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Index > Engine/Drivetrain > Thread: To Boost or not to Boost.?There is no question.
Thread: To Boost or not to Boost.?There is no question.
repuguru


Redlining
Posts: 319
posted January 27, 2002 09:09 AM

To Boost or not to Boost.?There is no question.

Been looking all around the net for ways to make more power out of the ol' 13b.If you find all the little tricks and tweaks you can certainly enhance what you have but I really want to enhance x 10 maybe 12. Psi that is.
You guys need to check this unit out. www.electricsupercharger.com........I will wait for your response...
Klaus I'll get more info on the RX3 I was taking about pumping up the boost.
I am coming to the conclusion that a turbo might be more fesible than a Supercharger for my personal application. I am looking for a small unit that will spool quickly and max out not far above my personal goal of 10 psi..
If I chose to do a suck thru system I will be forced to leave out the intercooler. Easy
If I chose to do a blow thru I can use an intercooler but, I will be forced to set up a plumbing system for the boost. Turbo---->Intercooler---->Turbo Hat... (A turbo hat is a term for the intake pipe adapted to the carb.) Yes carb.. and that presents a whole set of other issues when you pressurize a carb.... Hard
Anyone interested in discussing any info they have. I am still researching the H2O injection. Maybe someone can help.

ne bright spot is that I am going to

       
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Klaus43


Rotorhead
Posts: 1259
posted January 28, 2002 01:07 AM

very cool!

Hmmmn...very intrigueing, this 'elecrtricsupercharger' idea.
LOOKS good; might actually be one of those gizmo's that adds up to a useful part in my "biggest, most reliable bang-fot-the-buck" scenario... but they say nothing of adaptation to carburetion. Of course, you, guru, speak of carb pressurization... So now whaddo I know?
(Not much by now--I'm dead tired...) Anyhow, you get my drift... most/most reliable results per dollar... say, what do you, or any of you, know about Mazda's experiments w./ a hydrogen burning rotary? The fuel cell deal is done.. go see powerballtechnologies.com ... that'd be my fuel of choice!
(There's a joke in here somewhere about playing ball...)
P.S.-- so where is it acceptable to yak about associated passions such as other pre-rx7 rotaries, ? kinda motorcycles, racing, etc.? If your local autocrossers have a 'sport truck' class, I can recommend it as a super way to play w./ your REPU... here anyway that class is unrestricted as to mods! But I digress... must sleep now. --K

       
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repuguru


Redlining
Posts: 319
posted January 28, 2002 06:29 AM

Yeah they don't mention the carb on the electricsupercharger page. I don't know if 1 psi of boost will make a significant enough of a pressue change that you would have to recalibrate your carb to compensate. And your on your own as far as adapting that unit in stream. $300 + isnt to bad for a supposed increas of 5% to 10%. Of course a $50 K&N filter has those results about. But I assume if you are like me you already have the K&N. Soooo.... on to the boost..
____________
77' REPU plus a few spare parts
for it.
85' GSL-SE
83' GSL

       
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Klaus43


Rotorhead
Posts: 1259
posted January 28, 2002 11:18 AM

Good morning!
Nope, don't have the K&N... in my own cheap way, I'm currently running what I've got: I selected from a.) stock housing w./ paper filter b.) stock housing w./ oiled foam element, and c.) aftermarket 'triangle-shaped' hot-rod style foam cage w./ oiled element...
I've got friends who say it wouldn't matter, really, on a japan-port motor anyway, but I chose to run the funky triangle filter for now... it seems to work just fine, tho I had to dink around w./ the base of the assembly back when I got that truck to make sure it sealed well...(it came to me with the REPU in question...I wouldn't have run out to buy one new.)
But back to BOOST: I'd like to get more edumacated on the breadth and depth of what exists for how much $$$$, and how what applies to our favorite form of powerplant, esp. in a street-driven performance-sport-truck application. Could y'all offer some info/advice or other source/stat links?
Granted, any boost option worth running, beyond perhaps that electric fan, will COST to do right... but what ARE our options, and what has the best track record? (Given that I'm not a huge fan of turbo's...if I were, I might answer myself with a mod-stock turbomotor, perhaps w./ a bigger turbo...)
:) ; K.

