It's like you know what I'm saying/thinking every morning I look in the mirror!!
Yellowchevy
Help me pick a turbo
- Thread starter shawn's diesel
- Start date
It's like you know what I'm saying/thinking every morning I look in the mirror!!
Yellowchevy
I've had every turbo set up besides a s300 single and triples.
Have had 72 Danville, 68 hybrid sticker, atock over s475, 475 single, and now have a S472 single. I like the s400 but I'll really am itching to go back to 475 under stock compounds. I don't like how clustered they are. But man they towed amazing and just RIPPED. Spooled stupid fast compared to my s400.
My S400 does run cooler though. And when the turbo lights it's a blast.
If I didn't have my mega cab to tow. My LBZ would have compounds on it. Even over a modified VVT etc.
Have had 72 Danville, 68 hybrid sticker, atock over s475, 475 single, and now have a S472 single. I like the s400 but I'll really am itching to go back to 475 under stock compounds. I don't like how clustered they are. But man they towed amazing and just RIPPED. Spooled stupid fast compared to my s400.
My S400 does run cooler though. And when the turbo lights it's a blast.
If I didn't have my mega cab to tow. My LBZ would have compounds on it. Even over a modified VVT etc.
I've often contemplated this 68vvt stocker over an s480. I bet that would be a nice setup.
Or buy one to have and just run the 480 for now. Then build another kit as you go and your bored with current setup. I mean we all know you get bored easily with your setups
turbine and exhaust housing would have to change from the 480 hes running now to make it work in a twin setup.
Anybody that's running a stock/s475 twin setup do anything to their stock charger when they twinned it? Anybody have issues with vanes or anything?
New bearings or seals? Replace the wheel with a batmo? New vanes? Cleaned the vanes? Or does everyone just pretty much throw the kit on and run it?
I've done a 100% stock IHI with 150k on it with a 475. Ran great. Then took it off, had it rebuilt, ported and polished and a batmowheel installed. Top end picked up but it seemed I lost a little spool up (seems the batmowheel doesn't like it). Then I put a s480 on and top end really picked up with no loss in spool up.
At some point soon, I want to swap the stock wheel back into the charger
Sent from my iPhone using Tapatalk
At some point soon, I want to swap the stock wheel back into the charger
Sent from my iPhone using Tapatalk
90-95% of people just install the kit on their untouched turbo.
If you modify the stock turbo it will complement the setup and spool quicker.
Yellowchevy
This is my stocker, I had it machined for the 68mm compressor out of my 4094 when I had my 4094 turned into a 72mm. Had the stock 68mm wheel sitting there so I said why not. I have never ran this 68mm stocker but I'd think twinned over an s480, it would be a nice stout little setup.
This is my stocker, I had it machined for the 68mm compressor out of my 4094 when I had my 4094 turned into a 72mm. Had the stock 68mm wheel sitting there so I said why not. I have never ran this 68mm stocker but I'd think twinned over an s480, it would be a nice stout little setup.
Looks nice and good work on the cover:thumb: I bet it would be a good one.
Did you keep the stock size turbine wheel or did you machine it out for larger one?
