Paging Roadie or 97WS6Pilot
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Joined: Jan 2003
Posts: 799
From: Breese, IL
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Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Registered User
Joined: Jan 2003
Posts: 799
From: Breese, IL
So, I've been away from trying to fix my car for a little while, but got back on it at the end of last week... JC at Delteq and an engineer at FAST both are aware of my problem are are looking into it. Since everything looks good with the cam signal and FAST, we're going to shoot for a fix with the Delteq box first.
JC at Delteq just overnighted me a couple different revs of the Delteq brain box to try out and see if we can find one that works... Talk about great customer service!
I'll know sometime tomorrow evening if this helps.
JC at Delteq just overnighted me a couple different revs of the Delteq brain box to try out and see if we can find one that works... Talk about great customer service!
I'll know sometime tomorrow evening if this helps.
Thread Starter
Registered User
Joined: May 2001
Posts: 233
From: Ewa Beach, Hi USA
Good to hear Roadie. Hopefully between the few of us who are experimenting with this combination, one of us is bound to figure it out. I'm still waiting on JC to send me my harness that will plug into the FAST harness. Just got my rotating assembly and block back from the machine shop today. Soon as I get my heads from AI, I'll be getting her put back together. See ya, Rob.
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Joined: Jun 1999
Posts: 972
From: The Haven, Fl
Well JC sent me another brain box too but it didn't work. 
I just got done ordering a Crane HI-6R, PS92 coil, adapter harness and plug wires. I hope one of you have better luck and figure it out. I've been down 2 yrs now and the patience has run out esp w/ only having one year left on the autobahn. I cracked...sorry fella's. I'm still going to keep the Delteq in the event there is a cure as I really like the damn thing.
RealQuick sorry for not shooting you a datalog.
I just got done ordering a Crane HI-6R, PS92 coil, adapter harness and plug wires. I hope one of you have better luck and figure it out. I've been down 2 yrs now and the patience has run out esp w/ only having one year left on the autobahn. I cracked...sorry fella's. I'm still going to keep the Delteq in the event there is a cure as I really like the damn thing.RealQuick sorry for not shooting you a datalog.
Registered User
Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Well JC sent me another brain box too but it didn't work. I just got done ordering a Crane HI-6R, PS92 coil, adapter harness and plug wires. I hope one of you have better luck and figure it out. I've been down 2 yrs now and the patience has run out esp w/ only having one year left on the autobahn. I cracked...sorry fella's. I'm still going to keep the Delteq in the event there is a cure as I really like the damn thing.
RealQuick sorry for not shooting you a datalog.
I just got done ordering a Crane HI-6R, PS92 coil, adapter harness and plug wires. I hope one of you have better luck and figure it out. I've been down 2 yrs now and the patience has run out esp w/ only having one year left on the autobahn. I cracked...sorry fella's. I'm still going to keep the Delteq in the event there is a cure as I really like the damn thing.RealQuick sorry for not shooting you a datalog.
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Joined: Jan 2003
Posts: 799
From: Breese, IL
no luck with the first of the three boxes he sent me... Everything is too hot for me to swap and try again right now.
http://www.lt1.org/turbo/miss1.gif
http://www.lt1.org/turbo/miss2.gif
The above are two different screen shots of the log I took... Right where the verticle line is located is where all hell breaks loose. Roughtly 14psi boost steady from 3700rpm (left of the graphs) through to there on both. Then spark quits. No fire means no more pressure in the exhaust, and in turn, boost drops off dramatically.
The top pink line is the throttle position. You can see I let off long after I lost spark.
I'm stumped and not having a very fuzzy feeling about the other two Delteq boxes, but I'll give them both a try...
http://www.lt1.org/turbo/miss1.gif
http://www.lt1.org/turbo/miss2.gif
The above are two different screen shots of the log I took... Right where the verticle line is located is where all hell breaks loose. Roughtly 14psi boost steady from 3700rpm (left of the graphs) through to there on both. Then spark quits. No fire means no more pressure in the exhaust, and in turn, boost drops off dramatically.
The top pink line is the throttle position. You can see I let off long after I lost spark.
I'm stumped and not having a very fuzzy feeling about the other two Delteq boxes, but I'll give them both a try...
Last edited by Roadie; May 8, 2007 at 08:40 PM.
