Well yesterday was the first time I brought my car to the track after owning it for 7 years. I had my heart set on 11.7's but would have been happy with anything starting with an 11. My car made 433rwhp on the dyno so I figured with my 3200 stall and nitto nt05r tires it would be easy even with a 1.8-9 60ft.

I only did get three runs in since we went during a jegs shootout and kept cutting down my 60 foot times from a soft launch 2.000 to 1.996 to 1.892. All my mph's were 113.35-113.9 and I thought they should be around 118-119mph with my horsepower or am I wrong? I do still have 2.73s.

60'..........1.892
330.........5.149
1/8.........7.815
MPH........92.68
1000......10.127
1/4........12.122
MPH.......113.35

 

The gears are killing you. Put some 3.73s or 3.42s in her and I guarunteeeee it will run in the 11s===High 11s with a good tire. I bet it would with 3.23s and your MPH will be up some. Good Luck

 

I agree somethig don't add up...with 430whp you should be trapping 118-120 easily.

 

Rwhp means nothing in an auto. Converter is a bit small and those tires suck. You really have to heat those to get them hooking.

The mac mids are holding you back as well as the cats.

That setup would not normally dyno that high, it was a happy dyno or the like.

Throw a 4000 converter and a real set of tires on it and drop several tenths.. Put in 323 or lower gears to take out the 3rd gear lag, pick up 1-3mph.
Change to some tsp 1 7/8s with a nice merge pick up another couple mph and a tenth or two.

A lot left in that combo.

 

What was the DA when you were racing? With 430hp you should definately be trapping higher than that..

 

Put some 3.73 gears in there and you'll be amazed at the difference.

 

Thanks, I think I'm going to do some 1-7/8 headers, a pull-out 3.23 rear since it is my DD, and get it retuned.

 

Sounds like a good start.

Don't be afraid to gear the car either. If you find a 3.42 rear I wouldn't pass up on it.

 

I did not see anyone ask. Are you dead hooking or are you spinning some? What were you bringing the RPMs up to when staged?

 

Go with 342s... Many reasons I could explain why they are the best on a budget build... But to simply put it, they are the best bang for the buck and little to no difference from 323s in mpg (and not difference in 373s in performance).
If money isn't a huge concern, street car 373s.. weekend warrior/track car 410s.

i recommend PTC on the converter if you want to change completely.. If not, stick with Yank. Both perform top notch.

 

I was dead hooking but I wasn't launching too hard since I only got three passes in and it was my first time at the track. So used to just lighting them up on the street so every time I just launched a little harder. I know if I got a couple more passes I could have done a 11.99 but my trap speed is what is bothering me. Bolt on cars are running the same 113mph.

Picking up some new ARH 1-7/8 catted headers tonight after reading all the fitment issues with the TSP headers and y-pipe.

Now I just need some help finding a pull-out 3.23/3.42 rear. The reason I wanted 3.23s over 3.42s is because I figured the 3.42s would be on their way out living behind a 6 spd. I'll just keep my ss3200 though since I'm happy with 1.75-1.85 60ft's.

 

[QUOTE=camz28arro;15524965 my trap speed is what is bothering me. Bolt on cars are running the same 113mph.[/QUOTE]

I notice you are going over 92 in the 1/8th. So you are only pickup up 21 MPH from the 1/8th to the quarter. I typically see the F body guys pickup up 22 to 24 MPH from the 1/8th to the 1/4. What was the D/A, wind speed and direction?

 

I just noticed that too. That's what my 1/8 was when I ran personal best of 11.63. Is it getting enough fuel in the upper RPM's? or trans slipping?

 

Don't over look the air quality and wind. In my experience those two affect the 1/4 considerably more than the 1/8. It may just be that simple. As for fuel, you will just have to monitor your AFR to answer that. You might also check for detonation (spark knock/timing retard) on the big end.

 

I will get it retuned with the headers to make sure what it is doing. The wind speed was not high but it was a tail wind. My car REALLLY felt like it was slowing down in third gear. Probably due to the 2.73s and 6300rpm shift points. It was at Atco so the DA was most likely low.

 

I would not rule out the trans starting to slip. I was running 11.6-11.8 first two times out this year. It then started running 11.8-12.0 and later 11.9-12.1 and MPH down to 113. I just assumed it was DA as we got near to mid summer. One day on the street I noticed while cruising in 4th with TC locked RPM's would rise just a bit, then more and more until it did it in all gears.

 

the car is not backhalfing at all. 21 mph leads me to believe it has a problem with the tune or transmission. on a dyno the tuner should be able to tell you if the trans is slipping or not.

my bolt-on a4 car got down to only picking up 22ish, after swapping converters it went 24+ out the tophalf all day. my m6 car picks up 24-26.

 

vette doctors dyno is happy.... either way, somethings up, because you just arent getting what power you do have down. But 433 rwhp A4, with that setup? Bet it wouldnt break 380 on kaltechs dyno. Still, you seem down a good 4-5 mph...

 

What's wrong with my set-up that it wouldn't be making 433rwhp? I need to find that missing horsepower cause these heads/cam should easily be capable of 433rwhp through an A4 with the 1-7/8 ARH I have sitting in my garage., if it isn't just my 2.73 gears killing me.


Also, I don't feel any tranny slipping, I have a performabuilt tranny and it's just that my car is shifting to third exactly at 92-93mph (1/8th mile) and it drops down to 3500rpm going into third. Hopefully the headers, higher shift points, and 3.23s/3.42s will net me some mid 11's.

 

Don't get caught up in the dyno numbers, mine made 385rwhp through the M6. Something is definitely up with your top end pull though. Your 1/8th mile trap is pretty decent.