Try couple of things before u test the car again

1- take the car up to 270-280kmh so the ecu relearn
2- disconnect the battery for 20min

U will get max performance and u should feel the difference.

 

If the throttle response has now dulled slightly in normal mode then that needs reinstating with a re-map imo. By rights, a 100% successful mod should deliver an overall enhancement on all fronts without compromising such things as pedal feel or sensitivity. The smoother (im assuming less immediate from prior) throttle response you reportedly now have in Sports C again indicts the previous edginess/sensitivity has been adversely altered as a consequence of changing the turbos. So whilst the butt dyno feels an improvement in power the pedal feel has lost its eagerness as such? Desirably the pedal feel/sensitivity would remain same or, be sharper...more instant. Smoothness and linearity was always a key feature of the stock tune and part and parcel of a well sorted AM tune. Todd said he was able to alter the throttle response and pedal sensitivity in either mode to ones liking so maybe get that looked at eh?

Dave re the twitchy: Doesn't really change the SC/normal functionality in so far as the pedal is always edgier in SC than normal (as per Porsche's design) so if Todd re sets the pedal feel function those differences can be maintained or re-instated if one chooses. I'm sure the new turbos change the feel of the engine in a better way (if thats possible) but it's nice to have immediacy and, if in SC mode, if desired, have an even more edgier pedal feel too.

Agree totally...but how many times?

Yeh lol Asher but I'm still trying to find out how much $ so I guess at this rate it'll be 991tt by look of it.

Not a bad suggestion. Maybe a reset will re instate the throttle feel.

 

It will speed21

We ALWAYS do that on reflashed, modded vtgs, a30/gt30 cars

 

Then if i were Mr Boggy i'd be doing that immediately!! You never know it might even make it go a bit better too.

 

That will adapt the throttle quicker.

 

If I go up to 270-280km/hr then I'll be the one to relearn - to not bend over to pick up the soap in jail.

They did disconnect the battery as per their usual practice.

 

Paul, let me clarify. I PREFER it the way it is now. I didn't think it was optimal for my taste with just the tune. I just don't understand why it's different now with the tune and vtgs, I'll ask Todd. The throttle response with just the tune was a little edgy off throttle (when you stop accelerating and just coast).

I had an "off the shelf" tune before meaning that I never datalogged to customize it. I think that may be part of the reason why my times aren't as good as K24s or even Dave's (who has the same turbos). I'll datalog real soon and send it to Todd. It sounds like K24 is really happy with his latest version of the tune so I'll ask for something like that.

Bottom line is that even if nothing could be done about what I'm getting for data times right now I'd be happy with it b/c the throttle response is great and there's excellent thrust with these turbos. I think (and am going on memory) that the torque peak comes a few hundred rpm higher but the boost response comes on quicker and harder.

 

Sounds good! So i take you won't bother playing with the pedal sensitivity in the event you have Todd tweak the tune? I interpreted that you prefered the pedal feel in SC mode so perhaps an alteration to the normal mode is in order? Btw how is the new clutch holding up? Is it holding the additional power with ease? How would you rate the power increase in percentage over what you had?

 

aha

try to d/c the battery after several hard rans

 

So Boggy i read on the Proto tune thread where you say your turbo's have no extrude's? Extrudes? What is this exactly?
Can you please provide the full details regarding exactly what has been done to these new turbo units of yours that makes them better than the stock units? And, are yours the same as Dave's/Milou's, and if not where are the exact differences? Also what does one expect in terms of performance between the differences....if any? TIA.

 

What flash do you have? A decent flash and aftermarket exhaust is a significant upgrade over stock. And it should excite you long enough to fill the penny jar for the turbo upgrade.

 

Hi Paul,
the clutch is holding up fine (as expected). It's hard to put a percentage increase on it but from my experience today I'd say that the power in 4th gear doesn't let up all the way to redline. Definitely feels more powerful than just the tune alone. It is hard to compare directly based on just memory but the numbers don't tell the whole story.

My upgraded turbos are the same as Dave's which have a 63.5mm billet compressor wheel with a clipped turbine. Basically, the enlarged inducer increases the air flow while the clipped turbine offers a bit more power higher in the rpm range and theoretically increases the lag a little. Milou has the same turbos with the extrude process done to the hot side. The difference is that it holds the power higher into the rpm range if you look at the dyno graphs (I can't remember where I saw them). Iirc, the extrude process was good for about 0.3-0.5s reduction in 100-200km/hr time, and will lighten the wallet by an additional 1700 bucks or so.

 

Extrude honing is the process which Air Flow is increased by smoothing the metal surfaces or reshaping surfaces reducing air turbulence.

 

I figured the extrude had something to do with enlarging the exhaust passage of the turbo but wanted to know if the enlarging entailed a new casting or if it was a porting/polishing process on the existing casting. You mentioned the theoretical increase in lag....which is generally a bi-product of using a larger turbo, hence that change in throttle response you reported.

 

After living with it for a week Paul I'd have to say there is less lag now than with just the tune. The throttle response is very smooth and less twitchy and I prefer it this way. Just waiting for an updated tune from Todd.