Exhaust/pulley upgrade to Edelbrock blown GS
05-05-2015, 07:50 PM
#1
Safety Car
Thread Starter
Exhaust/pulley upgrade to Edelbrock blown GS
Well it didn't take me long, but in an effort to make the package more efficient, I'm having some LT headers/hi-flow cats installed along with a smaller blower pulley (to effectively gain back the boost that will be lost once the exhaust is freed up), and a Z06 in-tank fuel pump installed to make sure fuel delivery is no issue.
Car in question is a '12 GS A6 trans car with the LPE 670hp Edelbrock Supercharger package. LPE heads, GT9 cam.
It made 588rwhp STD on one dyno, but after I took it to my trusted tuner (21st Century Musclecars...forum vendor), it was found to be a bit lean, and it made 568rwhp SAE all buttoned up and safe on 93 octane.
I'd like to think I'd pick up another 30rwhp/30rwtq out of this ... we'll see. Ordering the parts now, should be done by the end of next week, and i'll report back.
Car in question is a '12 GS A6 trans car with the LPE 670hp Edelbrock Supercharger package. LPE heads, GT9 cam.
It made 588rwhp STD on one dyno, but after I took it to my trusted tuner (21st Century Musclecars...forum vendor), it was found to be a bit lean, and it made 568rwhp SAE all buttoned up and safe on 93 octane.
I'd like to think I'd pick up another 30rwhp/30rwtq out of this ... we'll see. Ordering the parts now, should be done by the end of next week, and i'll report back.
05-19-2015, 02:26 PM
#2
Safety Car
Thread Starter
Decided just to do headers + catted X-pipe
Due to the fact it was determined I'd need larger injectors (and that I already have the 3.25" pulley... I thought it was a 3.5"), it was decided to just do headers and hi-flow cat X-pipe.
I'm not trying to set records with this car, but am happy with trouble-free performance in lieu of ragged edge. Later on, I can upgrade the injectors and go to a 3.0" pulley... that might give me another 25rwhp.
Went from a safe 568rwhp/506rwtq to an equally safe (if not moreso b/c boost has dropped with the header install) 598rwhp/531rwtq, so the gains with headers over stock manifolds is across the entire rpm range... nice.
Had the trusted tuner (Matt) at 21st Century Musclecars (forum vendor) make sure all was in good shape as far as the tune goes and he did his magic on the A6 tranny tune as well, so the car runs fantastic.
In 2nd gear from a 40mph punch, it hooks up surprisingly well (it is 80^F here today, so that helps) with the Eagle F1s. They are very new (were on the car when I bought it), and I may sell them in go with the RE-11s, even though that's a non-RF tire.
I'm not trying to set records with this car, but am happy with trouble-free performance in lieu of ragged edge. Later on, I can upgrade the injectors and go to a 3.0" pulley... that might give me another 25rwhp.
Went from a safe 568rwhp/506rwtq to an equally safe (if not moreso b/c boost has dropped with the header install) 598rwhp/531rwtq, so the gains with headers over stock manifolds is across the entire rpm range... nice.
Had the trusted tuner (Matt) at 21st Century Musclecars (forum vendor) make sure all was in good shape as far as the tune goes and he did his magic on the A6 tranny tune as well, so the car runs fantastic.
In 2nd gear from a 40mph punch, it hooks up surprisingly well (it is 80^F here today, so that helps) with the Eagle F1s. They are very new (were on the car when I bought it), and I may sell them in go with the RE-11s, even though that's a non-RF tire.
05-19-2015, 03:03 PM
#4
Race Director
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St. Jude Donor '15
Due to the fact it was determined I'd need larger injectors (and that I already have the 3.25" pulley... I thought it was a 3.5"), it was decided to just do headers and hi-flow cat X-pipe.
I'm not trying to set records with this car, but am happy with trouble-free performance in lieu of ragged edge. Later on, I can upgrade the injectors and go to a 3.0" pulley... that might give me another 25rwhp.
Went from a safe 568rwhp/506rwtq to an equally safe (if not moreso b/c boost has dropped with the header install) 598rwhp/531rwtq, so the gains with headers over stock manifolds is across the entire rpm range... nice.
Had the trusted tuner (Matt) at 21st Century Musclecars (forum vendor) make sure all was in good shape as far as the tune goes and he did his magic on the A6 tranny tune as well, so the car runs fantastic.
In 2nd gear from a 40mph punch, it hooks up surprisingly well (it is 80^F here today, so that helps) with the Eagle F1s. They are very new (were on the car when I bought it), and I may sell them in go with the RE-11s, even though that's a non-RF tire.
I'm not trying to set records with this car, but am happy with trouble-free performance in lieu of ragged edge. Later on, I can upgrade the injectors and go to a 3.0" pulley... that might give me another 25rwhp.
Went from a safe 568rwhp/506rwtq to an equally safe (if not moreso b/c boost has dropped with the header install) 598rwhp/531rwtq, so the gains with headers over stock manifolds is across the entire rpm range... nice.
Had the trusted tuner (Matt) at 21st Century Musclecars (forum vendor) make sure all was in good shape as far as the tune goes and he did his magic on the A6 tranny tune as well, so the car runs fantastic.
In 2nd gear from a 40mph punch, it hooks up surprisingly well (it is 80^F here today, so that helps) with the Eagle F1s. They are very new (were on the car when I bought it), and I may sell them in go with the RE-11s, even though that's a non-RF tire.
Regardless, 600rwhp is a fun ride
05-19-2015, 03:26 PM
#5
Safety Car
I've been told that the Z06 fuel pump will handle up to about 600 rwhp, but what are your thoughts?
I'm planning on doing a similar setup to this on my GS MN6 eventually, and I will monitor fuel pressure, but was only planning on using my existing Z06 fuel pump.
Should I rethink this?
I'm planning on doing a similar setup to this on my GS MN6 eventually, and I will monitor fuel pressure, but was only planning on using my existing Z06 fuel pump.
Should I rethink this?
05-19-2015, 04:03 PM
#6
Safety Car
Thread Starter
05-19-2015, 04:05 PM
#7
Safety Car
Thread Starter
05-19-2015, 06:48 PM
#8
Le Mans Master
I've been told that the Z06 fuel pump will handle up to about 600 rwhp, but what are your thoughts?
I'm planning on doing a similar setup to this on my GS MN6 eventually, and I will monitor fuel pressure, but was only planning on using my existing Z06 fuel pump.
Should I rethink this?
I'm planning on doing a similar setup to this on my GS MN6 eventually, and I will monitor fuel pressure, but was only planning on using my existing Z06 fuel pump.
Should I rethink this?
05-19-2015, 06:57 PM
#9
Le Mans Master
DCR can change with a camshaft swap or anything you do to change the static compression ratio. You won't change it with boost changes. Nothing you do on the front side (intake) or the back side (exhaust) will change it either. The static compression ratio along with where the cam shuts the intake valve along the compression stroke determines an engine's DCR. Shut the intake valve sooner with narrower LSA and/or cam ground in advance increases the DCR. Wider LSA's and/or less cam advance decreases it (assuming the SCR remains the same).