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Old 09-10-2021, 09:58 PM   #10
snow_bound26
Scooby Specialist
 
Member#: 395793
Join Date: Jul 2014
Chapter/Region: Tri-State
Location: SLC and Lake Placid
Vehicle:
2005 92x Aero
Beige

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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Thank you!

The drive home will be a little cautious since I'll have the old 5MT swap and lots of parts in the trunk

I was planning to move the red-line no further than ~7400 - Stock fuel cut is 7200. I am just worried the power-band will be very narrow with the large exhaust housing and no AVCS. And I have heard of people extending red-line out to 7500 on the 205 without issues but I understand the cams/ports aren't efficient past ~6.5K.

My thought process is ~300 RPM more of usable torque may be justifiable if spool is super late, even if it's not necessarily making more power. Especially on pump gas. I am not expecting power on pump gas before 4500, so I am thinking bumping the red-line a tad may be worth it. Especially because I won't be banging off the limiter often anyway, and the motor is going to get built soon anyway (well not this motor, but A motor).

This thread is similar to my setup in a few ways, like the EJ205 (although mine isn't built), the turbo (the 1.5XTR and 20G-XTR are the same turbo aside from the compressor wheel), no AVCS, and it's on pump gas.

Spool was pretty bad.


That cam profile is the main reason that it spools so slow. Those aspects need to be acknowledged when looking at builds that seem similar to yours.

Valve float is the issue with the 205. The cams can handle 7500, it's the springs that have an issue going past 7000 with 22psi+. On pump gas you'd probably end up 20-21psi, but on E85 you might end up around 24psi.
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