Rear mount turbo questions

Elmo370z

Please explain, I’ll wait

gbrettin

Rear mount will never be as efficient. EGT has cooled off by the time it hits the rear.

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Boosted Performance

All you have to do is look up the boost curve and torque from any turbo kit, and it will tell you all you need to know.

There is no such thing as a "properly sized turbo" when you mount it 10 feet away from the exhaust manifolds, and then run that charge air another 14 feet (depending on charge pipe layout) back to the TB's.

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TopgunZ

Like I said, maybe it's due to the displacement advantage on LS builds vs 3.7 but hundreds of guys love these over there and it's the most popular kit. Not saying it's better than a top mount or mid mount, just saying it's been done and guys seem to be having fun.

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gbrettin

A bonus of the rear mount is that there's no additional heat in the engine bay.

But.... That's stating the obvious.

Whatever.

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Boosted Performance

Yeah, I don't know. If they like it, good on'em, it is an improvement over stock power, so there is something to like. I did a quick google search to see what the dyno charts look like with these trunk turbos, on the larger displacement engines....a 2005 Vett with twin STS kit:

https://www.corvetteforum.com/forums...urbo-dyno.html


The final numbers look great, and maybe that is the focus...but that is like an old school T88 2jZ dyno. For the displacement, there is nothing happening at 3,500rpm for example, whereas on the 370z, you'd be over 400ft/tq below 3500rpm, and it revs out to 7,500rpm

This trans am is even worse:

https://ls1tech.com/forums/vehicle-c...treet-car.html

Turbos are already well beyond maxed out, and the power band is about 2,500rpm.

I'v always been a big fan of power under the curve, vs. the peak hp/tq.

At the end of the day, it is hard to cheat physics.


Not trying to argue, and there is a product out there for everybody. I'v had customers that after some conversations, I had suggested they hit you up for a S/C kit, or Nick@SOHO for a top mount, Tony@F.I, or RJM...depending on what they are looking to get out of the car, and what they define as "fun".

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Elmo370z

Those graphs are disgusting.

Chuy

Do it I'm watching!

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Senna-F1

FYI Twin turbo rear mount video

https://www.youtube.com/watch?v=zoFB4bD7Z-I

part 2

https://www.youtube.com/watch?v=0HR9_cWW1Ik

JSur

I’ve actually been hearing the opposite on the turbo lag topic. I’ve heard from several people there’s not a big noticeable difference in lag compared to an engine bay mounted set up.


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Spooler

I watched those. He is using $89 dollar turbo's. LOL I guess if you are cheap and can't afford it then go for it. My issues is if you can't do it right then don't do it at all. I have seen folks that have done this and then their motor pops. They start whining and crying about it. Sometime you just can't protect people from themselves.

SS_Firehawk

Facebook is a world of trash advice with people trying to push their kit or what they're running. And they're usually running it because it's cheaper. Throttle response and lag is bad. There's like 25ft of piping between the hot and cold side. Wait for turbo to spool, it spools; send boost to intercooler to cool. Send to intake manifold, finally feel boost.

That sounds like bullshjt

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SouthArk370Z

I can think of only two reasons to install a rear turbo: not enough room to put it near the exhaust manifold and because race car.

The closer the turbo is to the engine exhaust, the better it works. That's Physics. Sure, a rear-mount will work and well enough for most "casual" drivers (and it does look pretty cool, IMNSHO) but, if you're worried about optimal performance, you gotta be hot.

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Jayhovah

I think the big disconnect here is that a rear mount setup can be a nice bang/buck in the smiles-per-gallon kind of way as they can be super cheap and much less complex to install. The contingent who seem to believe there is no performance difference appears to be ignorant on the science of boosting and the data available to them. Lots of parroting hearsay and as SS said - facebook is rampant with this garbage. That's one thing that makes this community good (and sometimes bad) - when someone starts pushing that stuff with no real basis we usually shame them until they leave.

The biggest problem we have in this case is the usage of peak HP/TQ numbers to compare drastically different setups.

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Last_warrior6

so im a few years late on the post but im also building a Rear mount kit and had some questions about getting oil back from the turbo. im in between 3 options but have heard negative remarks and was looking to clear some up if any of yall have any info it would help
Option 1= sandwhich plate to feed the turbo and return ( was told tht they are pressurised at like 80+ psi so i would need a hella strong pump.

Option 2= i was told to 'T' off the Presure sensor but that seems like it would be pressurised too, no?

Option 3= taping the oil pan ( was told nissans shouldnt be tapped cant remember the reason but that the oil needs to feed to the block not pan

thoughts comments ideas?

ive heard about the spacer but is there another way ?