will spin up faster but still make good power, so im looking at spending a bit more money this time around. basically the video richard holdener just put out comparing twins to single is exactly how mine is.
the two options im looking at are the VSR next gen 6262 and 5855. has anyone seen either of these combos around? i am leaning toward the 5855 but its a pretty big cost to go in blind.
any thoughts or info is appreciated
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From: Florida
800-1000hp capable, ok spinning up into 7k range
id like something that is as responsive as possible, with all the newest turbo designs coming out, im interested in taking better advantage of that over the bottom dollar hardware ive been playing with lately.
id like something that is as responsive as possible, with all the newest turbo designs coming out, im interested in taking better advantage of that over the bottom dollar hardware ive been playing with lately.
I would go with the BB 58/55's. If you think of the 5.3 as two 2.65 liter motors, a common upgrade in the 2.5L Subaru world is a 52/55 and they rate it at around 400hp. Should be responsive and still hit the power range you want.
A .63 GT35 should be pretty responsive on a flat top 5.3. What heads and intake? IC? hot side setup? If it's not I wouldn't blame the turbos. Sure the Borgs will pull the same weight... (or even more) and be a tad more responsive IMO. But I'd look at other things first. Did you run car in the 1/4? was talking to a guy on youtube that trapped 143 at 3100lbs earlier today with the cast GT3582's on a 4.8.
Richard has .82's on a 4.8. .63's on a healthy 5.3 should be like a light switch. Dumping a bunch of cash into the turbos for what will likely amount to 100ish rpm better spool up can't be the best way to go about it. I'd figure out if/why the motors not happy NA first. I also think the borgs and the .68 GT3582s woudl fall short of 1000whp. SO you'd likely end up with a larger more laggy turbo to hit that goal.
A 10:1 NA 5.3 with a good cam and intake should be pretty healthy. Have you checked your cranking compression? You are running cams with a big intake duration on a relatively small motor. That generally means they won't make much power till after 4k. Might try advancing the SS2 if you are dead set on running it. I'd try Try 3-4*.
Have you considered a short duration high lift, tight LSA cam? Little late now it sounds like, but I'd think something like a STG2 high lift truck cam from TSP would make another 60hp at 3k and help spool those turbos down low. You can also get them to grind it on a tighter 111 LSA. (I'd even ask for a 110).
Something sounds kind of fishy to me is all. Have you tried sealing off your WG's and BOV? Maybe put the top boost ref line on teh WG's only? Just to see if response improves?
Richard has .82's on a 4.8. .63's on a healthy 5.3 should be like a light switch. Dumping a bunch of cash into the turbos for what will likely amount to 100ish rpm better spool up can't be the best way to go about it. I'd figure out if/why the motors not happy NA first. I also think the borgs and the .68 GT3582s woudl fall short of 1000whp. SO you'd likely end up with a larger more laggy turbo to hit that goal.
A 10:1 NA 5.3 with a good cam and intake should be pretty healthy. Have you checked your cranking compression? You are running cams with a big intake duration on a relatively small motor. That generally means they won't make much power till after 4k. Might try advancing the SS2 if you are dead set on running it. I'd try Try 3-4*.
Have you considered a short duration high lift, tight LSA cam? Little late now it sounds like, but I'd think something like a STG2 high lift truck cam from TSP would make another 60hp at 3k and help spool those turbos down low. You can also get them to grind it on a tighter 111 LSA. (I'd even ask for a 110).
Something sounds kind of fishy to me is all. Have you tried sealing off your WG's and BOV? Maybe put the top boost ref line on teh WG's only? Just to see if response improves?
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From: Florida
lots of good ideas, i initially was chasing that sort of stuff but ive seen a couple other guys on here with similar spool times as mine.
ill work on getting answers to your questions over the next few days. I had 15# springs in my gates a little while back and when i removed them it didnt seem a whole lot different on spool up. i just got a mac 4 port to try out which i think will be able to hold the gate shut better, im using the holley 2 port style and right now it doesnt apply dome pressure very fast and there isnt a way (that i have found) to force the + solenoid open below a set point.
ill work on getting answers to your questions over the next few days. I had 15# springs in my gates a little while back and when i removed them it didnt seem a whole lot different on spool up. i just got a mac 4 port to try out which i think will be able to hold the gate shut better, im using the holley 2 port style and right now it doesnt apply dome pressure very fast and there isnt a way (that i have found) to force the + solenoid open below a set point.
Before playing with control methods. I'd block the buggers off and make sure they are sealing 100%. Same with the BOV. That way you know without a doubt that's the best it's gonna be "spool wise". If there's no real change in initial spool, no reason to spend excess time playing with boost control.
Might start with a compression check. My first alum 5.3 was down on power from previous gen3 dished piston setup. And I ran 317's on that motor. So like 8.6:1 or something stupid. Eventually figured out my crank keyway was actually 8-9* retarded on the engine (which is odd since i've worked on several alum 5.3's since and had no issue). When I degreed the cam (212/212@112 .565) it actually ended up 1.5* or so advanced. it was a whole new engine. Spit out 200psi cranking compression (was in the 140's.) and picked up 12mph in the 1/4 at the same boost level. (trapped 159) If your not spitting out 170+ on a a mild cam 10:1 5.3, somethings off IMO. Also should have a raspy exh note and snappy throttle response. Mine sounded completely different once I had the cam advanced and happy. I haven't seen another engine retarded like mine, but I've played with a bunch. Seen several with low cranking compression. Wish I knew what a SS2 spit out on a healthy 5.3. Might advance that cam a good 4-5*
Might start with a compression check. My first alum 5.3 was down on power from previous gen3 dished piston setup. And I ran 317's on that motor. So like 8.6:1 or something stupid. Eventually figured out my crank keyway was actually 8-9* retarded on the engine (which is odd since i've worked on several alum 5.3's since and had no issue). When I degreed the cam (212/212@112 .565) it actually ended up 1.5* or so advanced. it was a whole new engine. Spit out 200psi cranking compression (was in the 140's.) and picked up 12mph in the 1/4 at the same boost level. (trapped 159) If your not spitting out 170+ on a a mild cam 10:1 5.3, somethings off IMO. Also should have a raspy exh note and snappy throttle response. Mine sounded completely different once I had the cam advanced and happy. I haven't seen another engine retarded like mine, but I've played with a bunch. Seen several with low cranking compression. Wish I knew what a SS2 spit out on a healthy 5.3. Might advance that cam a good 4-5*
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From: Florida
you guys gave me a lot of homework to do.
