minerdude1

So I just got done putting the new turbo on my pickup. It is a factory 86 turbo pickup, and the original ct20 turbo was shot, especially after 216k miles. I got a home made manifold with a standard garrett t3 flange on it, and threw a garrett super 60 on it. I bolted on a internal gate housing and wastegate from a old saab, and now I am hitting boost cut. The engine boggs down bad, and CEL comes on, which is normal for fuel cut. I was wondering if anyone knew of any way around the factory boost cut, or how to raise it without buying a boost cut eliminator?

minerdude1

does no one know any solutions to this? It only happens on heavy throttle, but on partial throttle, it does not do it very often

khoopes

This is an old post but the 22RTE stock can only handle about 14psi boost before it shuts down. Sounds like you need an aftermarket fuel management system and possibly larger injectors.

space-junk

iTrader: (1)

i was under the impression that the turbos only came in 4runners...

BoostedRNR

There is really no safe way around fuel cut without going with a stand alone efi system. I would buy a boost controller and lower your boost to ten pounds max. You will most likely blow your motor up pushing more than that.

saitotiktmdog

Agreed

white87yota

no they are also in the pickups

scuba

Im under the impression you dont know your yota faq...


/me ducks from thrown coil spring

space-junk

iTrader: (1)

i cant throw my coils at you just yet ,scooby... my OME901s arent here yet...

hmm... its funny... because before joining here, i never even knew about a factory option for turbo in toyotas...

interesting...

fivesfe

a boost controller wont lower your boost any lower than the wastegate has it set.

this is my first post on this forum, but i know a bit about turbo cars.

how much boost are you running, do you have a boost gauge? A super 60 flows a whole lot more air than a ct20 does even if their at the same boost levels, ur injectors are probably having some trouble keeping up.

source out some larger injectors, im sure there is something from another toyota vehicle that would work, (ive used n/a supra inj on a 5sfe celica).

then pick up an apexi safc, to tune it. i bet it will take care of your issues, if not then look into upgraded maf options.

abecedarian

the fuel cut is caused by a couple of things all happening at once:
throttle opened to a wide angle and the air-flow meter reaching full-open.
You don't get the cut at low-boost / part throttle because the AFM isn't saturated (maxed out on flow).
at that point, the ecu has nothing to determine how much air is entering the engine and is also maxing out the duty cycle of the injectors so it cuts the injectors to lower the rpms and boost thus causing the afm to return to normal operation.

One way to 'hack' around it is to tighten the spring in the afm, which causes the ECU to think there is less air getting into the engine thus shortening injector duration, and then installing higher flow injectors to add the extra fuel the ECU thinks it's cutting back on. The down side is that lower rpm operation will likely suffer from a rich mixture. Also, improperly chosen injectors or misadjusted afm can cause the ECU to not be able to adjust properly to the O2 sensor readings.

BoostedRNR

Yea my bad on thinking a boost controller will open the wastegate sooner than what the wastegate is set at. Is the wastegate binding?

stagger_lee

Too much air and not enough fuel = BOOM!

I am not sure how toyotas ECU works on there turbo cars, but every time I did some upgrade on my Subaru I had to get a tune. Intercooler, tune, injectors, tune, Turbo, tune. The tuner could usually just adjust my map.

saitotiktmdog

[QUOTE=fivesfe;51028941]a boost controller wont lower your boost any lower than the wastegate has it set.

QUOTE]
Doesnt that depend on the wastegate. I believe mine has that capability. There are two vac hook ups on mine. One above and one below the spring diaphram.

mistreatedtoys

Was that "hack"a shot at me there Abecedarian? Just kididing.

abecedarian

No... why would you think that? hehe

annoyingrob

If you're really creative, you could hook a vacuum accumulator to the top port to lower opening pressure, but that would be really hard to control. In general, the lowest pressure a wastegate can operate is the spring tension applied to it. His best bet is to replace the wastegate with the stock one.

Another interesting, but likely insignificant fact, the 22R-TE ECU actually cuts fuel at a specific airflow, not at a specific pressure. Saying it will cut at 14psi may hold true for the stock turbo, but with a bigger flowing turbo, boost cut could occur much lower, say 8psi.

The best way to raise boost cut is to first install a larger AFM (Like from a 5M), then install proportionally larger injectors. This is done quite frequently in the Supra world, upgrading the 7M-GTE AFM with one from a 1UZ, then upgrading the 440cc injectors to 550cc. The problem is that you MUST make sure you are increasing each equally to ensure you don't run too lean. If in doubt, err on the side of larger injectors.

vwfastg60

management or at least tune it. Your in CO and my buddy that lives in longmont builds megasquirt set ups. Foe now i think you trick the maf if you cant turn the boost down. you need to get it on a wideband and tinker for now tho.