Search found 628 matches

by 350matt
Sun Nov 18, 2018 9:33 pm
Forum: RX-8 Discussion
Topic: Fuel Trims
Replies: 5
Views: 158

Re: Fuel Trims

I'd agree
sounds like a vacuum / airleak to me
if you spray some lighter gas / brake cleaner around all the rubber hoses / possible leak paths with the engine running and listen for it revving up then you've found your leak
by 350matt
Sun Nov 18, 2018 10:03 am
Forum: RX-8 Discussion
Topic: Std. Header tune
Replies: 11
Views: 301

Re: Std. Header tune

the toyo manifold sold by many outlets is basically the same pattern for all of them and its made down to a price, and they are rarely flat unless you buy one of the better made ( £500+) items if you look on the flange of it does have a smaller hole for the middle but thats about it If you take a lo...
by 350matt
Sun Nov 18, 2018 8:11 am
Forum: RX-8 Discussion
Topic: Std. Header tune
Replies: 11
Views: 301

Re: Std. Header tune

despite its initial appearance and its oil consumption the triangular wonder is a 4 stroke engine one interesting thing though is the flow of the centre ports compared to the outer ports as they are smaller and won't flow as much so will need a different length primary as the effective timing is dif...
by 350matt
Fri Nov 16, 2018 10:30 pm
Forum: RX-8 Discussion
Topic: Has anyone used K-Seal?
Replies: 13
Views: 372

Re: Has anyone used K-Seal?

Agreed
used in moderation ( like anything else) K-seal is fine
by 350matt
Thu Nov 15, 2018 10:15 pm
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

unless your injectors are up to 80%+ duty cycle then there's no need to change them and 90% of the time you want the injector to be 'just' big enough to give you the best control of the pulse width at high speed and the stock RX8 injectors are 400cc / min? which should give injector cover up to 400b...
by 350matt
Thu Nov 15, 2018 6:42 pm
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

Why would going up in injector flow rate give more power? unless its being throttled back currently as the current injectors are maxed out?
by 350matt
Wed Nov 14, 2018 9:51 pm
Forum: RX-8 Discussion
Topic: OBDII Data
Replies: 25
Views: 564

Re: OBDII Data

that and not much torque so its rare to be traction limited
by 350matt
Wed Nov 14, 2018 9:47 pm
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

Theoretically, a 231 uses 213g/s at 8200rpm. A straightforward pro-rata increase to 282g/s would equate to 306bhp at the fly (say 245whp). C'mon, get it on the dyno.... :twisted: :thumleft: I can’t believe it is that high. Only one way to find out though. It is peripheral intake and exhaust ported?...
by 350matt
Wed Nov 14, 2018 9:31 pm
Forum: DIY
Topic: Engine stand adapter
Replies: 20
Views: 513

Re: Engine stand adapter

I used one of these when I rebuilt mine https://www.manomano.co.uk/engine-stand-and-hoist/engine-stand-engine-mounting-support-450kg-1000lbs-810703?model_id=810703 there's enough range of adjustment to bolt it up on the front plate Biggest headache is finding enough of the weird M10 x 1.25 ? ( I thi...
by 350matt
Tue Nov 13, 2018 8:07 pm
Forum: RX-8 Discussion
Topic: Coils
Replies: 25
Views: 807

Re: Coils

be interesting to see how Carl's latest big boy coils perform
by 350matt
Tue Nov 13, 2018 7:55 pm
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

reading through that FD power comparison it showed a street port was rather beneficial, however this is all at 350+ bhp levels of airflow

forced induction is the only way chaps.....
by 350matt
Tue Nov 13, 2018 12:07 pm
Forum: RX-8 Discussion
Topic: Coils
Replies: 25
Views: 807

Re: Coils

interesting idea as we use the honda CBR coil a bit at work on all sorts of things as its proven to be very versatile

and its possible to modify a coil on plug coil to have a remote lead , you end up machining bits of PEEK to support the lead end and glue ti all together
by 350matt
Mon Nov 12, 2018 7:48 am
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

I think the reason for the lack of detail is that we simply don't have more hard data to add. The point of Pete's post was to highlight that porting on its own doesn't seem to do much and the only positive evidence for doing so is that racing beat graph , which is 'polluted' by them adding an exhaus...
by 350matt
Sun Nov 11, 2018 10:37 am
Forum: Naturally Aspirated
Topic: exhaust port major chamfer...
Replies: 21
Views: 796

Re: exhaust port major chamfer...

