big upgrade!

[SS Ball3r]

Just baught group n race cams and 21 lb injectors for my '92 325is! cant wait for them to come. I know, pointless thread. Will be car benefit from a bigger MAF from this setup?

[RADI0ACTIV3M4N]

You are going to want some good tuning for that to benefit you properly.

[Nataliator]

I wonder if those cams actually make larger injectors necessary.

[Paul NJ]

^^ maybe not unless he gets a Bigger MAF (3.5)

[SS Ball3r]

so getting a bigger MAF would be a good addition to this? How does a bigger MAF improve power?

[Gene1219]

so getting a bigger MAF would be a good addition to this? How does a bigger MAF improve power?
Coming from a different platform, but the general rule was if you were going with bigger injectors, to gain benifits of them a proper sized MAF (to the injector lbs) would be needed. I'm sure same could be said of the e36.

[pbonsalb]

Do you think you will be over 200rwhp? A 3 inch MAF was fine for that power level on the E36 M3 with 21 lb injectors. At some point more like 230 whp and up, people start using a 3.5 inch MAF and 24 lb injectors. I would tend to doubt you are close to that level.

[SS Ball3r]

i plan on dynoing the car as soon as i get all this in. i honestly think i will be right at 200 with all my mods. So, should i get a bigger MAF or will it not matter?

[exodus454]

i plan on dynoing the car as soon as i get all this in. i honestly think i will be right at 200 with all my mods. So, should i get a bigger MAF or will it not matter?

Are you going to get it dyno tuned?

If so, the tuner should be able to tell you if you're pushing your current MAF to the limits. I think you're right on the line, honestly.

[SS Ball3r]

cool. i might get it dyno tuned. we will see. im just excited to get cams :)

[Big Empty]

I doubt you'll get 190rwhp. I think the m50 dynos at around 160rwhp, and m3 power isn't had by just cams, intake and tune.

[pbonsalb]

i plan on dynoing the car as soon as i get all this in. i honestly think i will be right at 200 with all my mods. So, should i get a bigger MAF or will it not matter?

At 200 rwhp, a bigger MAF won't make any difference, and you won't get much more power than that out of a stock block 2.5L with just bolt on/in mods in naturally aspirated form. I would not spend the money. Spend some money lightening the car to improve the power to weight ratio -- small battery, lightweight seats, no spare, lighter exhaust parts, remove AC, pull rear seat, light wheels and tires, etc.

[SS Ball3r]

you dont think that with headers, exhaust, intake, cams, bigger injectors, i wont be at 200?

[Big Empty]

no man. think about it. the m3 engines already have .5-.7L of displacement on you, plus the already have the S cams. And the m3 engines put down about 200rwhp. Not bashing your mods because its a good upgrade and all, its just optimistic to get 200rwhp from a non vanos and those mods.

[SS Ball3r]

either way, for what i paid, i coudlnt go wrong.

[Big Empty]

yep! you'll get some awesome gains. GL

[pbonsalb]

you dont think that with headers, exhaust, intake, cams, bigger injectors, i wont be at 200?

I'd say 200 rwhp is a possibility, but that you won't be able to get enough more than that out of the 2.5 to warrant the bigger HFM -- I would not consider one unless you are at 230+ rwhp. BMW started using them at more like 240+ rwhp (Euro E36M3). And you would get the 200 only if those group N cams are pretty radical, in which case your bottom end will be soggy and you will have to have a tune specifically for those cams. If you end up with a weak bottom end, bring some of it back with a higher numerical ratio rear end, which will also work well with wilder cams on the top end. I changed my diff first from a 3.23 to a 3.38 and then from a 3.38 to a 3.64.

[Nataliator]

I doubt you'll get 190rwhp. I think the m50 dynos at around 160rwhp, and m3 power isn't had by just cams, intake and tune.

dyno sheet library shows m50TU with cams and software in the 190-205 whp range (depending on other supporting mods)
and the m52 with cams and tune in the 200-215 whp range (also depending)

I was having tough luck finding non-vanos dynos with hot cams, but i could definitely believe 190 whp, at least.

[SS Ball3r]

dyno sheet library shows m50TU with cams and software in the 190-205 whp range (depending on other supporting mods)
and the m52 with cams and tune in the 200-215 whp range (also depending)

I was having tough luck finding non-vanos dynos with hot cams, but i could definitely believe 190 whp, at least.
thats what i like to hear :)

[Big Empty]

1) lots of those dynos are fuct (see recent m3 rwhp thread)
2) this is an NVM50, chipping is less responsive
3) the s50 already has said cams, and an extra half litre of displacement. therefore, adding said s50 cams to the 2.5L will not yield the 50hp needed to match that of the s50.

i'm not bashing, its just facts. if you can get a proper chip for the new cams, i'd say 190rwhp is doing awesome from these mods.