Rear Mount Turbo Ke55

[Hiro Protagonist]

Hi Anastasios.

 

I'm not sure on the location, at first i thought after the diff? But now with a few other questions being raised (like lag ect) before the diff might be a better choice. This will give Shorter runs for the pipe work, and if I need a muffler I can sneek one in after the diff.

 

Just stealing some ideas and trying to "think outside the box". I'm off to the wreckers today to see whats available for the project and what it will cost. If its to expensive then i will drop it, but if I can get the parts nice and cheap I will give it go for sure :laff:

 

I'll join the nay-sayers camp and say that it just isn't worth it. In addition, saying that you'll put it before the diff for better response/less lag is laughable - you've still got a good 2-3 metres worth of intake pipe before you even reach the engine bay, so 50cm less isn't going to improve things greatly.

[go baby go]

I'm loving the intrest and the input.

 

Please don't think that any ideas you all offer are just pushed to one side or ignored I am taking this all in and you are helping me look at this from all angles. Cheers.

 

G,day Hiro Protagonist. You raise a valid point about the length of pipe but...(theres always a but) I'm not running an intercooler (no you did not talk about an intercooler and yes this is part of my justification process) so from what ive seen there can be (but not always)alot of pipe work involved in going from the turbo through an intercooler and then to the inlet. I know with the FMIC kit I got for my Supra the pipe work would have increased at least a meter on the existing/ stock pipe work.I also realize that a KE55 is alot smaller than a supra.

 

I know that following the tried and tested way is the best/cheapest way but when I get an idea in my head I need an exorcist to get it out.

[Hiro Protagonist]

I'm loving the intrest and the input.

 

Please don't think that any ideas you all offer are just pushed to one side or ignored I am taking this all in and you are helping me look at this from all angles. Cheers.

 

G,day Hiro Protagonist. You raise a valid point about the length of pipe but...(theres always a but) I'm not running an intercooler (no you did not talk about an intercooler and yes this is part of my justification process) so from what ive seen there can be (but not always)alot of pipe work involved in going from the turbo through an intercooler and then to the inlet. I know with the FMIC kit I got for my Supra the pipe work would have increased at least a meter on the existing/ stock pipe work.I also realize that a KE55 is alot smaller than a supra.

 

I know that following the tried and tested way is the best/cheapest way but when I get an idea in my head I need an exorcist to get it out.

 

The problem is, you're going to end up with the same amount of extra pipe length (or more) than a FMIC except you won't actually get the benefits of having an intercooler.....

To me, it just seems like a lot of wasted effort trying to hide a turbo - if a cop pulls you over and wants to see under the bonnet it will be because he has suspicions that you're running something illegal - with the amount of room in a KE engine bay (and thus easy to see things) it will look quite suss with the intake pipe running up from underneath the car. The only times I've seen rear-mounted turbos used (as was mentioned above) was in cars with ridiculously tight engine bays (and most things covered by plastic anyway), such as an ISF (although in the videos on Youtube of one you an actually make out the turbos sitting where the rear mufflers would be, and thus visible from directly behind the car - ie not stealth at all.

 

 

Although I must say, here's a car with rear-mounted turbos that I really like (just ignore the fact that the engine is mid/rear mounted too :P)

[philbey]

Hi go baby go,

 

Interesting concept....

 

Personally, I reckon it's a ridiculous idea; sorry but no other words for it. Forget the lag from the compressor to the engine, what about the fact that you will dump a significant portion of your exhaust heat in that 2 metres from manifold to the turbine.

 

Turbo's are all about heat, the lower your inlet temperature, the less efficient you will be, plain and simple.

 

I cannot see the point; if it's just to avoid a defect, there's plenty of other ways around it. Spend the money on making a turbo setup look discreet and end up with more power anyway!

[towe001]

Sure the intercooler might have added an extra metre to the intake ducting but the turbo more or less stayed in the same spot on the exhaust, it didn't get moved about 2 metres away from the motor.

You'll be suffering from a bad case of lag on when the exhaust is able to give enough pressure to be able to start even thinking of spooling up the turbo.

I'd suggest looking at going efi and look into "anti-lag" ideas.

I don't remember which manufacturer (european french ??) it was but sometime back at least one rally champ car (group b?) was running an anti-lag setup that had a pipe going from the intake side (after the turbo) to the exhaust between the motor and turbo with something like a spark plug and an injector in it. When the throttle was closed the pipe would open for a few seconds or so and the charged air would go into the exhaust, mix with a squirt of fuel, ignite from the spark plug and keep the turbo spooled. The turbo was a metre or so away from the motor.

