Hey all,
I am curious at what level everyone finds the stock LT4 cam seems to become a limiting factor.
I have done about 10 Magnuson 2650 cars with stock cams so far. I am able to get 800-830whp running around 16psi of peak boost. This equates to 140-144mph trap speeds. I am at altitude so my dynojet regularly corrects 11-15%.
I have also done 3 cars with the same mods plus BTR stage 3 cams and they can make 1000whp+ quite easily (i haven't pushed much over this but all indications point to more not being a problem.) This is at 18psi. unfortunately none of these cars have seen a track yet so I cant comment on mph.
However, I am wanting to push the blower a bit harder with the stock cam so I am working on a car atm that is a manual, has meth injection, low side aux pump and c16. In addition to the regular LTH, cat delete, Magnuson 2650R, 103mm TB, upgraded icebox and heat exchanger that the cars listed above have. So far I am making 20psi peak but not making any extra power.. This car originally made 801whp, with 4psi extra boost and C16 I am unable to get over 820whp. Something does not seem right to me here. I have played with cam timing and injector timing and nothing seems to make a significant difference. I am not running out of low side pressure, it is 70+psi the whole run. I am able to maintain my target high side pressure of 20MPA as well.
So I am wondering, have I simply hit the airflow limit of the stock cam? Is it unable to ingest anymore air hence why my boost numbers go up but no corresponding power increase?
Thanks in advance!