T2monster

Ok guys, i'm a/b to manually limit boost on my car, but i need to know what you guys consider to be max safe boost on stock (4 brand new!) injectors, fuel pump re-wire, all emmisions removed, HKS Super Mega flow, gutted DP and mid cat, y-back rx7.com 50mm exhaust (my God these mufflers are sweet AND deep sounding)DIY FCD, stock 101k engine and turbo, turbo in great shape (no wobble, no oil) and slightly retarded (1-2deg.) timing and 99 octane? I just got the a/f and boost guages, and this motor will have to last a while. What i'm asking is what can my fuel system, at its current point, handle? Also, i pulled the epoxy out of my rich/lean screw so i do have some minor adjustability.

P.S.
If you guys w/out cats
want cheap race gas, check this out:

http://www.vtr.org/maintain/gasoline-octane.html

Cameljoe

10 psi of boost is all about what the stock fuel pump can handle IMHO.

RETed

The fuel injectors run over 80%-85% pulsewidths over 12psi.
If you have the fuel system capacity (the stock fuel pump isn't enough), then I'd ay 12psi is max.



-Ted

T2monster

Thanks for the posts; until i get the Boost-a-pump or some other fuel setup, i'm manually limiting my boost to 8psi....any problems foreseen with this?

RETed

Um, how do you manually limit your boost?
I hope you saw my comment on the fuel injectors, right?



-Ted

NZConvertible

How? You can't lower boost unless you physically restrict the turbo. You can't do it with the wastegate.

You mean a single 50mm or splitting into twin 50mm? Either way that's pretty restrictive for turbo, especially if it's just a single

That's only for idle mixture, nothing else.

scathcart

Moderate right foot and a watchful eye would be my guess. There is no other way I know of, and if you don't, I doubt there is.
Sean

billzrx7

Ok here is my setup just for FYI and what happened to me.
Weapon-R Intake (JUNK JUNK JUNK)
3" catback custom built with resonators on 3" tips.
no cats (except in the downpipe)
stock injectors
no fuel pump rewire
10mm wires
TID mod

On an average IL night i run abou 10psi-12psi.. No problems to boot.

rx7_turbo2

Not yet anyway, how are you monitoring your A/F ratio? Are you using a S-AFC to add more fuel? If your not your just asking for trouble. I run 11psi and am using a S-AFC, I wont raise boost much past this with stock pump and injectors.

jspecracer7

Before I bought my FD, I had a TII with:

boost controller
S-AFC
full exhaust
intakes
RP fuel pump.

I ran that set-up in the hot Okinawan heat(95 degrees F with 80% humidity) for a full summer, railing on it day in/day out, ALWAYS on the throttle, with 100,000 kilometers on the engine, and I never blew my engine. I ran it like this for over a year, and the car ran sweet(well, maybe a little rich top end). I've seen dyno sheets of FC's with stock turbo/intercooler with 280 hp to the rear wheels(with a fuel pump/rising fuel pressure regulator) so it's safe to say that the car CAN become extremely fast with the right tuning

goodspeed

you just need to make sure you car is in good order, i.e. no major problems with the engine.

Im running 9-10 psi on cold night with midpipe, intake, fcd, super a-afc. I have my afc turned up approx 4% accross the board with the secondaries kick in and Im running fairly rich. I've never had a problem. I think the problem with blown motors is when people either don't have gauges to monitor what is going, or don't keep good maintenance, I think its easily possible to run 11-12 psi with full exhaust/intake. But if you dont change your oil, or have injector problems or other crap, of course your engine is toast.

I'm personally going to port the hell out of my wastegate and get an avc-r and hopefully set it at 10-11 psi w/maybe a small fmic.