remote turbo kit on 350????

[kelso2340]

So i have been around cars for a while now and i heard of something off the wall tonight. Mounting a turbo on your exhaust and running it back into the throttle body. WOW i can see how this works and it sounds brilliant. Now my question would be. We are doing a cheap mildly built 350 into my 91 hatch. I can pick up a real cheap t25. The v8 exhaust should be able to spool that turbo up really quickly. If i do this remote turbo set up do you think its worth it? Im not sure of what a t25 is efficient to i think like 15psi?? i may be wrong. But even still its not like i am losing any power and this seems like a reallly easy set up. So if its that easy wouldnt it be worth just throwing on there for that extra bit of power cheap and easy? thanks guys

[OutToWinPAHC]

forcing induction cant ever be cheap, or your gonna have problems. Now you say 350 with a TB. What engine do you mean (RPO code)? LS1, LT1, LT4, Gen1???

15 PSI on stock internals cant last too long.

[IHeartTurbo]

If you think a t25 is a good choice for a v8, you're going to be sadly mistaken. T25's are tiny, they aren't even worth a **** on a 4 banger.

[kelso2340]

ok well maybe not a t25 then i was just throwing it out there. But no its going a on carbed 350. and i was checking this system out and it doesnt seem to be that expensive..if you buy the kit it would be but you could make it yourself real easy

[OutToWinPAHC]

A cheap carbed turbo small block in a 240. Good luck is all I have to saw, just making the mouts and oil pan are gonna be a headache enough

[cnichols]

Not to mention that forced induction and carbs have never been the greatest combination. I say get the engine in and running first. That will take plenty of your time right there....trust me.

[WDRacing]

Carbs abd boost have been done and done well for years now. Maybe a few years back they had issues, but those are few and far between now. You can buy a carb set up for boost from any of the major brands.

As far as the turbo itself goes, a T4 ot T3/TO4 with a .81 or bigger exhaust housing is your best bet. I'd start with 6-8 psi and go from there. I doubt you'll need more to make more power then you'll have traction for.

WD

[OutToWinPAHC]

It is possible, but a PITA, and the set up would protrude out the hood. A supercharger would be much easier, and more practical

[WDRacing]

Nah, the remote setup is easy man. And cheaper then a SC would be, not to mention its way easier to adjust for more or less boost without the hassle of swapping pulleys. Are you talking about Roots or Centrifugal?

The hood is definitly gettng cut though...lol.

[OutToWinPAHC]

I was figuring a roots style. I was looking at turbo carbed small block images on google and everyone came out of the hood, and looked like it took alot of work.

I just figured hell if you have to cut the hood its blower time or SC

[jerryd87]

barry grant(maker of demon carbs) has a sealed blow through carb so you can just put a bonnet on it.(alot easier then making a sealed box) its in there mighty demon lineup, about 600 bucks from jegs, which isnt that bad considering its already pre sealed and a regular carb goes for like 350-500 bucks. plus its got all the stuff done to it so you can run gas or alcohol if you want to go for broke, can anyone say shortened ford 9 inch and massive tires?
Modified by jerryd87 at 11:51 AM 1/24/2008

[WDRacing]

barry grant(maker of demon carbs) has a sealed blow through carb so you can just put a bonnet on it.(alot easier then making a sealed box) its in there mighty demon lineup, about 600 bucks from jegs, which isnt that bad considering its already pre sealed and a regular carb goes for like 350-500 bucks. plus its got all the stuff done to it so you can run gas or alcohol if you want to go for broke, can anyone say shortened for 9 inch and massive tires?

Couldn't have said it better myself

[evildky]

there is a math fromula to help calcuate what size turbo you need, on the aproximate size of your engine you'll need something that flows 100-122lbs/min (this is a very rough aproximation) whihc is to say 3 of your average T3's, or 2 T3O4E's, and I'm sure therye are single turbo's out there large enough but I've never delt with any that large

[jerryd87]

garrett has all the formulas along with the turbo maps so you could look at exactly what you need or you could contact ststurbo.com they deal specifically with remote mount turbo systems the started with 4th gen gm f bodys and the 90's up y body both which are extreamly tight fits the advantage of these systems is you really dont need an intercooler until you hit about 10+ psi boost becuase the long piping acts as one, just have to run a little higher boost at the turbo to account for pressure drop

[240cp]

Hasn't remote mount been covered before . It just aint so easy as throwing a turbo down stream. You have to come up with a oiling system. Oil scavage pumps aren't cheap and neither are the lines. There is alot more than just a turbo back by the muffler.

[WDRacing]

You need to use a T block by the oil pressure switch for the supply line. Then run a braided line to the turbo, not that expensive. Then you use a Mocal diff lube pump for return. Those are like $170 IIRC...The oil return line can be ran straight to the oil cap or pan or valve cover etc.

The flanges and piping is far from expensive and if you own a mig welder everything is pretty straight forward.

For sizing you can't use a standard Garret chart, not that they are that good anyway. They don't address trims or the various wheels etc. Not to mention the degree of thermal expansion that far back is a lot less. So a T3/TO4E with a .81 AR exhaust housing will be pretty good IMO. When matched with a 50MM wastegate you'll have enough exhaust flow to avoid reversion and still a good boost threshold.

For more then 8-10 lbs of boost you'll want a straight T4 though. Just because of the exhaust flow issues.

It really isn't that difficult when you lay out all the details. Nor is it expensive.

WD

[240cp]

You dont have to but if it was me i would put some sort of oil pressure monitoring system in there to. Along with a oil cooler as well. Just for added security. Oil cooler prob isn't a have to because of how far the oil will be traveling in the lines and will cool naturally, but it may help. Also what about a stand alone oiling system with a resevoir, that way you wouldnt have to worry about the tapping into the engine oiling system??

[jerryd87]

ahhh i dont have much experience with turbos outside of what ive read and reasearched about them im building my sbc for a twin turbo setup but will prob end up going with one of the ebay kits(wont be running alot of boost and even if its not the best setup cant go wrong with the entire kit for 900 bucks i have known people who have spent over half that just on headers) i know turbonetics used to have charts too but cant find em, thats really the only way i know how to size a turbo for a engine