2.7 stroker on the dyno

[krooks]

What bottom end are you using? Super eta? Try and see if a chip and FPR will make a difference

[nando]

a FPR isn't going to help his fuel curve, it already goes rich at WOT and changing the base pressure is going to make that worse. A chip is unlikely to help either, it needs to be specific to his engine not generic.

needs a full tune, still putting down decent #s though. get it tuned! :)

[ForcedFirebird]

a FPR isn't going to help his fuel curve, it already goes rich at WOT and changing the base pressure is going to make that worse. A chip is unlikely to help either, it needs to be specific to his engine not generic.

needs a full tune, still putting down decent #s though. get it tuned! :)

Correct. If he swaps his injectors to 19# we will have a base tune for this car. A local here has the same cam and headers, but 19lb injectors on a b25. Should be close enough for Alex to fine tune it himself with his emulator.

[SkywayScraper]

I'm getting ready to do this in a couple weeks. I have all the parts already is there anything I should know before hand tips? Did your car have any trouble cranking up the first time after the swap was done?

[dirty thirty]

Nice job putting a similar setup together my self

[acolella76]

What bottom end are you using? Super eta? Try and see if a chip and FPR will make a difference

I'm using the flat top eta pistons

a FPR isn't going to help his fuel curve, it already goes rich at WOT and changing the base pressure is going to make that worse. A chip is unlikely to help either, it needs to be specific to his engine not generic.

needs a full tune, still putting down decent #s though. get it tuned! :)

Yeah, it still needs to be tuned :) Thank you!

Correct. If he swaps his injectors to 19# we will have a base tune for this car. A local here has the same cam and headers, but 19lb injectors on a b25. Should be close enough for Alex to fine tune it himself with his emulator.

Damn, and I just sold my 19# injectors!

I'm getting ready to do this in a couple weeks. I have all the parts already is there anything I should know before hand tips? Did your car have any trouble cranking up the first time after the swap was done?

It had trouble because I was dumb and switched two of the plugs around, but once they were plugged into the right connector it started up just fine. It's exactly like changing a head gasket, only you are replacing the electronics as well. It's all pretty straight forward. Good luck!

Nice job putting a similar setup together my self

Thanks, and good luck!

[justice101]

I dyno'd 151hp and 150 tq on a stock m20 2.5 with 200k miles on a DynoJet. My 2.7i SuperETA with 885 head, cam, etc etc put down 165hp and 160tq. I made power all the way to my 6500 redline. What flywheel are you running? Are those 17inch wheel? If so, are they heavy? I think thats also hurting your tq.

Thats rather disappointing. I was hoping a properly tuned seta/i m20 would do better than that :weak:

[robgoesvroom]

so, was it worth it? How much did it end up costing you all together? Would you have rather saved the money and bought a 3.1L stroker kit and fully build it?

Sorry for all the questions! :)

[acolella76]

so, was it worth it? How much did it end up costing you all together? Would you have rather saved the money and bought a 3.1L stroker kit and fully build it?

Sorry for all the questions! :)

Hell yes it was worth it! I believe I spent close to $1k, but keep in mind I also did A TON of maintenance and unnecessary stuff. I would've liked a 3.1L but it wasn't in the cards. What I would rather have done is what I'm about to start on this week. I'm building a 2.8L bottom end and then boost. Should scoot pretty good!

[Raxe]

My 2.7i SuperETA with 885 head, cam, etc etc put down 165hp and 160tq. I made power all the way to my 6500 redline. What flywheel are you running? Are those 17inch wheel? If so, are they heavy? I think thats also hurting your tq.

Cool, I have the same setup. 272 cam as well? Gives me an idea of where I'm at haha, thanks for this post!

[ohthejosh]

I see you bring it in to a reputable racing bmw oriented shop. Post dyno number of cars in background jk LOL

4doorsftw. badass numbers good sir.

[XvillainousX]

Thats rather disappointing. I was hoping a properly tuned seta/i m20 would do better than that

I still think 170-175 is still very possible. Considering I've seen 3.0 m20 only pull 192hp.. its not all that bad considering how much was put into the motor compared to a 3.0 build. This was our Lemons motor. So little money was put into it.

Cool, I have the same setup. 272 cam as well? Gives me an idea of where I'm at haha, thanks for this post!

Just a little bit more on the car... We ran the 2.3 euro flywheel when we first dyno'd the engine & used a stock I cam, Ebay chip to rev to 6500, and long tube headers. We were surprised that it kept making power to redline. At first we told the tech to rev to 6k. As we are used to seeing and dealing with SpecE30 cars where the hp and tq fall flat on its face after 5k. Like the OP. So when we saw the graph, we were like "keep going"... We later installed an m30 AFM , 19 lbs injectors, and modified the Fuel pressure regulator to get more pressure because the ebay chip was making us run lean. Then the motor blew at an event and cooked the bearings (hose burst). I think if the motor didnt blow, we would have found a way to run an m50 throttle body and graph a m20 TPS to it & used a 10 lb flywheel then dyno it again.

[delatlanta1281]

It had trouble because I was dumb and switched two of the plugs around, but once they were plugged into the right connector it started up just fine. It's exactly like changing a head gasket, only you are replacing the electronics as well. It's all pretty straight forward. Good luck!

Don't beat yourself up, everyone has done that.

[325ix]

Thats rather disappointing. I was hoping a properly tuned seta/i m20 would do better than that :weak:

The stock M20b25 makes 168/165tq at the crank. There is usually around +/- 10% loss of power.

[acolella76]

I KNOW there are ways to squeeze more power out of this motor. I have an M30 AFM lying in my garage that I suppose I could put on and see how that feels. I also have a spare M50 and M20 TB that I could play with too. But the reason I posted this graph was just to prove that even an UN-TUNED 2.7 stroker with a cam makes as much (if not more) than a stock M20B25. My car isn't a dyno queen so I'm not going to spend a ton of money on dyno time to try to make that extra 0.1hp.

I see you bring it in to a reputable racing bmw oriented shop. Post dyno number of cars in background jk LOL

4doorsftw. badass numbers good sir.

HAH yeah the donk is a customer's car and believe it or not that is a twin turbo fox body that is a shop project. It's actually pretty sweet!