tuning a big single

[knagel]

My sig isn't updated yet......
I now have a SC IV with a 1055. Completely built SoCal motor with stage 2 heads and 60% tips. This is a 3.0 bushed to 2.8 with a 1.16 AR exhaust housing.

I can bring the temp up to 800* and get about 2 lbs boost and then nothing after that and it won't blow through the brakes on the high side. When I let off the brake there is quite a bit of lag (like a couple seconds) before fully lit. When lit, holy sh*t, look out.

I know I've ready to decrease timing and increase pw down low. At what RPM below and how much timing do you start with taking away? I can build heat no problem, it's just getting it to spool quicker. I know it's not like the vvt I had, but when you are brake boosting it shouldn't matter.

Street manners is decent, a little smokey, well, alot smokey :rofl:,.....
can you have too much pw and be putting out the fire????????

I know this turbo won't be a tire frier when you punch the throttle, but it should develope boost by brake boosting.

PS---- The brake torque management is turned off in the tune.

Any ideas where to start to make a big single lite quicker???:hug::hug::hug:

Kev

 

[x MadMAX DIESEL]

Don't want to hear this probably, but my guess would be you need a tighter converter

 

[bullfrogjohnson]

Don't want to hear this probably, but my guess would be you need a tighter converter

Actually its the other way around. When trying to light a big charger in 4lo you need the loosest converter you can get.

All I can say is keep pulling timing from down low. Also are you leaving in 2nd gear or 1st?

 

[x MadMAX DIESEL]

Lefty loosy righty tighty right? lol But yeah thanks for catching that

 

[Mike L.]

You don't have enough converter.

 

[knagel]

I was in 1st. I only got to pull it once on the new build and the season was over. I have been messing with it in the shop trying to build boost in 1st high 2wd and it won't blow through the brakes.

How much temp does a 1.16 AR take to lite?

I think the timing is not the issue. It smokes like a coal train. Can you have too much fuel?

 

[knagel]

You don't have enough converter.

What should I have went with? I chose the 1055 over the 1056

 

[bullfrogjohnson]

you will have a terrible time lighting a 3.0 charger in 1st gear on the pulling track. I can barely light mine in 2nd

 

[x MadMAX DIESEL]

Too much fuel will eventually cool down the exhaust gasses

 

[never satisfied]

I was in 1st. I only got to pull it once on the new build and the season was over. I have been messing with it in the shop trying to build boost in 1st high 2wd and it won't blow through the brakes.

How much temp does a 1.16 AR take to lite?

I think the timing is not the issue. It smokes like a coal train. Can you have too much fuel?

I'm guessing that is what your problem is.

you will have a terrible time lighting a 3.0 charger in 1st gear on the pulling track. I can barely light mine in 2nd

I only run 1st gear and I never have issues $.02

 

[ripmf666]

I lite fine but have the 1.01 housing. And run the 1055. Timing is 27 deg pw is 3150 with 30 over injectors

 

[super diesel]

A tighter A/R on the turbine side will help. Also what size intake are you running? Is i the full size of the intake flange on the compressor? The bigger the better in this area and you can bring down the spooling Rs by doing this. Look at what rpm it really starts to get with it at on a repeatable basis. Report what you find.

 

[knagel]

A tighter A/R on the turbine side will help. Also what size intake are you running? Is i the full size of the intake flange on the compressor? The bigger the better in this area and you can bring down the spooling Rs by doing this. Look at what rpm it really starts to get with it at on a repeatable basis. Report what you find.

stock modified LBZ air box, intake tubing w/ MAF, and intake elbow. I have noticied that the air filter sensor has never moved until now and everytime I get on it it will compress the spring atleast half way.

I will try to drive it tomorrow to see what RPM it starts to spool nonboosted.

 

[maxaholic]

I would say that is a part of the problem.

 

[knagel]

I would say that is a part of the problem.

Are you running a big single or is this just what you would say.

 

[knagel]

I'm not trying to be a smart ass, just don't want people talking out their rear if they have never run one. I have never run one, therefore, any info I would be offering up at this time would be talking out my rear

 

[The Neens]

any info I would be offering up at this time would be talking out my rear

Dude, what did you have for dinner?:spit:

 

[Rhall]

I'm not trying to be a smart ass, just don't want people talking out their rear if they have never run one. I have never run one, therefore, any info I would be offering up at this time would be talking out my rear

Well when you think about it, its not brain science. Like sucking through a small straw, then going to a larger straw, less resistance. If i were running a 5 inch turbo inlet, i would do a 5 inch intake to make it get the most air it could. With that being said, its a big turbo, theres only so much you can do to help it, its going to be hard to light.

 

[Rhall]

Also, i dont know what your method of lighting the charger is, but in 4 low, the best way is to bring it up is real easy, and not flogging it, easy enough theres no black smoke till your ready to take off, if you put the pedal to the floor you will just put out the fire.

 

[maxaholic]

Are you running a big single or is this just what you would say.

Nope, just seemed like the stock air box would be way to big of a restriction for the amount of air you are trying to move. Plus the filter minder getting sucked in is dead giveaway.

P.S. I wasn't trying to be a dick. If my post came across as that, then I'm sorry. I was just trying to help you figure out the problem at hand.