Dyno Tomorrow

[ptownTSI]

you did way better than I thought!

[markseven]

you did way better than I thought!

Haha! Mee too :D

[zaust]

What you done to the motor fella.

[nitro325is]

that thing is pretty darn lean. Hmmm. This further validates mine and others argument that stock injectors are maxed out in bone stock cars. You need a bit more fuel. decent results. now sell that chip and get a mark d chip/ 17/19# units.

[PeaveyBassist]

Stock injectors are not maxed out. Check a new engine with all new gaskets. It wont be that lean. ANY vacuum leaks and the engine will run more lean than it should. No chip, all stock.



Will

[E30 Wagen]

how can you tell that it's running lean just by looking at the graphs?

[2002maniac]

I like your car. What color is it? Henna?

[Digitalwave]

how can you tell that it's running lean just by looking at the graphs?

Because those are Air/Fuel ratio graphs.

[Kilomph]

A properly tuned engine isn't supposed to have 14.7 AFR the entire powerband, it's not supposed to be a straight line. You make power by leaning/increasing the mixture at certain areas in the revband. The stock injectors aren't maxed out, Alpina used them on their 2.7 (2.8?) liter models.

[blunttech]

Yeah, I have to look into that.

good looking car dude. turbo that thing

[nitro325is]

A properly tuned engine isn't supposed to have 14.7 AFR the entire powerband, it's not supposed to be a straight line. You make power by leaning/increasing the mixture at certain areas in the revband. The stock injectors aren't maxed out, Alpina used them on their 2.7 (2.8?) liter models.

Have you seen a genuine alpina? I have. It had stock injectors yes......but a 3.5 bar FPR not stock 3.0 bar. Saw it a few months back at rhine west bmw. Owner said it was bone stock alpina. FPR said porshe(bosch) though.

replacing FPR for less than cost of 1 injector seems to have prevented alpina from leaning.Makes mechanical and economic sense.

Also stoich is 14.7 and thats not where maximum power occurs.maximum power occurs @ 12.5-13.0 range. Being around 14.7 throughout powerband is not too bad when you are not WOT.
When WOT you want to be in the 12.5-13.0 range for max power. Why else would you go WOT? Headed toward 16+ is piston melting territory.

[ptownTSI]

stock injectors could be dirty causing lower fuel flow. You should run a couple treatments of Redline fuel injector cleaner, or maybe just get 19lb injectors.

[92 mtechnic cabrio]

Huntington Beach huh? Wish I'd seen this thread, I would've come out to hang out. The place was probably like five mins from me.

[markseven]

What you done to the motor fella.

Stock except for a Jim Conforti chip :D

that thing is pretty darn lean. Hmmm. This further validates mine and others argument that stock injectors are maxed out in bone stock cars. You need a bit more fuel. decent results. now sell that chip and get a mark d chip/ 17/19# units.

A properly tuned engine isn't supposed to have 14.7 AFR the entire powerband, it's not supposed to be a straight line. You make power by leaning/increasing the mixture at certain areas in the revband. The stock injectors aren't maxed out, Alpina used them on their 2.7 (2.8?) liter models.

Also stoich is 14.7 and thats not where maximum power occurs.maximum power occurs @ 12.5-13.0 range. Being around 14.7 throughout powerband is not too bad when you are not WOT.
When WOT you want to be in the 12.5-13.0 range for max power. Why else would you go WOT? Headed toward 16+ is piston melting territory.

stock injectors could be dirty causing lower fuel flow. You should run a couple treatments of Redline fuel injector cleaner, or maybe just get 19lb injectors.

Thanks for the input, guys. The crew at Bullet haven't seen the results yet, I'll report back with their opinion. I'll definitely start pricing injectors and check out the Mark D chip. BTW, the engine has less than 25K on her and always gets 91 Octane from Shell/Mobile/76/Chevron. Do you guys think the injectors could have gotten dirty so quickly?

I like your car. What color is it? Henna?

good looking car dude. turbo that thing

Thanks guys! It's Brilliantrot but it looks weird because of the fluorescent lighting in the shop :D A turbo or an S52 would be awesome... drool...

Huntington Beach huh? Wish I'd seen this thread, I would've come out to hang out. The place was probably like five mins from me.

Crap! That would have been cool if you cruised by. :D

[markseven]

Hey guys, I spoke with the guys at Bullet and they suggest a variable rate fuel pump as a solution for the AFR issue. Bav Auto has one, but it's $200. Then more $$ for another dyno run to adjust the new fuel pump.

Bavarian Autosport Adjustable Fuel Pressure Regulator

Get more power and better throttle response from your BMW. This adjustable rising rate fuel pressure regulator enriches the fuel mixture as you accelerate to increase power and improve mid-range throttle response. Maintains stock fuel mixtures at idle.

Is there a less expensive alternative?