Yellowchevy
Turbo Comparison
Ok, maybe this will help shed some light on this matter for you guys. This dyno sheet is my truck with the same fueling/tuning and everything else except the turbo. I did this to have the infomation on hand when people ask me why I recommend what I do for my customers. With my stock injectors being the limiting factor I feel that the vgt's are still hard to beat for a daily driver because of the power under the curve. The S468's made more peak hp but sacrificed driveability. After the testing I found that the 83mm turbine is waste on a DMax so if you are going S400 route just go straight to the 87mm turbine wheel because it is more efficient across the board. The smallest compressor wheel I would use in a street truck is the 67/68mm because I used a 2.5 and it made a smidge less power and didn't spool up any faster or have any more power under the curve than the 68mm. Comparing the S468 to the BMW GT3794Va, the VGT is much better on the street with less smoke and much faster responce than the 468 and the little more topend hp from the 468 wasn't even noticeable but lack of motivation was. Comparing all these to my newest creation is even more of a win for the vgt because it is almost instant in it's response. I left the curser over the 2K rpm point to see the difference in hp/tq down low which is what gives you the driveability factor. This turbo didn't show the most topend power on the dyno but it runs circles around the others on the street. Truck gets rubber on the 4-5 shift with this turbo! The Gt3794 and S468-s made a peak of 42psi and the new vgt on my truck is making a solid 48psi boost. I will be doing Coker's spool/lag testing as soon as the roads get clear enough to do it. This will really show the big difference in spool up characteristics of this turbo. I honestly designed it to fix the LMM/LML turbo tuning issues and reduce power issue associated with these trucks and upgrade vgt turbos due to the fact that we don't have access to ALL the vgt turbo tables with EFILive. So far I think it is going to be the easy fix to the issue. I will have more info on that in the near future. I also attached the dyno sheet from the BMW GT3794Va on a truck that actually had enough fuel to run it to it's max power levels and it did 736hp 1298ftlbs at 42psi. That is far more than most stock motor guys really need so I don't see the point of going away from the vgt on a stock motor truck. All these turbo's tested and the 736hp on the lly had boost and egts in the same area so to say you going to drop a huge amount is not accurate info either. I'm mid 1500* on the 3794 on my 11.91 pass with it and the S468 did 1400* on same tune so it doesn't justify to me the expense of going that route. Like I said this is all stock injector/pump testing so obviously if you add fuel power will go up on all the above turbos. This was purely to see the driveability between the setups at stock fueling levels. It's good info for that, take it for what it is. It does show why I get soo many calls from guys that have s3-s4's and are pissed because they lost the lowend they came to love in their trucks. No offense to Mike Diesel, but it just show that your comment(My S480 spools as good or better than stock) is as inaccurate as it gets. You are winding it up in the rpms to get it to do anything and so the sound makes you think it is so much faster but it's not. Do Coker's test and see what it shows...
Ok, maybe this will help shed some light on this matter for you guys. This dyno sheet is my truck with the same fueling/tuning and everything else except the turbo. I did this to have the infomation on hand when people ask me why I recommend what I do for my customers. With my stock injectors being the limiting factor I feel that the vgt's are still hard to beat for a daily driver because of the power under the curve. The S468's made more peak hp but sacrificed driveability. After the testing I found that the 83mm turbine is waste on a DMax so if you are going S400 route just go straight to the 87mm turbine wheel because it is more efficient across the board. The smallest compressor wheel I would use in a street truck is the 67/68mm because I used a 2.5 and it made a smidge less power and didn't spool up any faster or have any more power under the curve than the 68mm. Comparing the S468 to the BMW GT3794Va, the VGT is much better on the street with less smoke and much faster responce than the 468 and the little more topend hp from the 468 wasn't even noticeable but lack of motivation was. Comparing all these to my newest creation is even more of a win for the vgt because it is almost instant in it's response. I left the curser over the 2K rpm point to see the difference in hp/tq down low which is what gives you the driveability factor. This turbo didn't show the most topend power on the dyno but it runs circles around the others on the street. Truck gets rubber on the 4-5 shift with this turbo! The Gt3794 and S468-s made a peak of 42psi and the new vgt on my truck is making a solid 48psi boost. I will be doing Coker's spool/lag testing as soon as the roads get clear enough to do it. This will really show the big difference in spool up characteristics of this turbo. I honestly designed it to fix the LMM/LML turbo tuning issues and reduce power issue associated with these trucks and upgrade vgt turbos due to the fact that we don't have access to ALL the vgt turbo tables with EFILive. So far I think it is going to be the easy fix to the issue. I will have more info on that in the near future. I also attached the dyno sheet from the BMW GT3794Va on a truck that actually had enough fuel to run it to it's max power levels and it did 736hp 1298ftlbs at 42psi. That is far more than most stock motor guys really need so I don't see the point of going away from the vgt on a stock motor truck. All these turbo's tested and the 736hp on the lly had boost and egts in the same area so to say you going to drop a huge amount is not accurate info either. I'm mid 1500* on the 3794 on my 11.91 pass with it and the S468 did 1400* on same tune so it doesn't justify to me the expense of going that route. Like I said this is all stock injector/pump testing so obviously if you add fuel power will go up on all the above turbos. This was purely to see the driveability between the setups at stock fueling levels. It's good info for that, take it for what it is. It does show why I get soo many calls from guys that have s3-s4's and are pissed because they lost the lowend they came to love in their trucks. No offense to Mike Diesel, but it just show that your comment(My S480 spools as good or better than stock) is as inaccurate as it gets. You are winding it up in the rpms to get it to do anything and so the sound makes you think it is so much faster but it's not. Do Coker's test and see what it shows...
