dyno'd the 2.7i

[digger]

correct, I do not post numbers on my car. mainly because numbers are bullshit, I can make the numbers what ever I want if I am controlling the dyno which I am.

the important thing to look at is the amount of time you have HP and TQ. if you only have it for 1000 RPM you have a car that useless! My car has TQ that is usefull for 2500 RPM and HP that is usefull for about 2000 RPM coming in about 600 RPM after the TQ, all while maintaining AFR that is 11.9-12.4 from 2000 RPM to REDline. that is a very useable power curve that took hours and hours of dyno tuning and that is more impressive to me than a car that makes 50 more peak hp but has no useability and an AFR that is going to blow a gasket at anytime

Its fine to have a nice band where the torque curve is flat and to have hp that doesn't suddenly hit the wall at high rpm but ultimately magnitudes are important. If you run a stock car on same machine then you can get a reasonable enough baseline.

If you post a graph there will be those who don't know what they are looking at or talking about but those that matter will know.

Ultimately this a forum where people come to learn and discuss so showing real results and what can and can't be achieved is very useful to many as it builds the knowledge base.

[Sagaris]

.... and an AFR that is going to blow a gasket at anytime

[briansjacobs]

where? there is a plot but no numbers

correct, I do not post numbers on my car. mainly because numbers are bullshit, I can make the numbers what ever I want if I am controlling the dyno which I am.

the important thing to look at is the amount of time you have HP and TQ. if you only have it for 1000 RPM you have a car that useless! My car has TQ that is usefull for 2500 RPM and HP that is usefull for about 2000 RPM coming in about 600 RPM after the TQ, all while maintaining AFR that is 11.9-12.4 from 2000 RPM to REDline. that is a very useable power curve that took hours and hours of dyno tuning and that is more impressive to me than a car that makes 50 more peak hp but has no useability and an AFR that is going to blow a gasket at anytime

[digger]

He has. ;)

where? there is a plot but no numbers

[briansjacobs]

He has. ;)

actually the sheet I posted was from my car. I will see if I can get my hands on the dyno sheet from the 2.5L car.

I will be retuning my 2.8 to run on pump gas soon, will post whenever I get around to running it.

[ForcedFirebird]

i would be intersted in seeing the plot from this dyno if you can post it up.

He has. ;)

[digger]

you can make 205RWHP in a 2.8 without ITB's

You need 12.5 compression and larger valves and a nasty cam running on 100oct. We are seeing 190 RWHP out of a 2.5L with the same set up. I would imagine the car is undrivable on the street but it is a great race car.

i would be intersted in seeing the plot from this dyno if you can post it up.

[accident]

oh how i would love to go for a ride in an 8 second car.

[ForcedFirebird]

Park the car on top of the rollers, strap from the front around the rims on the grate, rear to some bolts in the floor is how they have done the last few cars I had in there. They have grown from 2 bays to 7 or 8 in the last year. They do a lot of Subi's, but mostly EVO's. They have a few 8 second cars.

[accident]

just weird to me i guess lol. how did they keep it in place?

[ForcedFirebird]

Dunno. Seen both.

In fact, just type "dyno" in google image search and there's tons of pics of single rollers.

[accident]

no no, i understand that it's an AWD dyno, but from the looks of it the wheels sit on top of one roller? all of the dynos i've seen are like this o_o where o is a roller and _ is a hydraulically controlled lifter that pushes the wheels out of the gap or allows them to fall in

[ForcedFirebird]

dyno in the OP is weird. every dyno i've seen has two rollers that cradle the wheels

It's an eddy current AWD dyno. The two FWD rollers were moved back. Taken at AWD Motorsports Coral Springs, FL.

[accident]

dyno in the OP is weird. every dyno i've seen has two rollers that cradle the wheels

[brody]

you guys missed the point of my post, i said that power at that rpm! Because a 2.7/2.8L M20 won't make that torque (on a dyno that reads sensibly, I laugh at some of the dynojet numbers i see).

Lets look at it this way assume its a 2.8L: 215wtq = say 250tq (assuming typical losses people claim!!!) which is near enough to 90ftlb/L look at some of the best tuned engines and do the same calculation (Torque/L). 911GT3 RS = 83ftlb/L; E46 M3 CSL = 84ft/L.

Torque/L is very closely related to volumetric efficiency

What this means is to make 205whp from a 2.8L you'd be making peak power at 6500-7000rpm almost certainly and not 5000rpm (2.8L aint enough cc's). I have no doubt you could make more than this but you need more rpm and to be still making torque in those high rpm.

yup, my bad. Didn't keep reading.