and what lower plen was this? was it non-rev or revup? did it have any work done to it? if the couple ever puts in his worked lower plen, maybe he will pick up another 10-15, which would account for some of what this post shows

 

here we go again

 

I am sorry to junk on your thread, this stuff just drives me crazy.

 

its good discussion tho, and youre selling the car anyway

 

Debate is good, but making statements and demanding others prove them wrong is irritating. Every build is different and has so many variables it is impossible to compare them.

This thread's build has nice power gains and has the mods that he is arguing make no power.

 

lol what does me selling my car have to do with anything? doesnt mean i havent proven what i have proven and know what i know. much of the debate is stupid because it is as common as the clap in a public high school these days.
again, debate is good.....but lets have some common sense and a lil professionalism about it. and if you want proof of so many things, do it your damn self instead of demanding it from others. simple.

 

He used a worked over non rev lower, and you can see he enlarged the neck (as well as a bigger throttlebody) on the upper portion of the manifold. I'm glad to see you are trying to look at the bigger picture.

 

Small bumps in compression won't do much, and again, the restriction on these cars isn't the head, it the intake manifold. Working over the head and throwing in cams isn't addressing the issue.

On BMWs, the S52B28 motor came with a manifold that could only flow 195cfm through its ports. You could works the head over, add cams, and do all the bolt-ons and only see 20whp more than before. Or you could swap on a older M50 intake manifold with bigger ports and a flow rating over 280cfm and make that power with half the work.

Does the head flow 280cfm? No, but to give you an idea how much of a restriction the intake manifold is, a fully bolted on cammed S52 with an S52 manifold will make about 230whp. The same car with an M50 manifold will be 250-260whp. 30whp more, and even larger gains at redline.

.
Of course, this is an overly simplified example, but the same principle applies here: find the restriction and work from there. Everything needs to work together for best results.

 

That's all fine and great, but WHICH one specifically is the best? Judging by the intake shootout, the plen spacer and worked non-rev gave the best results from what I could see

 

In this thread I have quoted, did he use a worked lower plenum here as well?

 

Yes, he used a non rev lower.

 

I think SG used a basic Non-revup lower originally, but then decided to try out the rev-up lower and his custom upper with an LSx throttle body. The updated setup tweaked the powerband and delievered more top end, as expected. Im currently trying to get something similar going after seeing issues with just using the rev-up lower and losing a little bit everywhere except for the very top end of the rev range.

I still think the best bet is the MREV2 and spacer, but I wouldn't turn down a Cosworth for a good price regardles of the claims.

As for compression, honestly I didn't think it was good for really anything measurable. I originally built my bottom end without cams and it felt snappier, but the dyno showed it was just average for a full intake and exhaust setup. I remember finding a compression simulator somewhere and plugged in the numbers, it suggested about 5-8 hp could be expected from the 1 point bump. I would believe the 5 hp estimation was pretty accuarate, but youu could easily write that off as dyno variation.

 

Ok, was it worked tho? I just want to make sure the gains of lifting the upper aren't the same gains the working of the lower produce, if that makes sense

 

I just wish it was easier to sort through all of SG's testing. Just seems like there are always some variables not explained.

I would like to see bench flow tests done on each manifold setup. I don't buy the excuse, "well it will be different on each setup" philosophy. With other parts, yea that applies, but the manifold either flows past a certain cfm, or it doesn't, plain and simple.

 

and thecoupe, what i meant by the selling the car comment was that you would prob be ok with this discussion in your thread since you are selling anyway. but if not, i will gladly make another thread. i meant no disrespect

 

all fine n dandy with me as long as nobody is bashing anyone lol

 

its officially getting parted out now guys. got a whole thread on driver.

 

I can't believe it! Good luck!

Are you going to change your screen name to the_sedan?

 

lol yeah i will. luckily ive got alot of interest in all my parts but the motor so far.

 

What are you going to do with the car without a motor? Or are you asking for a trade?

Have you tried selling as is?