xB final drive swap

[fnkngrv]

Originally Posted by Jason@SportsCar

Then you need to fix your problem, and get past the OEM rev limiter. How can you make a serious attempt at power gains without ECU control? It is not cheap, but there are solutions, and power to be had.

That's part of the plan, but I wouldn't dare to run up the rev limiter on a stock bottom end anyway at the speeds that I am attempting.

[Jason@SportsCar]

Originally Posted by fnkngrv

That's part of the plan, but I wouldn't dare to run up the rev limiter on a stock bottom end anyway at the speeds that I am attempting.

I am 7300 all day long on a stock bottom end (rods/crank/pistons even valve springs).

[fnkngrv]

Originally Posted by Jason@SportsCar

I am 7300 all day long on a stock bottom end (rods/crank/pistons even valve springs).

If not mistaken you are not running forced induction though. The stock internals with the stock rev limit placement can handle only 10psi really as what has been found for any period of time. I was running 8psi which gives a little more wiggle room for stability, but I would hazard a guess that running boost and changing that limiter on a stock bottom end would not necessarily last you very long.

On the flip side the motors are so cheap that if you had one tank as long as it didn't happen during the high speed passes then it wouldn't "hurt" as bad. Let's hypothesize that I moved to a full standalone and bumped the limit to 7300rpm with 8psi of boost and it netted me as a number out of the blue at 155mph and the rods let go at 7000rpm going that 155mph I would think that would be a dangerous and really bad thing.

Anyway, I don't mean to detail your thread with all of this info...your contributions are great with this and just teaches me that I need to learn more about the gear ratios with this engine/tranny combo for sure.

[speed1]

Originally Posted by Jason@SportsCar

I am 7300 all day long on a stock bottom end (rods/crank/pistons even valve springs).

Hello Jason,
I have 2003 echo hatchback (vitz rs) 1nzfe race built.
Is that in picture your vitz car?
Can tell about cams duration e lift + gear set e final?
Maybe (22-62-62-22/9,5) cams + KAAZ close gears e 4.3 or 4.6 final?
Maybe TRD 33030-AE001 gear set + 4.3 or 3.7 final?
I read 145hp at 7250 in web commercials......
Great job.