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DP935 engine what are they made of?
Hello folks,
I've bought sight unseen what I believe is a true DP935, the car is almost in "barn find" condition and currently in a container on its way to Europe. While waiting the container to arrive, I'm staring at the picture I get. One detail particularly get my attention: Red zone starts at 6800 where the original engine is supposed to cut and goes up to 8000rpm:  I guess the engine is the full DP "package":  From what I have found in various literature, those numbers were common for DP engine:    The related article quotes a max power of 428HP @6300 RPM for 1.25b boost... On another source (may not be actual DP red line as engine is EFI and said to push 600HP):  So back the the title and the main question... What those engines are made of? I was basically thinking that they were just cam and boost alteration but this red line at 8000 make me think that the bottom end may have been upgraded as well... |
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07-17-2016, 08:02 PM
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Join Date: Mar 2006
Location: MD/DC/VA
Posts: 5,872
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Always hard to say what you may have with these cars.
Engines details etc.. were a' la carte on these cars when new back in the 80's. They were spec'd to owners request. I previously owned a full DP widebody Euro Targa.. I was the 3rd owner and the car was actually and SC that DP built.. so no turbo motor and brakes etc.. Back to this car.. it does have the big DP intercooler, but the brochure doesn't say much about what else in the engine. It does state standard bore and crank, stock compression, etc.. Nothing about cams, headers, twin plug, or special valve springs etc.. to support those redline on those tachs. Not saying however, that this stuff isn't there.. a la carte. About that injection, brochure says CIS and DP was not doing EFI in the 80's through 90's if even now. That being said, it'll be interesting to see what you have there.. cant wait for you to tell us! Have fun!
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RGruppe #180 So many cars.. so little time!! |
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07-18-2016, 10:10 AM
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Location: Austin
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07-18-2016, 11:17 AM
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I contacted DP motorsport but now the company is run by the son Patrick and he said that there's no documentation about these past conversions.
I should try to contact the father, maybe he would remember what they were usually putting in their engines. I was basically thinking that it was just cam, boost and rev limiter set higher to let you play with the devil. I read somewhere that they also had some custom fuel head... It looks that these cars ad the reputation of being terrifying but reliability doesn't look to have been the concern at the time... Here are some additional specs I could find in a magazine: Does anybody know the Nerosit brand?  I'll be able to see the car end of August (I'm working overseas), I already bought a borescope to inspect all that. Until that I'm trying to investigate on the car the way I can... |
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07-18-2016, 03:31 PM
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Unless you have the original build sheet from DP who knows. Who ever added the efi probably did a few other things while they were in there. Is there any paper work that came along with the car?
Any more photos of the car? I sure do love that tach!
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Harold '79 930/DP935 (sold) '68 VW 3.3 Turbo Crewcab |
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07-18-2016, 04:17 PM
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I don't have any paper with the car, I'm waiting the shipping company to send me a copy of the title to put a name on the previous owner and try to contact him.
I don't have yet any good picture of the exterior I'll make a better presentation when the car arrives... It's a guards red US version with factory bumpers... To help you wait, here are some more details of the DP signature:   And something that also brings questions, turbo is a Garrett with a welded inlet: 
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07-19-2016, 03:25 PM
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Location: Jacksonville, FL
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Quote:
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07-19-2016, 07:04 PM
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Location: Los Angeles
Posts: 2,571
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Looks like a factory, 935 dial-a-death based on the lock nut and washer. I'd be a little concerned about the health of the motor, though, if the tattle tale boost gauge is accurate (and not just showing the spike).
Car is probably full of period goodies...I kinda dig it as long as it's a coupe. |
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07-19-2016, 07:55 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,142
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Baffling to have a 8000RPM rev limit at only 422chp? That number can now easily be made at 6000.
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07-19-2016, 08:10 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,142
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Quote:
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07-19-2016, 08:12 PM
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Exactly, previous owner made full use of DP spec to 1.25b...
Thus I'm a bit concerned about how's the engine inside? All I know is that it turns by hand... On one of the article they quote the max power at 6300 rpm And in the famous article "All bow down" the author says "at 5.500, you'd better have your prayer beads out, because there's no reach for them"... So looks that drive-ability was not really a concern at the time... |
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07-19-2016, 08:34 PM
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Quote:
 So ringed heads, makes sense with 1.25b boost... |
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07-19-2016, 08:45 PM
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Join Date: Aug 2014
Location: NY
Posts: 3,268
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Looks good! Post some photos when ya get her! hope you got a good deal considering all the unknowns...
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07-19-2016, 08:59 PM
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Good deal and anything 930 related is something of the past I'm afraid...
But I tried to limit the risk considering the global parts value. If at the time I wish to sell it the DP935 are not high on market, I'll just keep it and make a 930 group IV for rallying out of it... |
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07-20-2016, 12:16 AM
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07-20-2016, 06:11 AM
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Location: Costa Rica and Pennsylvania U.S.
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Dp cars
Hi,I can shed a little light on this subject as I visited the Dp factory in 1986.I had a customer with a Peru Red 76 930 who sent a concours 20,000 mile car to them.He flew me there to check them out and see the progress of his car.While there we had lunch with the owner and the Kremer Brothers at a Hofbrau house.Dp was actually a styling makeover.Any engine mods came from the Kremers.There was no in house engine service other than bolting on a big intercooler.When the car returned to my shop.I twin plugged & ported the heads & injector blocks to 38mm.98mm MAHLE P&C.Carrillo rods 1mm longer.K-27 Turbo & 3.2 Carrera exhaust heater boxes which are 38mmI.D.Boost was set at 1 Bar with Ni-resist rings.Car worked very well.The current owner is in Michigan and contacted me 10 years about the motor and its contents.He is an enthusiast and probably a member of the DP squad.Maybe a pelican member up knows him and he can add something.The car revved very quickly as to the light internals compared to a 3.3.Fred Apgar
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07-24-2016, 02:55 PM
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07-24-2016, 06:16 PM
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Thanks for all your input.
My engine is CIS, I believe in the state it left DP Motorsport workshop. I think I'll now contact Kremer to know if they can remember what they used to put in their engines. |
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07-25-2016, 05:51 AM
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Join Date: Feb 2008
Location: Bayside Wi
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[QUOTE=faapgar;9212374].Dp was actually a styling makeover.Any engine mods came from the Kremers.There was no in house engine service other than bolting on a big intercooler. (quote)
^^^^ I have heard similar stories. Here is the build sheet from a Kremer. It was furnished to an appraisal company for insurance coverage years ago. I recently contacted Kremer GMBH and sent a copy of this build sheet for additional details of the build for more info however I was told both Manfred and Irwin Kremer are no longer with them. As a result no further details are available. 
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Anthony @ Voitureltd Bayside WI. Last edited by voitureltd; 07-25-2016 at 06:59 AM.. |
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07-25-2016, 06:45 AM
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Wow 3.2 sec for 0-60mph! That is wicked fast in any book! That would have been fun to ride I. That car with Mr. Andretti.
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John- 78 Slick Top 930 "Illegitimi non carborundum" |
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07-25-2016, 08:34 AM
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Porsche 911
