What is the redline for a carb'ed '85 2.8, and a MPFI '87 2.8?

 

i dont know, i would like to help... my 92 3.1 has a redline at 6k
i think the 2.8's had a redline of 5.5k
some 2.8's had a 5k redline

 

hey,
i believe billsfirebird has a 2.8 thats carbed... u should e-mail him

 

Bill has the 2.4 L IRON DUKE inline 4 cyclinder

 

ohh well in that case dont ask bill,

 

REDLINE OR PEAK POWER OF MAX HP?
redline is until it blows up
In the case of the 2.8, honest I've gone to about 5,300
Peak HP is about 4,000
Engine runs outta breath at lower than 4500
ONLY REASON TO SHIFT AT HIGHER RPM
is to get next upshift in the correct RPM range powerband, quicker.
I have the carb & MPFI.
The 5,300 was on my truck.
Only way to make truck upshift (1-3, had no 2nd) with the bad tranny.
Needless to say, that plan didn't work long....
I'm doing the Boogie again!

 

not to sure about the carbbed version, but my 85 MPFI reds at 6k. The max power on the motor was 5100 rpm, and hte 6k shift from the automatic tranny puts me at about 4k to keep me close to powerband.

 

my 89 2.8 mpfi has yellow/orange line at 5.5k, redline at 6k. when i race i usually go up to 5500 before i shift to get into a better part of the powerband at the next gear.

 

Thanks all! I thought the MPFI was at 6K, but it's been a few years and I couldn't remember The '87 Camaro I just picked up for my engine swap has the "pain jane" interior, no tach My carb'ed 2.8 does see over 4K anyway, I was just curious. BTW, that 4K is at 75MPH, no OD!

 

Find an empty road
UpShift listen to the engine
Different levels of pressure on gas pedal.
Learn to understand your engine by ear.
You will hear when the peaky cam kicks in (2800-3000 rpm)
You will hear when engine enters lower torque band (2500)
Doing a brake/torque convertor stall, ends at 2000 2200.
IF you keep steady pressure on engine, you can also hear when engine is pushing to much air for any more good (hold tranny in first gear, medium steady foot pressure) 4000+
Most max upshifts occur (if everything adjusted decent) 4800+
Don't look at speedo, listen.
If ya hold in first & keep it there, it'll upshift at 5,000+

 

Ked, that sounds right for a MPFI 2.8. But, for the carb'ed version, they tend to run out about 4K. The TBI 2.8's arn't much better. My old Multi-Port 'Bird would start to sputter at 4500, but that had almost 200K miles on it

 

I've had my Blazer since 1989 & 77K miles. Engine died at 211,500
I added tach & my power upgrades right away (1989).
I knew what was happening (I corresponded RPM with highest vacuum readings, also, which tell the whole story).
Your answer is 100%.
BUT, my tranny was built so wrong/bad.
PLUS tranny gear ratios to engine power bands, etc.
My only way to get a good next up in powerband shift was to go the extra 500-1,000 RPM (for getting that space on the open road).
I compensated for lousy higher rpms, by doing better exhaust, better air inlet & better distributor upgrade & higher spark.
Those simple upgrades on my 2.8 Federal version carb Blazer/Auto (I have NO computers at all, just engine) really made all the diff in engine longevity, also.