Are there any factory turbo's big enough for a V8 ?
 

Im wanting to do a DIY turbo setup. I cant seem to find any turbo's off factory vehicles that are really big enough for a modified V8. Are there any that anyone knows of ? I would REALLY prefer a single. I would consider a twin setup if I have to though. Its for a 331, sbf.

what heads/cam/intake etc. just so u know a pair of t3 turbos will make more then enough power to split ur stock block in half

another option would be a larger t70 turbo with a t4 inlet.

the t70 is a popular option in the diy mustang circles, set of bbk shorties flipped over with a custom merge pipe

if u go that route make sure u get a full t4 t70 thats atleast a ptrim

Its a Dart block. I was going with a GT 4788. Just looking to save money and get performance close to that.

ur only option would be like a set of twin 60-1's/t61 if u wanted to go twins.
but honestly id go with a single bw s475 which can be bought for just under 600 bucks brand new.that turbo has pushed many small blocks well into the 8's

this thing carbed or fuel injected

I had looked at that one, and the 480. One guy told me he built one with the same engine as mine. same heads intake, ect, and it went 8.20's with the 47-88. I'm just looking for low 9's. 475 good for that ? The cars only 2900lbs with me in it.

475/480 would deff put u there with room to spare check out the pm i sent ya should find it very useful

Its a blow thru carb (CSU). Cool, Thanks man. I was just trying to get away from having to spend a couple G's on just the turbo. lol

the s475 is a bad ass turbo i have a custom s475 (t4 based) going on my v6 in my camaro soon. for the price u cant beat it

Borg warner GM5 turbo from the General Motors 6.5L V8 diesels used in their pickups etc. in the 90's.

2 of those would barley cut it for the power hes looking to make

^Unless I'm blind, I don't see where he mentioned how much power he wanted to make...?

But now that I read his application/use, your are correct. the GM5 won't do the job... Not reading every post owns me...lol.

OnebadV6 and I have been PMing. I think it was there, and I accidentally took it out when I edited my posts. Sorry for the confusion. Here's a link to my build thread. To give you an idea of what Im doing. Ive looked a a few turbo's. Off of backhoes, bulldozers, '07 Duramax, ect, too. Some of those I could have gotten free. None that I had access to were big enough. Maybe with twins but I dont want twins really. If any of those are big enough(without modifying them) I would consider twins. Since I can get them free.
https://www.homemadeturbo.com/f42/ne...-build-118321/

Forgive me, I still don't see where you've mentioned how much power you're looking to make. Based on the 750 carb, your looking for about 500hp? Shouldn't need a turbo to get that kind of power from that engine...

900. I assumed you would see the 3 example turbo's, and could tell if there were any close to that size. I make almost 500 now, and about 650 on nitrous.

Ahh 900. ok. Now I have a number to work with...lol.

May I ask why you want to use a carb? Fuel injection is much easier to tune with forced induction...

Also, how high are you planning to rev it and where do you want your peak hp/torque?

GT47 series looks to be a good match. S475 looks like it may start to run out a bit up top...but that depends how high you want to rev it...

Money mainly, and the cars already a carb. I will be doing an EFI swap eventually. Using my carb intake converted over. Ive been told by several people this is probably the best way to go. Since I have no experience with standalone EFI systems. Almost all my cars have been EFI, but in the Mustangs I just ran the stock A9L with no tune, and had a chip burned for the GM stuff. Using the stock ECU. Tuning isnt an issue though.

I have people helping me that really know what theyre doing. They run mostly big block Chevy's with blow thru's. In Outlaw drag radial racing. Ofcourse they want me to spend a couple G's on just the turbo itself. Which they can afford, but I cant. lol The 475 or 480 cuts the price down alot. Im just wanting to see if thats as far as Im going to be able to cut it or not. Like most people, I need to save all I can

Yeah, no, was just curious. These days it's unusual to run a carb with a turbo. I don't know if you heard of it but the company "fast" has an EFI auto tuning system that, essentially, tunes itself. We've used a similar feature with megasquirt with a program called tuner studio and the ease of tuning is much beyond what it was even 2 years ago.

If you're worried about not knowing how to tune the EFI, there are solutions out there.

If you want to run carb and you've got people helping you who have done this before and know what they're doing, then by all means.

Good luck with your build. Let us know what turbo you end up using and tells how it works out. How high are you planning on revving this engine? If you keep it under 6500-7000 the s475-480 should work well. It looks like anything above 7000rpm on the s476 and you're getting below 70% efficiency. What's the exact displacement of this engine?

blow threw carb aint bad alot of guys run them and they work good though they can be a lil picky with weather changes and altitude changes.

fast is a veryy nice system but carries a big price tag.

when i first started my camaro build i bought a megasquiirt 1 v 2.2 system for 311 bucks. well prior to this i had no experiance tunning efi. the install took me about 7 hours. and i had the car up and running pretty good in about 2 days. if u have the patience and dont mind reading megasquirt is deffinatly a nice system to use.megasquirt 3 with the msx expasion board will do anything any of the super high priced stand alone units will do.hell even a megasuirt 1 or 2 will do the same stuff.

megasquirt also has awsome support if u run into any problems or need help with anything.

Yep, that's why I love megasquirt! We're running MS2 on our MR2. For how much it costs and does compaired to other big-name EMS systems, and considering how capable MS is, I don't get why more people don't go MS. It's like they think they need to spend over a cerain amount of money or it doesn't work...lol. And it's open-source! What more do you want? lol There are many excellent tuning programs out there for it, one of the best right now is tuner studio. I was blown away when we first started messing around with it. Very powerful and user-friendly.

I'm interested to see this blow-through carb setup when you have it up and running. Post pics!!! :)

You want a turbo big enough?

Call freightliner :)

I have some pics of turbos that would be overkill for your setup

I was actually talking to a friend that drives a dump truck. He was checking with some mechanics for me. lol The question is whats the price tag on one ? lol Im looking to make about 900 or so, and be able to crank it up to about 11 or 12 when Im ready. I know turbo's I can do it with. Im looking for one I can afford to do it with though. lol Do you know any particular ones that would be good off a big truck ?

I am going with EFI eventually. Im going to learn about the turbo's first though. Then the EFI. That way Im not trying to learn 2 things at once. lol

I know someone who is making over 500 WHP with a turbo 4 cylinder with a holset turbo from a Cummins. I don't see why a twin setup could be used to make 1k

Why not consider Holset turbos. They're inexpensive, OEM factory turbos and quality, and have plenty to choose from in sizes, etc.