DIY telemetry ... Re: [Diy_efi] tiny injection

Fri Jun 28 17:50:51 GMT 2002

I have to agree that this thread has taken an interesting direction.  I've 
decided to drop the forced induction idea for my rc car (which arrive 
yerterday by the way, I'll be tinkering away over the weekend for sure) and 
use my money to practice making telemetry systems.  I'm thinking of using 
the 8-bit transmitter from rentron (www.rentron.com) to start off with, but 
if any of you guys have any other suggestions, I'd love to hear them 
(especially if they can transmit larger than 8-bit packets, and are still 
cheap).  Also, if any of you guys could suggest a nice cheap microcontroller 
with built in a/d for the transmitter that would be nice too.  thanx

-santi

p.s.  I know a lot of the price inflation comes from companies having to 
invest money in order to get CARB certification.  But mostely, they charge 
more because they can, and people will always want to go faster.

From: "The Punisher" <punisher454 at hotmail.com>
>Reply-To: diy_efi at diy-efi.org
>To: diy_efi at diy-efi.org
>Subject: Re: [Diy_efi] tiny injection
>Date: Fri, 28 Jun 2002 09:29:13 +0000
>
>Whoa, hold on a minute. What I got started on here was building a 
>Centrifugal supercharger for a "tiny" engine. I was talking a few cubes. 
>That can be done with a vaccum cleaner impeller and custom housing real 
>inexpensive and simple. The plumbing could be done real straight forward 
>with the butterfly upstream of the impeller with NO bypass or anything like 
>that.
>
>A car setup is ALOT different. The other poster here seems to have alot of 
>experience in the R&D area of centrifugals, so he may be better qualified 
>for alot of this.
>I was just saying that doing a "tiny" engine didnt have to be done like a 
>late model EFI car like what MOST of these seem to be targeted at.
>I installed Vortech, ATI, Paxton/Novi systems on 4th gen F-body's(mostly 
>LT-1's). Most were inetrcooled(one brand likes to call it AFTERCOOLED) with 
>air-air(ATI) or water-air(Vortech). In all honesty I dont think they could 
>have done very much different with their basic kit designs considering the 
>design criteria these things had to meet. I'm talking about the plumbing of 
>the system, NOT the design of the blower itself.
>The engine compartments are TIGHT! the hose bends are TIGHT, The clearence 
>between the steering shaft and the "blower" inlet in some cases is REAL 
>CLOSE. The inlet hose has to make a 180 right at the blower and is a REAL 
>BITCH to put on in some cases. The hoses have a bad tendancy to slip or 
>blow off at the worst times.
>The T-REX "booster " pump idea dont work very well(I took 2 of them off on 
>the dyno because they werent making any difference). The belt's tend to 
>slip alot, or the tensioners fall apart(ATI). I asked if anybody used cog 
>belts and was told that there tended to be alot of alignment problems.
>But here's the thing, on THOSE cars I dont see how you could do it much 
>different given the space, and requirement to leave most of the stock 
>components alone.
>On something where you have alot of room and can position and plumb the 
>blower FIRST then place the accesories and evrything else AFTERWARDS you 
>could do alot better than those late model bolt on kits.
>
>I also happen to think that the "kits" are WAY WAY overpriced!! I wouldnt 
>bitch so much about the quality if I thought the quality matched the price. 
>But of course their typical customer is used to paying a fortune for the 
>parts on the late model "muscle cars".
>For example: On MY prefered type of "hot rod"(late 60's muscle cars) I have 
>been used to paying about $110-150 for an inexpensive seto of headers, or 
>about 250-300 for a REAL NICE set of headers. On a 4th gen F-body with an 
>LS-1 a good set of headders will set you back 600-900 bucks depending on 
>which kind(TTS are nice). They sure as hell aint made better than the 
>250-300 dollar classic muscle car headders I use.They dont leak less, they 
>dont flow better, they wouldnt make more HP on the dyno(with evrything else 
>equal), The exhaust sure dont bolt up easier, they dont have 2-3 times more 
>material in them to justify the price. Its all a bunch of marketing CRAP! 
>Try this, lookup the price for a cam from Comp cams for an LS-1, it'll be a 
>HYD roller. Now look the price for a HYD roller Comp Cam for a traditional 
>american V8. The LS-1 cam may cost over twice as much as the others, but do 
>you believe it costs twice as much to make?? HELL NO!! Sure maby the first 
>few batches while the tooling was being perfected(but most of it is done by 
>CNC anyhow).
>This is one of My biggest gripes I have with these latemodel centrifugal 
>supercharger kits. Its rediculous, but I guess as long as guys line up to 
>plop down their money they'll keep on sellin 'em.
>
>OKAY, FLAME AWAY!!! :)
>
>
>
>>From: "elcamino73" <elcamino73 at mindspring.com>
>>Reply-To: diy_efi at diy-efi.org
>>To: <diy_efi at diy-efi.org>
>>Subject: Re: [Diy_efi] tiny injection
>>Date: Wed, 26 Jun 2002 18:44:45 -0400
>>
>>You've got my attention. I have built a system from scratch and it is not
>>finished yet.
>>D1 Procharger, Accel single plane manifold, custom 4 barrel throttle body,
>>large air to air I/C and second I/C to be figured out yet.
>>Stop being so darn general and tell me what you don't like about "these
>>systems".
>>.
>>
>>Blown 407
>>ElCamino
>>
>>
>>
>>----- Original Message -----
>>From: "The Punisher" <punisher454 at hotmail.com>
>>To: <diy_efi at diy-efi.org>
>>Sent: Thursday, June 27, 2002 2:47 PM
>>Subject: Re: [Diy_efi] tiny injection
>>
>>
>> >
>> > THOSE systems are designed to be "bolt on's" without changing the
>> > intake/throttlebody/etc...
>> > They work okay for what they are, but there are ALOT of design 
>>compromises
>> > made so they can fit in the crowded engine compartments of late model 
>>EFI
>> > cars. The majority of their customers dont like to modify things. Based 
>>on
>> > the criteria they are designed to meet, they just dont have much choice 
>>in
>> > the design.
>> > But if you were designing something from scratch, and it didnt have to 
>>fit
>> > and look a certian way then there is alot of room for improvment.
>> >
>> >
>> >
>> > >From: "elcamino73" <elcamino73 at mindspring.com>
>> > >Reply-To: diy_efi at diy-efi.org
>> > >To: <diy_efi at diy-efi.org>
>> > >Subject: Re: [Diy_efi] tiny injection
>> > >Date: Mon, 24 Jun 2002 15:01:16 -0400
>> > >
>> > > > Full size car centrifugals like Vortech, ATI, Paxton/NOVI and the 
>>like
>> > > > expose the compressor to full atmospheric pressure at all times and
>>have
>> > >to
>> > > > have a "bypass" system open most of the time, This wastes energy
>>during
>> > > > normal driving(its done this way to make the kits "bolt on's").
>> > >
>> > >Is that to say that there is a better way to do this or is it just 
>>what
>> > >needs to
>> > >  be done by virtue of the design?
>> > >
>> > >
>> > >
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