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View Full Version : cold engine stumble fix and turbo boost increase on st165 with st185 engine



shreddr69
05-02-2012, 07:01 PM
So I found this fix for the cold morning stumble where you locate and retard the AFM idle screw a couple of turns and it is suppose to smooth out the rough running in the morning when the engine is cold. Once this has been performed, you remove the EFI fuse to reset the computer. I think the car has to relearn because my car had a little bit of a hard time starting this morning. I am mainly wondering if anyone has heard of/ done this mod and if there are any drawbacks or negative effects to it? I will post a link if anyone is interested.... Also, I am boosting 15 psi on my st185 engine but I am using the stock st165 intercooler. Is this bad? What would or could you folks recommend to keep my oversized turbonetics turbo system functioning at maximum efficiency? The intercooler pump runs constantly but should I try to get the st185 RC intercooler? Any tips would be most helpful, thanks!!

4thgenceli
05-02-2012, 07:05 PM
tl;dr
np;dr
wot;dr

I'm sure there's good information there, I just can't find it.

Luni
05-02-2012, 09:04 PM
Our ECUs are non-learning. So, basically once the ECU goes through its initial scan of everything, decides on octane, and a fuel map, etc, it locks itself there. They dont take any time to really learn.

shreddr69
05-02-2012, 10:50 PM
I see. Do you know, or have you done this mod before? Is it viable?

schnee
05-03-2012, 09:39 AM
Not to be a killroy but 15psi on stock pistons and injectors always results in the same symptom -
#3 piston cracks and if you're lucky it only destroys the bore
http://i493.photobucket.com/albums/rr292/_MrMagoo/Cars/Toyota%20Celica/Kevs/GT4/PA260424.jpg

Sounds like you've made changes under the bonnet too, my advice is to get it tuned by a pro

Luni
05-03-2012, 06:30 PM
What mod are you talking about? The turning of the AFM screw? Yeah people do that, be careful though, it IS changing your AFR/timing values. It would be better if you had a wideband to verify what you have.

shreddr69
05-04-2012, 02:49 PM
I will turn the AFM back to stock. So the car makes between 10 and 14 psi. depending on how hard it's pushed. I don't drive too hard but I'd like to be more comfortable doing so. It was my understanding that a stock st185 motor could take up to 17 psi of boost, is this correct? Is there anyone who could assist me in tuning it? A shop where they know what's up with these cars?? I'd hate to blow it up, since I just got it running, smogged and registered! Plus it does burn some oil. I'd rather beef it up then blow it up. Where would be a good place to start?

shreddr69
05-04-2012, 09:04 PM
Sounds like you've made changes under the bonnet too, my advice is to get it tuned by a pro[/QUOTE]

what is the bonnet? Sorry, I'm just ignorant to what this means....

4thgenceli
05-04-2012, 09:16 PM
what is the bonnet? Sorry, I'm just ignorant to what this means....

For those who are not exposed to other various cultures and languages....hood.

Galcobar
05-04-2012, 09:27 PM
For those who are not exposed to other various cultures and languages....hood.

:downsowned:

That other language in this case being English -- and a bonnet serving the same head-covering purpose as a hood on people.

shreddr69
05-04-2012, 10:39 PM
tehe tehe, got it! So how about the boost capacity of a stock st185 long block. Is it 17 psi or will that cook the bottom end?? Thanks!

schnee
05-05-2012, 10:44 AM
Here we go again........ thankfully it's not in the boot or cubby :nuts:

Not to be a killroy but 15psi on stock pistons and injectors always results in the same symptom -
#3 piston cracks and if you're lucky it only destroys the bore
http://i493.photobucket.com/albums/rr292/_MrMagoo/Cars/Toyota%20Celica/Kevs/GT4/PA260424.jpg

Sounds like you've made changes under the bonnet too, my advice is to get it tuned by a pro

4thgenceli
05-05-2012, 05:03 PM
^^ At first I was like WTF double post?

Then I was like :ooohhhhhh:


IIRC 13 or 15psi is about tops for the 2nd gen. The 4th gen is around 18/19.

shreddr69
05-06-2012, 01:39 AM
Ok, so 13-15 psi is where I'm at. I go through about 1/4 quart of oil every two gas fillups. Is that normal? or normal-ish??

shreddr69
05-29-2012, 12:05 AM
tl;dr
np;dr
wot;dr

I'm sure there's good information there, I just can't find it.

what?

Galcobar
05-29-2012, 02:30 AM
He's attempting to not-so-subtly suggest that your initial post is poorly formatted and fails to separate useful information, speculation and questions.

shreddr69
05-29-2012, 04:34 PM
OHHHHHH, sometimes the car gets me flustered and I don't exactly know where to start with my questions. Sorry....