OK a few questions for the HP tuners people out there. But first directly from the SCCA rule book, how would you interpret this rule?

"Boost changes indirectly resulting from allowed modifications are permissible,
but directly altering or modifying the boost or turbo controls,
either mechanically or electronically, is strictly prohibited."

In you opinion is adjusting DALs "directly" adjusting boost? Isn't the learn down tied to the torque tables so, even if you just messed with timing and not boost it would relearn right?

Then, I need a track tune and do about 15-20 autocross events a year and usually about 3 track days and need a safe tune. There is a performance shop near me that does great work and lots of tuning experience but has never tuned an LNF. I need something that is gonna be reliable on track in 95+ degree heat. Should I trust them for a mild tune or go to one of the experienced guys on here?

Sorry for the noob tuning questions. Thanks for your input!

 

not an hp tuners guy but....if u get hp tuned ur computer will not relearn and not adjust things back to stock, second, go with guys on here rather than people who have never delt with lnf, guys on here know what they are doing, as the tuning shop since they have never tuned lnf probably do not.

 

why not email scca and ask, they can interpret it and not second guess yourself by other peoples interpretation. your hearing it directly from the horses mouth per say.

 

Try telling them it is a GMS1 tune. The GMS1 will get you up to like 22 PSI sometimes (depending on elevation and other stuff). Since that is a "Factory" performance tune it might be allowable.

 

Good idea but I would hate for them to say no just cause they don't understand how our ecm works. And the gms1 isn't allowed cause its a dealer installed option not a factory.

 

Just phone and ask and also argue that it's a warranty approved modification that takes off the retarding of power.

 

Already been discussed, GMS1 is a no go for sure. It would be like adding a TRD supercharger and calling it stock. Even if I could I would rather HPT. It can be safer and with a smoother curve.

 

well up to 20psi is normal for stock lnf's. you can have someone tune you to that with hpt

 

The stock tune is pretty close to the limits for a autocross tune. GM did a good job on it but there are always room for improvments

 

Yes you can't do it as per the rules or it'll bump you up a class.

 

What limits are you refering to? As of right now traction isn't a problem and I think you could go pretty agresive for a dsp tune my limiting factor for autox would be how far you want to interpret the stx rules. But, 25 minute sessions in nearly 100 degrees with no way for me to monitor KR.

 

you could adjust the timing and cam tables in HPT to allow for much more power on the stock DAL's. Also if you have E85 nearby, trifecta is now tuning for E85. E85 on stock boost levels with the timing adjusted along with the MAF corrections and fuel fixes will make some nice power too.

 

jboogie now you've got me worried about running around in tuned mode when I auto-x. I did it all last season, I have a conservative TF tune and I did some logs while autocrossing and sent them to Vince at which point he said everything is running great.

As for your original question the way I'd interpret is that you can't touch how the ECU controls boost either so a tune for you is out of the question. But I'm far from an expert on mods in SCCA.

 

i dont see how if GMS1 is not allowed, changing the dals around is DEF not allowed.

I dont know what class your running, so ill ask if changing your timing is legal.

What I think they mean by boost being affected indirectly by allowed modifications would be like, your intake and or Downpipe being opened up allowing it to boost faster, not neccessarily higher. Changing anything in the ecu to get more boost would seem like a direct electronic modification that is clearly (to me) not allowed by the rule you posted.

 

Timing advance is allowed, atleast it was in the SPEC Miata class.

 

ya with sunbelt motors, and the motor is still all stock. I wonder how the rules (if they are) are any different with forced induction motors. Also, the timing is a mechanical change on that, dunno if they would allow for a messing with the ecu to do it, and or would have the appropriate ways of being able to tell WHAT you changed, and just disallow it because they see SOMETHING is changed.

 

So, the general census is that a full tune is not allowed. That is kinda how I was leaning but, I guess the competitive side of me was hoping otherwise. Kinda pisses me of the STI/EVO guys run trick downpipes to allow boost creep and gain nearly 30hp that way, I know STOCK class guys that run GMS1 and think it's legal. Part of me wanted to say screw it our cars can boost 21psi stock so why can't I mess with when that boost comes it. I just know it would bother me to stretch the rule that far.

Now i'm wondering how much power could be gained legally and how it would be done. How could you take advantage of allowed intake and exhast mods without messing with DALs??

Oh and I run STX BTW.

 

really how are they going to know? trifecta switchable tune is an easy way to conceal it as well

 

that would make me a cheat, no thanks.

 

I hate how wishy washy SCCA rules can be. The way I take it is you can't touch your boost. As for road racing talk to Wangspeed about how to have your car setup for road racing. From what I have heard him say is that the stock tunes are plenty good enough for track days.

 

So, I can adjust Max Airload Torque Table, AFR,Max Torque vs RPM vs Gear, the timing tables, maybe the advanced guys can mess with cam timing to smooth it all out and the stock boost levels will not be altered?? Would the power improvements be worth it?

 

dont forget the cam tables

 

what kind of gains are people seeing there? I thought it was more for smoothing out the curve?

 

it is more for smoothing, but a smoother curve makes for better passes

 

Off topic

I forgot just how awesome your headlights are. Sex

/Off topic