Before and after Dyno

[Krash]

Before was 295 RWHP (I had said 297 in another post...that was wrong) After adding 52mm TB, Corsa cat-back, new clutch, and open lid on a K&N filter it went to 304 RWHP.

I was hoping for more for the money I spent....now I'm being told I should have changed to cat too....

The Corsa's sound sweet though....

I want somewhere around 330-350 RWHP....I have a feeling bolt-ons are not going to get me there. any ideas?

Oh...I need advice on tires too....at this HP do I need Drag Radials to hook-up?...these BFGs just spin. It's not a daily driver but I do mostly street driving right now...but plan to take it to the track some too..

Nitto's? The guy at discout tire says the Extreme Proformace tire would be a lot more sticky then what I have and last longer then the DRs... anyone? anyone?

 

[Krash]

hmmm...ok, 46 views...and no one has an opinion on tires even?


=\

 

[Copdogcorvettes]

Well I guess my first question would have to be, What tires do you have on there now. Also can you go larger. I'm running 295/50s on 10in wheels on the back of my C3. That's 10 1/2 inchs of tire on the ground. I have a 400sb with mild mods and I can break them loose if I really get into it. So, tire size is the first look.
Then brand of tire and tread style. I've ran mostly BFGs and COOPERs.

Gary

 

[sothpaw]

Yes, what tire do you have now? What BFG? The BFG KD should be a sticky tire, I've seen that for autocross.

Your Hp numbers--I think the TB and the exhaust alone should have doubled what you got. I am thinking that the Corsa did not give you the 10 hp gain it should have, maybe not any. Quiet, yet not restrictive, seems impossible to me.

The TB should take advantage of the LT4 heads.

 

[Krash]

I have the BFG KDs 285/40 ...But with ARS off they don't hook very well. It seems like for about 1.5-2 seconds of spinning (and smoking). I launch at around 3000-4500 RPM.

Maybe I'm not launching right. Should I leave the ARS on?

I have been told the Nittos are a sticker tire...but they make a street/strip(extreme performance) tire and a Drag radial.

If the ExPro is about the same as a BFG g-force KD...then I don't want to waste my money.

 

[all4c4lt4]

I'm surprised your gains were so minimal. I don't think the 52mm tb helped at all, but I wouldn't think it would hurt (but it could). Others have raved about the Corsa and shown good gains with just that. How was your a/f? Can you post the graphs?

I've heard others with ~325 rwhp w/ k&n, lt headers, high flow cats and catback system. (At least thats what they say). I think you need lt headers and better/no cats. Do you have gears? They will at least change how the tq is being put on the ground to "feel" stronger and lower your et a little.

 

[Shriker]

You are only getting power from the catback. On an otherwise stock LT4 , most can expect ~10 rwhp from a good catback. The TB does nothing for even a bolt on LT4 ......now when you go heads/cam or bigger displacement , definitely.

My car dynoed 318 rwhp and 328 rwt with longtubes, high flow cats , B&B catback with Xpipe, cut lid w/K&N. I did not dyno stock but I would guess it was around what yours was , ~295 or so. So I picked up about 10 on the catback, 10 on the headers (with GREAT midrange gains!!) and a couple with the lid/filter.

Hope that helps......

 

[warren s]

I also installed a Corsa exhaust, almost a total waste of 900 bucks.

The stock exhaust system is pretty good to begin with.

 

[C4DC]

If you have long tubes with no cats the difference will be more noticable. I feel the parts of the intake and exhaust system are closley matched and improving on only one or a couple of them will move the weakest link to the next stock part, which in your (and my) case is the cats and manifolds. I heard a lt4 like mine with long tubes and no cats and it was LOUD... You could also look into a hotcam for 30 hp...