Hi, I have a sts powered 5.3 stock bottom end with parts in my sig. I just put in 411's It feels really good with the 411's and the low compression. (6.0 heads) I have a 02 zo6 cam, I think I need more cam. I have a 6 speed with a 2 step. I just want to maximise spooling between gears. I have been thinking of going automatic because of this. I don't think I have a spooling problem, I think it spools great, but It always can be better right? I have the exhaust wrapped already. I just don't like the idea that every time you shift you have to build boost again, if I went auto I would have boost through the whole run. But I don't want to go automatic. Any other Ideas to get the turbo to spool faster?

 

lose the 4.11s

 

Definatley loose the 4.11's and go with something more like 3.42. You need to load the turbo and you will notice a big difference. With the 4.11's you are just flying through the gears and not allowing the turbo to load up and work efficiently.

 

If its really laggy, a 50-75 shot of nitrous kicks the turbo up really fast.

 

fuel injector in the header

 

An extra injector is a pretty violent method though, not really good for a street vehicle IMO.

 

get rid of the 4.10 gear for a numerically lower gear like 3.42, makes a huge difference in spool and makes the car faster.

 

....?

 

what everyone else said. Get rid of the 4:10s. I am slowly putting together my own truck and going with 3:08s. Keep that turbo loaded!!

 

reatard timing when you want to spool

 

Get rid of the STS

 

fuel injecto in the the headers is kinda like a piggy back ride that thig out look at AFR when on the the two step "or whatever" we like rich, AND retard the **** out of timing whallaa instant back pressure big boost see ya later

 

I love beer on a friday night too but maybe you should take it a little easy on posting. Sorry had to do it.

 

The reason why I went with the 4.10 is the 6th gear was useless and I run 30 inch tall 20 inch wheels. At 70mph I was at 1650 rpms and was lugging any lower than that with the 3.73. I am in the 1800's with the 4.10's. I was setting up my gear ratio to be in the 5500-6000 rang when going through the traps. I had 3.73's and was going through the traps at 4800rpm. I wanted to use as much of the 4th gear as I could, because of the 1:1 ratio. Should I still go with the 3.42's? I will be running a 29in tall tire at the track Mt drag. remember this is a 4300lbs truck. I have the NOS hooked up, I was going to use a 35 shot to help spool. should I go bigger? Thanks for you guys help. I figure If I can get a 125mph trap speed I should be really close to a 10 second pass.

 

A 50 shot would work nicely. Looks like you've got everything else covered.

Definitely dump the 4.10's for 3.42's. Blowers love gearing, turbo's don't. What gear were you in with the 3.73's that was lugging?

 

I don't think the 4.10's are going to hurt him much with his setup. Thirty inch tall tires really changes the effective gearing quite a bit vs your standard 25.6" tall tire.

A stick shift car will always spool slower than an automatic. Probably not much you can change to improve it more short of going auto. Dropping boost between shifts is a part of life as a stick car, so are blown clutches.

P.S. Check the time in my sig, I don't think a 67 turbo can get you to 125mph. I don't think you could run a 10.99 @ 125 either being stick unless you are an unbelievable driver. My 10 sec passes are all on 1.6x 60's leaving the line already at 10psi.

 

no need to stick an injector in a set of red hot exhaust manifolds! you have 8 feeding the engine!!!!!!! lol

FIRST, get the stuff done above! run stock maniolfds that are maybe proted. these will help to keep the heat in there! then get the whole hotsode coated, inside and out!!! this again will help keep the all important heat in there! you could then wrap to, but it maight be a bit overkill i think???

ater this your looking at more major stuff!

cam. go for a proper turbo cam.

N2O. works great at helping to spool the turbo and does wonders for cooling the intake to! you should see about twice the power to the shot your using. so a 50shot SHOULD net you about 75-100bhp increase!

turbo. id look into getting the turbo rebuild with a ball bearing core. alot of people on here think they are a weast of time but that crap! lol they do work! all i need to say really is 2.0ltr with GT42R (dual ball bearing turbo) spooling that turbo by about 4.5Krpm!!!