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Ok, maybe this will help shed some light on this matter for you guys. This dyno sheet is my truck with the same fueling/tuning and everything else except the turbo. I did this to have the infomation on hand when people ask me why I recommend what I do for my customers. With my stock injectors being the limiting factor I feel that the vgt's are still hard to beat for a daily driver because of the power under the curve. The S468's made more peak hp but sacrificed driveability. After the testing I found that the 83mm turbine is waste on a DMax so if you are going S400 route just go straight to the 87mm turbine wheel because it is more efficient across the board. The smallest compressor wheel I would use in a street truck is the 67/68mm because I used a 2.5 and it made a smidge less power and didn't spool up any faster or have any more power under the curve than the 68mm. Comparing the S468 to the BMW GT3794Va, the VGT is much better on the street with less smoke and much faster responce than the 468 and the little more topend hp from the 468 wasn't even noticeable but lack of motivation was. Comparing all these to my newest creation is even more of a win for the vgt because it is almost instant in it's response. I left the curser over the 2K rpm point to see the difference in hp/tq down low which is what gives you the driveability factor. This turbo didn't show the most topend power on the dyno but it runs circles around the others on the street. Truck gets rubber on the 4-5 shift with this turbo! The Gt3794 and S468-s made a peak of 42psi and the new vgt on my truck is making a solid 48psi boost. I will be doing Coker's spool/lag testing as soon as the roads get clear enough to do it. This will really show the big difference in spool up characteristics of this turbo. I honestly designed it to fix the LMM/LML turbo tuning issues and reduce power issue associated with these trucks and upgrade vgt turbos due to the fact that we don't have access to ALL the vgt turbo tables with EFILive. So far I think it is going to be the easy fix to the issue. I will have more info on that in the near future. I also attached the dyno sheet from the BMW GT3794Va on a truck that actually had enough fuel to run it to it's max power levels and it did 736hp 1298ftlbs at 42psi. That is far more than most stock motor guys really need so I don't see the point of going away from the vgt on a stock motor truck. All these turbo's tested and the 736hp on the lly had boost and egts in the same area so to say you going to drop a huge amount is not accurate info either. I'm mid 1500* on the 3794 on my 11.91 pass with it and the S468 did 1400* on same tune so it doesn't justify to me the expense of going that route. Like I said this is all stock injector/pump testing so obviously if you add fuel power will go up on all the above turbos. This was purely to see the driveability between the setups at stock fueling levels. It's good info for that, take it for what it is. It does show why I get soo many calls from guys that have s3-s4's and are pissed because they lost the lowend they came to love in their trucks. No offense to Mike Diesel, but it just show that your comment(My S480 spools as good or better than stock) is as inaccurate as it gets. You are winding it up in the rpms to get it to do anything and so the sound makes you think it is so much faster but it's not. Do Coker's test and see what it shows...
Thank you for the write-up Mark...very helpful! For a non-VGT platform street truck (LB7), it looks like the s468 is the way to go...
I'm so close to pulling the trigger on a 68/87/.90....I only hesitate for fear of losing the amazing "lowend" I have with my gt4088r. As I mentioned to someone else recently, too bad it's not like test driving cars....once you upgrade, tough sh*t if you're unhappy with the results.
Mark, have you done testing with a s475 over a stocker in terms of spool up or do you think your bmw 3794 or new VGT will spool faster just not have as much top end pull?