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S2 feels a bit flat below 4k

nick9one1

nick9one1

New member
I've been wondering if my S2 isn't ruining quite right.
Since I've had her she's always been a bit flat below 4k, but speed quickly builds 4k onwards.
Just wondering if this was normal and if not is there anything obvious that it could be?

Ive recently replaced the DME coolant temp sensor, spark plugs - which all looked healthy (brown/grey dusty), serviced the AFM so that the arm runs on a fresh part of resistor track, and removed/cleaned the ICV.

My hunting/rough idle seems to have gone, but she still seems to lack a bit of punch.
Any other suggestions to what it could be (if anything)?




 
Do you have experience of another S2 to compare yours with? If not, since you say yours has always been like this while in your hands, that's the first thing I'd arrange, trying someone else's car, or putting yours on a dyno, otherwise it's hard to know what it should be like. If you also drive something like a modern diesel then almost any normally aspirated four-cylinder petrol engine will feel a bit flat in the mid-range.
 
Long time since I owned a 944S2, the description is more like a 944 Turbo! (ducking for cover).

The 944S" had a lot more push in the bottom end so you have a problem, suggest as per low timer that you post where in the country you are as a fellow forum member will probably volunteer to give you a comparison with there car.
 
I'm guessing mine is chipped, as it doesn't have a noticeable "peak" in the power. I've not driven an unchipped S2, I think most people have gone for the Promax chip at some time as it seems to have most effect in an S2.
 
thanks for the replys..

I've never driven another S2, so my judgement is purely based on what I 'believe' the car should feel like. It would be great there was another S2 near me! - I'm in Grimsby, North East Lincolnshire!

Its possible the cams are a tooth out - the last belt change in '09 was done by the owner. So very possible a mistake was made.
I was plannig to change the belts after winter. If I do wait till then, and if the cams are a tooth out will I cause any damage by driving it?

 
Prior to fitting a Promax chip in my S2 there was no real lag in power below 4k but would definitely pick up around 3/4K and fly, the chip seems to have made the delivery smoother below 3K so feeling flat below 4K may be due to the way the car is set up standard to meet emission regulations, which I think are measured around 3-4K. Other things to check are usual stuff like plugs. leads and distributor cap.
 
I do plan to replace the cap/arm soon, so I will see if that makes a difference. Plugs have been replaced, and Im pretty sure the leads are OK as it doesnt misfire or run rough.

One other possible symptom I've noticed is when idling it does seem to 'hunt' slightly. The needle seems to swing though a 50-100rpm range. Although I need to double check as I did remove the ICV and give it an overhaul this weekend - so possible it no longer does.


 
had mine dynoed sunday results were 191bhp 194ft-lb guy who did the run said it was very ood as i thought the same as you a bit flat till 4.000 rpm he said it was fine
 
ORIGINAL: jay944

had mine dynoed sunday results were 191bhp 194ft-lb guy who did the run said it was very ood as i thought the same as you a bit flat till 4.000 rpm he said it was fine
Click to expand...

I presume it was 191bhp at the wheels? So with a 20% loss that equates to 228 BHP at the flywheel? Seems high! is it chipped?or is it a turbo?
 
I would assume its at the flywheel, mine was 191 when first dyno'd, then 201 after promax chip and k&n filter, not much top end but about 20% extra torque at 3500rpm (100ftlb to 120ftlb), which is enough to be noticable.

~Edd
 
i wood think it was at fly wheel cars standed as far as i know promax chip was my next job and kn panal filter
 

ORIGINAL: 333pg333
(Sorry, no offence. Just a prod back at Olly. [:D])
Click to expand...
Bu99er off. I've got a cold and the weather is nasty and I haven't driven my car for weeks and the cat has just scratched me and the FTSE is down (again) and my idea for a new business isn't going very well and my feet are cold (not helped by holes in the socks, but they are my favourite socks, bought on the same say as I bought my S2 - all those years ago) and I've just been to the supermarket and had to stand in the effing queue for effing hours and I'm trying to make KDE work on my computer and it won't and I'm not in a very good temper.

Buy a toyota corolla. I'm told they are nice and reliable.

(If this post comes across as being slightly bad-tempered it's because it is. But here's a smiley so as not to cause offence [:mad:])


Oli.
 
ORIGINAL: zcacogp

Bu99er off. I've got a cold and the weather is nasty and I haven't driven my car for weeks and the cat has just scratched me and the FTSE is down (again) and my idea for a new business isn't going very well and my feet are cold (not helped by holes in the socks, but they are my favourite socks, bought on the same say as I bought my S2 - all those years ago) and I've just been to the supermarket and had to stand in the effing queue for effing hours and I'm trying to make KDE work on my computer and it won't and I'm not in a very good temper.

Buy a toyota corolla. I'm told they are nice and reliable.

(If this post comes across as being slightly bad-tempered it's because it is. But here's a smiley so as not to cause offence [:mad:])


Oli.
Click to expand...

Group hug for Oli! [:eek:]
 
Ah - you're all heart McNulters! I didn't really mean it when I was (last) rude about the mods on here - you're OK really!

:)


Oli.
 
Sounds like cam timing, should feel very linear. ISTR the Promax chip just removes the small hole in the mid range that the stock chip leaves which ISTR is at the point where the engine runs very lean, something like 3K from memory.

BTW the supposed high torque output of the S2 is over-rated IMHO as really its a relatively low revving engine, in other words its more low power than high torque in modern terms. On track you need to rag the nuts of the thing in every gear to make rapid progress.

Something else I think many ppl don't realise, if one looks at the maximum power comparing the S2 to 968 motor than its only about 30 Bhp. However if one looks at the point in the power curve where you drop to on the gear changes the difference can be as much as 50 Bhp, as the 968 has a much stronger mid range. In these terms the S2 engine doesn't sound so impressive.
 
Neil,

Interesting points. The Promax chip improves the torque across the rev range, making it feel like a beefier engine. The peak power is not affected much, but the mid-range pretty much everywhere is helped significantly. In so doing it does remove the step at around 4krpm (corresponding to around 90mph in 5th), making the car an easier motorway machine in the process.

I'm interested in what you say about the superiority of the 968 lump over the S2. If this is the case, why does the 968 only do marginally (if at all) better than the S2 in the various performance figures?


Oli.
 

ORIGINAL: zcacogp

I'm interested in what you say about the superiority of the 968 lump over the S2. If this is the case, why does the 968 only do marginally (if at all) better than the S2 in the various performance figures?
Click to expand...

I believe mainly because it's over 100kg heavier than an S2 (apart from the 'lightweight' Clubsport, which is only 15kg heavier)
 
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