View Full Version : E.T. guesses for bolt on A4


LS-ONE_DAY
05-03-2012, 07:39 PM
Looking at my short term goals I am planning on adding a 3600 stall torque converter to my car and I am wondering what you guys think my car should be capable in the 1/4.

Car: 1999 Firebird Formula A4 w/ 2.73 gears on stock 10 bolt, stock 4L60E
Mods: ARH 1-7/8" LT's, ARH 3" ORY, Borla catback (open), BMR LCA's, Nitto 245/50R16 555R drag radials, SLP lid, FTI 3600 stall, cooler, tuned by Andrew at CSP.

I'd like to see 12.5 but that may be a little optimistic, not sure.

Gunslinger09
05-03-2012, 09:19 PM
12.5 with the converter easy. No stall with the 273 gearing 13.0-13.2.

02'Andy
05-03-2012, 10:13 PM
You should be able to break into the 12s without the stall depending on how well you launch and what the DA and track conditions are. I'd say 12.9-13.1. With the stall, you should be able to get pretty close to 12.5-12.6.

s346k
05-03-2012, 10:26 PM
i'd say 12.9 stock stall and 12.3-12.2 with stall. will depend on those tires...because they suck haha.

Its Slo
05-03-2012, 10:29 PM
12.70's or 80's

LS-ONE_DAY
05-03-2012, 11:19 PM
I would consider 255/50R16 MT ET Street Radials since they would fit I think, but I know they hook better and I want to be as careful with the 10 bolt as possible. Although with the auto and 2.73's that may not be a problem

02'Andy
05-04-2012, 12:58 AM
^ A4s are a lot more forgiving on the 10-bolt than manuals because we can't drop the clutch from 4000+ rpms. The 3600 stall is probably going to shorten it's life from the extra torque at launch, but it should still survive a while until you're putting down more power. Lol then again, there have been guys who have blown their 10-bolt on stock power too, so it's basically the luck of the draw.

LS-ONE_DAY
05-04-2012, 07:53 AM
Lol then again, there have been guys who have blown their 10-bolt on stock power too, so it's basically the luck of the draw.

That's what I'm worried about, seems like I usually have bad luck with things like that. I don't plan on going to the track and running it with the stock converter...maybe I should though for a baseline. Of course it has street tires on it now which will slow it down.

groundZ-28ERO
05-04-2012, 07:57 AM
555r will give you plenty of traction, mine do just fine on a preped track.

LS-ONE_DAY
05-04-2012, 09:17 AM
My "local" track is 75-80 Dragway, Maryland's oldest drag strip. I haven't really heard anything that stands out about their track prep, I guess I'll have to do some research.

I'm really hoping to get the 12.5 and then with a cam maybe hit high 11's or 12.0 (maybe with a built trans/rear if necessary).

If any of you guys run nitrous, approximately what kind of ET drop could you expect using a 100 shot? If I can break into the 10's after the above mods with a 100 shot I'd do that but I'm a little wary of running nitrous with the ramp rate of the cam and the 3600 stall. (looking at the TSP Torquer V2)

c0ncEpT
05-04-2012, 09:34 AM
Get some real tires.

When my car had close to the same mods as yours it went 12.19 @ 113 with a 1.67 60'.

LS-ONE_DAY
05-04-2012, 10:02 AM
Dang really? What tires were you running there?!

c0ncEpT
05-04-2012, 01:50 PM
275 ET Street Radials.

Only things I had that you don't are an LS6 intake and a UDP I believe.

Not to mention I only made 3 passes with the car like that before I took it apart. It would have gone into the 11's the way it sat with more seat time.

MikeG
05-04-2012, 03:02 PM
Screw the Nittos. I've had them on several cars and never got them to hook. I've had good luck with M/T ET Streets, M/T ET Street Radials, and Hoosier drag radials. I would not worry about the 10-bolt at the bolt-on level with 2.73s. Don't put a cam in the car with those gears, though, it will be really sluggish IMO. Put a 12-bolt/9"/S60 or something in the car, then add more power.

If you can get a decent 60', then I don't see why a 12.5 isn't attainable.

LS-ONE_DAY
05-04-2012, 05:09 PM
I was originally planning on getting a 9" with 3.50 or 3.70 gears but I may go with an S60 since they're cheaper.

I may need the serpentine belt replaced soon, would that be a good time to add a UDP? I don't really know anything about them lol like what they affect

senicalj4579
05-04-2012, 05:26 PM
My car did 12.6 with all mods in sig MINUS the ss3600 stall in -1000 da full weight
Same car did 12.0 with addition of ss3600 in -1000 da full weight
Same car did 11.9 with about 200lbs of weight reduction in -187 da

I will say you will do 12.5 easy in spring air da.

