Is this HP estimate reasonable?

[alpine615]

I was reading the Tech Articles section on the main Stinger site. With the mods I have planned (see my signature) I seem to be between these two ranges;

-Above setup plus ported or gutted intakes, mildly ported head, ~22-23 psi will produce roughly 265-300rwhp.
-Above setup plus professionally ported head flowing 215+cfm on the intake, extremely high fuel pressure, ~22-23 psi will produce roughly 275-315rwhp with very high base fuel pressure (or run larger injectors, turbo, and a tuneable ECU like our PiMP and it could be 300-345rwhp).

So I wasn't planning on porting the head or upgrading the cam (yet), and I was thinking of staying at 43.5psi for fuel pressure. However, I am planning on using larger fuel injectors (either 60# or 80#) on 93 Octane fuel, so if I were to guess how much horsepower I'll see at the wheels, I'll take a stab and say 275-300 rwhp. 1) How close is this estimate, and 2) how much additional HP could be gained from a mild head porting and a better cam, say a BoPort 1.5? Going fast with the best streetability possible is what I'm going for. (PS - What psi "extremely high fuel pressure" be?)

[Stinger]

No signature attached?

[alpine615]

Weird, I was pretty sure it was showing up on my computer, but it’s not showing up on my iPhone.

Pasted from my profile:

80 Pinto w/ 2.3T, stock head and exh manifold, Ranger Roller cam, gutted/rotated upper, ported lower, 65mm TB, FMIC, T3/T4, C4 auto, 8" rear. Plans for full 3" exhaust, 80 lb injectors, 3/8" supply and return lines to a 255 lph in-tank pump running pump gas, all to be controlled with PimpX.

[Stinger]

Those power estimates are a "best case scenario" so they are on the high side of what's normal.

Stock head setups are often held back by valve seats that are worn out and leaking. They are surface hardened from the factory but after 30 years of use they are often worn through the surface hardening.

I'd expect your setup to be anywhere in the 225-275hp range depending on the condition of the head and how much boost you're able to get away with safely running (which depends on fuel octane and many other factors).

[alpine615]

Thanks Shannon. I should have mentioned that the cylinder head was professionally rebuilt (just not ported/polished) many years ago by a reputable machine shop. I had work done on the block at the same time, having it hot tanked, magna fluxed, decked, and overbored at 0.030"... I then rebuilt the shortblock myself from a master engine rebuild kit that contained forged pistons. But back to the cylinder head work, I'm not sure if that would have any major effect on the estimates you provided, but I thought I should mention it.

[Stinger]

Did they install hardened valve seats or did they just do a valve job on it?

[alpine615]

Hmm, it was so long ago I don't recall. I'll look to see if I have any invoices and get back to you.

[alpine615]

Well, I never did find any proof that the machine shop I used (now closed) installed hardened valve seats. But as my project has dragged on, I've been eyeing bigger upgrades. If I ditch the stock head and cam in favor of a Boport Stage 3 with 2.1x cam, would you be able to provide me with an updated HP estimate? (My signature showing important specs has been updated.)  Thinking I should be at or north of 300hp... thanks in advance!

[Stinger]

A stage 3 head and 2.1 cam should add about 25% more power to the combo if it's all dialed in properly.

A datalog of a full boost pull can allow us to estimate HP pretty accurately using duty cycle, AFR, and RPM.

[alpine615]

Good to know what to expect. I still have to get the exhaust done, but hoping to get the car running by year's end (I've said that every year for the past 3, so don't hold me to that.)