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Best place for Turbo II builds

AJ

AJ

110 HP of FURY!
Where is the best place to go for a Turbo II build. Espesically for someone who doesn't know all that much about them and doesn't care for ever getting anything over 300hp.
 
A

asellus

Member
Turbo II build? I can only think RX7's for some reason. :p

either way, Chuck at the BF/RS Motors. Just put your foot down at 300whp. :p
 
AJ

AJ

110 HP of FURY!
Sorry, I won't ever take anything to Chuck or RS. Personal preferance.
 
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spek1098

Guest
I'm not sure what your refering to when your talking about turbo II build. Are you refering to upgraded internals or a turbo upgrade? If 300 hp is all your looking for, from everything I've heard, you should be able go get that with a tbe,cai, fmic, maybe a tm, and a good tune, as long as were talking about the MRZ. I think we run out of fuel before we run out of boost.
 
AJ

AJ

110 HP of FURY!
Yeah, I'm talking about internals and what goes along with it. I don't want a crazy turbo, but something that will spool quick.
 
dmention7

dmention7

Hater
Yeah, if 300whp is the highest you'd consider going, then I wouldn't think you'd even need to touch the internals. Bolt-ons and a tune should get you there.

A turbo upgrade, however, would probably let you get away with putting down that power a little more reliably though. The stocker will get you to 300hp, but from everything I've heard, it's dropping out of its efficiency range quickly at that point.
 
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spek1098

Guest
Yea, from what I know about turbos, quick spool and more power are inversely related. So if you upgraded the internals, your either increase the trim and lower spool but decrease power, or decrease the trim and increase power but also increase lag (let me know if I have those trims right or if I got them backwards.
 
dmention7

dmention7

Hater
That's one aspect--another has to do with the efficiency range of the turbo. Like any pump or compressor, flowrates, pressures, pumping losses, etc are all related. Turbo A may be capable of feeding 15psi to a given motor but it will not necessarily make the same power as Turbo B feeding the same pressure and flowrate.
 
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spek1098

Guest
dmention7 said:
That's one aspect--another has to do with the efficiency range of the turbo. Like any pump or compressor, flowrates, pressures, pumping losses, etc are all related. Turbo A may be capable of feeding 15psi to a given motor but it will not necessarily make the same power as Turbo B feeding the same pressure and flowrate.
Click to expand...
See this is where I lose it with turbos, how does that work? If they both both put the same mass of air into the engine why don't they make the same power? Is that where the term efficiency comes into play? From my current understanding then, it must have to do with the exhaust side, not being able to fully remove all all the exhaust from the cylinder before the next cycle because of the backpressure caused by the turbo's exhaust side blades. Am I on the right track?
 
dmention7

dmention7

Hater
There is no simple answer really. There are a bunch of thermodynamic principles in play it a turbine/compressor system, and they are generally non-linear. By non-linear, I mean that changes to inputs do not produce proportional inputs to outputs.

In any case, this is getting aways off from AJ's thread, so you can make a new one if you want to discuss it further.
 
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spek1098

Guest
Ok, sorry...

[URL="http://www.mnmazda.com/forum/showthread.php?p=16497]Turbo Discussion - Trim, efficiency, Blade design, and other complicated crap [/URL]
 
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RockLobster

New Member
If you want to talk turbo II builds we should chat.

Basically it depends on a lot of factors. The weak point in the turbo II rx-7s is the stock fuel system. The injectors are too small for any thing more than stock power, the pump does not flow enough, the wiring is crappy. etc...

Also the stock computer cant handle that kind of power. You need a piggy back fuel computer or a standalone.

300rwhp will require a turbo upgrade. The stock turbo is not capable of providing anything much above 250rwhp reliably.

Turbo RX-7s are expensive and tempermental. If you set them up just right and take good care of them they provide phenominal power for a very long time. But if they are poorly set up, built, or tuned, you are in for an expensive time consuming world of hurt.

Also, all turbos used on 4-cyl cars are almost always WAY to small for a rotary... rotarys are fuel and air monsters, they drink fuel and gulp air at unbelivable rates....
 
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RockLobster

New Member
If you want a turn key 300rwhp turbo II and you can find the car, AND money is not too much of a factor.

Find the car, buy it, and bring it here. This is about the only compitent rotary tuner in the midwest.

www.a-spec.com
 
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