EForce with Stock Manifolds 1/4 Numbers
10-09-2012, 08:03 PM
#3
Racer
09 A6 LS3 2.73 with TVS2300 and around 7.5-8 lbs boost. 513 rwhp/484 rwtq
Everything else stock (manifolds, cam, trans, convertor, etc.) except for CAI.
Stock Goodyear GS-2 tires at 30psi cold.
55.0 F 389 DA
R/T 0.677
60' 1.814
330 4.860
1/8 7.361
MPH 98.35
1000 9.501
1/4 11.308
MPH 124.45
Adding AR 1-7/8 headers with cats did nothing, gained 0 hp and a few lb-ft of tq.
Everything else stock (manifolds, cam, trans, convertor, etc.) except for CAI.
Stock Goodyear GS-2 tires at 30psi cold.
55.0 F 389 DA
R/T 0.677
60' 1.814
330 4.860
1/8 7.361
MPH 98.35
1000 9.501
1/4 11.308
MPH 124.45
Adding AR 1-7/8 headers with cats did nothing, gained 0 hp and a few lb-ft of tq.
Last edited by deecount; 10-09-2012 at 08:08 PM.
10-09-2012, 08:17 PM
#4
Le Mans Master
2006 A6. Bone stock other than the E-Force.
Ran low 12s at 118-122.
The E-Force is a nice street blower, but is definitely NOT what you want for drag racing.
Ran low 12s at 118-122.
The E-Force is a nice street blower, but is definitely NOT what you want for drag racing.
10-09-2012, 10:31 PM
#5
Le Mans Master
I ran mid 11's when I had just the eforce. Now running mid 10's with a few other mods. They are fine for drag racing and a blast on the street.
10-10-2012, 10:11 PM
#8
Le Mans Master
10-10-2012, 10:40 PM
#9
Pro
Thread Starter
Thanks guys. I'm just trying to get a feel for the impact of headers on ETs and mph. I was fixated on RWHP numbers, but at the end of the day, ETs mean more. My expectations were what dee count experienced, for the case with everything else stock. I would expect better gains on ETs with headers once the cam and/or heads were swapped too though, giving better HP numbers (at higher rpm).
10-10-2012, 10:49 PM
#10
Le Mans Master
Thanks guys. I'm just trying to get a feel for the impact of headers on ETs and mph. I was fixated on RWHP numbers, but at the end of the day, ETs mean more. My expectations were what dee count experienced, for the case with everything else stock. I would expect better gains on ETs with headers once the cam and/or heads were swapped too though, giving better HP numbers (at higher rpm).
10-10-2012, 10:49 PM
#11
Le Mans Master
Headers are always a good idea on a blower car. I blew mine out pretty quick with my blower. LT headers with high flow cats seem to do better, but as the power goes up, you risk blowing them out too.
You won't see a big ET gain on stock cars with blowers vs stock cars with headers. Maybe .1-.2 to answer your question, because you can lose boost.They will really benefit you when you start turning up the wick.
You won't see a big ET gain on stock cars with blowers vs stock cars with headers. Maybe .1-.2 to answer your question, because you can lose boost.They will really benefit you when you start turning up the wick.
10-10-2012, 11:36 PM
#12
Drifting
09 A6 LS3 2.73 with TVS2300 and around 7.5-8 lbs boost. 513 rwhp/484 rwtq
Everything else stock (manifolds, cam, trans, convertor, etc.) except for CAI.
Stock Goodyear GS-2 tires at 30psi cold.
55.0 F 389 DA
R/T 0.677
60' 1.814
330 4.860
1/8 7.361
MPH 98.35
1000 9.501
1/4 11.308
MPH 124.45
Adding AR 1-7/8 headers with cats did nothing, gained 0 hp and a few lb-ft of tq.
Everything else stock (manifolds, cam, trans, convertor, etc.) except for CAI.
Stock Goodyear GS-2 tires at 30psi cold.
55.0 F 389 DA
R/T 0.677
60' 1.814
330 4.860
1/8 7.361
MPH 98.35
1000 9.501
1/4 11.308
MPH 124.45
Adding AR 1-7/8 headers with cats did nothing, gained 0 hp and a few lb-ft of tq.
Headers are always a good idea on a blower car. I blew mine out pretty quick with my blower. LT headers with high flow cats seem to do better, but as the power goes up, you risk blowing them out too.
You won't see a big ET gain on stock cars with blowers vs stock cars with headers. Maybe .1-.2 to answer your question, because you can lose boost.They will really benefit you when you start turning up the wick.
You won't see a big ET gain on stock cars with blowers vs stock cars with headers. Maybe .1-.2 to answer your question, because you can lose boost.They will really benefit you when you start turning up the wick.
