Thinking about another sloppy build - input?
Thinking about another sloppy build - input? Used to have a sloppy RCSB 4.8 Silverado with a billet 7875, loved the surge of power for a shitbox truck but had to sell it to fund other projects. Fast forward a couple years, and I am wanting to build a sloppy tire burner again.
Picked up a local Gen III 6.0 and 4L80E - the goal is at least 550-600whp on the street for a fun cruiser and burnout machine. Thinking of doing a late model Crown Vic (03-11) cop car. Might see the dragstrip a couple times a year, but 95% will be street and highway abuse.
Will the dontbsme combo work well for a car this size (4100 lbs), 3.27-3.55 gears, and a 6.0?
I'm thinking of copy pasting from my sloppy silverado build, except that was a 4.8.
SS2 cam/1218 springs
Bosch 80# injectors
Fuel will be 93 pump, no E85 by me. Needs meth?
80E w/ HD2, Jake's 3200 street converter
Car intake to clear hood, LS1 vs LS6? Is the power difference between the two worth the premium for the LS6?
What turbo? Looks like VSR has a new billet next gen 7875. Trying to keep the cost reasonable in case something blows up.
My biggest gripe with the silverado I built was that it was a dog off the line if you just punched it. It would accelerate like an N/A truck until about 4,000 rpm when all the boost hit. Reviewing my old tunes it looks like a lot of that was due to mediocre timing advance (overly conservative), but if I can select a turbo/converter/gear to help that out, that'd be awesome.
I'm gonna go watch the dontbsme clone videos now, lol.
Picked up a local Gen III 6.0 and 4L80E - the goal is at least 550-600whp on the street for a fun cruiser and burnout machine. Thinking of doing a late model Crown Vic (03-11) cop car. Might see the dragstrip a couple times a year, but 95% will be street and highway abuse.
Will the dontbsme combo work well for a car this size (4100 lbs), 3.27-3.55 gears, and a 6.0?
I'm thinking of copy pasting from my sloppy silverado build, except that was a 4.8.
SS2 cam/1218 springs
Bosch 80# injectors
Fuel will be 93 pump, no E85 by me. Needs meth?
80E w/ HD2, Jake's 3200 street converter
Car intake to clear hood, LS1 vs LS6? Is the power difference between the two worth the premium for the LS6?
What turbo? Looks like VSR has a new billet next gen 7875. Trying to keep the cost reasonable in case something blows up.
My biggest gripe with the silverado I built was that it was a dog off the line if you just punched it. It would accelerate like an N/A truck until about 4,000 rpm when all the boost hit. Reviewing my old tunes it looks like a lot of that was due to mediocre timing advance (overly conservative), but if I can select a turbo/converter/gear to help that out, that'd be awesome.
I'm gonna go watch the dontbsme clone videos now, lol.
I picked up an LS1 intake, cheaper than an LS6-was just watching one of Richard Holdener's vids where he tested like 20 cath port intakes, the HP diff was pretty wide-but the diff bet the LS1 and LS6 was like 30 HP around 6500. The poor LS1 was the one they used as the lowest HP to compare the others to.
i have a similar combo in my truck right now and i'm really liking it.
5.3/ mild truck cam/$250 ebay 7875
the key for the combo was a little bit of converter. I'm using the cheapest torco "GM88SS" 2200 i could find. With a 50/50 mix of dex 6 and hygard lo-vis it flashes to 2300 when you powerstand it.
I think with more cubes you could get away with more cam (ss2) but you'd definately need that actual 3200 rpm converter
5.3/ mild truck cam/$250 ebay 7875
the key for the combo was a little bit of converter. I'm using the cheapest torco "GM88SS" 2200 i could find. With a 50/50 mix of dex 6 and hygard lo-vis it flashes to 2300 when you powerstand it.
I think with more cubes you could get away with more cam (ss2) but you'd definately need that actual 3200 rpm converter
I went to ebay and typed in "7875 turbo" and it was literally the first one that popped up. They come in 2 flavors, just the A/R is different. That turbo won't choke a 6.0 until higher boost.
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I ran out of fuel around 12psi and 560whp on 1 aem400 and 80lb injectors. Mine wasn't plumbed the best. But I'd say no... you'll want larger injectors for e85. WIth 2 aem400 and 70psi base i'm at 19psi now on 80lb injectors. (5.3) Pressure isn't dropping, but I'm at 98% DC.
Wish I had, I tuned it on the street and sold it. Guessing 500whp? It had pretty safe timing, thinking around 13* IIRC on pump 93, no meth.
alrighty boys, time to bump this thread and start thinking turbo selection. @truckdoug I see the link you posted, that one is $2,700 now? That's more than the car cost, can't be right for just a china charger and no kit.
