I posted this in tech, but want to try here.
This weekend I installed 42.5 lb injectors and a TA-49 turbo on my friends stock Buick. Install went good without a problem. We replaced stock stuff with,.....new turbo, wastegate(not HD accuator), GM boost line with "y" fitting, intercooler hoses. I set the wastegate rod to the longest setting and went for a test drive and the boost would go to a easy 18 psi (let off due to pump gas).
I have since swapped everything that has to do with boost control with new parts from my Buick. Here is what we did....
1. lengthend wastegate rod all the way out during all tests
2. changed new wastegate back to original stock....since changed back to new, thinking maybe old one was leaking...no luck
3. Checked new "y" fitting for correct size hole.....ok, put old boost line back on with "y" fitting, put known good "y" fitting from my car on no luck.
4. replaced wastegate solinoid with new delco....no luck
5 by-passed solinoid and "y" with vac line going from comp housing to wastegate.....no luck 10psi in 1st gear 18 in 2nd......
6. If we undo the wastegate from the puck the car will not make boost just like it should. If I slip the rod back set to the length that the flapper is barley open it still makes no less that 16 psi
7. Puck on downpipe is not stuck moves freely
After all this the only thing i can think of is the hole in the exhaust housing needs to be enlarged for the exhaust to bled out easier alowing less boost. But its just a stock motor with a little 49
But why cant we get boost down to say 10psi. We dont want a bleeder/grainger valve or a bandaid fix.
------------Current set-up on overboosting car
Stock original 15k motor
K&N with hard Maf pipe
stock intercooler
new adjustable wastegate
adjustable FPR
walbro 340 hotwired
009 inj
93 octane JL chip
THDP
precision 3000 stall
new TA-49
This weekend I installed 42.5 lb injectors and a TA-49 turbo on my friends stock Buick. Install went good without a problem. We replaced stock stuff with,.....new turbo, wastegate(not HD accuator), GM boost line with "y" fitting, intercooler hoses. I set the wastegate rod to the longest setting and went for a test drive and the boost would go to a easy 18 psi (let off due to pump gas).
I have since swapped everything that has to do with boost control with new parts from my Buick. Here is what we did....
1. lengthend wastegate rod all the way out during all tests
2. changed new wastegate back to original stock....since changed back to new, thinking maybe old one was leaking...no luck
3. Checked new "y" fitting for correct size hole.....ok, put old boost line back on with "y" fitting, put known good "y" fitting from my car on no luck.
4. replaced wastegate solinoid with new delco....no luck
5 by-passed solinoid and "y" with vac line going from comp housing to wastegate.....no luck 10psi in 1st gear 18 in 2nd......
6. If we undo the wastegate from the puck the car will not make boost just like it should. If I slip the rod back set to the length that the flapper is barley open it still makes no less that 16 psi
7. Puck on downpipe is not stuck moves freely
After all this the only thing i can think of is the hole in the exhaust housing needs to be enlarged for the exhaust to bled out easier alowing less boost. But its just a stock motor with a little 49
But why cant we get boost down to say 10psi. We dont want a bleeder/grainger valve or a bandaid fix.
------------Current set-up on overboosting car
Stock original 15k motor
K&N with hard Maf pipe
stock intercooler
new adjustable wastegate
adjustable FPR
walbro 340 hotwired
009 inj
93 octane JL chip
THDP
precision 3000 stall
new TA-49