Dyno Data

#1

Interesting, I was just looking at the online dyno data and comparing to my Porsche 944 ('89 2.7 motor). My 2.7 makes more Torque total and more early-on than these 6’s. Most the of sheets show a 125 ft/lb reading from 2500 to 3500 before rising to that peak bubble. My 2.7 makes around 130 at 2500 and rises steadily to a 153 peak.

I guess that the effect of a chip and header has quite a bit of difference since I am down 2 cyls and .5L of displacement. I was expecting more bottom end to show up on the dyno sheets. Any particular datasheet from an engine that has fresh rings/bearings? That’s all I did mechanically to my 153K 2.7.

Wondering what a dynosheet will look like if I put rings/bearings into engine of the car that I just bought?

Any thoughts here on engine prep? Specifically, I know that I need to do the timing belt. Dave E. suggested buying a gasket kit since the engines tend to seep oil (this one is no exception). Doing rod bearings from the bottom is probably a no-brainer but pulling the engine to put in fresh mains/rings is a lot more work. The car has 163k on the clock. I was thinking about putting a timing belt on it, sending the injectors out for cleaning and then taking it to the dyno for a baseline. Thoughts?

#2

How was your larger-displacement 2.7 L Porsche engine down .5 L on the 2.5 L sixes we’ve got? (That Porsche 4 must have had some big-ass pistons!)

Sasha

#3

Ex36 wrote:

[quote]How was your larger-displacement 2.7 L Porsche engine down .5 L on the 2.5 L sixes we’ve got? (That Porsche 4 must have had some big-ass pistons!)

Sasha[/quote]

Actually, that would be "tiny" to be down a .5 litre. Guess I should stop trying to think in the AM. Somehow, my mind was thinking - 325 - 3.2l DOH :huh:

So, in any case, I am up .2L but have fewer pistons. Everyone that I know talks about the 325 being a "torqey" motor. Guess I was expecting to see that it had more torque than my 4 cylinder. Maybe a stock comparison would be different as the spec e30 cars are much more "stock" than my car.

#4

erupert66 wrote:

[quote]Interesting, I was just looking at the online dyno data and comparing to my Porsche 944 ('89 2.7 motor). My 2.7 makes more Torque total and more early-on than these 6’s. Most the of sheets show a 125 ft/lb reading from 2500 to 3500 before rising to that peak bubble. My 2.7 makes around 130 at 2500 and rises steadily to a 153 peak.

I guess that the effect of a chip and header has quite a bit of difference since I am down 2 cyls and .5L of displacement. I was expecting more bottom end to show up on the dyno sheets. Any particular datasheet from an engine that has fresh rings/bearings? That’s all I did mechanically to my 153K 2.7.

Wondering what a dynosheet will look like if I put rings/bearings into engine of the car that I just bought?

Any thoughts here on engine prep? Specifically, I know that I need to do the timing belt. Dave E. suggested buying a gasket kit since the engines tend to seep oil (this one is no exception). Doing rod bearings from the bottom is probably a no-brainer but pulling the engine to put in fresh mains/rings is a lot more work. The car has 163k on the clock. I was thinking about putting a timing belt on it, sending the injectors out for cleaning and then taking it to the dyno for a baseline. Thoughts?[/quote]

IMPO I wouldn’t be looking for more horsepower just realiability. If your worried about being slower than your 944 just take a look at the average laptimes of the spec e30’s vs. the average laptimes of the spec 944’s. I also wouldn’t open up the bottom end on a 325 unless the bottom end has over 200k on it. Good luck.

my 2cents/

mike not ed

#5

edavidson wrote:

[quote]erupert66 wrote:

[quote]Interesting, I was just looking at the online dyno data and comparing to my Porsche 944 ('89 2.7 motor). My 2.7 makes more Torque total and more early-on than these 6’s. Most the of sheets show a 125 ft/lb reading from 2500 to 3500 before rising to that peak bubble. My 2.7 makes around 130 at 2500 and rises steadily to a 153 peak.

I guess that the effect of a chip and header has quite a bit of difference since I am down 2 cyls and .5L of displacement. I was expecting more bottom end to show up on the dyno sheets. Any particular datasheet from an engine that has fresh rings/bearings? That’s all I did mechanically to my 153K 2.7.

Wondering what a dynosheet will look like if I put rings/bearings into engine of the car that I just bought?

Any thoughts here on engine prep? Specifically, I know that I need to do the timing belt. Dave E. suggested buying a gasket kit since the engines tend to seep oil (this one is no exception). Doing rod bearings from the bottom is probably a no-brainer but pulling the engine to put in fresh mains/rings is a lot more work. The car has 163k on the clock. I was thinking about putting a timing belt on it, sending the injectors out for cleaning and then taking it to the dyno for a baseline. Thoughts?[/quote]

IMPO I wouldn’t be looking for more horsepower just realiability. If your worried about being slower than your 944 just take a look at the average laptimes of the spec e30’s vs. the average laptimes of the spec 944’s. I also wouldn’t open up the bottom end on a 325 unless the bottom end has over 200k on it. Good luck.

my 2cents/

mike not ed[/quote] Eric, I agree with Mike…keep it closed up unless you have a bad leakdown test result. Change the t-belt, tensioner and water pump, cam seal.Make sure you replace the supply and return fuel lines too.

#6

edavidson wrote:

[quote]
IMPO I wouldn’t be looking for more horsepower just realiability. If your worried about being slower than your 944 just take a look at the average laptimes of the spec e30’s vs. the average laptimes of the spec 944’s. I also wouldn’t open up the bottom end on a 325 unless the bottom end has over 200k on it. Good luck.

my 2cents/

mike not ed[/quote]

Well, I am thinking that I will definately be a bit slower as I have run faster than the current e30 times. However, in a '44 I carry almost 300 more lbs. but get to run the sticky Hoosiers. I am looking forward to running the Toyo’s, the slip angle always looks crazy on the e30’s.

OK, so I have 163K. Sounds like gasket the leaks, timing and waterpump (as planned), clean the injectors and she’s ready to go. I picked the car up on Thursday and took it for a drive last night. Quite a fun little street car. My oldest son is already begging me not to chop it into a racecar but keep it for a streetcar :ohmy: