Hey everybody,
I ran my 99 Formula at my local track's test and tune on Friday night. I'm pretty pleased with the results but am wondering now what direction to go to bring it further into the low 12's/possibly high 11's. I made 2 passes before someone's trans puked and closed the track for a while..
Pass 1: 12.57@110, 1.830 60 ft, 8.114@86.56 in the 1/8th
Pass 2: 12.57@110, 1.831 60 ft, 8.095@86.36 in the 1/8th
Mods are as follows.. SLP Lid, TSP 1 3/4" headers, magnaflow catback, Yank SS3600, Tick 229/232 .614/.575 cam.
Car was tuned by a local gentleman who is very experienced with these cars, and still has stock heads, stock LS1 intake, stock 2.73 gears, and the passes were made on Hankook street tires at ~30 psi of air. What has me stumped is the fact that the car dead hooked on both passes, even with crappy street tires.. The gears definitely need addressed but I've been told they would only be worth about a 1/10th over the 2.73's in the car now. Any thoughts/comments are appreciated! (passes were made at the mason dixon dragway in MD)

 

very unusual even with 273's that you dead hooked a cammed ,convertor'ed , bolt on car on regular tires...

the 110 trap says its making enough power now to go 12.1-12.3 ish , that being said you would expect a cammed car to be trapping at least another 5-8 mph.

did you flash the convertor from idle or hold rpm's up against the brake ? what rpms are you shifting at and what gear are you in and at what rpm going through the traps? My gut says you cant be seeing the rpms needed to get the most from your cam or you would have trapped higher.

 

I held it at about ~1500 and launched it from there. It's shifting at 6400, and it feels like it's JUST shifting into drive as it's getting ready to cross at the other end.

 

To add to murphinator's post I would also get at least a ls6 intake on there asap and get that thing flowing
Also give this thread a quick read, pretty much same setup as you https://ls1tech.com/forums/12-second...our-input.html

 

Nice 60' on those tires.i bet it's fun to drive on the street if it hooks like that.

 

Nice times on those tires. I picked up over 30 RWHP and 5mph going from LS1 intake/FIPK to Fast 92/92 CHRS1313 non AC.

Congrats!

 

+1. Surprising.

 

sounds like you should try holding 2nd through the traps even if it ticks the limiter a couple times ( why I asked what gear and rpm lol)

You could potentially reduce your 60 foot by mashing it from idle which will flash your stall up higher s well as more abruptly transfer weight to the rear where you want it , but in your case it may just blow the tires off doing this- but on a dr I would surely try mashing it from idle. A cammed bolt on car should benefit greatly from dr's but it sounds like you are doing the best you could hope for on your current tires.

Your cam is really coming on for you on the 2nd 1/2 picking up nearly 24 mph from 1/8 to 1/4 , get the first half a bit stronger and the et's will improve a lot.

 

thanks everybody for the responses. Like I said i'm really surprised that the car 60 ft'd as well as it did considering the gears, tires and the fact that it's all stock 130k miles suspension lol. Would it be worth getting a set of drag radials and trying to launch the car from idle with the 2.73's, or are there certain suspension pieces I could try to grab up that would benefit me more? An LS6 intake or a FAST (if money allows) is definitely in the cards at some point in the future.

 

I am on stock suspension and pull consistent 1.7x 60' with a best of 1.71 with yank ss3600, Lt's and 3.73's.
IMO I would do intake and drag radials first, you should not have a problem pulling 1.7x-1.6x 60's on stock suspension IMO

 

Those are good numbers. in regards to the gearing in my experience with my car you will gain much more than a tenth. if you were to switch to 3.42 ratio an have a good tire you could see those numbers in the low 12s no problem

 

I gained .3 in the 1/8 by going from 2.73 to 3.73 it was worth it for me

 

+3 on 3.73's and drag radials. An aftermarket cam needs to get into the higher RPM's quickly, and more often (going thru 3 gears instead of 2).

Al

 

What was the da for the runs? Mph does seem low, has it ever been on a dyno to see what its making for power? Ls6 intake, 4.10 gears and a sticky tire should wake it up a bit.

 

DA for the runs was around 1600. Sadly, it's never been on a dyno, the tune was actually just finished about 2 days prior to me running it at the track. The MPH seemed really low to me too, would that be a result of the lack of a good gear, or is the intake choking it off? I found a local guy with a set of stocker 16's on nitto DR's for $250, tires only have 3 passes on them.. I might try to scoop them up before I take the car to the track again. Would I be better off to get a 3.42 rear out of a 6 speed car instead of swapping in 3.73's?

 

Absolutely get those tires for that deal.

And 3.42 or 3.73, won't be a discernible difference with a converter in the car, whichever is cheaper(used 3.42 10 bolt most likely).

- Drew

 

Where are you shifting?

 

Its shifting right at ~6400, is that about right for the cam?

 

Bump the shift points up to 6600rpm and it will pick up. If it does pick up(which it should), try 6700rpm. I'd have no concerns shifting at 6700rpm with your engine at the track where you're attempting a new best.

That doesn't mean you have to shift it there all the time, but I would when racing someone or racing at the track.

What RPM are you going through the traps at? I would imagine with a 2.73 rear gear that it's shifting into high gear right before the traps? If so that is also killing your RPM and ET.

Customer was only trapping 111mph with his 6 speed car with a 233/236 112lsa camshaft. His tuner then took it for a pass and got the same MPH as his customer. They were crossing the traps in 4th gear at roughly 6100rpm. He then took it for another pass and left it in 3rd gear through the traps which allowed him to cross at 6900rpm. Car went 115mph and a new best ET as well.

Very important to keep these cars in their powerband for best performance.

 

This right here. There's a guy currently on here with heads and cam only trapping 111. His gearing and shift points are way off. 3.73s in an a4 with 28" tire. Not going to get it done @ 4800 going through the traps.