1uz lower manifold thread

[prasac]

not too clutter OKE's thread







manifold


$350 no frills plenum

[Justengt4]

Good move. I'm not going to rehash this discussion again at length, having done it to death elsewhere, but the short summary is:

On a stock inlet power noses over around 5300rpm...regardless of boost etc. An open wheeler racer, using a UZ, changed nothing but the inlet manifold and peak power suddenly moved out to 7000ish rpm. Why we all asked? previously it was thought the extremely mild cams would be the biggest blockage but this egine was entirely stock other than inlet and exhaust and the only thing changed for the before/after was the inlet.

Anyways, after extensive discussion and wanking on about fluid dynamics etc etc the general consensus was the thickening boundary layer along the long runners, combined with their ovaled shape, effectively made the inlet port very small. You can still crank up the boost and make more power, but you just shift the curve upwards, you don't extend peak power out past that 5300ish rpm.

Any inlet that changes the runner length or x-sectional area has extended out the peak rpm and obviously peak power as well. We are talking 10 or so real life examples now. Even the roughest short runner efforts have been an improvement over stock.

Why the Capri delivers a mildly better peak power rpm, i put down to the custom plenum, which shortens the runner length and allows a front entry i seem to recall. Plus the port matching....and of course there would be gains to be had from the ported heads and cams. It all adds up to actually make this setup significantly different from a completely stock setup. I strongly suspect than even an extrude hone (which would look completely stock) would give a decent result.

Anyways, swap it out and reap the rewards

PS Prasac, you might not see more than 50rwhp over your current setup (i think you will), but over a genuine stock setup 150rwhp is easily concievable.

[prasac]

it's making power to around 7500rpm, that is significantly more, it flattens out around there, we have spun it to over 8000rpm on the dyno power stays up there and it proves it on the track also.

so the top part of the manifold is shit, the actual lower manifold with a custom plenum is fine is that what your saying?

like i said before even in Scott's thread, before the heads were touched, back in 2009 it was showing power to almost 7000rpm (it did not roll over at all @ 5500rpm) with factory heads, cams, lower manifold just had the custom plenum. how do you explain that? obviously that is proof that the lower manifold is in fact fine. its the shit top half, letting the engine down and not the lower half.

[prasac]

how much power are you making now and what has been done to the engine?

[Justengt4]

If you bothered reading you would recall that a stock plenum with a short runner lower delivered more power on less boost...another fluke i guess? Do both upper and lower and get more gains, duh. I don't recall ever stating that the sidefeed plenum was good either Whatever, your shit clearly don't stink and what would the rest of us know.

411rwkw on 16-17psi is the best mine has done on a totally stock engine (E85). Turbos (babies compres to yours) aren't into peak efficiency until 23psi, but this is more than enough power for something that has to turn corners.

[prasac]

of course a short runner will make more power, that's what they are designed to do

like i said it will make more power, its not making more power that i think is impossible, its the numbers i hear floating around are crazy. over a completely stock intake manifold yes, possibly 100hp but i don't think any/much more. compared to what we have now, no way, i don't see 150hp. i believe as we are now with the custom plenum it might pickup 50hp with a custom lower, if it does we are happy any gain is good.

[JZK25]

Is there a point to this thread?

Go get someone to make a good manifold for the car and tell us what happens.

[ALLMTR]

Is there a point to this thread?

Go get someone to make a good manifold for the car and tell us what happens.

+9.7

[prasac]

Is there a point to this thread?

Go get someone to make a good manifold for the car and tell us what happens.

Maybe u can make us one. We are going for 1600hp with new motor the manifold u make we should pick up 240Rwhp going by ur maths lol.

When u make 1200hp@30psi with a 1uz using one of ur manifolds then come n criticise what we got.

[Cracka]

where's the accept challenge button?

-not cracka. myshortone

[vet 180]

I think this challenge should be accepted.

less than 50HP gain he gets it for free. More than he has to pay!

Both of you put your nuts on the table and do it!

[prasac]

we're very happy with the fabricator that we have at the moment, if he can make 1200hp efficiently using a fucked manifold design, imagine what he can do if he put his mind to it we have proved a lower manifold can work even after everyone else has written it off. our fab guy also has a proven track record with many many 1000hp+ cars. also both him and our engine builder have many many years R&D on 1UZ's so they know what works.

happy to compare if JZK25 builds another one for someone else and he wants to back to back it with ours, and if it works better happy to buy one.

