Turbo silverado
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From: Louisiana
I havent found many people around here that have been very helpful. Hes about the only one that I've found that I can take my truck too and he will tune it and put parts on it if I'm being to lazy to mess with. Also The FIC website calculator says the 850cc on e85 with a turbo is good for 734 on the tire and the 1000cc are good for 863 on the tire.
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From: Louisiana
man I just bought those injectors from huron speed a few days ago, maybe they will let me trade them in for something different because I haven't even opened them. And I had walbro pumps before the 340 and they went out on me way to fast so that's why I got rid of them. I have aftermarket rails as well. I'll call huron speed though and see if they can work something out with me.
my turbo is a 7875 with a 1.25 housing with a 4” exhaust outlet. If you (I don’t remember what turbo you have) have a regular 7875 you can upgrade the housing.
iirc you have a 76mm? I think you’ll have a fun ride but I’m pretty sure you won’t get to 700 wheel with that turbo. And when you upgrade, you might as well skip the regular 7875 and do one of the big boy or hybrid 7875. Mine is kind of a hybrid. It came with a .96 exhaust housing and a 3” outlet and I put a much larger, free flowing 1.25 housing with a 4” outlet. Yea I had to redo my exhaust but it was well worth it. I could tell it was choked before.
and for what it’s worth, putting a cutout on the downpipe will free up noticeable power. Mine probably picked up 70-80hp when I opened the cutout. Boost went up 2 psi and it was freer flowing.
don’t cheap out on the wastegate or you’ll be sorry. The cheapos don’t last for street driving and when it seizes shut, you’ll have a bad day. Spend the money on a good gate. Blowoff. Meh…I have a $40 one that’s lasted for 3-4 years. Cheapo turbo lasts too as long as you have enough oil feed to it
I just emailed the sales email that's on there site, that's the only contact information I have on huron speed and ok if i did run an external pump how how i go about doing that? Do i have to run a new line to do that or do I just put it in the middle of my existing feed line?
So basically, when you're putting around, you're running on the 340 and when boost comes in the Weldon steps in.
Or do the 340 in tank and one or two 380's in parallel and tee them in, @Forcefed86 is a big advocate for this method.
@Prostock John how did you plumb your Weldon?
I havent found many people around here that have been very helpful. Hes about the only one that I've found that I can take my truck too and he will tune it and put parts on it if I'm being to lazy to mess with. Also The FIC website calculator says the 850cc on e85 with a turbo is good for 734 on the tire and the 1000cc are good for 863 on the tire.
Its always better to have a little too much injector than be on the edge.
I havent found many people around here that have been very helpful. Hes about the only one that I've found that I can take my truck too and he will tune it and put parts on it if I'm being to lazy to mess with. Also The FIC website calculator says the 850cc on e85 with a turbo is good for 734 on the tire and the 1000cc are good for 863 on the tire.
I'm well aware of what the calculators say, but theres many other variables that isnt considered in those calculators, I went by that when I bought my 80's and here i am, maxed out on pump gas. If I go to e85, I'd have to turn it down a good bit. Real world experience usually doesn't line up with those calculators. You think a truck will put down as much hp to the tire as a car will with smaller, lighter wheels, lighter axles, diff...etc? Well I guess it boils down to this: Do what you want, experience the money wasting first hand and then you'll know for sure what your answer is. OR you can take advice from guys THAT ALL HAVE turbo cars and have been where you are. If 80's would do what you want, what would be our motive for telling you that you need to go bigger? We gain nothing from that. We are only sharing our real world experience. Those calculators might get you in the ball park, but always err on the larger side when dealing with a boosted car and fuel system because if you don't you'll end up having to do it again later. Or worse, you'll toast and engine. And still have to do the fuel system again.
Personally, I think two 340's is enough for 700wheel, thats 680 liters per hour if your fuel line is done right. I have two aeromotive 340's in tank. I don't care for walbro either, can't bring myself to trust them. The aeromotives been in my car for years....the main one been in there long before the turbo.
Last edited by Kfxguy; Aug 10, 2023 at 11:25 AM.
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From: Louisiana
the 80’s will be enough for 700 on pump gas. I’m probably at 700 wheel as it is. I’m running 22-24psi boost on pump gas but I do have a small shot of methanol/washer fluid when I get over 18psi got insurance. You can make 700 wheel on pump gas depending on turbo, and fuel system. I run mine richer as the boost goes up. I might lose a couple hp running it on the rich side, but it’s been holding up to my thrashing for 3 years now.
my turbo is a 7875 with a 1.25 housing with a 4” exhaust outlet. If you (I don’t remember what turbo you have) have a regular 7875 you can upgrade the housing.
iirc you have a 76mm? I think you’ll have a fun ride but I’m pretty sure you won’t get to 700 wheel with that turbo. And when you upgrade, you might as well skip the regular 7875 and do one of the big boy or hybrid 7875. Mine is kind of a hybrid. It came with a .96 exhaust housing and a 3” outlet and I put a much larger, free flowing 1.25 housing with a 4” outlet. Yea I had to redo my exhaust but it was well worth it. I could tell it was choked before.
and for what it’s worth, putting a cutout on the downpipe will free up noticeable power. Mine probably picked up 70-80hp when I opened the cutout. Boost went up 2 psi and it was freer flowing.
don’t cheap out on the wastegate or you’ll be sorry. The cheapos don’t last for street driving and when it seizes shut, you’ll have a bad day. Spend the money on a good gate. Blowoff. Meh…I have a $40 one that’s lasted for 3-4 years. Cheapo turbo lasts too as long as you have enough oil feed to it
my turbo is a 7875 with a 1.25 housing with a 4” exhaust outlet. If you (I don’t remember what turbo you have) have a regular 7875 you can upgrade the housing.
