what did you do to your 944 today
- Thread starter colin944
- Start date
TTM
Active member
Eldavo said:
Ah yes, bigger brakes are clearly needed.
That sounds like quite a peaky delivery and narrow power band, are you sure you got the cam timing correct?
Peak torque should be around 4k-4.5k rpm with standard cams regardless of forced induction.
I am sure your top end is held back by the standard-ish intercooler, but a great peak figure still.
TTM said:
It is quite peaky and laggy at the moment, good shout on the cam timing and I’ll admit that I didn’t set those up (or double check them) so that may something I need to look into as well. Never saw MATs more than 10-14 degrees over ambient so the end-tank mod intercooler can‘t be that bad!
TTM
Active member
Since you mention lag I would think that your turbo is large to the point that the std intercooler is too restrictive to let the compressor reach its peak efficiency area and flow anywhere near as much as it can, probably a reason why inlet temp is still "reasonable". Things should change already if you advance cam timing until the sweet spot - you may have to try different adjustments until you can find it, but you can always try the most advanced position as a start, though keep an eye or rather en ear on knock as advancing the IVC event will lower the knock threshold and you may need to adjust your ignition curve depending on how earlier boost builds. By then the restrictive nature of the standard intercooler will be the elephant in the room.
scam75
Well-known member
dlknight said:scam75 said:
I thought there were two pumps, much easier to get to if you have the bumper off
But yes, otherwise a royal PITA
Well it's definitely leaking out when stationary a quick check today has confirmed. Get it up on my mates ramp when he can fit me in, 5L container of water in the rear footwell will keep me right for the time being. I think there are definitely 2 pumps, my mate reckons the headlamp washers are the usual culprit. I'll report back.
Stuart
TTM said:
That’s a really interesting point Thom - I didn’t really know much about the 16v cam timing until reading up and watching some videos after your comment. I spoke to Simon who built the engine and he told me that the cams weren’t setup when installed so I’ll start with max advance and move the ignition advance table across to the left too, I can then put it in the right place once I’ve got the results from the logs. Won’t be for a while yet as swapping the brakes over, repairing the ABS pump, dropping the fans to swap them out, etc. too
TTM
Active member
Getting the cam timing right is essential to get the engine to run correctly. When the cams are adjusted well then the engine should run and feel well at any load, regardless of boost. The turbo really is just there to support how much a top end can flow under boost but it really is the cams that dictate power delivery and the shape of the torque curve and how the engine responds dynamically.
The 16V cam pulley does not allow for much adjustment but should be enough if the compression ratio chosen was not too high or too low. The knock threshold will lower and exhaust gas temperature will increase when advancing IVC - it all makes sense as advancing IVC increases the dynamic compression ratio and causes a bump in low down torque at the cost of top end breathing.
I would suggest to trust how you feel from the driver's seat and engine response at least as much as what you can deduce from analysing the logs.
That you reach peak torque at such a high rpm suggests to me the cams may be not even just about half way on the adjustment range but nearer full retard. If that is the case then the engine must feel quite sluggish off boost... but then I am probably thinking too much here as the std intercooler must mess it all up anyway. You may not need to lower the ign advance "too much" when advancing the cams to full advance, but take it very easy on the first drive and just remove a few degrees in the areas where you hear knock when applying half load. Starting nearly from scratch by chopping down between 5 and 10° right away will be a chore.
The 16V cam pulley does not allow for much adjustment but should be enough if the compression ratio chosen was not too high or too low. The knock threshold will lower and exhaust gas temperature will increase when advancing IVC - it all makes sense as advancing IVC increases the dynamic compression ratio and causes a bump in low down torque at the cost of top end breathing.
I would suggest to trust how you feel from the driver's seat and engine response at least as much as what you can deduce from analysing the logs.
That you reach peak torque at such a high rpm suggests to me the cams may be not even just about half way on the adjustment range but nearer full retard. If that is the case then the engine must feel quite sluggish off boost... but then I am probably thinking too much here as the std intercooler must mess it all up anyway. You may not need to lower the ign advance "too much" when advancing the cams to full advance, but take it very easy on the first drive and just remove a few degrees in the areas where you hear knock when applying half load. Starting nearly from scratch by chopping down between 5 and 10° right away will be a chore.
Kongsodoken
Member
Well getting on nicely - who said you can’t fit early wheels on a late car 
Kongsodoken
Member
Not rolled - extended by 28mm
Oh My!
I was reading your sig update and thinking - does WB stand for WideBody?
Can‘t wait to see it - I was offered a Broadfoot Kit (only about an hour from me) when I was having all my bodywork done but it was just at the wrong time otherwise I’d have gone down that route.
I was reading your sig update and thinking - does WB stand for WideBody?
Can‘t wait to see it - I was offered a Broadfoot Kit (only about an hour from me) when I was having all my bodywork done but it was just at the wrong time otherwise I’d have gone down that route.
Kongsodoken
Member
Eldavo said:
This is a lot more subtle than the fibreglass ones only 28mm either side - and NO cost as Im painting it anyway
you have to look twice to notice it but it does look more muscular.
Ive wanted to do this for years but not had the guts to take an angle grinder to the car - I’ve never done bodywork before but in my early career as was a car body designer BIW so I have a good eye and an understanding.
taught Myself welding and went for it so far I’m very happy with the results
Dan944t
New member
oh wow !!!
please post more pics of this as it goes along ,.. i can’t wait to see this
i would love to do the same one day , always thought if the rear and front flares were slightly wider , the 944 would look so much more aggressive ..
i can’t say i like the wide body’s they use in america for racing these with the open backs [:'(]
this is gonna be amaizing ,.. i’m really interested to see side on photos f how your going about the cuts ect
really well done for giving this a go
Dan
please post more pics of this as it goes along ,.. i can’t wait to see this
i would love to do the same one day , always thought if the rear and front flares were slightly wider , the 944 would look so much more aggressive ..
i can’t say i like the wide body’s they use in america for racing these with the open backs [:'(]
this is gonna be amaizing ,.. i’m really interested to see side on photos f how your going about the cuts ect
really well done for giving this a go
Dan
Kongsodoken
Member
I think this shows the cuts bestDan944t said:
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