MikeG
05-05-2012, 01:42 AM
I was originally planning on getting a 9" with 3.50 or 3.70 gears but I may go with an S60 since they're cheaper.

I may need the serpentine belt replaced soon, would that be a good time to add a UDP? I don't really know anything about them lol like what they affect

I'd wait until you do a cam swap to do a UDP. They are only worth a tenth or so anyway. Changing the belt is a 5 min job.

LS-ONE_DAY
05-05-2012, 10:50 AM
Cool I'll keep that in mind then. Thanks guys.

LS-ONE_DAY
08-20-2012, 09:55 AM
UPDATE

Ok guys, still haven't taken the car to the track yet but will be soon (hopefully, weather permitting)

I'm still hoping to see 12.5 but my setup has changed very slightly so if you have any new opinions on what it could run let me know. This will be the first time I've ever been down the strip but don't let that change your guesses, I want to know what the CAR should be capable of, not what I'm capable of :jest:

Car: 1999 Firebird Formula A4 w/ 2.73 gears on stock 10 bolt, stock 4L60E, 245/50R16 street tires
Mods: Custom FTI ~3600 stall, ARH 1-7/8" LT's, ARH 3" ORY, Borla catback (open), BMR LCA's, SLP lid, UMI PHB, Founders STB, Hayden cooler, tuned by Andrew at CSP.
Dyno numbers: 326rwhp 322rwtq on 90* day

I'll probably take out the spare tire at the track and I'm going to try to have about 1/2 tank of fuel. Not sure on tire pressure for street tires.

jrob56
08-20-2012, 10:16 AM
My guess is 13.0 based on the following:

I just went last week on a similar setup, slp lid, ls6 intake, UDP, ARh 1 7/8s and ory, mufflex clone with mag 4x9. RPM trans, vig 3600 stall, cooler, 3.23 gears. On a crappy 245/50R/16. Stock suspension, besides poly motor mounts.

First run went 13.1 at 106 on a 2.1. Next couple runs I tried to stall it up a bit, all were over 13.5 at 106, massive wheel spin. Finally found a sweet spot rolling out and punching it and cut a 1.9 60ft, started getting the knock flashing SES light, ran a 13.06 at 103... Car pulled a lot of timing when it saw knock or I woulda got my high 12 pass.

Headers were knocking against K it looks like. Anytime I got a good bite it would see knock and retard timing. After I trim the K some more Im gonna go back and just try to get a high 12 down. Its pretty hard with street tires and next to impossible to be consistent.

Now after I get some good ET street radials this winter bolted up, Ill come out next year looking for a 12.2 and I think itll be easy to find!

LS-ONE_DAY
08-20-2012, 02:02 PM
Wow I'm honestly surprised it was that slow! I was hoping to at least run 12.8 on the street tires...

blk/slvr02ss
08-20-2012, 03:46 PM
Put a 3:23 rear in there and you will see 11's on a good tire. I went 11.80 on Nitto's w/ the same bolt-on's and a 3:23 gear.

jrob56
08-20-2012, 04:09 PM
Wow I'm honestly surprised it was that slow! I was hoping to at least run 12.8 on the street tires...

Idk just my guess, I think best Ill get is 12.7-12.8 on street tires after I iron out my issues. Since your on an ls1 intake I guessed a bit lower, hence the 13.0. Only one way to find out though, get out there and post up after.

LS-ONE_DAY
08-20-2012, 05:24 PM
Put a 3:23 rear in there and you will see 11's on a good tire. I went 11.80 on Nitto's w/ the same bolt-on's and a 3:23 gear.

From what I've seen, 2.73 cars and 3.23 cars pretty much run the same times with = driver.

Idk just my guess, I think best Ill get is 12.7-12.8 on street tires after I iron out my issues. Since your on an ls1 intake I guessed a bit lower, hence the 13.0. Only one way to find out though, get out there and post up after.

I know senicalj ran 11.9X with his SS3600 and bolt-ons, although he has an LS6 intake. Not sure on what tires he used for that pass.

A buddy of mine has DR's on his RX7. He said I can borrow those but I'm not sure if the bolt pattern of the wheels will be the same.

02'Andy
08-22-2012, 12:01 PM
To put the street tire time in perspective for you, I ran a 12.88 on drag radials with everything in my sig before I had my stall and cooler installed. DA was around 1500 or so. To get that time, I had a half-decent burnout, and removed my passenger seat, spare tire, and jack.

Now granted, I'm not a light guy, so the car's race weight is heavy, but it still took my NT05r's to get dialed in to 12.88.

And I've got stock 3.23 gears.