Al, I tried the launch control in the wet a couple times today. The first time I did it things seemed fine(other than burned clutch, ), the second time the car almost stalled when I took off and it stumbled like it lost power almost stopped running. Is it something I did, or did something mess up? My kids said it was shooting flames and ran for cover, which I think is funny and normal for a launch control. Is there a limit to how long to hold the launch?

Thanks

 

I think you just did it wrong each time. The burned clutch tries were letting out the clutch too slowly and riding it. The bogged attempt was dumping the clutch too quickly and not having enough power to even spin the tires, which is strange in the wet.

Don't hold it on the limiter too long...that isn't a good idea. Get it up there and launch.

 

It was an interesting example of the accuracy of road tuning

This car was tuned a year and a half ago when it was owned by another Evo member


It went a best of 11.9 on race gas with a custom dual stage flash - road tuned

Today the customer was scheduled for a custom tune - same mods but he wanted to have the car re-tuned

When the car reached the dyno both Mr. Buschur and myself concured that the tune was dead on perfect and that no adjustments would be needed

Its hard to turn down money for tuining but with a car already 100% perfect its hard to justify going through the motions for no results.

 

I was the 330hp/tq on 97 octane

I just filled the tank up and figured out what octane mix was.

I did like 289/285 on pump gas which was kinda disappointing but the powerband looks very nice.. can't wait til the roads clear and I get a chance to drive it!

Needless to say I'm going to do alky so I can get over 300hp on pump gas.

All in all I'm VERY happy and had a great time (except for installing injectors in a blizzard). I feel for anyone who drove home last night.. we ended up staying in ashland,oh

PS: Al I forgot to have you put the 2step launch on my tune Is there anyway I could mail this in and get it added? (maybe there is a chance I do have it but i'm not sure how to check)

 

/\ I believe that Al adds the 2-step to every one of his flashes now...test it out and see if you have it because you should...

 

I'll give it a try I'll post more info when I get home.. the wireless in the hotel sux ***.

 

So, by going from the 9.8 stock turbo to the 20G-9, you lost 11 whp on pump gas on the Buschur mustang dyno?

Is there any suspicion that you might have a mechanical problem, or did Al and others think your numbers were okay?

 

From a dead stop put the car in first gear hold the clutch in and put the foot on the gas to about 6k you will know if you have the 2-step if it starts building boost and everything.

 

On the bogged attempt, it did spin the tires and it acted like it lost power and just slowed down. It was like the car just didn't have any get up and go and was sputtering for a few seconds and cutting out. After a few seconds later, the car seemed to run fine. Scared me, because I thought I blew my motor(which was not the case). Just very strange to me. I know how to launch, but never have I ever dared launch my Evo at 6000 RPM's as I was always worried about breaking something. I guess I will have to practice with my new launch control.

How long is the max you can hold the launch control for and what will happen if you go over that time?

Thanks for your help Warr.

 

That is not accurate assertion

The last time I was at Buschur they were using a menthod to tune measuring the speed by gear by holding the car at 30 mph to calibrate the dyno. This time they are using a tach signal. I feel the newer method reads even lower.


The "peak" whp number is not very revlevant. It does not make for a fast street car nor does it make a smooth car.

I have noticed that the IX 20G is able to hold the TQ curve out twice as long and the power curve is usually nearly a flat line from 5500 - 7000 - no drop off at all

When tuning on pump gas - my goal is not to develop the most possible whp on the dyno that can be obtained. Although many tuners do this, it makes for a tune which is unsafe on the road and usually pulls timing when you pick up a lesser quality fuel at the tank.

This particular car was tuned well and it was very safe and conservative. There was no intentionm to maximize the whp figures.

BTW- while we were dynoing it was pouring rain which can alter the power delivery by up to 15 whp through the high humidity vs. a dry day. I bellieve the Buschur figures are uncorrected

 

Thanks AL. To be honest I really could care less about the numbers The #'s on 97 octane were VERY impressive!

 

Well we have some differences. I only have 264 cams he had 280's. I believe his was probably AEM tuned which means he probably has a nicer boost curve I would imagine. I'm not sure what else...

It's very possible weather played a factor in the lower #'s but I'm not really sure. The car pulls a lot harder on pump than it did with the stock turbo on race gas I do know that.

I also know I'd rather have a safe tune than put down the numbers that look pretty on paper but it sucks having to explain yourself to everyone who is interested in your peak numbers :P

I have yet to try out a race gas mix on the street as Wakeman to Ashland was snow cover and blizzard like conditions.. but I tried the launch control stuff out earlier and it kicks ***.

EDIT: Was there a mechanical problem I can't say I'm 100% certain. I would like to get a compression check done for starters. I do not think I had a boost leak but if there was it had to be very little as I used tbolts everywhere. I will inspect the car this week but I've had no major problems with it since my last tune.

 

Hey Al do all your flashes now come standard with the launch control just wondering cause I got flashed this past weekend with you guys and someone up above mentioned that he thoguht all flashes came with it now.

 

It should man.. just come to a stop.. hold the clutch in all the way then press the gas all the way down... somewhere around 5-6000 you should hear it kick in.

I forgot to ask for it but it was included.. It kicks much ***

 

Alright I'll have to try it out once it stops snowing outside... It was really cool to get a chance to see all you guys and finally get to match some faces to names. I look forward to the next time AL is in town hopefully I'll have more on the car to be tuned and no boost leaks this time