just hearing u guys talk about testing on the track and these classes and meets really gets me going i have MORE questoins

you guys mention tuning on tracks and such...how much does that track time cost?! and what not...ima have to start off small and what not i know PLUS there arent many tracks in my area so ima have to move....but its incredible hearing u guys talk about all this....reallly

thanx for you time..

 

NASA is about ~$270 here in Texas. DE's are as low as $220 and as high as $300. This is all for a 2-day event with varying amounts of track time.

It's really hard to tune on track... much easier with an eddy current dyno that can put a load on it like one from DynoDynamics. If you're in need of tuning I happen to know the guy that sells these things here in Texas, who also does tuning on the side.

 

I think he means tuning as setting up the car and fixing problems for the track, not tuning the ECU. When you start racing all sorts of problems pop up that you never knew existed.

 

Correct(mostly) For me, I am speaking of car set-up, and finding the 'weakest link" as I gradually turn up the power. Each time I push the car harder, something usually breaks, I fix it, run the car a couple time,and turn it up a little more. I can easily tune my ECU at the track, but data logging at the apppropriate time is tough, and I cannot DL for 20 minutes, in a fashion that has utility. I can however, lean out fuel for instance. I noticed that although my AFRs were ~11.0-11.5 on the dyno, that they were 10.5:1 on the track at WOT. Once I confirm my WBO2 is correct(by using a second borrowed one, I will be making on track adjustments to get those numbers a little leaner. This is actually for fuel economy as much as anything, as I am sucking the gas right now . Carl

 

Gotcha.

I've noticed different AFR on track... my guess is because you have a lot more air movement on track than on the dyno (but what the hell do I know, anyway).

 

Actually the primary cause if different loading, ie the dynojet rollers weigh ~4500lbs(IIRC), my car weighs ~2650. thus less load on the track. That said, why it would be richer I will have to ask around. That is why a DynaPck, or similar dyno is better for tuning than a dynojet. Also, on a dynojet, when you let off the rollers are still spinning at a pretty good clip, where on a load based dyno(as opposed to inertial type) I believe the dyno can be set up to simulate the deceleration of the car on the street. Carl

 

so u can tune a street car in theory to be more fuel economic (with major powerlosses?) and then to be superiorly powerful and a balanced loadout for longer distance races? how feaseable is this therory with an haltech e6x and a laptop?

 

A good tuner can get better fuel economy, and better power than stock with a small to mid size single. Carl

 

ChrisTaylor, So in spec7 racing you run your stock fb? Did you remove int., rat's nest, modify your stock carb? What if any mods did you make because I love the FBs and I wanna do some competitive racing but nothing off the wall.

Fred