turbo and WOT injector/K24 vs K26

[Kaklikian, Gary]

Todd,

My boost threshold is really ~2500rpm.  My point about pulling from 1800rpm
in 4th was just to illustrate the torque of the motor, but there's no boost
at that rpm. Between 2500-3000, I get 3-5psi boost and acceleration is
decent, but it's  3000-3500 where the boost really starts to build. With the
short gearing of the 4000Q, spool-up is not really an issue, as I rarely
drive the car under 3000rpm anyway. The power range is really 3500-6000rpm.
Even at 70mph in 5th gear (3500 rpm), throttle response is immediate and
there is no need to downshift to pass. What I really need is a 6th gear.
 
With the Profec boost controller, boost builds quickly, but I still don't
get full boost  until the higher gears when the motor is really under load..
If I set the high boost to say 17psi, I will get only 15psi in 1st-3rd, but
17psi in 4th & 5th. And the turbo will hold the 17psi as long as I stay on
it.  Attempting this with a K24 on a 10vt will produce a lot of heat but no
power.  

Yes, my original K24 was better immediately off-the-line, say from 0-15mph,
but who cares?  As you said elsewhere, though, the K24 works like a charm on
a relatively stock or chipped 5000TQ. 

Also, I don't understand how the K24 works at the boost levels people are
running on UrS4's with K24's. Granted there is a big difference in cylinder
head, intake and exhaust manifold design between the 10vt and 20vt,  but
what about compressor efficiency, pressure ratios, etc of the K24? On my 92,
which is pretty much stock except for a Hoppen stage 1 chip, the boost peaks
at ~21psi and then drops quickly to ~16psi. I know this only from the boost
gauge, as the power is not really very impressive (could be the 2+ tons).
Still, I worry that the K24 is going to overspin and self-destruct at these
boost levels at 5000ft. 

Gary Kaklikian
86 4kcstq
92 S4

> ----------
> From: 	Todd Phenneger[SMTP:tquattroguy at yahoo.com]
> Sent: 	Saturday, August 26, 2000 8:05 PM
> To: 	Kaklikian, Gary; 'qlist'; 'Buchholz, Steven'
> Subject: 	RE: turbo and WOT injector
> 
> Great post Gary,
> 
>    Thanks for your opinions.  I for one appreciate it.  Curious though,
> with my High Compression motor I start building Boost at 2,000 RPM with a
> k26.  BUT, its the small Exhaust k26 fromt he KH motor and it supposedly
> spools a bit quicker.  Do you get any boost below 2,500 in say, 3rd or
> 4th-gear starting from 1,800 RPM??
> 
> thanks
> 
>   TOdd
> 
> 
>   
> 
> 
>   "Kaklikian, Gary" <Gary.Kaklikian at compaq.com> wrote: 
> 
> 
> 	I thought it was time I enter this discussion. First, the
> disclaimers:
> 	I am definitely not an expert on the 10vt
> 	Most of the work on my car was done by an experienced Audi tuner
> 	And, yes, I've spent more money on this damn car than I ever
> imagined
> 
> 	Gary Kaklikian
> 	86 4kcstq
> 	86 92 S4
> 
> 
> 
> 	> ----------
> 	> From: Buchholz, Steven[SMTP:Steven.Buchholz at kla-tencor.com]
> 	> Sent: Friday, August 25, 2000 1:07 PM
> 	> To: 'qlist'
> 	> Subject: RE: turbo and WOT injector
> 	> 
> 	> ... it seems to me that this is precisely what we are trying to do
> ...
> 	> assuming that the rear cylinders are running lean as compared to
> those in
> 	> front ... remember that we are augmenting the fuel provided by the
> CIS ...
> 	> this isn't a lot of extra fuel, just enough to richen up the
> engine when
> 	> running under high boost ... and providing a bit! more to the
> rearmost
> 	> cylinders than the front ones ...
> 	> 
> 	> Steve Buchholz
> 	> San Jose, CA (USA)
> 	> > 
> 	> > Isn't the problem reversed with the single injector? Fuel is
> heavier
> 	> than
> 	> > air and that would tend to make it richer in the rear cyl's if
> the fuel
> 	> is
> 	> > in the airstream at/near the TB.
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> 
> 
> Todd Phenneger
> 83' ur-q (aw! aiting a 20vt)
> 84' 4ktq fun but I'm sick of CIS.
> 
> 
> 
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