       
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repuguru


Redlining
Posts: 319
posted January 28, 2002 01:27 PM

There are so many variables you must address when considering a turbo or supercharger.
My concern of course is will my motor take it? Its a fresh B motor with early 13b 9:2:1 rotors. Which isn't far off of Mazdas own 9:0:1 turbo rotors from 89-92. They boosted those to 10psi stock with an intercooler and a management system. Neither of which I'll be using if I build this thing for any thing less than $2000. So I must seek other ways to ensure my motor doesn't grenade.. Like H2O injection. Which I still am finding out exactly how it will apply to my situation. When you force it to make power beyond its design you really have to be careful.
There are so many management systems, manifolds, turbos, intercoolers, etc.etc....... The RX7 forum is loaded with all kinds of information on what works and doesn't work for turbos and superchargers. www.rx7club.com You'll get lost in it...
I don't know how I am going to do it yet but the picture of how much its gonna cost is starting to come in focus...
THOUSANDS!!!!! I really haven't nailed down whether thats a 2 or 3 before that THOUSANDS!!!!! but non the less its gonna cost.

____________
77' REPU plus a few spare parts
for it.
85' GSL-SE
83' GSL

       
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iceburgslim


Newbie
Posts: 3
posted September 08, 2002 08:23 PM

...............

There is no way to get an electric motor big enough under the hood of any automobile that it could generate possitive intake mannifold pressure. Even if there was a motor small enough there isnt enough voltage to power such a device in a automotive electrical system. Search elsewhere for more power.

         
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volksnut


Newbie
Posts: 4
posted September 09, 2002 03:24 PM
Edited By: volksnut on 9 Sep 2002 15:25

well this is on the subject but a little different car but the same principal...I built a simple, cheap turbo system for my vw for ....$400. It is a pull through set-up with a turbo from the junkyard off a Dodge Daytona...all I can say after some carb tuning (a 40 year old Zenith carb) homemade boost controller($7) it's run a 12.3 at 102 in the 1/4 mile on 10 pounds boost...If you've got fab skills, mig welder, a little time and can lower the compression on that lil Mazda you can do it....oh my site is

http://www.thevolksnut.com




         
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wankel_dreams


Redlining
Posts: 293
posted September 09, 2002 06:04 PM

quote:
....and can lower the compression on that lil Mazda you can do it....



Easier said than done. The only way to lower the compression is to change the rotors. turbo rotors have a larger pocket and thus lower compression. I've also heard of people experimenting with modifying rotors and increasing the pocket size to lower compression, but can't think of hearing anybody have great success.

        Click here to visit wankel_dreams's homepage. 
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iceburgslim


Newbie
Posts: 3
posted September 09, 2002 06:54 PM

.................................

You could still turbo the motor without lowering the compression, but tuning will be much more critical. Race cars of all varieties use force induced high compression engines. Although you need your engine to last a little longer than a race cars will.......running high compression and boost just means that the window for tuning error is much smaller than a lower compression motor.

         
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RX3UTE


Newbie
bad ass
Posts: 10
posted October 15, 2002 09:25 PM

13B turbo

why not just get a 13B turbo engine from a 85 up RX7?you get injection,massive gains,easy 14psi.

i got my engine for $800 NZ bout $400US.
an engine/gearbox,computer/loom,is around $1400 NZ.
dont bother stuffing round with blowers,custom manifold etc...
the series 4 RX7 engine has the lowest rotary engine compression,but a series 5 engine has knock sensors and slightly higher compression,and lighter rotors,bigger turbo,ect.......plus all 13Bt come with top mounted intercooler that you can throw out front so you can close the bonnet.

if you want more info,let me know
____________
email me at rx3ute@yahoo.co.nz

         
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repuguru


Redlining
Posts: 319
posted October 16, 2002 04:13 PM

I am afraid its getting hard to find running Turbo rotaries from the 80's. They are out there no doubt. Our web master has one in his truck. But the one's I seem to find are blown.
$400 is a dream find for a 13bt.

       
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