I know this isnt a Honda specific question. Sorry guys There are a lot of great people who have a lot of experience on here though And just to start I am placing no blame on Boost Logic's product. They have great products

Now the bs asside. Setup is a 2JZ-GTE, Boost Logic transmission, 3800 stall, Innovative 76mm, Crower 272 (Stage 2- 3/4 Race), 3" downpipe, 3" exhaust, AEM EMS, etc. Need any more info please ask

Problem. When the Boost Logic went in the car would stall to 3000RPM - 3100RPM and build 8lbs. Not quite 3800RPM but it was fine. NOW the car wont stall past 2600RPM and builds NO boost. The car is a dog off the line

I will get a couple more logs and some video tonight. I'm asking for suggestions, opinions, etc. I'm thinking either the stall is hurt or something is amiss with the turbo Thanks to everyone that's willing to help

UPDATE AEM LOG FILES AND VIDEOS

AEM LOGS FILES: RENAME THESE WITH A .stf EXTENSION. MY SERVER WOULDNT ALLOW .stf EXTENSIONS

Log of stall

Log of stall less timing

Log of stall more timing

Log of stall same as first log but longer

Log of stall 2 step retarded

Log of stall 2 step retard rev higher

Log of stall 2 step retard rev lower

Log of stall from a stop

Log from a roll

VIDEOS: RENAME THESE WITH A .mov EXTENSION. MY SERVER WOULDNT ALLOW .mov EXTENSIONS

Stall up

Stall up AEM EMS parameters

From a roll

Stall up from a stop

From a roll


Modified by alpha at 8:25 PM 6/17/2008

 

Did you change anything from before or did it just start not hitting stall speed?

When you say won't stall past 2600 does the rpm stop going up or do you pull
though the brakes or do you have a trans brake?

Heat in the exhust is your freind as is a little retard..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RacerStev &raquo;</TD></TR><TR><TD CLASS="quote">Did you change anything from before or did it just start not hitting stall speed?

When you say won't stall past 2600 does the rpm stop going up or do you pull
though the brakes or do you have a trans brake?

Heat in the exhust is your freind as is a little retard.. </TD></TR></TABLE>

Thanks for the reply Steve

Nothing has been changed on the car. Exactly. Just stopped hitting the 3100RPM stall

The RPM stops going up. It does not pull through the brakes. No trans brake. I will take a video tonight

I've tried retarding the timing a bit at 2600RPM but it still wont stall up any more than 2600RPM. I will retard it more tonight when I take some video

Thanks again Steve!

 

Not sure if this is useful or not, but whenever we had a problem like this, the engine wasn't making as much torque. I assume you've already tested all the basics (boost leaks, compression and leakdown, etc.)? I still have fairly limited auto experience, but if a stall gets hurt, I think you'd have the opposite problem: you'd be driving throught it. i.e., I don't think hurt stalls get 'tighter'.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by servion &raquo;</TD></TR><TR><TD CLASS="quote">Not sure if this is useful or not, but whenever we had a problem like this, the engine wasn't making as much torque. I assume you've already tested all the basics (boost leaks, compression and leakdown, etc.)? I still have fairly limited auto experience, but if a stall gets hurt, I think you'd have the opposite problem: you'd be driving throught it. i.e., I don't think hurt stalls get 'tighter'.</TD></TR></TABLE>

Thanks for the reply Servion

I'm going to boost leak test it AGAIN, check the compressor/turbine wheels and compression test it AGAIN tomorrow. I'm still learning a lot about auto's myself but you're right. If the stall were hurt it should blow right through it. I'm lost right now with the whole issue. Maybe someone with more experience can point the right direction with that? If there is any way to hurt a stall and actually have it get tighter ...

Thanks again Servion

 

Generally speaking, if stall speed is low in every gear, the only two causes are a hurt engine or damaged torque converter one way clutch.