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Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Thread Starter
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Joined: May 2001
Posts: 233
From: Ewa Beach, Hi USA
How old is your OPTI Roadie? Have you gutted it, or is it still stock? I'm still a long way from getting mine put back together, so your our only hope right now. I see John gave up and is going back to the OPTI. I cant believe we can get a Delteq to work with a factory PCM, but for over 2K for a FAST setup no one is having any luck. Are you using your stock wiring harness, or FAST harness'? I've totally gutted my stock wiring and am going to run strictly FAST harness'. I'm frustrated for you. Good luck, Rob.
Registered User
Joined: Jan 2003
Posts: 799
From: Breese, IL
It's a brand new Accel opti. I know the opti is working right because the RPM signal is never getting lost by the FAST box. If it was lost, then I'd replace it.
I'm using the stock wiring harness with a White Racing PCB interface (plug and play module that goes between the FAST box and the stock wiring harness). Everything works flawlessly for cruising around or even running hard, short shifting at 4500...
I'm fairly certain it's not a wiring issue or an opti issue because we'd see erratic problems, not it dying at exactly 4800 rpm time and time again. I've reproduced it at least 60 times so far in trying to diagnose/fix it. I can't believe how much I'm thrashing this shortblock in such a short time. It's holding up good though.
I'm using the stock wiring harness with a White Racing PCB interface (plug and play module that goes between the FAST box and the stock wiring harness). Everything works flawlessly for cruising around or even running hard, short shifting at 4500...
I'm fairly certain it's not a wiring issue or an opti issue because we'd see erratic problems, not it dying at exactly 4800 rpm time and time again. I've reproduced it at least 60 times so far in trying to diagnose/fix it. I can't believe how much I'm thrashing this shortblock in such a short time. It's holding up good though.
Last edited by Roadie; May 8, 2007 at 10:13 PM.
Registered User
Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Registered User
Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
He did get a new harness from Delteq to work with the FAST setup... so if thats what you are talking aout then ya.
Registered User
Joined: Jan 2003
Posts: 799
From: Breese, IL
The opti puts this signal out somewhere in the 10-11v range. The Delteq box actually processes this signal and generated a 5v signal to send back to the ECU. In the case of a stock PCM, 5v is all that is needed and there's no problem. In the case of the FAST ECU, it wants a 10-12v signal and usually will crank but not start.
You will appear to have spark because the Delteq box puts out it's own spark regardless of being commanded to or not (this is used to find the correct sequence on start-up). If your problem is this low voltage signal, your FAST box will show 0 rpm while cranking. Verify that you have 0 rpm while cranking before you start cutting.
Assuming you're trying to use a stock harness, what you need to do to fix this is to disect the Delteq opti harness and clip the high and low res signal wires that are comig out of the Delteq box and splice them into the high and low res signal wires going into the delteq box. This gives the FAST ECU the opti signals directly and shares them with the Delteq box.
http://www.delteq.com/Rev5c_VC.pdf
Page 18 of the above doc is the wiring schematic. Clip the PUR/WHT and RED/BLK wires. Splice the PUR/WHT wire going back to the wiring harness into the PUR/BLK wire. Splice the RED/BLK wire going back into the wiring harness into the RED/WHT wire. Cap off the PUR/WHT and RED/BLK wires coming from the Delteq box and leave them disconnected. Now you should have an RPM signal while cranking.
I haven't run the last box yet, but I plan to this afternoon... This last one has no label or anything on it... It's not glued/sealed yet and is just zip-tied holding it together. I'm hoping it's a development box that will make things all better. (I gotta be optimistic here!) You will appear to have spark because the Delteq box puts out it's own spark regardless of being commanded to or not (this is used to find the correct sequence on start-up). If your problem is this low voltage signal, your FAST box will show 0 rpm while cranking. Verify that you have 0 rpm while cranking before you start cutting.
Assuming you're trying to use a stock harness, what you need to do to fix this is to disect the Delteq opti harness and clip the high and low res signal wires that are comig out of the Delteq box and splice them into the high and low res signal wires going into the delteq box. This gives the FAST ECU the opti signals directly and shares them with the Delteq box.
http://www.delteq.com/Rev5c_VC.pdf
Page 18 of the above doc is the wiring schematic. Clip the PUR/WHT and RED/BLK wires. Splice the PUR/WHT wire going back to the wiring harness into the PUR/BLK wire. Splice the RED/BLK wire going back into the wiring harness into the RED/WHT wire. Cap off the PUR/WHT and RED/BLK wires coming from the Delteq box and leave them disconnected. Now you should have an RPM signal while cranking.
Last edited by Roadie; May 18, 2007 at 09:43 AM.