RMF header?


stevenEK9 said:
the inlet ports are plenty big, if the exhaust ports are opened up then it helps with unleashing the gains of a trick header

between our builds, it really is just the compression, manifold and head that are "majorly" different.............

shame you are so far away, otherwise we could go race and compare the difference in the 2 cars power wise :p
Click to expand...

I wonder if its these cams not dialled in right. But the compression limiting the ammount we can dial in. :angry:

I absolutely need to race you! But i think you'll kill on ability alone! :naughty:

tama666 said:
I want to race you guys! :(

Is there a way we could do this remotely?

G-tech/Pro RR anyone?
Click to expand...

Nurburgring next year???

Ashy C said:
Could it be a mismatch between the compression and cams?

What power did it make?
Click to expand...

it made 190whp at 8000rpm. If i could carry the torque that bit further i'd easily break the 200whp but it loses the torque at 8k! :angry:

Weasel said:
I very much doubt its your header.
With Toda C's (which are designed to make full power in the midrange and all they way up high) you need to dial in the cams before any initial tuning work is done. Do you have the dial in charts for the cams?.....
If you have a dyno plot, which shows a peak in power and torque early-mid rpm range then the cams could be dialled in incorrectly. This is possible in your case.
Other possibilities...you might not have enough compression to optimise the camshaft capability?.....
Injectors could be maxing out?..........
Click to expand...

Thank you i have really struggled with the header being the cause, My tuner used the dial in chart from Toda and clayed the motor. Compression is high. 13.0:1 static.

The injectors are bosch 1000cc so i doubt these are maxed.
 
I would normally stick with what the person who mapped the car recommends as they are the ones who see what works well together as a package and apply their experience.

I genuinely understand where you are coming from here as have been there.
 
ijwhiteman said:
The injectors are bosch 1000cc so i doubt these are maxed.
Click to expand...

Could these injectors be too big,... 190Whp and 1000cc injectors..

could the problem be that they are nowhere near maxed out... as in they aren't really pushing that hard.. ?? just throwing it out there but you've probably covered this..
 
Last edited:
Topher-EK9 said:
Could these injectors be too big... 190Whp and 1000cc injectors..

could the problem be that they are nowhere near maxed out... as in they aren't really pushing that hard.. ?? just throwing it out there....
Click to expand...

Nah, the ID 1000 injectors are good even at low duty cycles but a ridiculous size injector to use on a 1.8 NA engine
 
so are they overkill ?? or does it not really matter with injectors like these, as in they can cover any sort of build ?
 
Topher-EK9 said:
so are they overkill ?? or does it not really matter with injectors like these, as in they can cover any sort of build ?
Click to expand...
Major overkill for the application. If it was a 500 odd horsepower turbo B series then they would be ideal but for a engine producing not even half that power there are cheaper alternative injectors that would do the job. Cold starts etc can be tricky to dial in with large injectors like that. I have the same injectors in my turbo b16 and it took many mornings of logging cold starts to get it starting and running nice from initial start.
 
tama666 said:
With an ever evolving project ID injectors are a great choice; dont need to buy larger injectors as the projects grows in power.
Click to expand...

Even with allowing heaps of head room the 725cc ID's would have been more than sufficient.
 
Really good thread, give Daz at DNR a call. get him on the case.
 
I would never buy parts just for looks but that manifold looks fantastic!
 
This is very confusing.

So do we all think we can rule out the header?There may be better but not one thats going to carry my torque curve to 9000 and increase whp by 20? In this case?
 
Who mapped the car for you ? They should be able to show you how the manifold is costing you power if in fact thats whats happening.

There was a guy on the ITR forum who designed and build a manifold which made good power. He is a pro engine builder who designed and made it himself I am sure he uses software to design the thing initially. Dunno if he made a jig. will see if I can dig him out.
 
ijwhiteman said:
This is very confusing.

So do we all think we can rule out the header?There may be better but not one thats going to carry my torque curve to 9000 and increase whp by 20? In this case?
Click to expand...

What did your tuner say? Some logging will tell if there is a restriction been caused by either intake or exhaust.
 
in case you want to change headers....

Advanced Street Performance - our quality is your peace of mind

header10_lg.jpg
 
that header looks badass but price is a big no when plm headers are like 250$ lol
but thats just me:)

mugen header maybe is ok on a stock motor but a high cr tuned engine needs a custom header that would be perfect since you need ground clearance radiator clearance etc.
or something of the self that is proven that works like toda or toda replica :meet:
 
aye, got to agree with the above

there is alot of design that goes into the expensive headers etc which help with the power

my engine is only about 12:1 compression on stage 3 cams, it holds peak power from 8000-9500rpm, peaking at 206whp, the power "curve" is basically a straight line too, very linear

everything on an engine build needs to work in harmony to produce both a nice power curve and high peak numbers


not saying that it's the header that makes my engine produce decent power, but it certainly helps
 
oscarsayco said:
[=abunai888]that header looks badass but price is a big no when plm headers are like 250$ lol
but thats just me:)

mugen header maybe is ok on a stock motor but a high cr tuned engine needs a custom header that would be perfect since you need ground clearance radiator clearance etc.
or something of the self that is proven that works like toda or toda replica
you gotta pay to play
Click to expand...

on a set up like stevens yes
on a set up like stock internals and intake-exhaust it's a little bit pointless
thats why replicas dominated over high priced products.
 
Supersprin race vs RMF narrow style, RMF gave extra 2 hp, but lost 25NM. That was on my B20 engine.
 
Vtec6000 said:
Even with allowing heaps of head room the 725cc ID's would have been more than sufficient.
Click to expand...

That was my EXACT thought... Why 1000cc and not 725cc ??? Those 725cc actually have the best spray pattern out of all the ID series. So theres a gain...

ijwhiteman said:
This is very confusing.

So do we all think we can rule out the header?There may be better but not one thats going to carry my torque curve to 9000 and increase whp by 20? In this case?
Click to expand...

No, i'm telling you staight you need a good header to match those cams if you want to extract all the power possible out of them. Its whats holding it back and i've seen this before with my own eyes (i think i told you). I think you need to start weighing up all your pro's and con's. I will say this though : if your going to go for it make sure you do it properly with a **** hot header...
 
Last edited:
You must log in or register to reply here.
Back
Top