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Got Boost?
 
Join Date: Jan 2007
Location: NH
Posts: 135
protomotive turbo system

my friend is selling a system on ebay
if you do a search for porsche and protomotive you will see it
the system is complete and would be great for someone doing a turbo conversion to a 3.2 motor or for someone with a 3.3 turbo who wants EFI
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john bradshaw
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porsche 930rs
SPA #227
Old 02-26-2007, 07:08 AM
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Got Boost?
 
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he just relisted the system
this time it is going no reserve
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Old 03-03-2007, 07:37 AM
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Hi, I just found the system on Ebay. I dispatched an email to the seller but if you could give me more info on it that would be great.

I'm new to turbocharging Porsches but not new to turbocharging. That being said I would like to know the specifics about the turbocharger and wastegate. What size is the compressor wheel? What A/R is the exhaust housing? What size is the wastegate? It appears to be an HKS wastegate, but I'm not 100% positive. Can you clarify this detail?

The motor this would be going toward is a 3.2 from the late 80s. Will these parts bolt directly up? How difficult do you think it would be to install this setup? I've developed competency with wrenches as I have a turbocharged vehicle of my own which has had two sets of turbos bail.

Will any other modifcations be necessary? Fuel for instance? I guess I should give more detail about the 911 it's going into. It is a 3.2L and is 100% bone stock. The transmission is a 915, will this be able to survive under the stresses of turbocharging? I assume a new clutch will be needed to survive at the new power level, can you make any recommendations?

Please excuse my ignorance, like I said I'm new to the world of Porsche turbocharging and wanted to know exactly what I would be getting into before I took the leap. Thanks in advance.
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Old 03-03-2007, 04:43 PM
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Your 915 does not have a prayer of holding this kind of power, not even within 150 horsepower of this kit!

You would need a new tranny, not a new clutch, I believe.

The intercooler requires a large tea tray rear spoiler, a '78 or newer turbo spoiler. It won't fit in a carrera rear spoiler.

Last edited by DDDD; 03-03-2007 at 06:37 PM..
Old 03-03-2007, 06:01 PM
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Thanks for the heads up on the tranny. I suppose that's one more thing I should start looking for.

I also received a reply from the seller, he recommended I swap out for 3.3L pistons and cylinders.
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Old 03-03-2007, 10:14 PM
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I bought my 930 because my 3.2 carrera only has a 915 tranny and not a G50.
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Old 03-03-2007, 10:29 PM
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come on guys my 915 is still holding up along with raryl8's and many others its all in how you drive them
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Old 03-04-2007, 03:45 AM
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Before my 930 I had a euro sc that I blew up
Rebuilt that motor as a 3 liter intercooled turbo (turbo pistons and cylinders)
Butt dyno says that thing made about 300-350 hp
I ran a 915 with a heavy clutch and never had a problem
I have heard they will handle up to 400 hp
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Old 03-04-2007, 07:35 AM
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Quote:
Originally posted by jrottn
Before my 930 I had a euro sc that I blew up
Rebuilt that motor as a 3 liter intercooled turbo (turbo pistons and cylinders)
Butt dyno says that thing made about 300-350 hp
I ran a 915 with a heavy clutch and never had a problem
I have heard they will handle up to 400 hp
This package looks to be producing 500 hp at low boost, like .8 bar.
Old 03-04-2007, 08:23 AM
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like stated above, the 915's are better then their rep.

its torque that kills them, and not in the lower gears... its 5th that cannot handle bags of torque, so avoid a truly high speed run.

i know the side plate flexes too much in the lower gears, and that can make it hand grenade, however if you add the powerhaus2 side plate that issue should be solved.

you don't need a new tranny, just gotta make sure yours is up to the task. Chris Streit should be able to tell you how to strengthen your 915....and any comments he makes will be on the safe side.
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Old 03-04-2007, 09:21 AM
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But do we think it's really necessary to goto 3.3L cylinders and pistons as the seller advised to make this work well? If amount of boost is becoming a factor I've noticed that many bolt-on 3.2L kits run around 0.7 bar and last with the standard compression ratio and fuel system. Not to mention different wastegate springs, bleed valves, and smaller turbochargers are all important. I just want to make sure this system will be able to bolt up to my motor, I can deal boost control from there.

After some research I'm also realizing I probably won't have to touch the 915 internally, which is a big plus.

Turbocharging my 3.2 has been in my mind for quite some time, but when the prospect of owning a Supra twin turbo came along I jumped at the chance. On that note, I already purchased an entirely OEM turbo system from a late 70s turbo car. I could always fab that, but this system interested me.
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Old 03-04-2007, 10:51 AM
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One major questionmark is the fact that the EFI is tuned specifically for one exact engine set up by Protomotive. You need to replicate everything, down to the compression ratio and piston and boost pressure to achieve the same tuning.

Mess with any variables and you are not sure to get a similiar EFI response. The Bosch system is notoriously hard to program, and Protomotive is different than everybody else in that they use it. But whatever they set the kit to run at is exactly what you would want to run, I think.

I am not sure how much freedom you have to put random items on a prepackaged, specifically programmed Bosch EFI system. I am not at all sure what flexibility that the EFI offers.

It is like in the old days when people put better mufflers and headers and intakes on a standard EFI system only to discover that the EFI ran worse, not better.
Old 03-04-2007, 12:55 PM
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check out jbrinkley's turbo install on his 3.2 lots of good info
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Current project 73 914-6 Gt project rusteration 2.4

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Old 03-04-2007, 04:19 PM
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Ah yea I forgot about wonderful little thing called DME and how much fun it must be to burn chips for optimum use. I recall when I was first setting out to turbocharge my 911, I called Powerhaus Racing to find out my options. They must have figured a kid (this was about 6 years ago and I was a sophomore or junior in high school) calling to talk about turbocharging a Porsche 3.2L was just wasted time and told me it couldn't possibly done because the Motronic system couldn't sense changes in pressure. If only I had a little more knowledge and the balls to call them out.
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Old 03-04-2007, 05:21 PM
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The OEM DME *IS* dumb when it comes to boost pressure. It doesn't have a built in MAP sensor, so it's completely unaware of boost/load. It's only aware of air flow & inlet air temp (which it then uses to calculate air density) & throttle position (even then, it's just basic throttle position such as idle, open or WOT).

These kits work by using a rising rate regulator which is "boost sensitive" and the DME CHIP has the modified fuel & ignition map for forced induction configuration.
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Old 03-04-2007, 06:11 PM
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Yes, I understand this. I was just highlighting the fact that I was told it couldn't under any circumstances be done. Which is obviously incorrect.
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Old 03-04-2007, 07:23 PM
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You are right in that respect MANY of us have turbocharged our 3.2's with phenomenal success
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Old 03-05-2007, 11:51 AM
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