Intercoolers
- Thread starter PhilKent
- Start date
PSH
PCGB Member
Having not put mine on a dyno yet I can't give you any comparison other than to say what Lindsey state which is an 18% increase in flow and 10-degree drop in the 'out' temp, this is for their Stage 1. I would expect it to be the same for all makes of stage 1 intercoolers as the changes are similar.
As I've said before it's very difficult, no, it's impossible for me to say which part did what on my latest round of mods due to there being so many changes. However, I can say that the type of effects that a stage 1 intercooler has on an engine are all felt on mine. That is a wider power band, quicker spool, faster response and of course, more power.
Back in the Titanic days Rick collated and published all of the details for his 944 UK league: found here http://www.cannell.co.uk/944%20UK%20League.htm
If you look through the charts you'll see those with standard, stage 1 and stage 2 intercoolers. My own car with a standard intercooler only did one run that day due to the tuner feeling a hesitation, (this was later identified as a broken iridium plug in number 2) so the readings are a little lower than expected, still made 368bhp but the torque was down from 382 to 353 on the previous run., Interestingly, this torque figure was still higher than Mark's top reading BHP car which recorded 401bhp. Also worth noting is that my car back then was set for 19PSI, others were using more boost. So yes an intercooler has an effect, especially when you are pushing the envelope which my engine now is but perhaps the most important part is the tune. Compare Fen's readings on the top line to mine near the bottom, Fen had a STG 2 intercooler but made less power in both BHP and Torque and that with 3 PSI more boost. I would put this down mainly to two things, who tuned the car and the management used. IMHO, I have the best in both sectors, Vitesse can't be beaten, yes it's now classed as 'old school' but John knows his trade supremely and the same goes for Wayne. Put those two together and you have a top-performing engine.
As I've said before it's very difficult, no, it's impossible for me to say which part did what on my latest round of mods due to there being so many changes. However, I can say that the type of effects that a stage 1 intercooler has on an engine are all felt on mine. That is a wider power band, quicker spool, faster response and of course, more power.
Back in the Titanic days Rick collated and published all of the details for his 944 UK league: found here http://www.cannell.co.uk/944%20UK%20League.htm
If you look through the charts you'll see those with standard, stage 1 and stage 2 intercoolers. My own car with a standard intercooler only did one run that day due to the tuner feeling a hesitation, (this was later identified as a broken iridium plug in number 2) so the readings are a little lower than expected, still made 368bhp but the torque was down from 382 to 353 on the previous run., Interestingly, this torque figure was still higher than Mark's top reading BHP car which recorded 401bhp. Also worth noting is that my car back then was set for 19PSI, others were using more boost. So yes an intercooler has an effect, especially when you are pushing the envelope which my engine now is but perhaps the most important part is the tune. Compare Fen's readings on the top line to mine near the bottom, Fen had a STG 2 intercooler but made less power in both BHP and Torque and that with 3 PSI more boost. I would put this down mainly to two things, who tuned the car and the management used. IMHO, I have the best in both sectors, Vitesse can't be beaten, yes it's now classed as 'old school' but John knows his trade supremely and the same goes for Wayne. Put those two together and you have a top-performing engine.
PSH
PCGB Member
The standard intercooler ia fine for the 968RS. .IIRC, it produced similar power to mine in 2007....it's when you want to break the 400bhp mark reliably that you need a more efficient intercooler...As the details in Rick's charts show, my car matched or bettered those who were not only using modified intercoolers but larger turbo's and higher boost levels too. It's the management and tune that is important but if you want a well tuned 951 over 400 bhp you need to go the extra mile. IMHO of course
To answer your question regards the mods. I've not done any further temp analysis, but wouldn't expect to see a difference as it was reading good temps against ambient anyway, but may, if I could tell, improve the response time for cooling. My aim was to increase flow more than anything and this I hoped would be shown in increased power on the dyno. TBH I've not seen any improvement on that front, but I've had other issues plaguing my dyno runs, so I'm actually a few BhP down on my last run with the old intercooler. This I am sure is due to inlet manifold leaks and exhaust manifold leaks too. Since I've cured them the car feels like it did before, but I've not dyno'd it to see what it's doing. I don't have a massive turbo though, so not shooting for crazy horses 
PSH
PCGB Member
Hi Phil
Regarding AT vs IT temps, you can see my temps from 2007 in my last post on my build thread...IIRC AT 19 and IT 18, this is with the mods for the recorded 368bhp. I have just checked the dyno run for when she recorded 280bhp in 2005. Temps then were AT 14 and IT 15...perhaps the standard intercooler is more efficient with a larger turbo fitted? IMHO the standard intercooler can handle some fairly large increases of power and thus heat, as has been prooved on a dyno by a number of modified 951's
Regarding AT vs IT temps, you can see my temps from 2007 in my last post on my build thread...IIRC AT 19 and IT 18, this is with the mods for the recorded 368bhp. I have just checked the dyno run for when she recorded 280bhp in 2005. Temps then were AT 14 and IT 15...perhaps the standard intercooler is more efficient with a larger turbo fitted? IMHO the standard intercooler can handle some fairly large increases of power and thus heat, as has been prooved on a dyno by a number of modified 951's
I believe 968Turbo and its homologation special siblings were not maxed out but were destined for a series that had an upper power limit - that was also why they used the 8 valve head not the 16valve - well that and cost - engineering the 16 valve head to work would have cost more than putting the 944 turbo head on.
Tony
Tony
Oh and I have a lindsey stage 2 intercooler on my car - mainly because I got at it a good price from Fen - I think from memory my car produced less power with it on - cant really blame the IC though it had other issues by the time it was dynoed with it - car was rather smoky up at Chester - though I think it was still the most powerful 944 on the day,
Tony
Tony
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