the tune should be pretty close, but ive been fighting datalogs since i put this stupid thing together. i have just finally got it working reliably so ill post up some screenshots soon.
I am confident most of these things ive addressed, however its all been spread out across the last few months with weeks of not touching the car, id rather go through it all again now to make sure its all right.
the tune should be pretty close, but ive been fighting datalogs since i put this stupid thing together. i have just finally got it working reliably so ill post up some screenshots soon.
I am confident most of these things ive addressed, however its all been spread out across the last few months with weeks of not touching the car, id rather go through it all again now to make sure its all right.
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From: Norn Iron
combo is manual trans, 5.3 flat tops 799 heads, elgin 1838 right now (216/220 560/560) but i ordered a ss2 elgin 1840 last night to try too.
I have the $200 journal version of these: https://www.ebay.com/itm/GT35R-GT358...AAAOSwoydWoeVc
Id like to find something that will spin up faster but still make good power, so im looking at spending a bit more money this time around. basically the video richard holdener just put out comparing twins to single is exactly how mine is.
the two options im looking at are the VSR next gen 6262 and 5855. has anyone seen either of these combos around? i am leaning toward the 5855 but its a pretty big cost to go in blind.
any thoughts or info is appreciated
I have the $200 journal version of these: https://www.ebay.com/itm/GT35R-GT358...AAAOSwoydWoeVc
Id like to find something that will spin up faster but still make good power, so im looking at spending a bit more money this time around. basically the video richard holdener just put out comparing twins to single is exactly how mine is.
the two options im looking at are the VSR next gen 6262 and 5855. has anyone seen either of these combos around? i am leaning toward the 5855 but its a pretty big cost to go in blind.
any thoughts or info is appreciated
Are you using the same 0.63 housing ?
Why not try a pair of smaller turbine housings on what you have ? A BB turbo should help a little, but ultimately if they're still using heavy ***** wheels as the chinese units seem to, spool will be slower than something of quality with lighter wheels.
6262 might still be a little large...although sometimes larger units that flow more out the turbine, spool faster than smaller units.
What transmission ?
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according to the invoice when i bought them they are the 0.63 turbine housings.when i put this combo together the goal was to favor response over power.
i dont really care about the bb aspect, but i like that 5855 because it supposedly has the newer lighter wheels in it.
currently transmission is an AR5. I have a new 3.27 first tkx on order.
the car is a full weight 1973 chevelle wagon with a 2.73 rear gear so i know thats not helping, but thats why i selected the 63 turbines.
i am exceptionally busy throughout the week but plan to really attack the wagon over the weekend and make sure everything brought up in this thread isnt contributing to my problems. most things i am confident are correct but a few things i havent checked and it doesnt hurt to double check everything.
i dont really care about the bb aspect, but i like that 5855 because it supposedly has the newer lighter wheels in it.
currently transmission is an AR5. I have a new 3.27 first tkx on order.
the car is a full weight 1973 chevelle wagon with a 2.73 rear gear so i know thats not helping, but thats why i selected the 63 turbines.
i am exceptionally busy throughout the week but plan to really attack the wagon over the weekend and make sure everything brought up in this thread isnt contributing to my problems. most things i am confident are correct but a few things i havent checked and it doesnt hurt to double check everything.
I'd be real curious to see the weight of the wheels compared. I can't imagine the GT35's little cast 61mm wheel is that heavy. Maybe old tech. in the blade shape/profiles... But they are generally considered a "snappy" undersized turbo for an LS. I feel like mine are anyway. And they are the bigger overdriven 64mm wheels on a 241 headed 5.3. Car's probably making 320 crank if I'm lucky NA. I also drove a manual LS1 with a mild cam and gt35's and it was VERY responsive. Too much so IMO, if that's a thing...
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From: Florida
thats what i was expecting. hopefully its just some stupid mistake i made.
i know during working through some issues with the holley i had the wastegates hooked up wrong or unplugged and much stiffer springs and things like that and the spool characteristics never really changed, it just went way too high or low depending on what i was messing with
when the boost comes on the car feels very strong, but sometimes at cruise it feels like it has a slight miss. ive replaced the camshaft and spark plugs and it still does it. i havent actively tried to figure that out since its very minor and ive had bigger issues to focus on. i dont think the timing is that conservative either, im usually a bit aggressive in that department.
i know during working through some issues with the holley i had the wastegates hooked up wrong or unplugged and much stiffer springs and things like that and the spool characteristics never really changed, it just went way too high or low depending on what i was messing with
when the boost comes on the car feels very strong, but sometimes at cruise it feels like it has a slight miss. ive replaced the camshaft and spark plugs and it still does it. i havent actively tried to figure that out since its very minor and ive had bigger issues to focus on. i dont think the timing is that conservative either, im usually a bit aggressive in that department.