10-11-2012, 01:08 AM
#13
Le Mans Master
Member Since: Jan 2003
Location: Portland Oregon
Posts: 8,596
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Captain Bob went 11.50s with nothing but a bolting on a E Force into his 2010 GS. Later I installed a set of American Racing 1 7/8 headers and he picked up 3 tenths.
10-11-2012, 08:54 AM
#14
Le Mans Master
Damn that's a pretty good time espically with the stock tires. I want to go to the track but I don't really want to pay $25 just to get thrown out for running under 11.5. Still would be nice to see if I'm faster than my old man in it.
You don't actually lose boost. The exhaust flows better so the boost gauge shows less restriction but you still are feeding the same amount of air into the engine. A common thing people do is pulley down to get back the boost that they thought they lost but the airflow is still there. The less your boost reading is the less stress is on the engine so it does help by adding the headers. Headers alone aren't a huge jump but they're worth it with supporting mods.
You don't actually lose boost. The exhaust flows better so the boost gauge shows less restriction but you still are feeding the same amount of air into the engine. A common thing people do is pulley down to get back the boost that they thought they lost but the airflow is still there. The less your boost reading is the less stress is on the engine so it does help by adding the headers. Headers alone aren't a huge jump but they're worth it with supporting mods.
I am not expert but I would assume that the airflow going in stays the same, but exits faster, which in turn means you are losing pressure in the cylinder . I am only going by what my boost guage tells me.
10-11-2012, 11:54 AM
#16
Le Mans Master
10-11-2012, 02:23 PM
#17
Drifting
The cylinder pressure would be the same since the same amount of air is going in. It flows better on the exhaust cycle but once the exhaust valve closes the same amount of air is pumped in. The only difference is when the valves overlap and you push the exhaust gas out faster via a less restrictive system.
Also good info. Generally lowering the boost by freeing up the intake and exhaust with cams, heads and headers will provide a great increase in power and less stress on the engine and supercharger. You can pulley down and gain back the boost but you will be putting the same stress on the engine as before. If you left it all as is the power would increase and the boost reading would be lower.
10-12-2012, 10:48 PM
#18
Racer
Thanks guys. I'm just trying to get a feel for the impact of headers on ETs and mph. I was fixated on RWHP numbers, but at the end of the day, ETs mean more. My expectations were what dee count experienced, for the case with everything else stock. I would expect better gains on ETs with headers once the cam and/or heads were swapped too though, giving better HP numbers (at higher rpm).
Dynos results are from 3 different shops, all Dynojets. E.T.'s are from the same track, obviously on different days and conditions.
Stock + supercharger + CAI
513rwhp/484rwtq ~7.5-8 lbs boost 11.30@124
+ AR 1 7/8 headers with cats
509rwhp/494rwtq 7.7 lbs boost 11.32@125
+ Cam (1 degree overlap) + pulley change + Mickey Thompsons
597rwhp/571rwhp 9.87 lbs boost 10.73@133
- headers (swapped to LS9 manifolds and cats)
555rwhp/539rwtq 9.69 lbs boost No E.T.
For me the headers were worthless without the cam and pulley swap. On the same note, the cam and pulley weren't worth the trouble ($$$) without the headers.
Last edited by deecount; 10-12-2012 at 10:51 PM.
10-13-2012, 10:42 PM
#19
Pro
Thread Starter
Here's my evolution of mods/power/E.T.
Dynos results are from 3 different shops, all Dynojets. E.T.'s are from the same track, obviously on different days and conditions.
Stock + supercharger + CAI
513rwhp/484rwtq ~7.5-8 lbs boost 11.30@124
+ AR 1 7/8 headers with cats
509rwhp/494rwtq 7.7 lbs boost 11.32@125
+ Cam (1 degree overlap) + pulley change + Mickey Thompsons
597rwhp/571rwhp 9.87 lbs boost 10.73@133
- headers (swapped to LS9 manifolds and cats)
555rwhp/539rwtq 9.69 lbs boost No E.T.
For me the headers were worthless without the cam and pulley swap. On the same note, the cam and pulley weren't worth the trouble ($$$) without the headers.
Dynos results are from 3 different shops, all Dynojets. E.T.'s are from the same track, obviously on different days and conditions.
Stock + supercharger + CAI
513rwhp/484rwtq ~7.5-8 lbs boost 11.30@124
+ AR 1 7/8 headers with cats
509rwhp/494rwtq 7.7 lbs boost 11.32@125
+ Cam (1 degree overlap) + pulley change + Mickey Thompsons
597rwhp/571rwhp 9.87 lbs boost 10.73@133
- headers (swapped to LS9 manifolds and cats)
555rwhp/539rwtq 9.69 lbs boost No E.T.
For me the headers were worthless without the cam and pulley swap. On the same note, the cam and pulley weren't worth the trouble ($$$) without the headers.