Abbott-tuned, hitting fuel cutoff (I think) - SaabCentral Forums
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  #1  
Old 10th October 2012
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j006 j006 is offline
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Default Abbott-tuned, hitting fuel cutoff (I think)

Sup guys. I bought a tuned 9000 Aero back in May which ran fine, but had some low boost issues. Turned out it the the BPC valve which I replaced and now it boosts 1/4 past read on WOT. Great, I say! The problem is that I'm hitting fuel cutoff at times, and the boost pulses some when I'm really getting into the throttle. I'm not sure if the guy before me upgraded the FPR or not; could this cause this? Furthermore how can I tell if it's the upgraded one or not?

I'm pretty sure the injectors are the same; I'm kindof blind as far as what stage the software is actually at, but it walks my 9-5 Aero so I'm guessing it's at a stage 3. Hardware is big Abbott intercooler and delivery pipe, Forge recirc valve, K&N intake, 3" downpipe and exhaust.

Unfortunately, the guy had to sell the car because of hardship, and he was very emotionally attached to it. He was really sad to see it go and entertained some of the questions I had early on after I got it; ultimately he said he had to move on in his mind so I didn't contact him anymore because it was clearly upsetting him.
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  #2  
Old 10th October 2012
VT9000CSE VT9000CSE is offline
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I turned off my fuel cut in overboost on my T5 Suites tuned Stage 3 ECU. Much better. It overshoots past full red then settles in nicely. I did the T7 valve conversion.
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Old 11th October 2012
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Could be a sticky APC/BPC valve. Ws it a new one, if not, have you cleaned the ports.

http://forum.ecuproject.com/showthre...aning-a-T5-BCV

YOu should not get to fuel cut.
It means something is wrong, far too much boost or something radically wrong with the tune and the ECU can not get the knocking under control so cuts the fuel to save the engine.
It the last resort for the ECU to save the engine.
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Old 11th October 2012
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KaMiKaZi_t0M KaMiKaZi_t0M is offline
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Some people mistake fuel cut for knock, I hope you are not mixing up the two. Knock is a tad bit more detrimental than fuel cut!
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Old 11th October 2012
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Quote:
Originally Posted by KaMiKaZi_t0M View Post
Some people mistake fuel cut for knock, I hope you are not mixing up the two. Knock is a tad bit more detrimental than fuel cut!
Good to see you are still on here KaMikaZi_tOM.
I've never really figured your name out, but seems to me like you must have some exciting driving techniques!

"knock" sure can be detrimental.

I think Yes and No to this post.
I was a bit unclear in previous post.

Fuel cut is the last resort for saving the engine from dangerous, "knock".

If the engine gets into knock, the first thing the ecu does is
richen the fuel, (this cools things)
second, retard the timing,
third pull off the boost.

If for some reason the enigne keeps boosting too high then the ECU senses the high boost and cuts the fuel.
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  #6  
Old 11th October 2012
John Z Williams John Z Williams is offline
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From the ones I have seen, they turn the fuel cut up, but not off, so it sounds like the bpc could be over-boosting, you need to get a boost gage on the car and see what its actually boosting. Should be around 20psi. If its more, then you have a sticky bpc, they go bad all the time or your base boost is set too high or your wastegate actuator is damaged.

It could be quench or weak fuel pump too, have seen this, you need a new set of ngk bcpr 7es plugs with the .75mm plug gap !

I saw some early abbott tunes and they were the forge 10psi actuator and then they would turn off the fuel cut and that was it.

All three of my Saabs had weak fuel pumps, two 9000's and on ng900, the air fuel would lean out from the weak fuel pump. My 9k aero would run 14.2 under wot, new fuel pump, 11.5 :-)

John
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Old 13th October 2012
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Well this problem is moot for the moment. Car won't start :mad:

I've got another thread about it here.. Thanks guys.
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