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Discussion Starter #1
Hello all,

I have a blacktop zetec in an old escort. Mods are as follows:
Stock motor except..
JE pistons, eagle rods
Newman valve springs, chromemoly retailers
Deka 800cc injectors
Megasquirt ecu, innovate mtx wideband
Custom stainless inlet manifold
Custom exhaust manifold
Mamba GT2871r BB turbo
Tuned on e85
Last dyno run I made 234rwhp on 13psi on e85. Had fuel delivery issues.

What is the limit on the standard head? Maybe 340rwhp with a good tune?
 

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The head is not setup for high revving g without some spring work. That and the valve size. It's not about if it can make more power it's where in the rpm typically. I have had customer motorcycles that made 100 HP at 7000 tons and then others that had to hit 10000 tons

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Discussion Starter #3
I expected valve flutter at 13psi boost but it was fine. Once I install the stiffer valve springs I will increase boost.
 

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Plenty have done 400 and better on full stock Zetec head and cams.

Ported will offer performance with less boost pressure needed, but it won't restrict it to the point of keeping the build from moving forward.

234whp is nothing, especially on E85. Turn it up. You don't need stiffer valve springs to do that, especially if you have already uprated them once.

The happy number on 93 was always 270whp for a full stock Zetec. You have rods and pistons, you've fixed the only weak link in the stock engine. With enough fuel pump and injector, you can max that 2871 out(400ish whp) without touching the head or cams further.

- Drew
 

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Drew, love the info you still bring to this site. I know you talked about this before, but you think I'd be safe at 15psi on my
stock engine? I probably would get it on a dyno first before cranking the boost, just to see what I'm making for power
right now. I want to do it anyway. I trust the tune 100%, but I would talk to Raffi to make sure he is able to program
for that boost level which I'm sure would not be a problem.
 

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Drew, love the info you still bring to this site. I know you talked about this before, but you think I'd be safe at 15psi on my
stock engine? I probably would get it on a dyno first before cranking the boost, just to see what I'm making for power
right now. I want to do it anyway. I trust the tune 100%, but I would talk to Raffi to make sure he is able to program
for that boost level which I'm sure would not be a problem.
Which turbo is in your FSW kit again? It's strictly going to depend on if you can keep the torque peak off the midrange.

If you can keep the torque peak above 4000rpms, then i'd assume you could live a long healthy life north of 270whp on 93.

And thanks, I try to find my way back a couple times a week, unfortunate there is so little activity.

- Drew
 

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Which turbo is in your FSW kit again? It's strictly going to depend on if you can keep the torque peak off the midrange.

If you can keep the torque peak above 4000rpms, then i'd assume you could live a long healthy life north of 270whp on 93.

And thanks, I try to find my way back a couple times a week, unfortunate there is so little activity.

- Drew
Ah, I see. The turbo is a GT28 journal bearing turbo rated for a max of 330hp. It has a .86 a/r exhaust housing
and spools up around 4000rpms WITHOUT the aid of boost controller keeping the the wastegate shut till a certain
psi level. I believe it spools at around 3700ish rpms now at the setting I have my e-boost street set at. I would
more then likely get it on the dyno first to see where the torque peaks before I turn it up, if I do.

And your welcome. :) I hear you on the activity. It is a sad thing. :(
 

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GT28 is sort of broad, but with a .86 housing i'd assume is a 2871/76 or something similar.

3700 isn't bad, my old GT2560R would full spool 2700RPM, that's the kind of midrange torque that will bend rods if turned up.

Get it on the dyno, schedule a day when the tuner can be ready for you, then you can datalog and turn it up while you're on the dyno, so you can keep it to a safe level.

- Drew
 

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Well I'm only saying what is on the box and and on FSWerks website for what the turbo is. It is a journal bearing
unit to keep the cost of the kit down I assume. Here is a picture of the box.




Yep, 3700 is pretty good actually. I love the midrange powerband of this kit and am very please with it. FSWerks must have
chose that .86 a/r for a good reason so I don't question it. I trust them. Good idea on the dyno. I will have to do that,
if I decide to turn it up.
 

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You can look at the logs and see where peek TQ is just look at the " Load " same as what you see at TQ on a dyno graph

I wouldnt go over about 250hp , datalog see what the AF is and if you have any knock timing retard and go from there , I target 10.8 AF WOT after 3000 rpm

Tom
 

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Discussion Starter #11
Big thanks to the replys! I'm installing the valve springs at the moment. Tossing up on wheather I should install billet oil pump gears. My next limitation will be the 044 borsh pump and 80ibs injectors. Id say max 350rwhp.
 
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