What are your MAP readings?

[TFZ_Z06]

Looking for MAP values at idle for both STOCK AND AFTERMARKET cams.
If your cam is not stock, please state the specs if known.

For example, my stock cam was around 45kpa, my aftermarket (in sig)
72kpa. Stock 03Z cam in a 12:1 416, 29kpa.

[mr.prick]

I don't know what my cam specs are in my 383 but MAP @ idle averages 45.6 kPa and
85 kPa max @ mile high altitude.

[WeathermanShawn]

Stock: ? ..To long ago..:grin:

Aftermarket Cam: 228/232 110+2 (10 degrees of overlap): ~ 48 kPa at 5400'..equates to ~ 66 kPa at sea-level.

Idle: 800 RPM's (M6)..24 degrees base timing..

[swingtan]

MAP readings will vary widely with the chosen idle spark settings. For example...

220/224 @ 114



Base Spark MAP kPa

22' 39
20' 45
16' 46
15' 47
13' 48
12' 50


Simon.

Compared to the stock cam

[gmperformancecentre]

here's mine

224/228 598 thou lift 112 lobe
14 deg base idle timing
60 kpa at 800 rpm idle (operate temp)

[joecar]

2001 stock LS1 (196/207 116):
36 kPa
564 rpm
Timing 26°
ECT 194°F
MAF 6g/s
thru stock exhaust manifold

I can look thru some logs to see what difference LT headers make... or I can put them back on soon (I also got LS6 heads/cam I can put on).

[WeathermanShawn]

ZO6:

Nice sound clip!!!


MAP readings will vary widely with the chosen idle spark settings. For example...

220/224 @ 114



Base Spark MAP kPa

22' 39
20' 45
16' 46
15' 47
13' 48
12' 50
Simon.

Compared to the stock cam

Swingtan thats an interesting association you show with Base Spark and MAp kPa. I probably did not realize it was that dependent on base spark. I ended up with the 20-24 base spark at Idle, but your chart does make a lot of sense.



I can look thru some logs to see what difference LT headers make... or I can put them back on soon (I also got LS6 heads/cam I can put on).

Joecar, it might be interesting to see how your car may do with some additional mods. There are times I wish I had the bucks to have one LS1 modded, and one completely stock. Sometimes I forget how nice these cars are just totally stock. Though I must say I would have a hard time without an aftermarket exhaust and headers.

I know being in California it probably is not easy. But even a 'milder' cam and a little head work can add to the driving experience. I ran a 'smog' cam 220/220 114 for awhile. I actually liked that cam. Mod fever is hard to break though!

OP, sorry to divert. Thats a nice 1/4 mile time you have. Is this your 'street-car', or just track?

[TFZ_Z06]

ZO6:
...
OP, sorry to divert. Thats a nice 1/4 mile time you have. Is this your 'street-car', or just track?

I recently yanked the license plates off of it, then later changed my mind when reality set in that I couldn't drive it this summer. I guess that defines it as a mostly strip, some street. :hihi:

I'm adding a 255/263 cam and turn downs soon. (to experience a June race that is coming up; it will get trailored for that). I'll post up a WMV when available.

Thanks for the data guys. I am just interested in how diff cams and LSAs affect vacuum.

[Happy Jim]

2000 LS1
Thunder Road TR230 Cam 230/224 111)
57 kPa
826 rpm
Timing 21°
ECT 85°C
MAF 9g/s
Tubular manifold, 2.5" Duals

Rgds

Jim

[The Alchemist]

excellant illistration! I often change the in gear spark by 3 to 4 degrees lower timing so you get a nice fat off beat when sitting at the lights :) yeah baby :rockon:


MAP readings will vary widely with the chosen idle spark settings. For example...

220/224 @ 114



Base Spark MAP kPa

22' 39
20' 45
16' 46
15' 47
13' 48
12' 50


Simon.

Compared to the stock cam