i hear plenty good things about rear turbo'ing, have any of you guys done it?

 

From what I hear its not very efficient and it requires allot of piping. There is also more turbo lag because the charge pipe is so long. The turbo unless its housed in something receives allot of abuse from the road. Other than weight distribution and cluttering an engine bay I'm not so sure what the benefits are? 3rd gens have fairly large engine bays and should have no problems introducing single or dual turbos inside.

I believe car craft? did a rear turbo setup on a 4th gen trans am a long time ago. I will see if I can find the article.

I know STS makes great rear turbo kits.

 

i read an article, they say the rear turbo has alot less lag and is more efficient too and the length of the piping eliminates the need of an intercooler

http://www.chevyhiperformance.com/te...rbo/index.html

 

there is no way that it has less lag... it's not physically possible

I'd love to see one of these threads with info about parts and what works (like a good source for a cheap oil pump) rather than debating performance- if you want that you can search the 64thousand other threads here and on every other f-body, y-body, mustang... board about this.

 

I heard the turbocharged CRF450 on N2O powered trunk mount superchargers are better. Better power to weight ratio and no parasitic loss.

Me too, but I have never seen a cheap electric motor driven metallic-gear-drive pump that was cheap. When I put an oil temp sensor in a turbocharged engine oil pan and ALDL logged I found that the highest I recorded after prolonged 10PSI boost was 230* F. If there is a little room for a cooler between the turbo outlet sump and pump then a cooler might get it down into the shur-flo (cheap pump) specs.

 

Sounds to me like they attempt to keep lag in check by using smaller tubing thus keeping the total volume close to the same as an under the hood install. Somehow I doubt they are equal though. Cool concept.

 

Yeah, and we all know how great tiny pipes flow for HP. Great idea? Think about it. They keep lag in check like any other turbo design. Run a smaller wheel and A/R which of course chokes the top end. Notice they are making street kits with lower HP so of course a smaller A/R can be used to reduce lag.
Check out the cheated cut on the pipe into the turbine. Wow, is that ugly. There is huge volume decrease right there. No true race shop would ever put their name on a cut like that.

Nice cheap worm clamps on the charge pipe. I would have expected T-bolts for the price of the kit. Welding a pipe without a jig and the blurb says "ensuring quality". Interesting

From the article "there is no added heat build-up and the system is cooled from fresh ambient air, which creates denser exhaust molecules to propel the turbo's turbine wheel more efficiently. "
Someone needs a high school Physics refresher. It amazes me how many people believe the BS that STS puts out about turbocharging.

 

yeah i agree with that, you would have to be an idiot to believe that rear mounted turbo in that article would be efficient over one in the engine bay, also i remember something about exhaust pulses, the further away it is, the more the turbo would constantly spool up between pulses which would increase wear, and the space constraints under an F-Body would make the turbo more of a hassle to do than in the engine bay

 

Yes, a sponsored magazine article will tell you the whole truth and nothing but the truth and is not intended to boost sales

If you know anything about how a turbocharger works and thermodynamics you know that efficiency goes down with exhaust temperature, it's the heat energy that is converted into kinetic energy, not so much flow. The rear mounted turbo is a compromise upon a compromise with small sized turbines to reduce lag. the whole marketing blabla they put out is a twisted description of the actual facts. Simply put, drawbacks reworded to make them sound like they are beneficial.

If you don't believe it, check out where porsche for instance puts their turbos and have been doing so since the beginning. They (and BMW in F1) were the real pioneers of turbocharging and especially Porsche has to be credited with improving reliability and bringing it to the mainstream.

Read Corky Bells book or Hugh McInnes' book, then you will know why not to do a rear mount. The fact that it does work to a certain degree doesn't make it a good system. For the same amount of money & equipment you can build (or buy) a system that is vastly superior and will outperform the rear mounted setup.

 

I personally dont think that a rear turbo is better, i just dont want all that under my hood and i like the way a rear turbo looks under there. also not tryin to get alot of boost on my 383

 

Think you guys are over analyzing it, not everyone needs a highy tuned system on their car. Just look at the example in that artical, what they made another between 100 to 150 more hp? Think that would put a smile on most peoples faces. Now I wouldn't buy one of STS's systems since some of their prices are kind of ridiculous but I do like the idea of not having a turbo under the hood cooking all my wires and plastic parts and making them brittle, plus the install looks to be lot easier. Bottom line is they do work, they might not be the most efficient type of power adder and you might have little more lag then one that was built under the hood but who cares, you will still be flying down the road.

 

yea i agree. i just want a little more pep on my 383.

 

My friend bought the Blue Iroc from Hawks that had the LS1 and rear turbo and it was pretty efficient for what it was.
He recently went with a larger front mounted turbo and a built motor.
http://www.facebook.com/home.php?#!/...00000269513461

 

im pretty sure rear turbo is what imma go with, might go with two small ones

 

Just do a single, twins require double the tubing and there is little space to tuck all that tubing without losing ground clearance.

 

makes sence

 

Wonder if you could fit twins where the cats would sit, there is a nice hump in the floor that might give enough room.

 

im not using cats anyway. straight from the headers to the back so i should have room

 

i got a weird question. nothing serious but just out of curiosity, what would happen if you run the turbo output back to the exhaust instead of the engine? not as in pushing it back into the engine but like pushing the exaust into the turbo? heres a pic to explain.

