tuning advice please

[DomJolly]

well i have posted many a thread about my car. ok, these are the performance mods so far:

piper fast road cam
induction kit
decat
milltek centre pipe
remus twin square exit backbox

the decat has improved air flow substantially, and with the cam fitted, i now get more power from 3.75 - 6k then ever before, and if i take it to 5.5k the gear change will fall back within the revised power band.

the cam has not reduced low end, but the decat has in order to improve revability.

as the cam is a mild cam to improve mid range, if i refitted the cat, i should get the low end torqueyness back as standard, but will i get better mid to high end power than standard due to the cam, or do i need to keep the decat on for the cam to really be working.

i know flowed head is the way to go, but surely that is just gonna improve high end power - which is not really what i exclusively want. thrashing around gets on my titties a bit!

i am trying to decide to get manifold or remap/chip. cannot justify buying both!

the aim is... really torquey mid range - i.e. 2.5 - 5k, not high rev power!

so with my desires in mind, what would you all suggest: manifold or chip, and with or without cat.?

and please don't say - buy a new car!

:confused:

[DomJolly]

...regarding revvyness and torque: when i test drove the 2.0 16v, and many years before a 205 1.9 GTI and when i owned a renault 19 16v (lasted 2 days - french engines and my driving don't go!)- i was dissappointed with the power until i learn't that you had to floor them where the power was at the top. i like the vr6's characteristics as i find them very torquey and they rev great too, but it's the torqueyness i love.

just to clarify on what i mean by wanting 'low - mid range':o

[edc]

A flowed head should give noticeable improvements throughout the rev range. If it was previosly breathless at the top end then increased airflow might help you to rev a bit more freely.

I'd leave the manifold, work over the existing one and get a remap.

[DomJolly]

it doesn't seem breathless now, but what im wanting is low-mid torque. the idea of the cam was to get more pull past 3.5k and the decat was to help it breath and both have worked. but as i am considering remap/chip or manifold, should i replace the cat to get the low end torque back, and the manifold or chip with the cam do the rest from mid - high.

???

i'm not trying to get a 16v out of an 8v. i'm not too keen of "revvy" engines. i want torque, with a bit more power than standard from mid upwards.

what does the manifold do? i understand you can have 4-3-2-1 or 4-2. is one torquey and one revvy? obviously the cat increases back pressure = low down torque, so getting a torquey manifold with the cat out doesn't make sense, nor does getting a revvy manifold with cat in. so i suppose the manifold is a messy area and if i was getting head done then i should get a revvy manifold, keep the cat out and get it remapped - but that's way too much dosh and i might not want revvy revvy.

so do you agree that putting the cat back in will give the low torque back due to increased back pressure?

then the cam will do the work where the engine would run out of puff past 4.5k if standard...

then a remap/chip to even things out and grab some more mid range gain.

that might shut me up>

or as above but keep cat out and see better bhp gains from cam, decat, inductionkit with the higher end power and smoother accelleration from the remap.

i am sooo undecided.




:confused: :confused: :confused: