Some dyno numbers on a 2.8

[Guest]

These dynos are from a few weeks ago.

info:

Stock 2.8 liter iron head motor
dual tb intake
shorty headers
UD pulley
nitrous kit
4 degrees retard on timing
93 octane

Dyno run was done in 3rd gear

My a/f chart is a bit rich so I can lean it out a bit more. The goal is to hit 200 hp on the bottle. A little bit more nitrous should get me there. I have more then enough room to play with on the fuel and the plugs are looking perfect. THe torque doesnt' really start to drop till about 5k rpm. Thats pretty amazing if you ask me. I am pretty sure this is the better intake I have on it helping out in that dept.

Engine has 79k odd miles on it so its a bit tired.

No times yet on the qtr. With this power curve though and the weight of the car(no optioned Fiero 5 spd) I am guessing its a high 13 second car with a good launch and a mph of around 95-98 mph or so.

This thing absolutely pulls hard up top. It only drops 5 hp from 5200 rpm where it peaks to around 175 or so at 6k rpm! So its got a nice curve to it.

I raced a b16b swap civic the other day. At least he said it was a B18b swap. Thats the 185 hp ITR engine. Well lets just say I put about 8 cars on the guy starting from a roll and all in just 3rd gear.

Ok even though the pic is at 640x480 it still wont' let me add the attachment so I will just provide a link to it.

[geoffinbc]

LOL that is a funky fuel curve.

What this dual TB intake about. Got pics?

[ko0t3rskkar]

Stock 2.8 liter iron head motor
dual tb intake
shorty headers
UD pulley
nitrous kit
4 degrees retard on timing
93 octane

Thought you said it was stock. Maybe stock innerds but certainly not a stock motor.
What kinda dual TB setup is on that? I wanna see some pics of that as well.

[Guest]

yea I meant stock internals. These bolt ons are really that much extra power on an otherwise tiny cam and old non ported crappy flowing iron heads. The intake pretty much just helps keep the power from dropping in the upper rpms as opposed to falling on its face like a stock intake will do. AS you can see it only loses about 5 hp from 5200 rpm to 6k rpm. Most other iron head 2.8's with a fiero type intake will fall hard after about 5k rpm or so. Mine stays pretty flat. So as it doesnt' really add a ton more power it extends the power curve of the motor effectively making it faster.

The a/f curve is explainable.

I am running 19# injectors. When the car goes WOT the fuel starts dumping but the nitrous has yet to get to the intake manifold. Instead of the feed line from the solenoids being 2 feet I have about 3 feet. So I have a tiny extra delay. Also with the dual tb intake the intake velocity at lower rpm isn't as good as compared to a stock intake. So it takes some time for the nitrous to fill up the large plenum and then make its way down into the cylinder. So while all this is happening the curve drops down to about 10:1 and then as the nitrous is able to make its way into the cylinder the graph starts to level out. I am not too concerned with the first initial hit of the nitrous. It is a bit rich but its better then being lean. As long as the a/f curve stays below 12.3:1 on the bottle and is nice and flat like it is then thats all I care about.

[Guest]

intake looks a bit like this. I swapped a few things around on it and cleaned up some vacuum lines but this gives the general idea.

Shaun

[sharkey]

thats ausome. i was wondering how you dea lwith the dual idle air control valves. do you just splice them together, or does that confuse the ecm???

[Guest]

iac tube comes off of one tb. routes just like factory down into the lower plenum.

[TheProfessor]

how did you make that intake and what did you use

[Guest]

used 3 inch aluminum tubing. Wleded it onto the middle intake manifold.

[TheProfessor]

sweet

[dykz34]

Your pic isn't working for me... I wanted to see what the 2.8 was capable of!!!

[TheProfessor]

what is your power band like

[GPXSS]

nice dyno chart, HP increases directly proportional to Torque drop. oh wait, its just a red X.

[TheProfessor]

um what dyno chart???????????????

[Guest]

pic