LIL has full boost and full revs

[AndrewS]

ORIGINAL: Diver944
Thanks Andrew, it will be good to get out on track again with you again. I hope you'll be bringing the 307 as it gives us all a chance [] If you drive anything Porsche badged then no doubt you'll be lapping me at least once every session again

Hi Paul,

I'm now booked for the day at Bedford (Feb 24th). The 307 was chopped in for a Kia Sorento XT - so it won't be that one. I'll be there in my trusty 944 Turbo.

With all that torque, I'm sure you'll be able to hold your own without too much trouble ;-)


Regards,
Andrew

 

[MarkK]

Saw the Lil clip on Rennlist,liked that!![][]

 

[Diver944]

Oooooooh - look what I've been doing this morning []

........and I'll probably still be doing it by this evening [8|]

The mechanical stuff is nearly all fitted, next its the dreaded wiring - which I hate []

Should be good when it's done though.

 

[Peter Empson]

Looks great Paul!
Can't wait to hear how you get on with it.
best regards,
Peter

 

[MarkK]

Nice![] Are you going to the Ace??CONVOY!!

 

[Peter Empson]

ORIGINAL: MarkK

Nice![] Are you going to the Ace??CONVOY!!

Thanks for the reminder, I'd forgotten that was on this Monday. Will try to make it along to if I get a chance. How early does everyone normally get there?
best regards,
Peter.

 

[MarkK]

I thought it was wednesday!!??What day is it? long way to make a mistake!!!![]

 

[sawood12]

Lookin' good Paul. I'm just curious as to how the Vitesse system slots in with your turbo that is non-vittesse supplied. Did the chap from Vitesse have to burn you an interim map to get you started until you get to customise the map yourself, or does the piggy-back computer completely bypass the standard DME so you can programme the map yourself?

 

[Peter Empson]

ORIGINAL: MarkK

I thought it was wednesday!!??What day is it? long way to make a mistake!!!![]

Just checked their site, it seems that German night is the last Monday of the month, whereas Porsche night is on Wednesday. So sorry for the confusion, I might struggle to make Wednesday [&o] but will see what I can do.
Best regards,
Peter

 

[944Turbo]

The piggyback allows alterations to the fuelling and the ignition (though I believe John disables the ignition unless you ask to stop you from grenading the engine). He will create a chip that is close but you can then use the piggyback to fine tune. The vittesse MAF is set up to measure airflow all the way through the rev range - unlike the standard AFM which is maxed out at around 4000 rpm and then relies on the map.

I have the MAF but not the piggyback and am running rich, however I also have a boost leak which isnt helping the Maf measures the incoming air then some escapes meaning too much fuel gets injected.

Good luck Paul!

Tony

 

[Diver944]

Vitesse has experience with 3.0L 8v cars already so he believes the base map provided for the 3.2 will be within 95% of where we need to be regards fueling and timing. The piggyback has been described as one step down from a standalone system and does allow an awful lot of logging and then alteration of the parameters to fine tune the car exactly.

Looking at all the wiring interfaces in to the DME I'm going to leave the piggyback off until the car is next down to Jons, because I simply don't think I have the capabilities to install it. I had the MAF itself fully installed today but was missing a hose to connect in the dump valve to the new SS J tube. Despite trying all the motor factors within Northampton I can't quite get something to connect it so I have deinstalled everything as I absolutely have to use the car tomorrow to collect a customers car for repair at home [8|]

A second 90 degree elbow like the standard Porsche one on top of the dump valve will probably be ideal, so if anyone has one I'd be grateful or it's time to hit the phone to Exeter on Monday.

MarkK, a convoy on Wednesday sounds good to me, we could maybe meet at Newport Pagnell services at around 6pm?

 

[sawood12]

So how does the MAF work without the piggyback to process the signal into the ECU - is it similar to the Scivision MAF that emulates the AFM signal?

 

[MarkK]

6pm Newport pagnell sounds good!How far is it?Looking forward to that!!!

 

[Diver944]

Yay - Jon has already found a solution for my Dump valve fitment and if I get time tomorrow I shall reinstall it. In the meantime I took advantage of teh spare time to polish up the stainless steel J-pipe so it looks little more blingy:

Scott, the small white box on top of the MAF unit is the processor that sends the correct signal to the standard DME. A Vitesse chip goes in the DME and controls the fuel and timing. When the piggyback is installed, a second processor box is wired in to the DME itself and gives much more advanced functionailty. As well as fueling, timing and data logging, it can (if you want to) control water injection, boost control and even Nitrous []

 

[DivineE]

Lookd nice[] I want one! How was the wiring for the MAF? I know you were a tad edgy about doing it!

Ben

 

[944Turbo]

ORIGINAL: sawood12

So how does the MAF work without the piggyback to process the signal into the ECU - is it similar to the Scivision MAF that emulates the AFM signal?

The chip board supplied in the maf kit replaces the chip in the ecu and expects the full range of maf signal, so it does not need to emulate the AFM signal.

The Scivision approach is to replicate the AFM signal, and rely on preset values in the chip once the AFM maxed point has been reached. The MAF behaves like an AFM without the barn door.

Tony

 

[sawood12]

Yes, that's my reservation about the Scivision MAF - I can't see how above that 4krpm range how it can do anything but revert back to a map because it emulates the AFM signal. I notice that Vitesse do a Scivision-like stealth plug and play MAF solution which sounds like it might be a good product - and they are currently on sale!!

 

[Diver944]

Success!!! []

Following Jons advice I managed to get it all re-installed in about 90 minutes (As opposed to yesterdays 5 hour failure [8|]), then a further hour connecting up the electrics and installing the Vitesse chip in the DME. The moment of truth arrived and she started up straightaway and settled to a smooth idle at 800rpm, then I noticed I was extremely lean []

Doh! I hadn't fitted the 3 bar FPR [8|]

Once that was fitted, a quick test drive was very much a pleasure and it revealed that boost had increased from 15psi to 17psi, and it was holding it to the redline - no dropoff [] I adjusted it back down to 15 psi, and in the week I'll capture some comparative data plots to compare with my AFM readings at 15psi

Next I have to sort out some time to take her back to Jons so he can install the piggyback (that scares the life out of me with wiring) then we can properly fine tune it.

 

[Indi9xx]

Great news Paul!

As expected, we were hitting our head against the theoretical limits of the barn door flow restriction in just the way we had predicted.

Also intake air temps will now have dropped quite massively as the turbo isnt working as hard to maintain the same boost level... This reduction in intake temps on its own will be improving power, not to mention the removal of that restriction or the improved mapping.

Is the boost comming on any sooner, or at the same point? or possibly later?

On your next dyno run, I would expect to see the same or slightly more torque, along with most importantly for your car, much higher BHP figures! Ye Porsche gods only know what figures you will see... All I know is they will be bigger than you have seen so far, but also in a much safer way!

I am also quite happy that our intercooler is obviously up to the job of flowing enough air for the 3.2, which means its certainly up to the job of a 2.5 modified turbo.

Dont worry, if you dont like the rice rocket noises and sounds, we can delete them... Getting rid of induction noise without reducing flow or power is much easier than finding and making power!

Well done Paul!

 

[333pg333]

Hi Jon, I too would be interested on eliminating much of the Tokyo Drift sound if possible. I will have the same setup as Paul as far as the MAF from John V, (+ 3.0L and large turbo). The noises are fun for about 5 mins and then they get a bit trying. From what I remember you and Paul are keeping all the stock top end. Do you think by going up in i/c pipes / throttle body from 2.25" to 3.25" will have any bearing on these sounds?
Patrick