i went to the track today for the first time in the evo and was pretty dissapointed .Boost was set @ 21 psi taperin to 17ish on 91 octane, I was launching off the 2 step shiftng at 7k the runs seemed perfect and the car ran the same time consistantly all day. my mods are Megan catless TBE, K&N dropin, FiGhters garage LICP, Halman MBC, 255 pump and a street tune by dynoflash. Untuned the car made 304/276...
and the track is a little over 2k feet @ sea level...
Here are some break downs sorry i dont have a scanner...

1st Run ever in the EVO

60-1.901
1/8-84.29
mph-84.29
1/4-12.899
mph- 106.66

2nd Run

60-1.89
1/8-84.47
mph-84.29
1/4-12.865
mph- 107.11

3rd run

60-1.79
1/8-81.60
mph-83.21
1/4-12.868
mph- 105.36


Any help would be appreciated!

 

No way to know without logs. The driving could improve enough to get you 12.5-12.6, but that's about it. With 304whp, you should have much higher traps, and you said that was untuned, so you should be around 320-330, and thus even higher traps. Maybe that dyno reads high, or something changed or got messed up since the tune.

 

the only thing that changed since the last dyno was i had an agency power BOV but i put the stocker back on before the tune....
and thanks

 

Well, I don't just mean things you physically changed - things within the car can change themselves without you knowing.

 

well ya i know just statin the obvious ones... 12.8@107 just seems real slow...since the tune the car just doesnt seem to have much up top at all

 

Justin,

After speaking with you over the phone I realized a few things. First of all, we are not at 2k feet like you said buddy, we are at 3100ft and to make matters worse you ran in a sunny daylight in the Arizona desert... that is the cruel reality of drag racing in Tucson

I also starting to believe that perhaps you never installed the heavy duty spring on your hallman. If this is true that would explain the rapid lost of boost.

I ran Socorro's (Evo9grl) Evo 9 with the same mods as you minus: custom tune and fuel pump and I managed a steady 12.51 twice and a 12.59 trapping 111.95mph. Keep in mind our Evo 9 only put down 300whp/308whp the last time at the dyno.

I am starting to believe that your car has a faulty boost discrepancy somewhere(pinched lines on the BOV,wrong spring on the MBC).

Granted we are racing in one of the worst tracks in the country I still believe your car is capable of mid 12's. Al mentioned that your car was tolerating 23psi.

Ironically I was present when Al custom tune your car, you were not. Among all the Evo 9 Al tune that night(2 weeks ago) your car was the one that was tolerating the most boost.

Additionally, your pretune dyno numbers are exceptionally strong. I truly think something has been changed after the tune.

You call me almost everyday sometimes a few times a day, feel free to call me again and I will look at your car. You are a good driver, I have seen you racing your SRT-4 before, I think we are dealing with a unrelated tuning issue but with a faulty component.

When you told me that you added a few gallons of race gas and still ran the same times then it called my attention. Not a single time in the many many cars I have taken to that track any of my car did not improve with race gas. I tipycally gain 2-3 miles and I shave 2 -3 tenth of a second.

Don't be dissapointed my friend. We will get it right.

Carlos

 

Justin,


Here are some of the times that me and David(Guerrillah) ran the same night at the same track with almost identical mods as you:

David's Evo 9 MR

R/T .656 <-- i dont worry about RT
60" 1.747
330 5.169
1/8 8.034
MPH 84.07
1000 10.481
1/4 12.552
MPH 111.76

Evo9grl's Evo 9

r/t .127
60' 1.819
330' 5.208
1/8 mile 8.040@85.47
1000' 10.464
1/4 mile 12.513@111.95

I ran the Evo 9 111mph twice and 12.51 twice also. Speaking of speeds and times, review your 1/8 mile figures, you posted something that does not correspond. Your 1/8 mile should be time and speed, you posted something else.

After I finished reading this post from you now I strongly believe your boost if hindering your car from achieving faster times
https://www.evolutionm.net/forums/sh...0&page=1&pp=15


Carlos

 

1st Run ever in the EVO

60-1.901
1/8-84.29
mph-84.29
1/4-12.899
mph- 106.66

2nd Run

60-1.89
1/8-84.47
mph-84.29
1/4-12.865
mph- 107.11

3rd run

60-1.79
1/8-81.60
mph-83.21
1/4-12.868
mph- 105.36


Well, what happened on the 3rd run? Did you miss 3rd gear? If you compare the mph in the 1/8 of the first and second runs, they are way off. Something had to change for the mph to drop so much in the 1/8.

Then, compare you 60ft. times in the second and third passes. You cut a full tenth of your 60ft. and ran a slower 1/4 mile??? That definitely isn't right. You should have run about 12.66 on that last run.

 

srt2evo9,

Dude, those look like pretty good numbers for Tucson... especially since it was your first time at the track (with the Evo) and considering you were using 91 octane. Seems like almost all Evo owners need a little practice before they start nailing it.

Your taper seems a little odd since you've got a MBC and a custom tune. It sounds to me like you might have a leak. Maybe Carlos or Ray could help you do a boost leak test.

 

carlos the halman does have the heavy spring installed in it first thing i did when i opened the box...also the car was doin 23 psi today it was @ 21ish... And for your posted time on your IX wasnt that on race gas and @28psi?

Mr.MR...didnt miss a gear in any of the runs I WOT shift every gear never missed one or had even the slightest hicup down the track...Like i sais all the times felt perfect...

Spoolin..Thanks hopefully i can get it figured out

 

Yes indeed Justin, we ran the Evo 9 with some race gas making the final mixture of around 100oct. As far is the boost, we ran 28-30psi and never dropped below 21-22psi by red line.

The way you are dropping boost makes me think there got to be a boost line leaking somewhere. The stock BOV on the evo9 seem to be working the best for us. We can look it up tomorrow if your want.

Remember one thing Justin, this is your first time at that track with that car. My first
runs on the Evos were not impressive at all, I am absolutely confident that you should be able to improve those times very soon. At this time I have no doubt that your boost issues are the source of the problems. 12.8 sec in Tucson is not that bad after all.



Carlos

 

Mr.MR...didnt miss a gear in any of the runs I WOT shift every gear never missed one or had even the slightest hicup down the track...Like i sais all the times felt perfect...

Definitely got something going on there. The thing I'm thinkin is if it was a boost leak, why did it run close times on the first 2 passes, then slow down up top on the 3rd. It would seem to be mechanical since it isn't always happening. Was there a major change in the weather between the 2nd and 3rd passes?

 

it got @10-15 degrees warmer

 

Just like when you run, you run out of air at 3100ft. Got to make use of all the boost you can hold, you mentioned your boost tapered to 17 psi right? Just think what it would do holding 21 to redline - which can easily be done with a 9 even at 3000feet.

Boost, DV, and WG leakage = taper = 12.8 ET instead of 12.4

good luck

 

Maybe you are not aware and shifting to fifth just before the line even more since you are shifting at 7000 the EVO 9 are in the red from about 105 mph so you need to stretch 4th gear to 8000 rpm to cross the line and that will give you some more et and mph