Fair enough Pete I too would love to see a before and after dyno, its sadly very rare on this platform OK off on a slight tangent though to pick up mr 13 blacks suggestion of variable overlap how about a modified port just on the centre ports? and then modify a manifold to have a wastegate controlle...
by 350matt
Sun Nov 11, 2018 8:18 am
Forum: Naturally Aspirated
Topic: exhaust port major chamfer...
Replies: 21
Views: 796

Re: exhaust port major chamfer...

I'd be surprised if that was the case Pete they seem like a reputable firm and its quite a bit of effort to go to for no gain I think its telling that the profile of the port also seems to follow the RB port and its just the entry point of the port that's been modified so the opening area of the thr...
by 350matt
Sat Nov 10, 2018 10:00 pm
Forum: Naturally Aspirated
Topic: exhaust port major chamfer...
Replies: 21
Views: 796

Re: exhaust port major chamfer...

Bududom tish!

to my mind the area increase is secondary to the fact it starts the turn earlier and so reduces angle and so the pressure drop over the port 'should' be a lot less
by 350matt
Sat Nov 10, 2018 7:50 pm
Forum: Naturally Aspirated
Topic: exhaust port major chamfer...
Replies: 21
Views: 796

Re: exhaust port major chamfer...

and does it work?
by 350matt
Sat Nov 10, 2018 5:05 pm
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

So does an engine dyno use the 8s intake and exhaust? Nope. Does everyone have access to one to get comparative data? Nope. Does it give you any real world data on what you will achieve to the wheels? Nope. I fail to understand how a rolling road or hub dyno can do more harm than good? Stuff like A...
by 350matt
Sat Nov 10, 2018 9:56 am
Forum: Naturally Aspirated
Topic: exhaust port major chamfer...
Replies: 21
Views: 796

Re: exhaust port major chamfer...

Oh yes , care to spill the beans on whose work?
by 350matt
Sat Nov 10, 2018 9:48 am
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

this opens up the debate about wheel hp , brake hp , correction factors and different rolling roads personally I have a strong dislike of rolling road results being quoted as the absolute figure as most roads have very poor air temperature control and don't bother logging the air temp as its going i...
by 350matt
Fri Nov 09, 2018 10:33 pm
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

So talking of porting I'd be interested if anyone has tried this heavy chamfer mod to the exhaust port, as it looks like it might actually go some way to helping mitigate the right angle turn

viewtopic.php?f=136&t=77495&p=1162023&h ... t#p1162023
by 350matt
Fri Nov 09, 2018 9:26 pm
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

The views and experiences posted so far are varied and I am sure many more will follow. I am not going to offer any opinion on the attached graphs but comments are more than welcome. My original engine ran out of breath at 87k and just would not start. I had an angine lying in the garage, like you ...
by 350matt
Fri Nov 09, 2018 6:18 pm
Forum: Naturally Aspirated
Topic: Is porting for power a myth?
Replies: 120
Views: 2915

Re: Is porting for power a myth?

I think we've already have a sniff of the potential here, as V8 power 's car with the Peripheral exhaust port and renny inlets is promising to make some large numbers and there must be others already out there yes the renny has more area but as Pete has alluded to, the opening times / time to max fl...
by 350matt
Wed Nov 07, 2018 8:22 pm
Forum: Aftermarket
Topic: D585 Coils
Replies: 13
Views: 390

Re: D585 Coils

agreed
I'm eagerly awaiting mine but even out of offer they promise to be about the £250-300 mark and should be a better part than the 585's
by 350matt
Tue Nov 06, 2018 9:36 pm
Forum: RX-8 Discussion
Topic: I’m a bit worried
Replies: 26
Views: 953

Re: I’m a bit worried

If you remove the ESS sensor and measure its resistance it should be 1100ohm replace it if its more than this and check the state of the wiring its can go very hard and brittle down there as you've disturbed it to do the test I'd say its likely you have a wiring fault and a rough speed signal if you...

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