What A/R for this combo? Stock 6.0 with truck intake, SS2 cam. Car is about 4100 lbs with 3.27 gears, stock converter now but will eventually throw in a 3200 budget deal from Circle D, Jake's etc.
Cast 7875 ... Looks like a tiny .75 A/R
Next Gen cast 7875 A/R .96
Again, goal is 550-600whp on pump 93, no meth. Car is 99% street driven so spool time is important, want to minimize lag. Also, I would like to hopefully just install the turbo once and not have to deal with upgrading a few months from now because I'm itching for more power...a 3" downpipe would be convenient as well.
If E85 is required I can switch to that, but currently running on a single 450 so I'd prefer not to have to re-do the fuel system if possible to support that.
What A/R for this combo? Stock 6.0 with truck intake, SS2 cam. Car is about 4100 lbs with 3.27 gears, stock converter now but will eventually throw in a 3200 budget deal from Circle D, Jake's etc.
Cast 7875 ... Looks like a tiny .75 A/R
Next Gen cast 7875 A/R .96
Again, goal is 550-600whp on pump 93, no meth. Car is 99% street driven so spool time is important, want to minimize lag. Also, I would like to hopefully just install the turbo once and not have to deal with upgrading a few months from now because I'm itching for more power...a 3" downpipe would be convenient as well.
If E85 is required I can switch to that, but currently running on a single 450 so I'd prefer not to have to re-do the fuel system if possible to support that.
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The ebay one is $2700 because they're out of stock and re-listing costs money, so they bump the price to prevent anyone from buying it without being forced to cancel/relist and lose any hotlinks anyone might be using or anyone watching the item.
Minimum .96 A/R.
Minimum .96 A/R.
Thanks, I'll have to see if VSR has any Christmas sales coming up.
Regarding exhaust...it will probably be a 4" downpipe coming off the turbo, I refuse to cut a hole in the fender as I like my cars to be quiet on the street. I was thinking of doing a 4" boost activated cutout roughly by the transmission, and making a wye from there connecting to the factory true dual 2" exhaust to keep it quiet when not in boost. I wonder how much that will restrict me when I'm not in boost.
Regarding exhaust...it will probably be a 4" downpipe coming off the turbo, I refuse to cut a hole in the fender as I like my cars to be quiet on the street. I was thinking of doing a 4" boost activated cutout roughly by the transmission, and making a wye from there connecting to the factory true dual 2" exhaust to keep it quiet when not in boost. I wonder how much that will restrict me when I'm not in boost.
Got the swap done, turbo kit is ready to be installed, just wondering about fueling as we go forward. I currently have the car roughly tuned on 93 pump gas, but when the turbo is installed I'm wondering if it's worth it to just go to straight E85 for the safety factor. Flex Fuel doesn't seem to be an option since I only have the 2 bar / 3 bar option available for my PCM. Still need to check the hardware #/OS, it's the factory PCM out of a 2004 Express van.
I'm wondering if I should just fill it up with E85 and tune the VE now, so that when I'm done installing the turbo kit I can just work on the boost fueling (PE/BE) and enjoy it. I've never messed with E85 so I'm not familiar with the general ignition and AFR targets. What's a good starting point for 10-14 lbs on E85 for AFR scale on an AEM UEGO, and what can timing start at? I'd just go and read plugs from there to see how it's liking it. This is purely a street car so I'm not looking to wring every ounce out of it, just want a safe fun setup that I can hammer on all the time.
I'm wondering if I should just fill it up with E85 and tune the VE now, so that when I'm done installing the turbo kit I can just work on the boost fueling (PE/BE) and enjoy it. I've never messed with E85 so I'm not familiar with the general ignition and AFR targets. What's a good starting point for 10-14 lbs on E85 for AFR scale on an AEM UEGO, and what can timing start at? I'd just go and read plugs from there to see how it's liking it. This is purely a street car so I'm not looking to wring every ounce out of it, just want a safe fun setup that I can hammer on all the time.
Here's what my '04 Express P59 shows currently - already did the OS swap to a 3 bar.
Looks like Flex Fuel is already present in the tune, just need to enable it and tune VE/timing?
Do I just say **** it and tune it using the normal VE table and straight E85 all the time? Will the variation in alcohol content with different blends and times of the year cause enough of a difference to affect the tune (cruise/WOT)?
Looks like Flex Fuel is already present in the tune, just need to enable it and tune VE/timing?
Do I just say **** it and tune it using the normal VE table and straight E85 all the time? Will the variation in alcohol content with different blends and times of the year cause enough of a difference to affect the tune (cruise/WOT)?
Last edited by LQ4-E39; Feb 19, 2021 at 02:10 PM.