Boost curve

[Davis]

This may be of interest to some of you.

That's a 3rd gear pull.
Holset HE351
Mild porting
Center mount tube header
Ranger roller regrind with a little more lift
big FMIC
3" exhaust

 

[Gotta_gofast]

I like my charger because I've got all available boost at 1500rpm, lol. But you're most likely not towing and 4wd where you can afford to rev up to 4000rpm for brief bursts of full boost and acceleration. Post a video of how it behaves, I'm curious. 26+psi is a lot of pressure!

 

[Davis]

I like my charger because I've got all available boost at 1500rpm, lol. But you're most likely not towing and 4wd where you can afford to rev up to 4000rpm for brief bursts of full boost and acceleration. Post a video of how it behaves, I'm curious. 26+psi is a lot of pressure!

BAR is an absolute scale, so at my elevation, 1.85 bar is only 15 psi. And you are right, I don't tow at all.

I need to get a new, more detailed video, this is all I currently have:

 

[Gotta_gofast]

I assumed sea level for math...

My buddy runs a 2.3 turbo in his ranger. I ported his head and we have increased the intake valve 2mm. I should ask him what he runs for a turbocharger now, because he is able to spool up 15lbs right after 3000rpm (I believe 3250ish) and sustain that through 6000rpm. Maybe its just me being anal about how "soon" the rush hits. lol, some vids would be cool!

 

[Davis]

This is the result after some tuning and cranking the boost a bit.

 

[martin]

what did the horsepower and torque curve look like?

 

[Davis]

Not sure, never had it on a dyno.

 

[DCinDC]

I don't like that curve. It takes way too long to get in the boost. You're giving up a LOT of torque.

Unless you are a drag racer and spinning it to 8 grand, I would put a much smaller turbo on.

Boost pressure is a measure of restriction....

 

[Davis]

I don't like that curve. It takes way too long to get in the boost. You're giving up a LOT of torque.

Unless you are a drag racer and spinning it to 8 grand, I would put a much smaller turbo on.

Boost pressure is a measure of restriction....

I know all of these things....

I wish is spooled sooner. I used to run the IHI turbo from the 87-88 T-bird. That turbo spooled really quickly. But it ran out of steam really quickly and can't move more than about 250 RWHP worth of air.

Keep in mind that I am nowhere near the boost/flow limit of this turbo. It'll push 38 psi relatively efficiently and flow enough for 450-500 RWHP. So no, I'm not utilizing this turbo to it's max potential, and I know that.
And yes, you have to flog it to get max performance, and it's not for everybody, but when the boost is turned up to 27-28# it's an absolute screamer.

 

[n_grimm]

I ran a Holset HY-35 which I thought had a similar exhaust housing but I'm pretty sure full boost was at least 1k earlier on a my 2.3 Mustang. Any chance you have either have an exhaust leak pre turbo or the wastegate is leaking?