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Looking for a K26/8 anyone have one spare?

DivineE

DivineE

New member
As the title really I'm putting my car back together standard but don't want to put the 220model turbo on it if I can help it. If anyone still has the original turbo from their 250 model laying around I'd like buy it off them. Good condition is preferable but I could have it re-built locally so not essential.

If that turns out to be a wild goose chase can anyone think why I couldn't put an after market turbo on with a regular Promax chip and just adjust the boost down progressively until the fuelling of the chip for the wide open throttle is safe? I don't want to pay for a days mapping on a car I will be fiddling with/ changing constantly and I don't want to pay £1500-2k for a maf and piggyback unit until the car has been happily running on the road for a few months finished.

Regards,

Ben
 
Once on boost there shouldn't be an issue but the spool up characteristics will be different. I'm not sure if this would cause an issue but I've read that at WOT the 944's DME fuels based on RPM rather than the AFM signal, maybe this isn't quite the case with turbos though. If the DME is expecting a certain spool up characteristic at WOT this could cause a fuelling error. However if it can look at the AFM as well or at some kind of load indication it may compensate on its own.

The fact that you spool up differently in different gears, my turbo spools by 3k in 1st and 2.5k in 5th, supports the fact that it can compensate for different spool up characteristics as the DME has no idea what gear you are in.

Also consider the scenario when say at 4k off boost at partial throttle then going to WOT. Again there is a spool up delay so if the DME assumes you are at full boost as soon as it sees a WOT signal you would go massively rich until the turbo spools.

Perhaps the DME looks at the AFM and the RPM's as well as TPS before it decides to switch to WOT maps.
 
I don't think its a problem in the first instance i.e. just driving around but looking at the lean spike in the very fast spooling 3.0 cars you'd have to say it looks like it does switch to a WOT map immediately. So that may be a problem. Good point. Thanks
 
Ben,try porsch a part, also Jon Mitchell and Promax as they may have one sitting about after modding a customers car.
Max at Frazerpart ?
 
Ben - we have several old turbo units here in the stores - you are welcome to find what you want amongst those if you pop in.

Baz
 
Thanks Barry I'm continually amazed by what you have hiding away in those stores. I thought a late turbo would be hard to come by these days.
 
Ben I am not sure we have one but there are lots of turbos there and you are welcome to look.

Baz
 
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