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Join Date: Jan 2007
Location: Atlanta
Posts: 305
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640 WHP 7 litre 928!
I just dynoed my car and here are the results.
640 HP @ 7000-7500, 501 ft/lbs torque. I'm happy as a clam!  Thanks to Louie Ott and Todd Tremel for the inspiration to make this happen! The engine is a docile 10.5:1 that runs on pump gas. It's a lamb. The driveability is nice, no ill manners or issues, just gobs of power. The individual throttles really tame it by preventing reversion. The day included 20 something dyno runs to tune the Motec ECU. After this one I installed restrictors on the airbox to knock a couple of hundred HP off so it can fit into NASA's GTS5 class which is based on power as measured on a Dynojet divided by race weight. It's a good thing that I don't have to drive it unrestricted, it would have run out of gas, 12 gallons is too small, what was I thinking? Next weekend is the next race at Road Atlanta... 
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Mike S. 79 928 Racer 427ci 32v 640WHP |
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07-30-2009, 12:47 PM
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Location: florida
Posts: 487
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Need more info ,,Boosted ,NA PSI,stock,ect,ect,ect?
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The beast 1984 928s twin turbo 5speed LSD/ 508.6RWHP 495RW ft lbs 12.5 psig manifold pressure, MS2 and EDIS-8 nikasil block JE 2618 pistons (TripleT). 2001 AUDI A6 4.2 chip 320 hp. 2002 CHEV Tahoe 4wd. 1971 sonett race car GT4 National Champion now GTL class car sold. The words of a Ford GT man. ( Damit i need to get some turbos) |
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07-30-2009, 01:13 PM
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Location: Atlanta
Posts: 305
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Quote:
It's NA. 7 litre displacement. 109mm bore, steel sleeves, nikasiled for no good reason other than I got carried away. Custom forged pistons for 10.5:1 compression. 94mm custom Moldex crank, LS7 titanium rods. Held together with my own high quality main and head studs. Block halves are 'shuffle pinned'. Dry sumped. ATI damper, my own lightweight flywheel for 7.25 dual disc racing clutches, hydraulic throwout bearing. Heads are CNC ported by me with 40mm intake valves and stock 33mm exhaust. The individual throttles are my design an built just for this engine. My own custom billet cams with 12.7 lift intake and exhaust. Motec ECU Sequentially fired injectors and sequential Bosch COPs ignited by seperate Bosch ignitors.
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Mike S. 79 928 Racer 427ci 32v 640WHP Last edited by Barbapapa; 07-31-2009 at 12:32 PM.. Reason: intake size corrected |
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07-30-2009, 01:37 PM
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Join Date: Mar 2007
Location: Castle Rock, COLORADO
Posts: 488
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Thats AWESOME!!! Congrats!!!
How about some pics?
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Dave 82 928 Weissach #14 |
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07-30-2009, 02:18 PM
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Exactly, let's see this beast!
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD** 
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07-30-2009, 02:25 PM
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Location: San Diego
Posts: 41
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This Thread.....
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07-30-2009, 02:27 PM
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Moderator
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...Is Useless...
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
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07-30-2009, 02:27 PM
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Join Date: Jan 2008
Location: Sydney, Down Under
Posts: 228
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Very nice Mike! Good to see you so happy with the results after all the effort and time. I followed all your threads on RL over the last few years and was wondering how your motor turned out - stunning result!
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Various manual S4's |
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07-30-2009, 02:33 PM
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Join Date: Jun 2008
Posts: 21
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Without Pics...
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89' 928S4 Meteor Grey auto 86.5' 928S Meteor Grey auto(building engine after TBF) 85.5' 944 NA 5 speed(Now daughters car) 80' 928 Black 5 speed SOLD 79' 928 Guards Red auto SOLD |
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07-30-2009, 02:38 PM
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Join Date: May 2008
Posts: 35
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Talk about a BEAST!!!!
CONGRATS MIKE!! I know you have to be beyond elated getting those results after all of your hard work!
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David Roberts 85 928S Euro 5-Speed "Supercharged by 928 Specialists" 16V Prototype 928 Owners Club Member/Co-Founder |
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07-30-2009, 02:54 PM
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Freiherr
Join Date: Dec 2003
Location: New Orleans
Posts: 1,884
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Congrats, Mike!!
That thing must be a hoot at RA!!!
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Abby Normal Last edited by Red Baron; 07-30-2009 at 03:26 PM.. |
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07-30-2009, 03:23 PM
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Freiherr
Join Date: Dec 2003
Location: New Orleans
Posts: 1,884
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Abby Normal |
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07-30-2009, 03:58 PM
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Thanks for the link Red. That was AMAZING !!! It must have been quite a rush just to stand there with the camera.
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07-30-2009, 04:16 PM
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Screenshot of Engine from Vid
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
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07-30-2009, 04:19 PM
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1981 Porsche 928 "Euro" Auto Gunsmoke Metallic Flat - Black Interior 1983 Porsche 928S "US" Auto Light Bronze (Copper) Metallic - Brown Interior **SOLD**
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07-30-2009, 04:21 PM
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Location: Atlanta
Posts: 305
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Sharp eye Abby!
For that video I removed the airbox lid and held a flashlight in one hand, camera in the other. The inlet is pretty straight and I wondered if I'd learn anything. The holy grail video would have been seeing inside the cylinder but the valves appear as being closed. At least we now know what the injector flow looks like. Those injectors are a fairly narrow spray pattern and they point at the valves pretty well. You can see some pooling on the walls at low rpms which implies that injector placement might be more important than I realised. Anyway, that's all I can learn from that, it was scary so it would be nice to learn something, anything 
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Mike S. 79 928 Racer 427ci 32v 640WHP |
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07-30-2009, 04:43 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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W o w !
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US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. |
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07-30-2009, 05:16 PM
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Location: South of Heaven
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I'm curious how much it cost to build.
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07-30-2009, 07:13 PM
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Location: San Diego
Posts: 41
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holy shiz
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07-30-2009, 07:58 PM
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Freiherr
Join Date: Dec 2003
Location: New Orleans
Posts: 1,884
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Quote:
Absolutely incredible work on that engine, and having seen how well the chassis is sorted, I know that thing is going to be a terror at RA. Shoot us some video please if possible because I'd love to hear it making the hill up turn 1 and screaming into 10a. Great stuff, Bro!
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Abby Normal |
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07-30-2009, 08:30 PM
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