[carnut169]

I wrote Protomotive to inquire about the turo kits they sell and Todd Knighton wote me back with the following information:


The Stage 1 and Stage 1 upgrade are the only two sytstems that are strictly 'bolt-on' for those cars...
The Stage 1 is a single turbo system that is non-intercooled due to the low boost pressure. It runs .5 bar or about 7psi on the stock compression ratio for anywhere from 335 to 375hp depending on the type of Stage 1 system you prefer... The lowest of them is the Stage 1 on the side, but it's also the cheapest. It basically takes place of the cat using exhaust pieces to connect from the factory heat exchangers to the turbo, then from the turbo to the stock muffler. It uses the drivers side lower valve cover for a drainback, and the intake plumbing comes up and around the back side for a nearly invisible turbosystem... I've even had people toy around and put the stock air cleaner box, cut out around the piping, back in position so you cannot tell that the engine is not stock from the engine bay
The 353hp Stage 1 is set up more like a 930, placing the turbo in the back, by the distributor and using a similar j-tube setup. It uses one of our mufflers, thus the power increase, but otherwise is quite similar. The plumbing runs diagonally across the engine to the afm, and with the large K&N air filter over the drivers side fuel rail, it's quite obvious that theres something going on there.
The 375hp Stage one runs all of the options. It uses equal length stainless steel headers, a 304S muffler and the turbo in the same position as the 353hp version. It's been clocked at 4.3sec 0-60 and a 12.9 sec 1/4 at 114mph in a 3300lb 87 Carrera. That particular car was quite heavy due to the roll cage installed. I've run this system quite easily to redline in top gear with usa gearing, or about 187mph.
The Stage 1 upgrade adds an intercooler, clutch package, and an upgraded a/c system to relocate the a/c condenser under the chassis. This allows up to .7 bar boost and about 425 hp based on the 375hp non-intercooled Stage 1. The other two sytems would be about 385/403hp with the upgrade applied.
All of the Stage 1' have exceptional boost response as they're based on the na engine using the stock compression ratio of 9.5/1 for usa models. The stock drivability is not only maintained, but quite improved as the added boost, even at light throttle, adds quite a bit of torque to what was already there.
Boost onset occurs at approximately 1800 rpm's with full boost coming in at around 25-2700 rpm's depending on the system. So, during normal driving conditions, boost is nearly always available instantly.
The Stage 1's feel more like a large displacement high powered engine when driving them as the high compression ratio and exceptional boost response would fool most people into thinking that the engine isn't even turbocharged.

Todd Knighton
Protomotive Inc.

P.S. On 1987-1988 models, Porsche had gone to Kohlbenschmidt for p/c's and they were cast and alusil. Very low quality. These engines are not recommmended for any upgrades due to reliability factors. Some of these cars did come with the Mahle's, like the 1984-1986 and 1989 models all did, and you can easily tell by jacking up the car and counting the number of fins on the cylinder... If it has 11 it's a mahle If it has 10 it's not


He is going to get back to me w/ prices... what do you guys think? What about the P.S info- 87-88 models having a weak engine??? I guess it is time to count fins!