excobraguy
Member
- Joined
- Feb 25, 2007
OK, so after taking my car to the track recently, I am VERY disappointed in the results. One run actually cut a 3.0 second 60' time, yes 3.0!!!!!! Totally a dog taking off...........
Here's what I have noticed and what I have tried. I'm looking for input on what to fix and what to leave alone, adjust, tweak etc.....
My setup:
a TA58 turbo, 60lb injectors, TH style downpipe (it is cracked at one of the weld seams), stock intercooler, stock maf, KN filter, M/T drag radials, stock headers (unknown if there are leaks), no cat runs out to dual exhaust. Accufab FPR set to 43 lbs, Alcohol chip from Turbo tweak (No Alky injection yet), AEM A/F gauge, Scanmaster 2.1, Manual transbrake, RJC boost controller with wastegate turned all the way in. Running 23 lbs of boost on 110 VP racing fuel
What I've noticed at idle:
At idle the car's A/F ratio will lean out and go above the 17.9:1 mark and go to -- -- on the gauge. Revving the engine will bring it into the 14.5:1 range but then goes back to the -- -- with no revving.
When I installed the new Alky chip BLM's stayed at 128 but then went to 142 like the old chip TT 5.7 did. Cruising the BLM's go down.
What I noticed when using the trans brake and launching:
Builds boost VERY VERY SLOWLY!
When it finally hits 10 lbs, after like a 10 second wait, the AEM A/F gauge is showing 10:1 AFR and would go lower I bet but 10:1 is the lowest reading it can go, car is running pig rich trying to boost!
When shifting from 1 to 2 off the transbrake it bogs and then finally boost will build and it grabs and moves out good.
Fuel pressure did build up with the boost at a 1:1 ratio.
What I tried and the results:
So after reading that running rich slows down boost I adjusted my FPR to run leaner. This did in fact help the boost spool but after spooling and then launching I would hit like 400-500 mv on the Scanmaster o2 readings and some 15:1's on the AEM, definitely not safe.
So my questions
OK, if you read all this you saw that I said I had a cracked downpipe, could this be the cause of the high BLM's I am seeing at idle?
Could a cracked header with the cracked downpipe be causing a pig rich condition when trying to boost? Again, 10:1 is where it is when launching and taking off on the transbrake.
How much of it could be the chip? Keep in mind my old chip did the exact same thing, 142 BLMS and slow spooling.
Why is it a lot of guys with similar problems have the same BLM of 142??? I've seen it a lot.
Anyone have any input on this?
I noticed my fuel pressure bleeds down to 0 in less than 4 hrs, is this normal? Should it hold the pressure at the line?
Things I am going to check and try based on what I've read:
The puck sealing in the wastegate, no visible leaks in this area.
header cracks, smoke test???? or take them off for inspection?
Any input is greatly appreciated, thanks in advance!!!!!!
Here's what I have noticed and what I have tried. I'm looking for input on what to fix and what to leave alone, adjust, tweak etc.....
My setup:
a TA58 turbo, 60lb injectors, TH style downpipe (it is cracked at one of the weld seams), stock intercooler, stock maf, KN filter, M/T drag radials, stock headers (unknown if there are leaks), no cat runs out to dual exhaust. Accufab FPR set to 43 lbs, Alcohol chip from Turbo tweak (No Alky injection yet), AEM A/F gauge, Scanmaster 2.1, Manual transbrake, RJC boost controller with wastegate turned all the way in. Running 23 lbs of boost on 110 VP racing fuel
What I've noticed at idle:
At idle the car's A/F ratio will lean out and go above the 17.9:1 mark and go to -- -- on the gauge. Revving the engine will bring it into the 14.5:1 range but then goes back to the -- -- with no revving.
When I installed the new Alky chip BLM's stayed at 128 but then went to 142 like the old chip TT 5.7 did. Cruising the BLM's go down.
What I noticed when using the trans brake and launching:
Builds boost VERY VERY SLOWLY!
When it finally hits 10 lbs, after like a 10 second wait, the AEM A/F gauge is showing 10:1 AFR and would go lower I bet but 10:1 is the lowest reading it can go, car is running pig rich trying to boost!
When shifting from 1 to 2 off the transbrake it bogs and then finally boost will build and it grabs and moves out good.
Fuel pressure did build up with the boost at a 1:1 ratio.
What I tried and the results:
So after reading that running rich slows down boost I adjusted my FPR to run leaner. This did in fact help the boost spool but after spooling and then launching I would hit like 400-500 mv on the Scanmaster o2 readings and some 15:1's on the AEM, definitely not safe.
So my questions
OK, if you read all this you saw that I said I had a cracked downpipe, could this be the cause of the high BLM's I am seeing at idle?
Could a cracked header with the cracked downpipe be causing a pig rich condition when trying to boost? Again, 10:1 is where it is when launching and taking off on the transbrake.
How much of it could be the chip? Keep in mind my old chip did the exact same thing, 142 BLMS and slow spooling.
Why is it a lot of guys with similar problems have the same BLM of 142??? I've seen it a lot.
Anyone have any input on this?
I noticed my fuel pressure bleeds down to 0 in less than 4 hrs, is this normal? Should it hold the pressure at the line?
Things I am going to check and try based on what I've read:
The puck sealing in the wastegate, no visible leaks in this area.
header cracks, smoke test???? or take them off for inspection?
Any input is greatly appreciated, thanks in advance!!!!!!