Discussion
Try www.porsch-apart.co.uk , I bought a Stainless back box from Simon a couple of years ago, it's only a copy of the std back box so no performance gains are claimed but it sounds a bit louder. Only cost £220 and it's still nice and shiny even now.
Andy
Andy
Have you considered a decat pipe as well? That's supposed to release a bit of power. Is it the ProMax chip you're looking at? I think decat + K&N filter + chip are quoted to give upto 250+BHP 
www.promax.uku.co.uk/promax944kit1.htm
www.promax.uku.co.uk/promax944kit1.htm
another thought occurred to me about the claims that a decat pipe together with rechip and air filter kit will achieve 250 bhp on an s2. my s2 hasnt got a cat but all row s2's are rated at the same 211 bhp with or without cats the usa versions which presumably all have cats are rated a bit lower at approx 208 bhp so if this claim is correct dosnt it mean that uk s2's with cats have less power as standard than s2's without cats and why cant i have 247 bhp on my s2 with a kit
why cant these claims be substantiated by before and after tests on a rolling road and what are the chances of that happening
why cant these claims be substantiated by before and after tests on a rolling road and what are the chances of that happening
The 250bhp claim comes from one of the figures gained on a rolling road day that I organised this year for the 944 Register and 944 Titanic email list. Take a look at this spreadsheet and look for Andrew Mais car:
www.cannell.co.uk/Dyno%20Day%20190604.htm
You should always take rolling road results with a pinch of salt as they provide a caculated figure from the rear wheel horsepower that is measured. I have always been a bit doubtful of Andrews result compared with the other cars on the day, but you will see from his chart that he seems to have a higher rev limit and his power is made at 6700rpm. His car uses the Blitz chip which is now sold by Promax.
Another chap on that spreadsheet (Darren) did do a before and after run removing a Superchip and installing a Blitzchip which you can see on his graph.
My own totally standard s2 with over 150,000 miles was measured the previous week at 207bhp, and we did have a brand new Boxster S on the day that measured at 248bhp so on the whole I think the rolling road was reasonably accurate.
www.cannell.co.uk/Dyno%20Day%20190604.htm
You should always take rolling road results with a pinch of salt as they provide a caculated figure from the rear wheel horsepower that is measured. I have always been a bit doubtful of Andrews result compared with the other cars on the day, but you will see from his chart that he seems to have a higher rev limit and his power is made at 6700rpm. His car uses the Blitz chip which is now sold by Promax.
Another chap on that spreadsheet (Darren) did do a before and after run removing a Superchip and installing a Blitzchip which you can see on his graph.
My own totally standard s2 with over 150,000 miles was measured the previous week at 207bhp, and we did have a brand new Boxster S on the day that measured at 248bhp so on the whole I think the rolling road was reasonably accurate.
had a look at dyno results and the andy mais 252bhp s2 has a ss backbox and a custom induction set up and a blitz chip which you explain is the promax chip
so is the ss backbox the same as a decat kit
and is the custom induction set up a K&N panel filter
and is everything else standard
the promax dyno results list an andrew mais s2 as having an ESS exhaust a cone kit induction set up and the promax chip to give 250bhp
is the exhaust the complete janspeed developed system which includes the decat section and the cone induction set up the same as a K&N panel filter replacement and is everything else standard
i really dont know what the answer is but i really support you blokes for trying to develop performance
stuff for the s2 but a comparison has got to be "like for like" or it poses more questions than it answers
or perhaps im a cynical old git
so is the ss backbox the same as a decat kit
and is the custom induction set up a K&N panel filter
and is everything else standard
the promax dyno results list an andrew mais s2 as having an ESS exhaust a cone kit induction set up and the promax chip to give 250bhp
is the exhaust the complete janspeed developed system which includes the decat section and the cone induction set up the same as a K&N panel filter replacement and is everything else standard
i really dont know what the answer is but i really support you blokes for trying to develop performance
stuff for the s2 but a comparison has got to be "like for like" or it poses more questions than it answers
or perhaps im a cynical old git
So as mines a 1989 model than there's no point in getting the whole system as there should be no CAT on my car?
Not sure about the free flow filter???
F 100 HWE Darren S2 STD 91 N/A STD Blitz N/A 236 6125 206 5658 199 174
J 943 HGF Fen Coull S2 89 N/A K&N Panel Blitz N/A 227 6176 206 4760 188 172
From these figures it would appear that the better power is produced by the Standard filter (F100HWE......mind you this one seemed pretty healthy B4 chipping???), although torque seems to be the same, with the K&N it seems to come in lower in the rev range???
Could this be something to do with the exhaust system? J943HGF has no info about Exhaust?
Do you think it's worth changing the filter if i'm chipping it & replacing the Backbox with larger Dia unit??
Not sure about the free flow filter???
F 100 HWE Darren S2 STD 91 N/A STD Blitz N/A 236 6125 206 5658 199 174
J 943 HGF Fen Coull S2 89 N/A K&N Panel Blitz N/A 227 6176 206 4760 188 172
From these figures it would appear that the better power is produced by the Standard filter (F100HWE......mind you this one seemed pretty healthy B4 chipping???), although torque seems to be the same, with the K&N it seems to come in lower in the rev range???
Could this be something to do with the exhaust system? J943HGF has no info about Exhaust?
Do you think it's worth changing the filter if i'm chipping it & replacing the Backbox with larger Dia unit??
I think Andrew Mais car has the Essential Styling rear box, a decat pipe and their stainless steel air filter. I've emailed him to make sure. His is the car featured in a 10 page spread in the April '04 issue of 911 & Porsche World.
Darrens before figures look healthy because he has a Superchips chip in his car originally. He changed it for a Blitz chip on the day and did a second run.
For those who know their S2 history
there was a final run of 15 S2 that were badged as S2 SE by Porsche Reading back in 1992. They were uprated to 225 bhp simply by Reading using a Superchip. This info came from Steve Kevlin of PCGB who worked for Porsche at the time
Darrens before figures look healthy because he has a Superchips chip in his car originally. He changed it for a Blitz chip on the day and did a second run.
For those who know their S2 history
there was a final run of 15 S2 that were badged as S2 SE by Porsche Reading back in 1992. They were uprated to 225 bhp simply by Reading using a Superchip. This info came from Steve Kevlin of PCGB who worked for Porsche at the timei think the F100 HWE comparison was said to be a superchip versus blitz chip to give the healthy output for the 'std' chip and the higher revs
it certainly looks like the blitz chip is producing the higher output what is it like thro the range though it may only mirror the standard curve filling in any 'emmission' mapping and make the extra bhp by extending the upper limit which is ok if you do track days
i think the filter is probably best left as standard
you have a difficult choice with the exhaust as the ESS system costs a lot but it is a quality product
i like my standard noncat s2's power/torque characteristics and driveability its rare that i need more than 3000 rpm on the road.
it certainly looks like the blitz chip is producing the higher output what is it like thro the range though it may only mirror the standard curve filling in any 'emmission' mapping and make the extra bhp by extending the upper limit which is ok if you do track days
i think the filter is probably best left as standard
you have a difficult choice with the exhaust as the ESS system costs a lot but it is a quality product
i like my standard noncat s2's power/torque characteristics and driveability its rare that i need more than 3000 rpm on the road.
If your still in the market for an exhaust, check this out on E-bay:-
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=10408&item=4507089228&rd=1
Andy
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=10408&item=4507089228&rd=1
Andy
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