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Yes this is my know-how...but in that case from wher coming more power the 182to172???
TY
Better cat, better inlets and better map. Plus they don't make 182.
182
Yes this is my know-how...but in that case from wher coming more power the 182to172???
TY
freer flowing cat, better inlets, better cat back system, better map
as been said 172 is better for top end 182 for mid range torque
Martin_172
ClioSport Club Member
ive got a 182 manifold on my 172.
improved mid range torque AND top end power....
improved mid range torque AND top end power....
Clio RS 172
Martin_172
ClioSport Club Member
yes, along with matched inlets i went from 173bhp to 188bhp
RS RIP
i have sent you mine !?
... ohhhh uncertainty ; what to do , what to do ?!
It improves midrange , believe us..
It's a b**ch of a job though.. glad i was'nt doing it myself ! My wallet was'nt so glad though...
Did you ever try just the de-cat on the 172 manifold or did you just go straight for the 182 manifold?
If you did de-cat with 172 manifold how does it compare the 182 manifold with the de-cat pipe?
Clio 172 RS2
Clio 172 RS2
Inlet or exhaust?
Matching the inletports or just fitting a 182 exhaust mani...
Matching the inletports or just fitting a 182 exhaust mani...
RS RIP
Like i said, The 182 Exhaust manifold is a must when doing cams and all inlet goodies.
(such a setup WANTS more IN + more OUT)
when not doing cams, i would'nt do the 182 manifold i'm thinking.
Only exception ; when not doing cams but going for the new Angelworks inletmanifold i would DEFINATELY do the 182 manifold. More in + more out (supercup thread)
4-1 172 manifold is absolutely fine and preferable if you're aim is the maximum possible power.
The 182 manifold doesn't 'flow' any more or less than a 172 manifold.
Cheers
M
Clio Sport 172 ph1
If it doesn't why is there a difference in output diameter ? 172 manifold has only 50mm at the end, 4-2-1 is 60mm at the end.
I'm no expert but since all good aftermarket exhaust systems are 2,5" Isn't putting the 4-2-1 mani, together with suited exhaust system, only logical thing ?
I have a question on this, I now own a 172, but had a 182 before, same mods, and let me put is this way. no way I can race a 182 and win unless the other guy is a dunkey, they are always faster, specially if testes in roll, from stand still difference is smaller, but they are always faster. Also midrange is meatier in the 182, can definetly say so, at least in feeling, much better. So, is this difference down to the mani? I must say my 172 has a 182 cat, so that has been discounted.
182
Hi matt so whats the best set up with cams then?
Its not just about the performance. The other advantage of the 182 mani is the ease at messing with the cat. Turns a 2 man job of the 172 version into a 1 man job with a 182.
If you can do it cheap its worth it imo and especially if your running in conjunction with other breathing mods.
If you can do it cheap its worth it imo and especially if your running in conjunction with other breathing mods.
RS RIP
i think you've mis-written here ? How can the 172 manifold be "preferable" (over the 182 mani??) when aiming for the max power ?
The 4-2-1 design is for better flow ; Why would Renault change the design of the manifold if there was nothing to be gained..
You seem to know pretty much about cars, surprised that your saying this though :S
When people say , it's not worth all the hassle, this i can understand because it's costly and a pretty major job.
lift number 1 @ btm
from what i understand, the 4-1 gives better peak power, while the 4-2-1 gives better torque.
iirc. the extra 10ps with the 182 caused a lower torque figure which was improved with the exhaust mani.
don't f1 cars run 4-1 manifolds?
4-1 will typically yield a better figure at a specific rpm (or close group of rpm's), usually set as the point of peak power.
This engine speed will depend on length.
4-2-1 will typically yield a gain over a much wider spread.
Its all down to length, and how that effects pulse tuning effect. Flow as in basic cfm isnt the governing factor.
Its impossible to say/guess on anything other than std (assuming renault designed them properly) which will work best. Cam profile is the main influencing factor, and seen as this is one of the first areas to tune, previous ideals can soon be chucked out of the window.
Power gain going from 172 to 182 manifold is within the RR error limits. So even a back to back test would not exactly give the numbers. Also, most people do some other mods together with the 182 manifold change so I have not seen any RR data only showing manifold gain yet. I am very happy with the sound of it and the overall gain combined with the custom map from Henk@Fastchip.
RS RIP
I do'nt fully understand the pulsing theory, and a slight knowledge-lack of English language ..
I thought the pulsing spoken about took place at the in + outlet of the engine ? And the smoothening out of the ports (when not worked on right) will worsen the pulse effects ? When looking at the OEM inlet ports they look very rough, almost like being worked on with a chizzle (as someone on here said). When seeing some of the further worked on ports they are smoothened out which supposably does'nt help the pulsing ?
Martin_172
ClioSport Club Member
ClioSport 172 Cup
Its all about getting the balance and flow right for each cylinder pulse so that the pulses from the cylinders do not collide(causing them to slow down) as they enter the middle section, the 4-2-1 design is more efficient than 4-1 as the increase in length causes the exhaust gases to speed up, they then exit the exhaust more quickly. 4-1 produces slightly more back pressure and slower flowing exhaust gases than 4-2-1. So slightly better acceleration from the 4-1 BUT reduced torque across the rev range.
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