 

i dont think it is the tranny ,,like ya said it would blow bye the stall,and im pretty confident in saying that if their was anything wrong with the tranny it would do the complete opposite of what yours is doing ,,how old is the tranny?what fluid are you using?how does it feel when driving any other way?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jared &raquo;</TD></TR><TR><TD CLASS="quote">Generally speaking, if stall speed is low in every gear, the only two causes are a hurt engine or damaged torque converter one way clutch.</TD></TR></TABLE>

I'm going to check compression tomorrow but no signs the motor is hurt yet. Shoot me a pm some time. See how things are going up there

Thanks Jarad

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by h22 civic &raquo;</TD></TR><TR><TD CLASS="quote">i dont think it is the tranny ,,like ya said it would blow bye the stall,and im pretty confident in saying that if their was anything wrong with the tranny it would do the complete opposite of what yours is doing ,,how old is the tranny?what fluid are you using?how does it feel when driving any other way?</TD></TR></TABLE>

The transmission was built by Boost Logic about four or five months ago if I remember correctly. ATF IV Synthetic like Boost Logic recommended. It drives like it always has. Only thing that has changed is the stall rpm and load

Thanks h22 civic

Also, I updated the original post with log files and a couple videos. The videos are a little large because I can't compress them. Give them time to download I appreciate all the input guys


Modified by alpha at 8:37 PM 6/17/2008

 

Loss of stall speed could be the sprag, does the trans whine while trying to
build rpm? I'd check the line pressure in the trans too, higher pressures will
lower stall speed.

Try playing around with timing, you might need to advance it before you retard it
to get the r's up..

Last resort, a little 20-30hp dry shot to get it on the 2 step..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RacerStev &raquo;</TD></TR><TR><TD CLASS="quote">Loss of stall speed could be the sprag, does the trans whine while trying to
build rpm? I'd check the line pressure in the trans too, higher pressures will
lower stall speed.

Try playing around with timing, you might need to advance it before you retard it
to get the r's up..

Last resort, a little 20-30hp dry shot to get it on the 2 step.. </TD></TR></TABLE>

No whining or abnormal noises. No. Hmmm ... I will play with the line pressure some tomorrow if I have time. I dont think I have made any changes to the line pressure in some time

I've tried playing with the timing with no success. I've tried 10* retarded/advanced and even set the timing at -17*

hahaha. You sure you dont own an auto Supra Steve, lol

I've been discussing this with a couple of the Supra guys (Sound Performance, Boost Logic, John Reed, Errol at TPS, etc) as well. Almost all of them have suggested in one way or another spraying it, lol

Thanks again Steve

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jared &raquo;</TD></TR><TR><TD CLASS="quote">Generally speaking, if stall speed is low in every gear, the only two causes are a hurt engine or damaged torque converter one way clutch.</TD></TR></TABLE>

i was thinking it got loose. wondering if the converter is any good.

 

Guys. I appreciate all the input. This is why I love H-T and will continue to try and help others on here as well. Thanks again for all your input

I think we may have found the issue. Compression came back consistant on all cylinders. We're good there. It will be a couple weeks before we know for sure. I will update the thread then

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alpha &raquo;</TD></TR><TR><TD CLASS="quote">Guys. I appreciate all the input. This is why I love H-T and will continue to try and help others on here as well. Thanks again for all your input

I think we may have found the issue. Compression came back consistant on all cylinders. We're good there. It will be a couple weeks before we know for sure. I will update the thread then</TD></TR></TABLE>

What's the theory?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by servion &raquo;</TD></TR><TR><TD CLASS="quote">

What's the theory?</TD></TR></TABLE>

PM'd

 

So what was the deal?

 

I'm interested to see as well.

I have seen converters fail and not go through the roof on RPM, however, the car that did it, wouldn't even run once put in gear without a lot of throttle. Basically, it was almost locked up.

 

Can a stall fail two ways?Eithter lock up or spin?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Drag_S14 &raquo;</TD></TR><TR><TD CLASS="quote">I'm interested to see as well.

I have seen converters fail and not go through the roof on RPM, however, the car that did it, wouldn't even run once put in gear without a lot of throttle. Basically, it was almost locked up.</TD></TR></TABLE>

Did that turn out to be a problem with the tranny or the converter?

 

Converter. The turbine had pretty much completely fallen apart...