ANTI-LAG! now this is the one i like atni lag is basically retarding the timing to the point where the fuel air mix is still burning in the exhaust! this really hot (good ) and high presure mix then hit the turbo like a sledge hammer and keeps the turbo spooling even though you have the throttle closed. sooo you come off the gas, the antilag kicks in and the turbo KEEPS spinning, you hit the gas angain and the turb is there for you. thats the diffrence etween atnilag and usng N2O!!!!!! these systems have been used for AGES in rallying and they work a treat. the only doewnside is they can reduce the life of a turbo! BUT with the turbo sat alll the way out the back there is less presure and heat for it ti deal with so itd not a problem!

now how do you get anti lag???? well i dont know if the GM ecu will let you alter the values but most aftermarket ECUs do! all you basically need to do is keep the fuel air nice and rich on over run! then you could look into the idle controle valve! this is a valv that some engines have 9im not sure if the LS has them????) that modulate the airflow at idel to keep the car running. i think they are normally found on turob motors. this is a great way of altering the amout on antilag you want! the more open the valve is, thus the more are you letting the engine have with the throttle closed, the bigger the anti lag!

NOW you can use anti lag as a luanch system to, and its better than a 2step! its basically just like a 2 step but instead of CUTTING ignition timing, you simply retard the timing (thus giving you antilag on the line ). now rally cars often make well over 15psi sat on the line. agian this is very well proven and would work great on the street to!

imagine being sat with some TW*T up your **** at the lights. you turn the anti lag/launch controle on and open (wide) the throttle. then you get 3 foot flames coming out the back, 5psi (jusy a guess) boost and a very nice lauch to oh and the guy behind doens't even try racing cos you have just torched his fornt bumper!

thanks Chris.

PS i will have forget something so please ask if you have any questons

 

You keep talking about a 2.0 Evo's spooling 42R's by 4500 RPM's, but I'd like to know where you're pulling this out of. A .96 A/R T4-frame GT4276R on a 2.0L motor and you're looking at full boost in the 7000 RPM range. With a 2.4L motor the shop car AMS built was seeing full boost by 6000-6500. A far cry from 4500.

 

Great info guys. I was laging in 6th gear, it just was not useable(3.73 gearing). I just had some 3 bar SD tunning done. That really woke up the truck, I will talk to my tunner about the retarding the timing to help spooling. Again, I dont think I have a problem with spooling, I'm just trying to think of ways to make my setup better with out going automatic. I am thinking a turbo cam and maybe some 921 valve springs, I dont think the 918's are going to like the higher boost, and NOS. The last time I was at the track I ran 14psi (about 520hp) and ran 12.7 @112mph with a 2.2 60ft, leaving the line with about 5psi(spin or bog with the low compression). I ran the same with mt streets as I did with my 20's, I didn't heat them up enough, I was doing only 1st gear burnouts, I should have done 2nd gear. I will be turning up the boost to 20psi next time, maybe turning on the NOS, and I will be working on my suspention to get that 60ft down.(that was with 3.73's and MAF tunning, I could not go over 600rw because of the MAF couldnt keep up) Last time on the dyno I made 680hp and 780tq on the little 5.3 and gt67@25psi LOL. (it was an accident) There are automatic trucks running 11.8's@118mph/1.8 60ft. with 550hp (sts kits) I really think I will only get around a mid 11, but wanted to set my gearing alittle faster 125mph just in case. I think I should be close. My goal is to get the stock 5.3 as fast as posible and then go forged 5.7 iron. A high 10 would be great, a low 11 I would be happy with but I know I will have an 11 for shure. I think Parish did 10.96 with a stock 6.0 bottom end making 630hp on turbo and a 75 shot. I weigh about 500lbs less, and I'm not running through the 4l80 and transfercase. I think I should be close to his times if I can get out of the hole. LOL.

 

What is your avatar? Looks like a swastika