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GTM Performance Engineering Stage 1 Turn key Supercharger kit In house Installation.

Originally Posted by Jordo! Meaning no one can even tune the maps or they can edit the values but have no idea what they are doing...? If the former, that's

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Old 06-11-2010, 10:18 PM   #166 (permalink)
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Originally Posted by Jordo! View Post
Meaning no one can even tune the maps or they can edit the values but have no idea what they are doing...?

If the former, that's going to make FI a PITA to tune...


The cams aren't even controlled by the same ECU as the engine. VVEL has its very own "ECU" that gets a single can bus data line from the engine ECU, then makes the adjustments to the cam duration and lift based on that data. It makes things a bit more complicated that just some editing on the tuning program everyone is using.

Now for the real questions ... how many anniversaries does Shumby have ahead of him before his wife will finally let this go?

good luck on both accounts

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Old 06-11-2010, 11:24 PM   #167 (permalink)
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^^^ lol


thanks for adding that info. Good to hear it from someone in the know.
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Old 06-12-2010, 12:49 AM   #168 (permalink)
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Quote:
Originally Posted by fstrnldr View Post
The cams aren't even controlled by the same ECU as the engine. VVEL has its very own "ECU" that gets a single can bus data line from the engine ECU, then makes the adjustments to the cam duration and lift based on that data. It makes things a bit more complicated that just some editing on the tuning program everyone is using.

Now for the real questions ... how many anniversaries does Shumby have ahead of him before his wife will finally let this go?

good luck on both accounts
Really??? Huh... I had no idea. Still learning...
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Old 06-12-2010, 09:43 AM   #169 (permalink)
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The GTM kit is untunable?
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Old 06-12-2010, 10:16 AM   #170 (permalink)
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The GTM kit is untunable?
where did you come up with that idea?
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Old 06-12-2010, 10:27 AM   #171 (permalink)
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Man this really sucks, sure you'll still make a lot of power with stock cats and headers but everything comes down to the tune. If the tuning is limited it will have a snowball effect. I applaud you guys for being the pioneer and still making good #'s, if anything its a prequel on what the Z is really capable of. However I'm going to hold off on any intake mods other than drop in filters or power adders until VVEL is cracked. Unfortunately many tuners/manufacturers are pre occupied with making $ through basic bolt ons and INITIAL F.I. kits, looks like the one who remains patient may have a lot to gain.
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Old 06-12-2010, 10:28 AM   #172 (permalink)
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Originally Posted by MMC Racing View Post
The GTM kit is untunable?

Are you just writing random thoughts that come to your brain or are you logically thinking at all?
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Old 06-12-2010, 10:30 AM   #173 (permalink)
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This is what I got from Uprev yesterday when I brought up VVEL again.

Quote:
From what we see on the earlier motors the cam phasing alone is just about perfect from the factory. You can adjust them all day and you gain 1-2hp. With the VVEL we have no less of an expectation. So realistically no one is moving forward on the development of the software because the potential gains will be very small, and the liability is huge. Also there are exactly ZERO hardware pieces in development in the aftermarket. So no replacement pieces or items that would require a change in the tuning itself.
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Old 06-12-2010, 10:51 AM   #174 (permalink)
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Their reply makes sense. I mean the VVEL allows for perfect and continuously variable cam timing all throughout the powerband so "cracking" it would be useless. If the LTH's are not allowing backpressure to be produced then I wouldn't really blame F.I or GTM for this issue. I'm willing to bet Stillen will run into the same issue if they attempt to tune their kit with LTH's and CBE pre-installed.

Maybe some catted LTH's would allow for some backpressure build up and thus retain pressure in the chamber? I guess someone will need to test this out and see if any gains are made versus stock headers and test pipes combo.
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Old 06-12-2010, 11:31 AM   #175 (permalink)
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Great info theDreamer +1 rep.

So now we need to knock on some cam manufactures door.

Shumby your in good hands. I'm sure you'll have a big smile on your trip back home.

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Old 06-12-2010, 11:37 AM   #176 (permalink)
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If the GTM SC kit is having problems with a LTH with no cats and not building boost ......... is there going to be a problem with running stock headers and aftermarket HFC's and a larger diameter CBE? I do believe that Stillen and GTM have tested their SC kits on stock cats and a larger CBE and have shown good results. But I don't believe they have completed any tests with aftermarket HFC's.

This is going to be a interesting read on what the outcome is going to be for both GTM's and Stillen's SC kits. I hope that the final outcome isn't that we all have to have stock HFC's and stock headers to have a SC kit ..... that wouldn't be nice and in my mind it would prevent some serious gains with a free flowing exhaust and HFC's. Plus, with the extra fuel/air from the SC boosted intake flow, the stock cats would eventually burn out or worse; plug off from the extra exhaust gases. I basically don't have much faith or generally like the performance of a stock catalytic converter in a stock or forced induction situation.

GTM and Stillen have some serious testing to do answer those questions and I'm awaiting to see the results.
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Old 06-12-2010, 11:40 AM   #177 (permalink)
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Quote:
Originally Posted by theDreamer View Post

Are you just writing random thoughts that come to your brain or are you logically thinking at all?
This forum is so on edge over these supercharger kits, it was meant to raise some blood pressures... I know it isn't true.
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Old 06-12-2010, 11:55 AM   #178 (permalink)
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Ill take an extra 150 whp on stock headers and cats all day long with a SC.
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Old 06-12-2010, 11:59 AM   #179 (permalink)
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me too at this point. however i do not think HFC will be an issues but RCZ will be the test pig on that one
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Originally Posted by SAM@GTM
Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living .
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Old 06-12-2010, 01:05 PM   #180 (permalink)
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ah much happier today. woot
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Originally Posted by SAM@GTM
Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living .
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