Dyno Day Quiz!!!!

[jdbubb at verizon.net (Dan Bubb)]

Not like I'm any expert at all, but any MBC I've tried has had a boost spike. Actually more of an overboost hill before the boost is under control. There must be some sort of lag factor. Maybe installing the MBC right at the wastegate would reduce the spike.

I know some aftermarket engine management system have boost control through a PWM solenoid. They seem to be most effective when run open loop. Both the DTA and Megasquirt had overboost/spike issues when trying to run closed loop although they may have solved that by now.

You definitely need a remap. Richer than 10:1 is just way off the mark. Too bad you can't tune the thing yourself considering that you have a WO2.
Even at 205 Hp that's got to be a hoot in a lightweight MK I!

From: "Ben" <vwtype53@xxxxxxxxx>
To: "Dan Bubb" <jdbubb@xxxxxxxxxxx>; <roccit_53@xxxxxxxxxxxxxxxxxxxxxxx>
Cc: <scirocco-l@xxxxxxxxxxxx>
Sent: Monday, October 15, 2007 11:54 AM
Subject: Re: Dyno Day Quiz!!!!


> To be fair, I must confess that my most realistic pull was around 205.  My first two pulls were
> done with my MBC in play, and limiting boost to around 14psi max (holding around 12psi to
> redline), which helped eliminate surging.  My last pull I opened up the MBC and saw closer to
> 17psi max, which is what gave me a nasty looking hp curve, but the peakier 218hp number.
> 
> Oh, and the wideband o2 said that I was running WAY rich, especially in the mid-range.  We're
> talking off the scale, below 10, power-robbing rich.  Near redline it came back to around 11-12.
> 
> So, if I could just figure out how to get rid of the boost surge above 14psi, and then get a remap
> for my ecu... well, I think I could eek out a bit more.  :)
> 
> The dyno day was fun.  Maybe we'll do another one in the Springtime?
> 
> Ben
> 
> 
> --- Dan Bubb <jdbubb@xxxxxxxxxxx> wrote:
> 
>> So, 
>> Jason -10 for 217
>> Ben +44 for 218
>> Cathy +9 for 109.7 or thereabouts
>> Daun -3 for 61.5
>> and Tony -2 for 61
>> 
>> Well, not a bad day for any of you!
>> The 1.7 was only rated at 74 crank Hp so getting 61 to the road is pretty good.
>> Jason's numbers are pretty much in line with APR's claims. (yes, I cheated and looked to see how
>> much he should have!)
>> Ben's HP is awesome for a 1.8T that's only mildly tuned with approximately 250Hp at the crank!
>> And, of course, I'm awfully impressed that Cathy's getting 110 Hp out of a 1.8L 8V.
>> Most of the 2.0L 8V's that I'm aware of aren't getting more than 110 Hp unless they have a
>> professionally ported head and 272 cam or larger.
>> So, I guess that just goes to show that the stock ABA head/manifold outflows the JH
>> head/manifold and that removing the CIS intake restriction is a good move for more HP.
>> Course Timbo's recent 87 Hp out of a JH with dual outlet manifold and MS also points out the
>> advantage of removing the CIS restriction.
>> Dan
>>