[Diy_efi] traction control & nitrous (devlish combo?)

[Bill Washington]

Scott,
    I think, as has been suggested by others, the risk would be too 
great to contemplate trying your original proposal, however a couple of 
general questions about your original proposal:
1.    With the main fuel (injector) turned off roughly how much nitrous 
would be in the cylinder?
2. I ask the question because depending on the nitrous/air ratio it may 
be damaging (lean), very dangerous (explosive mix), or safe (too lean to 
support sustained combustion).

3. the suggestion of cutting off the nitrous with or before cutting 
injector(s) may still leave sufficient nitrous in the manifold to cause 
the same potential problems.

Good luck
Bill W

>Date: Wed, 26 Feb 2003 09:05:41 -0500
From: "Scott F. Williams" <sfwilliams at comcast.net>
>To: List for general do-it-yourself EFI talk <diy_efi at diy-efi.org>
>Subject: RE: [Diy_efi] traction control & nitrous (devlish combo?)
>Message-ID: <NFBBIFEIOLEKBIKOONPOMEPLHDAB.sfwilliams at comcast.net>
>In-Reply-To: <20030225232041.A22423 at scarab.apsoft.com>
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>  
>
>>> Seems to me that you are going at a problem in a backwards
>>> way. I would assume that the TCS is required even for
>>> non-nitrous operation?
>>    
>>
> No, this is merely an add on to a well-functioning car. There is 
> plenty of power to turn the tires into smoke at launch, but judicious 
> applications of the throttle minimizes that problem.
>
>>> If the engine has enough power to break the tires loose without
>>> nitrous, then adding nitrous is a waste.
>>    
>>
> Any respectable performance car should be able to break the tires 
> loose at launch, methinks. :^) At this point, I have around 200hp all 
> motor. With the nitrous, I'll add another 75 or so. That extra power 
> will certainly overwhelm the tires at low speeds, so I won't even 
> engage the nitrous until well into second or third gear. Additionally, 
> I envision this traction control system to be more of an aid while 
> cornering during backroad driving. To make it work with the nitrous 
> (an apparent fantasy at this point) would really be an added bonus.
>
>>> Does the Racelogic system have a "staged" configuration option?
>>    
>>
> The system is plenty capable of handling boost because the 
> supplementary fueling is handled by the main injectors. The same would 
> be the case for a dry nitrous system which uses the main injectors 
> instead of independent foggers like mine. Therefore, there's no need 
> for a staged set up when used in this manner. It just doesn't help me 
> in this case.
>
>>> I would expect the unit to have an enable line that could be tied
>>> to the nitrous arm.
>>    
>>
> I'm not sure what you mean by an "enable line". Do you mean an 
> auxillary output to control a secondary function (such as this)? Now 
> that I've gotten some more advice and have thought about it a while, I 
> think that controlling the nitrous/fuel solenoids directly will be 
> problematic. Their cycle time is lots slower than the main fuel 
> injectors. Thus, precise and smooth control of that system is likely 
> to be impossible. I'm quite sure that at this point, I'll use the 
> traction control for use without the nitrous. That seems 
> counter-productive, but launch (with or without nitrous) is really the 
> trickiest part of a dragrace. I can certainly handle the power 
> modulation on my own when I'm down the track a bit.
>
>>> BTW, is the car you plan on using it on AWD?
>>    
>>
> No, this is a FWD Volkswagen, actually. -a 1980 Scirocco to be exact. 
> :^) Anyway, that you *very* much for the advice! -- Scott F. Williams 
> NJ Scirocco nut '99 Subaru Impreza 2.5 RS Mazda 323 GTX turbo 
> "assaulted" vehicle Golf GTI 16v "rollycar" ClubVAC: "Roads found. 
> Drivers wanted."
>
>  
>



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