What's restricting my engine?
#1
What's restricting my engine?
I've been on the dyno and got a healthy 200bhp at the fly from my supercharged 1.8 96 miata but on every run the car would start to slow down the build up of revs until about 6k where it took off again.
We bypassed the supercharger and had a run on the dyno and the car displayed the same behaviour.
The tuner things that the timing looks good throughout and the AFR's where stable and hitting the right marks for the amount of boost. I've also changed exhausts and it's still there.
It feels like something's opening up at 6k but i've no idea what. Any idea's on what could be moving?
We bypassed the supercharger and had a run on the dyno and the car displayed the same behaviour.
The tuner things that the timing looks good throughout and the AFR's where stable and hitting the right marks for the amount of boost. I've also changed exhausts and it's still there.
It feels like something's opening up at 6k but i've no idea what. Any idea's on what could be moving?
#2
You're looking at this the wrong way. It's not what's restricting, it's what's giving you extra torque at the lower RPMs. Your intake manifold has tuned runner lengths that give you "free" supercharging at certain RPMs. Unfortunately, ram tuning doesn't work across the whole RPM range. Do an internet search on ram tuned induction. I get a huge kick out of the early-60s Chrysler BB intakes. Wild stuff.
A true, passive restriction would show up as a torque and HP fall-off at high RPMs. It would be related to air flow and nothing else.
A true, passive restriction would show up as a torque and HP fall-off at high RPMs. It would be related to air flow and nothing else.
Thread
Thread Starter
Forum
Replies
Last Post