[Billzilla]

we're very happy with the fabricator that we have at the moment, if he can make 1200hp efficiently using a fucked manifold design, imagine what he can do if he put his mind to it we have proved a lower manifold can work even after everyone else has written it off. our fab guy also has a proven track record with many many 1000hp+ cars, both him and our engine builder have many many years R&D on 1UZ's so they know what works.

happy to compare if JZK25 builds another one for someone else, and if it works better happy to buy one.

I've never really looked at one before, but after doing so I reckon you could easily get a lot more power by pissing the whole thing off and making a simple individual runner type manifold that's both straighter and shorter than the 1UZ version.
It looks far too long and it certainly has far too many curves.

[prasac]

I've never really looked at one before, but after doing so I reckon you could easily get a lot more power by pissing the whole thing off and making a simple individual runner type manifold that's both straighter and shorter than the 1UZ version.
It looks far too long and it certainly has far too many curves.

shorter/straighter runners will make more power no doubt. i just don't see it making the power that alot of people suggest here that it will. we might see 50rwhp @ the same boost.

anyone that knows 1UZ's knows 1150-1200hp at 30psi is not a shit number. that is the reason why i don't see us making too much more power, where we making 1000hp@30psi then yeah but when ur already making that power and know what other guys have made with their better combo's we know there is not that much power in it.

[Billzilla]

shorter/straighter runners will make more power no doubt. i just don't see it making the power that alot of people suggest here that it will. we might see 50rwhp @ the same boost.

Yeah I don't know what the numbers would be either, but I am very sure they would be usefully more for the same boost.

[JZK25]

Maybe u can make us one. We are going for 1600hp with new motor the manifold u make we should pick up 240Rwhp going by ur maths lol.

When u make 1200hp@30psi with a 1uz using one of ur manifolds then come n criticise what we got.

I wasn't criticising your fabricator or current setup. I was simply saying that this thread is pointless as you say it won't do anything for power, but everyone who has replaced the bottom half says it will. Repeat ad nauseum.

If you do get a manifold made, I recommend you don't cut the std flange plates off and weld to them, they are a cunt of a shape. Some dude sells billet flange plates for them that suits a more upright runner for $6-800.

Try to remain calm, we are not racing for pinks or saving the farm.

[prasac]

I wasn't criticising your fabricator or current setup. I was simply saying that this thread is pointless as you say it won't do anything for power, but everyone who has replaced the bottom half says it will. Repeat ad nauseum.

If you do get a manifold made, I recommend you don't cut the std flange plates off and weld to them, they are a cunt of a shape. Some dude sells billet flange plates for them that suits a more upright runner for $6-800.

Try to remain calm, we are not racing for pinks or saving the farm.

I never said it won't make more power I said it won't make 100hp+ more. I know it will make more power never argued that.

[BoganDAVE]

isn't this all settled by putting the hogan on Joe's car?

[Shifty]

i think there should be more boxing gloves

[prasac]

isn't this all settled by putting the hogan on Joe's car?

Hogan's i think make a 1UZ manifold, have seen on in the catalogue looks like a UZ one. new one will probably be something like a dual 2.5''-3'' cylinders with a straight runner. runner length will be half of factory.

[Mr Jones]

isn't this all settled by putting the hogan on Joe's car?

You mean the one on prasac's car? I don't think it'll fit…

[millsi]

shorter/straighter runners will make more power no doubt. i just don't see it making the power that alot of people suggest here that it will. we might see 50rwhp @ the same boost.

anyone that knows 1UZ's knows 1150-1200hp at 30psi is not a shit number. that is the reason why i don't see us making too much more power, where we making 1000hp@30psi then yeah but when ur already making that power and know what other guys have made with their better combo's we know there is not that much power in it.

That is an outstanding number no doubt, but why would you not at least try a new manifold. If it makes fuck all difference then you
can win the interent, if it works then it's 7 second club membership fees.

[BoganDAVE]

I meant the one thats on Paul's car now, does that have vvt heads or someshit?

[prasac]

That is an outstanding number no doubt, but why would you not at least try a new manifold. If it makes fuck all difference then you
can win the interent, if it works then it's 7 second club membership fees.

$$$$$'s why change something when it's working? Will run a 7 with that manifold. No point spending 2-3k Wen a new engine is going in.

Give no fucks about winning internet, even if we make only 50hp people will say it's a fucked manifold design and there designs will pick up 200hp lol.

[prasac]

I meant the one thats on Paul's car now, does that have vvt heads or someshit?

I got a Ford modular motor in mine. If we had a modular motor in the Capri we'd be running mid 7's by now lol.

[Mr Jones]

Those silly overhead cam engines all look alike must be the Asian heritage