 

Where would the exhaust ever exit?? The engine would choke up and die

 

LOL

You need either of these

http://kalecoauto.com/index.php?main...&products_id=2

http://kalecoauto.com/index.php?main...&products_id=3

 

also i was thinking of something, i mean its an impossible chance but with how the turbo is facing on that car towards the ground, what if it sucks up a rock, not to bash on it anymore its a good system not the most efficient, but it would be like having a high powered vacuum cleaner to the ground

 

that is why you use an air filter.

 

the exhaust would exit where it usually would, just the turbo output would go back to the exhaust

 

Ha ha

Don't forget the muffler bearings

 

ok i am also wondering if i should buy a new turbo or get ones off vehicles that come with them. turbos are $45 with a $7 core charge at my local auto yard

 

you dont know anthing about turbos!

the exhaust pipe enters the turbo to spool the compressor and there needs to be a pipe to exit the turbo for the exhaust gas to escape, and then there is one opening for the turbo to suck fresh air in, and another exit (to the motor) that the fresh air is forced into!

 

thats exactly what im talkin about, the exaust input, and then exits like normal. the pipe that send the compressed air back to the engine would go to the exhaust like in my crude picture, and the las pipe would be to suck in the fresh air. i kno how they work, i just dont think u understood me. but it doesnt matter anyway. just for laughs

 

the pipe that sends the compressed air to the engine cant go back in the exhaust, if it routed like that, where would the engine get the compressed air from?

 

yeah im not an idiot but the air filter they are using in that article is in the engine bay not on the turbo itself so if it sucks up a rock your turbo is gone

 

no its under the car, with a filter on it

 

the air sucked in from the filter

 

omg im sorry, your kind of an idiot, do some research, and come back in thirty days and admit your a retard, and you'll be smarter ... and you will admit your wrong and these ideas are stupid.

 

dude its not that serious. really.
and nobody was serious about that. were talking about rear turbos.

 

It dont matter where the turbo is placed, its still the same!!!
I'm bouncing out of this thread before I lose any more brain cells.

 

anyway. what vehicles come with decent turbos that i can pull one from?

 

Grand nationals, turbo regals. Something with a big enough turbo. I wouldnt go with any tiny turbos. Also something off a skyline or supra. They may be too small too.

 

what about diesels

 

yeah that was my mistake i browsed through the article again, right up under the left rear is the air filter, turbochargers have been fine for years where they were at in the beginning so this is a pretty useless idea

 

i think its just a way for people who dont want tooo much extra power and dont wanna do all the piping work under the hood. just a simple easy way to get a little more power. and it looks and sounds pretty cool installed

 

 

rear turbos sound sweet. i kno this is a mustang but that rear turbo sounds bad azz. http://www.youtube.com/watch?v=UV8dN...eature=related

and this vette! http://www.youtube.com/watch?v=AG2j-...eature=related

 

rear mounted turbo's have been proven to work, they do not work as well as front mounts but if set up properly they can be very similar in performance to a front mount. they aren't "just for people who want a little more cheap power".

LMR's new 1500+ rwhp C6 build is running rear 88mm turbos.

zombie on ls1tech is in the 9's with a rear mount.

stock cast manifolds and heat wrap is used to keep the exhaust gas velocity up, allowing the turbo's to spool up fast even though they are far away from the engine. an electric pump is used to supply the turbo with oil. and the turbos are generally a little bit smaller in a rear mount application. it's not that difficult to understand, a lot of you guys need to do some reading

 

well that settles it, rear i go. just gotta find the right one for my application

 

I'd like to see some third gen rear mount builds on this forum. My first choice is front mount, but I've been involved with several rear mount setups and they certainly work well. No need to upgrade your catback to larger pipe either, unless you're running mega-horsepower you won't to stay on the smaller side to keep the velocity up. Most important things are to get the oil feed and return set up right. A restrictor in the feed and a good oil return pump like the one STS uses.

 

i can get a turbo for $35. should i buy the bov and wastegate from the pulled car or get new? and how much should it cost to install?

 

Considering the hot exhaust gases expanding are what spins the turbine wheel... mounting it in the rear (like the STS systems) would let the gas cool and provide less turbine spinning. That and the gases need to travel to the rear then back to the front, on the return trip they will heat up and expand, losing your compressed air. If you don't care about getting real boost, go for it. There's a reason a turbo is mounted right near the manifold.

 

i just want a little, and that cool sound. they sound really nice mounted soo close to the exhaust exit. would a diesel turbo be too big? my auto yard has tons of imports i can probably find a turbo on. idk what to look for though

 

I'd primarily look for a turbo with an intake around 60mm in diameter or more, any smaller and two of them would be needed since typically a 60+mm is capable of 500+hp. I think a few Dodge Rams had some decent ones, but you need to study up on them to not get one with a tiny exhaust side. I've seen a few people do pretty good with ones off of ebay for $300 or so. I'm contemplating this myself too by using my big one and a tiny one placed way in the back since traction seems to be a problem even at the drags as well as making things under the hood HOT.

 

they are $35 at the salvage yard. if i can find a car with a nice one its a steal. i just wanna kno what to look for