7a cam timing

[th.b.w.]

Hey,

i have testing an 3b vs 7a EM Cam on anS2 3b with 3071, Wagner short IM, EVO EM, XXL Ic, etc....

red ist stock 3b, black 7a cam

You can see in high range the 7a cam is better but no realy low torque less.....


Thomas

[Nik0las]

does engine lose it normal work in low RPM with both 7A cams ?

[th.b.w.]

...dont know, its only the ex cam install....

Thomas

[K7ERG]

with the gt3071r 0.63 it is better to stay with stock cams. Or use the exhaust 7a cam? With a street setup 450bhp. . . . . . .

[Bram]

Hey,

i have testing an 3b vs 7a EM Cam on anS2 3b with 3071, Wagner short IM, EVO EM, XXL Ic, etc....

red ist stock 3b, black 7a cam

You can see in high range the 7a cam is better but no realy low torque less.....


Thomas

Hi Thomas,

Interesting results you have. I presume you did the RR test in 3rd gear?

Did you change anything with the cam timings?

[S2central.net]

with the gt3071r 0.63 it is better to stay with stock cams. Or use the exhaust 7a cam? With a street setup 450bhp. . . . . . .

Based on what I've seen / felt with a similar sized 2871R then stock 3B/AAN/ABY cams are just fine for 400-450bhp. I'd say there is some gain to be had with higher lift EX cam like RS2 or 7A but I wouldn't bother with 7A inlet cam unless you wish to get into adjustable camshaft timing.

[S2central.net]

Actually with 7A EX cam - I'm just seeing the graph at post #46... That smells right to me - a little gain in power at the high revs is apparent there.

It would be interesting to see similar tests with 7A IN cam - I'd bet the mid range torque is significantly reduced unless adjustable cam timing was employed......

[th.b.w.]

Hey Bram,

yes 3rd gear, it's original timing, only change the cams.

You can look at Meckisforum, more infos with the cams and XXL Intercooler....

Have you an RR plot ...


Thomas

[Nik0las]

Ok why you don't test it with both 7A cams? I'm planning to do so on my AAN with 280hp to se the result. From logical point of view with both 7A cams your going to increase the hp and torque, due to the bigger lift, or not? And what about NM cams they're seems to be a compromise between ADU and 7A.

[Audi_CQ]

Ok why you don't test it with both 7A cams? I'm planning to do so on my AAN with 280hp to se the result. From logical point of view with both 7A cams your going to increase the hp and torque, due to the bigger lift, or not? And what about NM cams they're seems to be a compromise between ADU and 7A.

No use for the 7A inlet with std turbo. You will only loose some low down power and gain nothing at the top because the turbo is the limit, not the inlet cam.

[bogdanclung]

Hi,

I want install "7A cams" on a AAN engine stock, with "turbo 5857", "DTA ecu" and Fully ajustable cams gear.

Can anyone tell me what angles to use for cams?

[porkkis]

Start with 110-112 peak angles for both and then try out different settings if that's not good.

[bogdanclung]

Start with 110-112 peak angles for both and then try out different settings if that's not good.

Hi,

Can you tell me the opening time for 7A cams?

Thank you.

[ManiacuV6]

For 7A : Inlet opens 6BTDC Inlet closes 38ATDC Exhaust opens 42 BTDC Exhaust closes 3 BTDC.

[Ugemi]

This was a good threat to find.
I have ported head with 7a cams and both adjustable cam gears. gt3071r atm, but thinking of changing to gtx3076. I´ve started to test different values for the timing(about 2 degrees at the time) and gonna change it a little every night to test it on my way to work. The only problem is, that the test is just on the road with me looking at the gauges..