944 Turbo powerband
10-19-2007, 03:51 AM
#1
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944 Turbo powerband
I've been thinking about buying one, but I'm curious as to how the power is delivered. At what RPM does boost start to come on? Is the delivery different on the S model? How about with a typical performance street turbo upgrade? Does a ball bearing turbo make a difference? How is the delivery of a 340 RWHP kit? Is there a way to get boost to come on sooner?
10-19-2007, 04:08 AM
#2
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You just asked a book full of questions. I'm not sure on what kind of detail you're looking for. Your best bet is to search in the Turbo/Turbo S forum and read read read. There is a ton of info and you'll be able to find what you need. Good luck.
10-19-2007, 12:15 PM
#3
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There was a thread on this recently in the Turbo/TurboS forum: https://rennlist.com/forums/944-turbo-and-turbo-s-forum/383871-turbo-comparison-boost-curve.html. I posted a boost curve there for my K26/8 with MAF. I see boost start to develop in the low 2000 rpm range. Around 3000-3500 rpm you are in full boost, at least in 4th gear. Boost ramp-up is a bit slower in the lower gears. The K26/6 spools up a little bit sooner than the K26/8.
10-19-2007, 01:03 PM
#4
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Ok
stock 944 Turbo S
0-1000 RPM (idle range)
1000-2000 rpm (crawl range. No hp at all and don't dare stand on it. Lugging = bad)
2000-3000 rpm (walk range. car will cruse all day here, but never feel very powerfull. If you step on hard not much will happen)
3000-4000 rpm (fun starts. power comes in bunches and the rate of change of accleration can snap your neck back. stats with some lag then boost comes in as RPM's increase)
4000-rpm to red line ( Full power range. The is really fast in this range and responds very quckly. little if any lag).
stock 944 Turbo S
0-1000 RPM (idle range)
1000-2000 rpm (crawl range. No hp at all and don't dare stand on it. Lugging = bad)
2000-3000 rpm (walk range. car will cruse all day here, but never feel very powerfull. If you step on hard not much will happen)
3000-4000 rpm (fun starts. power comes in bunches and the rate of change of accleration can snap your neck back. stats with some lag then boost comes in as RPM's increase)
4000-rpm to red line ( Full power range. The is really fast in this range and responds very quckly. little if any lag).
10-19-2007, 05:41 PM
#7
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with all those questions you just open a can of worms. You best bet is search on the turbo and turbo s forum then ask specific questions. I know how is i was once there too. So i am more than willing to answer any questions you have. And just start paying to the vocab that goes on like CV means cycling valve it also has other meanings too but most of time that is what people refer it to. Spool characteristics depends on the mods that you have. Different combination yields different spool time. and blah blah. Most important question of all is what kind of budget can you spend on your car. and the next big question is are YOU going to be doing the work?
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10-20-2007, 08:07 AM
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I realize that this is 20 year old technology, with some improvements made by the aftermarket, but I'd like to know how much improvement has been made?
10-20-2007, 08:57 AM
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There was a thread on this recently in the Turbo/TurboS forum: https://rennlist.com/forums/showthread.php?t=383871. I posted a boost curve there for my K26/8 with MAF. I see boost start to develop in the low 2000 rpm range. Around 3000-3500 rpm you are in full boost, at least in 4th gear. Boost ramp-up is a bit slower in the lower gears. The K26/6 spools up a little bit sooner than the K26/8.
10-20-2007, 09:09 AM
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with all those questions you just open a can of worms. You best bet is search on the turbo and turbo s forum then ask specific questions. I know how is i was once there too. So i am more than willing to answer any questions you have. And just start paying to the vocab that goes on like CV means cycling valve it also has other meanings too but most of time that is what people refer it to. Spool characteristics depends on the mods that you have. Different combination yields different spool time. and blah blah. Most important question of all is what kind of budget can you spend on your car. and the next big question is are YOU going to be doing the work?
10-20-2007, 10:21 AM
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Without actually getting a ride in one (the best thing to do), I think that Joe's post in #4 is the best description of how a stock turbo s will feel. There are a lot of people who did minimal mods to a car and got great results. One person who did all the work himself, did some mods in stages, and then progressed to even more mods is 'Special Tool'. He really has pushed the envelope (has a good deal of mods now) of the 2.5L turbo. Do a search on him, or, venture over to the turbo board and make a post there. You will definately get a lot of responses, but, everyone will ask you the same questions again. What is your budget (apprx), usage for the car, and estimated BHP you seek.
10-20-2007, 01:07 PM
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S2,
The S's and (I have a well put together and low milage one) IMHO are a pain to drive in traffic. There is essentially nothing down low, 2200 and less. This combined with the S's tall gearing further exacerbate the problem. So you drive around at 45 mph in 3 gear for an hour or two and add 1/3 of a quart of oil. This car is really not happy under 80 mph as at this speed and above the ground effects begin to honker the car down on its suspension and things begin to feel right. If you build a high RWHP car it is a gernade waiting to happen and you will get destroyed ( turbo lag ) by a Vespa out of the corners on the street. I do however know of some well built higher hp 951's having involved complete engine rebuilds, dry sump, larger machined intake manifold ect. but they have $50,000 of work in the car. I would first look at the suspension. Then do an exhaust, full 3"; 15 pounds of boost and get it to a mustang dyno with a good tuner. Also take a look at the club racing times of F and E between cars and this will prove my point my point about the effects of turbo lag. Good luck
The S's and (I have a well put together and low milage one) IMHO are a pain to drive in traffic. There is essentially nothing down low, 2200 and less. This combined with the S's tall gearing further exacerbate the problem. So you drive around at 45 mph in 3 gear for an hour or two and add 1/3 of a quart of oil. This car is really not happy under 80 mph as at this speed and above the ground effects begin to honker the car down on its suspension and things begin to feel right. If you build a high RWHP car it is a gernade waiting to happen and you will get destroyed ( turbo lag ) by a Vespa out of the corners on the street. I do however know of some well built higher hp 951's having involved complete engine rebuilds, dry sump, larger machined intake manifold ect. but they have $50,000 of work in the car. I would first look at the suspension. Then do an exhaust, full 3"; 15 pounds of boost and get it to a mustang dyno with a good tuner. Also take a look at the club racing times of F and E between cars and this will prove my point my point about the effects of turbo lag. Good luck