dirty454

I have searched but am not satisfied with the info i have found. I want to run twins on my 350 a cheap "junkyard" kit. I was looking at a set of 6.5 diesel turbos but through searching have found this to be not sucha good idea because it would be hard to spool up under 4 grand. I would like boost to come in at about 2 grand, what other turbos would you all recomend, I was thinking maybe a pair of HOLSET HY35W. Has anyone here run these on any simular V-8 twin setup and how have they perfomed.

Ravage70

Well if you wanted to save time and money you could just get one decently sized turbo.
Less piping,
CHeaper intercooler,
And I assure you the power will be the same as if you had 2 turbos

90dx

There is a limited number of turbo V8 guys around here but Im sure we could help you.What are your hp goals?I think the HY35W would work great in a twin application as I believe they are capable of 4-500hp a piece and they spool fairly quick considering what they are capable of.As far as spool time that is a tough call i would think you would be little higher than 2000rpm but I'm not really the one to be answering that question.It really depends what your ultimate hp goal is as a couple little T3 60 63 would probably spool really nice at pretty close to your rpm goal and they are easy to find.You would be limited to roughly 55-600hp though and i think they would start to become a flow restriction around 56-6000rpm.Westcoast turbo[sponsor here] has T3's on sale for 299 a piece right now as well so for 600 you could have two new turbos.Joseph Davis on this board and another guy whos name i cant remember know quite a bit about the Holsets.If you know where to get a good deal on a HY35W please send me a link as I am thinking about getting one myself as I'm a huge fan of them.

dirty454

I am looking for around 700 streetable hp. I already have roughly 450hp and i just plan on droping the compression a couple points with the thickest head gasket i can find and it should get me to around 9to1 and run around 7# untill i can buy new slugs. Is there anyone here with a 68 Camaro with a simular setup. I am up for sugestions

90dx

The twin HY35W will more than get you your hp goals im just not sure when exactly you will get boost.the other problem is I dont think they are really effecient until you crank up the boost.They were designed to be ran at 20-25psi from the factory.There unfortunetly is not many turbo V8's or 68 Camaros here.I wish there was.You should post some pictures of your ride.Im currently helping a friend with a Nova project that will be single turbo blow through.Like I said before the turbomustangs forum has a pretty good sbc section to it.Lots of nice setups there.Single may be easier to setup as that is the route we are going with my freinds Nova

16vTurbo

A buddy of mine is running twin 6.5L turbos on his 302, spools just fine, full boost by 3500rpm. On a 350 it would be even sooner. HW35s are lazyer turbos than the gm diesel stuff. Compressor side is way bigger.

gt350

like stated below the holsets don't care for low boost too much. there happy at about 14psi on up. I had a 2.3L 4cyl and it spooled an hx35w(12cm housing as apposed to 9cm) to 25psi around late 3000's, with a 2.0L dsm and a hy35w my buddy spooled 30+psi by 3300rpms. I would also reccomend looking into a nice single turbo like a t04r(t-67) its the largest turbo you can run with a small shaft(the big shaft stuff is expensive) if you ran a t04R with a P trim turbine wheel and .96 or larger tangential turbine housing I don't see why you couldn't make 700streetable hp. the honda guys are getting 700-750whp with them on little 1.8-2.0L engines granted there running 30+psi on racegas to get those numbers.

NCHATCH

you should try twin t3t4s this is the easiest set up and are becoming such a common turbo that they are readily available and cheap.

i would go with something in the high exhaust AR like a .82, or .96, cause you dont want to run into exhaust turbine flow choke

dirty454

This maybe a stupid question but if i was to run a pair of 6.5's and spool up was a problem do you think a smaller header diameter would increase exaust volosity enough to make a differance. The reason I am kind of leaning toward diesel turbos is because you can find them easily at ever local pickapart in the state real cheap like 50 bucks on the old gm's and if a 6.5 is governed to what 3500 and a my 5.7 will do twice that. To me the math adds up but I have been wrong before, Please set me strait.

gt350

the problem with diesel turbos is there designed for high pressure ratio's most of the time but will it work? most likely. is it ideal? probably not. you don't want to go too small on header diameter otherwise you'll create unwanted backpressure more than there is all ready. the key is to make the post turbine exhaust as least restrictive as possible. if it doesn't spool up the way you like it, I would look into a better cam that is suited to boost. changing a camshaft is very easy and could be a very wise investment in your application.