[TECH] 3a dyno in and I am disappointed, sorta...

[jdbubb at ix.netcom.com (Dan Bubb)]

Personally, I thought you'd be 115-118 HP so this is a suprise!
There's really no way to compare my engine to yours because of the Haltech,
but I still have some input (don't I always!)
A week ago I was going to suggest you include A/F ratio in your runs, but I
see you have. There's a huge clue right there! Dead on 15:1 across the
board! CIS is awesome it can hold stoichometric so accurately!
Now, (this is Dan the Parent!) how many times did I give input on setting up
your CIS WOT switch???? If you're running at 15:1 then your switch isn't
triggering or there is some problem with the wiring or something. Your
engine is constantly running closed loop. With the switch it'd go open loop
and drop to mid 13:1 (I presume). Now we talked briefly about this at Cincy,
but the KS ignition WOT switch is not the CIS WOT switch and as far as I
know they don't have any interconnection, but whatever, your CIS WOT switch
is clearly not working or connected.
So, step one is get the frigging WOT switch wired and working. I bet that'd
give you 5-10 HP right there.
The next items that come to mind are:
1) head, the stock GTI head just isn't that high flow. You need a ported
head to start making big power with the 8V (one friggen smart crack from the
16V guys! Just one!). Not sure if a cam will do much without the head work.
My recollection (this is Dan the old fart speaking) when I was running a
stock head going to a bigger cam with the 2.0 just gutted the bottom end
without adding anything to the top. I have no objective data and the butt
dyno is a notorious lier, so take that as you wish.
2) cam. The G grind is a good mild cam. You want an 8V to make power you
need something that'll make your idle good and lumpy. 272, 280! They do hurt
the bottom end, but the 2.0 can loose some bottom end and still have
terrific off the line acceleration.
3)why the hell are you running a 16V KS box? A 16V isn't an 8V and the
ignition curve is undoubtedly different. Despite your mods I think you
should be running an 8V KS box. Just my opinion.
My exhaust, flywheel, fuel pumps, CR are the substantially the same as yours
and they support alot more HP so those aren't a big issue for upgrade.
Maybe I'll think of more later.
I bet you could work out the CIS WOT switch before you go to work tomorrow.
There's a noticable difference!
HTH!
Dan



----- Original Message -----
From: ATS - Patrick Bureau <txrocco@sbcglobal.net>
To: _Scirocco Mailing List <scirocco-l@scirocco.org>
Sent: Wednesday, October 01, 2003 4:01 PM
Subject: [TECH] 3a dyno in and I am disappointed, sorta...


> alright after all my work here is the results I got for my 8v....
>
> Best run 97.9HP @ 5200 RPM with 118.9 ft torque @ 3100 RPM, dwell set at
60'
> and timing at 14' idle, 28' @ 3000 rpm.
> Worst paladin7run 93.9HP @5200 RPM with 116.3FT torque @ 2800 RPM, dwell
set
> at 45' and timing at 8' idle, 23' @ 3000 rpm.
>
> Now I will list my mods to the engine so we can compare apples with apples
> and maybe someone can post me their setup and I can figure out where I am
> loosing/needing to concentrate my next series of mods/effort to gain more
> out of this 8v.
>
> 3a block, oem specs pistons, rebuild 7K miles ago
> JH head with no mods on it
> 4-2 manifold, 2-3 eurosport downpipe, to high-flow cat to 2" eurosport cat
> back.
> G grind Cam
> 8lbs flywheel
> scirocco 16v knock sensor and box (cis-lambda + knock)
> 16v air box intake
> OEM scirocco 85 fuel delivery pump and injectors.
>
> Things to consider;
>
> JH engine = 75HP(NET) @ 5500 RPM with 100 ft Torque @ 3000 RPM
> 3a engine = 108 (NET) @ 5300 RPM with 121 ft Torque @ 3200 RPM
>
> dyno link ->
> <http://www.longcoeur.com/scirocco/various/dyno/dyno%5Fatsgtx01%2EJPG>
>
> So basically I am in between them two engines... any thoughts ? and if you
> have a dyno image I would like to have them please...(with mods) so I know
> where to seek improvements
>
> ATS - Patrick Bureau - txrocco@sbcglobal.net
> ----------------------------------------------
> MSN:ATSGTX@hotmail.com |YAHOO:ATSGTX@yahoo.com
> ICQ:32918816           |AIM:Texasscirocco
> ----------------------------------------------
>
>
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