spike Posted April 28, 2004 Posted April 28, 2004 what sort of power increase am i gonna see from a janspeed zorst and janspeed 4-2-1 manifold? i thank you .oO(spike)
Fiona Posted April 28, 2004 Posted April 28, 2004 Maybe 5bhp? Hardly noticeable but you'll enjoy the better noise! Fiona
spike Posted April 28, 2004 Author Posted April 28, 2004 cross posted on bcbbs to get a broader responce. seems like a big wedge of cash for not much, or am i missing the point? im gonna have to find out the dif between torque and power now lol
Ben (T25) Ruz Posted April 28, 2004 Posted April 28, 2004 You will get more torque as discussed but the cost (with fitting) is alot. I would suggest the backbox and a hurricane or K&N. It will give you a little more BHP but will make it sound much better. I went for the hurricane but each to their own. Ben
daves2111s Posted April 28, 2004 Posted April 28, 2004 Yes tend to agree the back box and Hurricane first, then sports cat or bypass, then 4:2:1. I've got to the first two on mine and without doubt the car is quicker & sounds great too. The 4:2:1 certainly will help the torque figure... which on an K series is in very short supply. I would guess the fitting costs are fairly high for the manifold too. Might pop into Horizon and ask the question or perhaps just borrow their 275bhp 1.4ltr K series and pop that in BHP should be about +5 with the sports cat. Now for the downside............ it wrecks your mpg figures and tyres cos you just can't keep off the loud pedal Dave
spike Posted April 28, 2004 Author Posted April 28, 2004 Horizon are who ive been chatting to. They are getting me a janspeed zorst for def. I took my car back to them today cos it had developed a ticking noise.. turns out that its the joint after the manifold and before the cat thats got a little hole/crack in it. [is that the flexi joint? i have no idea ] Might just get that fixed [they are calling back with prices] but i suffer seriously from what me and my friend call 'for a few pounds more' syndrom. Do i sort out just the problem, or, for a few pounds more.... change the manifold, decat [or sports cat, zorst and hurricane it up.... [ok so its more than a few pounds more, but you get the idea] Bare in mind, the car is totally standard, and has been for my 2 years of ownership All of this depends on the figures that Horizon come back to me with... spike..
GCCK Posted April 29, 2004 Posted April 29, 2004 The exhaust can help you make a nice farty noise but the benefits of free-er flow are much less apparent if you don't push more mixture in through induction & head. Fairly obviously, the hub of an engine is the combustion chamber and gains radiate out from there. Get the head done if you want Bhp with bigger valves, porting etc. Inlet manifold & induction will help you get more mixture in and more agressive cams will keep the doors open longer to again get more mixture in as a maximum but to the detriment of torque & driveability at lower speeds. Once you get to 155-160Bhp, the standard CPU can't cope with metering, so you need to chuck it out for something more special e.g. Emerald (= big wedge). Std S1 118Bhp PTP Sport (Head + Inlet manifold) +20 Bhp PTP Sport with ITG induction + Janspeed sports cat + exhaust + 5 Bhp They don't insist on the manifold at this stage of development although they do for their 170 Bhp kit. Consensus is that although the Janspeed 4-2-1 manifold improves mid range torque, it may only be benficial in those high output engines where mid range torque was being compromised by big valves and wilder cams in the first place. Conversely, Racespeed include a 4-2-1 manifold in their Rs150 kit, but then it's a Janspeed developed kit... Graeme Graeme
Ben (T25) Ruz Posted April 29, 2004 Posted April 29, 2004 I would be interested in the price spike - I looked at the 421 a while ago and bruce (ragtop roasters) supply's and fits for £525. I might be making an arse of myself (I am not a mech) but is the inlet the part after the throttle body and before the head ? If so can you change it on it's own and get an improvement as it seems to be part of all the head upgrades. Ben (hopefully making sense)
Scott_Mac Posted May 3, 2004 Posted May 3, 2004 Seems a lot of cash to me for not a load of oomph... my induction kit, crp and zorst made a load of difference so i'd do them first!
Mark H Posted May 3, 2004 Posted May 3, 2004 Have to agree about doing the manifold last, difficult to tell the extra power increase it gives you, at least with the others you get more noise for your ££
spike Posted May 3, 2004 Author Posted May 3, 2004 cool, it's worth asking tho, you never know, if you never ask zorst will be on b4 the weeks out
Scott_Mac Posted May 3, 2004 Posted May 3, 2004 Excellent... i'm at Horizon on Thursday if we bump into I asked a few folk about the manifold and they said the hassle is fitting it.... gives a bit of midrange, and some noise.... i may get it done, but probably last!
Recommended Posts
Archived
This topic is now archived and is closed to further replies.