iirc you have a 76mm? I think you’ll have a fun ride but I’m pretty sure you won’t get to 700 wheel with that turbo. And when you upgrade, you might as well skip the regular 7875 and do one of the big boy or hybrid 7875. Mine is kind of a hybrid. It came with a .96 exhaust housing and a 3” outlet and I put a much larger, free flowing 1.25 housing with a 4” outlet. Yea I had to redo my exhaust but it was well worth it. I could tell it was choked before.
and for what it’s worth, putting a cutout on the downpipe will free up noticeable power. Mine probably picked up 70-80hp when I opened the cutout. Boost went up 2 psi and it was freer flowing.
don’t cheap out on the wastegate or you’ll be sorry. The cheapos don’t last for street driving and when it seizes shut, you’ll have a bad day. Spend the money on a good gate. Blowoff. Meh…I have a $40 one that’s lasted for 3-4 years. Cheapo turbo lasts too as long as you have enough oil feed to it
Thread Starter
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From: Louisiana
I'd tee it in, the Weldon needs a -12AN suction line and a -10AN pressure line so I'd build the system around the Weldon and then tee in the smaller 340.
So basically, when you're putting around, you're running on the 340 and when boost comes in the Weldon steps in.
Or do the 340 in tank and one or two 380's in parallel and tee them in, @Forcefed86 is a big advocate for this method.
@Prostock John how did you plumb your Weldon?
Those calculators are good to a point, you don't want to be at the edge of what your injectors and pumps can supply, if for some reason something gets off and goes lean, bad things happen really fast.
Its always better to have a little too much injector than be on the edge.
So basically, when you're putting around, you're running on the 340 and when boost comes in the Weldon steps in.
Or do the 340 in tank and one or two 380's in parallel and tee them in, @Forcefed86 is a big advocate for this method.
@Prostock John how did you plumb your Weldon?
Those calculators are good to a point, you don't want to be at the edge of what your injectors and pumps can supply, if for some reason something gets off and goes lean, bad things happen really fast.
Its always better to have a little too much injector than be on the edge.
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From: Louisiana
I'm well aware of what the calculators say, but theres many other variables that isnt considered in those calculators, I went by that when I bought my 80's and here i am, maxed out on pump gas. If I go to e85, I'd have to turn it down a good bit. Real world experience usually doesn't line up with those calculators. You think a truck will put down as much hp to the tire as a car will with smaller, lighter wheels, lighter axles, diff...etc? Well I guess it boils down to this: Do what you want, experience the money wasting first hand and then you'll know for sure what your answer is. OR you can take advice from guys THAT ALL HAVE turbo cars and have been where you are. If 80's would do what you want, what would be our motive for telling you that you need to go bigger? We gain nothing from that. We are only sharing our real world experience. Those calculators might get you in the ball park, but always err on the larger side when dealing with a boosted car and fuel system because if you don't you'll end up having to do it again later. Or worse, you'll toast and engine. And still have to do the fuel system again.
Personally, I think two 340's is enough for 700wheel, thats 680 liters per hour if your fuel line is done right. I have two aeromotive 340's in tank. I don't care for walbro either, can't bring myself to trust them. The aeromotives been in my car for years....the main one been in there long before the turbo.
Personally, I think two 340's is enough for 700wheel, thats 680 liters per hour if your fuel line is done right. I have two aeromotive 340's in tank. I don't care for walbro either, can't bring myself to trust them. The aeromotives been in my car for years....the main one been in there long before the turbo.
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From: Louisiana
I understand that, that's why I'm asking if the injectors i have which are the 80lb 850cc injectors are enough to go with the turbo I have. If I will still max out the injectors with this turbo then I will change the injectors but if they are good enough for what I have then I'll just go with it
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Best I did on a 7665 with a ls3 was 595 whp and it was a really crappy power band with a huge early torque spike and dead by 5k because of back pressure causing a falling boost curve. Just trying to keep you from making the same mistake as I did using that turbo on a 6.0
Best I did on a 7665 with a ls3 was 595 whp and it was a really crappy power band with a huge early torque spike and dead by 5k because of back pressure causing a falling boost curve. Just trying to keep you from making the same mistake as I did using that turbo on a 6.0
7875 was a bit better, would get to a little over 6,000 rpm before starting to fall over and the nose over wasn't nearly as abrupt.
damn. My 7875 Always pulled hard to 7200 on my 5.7. Maybe the cam?
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I'm red lining at 6500 NA and it doesnt fall on its face on motor so i would hope that doesnt happen and its 400 on the wheels on motor so i would hope it would at least get me to 600. It has 410 gears now but im not a fan off them. I plan on switching to 342 in hopes of getting a little more top end out of it. Also in hopes that it makes my interstate cruises a little better with the gear change. I drive this truck on the street pretty regularly.
I'm red lining at 6500 NA and it doesnt fall on its face on motor so i would hope that doesnt happen and its 400 on the wheels on motor so i would hope it would at least get me to 600. It has 410 gears now but im not a fan off them. I plan on switching to 342 in hopes of getting a little more top end out of it. Also in hopes that it makes my interstate cruises a little better with the gear change. I drive this truck on the street pretty regularly.
I didn't see what size motor you have. if you have a 6.0 and you are running a 7665 turbo on it, my prediction is, the small turbo is going to choke that size engine up and it may not even pull to 6500 rpm. Like previously mentioned, its just a poor match for just about an LS motor except maybe a 4.8.
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From: Louisiana
I didn't see what size motor you have. if you have a 6.0 and you are running a 7665 turbo on it, my prediction is, the small turbo is going to choke that size engine up and it may not even pull to 6500 rpm. Like previously mentioned, its just a poor match for just about an LS motor except maybe a 4.8.