 

But all in all apart from full or close to full throttle would be the only real way of driving the car.

[philbey]

What I probably didn't make clear: This setup will work and make you some extra power. But the same setup mounted off the exhaust manifold will make much better power.

 

Rally cars feed fresh air into the exhaust upstream of the turbo to combust any remaining fuel which keeps the turbo spooled.

Edited January 14, 2011 by philbey

[cinky]

the rear mount turbo systems you are thinking of are available for the ve ssv commonwhore. i wont nah say because thats every says about my car being more show than go. don't know much about the exhaust set up you have got , is there space closer to the engine to mount it? have you thought of electric turbos? then just re jet accordingly? I'm guessing you are on your opens? if its sleeper/ granny spec shouldnt be too much drama from the blues brigade. i had mini cooper on my reds with elec turbo never had any drama

[GJM85]

I was thinking of putting a turbo in the glovebox.... for stealth! :fairy:

[GJM85]

Although I must say, here's a car with rear-mounted turbos that I really like (just ignore the fact that the engine is mid/rear mounted too :P)

 

If my name as Mad Gav and it was a post-apocalyptic world, that would be my ride....

[Twinky]

have you thought of electric turbos?

 

Please don't say you are serious about that................

[go baby go]

The problem with putting a turbo in the glove box is where do you put your gloves?

 

OK so no to the rear mount turbo.

 

:hmm: How about a super charger running off the drive shaft down near the diff. After going thru the gear box the rotation....Ha Ha Ha I'm not serious but now that I mention it. :bash:

[cinky]

ok electric turbo let me explain first. for those that have worked on minis will know that the carbi is hard pressed against the fire wall so i made a cold air induction but this affected mixture ratios at high speed and low speed. ran rich at low speed and lean at high speed because of the way it was setup. those that know how ram charging works well i had one pointed directly at the grill but there was almost a metre of induction piping between the inlet and the carbi so i installed a inline elec turbo. all it really was a fan to draw air at a stand still. but it really helped to push air into the engine without running the risk of totally blowing it as what would of happened had i put a full turbo kit on it

[Hiro Protagonist]

ok electric turbo let me explain first. for those that have worked on minis will know that the carbi is hard pressed against the fire wall so i made a cold air induction but this affected mixture ratios at high speed and low speed. ran rich at low speed and lean at high speed because of the way it was setup. those that know how ram charging works well i had one pointed directly at the grill but there was almost a metre of induction piping between the inlet and the carbi so i installed a inline elec turbo. all it really was a fan to draw air at a stand still. but it really helped to push air into the engine without running the risk of totally blowing it as what would of happened had i put a full turbo kit on it

 

That's not an electric turbo, that's an electric supercharger (as it isn't driven by the exhaust), and 99% of them are absolute crocks of shit with no benefit whatsoever (other than the placebo effect), it has been proven time and time again that they are bairly more powerful than a PC fan, which is a good order of magnitude less than the airflow required to run your average car.

[cinky]

well he asked for opinions so i thought id let him know what other options are out there as most of you have said rear mounts are useless due to lag. well i found these helpful just to stuff a whole heap of air into the plenum while at idle thus producing sightly more air to be able to drawn thru the carbi when going from idle stand to full throttle. I'm in no way saying its a great set up just saying it worked for me in that situation. after all some mild head and cam work would be just as benificial. but if you want to try something diffirent then go for it id like to see how i turns out.

[Hiro Protagonist]

well he asked for opinions so i thought id let him know what other options are out there as most of you have said rear mounts are useless due to lag. well i found these helpful just to stuff a whole heap of air into the plenum while at idle thus producing sightly more air to be able to drawn thru the carbi when going from idle stand to full throttle. I'm in no way saying its a great set up just saying it worked for me in that situation. after all some mild head and cam work would be just as benificial. but if you want to try something diffirent then go for it id like to see how i turns out.

 

That's the problem though, they DON'T stuff a whole heap more air. Remember engines gulp down a heck of a lot of air even at idle - over 10L/second for a 2L car, and that gets much bigger very quickly (would probably be at least tripled in flow before you hit peak torque or power).

 

Try this article on for size:

Electric supercharger