Why can't I build boost for a launch? A/T

[EagleTalonTim]

I just recently put an Evo 3 16G on my 1g and I am having a hard time getting it to spool up for a launch. I can hold the brakes down and rev up to around 2500 and that is all....most of the time. It feels like it is too weak to go up any higher. I still have the stock torque converter so I know that is one of my problems, but there are a few times I can rev it up to around 3K (when the car is running strong) and it will launch hard as hell and will not bog down on take off. I am currently running a JDM engine with a cyclone intake, 450 injectors, rewired stock fuel pump, and a M/T ECU, and 14psi. If I get the cyclone working correctly, will that help build boost better? I heard that the cyclone gives better torque at lower ends. Ever since I put the 16g on, the low end torque is ridiculously low, but the high end is WAY better than the 13g. Thanks for reading this and i hope you can help!

 

[Nekoni]

It just sounds like you can't reach the boost threshold, higher RPM torque converter would solve that. Make sure you don't have any exhaust leaks before the turbo because I would have thought 2500 would of been enough to start spooling a 16g under load.

 

[autotalon]

are you doing it in drive? or 2nd gear? try both, see if there is a difference.

 

[EagleTalonTim]

I drive with my manual shift box that I created. It is in first gear when I attempt a launch.

 

[kanderson]

Yeah, a 16g won't begin to boost until higher rpms than your old turbo, so you probably just can't reach that rpm with the stock torque converter.

 

[97gstjosh]

I have an EvoIII 16g on my car and at 2500rpms it has built 12 pounds and then it starts to give. Sounds like you have a diff prob. I would check for exhaust leaks

 

[EagleTalonTim]

Yeah, I think that is my problem. Got a nice crack in the top center of the manifold Any suggestions on what to do? If i can't repair it, are there any decent replacements that can accept an external waste gate? I have one laying around but I have no idea what kind it is. Bought it from a guy on here and it took 6 months to get it. It did not come with the dump tube either My budget is EXTREMELY limited so I can't go out and spend hundreds of dollars on a manifold right now. I will NOT buy one from the classifies either. I have been burn 3 times out of 4 on there.

 

[97gstjosh]

For a cast manifold I have SBRs externally gated manifold.
Love it everyone I know hates it.
Its like $200 some odd dollars.

 

[casperfast]

12 psi on a 16g? hmmmm i didnt thin you could brake stall boost that high on these crs. i have the 14b on my 2g auto. i can do about 6-7 psi b4 my brakes cant hold the car or i start slipping forward. you will notice less "low end torque with the 16g than the stock t25. the t25 makes boost quicker than anything i know of. i noticed a verry large lag with my14b than with the t25. but it is faster at 12-14 on the 14b than the t25 morecfm at that boost level.

 

[97gstjosh]

12 psi on a 16g? hmmmm i didnt thin you could brake stall boost that high on these crs.

Oh you can

 

[97gstjosh]

12 psi on a 16g? hmmmm i didnt thin you could brake stall boost that high on these crs.QUOTE]

Thats when my brakes gave out
My trannys bein built by IPT now

 

[EagleTalonTim]

I have been able to build 12psi on the 16g at a launch but it is few and far between. That is why i was wondering if I was doing something wrong.