the_coupe's NA build cp manley bc
#521
Registered User
iTrader: (3)
Join Date: May 2009
Location: earth
Posts: 1,365
Likes: 0
Received 0 Likes
on
0 Posts
This discussion is becoming redundant, this information has been covered before. One thing I love is reading the technical aspect of how and why
"I've been seeing 0.7-0.8psi of vacuum in the intake manifold, which translates to about 10-15whp from my small experience with tuning turbo 350s - typically 1psi equals about 15-20whp. "
"What we're looking at here is an engine that can develop 100-130whp MORE than factory with only a cam, intake and exhaust tuning. This is no surprise however because the factory heads really are fantastic, the valves are big, the bore is big, the stroke it small... i mean it really is an awesome engine."
https://my350z.com/forum/7596996-post1.html
"I've been seeing 0.7-0.8psi of vacuum in the intake manifold, which translates to about 10-15whp from my small experience with tuning turbo 350s - typically 1psi equals about 15-20whp. "
"What we're looking at here is an engine that can develop 100-130whp MORE than factory with only a cam, intake and exhaust tuning. This is no surprise however because the factory heads really are fantastic, the valves are big, the bore is big, the stroke it small... i mean it really is an awesome engine."
https://my350z.com/forum/7596996-post1.html
#526
Registered User
Thread Starter
iTrader: (4)
Join Date: Aug 2010
Location: SC
Posts: 365
Likes: 0
Received 0 Likes
on
0 Posts
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.
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.
#527
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.
#528
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.
#530
Registered User
iTrader: (3)
Join Date: May 2009
Location: earth
Posts: 1,365
Likes: 0
Received 0 Likes
on
0 Posts
This discussion is becoming redundant, this information has been covered before. One thing I love is reading the technical aspect of how and why
"I've been seeing 0.7-0.8psi of vacuum in the intake manifold, which translates to about 10-15whp from my small experience with tuning turbo 350s - typically 1psi equals about 15-20whp. "
"What we're looking at here is an engine that can develop 100-130whp MORE than factory with only a cam, intake and exhaust tuning. This is no surprise however because the factory heads really are fantastic, the valves are big, the bore is big, the stroke it small... i mean it really is an awesome engine."
https://my350z.com/forum/7596996-post1.html
"I've been seeing 0.7-0.8psi of vacuum in the intake manifold, which translates to about 10-15whp from my small experience with tuning turbo 350s - typically 1psi equals about 15-20whp. "
"What we're looking at here is an engine that can develop 100-130whp MORE than factory with only a cam, intake and exhaust tuning. This is no surprise however because the factory heads really are fantastic, the valves are big, the bore is big, the stroke it small... i mean it really is an awesome engine."
https://my350z.com/forum/7596996-post1.html
#532
New Member
iTrader: (2)
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.
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.
Last edited by Zazz93; 08-25-2011 at 11:33 PM.
#534
Registered User
iTrader: (3)
Join Date: May 2009
Location: earth
Posts: 1,365
Likes: 0
Received 0 Likes
on
0 Posts
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.
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.
#535
Registered User
iTrader: (3)
Join Date: May 2009
Location: earth
Posts: 1,365
Likes: 0
Received 0 Likes
on
0 Posts
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