St205 dyno'd and boost queswtions etc:)

[TRDmod]

ok

st205 1996
mods: cold air bos, replumbed BOV, apexi superflow filter, battery to boot to put the pod straight to the side with less than 1.5 feet of pipe (3 inch)

i also have a hks 3 inch cat back


i went on the dyno, no other mods and i got 164.8 KW at the wheels and has reached a peak boost 13.8psi, though the boost curve was highly eratic...it had a boost average of bout 12.8 jsut out of estimation and self calculation..

now my AF ratio was 10.8, these cars run rich!!

now as far as i know, rich means it will prevent detonation at slightly high boost, which means i have a margin on more boost...is that correct or wrong?

also, i am planning on gettign a elec boost controller by g-reddy, but i want to know, when i do take it to the track, what is the safe level of highest boost i can put on it, i mean what can the engine handle in terms of highest boost and what can the ceramic turbo handle safely, cos im sure there are two limits we must take into considerations here...

i was thinking of doin the high boost settign flat o0n 1 bar, and i was thinking of doing the low on standard which is about 12.5psi...

please feedback and comments....gt4 owners...GT4 ICHI BAN!!!!!!!!

[EVLGTZ]

By having a/f ratio of that level your most likley losing power throughout the rev range. Sure its safe as houses but your much better off with a bit less fuel in there. Will also find when ya lean it out a bit more that it'll accelerate much more crisply.

Any idea why it's running so rich?

Eratic boost curve doesn't sound too good either. What are you currently using to control boost levels? a bleed valve?

[Wildcard]

TRDMod, safe boost levels for latter model 3SGTE's has been covered quite extensively on the board in the past, as with a lot of your posts you might want to do a search on the board first as this will solve you time in answering many of your questions.

As an aside, I got a copy of the Rev3 3SGTE Toyota engine supplement recently and in this the 'acceptable boost levels' were from approx 0.85 to almost 1.2bar. This doesn't mean running these levels were entirely safe but its interesting to see that Toyota believed this level of boost to be 'in spec'.

[TRDmod]

i jsut cant find posts about them, i cant seemt o find the right articles, sorry
so i jsut asked again
but everyone has changing opinions and some dont know facts just rumors and hear say...

but anyways
thanks anyways, ill read rev then ay

[Wildcard]

Well, my comments are really just trying to help you as you will note that many pearls of wisdom on tech topics are often only repeated on this board once, therefore if you just blindly ask again you may miss something important.

These threads are certainly a start:
viewtopic.php?t=27152&highlight=boost+ct20b
[Caldina stuff but Fivebobs posts later in the thread are very interesting and relevant to the Rev3 3SGTE as well]

viewtopic.php?t=26598&postdays=0&postorder=asc&highlight=boost+ct20b&start=0
[Nemesis's posts]

In essence, for extended thrashing the stock setting of ~0.9bar is probably best....

but anyways thanks anyways, ill read rev then ay

Well - if your not willing to try to help get better answers to your questions - please do

[Scottie]

Hey Wildcard, are you able to put the 'Rev3 3SGTE Toyota engine supplement' up somewhere, or is it in the current issue and I should go buy it.

[Wildcard]

Hey Wildcard, are you able to put the 'Rev3 3SGTE Toyota engine supplement' up somewhere, or is it in the current issue and I should go buy it.

Here you go:
http://andrewmcc.com/bgb/3S-GTE%20ST205%20(rev3)%20engine%20supplement%20RM398E.doc

And also the chassis manual supplement for the ST205:
http://andrewmcc.com/bgb/repair%20manua ... RM399E.doc

[flygt4]

if you're running that rich it may pay to look into an apexi S-AFC. a friend of mine dynoed 165 odd kw on his evo , had it tuned with an safc and it shot up to 195 odd he had upgraded his fuel pump tho so may hav had something to do with it. its a pretty cheap mod , the older model safc's (with knobs not bling blue dials) can be picked up really cheap nowadays , and it only took 15 minutes tuning by someone who knows what they are doing to get it set up.

id say that would be standard boost wouldnt it?just helped a bit by filter and exhaust.

[Lloyd]

Bear in mind that running excessively rich can lead to bore wash which you really dont want...

[Al]

Bear in mind that running excessively rich can lead to bore wash which you really dont want...

10.8:1 isnt excessive compared to the US spec 3sgtes!

[GT4 20]

According to the GT4 OC website in the UK, you can safely run up to 17psi on the stock ECU. I'm running just a shade under that on mine with a GReddy Profec B spec II with no problems (TOMs panel filter and turbo back decatted exhaust) - though I do have a turbo with steel internals . I understand that the boost cut is at this level - get a fuel cut defender and you should be able to go up to 20 odd psi. AFAIK, the pistons are the weak link - rods are good for much higher levels.
Though if you're going to run those sort of boost levels you'd really need to seriously consider a FMIC.
Gary

[evltoy]

I put my 1994 ST205 on Torque performances dyno on a PCM dyno day.

Totally stock standard with standard exhaust and air box. Running 11.8psi it made 164Kw@wheels, and had the exact same air/fuel ratio of 10.8 as yours.

Your engine could be a little tired. How many Km's has it done? Run a compression check may be?