Hello, first I want to apologize for my bad english.

My Car:

2002 Camaro Z28 5,7 LS1

I would like to improve my 1/4 miles times. Last time I drove 15 seconds. My modifications after 15 seconds are the following:

SLP Airbox, Longtube Header, 3 "Y-Pipe, 3" Dynomax Exhaust, EGR Valve Remover, Toyo Proxes Semislicks.

Already purchased but not yet built-in parts:

Nitrous Express Wet System,
Diablosport Trinity

What else can you recommend to me?
I would like to change my differential translation. I have 2.73 ratio. Which Ring and Pinion Gear Set is right for me? 10 bolt 7.5 or 10 bolt 7.6 or 10 bolt 8.5? Up to which ratio can I go? 4.11?

what would improve my 1/4 miles time?

Thank you

 

Do you use the car for anything but racing? You have had the PCM tuned for you mods? Do you have someone to help you with the nitrous? Nitrous CAN be safe to use on a stock engine, but if you don't know exactly what you are doing you can damage a stock engine very easily. Kits rarely have all the needed safety features to protect your engine from damage.

How is you budget? with Nitrous working right you can blow out a stock transmission and rear differential.

You are correct with your setup the best way to improve 1/4 mile time is to do something with the rear gears. 4.11 may give you the best 1/4 time but it kill you highway driving. Gears will not make the rear stronger, depending where you are it might be cheaper to just swap on the whole rear with a 3.42 rear form a standard trans car.

15 second 1/4 miles does not sound right for your car. Even with the 2.73 gears it should me a upper 13 second car. I have no idea if this is a car issue or driver issue but I would think you should sort that out first. V6 Camaro's run between 15-15.9 stock. With the 5 speeds being closer to 15 flat. I have owned both V6 and the LS1. My 2000 Z run right at 13.5 according to GPS/Torque app.

 

Thanks for your quick reply.

The 15 seconds were certainly not right. My tires were bad and the track is not good. The track is not asphalt but concrete

I do not know what PCM is in German. If you mean the engine control unit, I have not optimized. I want to do that when all parts are installed. My car is in the garage and does not drive in traffic.

The nitrous oxide is not installed yet. I have to find out more about how to do it.

my budget is not that important. If it costs a lot, I'll wait until I can buy it. Better wait and then be reasonable. It is important to me that the car is well set up. My goal is 11 - 12 seconds.

I once read that if you have original 2.73 ratio, a conversion to 4.11 is not possible with the 2.73 diff. Is that correct ?

which is the right one?
10 bolt 7.5 or 10 bolt 7.6?

In Germany, I have the problem that only a few know about the Camaro, this is very rare here.

I'm a coachbuilder, but I'm not so familiar with some things yet, but I want to learn it by doing it.

 

woh, 270s make it tough to get good time. did you even get to 3rd gear? im happy with 370 gears in mine. approx 2k rpms at 60mph with built auto trans and good 2k stall torque converter. 373 gears and, assuming you have a auto trans, a good torque converter will make a good difference. i dont think you will need nitrous to get to 12s. good cam and intake will do you good.

 

Camshaft and Intake I want to do later. I thought that I first work on the translation. which stallspeed would you recommend? and I still could not tell anyone which ring and pinion set to watch. Whether for gm 10 bolt 7.5 or 10 bolt 7.6? At Carid.com in the shop both sizes are offered for my car. I think I have enough power with my setup and the Diablosport Trinitiy to start with. I think the translation is the problem

 

Camshaft and Intake I want to do later. I thought that I first work on the translation. which stallspeed would you recommend? and I still could not tell anyone which ring and pinion set to watch. Whether for gm 10 bolt 7.5 or 10 bolt 7.6? At Carid.com in the shop both sizes are offered for my car. I think I have enough power with my setup and the Diablosport Trinitiy to start with. I think the translation is the problem

 

I do not want to change the camshaft and intake yet. I think I'll try it with a torque converter and the rear translation. Which ring and pinion set fits with my rear axle? There were two to choose from. 10 bolt 7.5 or 10 bolt 7.6 ... what stallspeed do you recommend for the quarter mile?
Are there any other little tricks for the mile?

 

if your going to drive this for transportation and track i would not go more than 2500, 2k seems to work pretty good for me although i sometimes wish i would have went for another 500 on it. to go to the gears you want you will need to change your carrier. 7.5 and 7.625 are same, at least thats how i understand it. have a look here Strano Performance Parts - Parts Search

 

ok with carrier do you mean the differential? But I've seen at carid that there is a ring and pinion set for 3.08 and down gear ratio with 3.73 and 4.10 ratio. That would have to fit then with original carrier or not?

@ Gorn : What are the safety features for the nitro system you talked about? What do I need to pay attention for. What should I install?

 

carrier is the unit at the center of the rearend that the ring gear bolts to, the smaller ring gear carrier will not take the larger ring gear.